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libmng_pixels.c

/* ************************************************************************** */
/* *             For conditions of distribution and use,                    * */
/* *                see copyright notice in libmng.h                        * */
/* ************************************************************************** */
/* *                                                                        * */
/* * project   : libmng                                                     * */
/* * file      : libmng_pixels.c           copyright (c) 2000-2004 G.Juyn   * */
/* * version   : 1.0.9                                                      * */
/* *                                                                        * */
/* * purpose   : Pixel-row management routines (implementation)             * */
/* *                                                                        * */
/* * author    : G.Juyn                                                     * */
/* *                                                                        * */
/* * comment   : implementation of the pixel-row management routines        * */
/* *                                                                        * */
/* *             the dual alpha-composing for RGBA/BGRA/etc output-canvas'  * */
/* *             is based on the Note on Compositing chapter of the         * */
/* *             DOH-3 draft, noted to me by Adam M. Costello               * */
/* *                                                                        * */
/* * changes   : 0.5.1 - 05/08/2000 - G.Juyn                                * */
/* *             - changed strict-ANSI stuff                                * */
/* *             0.5.1 - 05/11/2000 - G.Juyn                                * */
/* *             - added callback error-reporting support                   * */
/* *             0.5.1 - 05/12/2000 - G.Juyn                                * */
/* *             - changed trace to macro for callback error-reporting      * */
/* *                                                                        * */
/* *             0.5.2 - 05/22/2000 - G.Juyn                                * */
/* *             - added JNG support                                        * */
/* *             0.5.2 - 05/30/2000 - G.Juyn                                * */
/* *             - fixed minor bugs 16-bit pixel-handling                   * */
/* *             - added delta-image row-processing routines                * */
/* *             0.5.2 - 06/02/2000 - G.Juyn                                * */
/* *             - fixed endian support (hopefully)                         * */
/* *             0.5.2 - 06/03/2000 - G.Juyn                                * */
/* *             - fixed makeup for Linux gcc compile                       * */
/* *             0.5.2 - 06/05/2000 - G.Juyn                                * */
/* *             - implemented app bkgd restore routines                    * */
/* *             - implemented RGBA8, ARGB8, BGRA8 & ABGR8 display routines * */
/* *             - added support for RGB8_A8 canvasstyle                    * */
/* *             0.5.2 - 06/09/2000 - G.Juyn                                * */
/* *             - fixed alpha-handling for alpha canvasstyles              * */
/* *                                                                        * */
/* *             0.5.3 - 06/16/2000 - G.Juyn                                * */
/* *             - changed progressive-display processing                   * */
/* *             0.5.3 - 06/17/2000 - G.Juyn                                * */
/* *             - changed to support delta-images                          * */
/* *             - optimized some store_xxx routines                        * */
/* *             0.5.3 - 06/20/2000 - G.Juyn                                * */
/* *             - fixed nasty bug with embedded PNG after delta-image      * */
/* *             0.5.3 - 06/24/2000 - G.Juyn                                * */
/* *             - fixed problem with 16-bit GA format                      * */
/* *             0.5.3 - 06/25/2000 - G.Juyn                                * */
/* *             - fixed problem with cheap transparency for 4-bit gray     * */
/* *             - fixed display_xxxx routines for interlaced images        * */
/* *             0.5.3 - 06/28/2000 - G.Juyn                                * */
/* *             - fixed compiler-warning for non-initialized iB variable   * */
/* *                                                                        * */
/* *             0.9.1 - 07/05/2000 - G.Juyn                                * */
/* *             - fixed mandatory BACK color to be opaque                  * */
/* *                                                                        * */
/* *             0.9.2 - 07/31/2000 - G.Juyn                                * */
/* *             - B110547 - fixed bug in interlace code                    * */
/* *             0.9.2 - 08/05/2000 - G.Juyn                                * */
/* *             - changed file-prefixes                                    * */
/* *                                                                        * */
/* *             0.9.3 - 08/20/2000 - G.Juyn                                * */
/* *             - fixed app-supplied background restore                    * */
/* *             0.9.3 - 08/26/2000 - G.Juyn                                * */
/* *             - added MAGN chunk                                         * */
/* *             0.9.3 - 09/07/2000 - G.Juyn                                * */
/* *             - added support for new filter_types                       * */
/* *             0.9.3 - 09/30/2000 - G.Juyn                                * */
/* *             - fixed MAGN rounding errors (thanks Matthias!)            * */
/* *             0.9.3 - 10/10/2000 - G.Juyn                                * */
/* *             - fixed alpha-blending for RGBA canvasstyle                * */
/* *             0.9.3 - 10/11/2000 - G.Juyn                                * */
/* *             - fixed alpha-blending for other alpha-canvasstyles        * */
/* *             0.9.3 - 10/16/2000 - G.Juyn                                * */
/* *             - added optional support for bKGD for PNG images           * */
/* *             - added support for JDAA                                   * */
/* *             0.9.3 - 10/17/2000 - G.Juyn                                * */
/* *             - fixed support for bKGD                                   * */
/* *             0.9.3 - 10/19/2000 - G.Juyn                                * */
/* *             - implemented delayed delta-processing                     * */
/* *             0.9.3 - 10/28/2000 - G.Juyn                                * */
/* *             - fixed tRNS processing for gray-image < 8-bits            * */
/* *                                                                        * */
/* *             0.9.4 - 12/16/2000 - G.Juyn                                * */
/* *             - fixed mixup of data- & function-pointers (thanks Dimitri)* */
/* *             0.9.4 -  1/18/2001 - G.Juyn                                * */
/* *             - removed "old" MAGN methods 3 & 4                         * */
/* *             - added "new" MAGN methods 3, 4 & 5                        * */
/* *             - removed test filter-methods 1 & 65                       * */
/* *                                                                        * */
/* *             1.0.1 - 04/21/2001 - G.Juyn (code by G.Kelly)              * */
/* *             - added BGRA8 canvas with premultiplied alpha              * */
/* *             1.0.1 - 04/25/2001 - G.Juyn                                * */
/* *             - moved mng_clear_cms to libmng_cms                        * */
/* *                                                                        * */
/* *             1.0.2 - 06/25/2001 - G.Juyn                                * */
/* *             - added option to turn off progressive refresh             * */
/* *                                                                        * */
/* *             1.0.4 - 11/04/2001 - G.Juyn                                * */
/* *             - fixed possible compile-problem in cleanup_rowproc        * */
/* *             1.0.4 - 06/22/2002 - G.Juyn                                * */
/* *             - B558212 - off by one error                               * */
/* *             - MNG subimage alpha composite wrong for rgba8 images      * */
/* *                                                                        * */
/* *             1.0.5 - 08/07/2002 - G.Juyn                                * */
/* *             - added test-option for PNG filter method 193 (=no filter) * */
/* *             1.0.5 - 08/15/2002 - G.Juyn                                * */
/* *             - completed PROM support                                   * */
/* *             - completed delta-image support                            * */
/* *             1.0.5 - 08/16/2002 - G.Juyn                                * */
/* *             - completed MAGN support (16-bit functions)                * */
/* *             1.0.5 - 08/19/2002 - G.Juyn                                * */
/* *             - B597134 - libmng pollutes the linker namespace           * */
/* *             1.0.5 - 09/19/2002 - G.Juyn                                * */
/* *             - optimized restore-background for bKGD cases              * */
/* *             1.0.5 - 09/20/2002 - G.Juyn                                * */
/* *             - finished support for BACK image & tiling                 * */
/* *             1.0.5 - 09/22/2002 - G.Juyn                                * */
/* *             - added bgrx8 canvas (filler byte)                         * */
/* *             1.0.5 - 09/23/2002 - G.Juyn                                * */
/* *             - added compose over/under routines for PAST processing    * */
/* *             - added flip & tile routines for PAST processing           * */
/* *                                                                        * */
/* *             1.0.6 - 03/09/2003 - G.Juyn                                * */
/* *             - hiding 12-bit JPEG stuff                                 * */
/* *             1.0.6 - 05/11/2003 - Glenn RP                              * */
/* *             - added size-optimization COMPOSE routine usage            * */
/* *             1.0.6 - 05/11/2003 - G. Juyn                               * */
/* *             - added conditionals around canvas update routines         * */
/* *             1.0.6 - 05/25/2003 - Glenn RP                              * */
/* *             - added size-optimization DIV255B8 routine usage           * */
/* *             1.0.6 - 06/09/2003 - G. R-P                                * */
/* *             - added conditionals around 8-bit magn routines            * */
/* *             1.0.6 - 07/07/2003 - G. R-P                                * */
/* *             - removed conditionals around 8-bit magn routines          * */
/* *             - added MNG_NO_16BIT_SUPPORT and MNG_NO_DELTA_PNG          * */
/* *               conditionals                                             * */
/* *             - reversed many loops to use decrementing counter          * */
/* *             - combined init functions                                  * */
/* *             - converted some switches to array references              * */
/* *             1.0.6 - 07/29/2003 - G.Juyn                                * */
/* *             - fixed duplicate for-loop                                 * */
/* *             1.0.6 - 07/29/2003 - G.R-P                                 * */
/* *             - added SKIPCHUNK conditionals around PAST chunk support   * */
/* *             - fixed "FOOTPRINT_COMPOSEIV" typo (now "FOOTPRINT_DIV")   * */
/* *             1.0.6 - 08/17/2003 - G.R-P                                 * */
/* *             - added more conditionals around "promote" functions       * */
/* *                                                                        * */
/* *             1.0.7 - 11/27/2003 - R.A                                   * */
/* *             - added CANVAS_RGB565 and CANVAS_BGR565                    * */
/* *             1.0.7 - 12/06/2003 - R.A                                   * */
/* *             - added CANVAS_RGBA565 and CANVAS_BGRA565                  * */
/* *             1.0.7 - 01/25/2004 - J.S                                   * */
/* *             - added premultiplied alpha canvas' for RGBA, ARGB, ABGR   * */
/* *             1.0.7 - 03/08/2004 - G.R-P                                 * */
/* *             - added more conditionals around 16-bit-supporting code    * */
/* *             1.0.7 - 03/09/2004 - G.Juyn                                * */
/* *             - fixed bug in promote_g8_g8 with 16bit support off        * */
/* *             1.0.7 - 03/09/2004 - G.R-P                                 * */
/* *             - more optimizations with 16bit support off                * */
/* *             1.0.7 - 03/10/2004 - G.Juyn                                * */
/* *             - fixed some warnings for 16bit optimizations              * */
/* *             1.0.7 - 03/21/2004 - G.Juyn                                * */
/* *             - fixed some 64-bit platform compiler warnings             * */
/* *                                                                        * */
/* *             1.0.8 - 06/20/2004 - G.Juyn                                * */
/* *             - some speed optimizations (thanks to John Stiles)         * */
/* *             1.0.8 - 08/01/2004 - G.Juyn                                * */
/* *             - added support for 3+byte pixelsize for JPEG's            * */
/* *                                                                        * */
/* *             1.0.9 - 10/10/2004 - G.R-P.                                * */
/* *             - added MNG_NO_1_2_4BIT_SUPPORT                            * */
/* *             1.0.9 - 10/14/2004 - G.Juyn                                * */
/* *             - added bgr565_a8 canvas-style (thanks to J. Elvander)     * */
/* *             1.0.9 - 12/05/2004 - G.Juyn                                * */
/* *             - added LITTLEENDIAN/BIGENDIAN fixtures (thanks J.Stiles)  * */
/* *             - fixed MNG_NO_1_2_4BIT_SUPPORT for TBBN1G04.PNG           * */
/* *             1.0.9 - 12/31/2004 - G.R-P.                                * */
/* *             - fixed warnings about C++ style (//) comments             * */
/* *                                                                        * */
/* ************************************************************************** */

#include "libmng.h"
#include "libmng_data.h"
#include "libmng_error.h"
#include "libmng_trace.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "libmng_objects.h"
#include "libmng_object_prc.h"
#include "libmng_memory.h"
#include "libmng_cms.h"
#include "libmng_filter.h"
#include "libmng_pixels.h"

#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A                      /* force ANSI-C */
#endif

/* ************************************************************************** */

#ifdef MNG_INCLUDE_DISPLAY_PROCS

/* TODO: magnification & canvas-positioning/-clipping */

/* TODO: major optimization of pixel-loops by using assembler (?) */

/* ************************************************************************** */
/* *                                                                        * */
/* * Interlace tables                                                       * */
/* *                                                                        * */
/* ************************************************************************** */

MNG_LOCAL mng_uint32 const interlace_row      [7] = { 0, 0, 4, 0, 2, 0, 1 };
MNG_LOCAL mng_uint32 const interlace_rowskip  [7] = { 8, 8, 8, 4, 4, 2, 2 };
MNG_LOCAL mng_uint32 const interlace_col      [7] = { 0, 4, 0, 2, 0, 1, 0 };
MNG_LOCAL mng_uint32 const interlace_colskip  [7] = { 8, 8, 4, 4, 2, 2, 1 };
MNG_LOCAL mng_uint32 const interlace_roundoff [7] = { 7, 7, 3, 3, 1, 1, 0 };
MNG_LOCAL mng_uint32 const interlace_divider  [7] = { 3, 3, 2, 2, 1, 1, 0 };

/* ************************************************************************** */
/* *                                                                        * */
/* * Alpha composing macros                                                 * */
/* * the code below is slightly modified from the libpng package            * */
/* * the original was last optimized by Greg Roelofs & Mark Adler           * */
/* *                                                                        * */
/* ************************************************************************** */

#define MNG_COMPOSE8(RET,FG,ALPHA,BG) {                                    \
       mng_uint16 iH = (mng_uint16)((mng_uint16)(FG) * (mng_uint16)(ALPHA) \
                        + (mng_uint16)(BG)*(mng_uint16)(255 -              \
                          (mng_uint16)(ALPHA)) + (mng_uint16)128);         \
       (RET) = (mng_uint8)((iH + (iH >> 8)) >> 8); }

#define MNG_COMPOSE16(RET,FG,ALPHA,BG) {                                   \
       mng_uint32 iH = (mng_uint32)((mng_uint32)(FG) * (mng_uint32)(ALPHA) \
                        + (mng_uint32)(BG)*(mng_uint32)(65535L -           \
                          (mng_uint32)(ALPHA)) + (mng_uint32)32768L);      \
       (RET) = (mng_uint16)((iH + (iH >> 16)) >> 16); }

/* ************************************************************************** */
/* *                                                                        * */
/* * Alpha blending macros                                                  * */
/* * this code is based on Adam Costello's "Note on Compositing" from the   * */
/* * mng-list which gives the following formula:                            * */
/* *                                                                        * */
/* * top pixel       = (Rt, Gt, Bt, At)                                     * */
/* * bottom pixel    = (Rb, Gb, Bb, Ab)                                     * */
/* * composite pixel = (Rc, Gc, Bc, Ac)                                     * */
/* *                                                                        * */
/* * all values in the range 0..1                                           * */
/* *                                                                        * */
/* * Ac = 1 - (1 - At)(1 - Ab)                                              * */
/* * s = At / Ac                                                            * */
/* * t = (1 - At) Ab / Ac                                                   * */
/* * Rc = s Rt + t Rb                                                       * */
/* * Gc = s Gt + t Gb                                                       * */
/* * Bc = s Bt + t Bb                                                       * */
/* *                                                                        * */
/* * (I just hope I coded it correctly in integer arithmetic...)            * */
/* *                                                                        * */
/* ************************************************************************** */

#define MNG_BLEND8(RT, GT, BT, AT, RB, GB, BB, AB, RC, GC, BC, AC) {         \
       mng_uint32 S, T;                                                      \
       (AC) = (mng_uint8)((mng_uint32)255 -                                  \
                          ((((mng_uint32)255 - (mng_uint32)(AT)) *           \
                            ((mng_uint32)255 - (mng_uint32)(AB))   ) >> 8)); \
       S    = (mng_uint32)(((mng_uint32)(AT) << 8) /                         \
                           (mng_uint32)(AC));                                \
       T    = (mng_uint32)(((mng_uint32)255 - (mng_uint32)(AT)) *            \
                            (mng_uint32)(AB) / (mng_uint32)(AC));            \
       (RC) = (mng_uint8)((S * (mng_uint32)(RT) +                            \
                           T * (mng_uint32)(RB) + (mng_uint32)127) >> 8);    \
       (GC) = (mng_uint8)((S * (mng_uint32)(GT) +                            \
                           T * (mng_uint32)(GB) + (mng_uint32)127) >> 8);    \
       (BC) = (mng_uint8)((S * (mng_uint32)(BT) +                            \
                           T * (mng_uint32)(BB) + (mng_uint32)127) >> 8); }

#define MNG_BLEND16(RT, GT, BT, AT, RB, GB, BB, AB, RC, GC, BC, AC) {            \
       mng_uint32 S, T;                                                          \
       (AC) = (mng_uint16)((mng_uint32)65535 -                                   \
                           ((((mng_uint32)65535 - (mng_uint32)(AT)) *            \
                             ((mng_uint32)65535 - (mng_uint32)(AB))   ) >> 16)); \
       S    = (mng_uint32)(((mng_uint32)(AT) << 16) /                            \
                            (mng_uint32)(AC));                                   \
       T    = (mng_uint32)(((mng_uint32)65535 - (mng_uint32)(AT)) *              \
                            (mng_uint32)(AB) / (mng_uint32)(AC));                \
       (RC) = (mng_uint16)((S * (mng_uint32)(RT) +                               \
                            T * (mng_uint32)(RB) + (mng_uint32)32767) >> 16);    \
       (GC) = (mng_uint16)((S * (mng_uint32)(GT) +                               \
                            T * (mng_uint32)(GB) + (mng_uint32)32767) >> 16);    \
       (BC) = (mng_uint16)((S * (mng_uint32)(BT) +                               \
                            T * (mng_uint32)(BB) + (mng_uint32)32767) >> 16); }

/* ************************************************************************** */

/* note a good optimizing compiler will optimize this */
#define DIV255B8(x) (mng_uint8)(((x) + 127) / 255)
#define DIV255B16(x) (mng_uint16)(((x) + 32767) / 65535)

/* ************************************************************************** */
/* *                                                                        * */
/* * Progressive display check - checks to see if progressive display is    * */
/* * in order & indicates so                                                * */
/* *                                                                        * */
/* * The routine is called after a call to one of the display_xxx routines  * */
/* * if appropriate                                                         * */
/* *                                                                        * */
/* * The refresh is warrented in the read_chunk routine (mng_read.c)        * */
/* * and only during read&display processing, since there's not much point  * */
/* * doing it from memory!                                                  * */
/* *                                                                        * */
/* ************************************************************************** */

mng_retcode mng_display_progressive_check (mng_datap pData)
{
  if ((pData->bDoProgressive) &&       /* need progressive display? */
      ((pData->eImagetype != mng_it_mng) || (pData->iDataheight > 300)) &&
      (pData->iDestb - pData->iDestt > 50) && (!pData->pCurraniobj))
  {
    mng_int32 iC = pData->iRow + pData->iDestt - pData->iSourcet;

    if (iC % 20 == 0)                  /* every 20th line */
      pData->bNeedrefresh = MNG_TRUE;

  }

  return MNG_NOERROR;
}

/* ************************************************************************** */
/* *                                                                        * */
/* * Display routines - convert rowdata (which is already color-corrected)  * */
/* * to the output canvas, respecting the opacity information               * */
/* *                                                                        * */
/* ************************************************************************** */

MNG_LOCAL void check_update_region (mng_datap pData)
{                                      /* determine actual canvas row */
  mng_int32 iRow = pData->iRow + pData->iDestt - pData->iSourcet;
                                       /* check for change in update-region */
  if ((pData->iDestl < (mng_int32)pData->iUpdateleft) || (pData->iUpdateright == 0))
    pData->iUpdateleft   = pData->iDestl;

  if (pData->iDestr > (mng_int32)pData->iUpdateright)
    pData->iUpdateright  = pData->iDestr;

  if ((iRow < (mng_int32)pData->iUpdatetop) || (pData->iUpdatebottom == 0))
    pData->iUpdatetop    = iRow;

  if (iRow+1 > (mng_int32)pData->iUpdatebottom)
    pData->iUpdatebottom = iRow+1;

  return;
}

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGB8
mng_retcode mng_display_rgb8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
#else
  mng_uint16 iFGg16;
  mng_uint16 iBGg16;
#endif
#endif
  mng_uint8  iA8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol * 3) + (pData->iDestl * 3);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *(pDataline+4);

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *(pDataline+2);

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA16 = mng_get_uint16 (pDataline+6);

          if (iA16)                    /* any opacity at all ? */
          {
            if (iA16 == 0xFFFF)        /* fully opaque ? */
            {                          /* scale down by dropping the LSB */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *(pDataline+4);
            }
            else
            {                          /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
            int i;
            for (i=2; i >= 0; i--)
            {
              iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
              iBGg16 = (mng_uint16)(*(pScanline+i));
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
                                       /* and return the composed values */
              *(pScanline+i) = (mng_uint8)(iFGg16 >> 8);
            }
#else
              iFGr16 = mng_get_uint16 (pDataline  );
              iFGg16 = mng_get_uint16 (pDataline+2);
              iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
              iBGr16 = (mng_uint16)(*pScanline    );
              iBGg16 = (mng_uint16)(*(pScanline+1));
              iBGb16 = (mng_uint16)(*(pScanline+2));
              iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
              iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
              MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
              MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                       /* and return the composed values */
              *pScanline     = (mng_uint8)(iFGr16 >> 8);
              *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
              *(pScanline+2) = (mng_uint8)(iFGb16 >> 8);
#endif
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */

          if (iA8)                     /* any opacity at all ? */
          {
            if (iA8 == 0xFF)           /* fully opaque ? */
            {                          /* then simply copy the values */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *(pDataline+2);
            }
            else
            {                          /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i), *(pDataline+i), iA8, *(pScanline+i));
              }
#else
              MNG_COMPOSE8 (*pScanline,     *pDataline,     iA8, *pScanline    );
              MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iA8, *(pScanline+1));
              MNG_COMPOSE8 (*(pScanline+2), *(pDataline+2), iA8, *(pScanline+2));
#endif
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGB8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGBA8
mng_retcode mng_display_rgba8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
#else
  mng_uint16 iFGg16;
#endif
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *(pDataline+4);
          *(pScanline+3) = *(pDataline+6);

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *(pDataline+2);
          *(pScanline+3) = *(pDataline+3);

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*(pScanline+3));
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *(pDataline+4);
              *(pScanline+3) = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
                iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
                iBGg16 = (mng_uint16)(*(pScanline+i));
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                                       /* and return the composed values */
                *(pScanline+i) = (mng_uint8)(iFGg16 >> 8);
                                       /* alpha remains fully opaque !!! */
              }
#else
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)(*pScanline    );
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*(pScanline+2));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iFGr16 >> 8);
                *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iFGb16 >> 8);
                                       /* alpha remains fully opaque !!! */
#endif
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)(*pScanline    );
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*(pScanline+2));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iCr16 >> 8);
                *(pScanline+1) = (mng_uint8)(iCg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iCb16 >> 8);
                *(pScanline+3) = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *(pScanline+3);

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *(pDataline+2);
              *(pScanline+3) = *(pDataline+3);
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i), *(pDataline+i), iFGa8, *(pScanline+i));
              }
#else
                MNG_COMPOSE8 (*pScanline,     *pDataline,     iFGa8, *pScanline    );
                MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iFGa8, *(pScanline+1));
                MNG_COMPOSE8 (*(pScanline+2), *(pDataline+2), iFGa8, *(pScanline+2));
#endif
                                       /* alpha remains fully opaque !!! */
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline, *(pDataline+1), *(pDataline+2), iFGa8,
                            *pScanline, *(pScanline+1), *(pScanline+2), iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *pScanline     = iCr8;
                *(pScanline+1) = iCg8;
                *(pScanline+2) = iCb8;
                *(pScanline+3) = iCa8;
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGBA8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGBA8_PM
mng_retcode mng_display_rgba8_pm (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint32 s, t;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA8_PM, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
              if ((s = pDataline[6]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
              pScanline[0] = pDataline[0];
              pScanline[1] = pDataline[2];
                  pScanline[2] = pDataline[4];
              pScanline[3] = 255;
                  }
                  else
                  {
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              int i;
              for (i=2; i >= 0; i--)
              {
                pScanline[2-i] = DIV255B8(s * pDataline[4-i-i]);
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[0]);
              pScanline[1] = DIV255B8(s * pDataline[2]);
              pScanline[2] = DIV255B8(s * pDataline[4]);
#endif           
              pScanline[3] = (mng_uint8)s;
                  }
              }
          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values and premultiply */
              if ((s = pDataline[3]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
#ifdef MNG_BIGENDIAN_SUPPORTED
              *(mng_uint32*)pScanline = (*(mng_uint32*)pDataline) | 0x000000FF;
#else
              pScanline[0] = pDataline[0];
              pScanline[1] = pDataline[1];
                  pScanline[2] = pDataline[2];
              pScanline[3] = 255;
#endif
                  }
                  else
                  {
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              int i;
              for (i=2; i >= 0; i--)
              {
                pScanline[2-i] = DIV255B8(s * pDataline[2-i]);
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[0]);
              pScanline[1] = DIV255B8(s * pDataline[1]);
                  pScanline[2] = DIV255B8(s * pDataline[2]);
#endif
              pScanline[3] = (mng_uint8)s;
                  }
              }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          if ((s = pDataline[6]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if (s == 255)
            {                          /* plain copy it */
              pScanline[0] = pDataline[0];
              pScanline[1] = pDataline[2];
              pScanline[2] = pDataline[4];
              pScanline[3] = 255;
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[2-i] = DIV255B8(s * pDataline[4-i-i] + t *
                     pScanline[2-i]);
                }
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[0] + t * pScanline[0]);
              pScanline[1] = DIV255B8(s * pDataline[2] + t * pScanline[1]);
                    pScanline[2] = DIV255B8(s * pDataline[4] + t * pScanline[2]);
#endif
              pScanline[3] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[3])));
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          if ((s = pDataline[3]) != 0) /* any opacity at all ? */
          {                            /* fully opaque ? */
            if (s == 255)
            {                          /* then simply copy the values */
#ifdef MNG_BIGENDIAN_SUPPORTED
              *(mng_uint32*)pScanline = (*(mng_uint32*)pDataline) | 0x000000FF;
#else
              pScanline[0] = pDataline[0];
              pScanline[1] = pDataline[1];
              pScanline[2] = pDataline[2];
              pScanline[3] = 255;
#endif
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[2-i] = DIV255B8(s * pDataline[2-i] + t *
                     pScanline[2-i]);
                }
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[0] + t * pScanline[0]);
              pScanline[1] = DIV255B8(s * pDataline[1] + t * pScanline[1]);
                    pScanline[2] = DIV255B8(s * pDataline[2] + t * pScanline[2]);
#endif
              pScanline[3] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[3])));
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA8_PM, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGBA8_PM */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_ARGB8
mng_retcode mng_display_argb8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
#else
  mng_uint16 iFGg16;
#endif
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif  
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ARGB8, MNG_LC_START);
#endif

                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *(pDataline+6);
          *(pScanline+1) = *pDataline;
          *(pScanline+2) = *(pDataline+2);
          *(pScanline+3) = *(pDataline+4);

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *(pDataline+3);
          *(pScanline+1) = *pDataline;
          *(pScanline+2) = *(pDataline+1);
          *(pScanline+3) = *(pDataline+2);

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*pScanline);
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *pScanline     = *(pDataline+6);
              *(pScanline+1) = *pDataline;
              *(pScanline+2) = *(pDataline+2);
              *(pScanline+3) = *(pDataline+4);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
                iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
                iBGg16 = (mng_uint16)(*(pScanline+i+1));
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                                       /* and return the composed values */
                                       /* alpha remains fully opaque !!! */
                *(pScanline+i+1) = (mng_uint8)(iFGg16 >> 8);
              }
#else
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+1));
                iBGg16 = (mng_uint16)(*(pScanline+2));
                iBGb16 = (mng_uint16)(*(pScanline+3));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                                       /* alpha remains fully opaque !!! */
                *(pScanline+1) = (mng_uint8)(iFGr16 >> 8);
                *(pScanline+2) = (mng_uint8)(iFGg16 >> 8);
                *(pScanline+3) = (mng_uint8)(iFGb16 >> 8);
#endif
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+1));
                iBGg16 = (mng_uint16)(*(pScanline+2));
                iBGb16 = (mng_uint16)(*(pScanline+3));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iCa16 >> 8);
                *(pScanline+1) = (mng_uint8)(iCr16 >> 8);
                *(pScanline+2) = (mng_uint8)(iCg16 >> 8);
                *(pScanline+3) = (mng_uint8)(iCb16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *pScanline;

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *pScanline     = *(pDataline+3);
              *(pScanline+1) = *pDataline;
              *(pScanline+2) = *(pDataline+1);
              *(pScanline+3) = *(pDataline+2);
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do simple alpha composing */
                                       /* alpha itself remains fully opaque !!! */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i+1), *(pDataline+i), iFGa8, *(pScanline+i+1));
              }
#else
                MNG_COMPOSE8 (*(pScanline+1), *pDataline,     iFGa8, *(pScanline+1));
                MNG_COMPOSE8 (*(pScanline+2), *(pDataline+1), iFGa8, *(pScanline+2));
                MNG_COMPOSE8 (*(pScanline+3), *(pDataline+2), iFGa8, *(pScanline+3));
#endif
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline,     *(pDataline+1), *(pDataline+2), iFGa8,
                            *(pScanline+1), *(pScanline+2), *(pScanline+3), iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *pScanline     = iCa8;
                *(pScanline+1) = iCr8;
                *(pScanline+2) = iCg8;
                *(pScanline+3) = iCb8;
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ARGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_ARGB8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_ARGB8_PM
mng_retcode mng_display_argb8_pm (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint32 s, t;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ARGB8_PM, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
              if ((s = pDataline[6]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
              pScanline[0] = 255;
              pScanline[1] = pDataline[0];
              pScanline[2] = pDataline[2];
                  pScanline[3] = pDataline[4];
                  }
                  else
                  {
              pScanline[0] = (mng_uint8)s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[3-i] = DIV255B8(s * pDataline[4-i-i]);
                }
              }  
#else
              pScanline[1] = DIV255B8(s * pDataline[0]);
              pScanline[2] = DIV255B8(s * pDataline[2]);
              pScanline[3] = DIV255B8(s * pDataline[4]);
#endif           
                  }
              }
          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values and premultiply */
              if ((s = pDataline[3]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
              pScanline[0] = 255;
              pScanline[1] = pDataline[0];
              pScanline[2] = pDataline[1];
                  pScanline[3] = pDataline[2];
                  }
                  else
                  {
              pScanline[0] = (mng_uint8)s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[3-i] = DIV255B8(s * pDataline[2-i]);
                }
              }
#else
              pScanline[1] = DIV255B8(s * pDataline[0]);
              pScanline[2] = DIV255B8(s * pDataline[1]);
                  pScanline[3] = DIV255B8(s * pDataline[2]);
#endif
                  }
              }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          if ((s = pDataline[6]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if (s == 255)
            {                          /* plain copy it */
              pScanline[0] = 255;
              pScanline[1] = pDataline[0];
              pScanline[2] = pDataline[2];
              pScanline[3] = pDataline[4];
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
              pScanline[0] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[0])));
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[3-i] = DIV255B8(s * pDataline[4-i-i] + t *
                     pScanline[3-i]);
                }
              }
#else
              pScanline[1] = DIV255B8(s * pDataline[0] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[2] + t * pScanline[2]);
                    pScanline[3] = DIV255B8(s * pDataline[4] + t * pScanline[3]);
#endif
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          if ((s = pDataline[3]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque ? */
            if (s == 255)
            {                          /* then simply copy the values */
              pScanline[0] = 255;
              pScanline[1] = pDataline[0];
              pScanline[2] = pDataline[1];
              pScanline[3] = pDataline[2];
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
              pScanline[0] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[0])));
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[3-i] = DIV255B8(s * pDataline[2-i] + t *
                     pScanline[3-i]);
                }
              }
#else
              pScanline[1] = DIV255B8(s * pDataline[0] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[1] + t * pScanline[2]);
                    pScanline[3] = DIV255B8(s * pDataline[2] + t * pScanline[3]);
#endif
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ARGB8_PM, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_ARGB8_PM */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGB8_A8
mng_retcode mng_display_rgb8_a8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pAlphaline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
#else
  mng_uint16 iFGg16;
#endif
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8_A8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination rows */
    pScanline  = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                    pData->iRow + pData->iDestt -
                                                    pData->iSourcet);
    pAlphaline = (mng_uint8p)pData->fGetalphaline  (((mng_handle)pData),
                                                    pData->iRow + pData->iDestt -
                                                    pData->iSourcet);
                                       /* adjust destination rows starting-point */
    pScanline  = pScanline  + (pData->iCol * 3) + (pData->iDestl * 3);
    pAlphaline = pAlphaline + pData->iCol + pData->iDestl;

    pDataline  = pData->pRGBArow;      /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *(pDataline+4);
          *pAlphaline    = *(pDataline+6);

          pScanline  += (pData->iColinc * 3);
          pAlphaline += pData->iColinc;
          pDataline  += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *pDataline;
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *(pDataline+2);
          *pAlphaline    = *(pDataline+3);

          pScanline  += (pData->iColinc * 3);
          pAlphaline += pData->iColinc;
          pDataline  += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*pAlphaline);
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *(pDataline+4);
              *pAlphaline    = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
                iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
                iBGg16 = (mng_uint16)(*(pScanline+i));
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                                       /* and return the composed values */
                *(pScanline+i) = (mng_uint8)(iFGg16 >> 8);
                                       /* alpha remains fully opaque !!! */
              }
#else
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)(*pScanline    );
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*(pScanline+2));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iFGr16 >> 8);
                *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iFGb16 >> 8);
                                       /* alpha remains fully opaque !!! */
#endif
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)(*pScanline    );
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*(pScanline+2));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iCr16 >> 8);
                *(pScanline+1) = (mng_uint8)(iCg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iCb16 >> 8);
                *pAlphaline    = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline  += (pData->iColinc * 3);
          pAlphaline += pData->iColinc;
          pDataline  += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *pAlphaline;

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *pScanline     = *pDataline;
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *(pDataline+2);
              *pAlphaline    = *(pDataline+3);
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i), *(pDataline+i), iFGa8, *(pScanline+i));
              }
#else
                MNG_COMPOSE8 (*pScanline,     *pDataline,     iFGa8, *pScanline    );
                MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iFGa8, *(pScanline+1));
                MNG_COMPOSE8 (*(pScanline+2), *(pDataline+2), iFGa8, *(pScanline+2));
#endif
                                       /* alpha remains fully opaque !!! */
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline, *(pDataline+1), *(pDataline+2), iFGa8,
                            *pScanline, *(pScanline+1), *(pScanline+2), iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *pScanline     = iCr8;
                *(pScanline+1) = iCg8;
                *(pScanline+2) = iCb8;
                *pAlphaline    = iCa8;
              }
            }
          }

          pScanline  += (pData->iColinc * 3);
          pAlphaline += pData->iColinc;
          pDataline  += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8_A8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGB8_A8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGR8
mng_retcode mng_display_bgr8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
#else
  mng_uint16 iFGg16;
  mng_uint16 iBGg16;
#endif
#endif
  mng_uint8  iA8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol * 3) + (pData->iDestl * 3);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + (pData->iSourcel / pData->iColinc) * 8;
    else
#endif
      pDataline = pDataline + (pData->iSourcel / pData->iColinc) * 4;

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *(pDataline+4);
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *pDataline;

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *(pDataline+2);
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *pDataline;

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha value */
          iA16 = mng_get_uint16 (pDataline+6);

          if (iA16)                    /* any opacity at all ? */
          {
            if (iA16 == 0xFFFF)        /* fully opaque ? */
            {                          /* scale down by dropping the LSB */
              *pScanline     = *(pDataline+4);
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *pDataline;
            }
            else
            {                          /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
              iBGg16 = (mng_uint16)(*(pScanline+2-i));
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
                                       /* and return the composed values */
              *(pScanline+2-i) = (mng_uint8)(iFGg16 >> 8);
              }
#else
              iFGr16 = mng_get_uint16 (pDataline  );
              iFGg16 = mng_get_uint16 (pDataline+2);
              iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
              iBGr16 = (mng_uint16)(*(pScanline+2));
              iBGg16 = (mng_uint16)(*(pScanline+1));
              iBGb16 = (mng_uint16)(*pScanline    );
              iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
              iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
              MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
              MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                       /* and return the composed values */
              *pScanline     = (mng_uint8)(iFGb16 >> 8);
              *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
              *(pScanline+2) = (mng_uint8)(iFGr16 >> 8);
#endif
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */

          if (iA8)                     /* any opacity at all ? */
          {
            if (iA8 == 0xFF)           /* fully opaque ? */
            {                          /* then simply copy the values */
              *pScanline     = *(pDataline+2);
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *pDataline;
            }
            else
            {                          /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i), *(pDataline+2-i), iA8, *(pScanline+i));
              }
#else
              MNG_COMPOSE8 (*pScanline,     *(pDataline+2), iA8, *pScanline    );
              MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iA8, *(pScanline+1));
              MNG_COMPOSE8 (*(pScanline+2), *pDataline,     iA8, *(pScanline+2));
#endif
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGR8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGRX8
mng_retcode mng_display_bgrx8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
#else
  mng_uint16 iFGg16;
  mng_uint16 iBGg16;
#endif
#endif
  mng_uint8  iA8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRX8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + (pData->iSourcel / pData->iColinc) * 8;
    else
#endif
      pDataline = pDataline + (pData->iSourcel / pData->iColinc) * 4;

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *(pDataline+4);
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *pDataline;
          *(pScanline+3) = 0xFF;       /* filler byte */

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *(pDataline+2);
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *pDataline;
          *(pScanline+3) = 0xFF;       /* filler byte */

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha value */
          iA16 = mng_get_uint16 (pDataline+6);

          if (iA16)                    /* any opacity at all ? */
          {
            if (iA16 == 0xFFFF)        /* fully opaque ? */
            {                          /* scale down by dropping the LSB */
              *pScanline     = *(pDataline+4);
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *pDataline;
              *(pScanline+3) = 0xFF;   /* filler byte */
            }
            else
            {                          /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
              iBGg16 = (mng_uint16)(*(pScanline+2-i));
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
                                       /* and return the composed values */
              *(pScanline+2-i) = (mng_uint8)(iFGg16 >> 8);
              }
#else
              iFGr16 = mng_get_uint16 (pDataline  );
              iFGg16 = mng_get_uint16 (pDataline+2);
              iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
              iBGr16 = (mng_uint16)(*(pScanline+2));
              iBGg16 = (mng_uint16)(*(pScanline+1));
              iBGb16 = (mng_uint16)(*pScanline    );
              iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
              iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
              MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
              MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                       /* and return the composed values */
              *pScanline     = (mng_uint8)(iFGb16 >> 8);
              *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
              *(pScanline+2) = (mng_uint8)(iFGr16 >> 8);
#endif
              *(pScanline+3) = 0xFF;   /* filler byte */
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */

          if (iA8)                     /* any opacity at all ? */
          {
            if (iA8 == 0xFF)           /* fully opaque ? */
            {                          /* then simply copy the values */
              *pScanline     = *(pDataline+2);
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *pDataline;
              *(pScanline+3) = 0xFF;   /* filler byte */
            }
            else
            {                          /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
              MNG_COMPOSE8 (*(pScanline+i), *(pDataline+2-i), iA8, *(pScanline+i));
              }
#else
              MNG_COMPOSE8 (*pScanline,     *(pDataline+2), iA8, *pScanline    );
              MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iA8, *(pScanline+1));
              MNG_COMPOSE8 (*(pScanline+2), *pDataline,     iA8, *(pScanline+2));
#endif
              *(pScanline+3) = 0xFF;   /* filler byte */
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRX8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGRX8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGRA8
mng_retcode mng_display_bgra8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
#else
  mng_uint16 iFGg16;
#endif
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *(pDataline+4);
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *pDataline;
          *(pScanline+3) = *(pDataline+6);

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *(pDataline+2);
          *(pScanline+1) = *(pDataline+1);
          *(pScanline+2) = *pDataline;
          *(pScanline+3) = *(pDataline+3);

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*(pScanline+3));
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *pScanline     = *(pDataline+4);
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *pDataline;
              *(pScanline+3) = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
                iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
                iBGg16 = (mng_uint16)(*(pScanline+2-i));
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                                       /* and return the composed values */
                *(pScanline+2-i) = (mng_uint8)(iFGg16 >> 8);
                                       /* alpha remains fully opaque !!! */
              }
#else
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+2));
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*pScanline    );
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iFGb16 >> 8);
                *(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iFGr16 >> 8);
                                       /* alpha remains fully opaque !!! */
#endif
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+2));
                iBGg16 = (mng_uint16)(*(pScanline+1));
                iBGb16 = (mng_uint16)(*pScanline    );
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iCb16 >> 8);
                *(pScanline+1) = (mng_uint8)(iCg16 >> 8);
                *(pScanline+2) = (mng_uint8)(iCr16 >> 8);
                *(pScanline+3) = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *(pScanline+3);

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *pScanline     = *(pDataline+2);
              *(pScanline+1) = *(pDataline+1);
              *(pScanline+2) = *pDataline;
              *(pScanline+3) = *(pDataline+3);
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
                int i;
                for (i=2; i >= 0; i--)
                {
                MNG_COMPOSE8 (*(pScanline+i), *(pDataline+2-i), iFGa8, *(pScanline+i));
                }
#else
                MNG_COMPOSE8 (*pScanline,     *(pDataline+2), iFGa8, *pScanline    );
                MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iFGa8, *(pScanline+1));
                MNG_COMPOSE8 (*(pScanline+2), *pDataline,     iFGa8, *(pScanline+2));
#endif
                                       /* alpha remains fully opaque !!! */
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline,     *(pDataline+1), *(pDataline+2), iFGa8,
                            *(pScanline+2), *(pScanline+1), *pScanline,     iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *pScanline     = iCb8;
                *(pScanline+1) = iCg8;
                *(pScanline+2) = iCr8;
                *(pScanline+3) = iCa8;
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGRA8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGRA8_PM
mng_retcode mng_display_bgra8_pm (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint32 s, t;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA8PM, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          if ((s = pDataline[6]) == 0)
            *(mng_uint32*) pScanline = 0; /* set all components = 0 */
          else
          {
            if (s == 255)
            {
              pScanline[0] = pDataline[4];
              pScanline[1] = pDataline[2];
              pScanline[2] = pDataline[0];
              pScanline[3] = 255;
            }
            else
            {
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              int i;
              for (i=2; i >= 0; i--)
              {
                pScanline[i] = DIV255B8(s * pDataline[4-i-i]);
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[4]);
              pScanline[1] = DIV255B8(s * pDataline[2]);
              pScanline[2] = DIV255B8(s * pDataline[0]);
#endif           
              pScanline[3] = (mng_uint8)s;
            }
          }
          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values and premultiply */
          if ((s = pDataline[3]) == 0)
            *(mng_uint32*) pScanline = 0; /* set all components = 0 */
          else
          {
            if (s == 255)
            {
              pScanline[0] = pDataline[2];
              pScanline[1] = pDataline[1];
              pScanline[2] = pDataline[0];
              pScanline[3] = 255;
            }
            else
            {
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              int i;
              for (i=2; i >= 0; i--)
              {
                pScanline[i] = DIV255B8(s * pDataline[2-i]);
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[2]);
              pScanline[1] = DIV255B8(s * pDataline[1]);
              pScanline[2] = DIV255B8(s * pDataline[0]);
#endif
              pScanline[3] = (mng_uint8)s;
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          if ((s = pDataline[6]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if (s == 255)
            {                          /* plain copy it */
              pScanline[0] = pDataline[4];
              pScanline[1] = pDataline[2];
              pScanline[2] = pDataline[0];
              pScanline[3] = 255;
            }
            else
            {                          /* now blend (premultiplied) */
              t = 255 - s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i] = DIV255B8(s * pDataline[4-i-i] + t *
                     pScanline[i]);
                }
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[4] + t * pScanline[0]);
              pScanline[1] = DIV255B8(s * pDataline[2] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[0] + t * pScanline[2]);
#endif
              pScanline[3] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[3])));
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          if ((s = pDataline[3]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque ? */
            if (s == 255)
            {                          /* then simply copy the values */
              pScanline[0] = pDataline[2];
              pScanline[1] = pDataline[1];
              pScanline[2] = pDataline[0];
              pScanline[3] = 255;
            }
            else
            {                          /* now blend (premultiplied) */
              t = 255 - s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i] = DIV255B8(s * pDataline[2-i] + t *
                     pScanline[i]);
                }
              }
#else
              pScanline[0] = DIV255B8(s * pDataline[2] + t * pScanline[0]);
              pScanline[1] = DIV255B8(s * pDataline[1] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[0] + t * pScanline[2]);
#endif
              pScanline[3] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[3])));
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA8PM, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGRA8_PM */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_ABGR8
mng_retcode mng_display_abgr8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
  mng_uint16 iFGr16, iFGg16, iFGb16;
#else
  mng_uint16 iFGg16;
#endif
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ABGR8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *pScanline     = *(pDataline+6);
          *(pScanline+1) = *(pDataline+4);
          *(pScanline+2) = *(pDataline+2);
          *(pScanline+3) = *pDataline;

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *pScanline     = *(pDataline+3);
          *(pScanline+1) = *(pDataline+2);
          *(pScanline+2) = *(pDataline+1);
          *(pScanline+3) = *pDataline;

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*pScanline);
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *pScanline     = *(pDataline+6);
              *(pScanline+1) = *(pDataline+4);
              *(pScanline+2) = *(pDataline+2);
              *(pScanline+3) = *pDataline;
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
              int i;
              for (i=2; i >= 0; i--)
              {
                iFGg16 = mng_get_uint16 (pDataline+i+i);
                                       /* scale background up */
                iBGg16 = (mng_uint16)(*(pScanline+3-i));
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                                       /* now compose */
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                                       /* and return the composed values */
                                       /* alpha itself remains fully opaque !!! */
                *(pScanline+3-i) = (mng_uint8)(iFGg16 >> 8);
              }
#else
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+3));
                iBGg16 = (mng_uint16)(*(pScanline+2));
                iBGb16 = (mng_uint16)(*(pScanline+1));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                                       /* alpha itself remains fully opaque !!! */
                *(pScanline+1) = (mng_uint8)(iFGb16 >> 8);
                *(pScanline+2) = (mng_uint8)(iFGg16 >> 8);
                *(pScanline+3) = (mng_uint8)(iFGr16 >> 8);
#endif
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)(*(pScanline+3));
                iBGg16 = (mng_uint16)(*(pScanline+2));
                iBGb16 = (mng_uint16)(*(pScanline+1));
                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *pScanline     = (mng_uint8)(iCa16 >> 8);
                *(pScanline+1) = (mng_uint8)(iCb16 >> 8);
                *(pScanline+2) = (mng_uint8)(iCg16 >> 8);
                *(pScanline+3) = (mng_uint8)(iCr16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *pScanline;

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *pScanline     = *(pDataline+3);
              *(pScanline+1) = *(pDataline+2);
              *(pScanline+2) = *(pDataline+1);
              *(pScanline+3) = *pDataline;
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do simple alpha composing */
                                       /* alpha itself remains fully opaque !!! */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
                int i;
                for (i=2; i >= 0; i--)
                {
                MNG_COMPOSE8 (*(pScanline+i+1), *(pDataline+2-i), iFGa8, *(pScanline+i+1));
                }
#else
                MNG_COMPOSE8 (*(pScanline+1), *(pDataline+2), iFGa8, *(pScanline+1));
                MNG_COMPOSE8 (*(pScanline+2), *(pDataline+1), iFGa8, *(pScanline+2));
                MNG_COMPOSE8 (*(pScanline+3), *pDataline,     iFGa8, *(pScanline+3));
#endif
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline,     *(pDataline+1), *(pDataline+2), iFGa8,
                            *(pScanline+3), *(pScanline+2), *(pScanline+1), iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *pScanline     = iCa8;
                *(pScanline+1) = iCb8;
                *(pScanline+2) = iCg8;
                *(pScanline+3) = iCr8;
              }
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ABGR8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_ABGR8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_ABGR8_PM
mng_retcode mng_display_abgr8_pm (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint32 s, t;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ABGR8_PM, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
              if ((s = pDataline[6]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
              pScanline[0] = 255;
                  pScanline[1] = pDataline[4];
              pScanline[2] = pDataline[2];
              pScanline[3] = pDataline[0];
                  }
                  else
                  {
              pScanline[0] = (mng_uint8)s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i+1] = DIV255B8(s * pDataline[4-i-i]);
                }
              }
#else
              pScanline[1] = DIV255B8(s * pDataline[4]);
              pScanline[2] = DIV255B8(s * pDataline[2]);
              pScanline[3] = DIV255B8(s * pDataline[0]);
#endif           
                  }
              }
          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values and premultiply */
              if ((s = pDataline[3]) == 0)
                  *(mng_uint32*) pScanline = 0; /* set all components = 0 */
              else
              {
                  if (s == 255)
                  {
              pScanline[0] = 255;
                  pScanline[1] = pDataline[2];
              pScanline[2] = pDataline[1];
              pScanline[3] = pDataline[0];
                  }
                  else
                  {
              pScanline[0] = (mng_uint8)s;
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i+1] = DIV255B8(s * pDataline[2-i]);
                }
              }  
#else
              pScanline[1] = DIV255B8(s * pDataline[2]);
              pScanline[2] = DIV255B8(s * pDataline[1]);
                  pScanline[3] = DIV255B8(s * pDataline[0]);
#endif
                  }
              }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          if ((s = pDataline[6]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if (s == 255)
            {                          /* plain copy it */
              pScanline[0] = 255;
              pScanline[1] = pDataline[4];
              pScanline[2] = pDataline[2];
              pScanline[3] = pDataline[0];
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
              pScanline[0] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[0])));
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i+1] = DIV255B8(s * pDataline[4-i-i] + t *
                     pScanline[i+1]);
                }
              }
#else
                    pScanline[1] = DIV255B8(s * pDataline[4] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[2] + t * pScanline[2]);
              pScanline[3] = DIV255B8(s * pDataline[0] + t * pScanline[3]);
#endif
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          if ((s = pDataline[3]) != 0)       /* any opacity at all ? */
          {                            /* fully opaque ? */
            if (s == 255)
            {                          /* then simply copy the values */
              pScanline[0] = 255;
              pScanline[1] = pDataline[2];
              pScanline[2] = pDataline[1];
              pScanline[3] = pDataline[0];
            }
            else
            {                          /* now blend (premultiplied) */
                    t = 255 - s;
              pScanline[0] = (mng_uint8)(255 - DIV255B8(t * (255 - pScanline[0])));
#ifdef MNG_OPTIMIZE_FOOTPRINT_DIV
              {
                int i;
                for (i=2; i >= 0; i--)
                {
                  pScanline[i+1] = DIV255B8(s * pDataline[2-i] + t *
                     pScanline[i+1]);
                }
              }
#else
                    pScanline[1] = DIV255B8(s * pDataline[2] + t * pScanline[1]);
              pScanline[2] = DIV255B8(s * pDataline[1] + t * pScanline[2]);
              pScanline[3] = DIV255B8(s * pDataline[0] + t * pScanline[3]);
#endif
            }
          }

          pScanline += (pData->iColinc << 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_ABGR8_PM, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_ABGR8_PM */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGR565
mng_retcode mng_display_bgr565 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
#endif
  mng_uint8  iA8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR565, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol * 2) + (pData->iDestl * 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 ) | (   (*(pDataline+2)>>5)       ) );
          *pScanline     = (mng_uint8)( ( (*(pDataline+4)) >>3) | (   (*(pDataline+2)&0xFC) << 3) );

          pScanline += (pData->iColinc * 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 )  |  ( (*(pDataline+1)>>5   )     ) );
          *pScanline     = (mng_uint8)( (  *(pDataline+2) >>3 )  |  ( (*(pDataline+1)&0xFC ) << 3) );

              
          pScanline += (pData->iColinc * 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {

        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA16 = mng_get_uint16 (pDataline+6);

          if (iA16)                    /* any opacity at all ? */
          {
            if (iA16 == 0xFFFF)        /* fully opaque ? */
            {                          /* scale down by dropping the LSB */
              *(pScanline+1) = (mng_uint8)( (*(pDataline))&0xF8 )  |  (mng_uint8)( (*(pDataline+2)>>5  )     );
              *pScanline     = (mng_uint8)( (*(pDataline+4)) >>3)  |  (mng_uint8)( (*(pDataline+2)&0xFC) << 3);
            }
            else
            {                          /* get the proper values */
              iFGr16 = mng_get_uint16 (pDataline  );
              iFGg16 = mng_get_uint16 (pDataline+2);
              iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                    
              iBGb16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
              iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  |  (((*(pScanline  )) & 0xE0) >>3 ) );
              iBGr16 = (mng_uint16)( (*(pScanline  )) << 3   );

              iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
              iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
              MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
              MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                       /* and return the composed values */
              *(pScanline+1) = (mng_uint8) ( ( (iFGr16 >> 8)&0xF8 )  |  ( (mng_uint8)(iFGg16>>8) >> 5)      );
              *pScanline     = (mng_uint8) ( ( (iFGb16>>11)       )  |  (((mng_uint8)(iFGg16>>8)&0xFC) << 3) );
            }
          }

          pScanline += (pData->iColinc * 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */

          if (iA8)                     /* any opacity at all ? */
          {
            if (iA8 == 0xFF)           /* fully opaque ? */
            {                          /* then simply copy the values */
              *(pScanline+1) = (mng_uint8)( (  (*(pDataline)) &0xF8 )  |   (*(pDataline+1) >>5 )       );
              *pScanline     = (mng_uint8)( ( ((*(pDataline+2))>>3) )  |  ((*(pDataline+1)&0xFC) << 3) );
            }
            else
            {                          /* do alpha composing */
              mng_uint8 iRed, iGreen, iBlue;
                    
              iRed   = (mng_uint8) (  *(pScanline+1) & 0xF8 );
              iGreen = (mng_uint8) ( (*(pScanline+1) << 5)  |  ( ((*pScanline) & 0xE0)>>3 ) );
              iBlue  = (mng_uint8) ( (*pScanline << 3) );

              MNG_COMPOSE8 (iRed,     *pDataline,     iA8, iRed    );
              MNG_COMPOSE8 (iGreen,   *(pDataline+1), iA8, iGreen  );
              MNG_COMPOSE8 (iBlue,    *(pDataline+2), iA8, iBlue   );

              *(pScanline+1) = (mng_uint8) ( ( iRed  & 0xF8 )  |   (iGreen>>5) );
              *pScanline     = (mng_uint8) ( ( iBlue >>  3  )  | ( (iGreen & 0xFC) << 3) );
            }
          }

          pScanline += (pData->iColinc * 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGR565 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGB565
mng_retcode mng_display_rgb565 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
#endif
  mng_uint8  iA8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB565, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol * 2) + (pData->iDestl * 2);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *(pScanline+1) = (mng_uint8)( ( ( *(pDataline+4)) & 0xF8)  |   (*(pDataline+2) >> 5  )       );
          *pScanline     = (mng_uint8)( ( ( *(pDataline  )) >> 3  )  |  ((*(pDataline+2) & 0xFC) << 3) );

          pScanline += (pData->iColinc * 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline+2)) & 0xF8)  |   (*(pDataline+1) >> 5        ) );
          *pScanline     = (mng_uint8)( (  *(pDataline  )  >> 3  )  |  ((*(pDataline+1) & 0xFC) << 3) );
              
          pScanline += (pData->iColinc * 2);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {

        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA16 = mng_get_uint16 (pDataline+6);

          if (iA16)                    /* any opacity at all ? */
          {
            if (iA16 == 0xFFFF)        /* fully opaque ? */
            {                          /* scale down by dropping the LSB */
              *(pScanline+1) = (mng_uint8)( ( (*(pDataline+4)) & 0xF8)  |   (*(pDataline+2)>>5) );
              *pScanline     = (mng_uint8)( ( (*(pDataline  )) >> 3  )  |  ((*(pDataline+2)&0xFC) << 3) );
            }
            else
            {                          /* get the proper values */
              iFGr16 = mng_get_uint16 (pDataline  );
              iFGg16 = mng_get_uint16 (pDataline+2);
              iFGb16 = mng_get_uint16 (pDataline+4);
                                       
                                             /* scale background up */                
              iBGr16 = (mng_uint8)(  *(pScanline+1) & 0xF8 );
              iBGg16 = (mng_uint8)( (*(pScanline+1) << 5)  |  ( ((*pScanline) & 0xE0) >> 3 ) );
              iBGb16 = (mng_uint8)(  *(pScanline  ) << 3   );

              iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
              iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
              iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* now compose */
              MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
              MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
              MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                       /* and return the composed values */
              *(pScanline+1) = (mng_uint8)( (mng_uint8)((iFGb16 >> 8) &0xF8) |   (   (mng_uint8)(iFGg16 >> 8) >> 5  )        );
              *pScanline     = (mng_uint8)( (mng_uint8) (iFGr16 >>11)        |   ( ( (mng_uint8)(iFGg16 >> 8) & 0xFC) << 3)  );
            }
          }

          pScanline += (pData->iColinc * 2);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */

          if (iA8)                     /* any opacity at all ? */
          {
            if (iA8 == 0xFF)           /* fully opaque ? */
            {                          /* then simply copy the values */
              *(pScanline+1) = (mng_uint8)( ( (*(pDataline+2)) & 0xF8)  |  (  *(pDataline+1) >> 5         ) );
              *pScanline     = (mng_uint8)( ( (*(pDataline  )) >> 3  )  |  ( (*(pDataline+1) & 0xFC) << 3 ) );
            }
            else
            {                          /* do alpha composing */
              mng_uint8 iRed, iGreen, iBlue;

              iRed   = (mng_uint8)(   *(pScanline+1) & 0xF8);
              iGreen = (mng_uint8)( ( *(pScanline+1) << 5  )  |  ( ( (*pScanline)&0xE0)>>3 ) );
              iBlue  = (mng_uint8)(   *(pScanline  ) << 3 );

              MNG_COMPOSE8 (iRed,     *(pDataline+2), iA8, iRed    );
              MNG_COMPOSE8 (iGreen,   *(pDataline+1), iA8, iGreen  );
              MNG_COMPOSE8 (iBlue,    *(pDataline+0), iA8, iBlue   );

              *(pScanline+1) = (mng_uint8)( ( iRed & 0xF8)  |  (  iGreen >> 5        ) );
              *pScanline     = (mng_uint8)( (iBlue >> 3  )  |  ( (iGreen & 0xFC) << 3) );
            }
          }

          pScanline += (pData->iColinc * 2);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGB565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGB565 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGRA565
mng_retcode mng_display_bgra565 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA565, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl * 3);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 ) | (   (*(pDataline+2)>>5)       ) );
          *pScanline     = (mng_uint8)( ( (*(pDataline+4)) >>3) | (   (*(pDataline+2)&0xFC) << 3) );
          *(pScanline+2) = *(pDataline+6);

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 )  |  ( (*(pDataline+1)>>5   )     ) );
          *pScanline     = (mng_uint8)( (  *(pDataline+2) >>3 )  |  ( (*(pDataline+1)&0xFC ) << 3) );
          *(pScanline+2) = *(pDataline+3);

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*(pScanline+2));
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *(pScanline+1) = (mng_uint8)( (*(pDataline))&0xF8 )  |  (mng_uint8)( (*(pDataline+2)>>5  )     );
              *pScanline     = (mng_uint8)( (*(pDataline+4)) >>3)  |  (mng_uint8)( (*(pDataline+2)&0xFC) << 3); 
                    *(pScanline+2) = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGb16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  |  (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGr16 = (mng_uint16)( (*(pScanline  )) << 3   );
              
                        iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;

                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iFGr16 >> 8)&0xF8 )  |  ( (mng_uint8)(iFGg16>>8) >> 5)      );
                *pScanline     = (mng_uint8) ( ( (iFGb16>>11)       )  |  (((mng_uint8)(iFGg16>>8)&0xFC) << 3) );
              }
              else
              {                        /* scale background up */
                iBGb16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  |  (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGr16 = (mng_uint16)( (*(pScanline  )) << 3   );
                
                        iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iCr16 >>  8) & 0xF8 )  |  ( (mng_uint8)(iCg16 >> 8) >> 5  )       );
                *pScanline     = (mng_uint8) ( ( (iCb16 >> 11)        )  |  (((mng_uint8)(iCg16 >> 8) & 0xFC) << 3) );
                *(pScanline+2) = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *(pScanline+2);

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *(pScanline+1) = (mng_uint8)( (  (*(pDataline)) &0xF8 )  |   (*(pDataline+1) >>5 )       );
              *pScanline     = (mng_uint8)( ( ((*(pDataline+2))>>3) )  |  ((*(pDataline+1)&0xFC) << 3) );
              *(pScanline+2) = *(pDataline+3);              
            }
            else
            {
              mng_uint8 iRed, iGreen, iBlue;
      
              iRed   = (mng_uint8) (  *(pScanline+1) & 0xF8 );
              iGreen = (mng_uint8) ( (*(pScanline+1) << 5)  |  ( ((*pScanline) & 0xE0)>>3 ) );
              iBlue  = (mng_uint8) ( (*pScanline << 3) );         

              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do alpha composing */
                MNG_COMPOSE8 (iRed,   *pDataline,     iFGa8, iRed   );
                MNG_COMPOSE8 (iGreen, *(pDataline+1), iFGa8, iGreen );
                MNG_COMPOSE8 (iBlue,  *(pDataline+2), iFGa8, iBlue  );
                                       /* alpha remains fully opaque !!! */
                *(pScanline+1) = (mng_uint8) ( ( iRed  & 0xF8 )  |   (iGreen>>5) );
                *pScanline     = (mng_uint8) ( ( iBlue >>  3  )  | ( (iGreen & 0xFC) << 3) );
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline, *(pDataline+1), *(pDataline+2), iFGa8,
                            iRed      , iGreen        , iBlue         , iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */

                        
                *pScanline     = (mng_uint8) ( ( iCb8 >>  3  )  | ( (iCg8 & 0xFC) << 3) );
                *(pScanline+1) = (mng_uint8) ( ( iCr8  & 0xF8 )  |   (iCg8>>5) );
                        *(pScanline+2) = (mng_uint8) iCa8;
              }
            }
          }

          pScanline += (pData->iColinc *3);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGRA565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGRA565 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGBA565
mng_retcode mng_display_rgba565 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pDataline;
  mng_int32  iX;
  mng_uint8  iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iFGa16, iBGa16, iCa16;
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16;
  mng_uint16 iCr16, iCg16, iCb16;
#endif
  mng_uint8  iCr8, iCg8, iCb8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA565, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
                                       /* adjust destination row starting-point */
    pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl * 3);
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline+4))&0xF8 ) | (   (*(pDataline+2)>>5)       ) );
          *pScanline     = (mng_uint8)( ( (*(pDataline)) >>3) | (   (*(pDataline+2)&0xFC) << 3) );
          *(pScanline+2) = *(pDataline+6);

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline+2))&0xF8 )  |  ( (*(pDataline+1)>>5   )     ) );
          *pScanline     = (mng_uint8)( (  *(pDataline) >>3 )  |  ( (*(pDataline+1)&0xFC ) << 3) );
          *(pScanline+2) = *(pDataline+3);

          pScanline += (pData->iColinc * 3);
          pDataline += 4;
        }
      }
    }
    else
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* get alpha values */
          iFGa16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*(pScanline+2));
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iFGa16)                  /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
            {                          /* plain copy it */
              *(pScanline+1) = (mng_uint8)( (*(pDataline+4))&0xF8 )  |  (mng_uint8)( (*(pDataline+2)>>5  )     );
              *pScanline     = (mng_uint8)( (*(pDataline)) >>3)  |  (mng_uint8)( (*(pDataline+2)&0xFC) << 3); 
                    *(pScanline+2) = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {                        /* get the proper values */
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                       /* scale background up */
                iBGr16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  |  (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGb16 = (mng_uint16)( (*(pScanline  )) << 3   );
              
                        iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;

                                       /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iFGa16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iFGa16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iFGa16, iBGb16);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iFGb16 >> 8)&0xF8 )  |  ( (mng_uint8)(iFGg16>>8) >> 5)      );
                *pScanline     = (mng_uint8) ( ( (iFGr16>>11)       )  |  (((mng_uint8)(iFGg16>>8)&0xFC) << 3) );
              }
              else
              {                        /* scale background up */
                iBGr16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  |  (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGb16 = (mng_uint16)( (*(pScanline  )) << 3   );

                        iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iFGa16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iCb16 >>  8) & 0xF8 )  |  ( (mng_uint8)(iCg16 >> 8) >> 5  )       );
                *pScanline     = (mng_uint8) ( ( (iCr16 >> 11)        )  |  (((mng_uint8)(iCg16 >> 8) & 0xFC) << 3) );
                *(pScanline+2) = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc * 3);
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iFGa8 = *(pDataline+3);      /* get alpha values */
          iBGa8 = *(pScanline+2);

          if (iFGa8)                   /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iFGa8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *(pScanline+1) = (mng_uint8)( (  (*(pDataline+2)) &0xF8 )  |   (*(pDataline+1) >>5 )       );
              *pScanline     = (mng_uint8)( ( ((*(pDataline))>>3) )  |  ((*(pDataline+1)&0xFC) << 3) );
              *(pScanline+2) = *(pDataline+3);              
            }
            else
            {
              mng_uint8 iRed, iGreen, iBlue;
      
              iBlue   = (mng_uint8) (  *(pScanline+1) & 0xF8 );
              iGreen = (mng_uint8) ( (*(pScanline+1) << 5)  |  ( ((*pScanline) & 0xE0)>>3 ) );
              iRed  = (mng_uint8) ( (*pScanline << 3) );          

              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {                        /* do alpha composing */
                MNG_COMPOSE8 (iRed,   *pDataline,     iFGa8, iRed   );
                MNG_COMPOSE8 (iGreen, *(pDataline+1), iFGa8, iGreen );
                MNG_COMPOSE8 (iBlue,  *(pDataline+2), iFGa8, iBlue  );
                                       /* alpha remains fully opaque !!! */
                *(pScanline+1) = (mng_uint8) ( ( iBlue  & 0xF8 )  |   (iGreen>>5) );
                *pScanline     = (mng_uint8) ( ( iRed >>  3  )  | ( (iGreen & 0xFC) << 3) );
              }
              else
              {                        /* now blend */
                MNG_BLEND8 (*pDataline, *(pDataline+1), *(pDataline+2), iFGa8,
                            iRed      , iGreen        , iBlue         , iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */

                        
                *pScanline     = (mng_uint8) ( ( iCr8 >>  3  )  | ( (iCg8 & 0xFC) << 3) );
                *(pScanline+1) = (mng_uint8) ( ( iCb8  & 0xF8 )  |   (iCg8>>5) );
                        *(pScanline+2) = (mng_uint8) iCa8;
              }
            }
          }

          pScanline += (pData->iColinc *3);
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGBA565 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGR565_A8
mng_retcode mng_display_bgr565_a8 (mng_datap pData)
{
  mng_uint8p pScanline;
  mng_uint8p pAlphaline;
  mng_uint8p pDataline;
  mng_int32  iX;
#ifndef MNG_NO_16BIT_SUPPORT
  mng_uint16 iA16;
  mng_uint16 iFGr16, iFGg16, iFGb16;
  mng_uint16 iBGr16, iBGg16, iBGb16, iBGa16;
  mng_uint16 iCr16,  iCg16,  iCb16,  iCa16;
#endif
  mng_uint8  iA8, iBGa8, iCa8;
  mng_uint8  iCr8, iCg8, iCb8;


#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR565_A8, MNG_LC_START);
#endif
                                       /* viewable row ? */
  if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
  {                                    /* address destination row */
    pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
                                                   pData->iRow + pData->iDestt -
                                                   pData->iSourcet);
    pAlphaline = (mng_uint8p)pData->fGetalphaline  (((mng_handle)pData),
                                                    pData->iRow + pData->iDestt -
                                                    pData->iSourcet);
                                       /* adjust destination row
starting-point */
    pScanline = pScanline + (pData->iCol * 2) + (pData->iDestl * 2);
    pAlphaline = pAlphaline + pData->iCol + pData->iDestl;
    pDataline = pData->pRGBArow;       /* address source row */

#ifndef MNG_NO_16BIT_SUPPORT
    if (pData->bIsRGBA16)              /* adjust source row
starting-point */
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
    else
#endif
      pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);

    if (pData->bIsOpaque)              /* forget about transparency ? */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* scale down by dropping the LSB */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 ) | ((*(pDataline+2)>>5)       ) );
          *pScanline     = (mng_uint8)( ( (*(pDataline+4)) >>3) | ((*(pDataline+2)&0xFC) << 3) );
          *pAlphaline    = (mng_uint8)(*(pDataline+6));

          pScanline += (pData->iColinc * 2);
          pAlphaline += pData->iColinc;
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {                              /* copy the values */
          *(pScanline+1) = (mng_uint8)( ( (*(pDataline))&0xF8 )  |  ((*(pDataline+1)>>5   )     ) );
          *pScanline     = (mng_uint8)( (  *(pDataline+2) >>3 )  |  ((*(pDataline+1)&0xFC ) << 3) );
          *pAlphaline    = (mng_uint8)(*(pDataline+3));

          pScanline += (pData->iColinc * 2);
          pAlphaline += pData->iColinc;
          pDataline += 4;
        }
      }
    }
    else /* Not fully opaque */
    {
#ifndef MNG_NO_16BIT_SUPPORT
      if (pData->bIsRGBA16)            /* 16-bit input row ? */
      {

        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
        {
          iA16 = mng_get_uint16 (pDataline+6);
          iBGa16 = (mng_uint16)(*pAlphaline);
          iBGa16 = (mng_uint16)(iBGa16 << 8) | iBGa16;

          if (iA16)                    /* any opacity at all ? */
          {
            if ((iA16 == 0xFFFF) || (iBGa16 == 0))       /* fully opaque or background fully transparent ? */
            {                          /* scale down by dropping the LSB */
              *(pScanline+1) = (mng_uint8)( (*(pDataline))&0xF8 )  | (mng_uint8)( (*(pDataline+2)>>5  )     );
              *pScanline     = (mng_uint8)( (*(pDataline+4)) >>3)  | (mng_uint8)( (*(pDataline+2)&0xFC) << 3);
              *pAlphaline    = *(pDataline+6);
            }
            else
            {
              if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
              {
                                        /* get the proper values */
                iFGr16 = mng_get_uint16 (pDataline  );
                iFGg16 = mng_get_uint16 (pDataline+2);
                iFGb16 = mng_get_uint16 (pDataline+4);
                                         /* scale background up */

                iBGb16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  | (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGr16 = (mng_uint16)( (*(pScanline  )) << 3   );

                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                         /* now compose */
                MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16);
                MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16);
                MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16);
                                         /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iFGr16 >> 8)&0xF8 )  | ( (mng_uint8)(iFGg16>>8) >> 5)       );
                *pScanline     = (mng_uint8) ( ( (iFGb16>>11)       )  | (((mng_uint8)(iFGg16>>8)&0xFC) << 3) );
                *pAlphaline    = (mng_uint8)(iA16>>8);
              }
              else /* background is not fully opaque */
              {                         /* scale background up */
                iBGb16 = (mng_uint16)( (*(pScanline+1)) & 0xF8 );
                iBGg16 = (mng_uint16)( (*(pScanline+1) << 5)  | (((*(pScanline  )) & 0xE0) >>3 ) );
                iBGr16 = (mng_uint16)( (*(pScanline  )) << 3   );

                iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
                iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
                iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
                                       /* let's blend */
                MNG_BLEND16 (mng_get_uint16 (pDataline  ),
                             mng_get_uint16 (pDataline+2),
                             mng_get_uint16 (pDataline+4), iA16,
                             iBGr16, iBGg16, iBGb16, iBGa16,
                             iCr16,  iCg16,  iCb16,  iCa16);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( (iCr16 >> 8)&0xF8 )  | ( (mng_uint8)(iCg16>>8) >> 5)       );
                *pScanline     = (mng_uint8) ( ( (iCb16>>11)       )  | (((mng_uint8)(iCg16>>8)&0xFC) << 3) );
                *pAlphaline    = (mng_uint8)(iCa16 >> 8);
              }
            }
          }

          pScanline += (pData->iColinc * 2);
          pAlphaline += pData->iColinc;
          pDataline += 8;
        }
      }
      else
#endif
      {
        for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer;
iX += pData->iColinc)
        {
          iA8 = *(pDataline+3);        /* get alpha value */
          iBGa8 = *pAlphaline;

          if (iA8)                     /* any opacity at all ? */
          {                            /* fully opaque or background fully transparent ? */
            if ((iA8 == 0xFF) || (iBGa8 == 0))
            {                          /* then simply copy the values */
              *(pScanline+1) = (mng_uint8)( (  (*(pDataline)) &0xF8 )  | (*(pDataline+1) >>5 )        );
              *pScanline     = (mng_uint8)( ( ((*(pDataline+2))>>3) )  | ((*(pDataline+1)&0xFC) << 3) );
              *pAlphaline    = *(pDataline+3);
            }
            else
            {
              if (iBGa8 == 0xFF)       /* background fully opaque ? */
              {
                /* do alpha composing */
                mng_uint8 iRed, iGreen, iBlue;

                iRed   = (mng_uint8) (  *(pScanline+1) & 0xF8 );
                iGreen = (mng_uint8) ( (*(pScanline+1) << 5)  |  (((*pScanline) & 0xE0)>>3 ) );
                iBlue  = (mng_uint8) ( (*pScanline << 3) );

                MNG_COMPOSE8 (iRed,     *pDataline,     iA8, iRed    );
                MNG_COMPOSE8 (iGreen,   *(pDataline+1), iA8, iGreen  );
                MNG_COMPOSE8 (iBlue,    *(pDataline+2), iA8, iBlue   );

                *(pScanline+1) = (mng_uint8) ( ( iRed  & 0xF8 )  | (iGreen>>5) );
                *pScanline     = (mng_uint8) ( ( iBlue >>  3  )  | ((iGreen & 0xFC) << 3) );
                *pAlphaline    = iA8;
              }
              else /* background not fully opaque */
              {
                MNG_BLEND8 (*pDataline, *(pDataline+1), *(pDataline+2), iA8,
                            *pScanline, *(pScanline+1), *(pScanline+2), iBGa8,
                            iCr8, iCg8, iCb8, iCa8);
                                       /* and return the composed values */
                *(pScanline+1) = (mng_uint8) ( ( iCr8  & 0xF8 )  | (iCg8>>5) );
                *pScanline     = (mng_uint8) ( ( iCb8 >>  3  )  | ((iCg8 & 0xFC) << 3) );
                *pAlphaline    = iCa8;
              }
            }
          }

          pScanline += (pData->iColinc * 2);
          pAlphaline += pData->iColinc;
          pDataline += 4;
        }
      }
    }
  }

  check_update_region (pData);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_BGR565_A8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGR565_A8 */


/* ************************************************************************** */
/* *                                                                        * */
/* * Background restore routines - restore the background with info from    * */
/* * the BACK and/or bKGD chunk or the app's background canvas              * */
/* *                                                                        * */
/* ************************************************************************** */

mng_retcode mng_restore_bkgd_backimage (mng_datap pData)
{
                                       /* save some stuff */
  mng_uint8p  pRGBArow    = pData->pRGBArow;
  mng_int32   iRow        = pData->iRow;
  mng_int32   iRowsamples = pData->iRowsamples;

  mng_retcode iRetcode;                /* work variables */
  mng_uint8p  pTemp;
  mng_uint8p  pWork       = pRGBArow;
  mng_uint32  iX;
  mng_int32   iZ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BACKIMAGE, MNG_LC_START);
#endif
                                       /* determine row to retrieve */
  pData->iRow        = pData->iDestt + iRow + pData->iBackimgoffsy;

  while (pData->iRow >= (mng_int32)pData->iBackimgheight)
    pData->iRow -= (mng_int32)pData->iBackimgheight;
                                       /* set width to that of background image */
  pData->iRowsamples = pData->iBackimgwidth;
                                       /* retrieve into alternate buffer ! */
  pData->pRGBArow    = pData->pPrevrow;
                                       /* get it then */
  iRetcode = ((mng_retrieverow)pData->fRetrieverow) (pData);

  if (iRetcode)                        /* on error; bail out */
    return iRetcode;
                                       /* we got the full row; but now need to
                                          paste it into the proper location */
  iX = pData->iDestl - pData->iBackimgoffsx;

  while (iX >= pData->iBackimgwidth)
    iX -= pData->iBackimgwidth;

#ifndef MNG_NO_16BIT_SUPPORT
  if (pData->bIsRGBA16)                /* 16-bit buffer ? */
  {
    pTemp = pData->pPrevrow + (iX << 3);

    for (iZ = (pData->iDestr - pData->iDestl); iZ > 0; iZ--)
    {
      MNG_COPY (pWork, pTemp, 8);

      pWork += 8;
      pTemp += 8;
      iX++;
                                       /* reached end of bkgd-image line ? */
      if (iX >= pData->iBackimgwidth)
      {
        iX    = 0;
        pTemp = pData->pPrevrow;
      }
    }
  }
  else
#endif
  {
    pTemp = pData->pPrevrow + (iX << 2);

    for (iZ = (pData->iDestr - pData->iDestl); iZ > 0; iZ--)
    {
      MNG_COPY (pWork, pTemp, 4);

      pWork += 4;
      pTemp += 4;
      iX++;
                                       /* reached end of bkgd-image line ? */
      if (iX >= pData->iBackimgwidth)
      {
        iX    = 0;
        pTemp = pData->pPrevrow;
      }
    }
  }

  pData->pRGBArow    = pRGBArow;       /* restore original values */
  pData->iRow        = iRow;
  pData->iRowsamples = iRowsamples;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BACKIMAGE, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_restore_bkgd_backcolor (mng_datap pData)
{
  mng_int32   iX;
  mng_uint32p pWork32 = (mng_uint32p)pData->pRGBArow;
  mng_uint32  iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BACKCOLOR, MNG_LC_START);
#endif

#ifdef MNG_BIGENDIAN_SUPPORTED
  /* fast way for big endian */
  iWrite = (((mng_uint8)(pData->iBACKred   >> 8)) << 24) |
               (((mng_uint8)(pData->iBACKgreen >> 8)) << 16) |
               (((mng_uint8)(pData->iBACKblue  >> 8)) <<  8) |
           ( 0xFF                                      );
#elif defined(MNG_LITTLEENDIAN_SUPPORTED)
  /* fast way for little endian */
  iWrite = ( 0xFF                                 << 24) |
           (((mng_uint8)(pData->iBACKblue  >> 8)) << 16) |
               (((mng_uint8)(pData->iBACKgreen >> 8)) <<  8) |
               (((mng_uint8)(pData->iBACKred   >> 8))      );
#else
  /* generic way, works on all platforms */
  /* put the data in memory in the correct order */
  {
    mng_uint8 aBytes[4];
    aBytes[0] = (mng_uint8)(pData->iBACKred   >> 8);
    aBytes[1] = (mng_uint8)(pData->iBACKgreen >> 8);
    aBytes[2] = (mng_uint8)(pData->iBACKblue  >> 8);
    aBytes[3] = 0xFF;
    /* load that data into a register */
    iWrite = *(mng_uint32*) aBytes;
  }
#endif
                                       /* ok; drop the background-color in there */
  for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    *pWork32++ = iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BACKCOLOR, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_bKGD
mng_retcode mng_restore_bkgd_bkgd (mng_datap pData)
{
  mng_int32      iX;
  mng_uint8p     pWork   = pData->pRGBArow;
  mng_imagep     pImage  = (mng_imagep)pData->pCurrentobj;
  mng_imagedatap pBuf    = pImage->pImgbuf;
  mng_uint8      iRed    = 0;
  mng_uint8      iGreen  = 0;
  mng_uint8      iBlue   = 0;
  mng_uint32p    pWork32 = (mng_uint32p)pWork;
  mng_uint32     iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BKGD, MNG_LC_START);
#endif

  switch (pBuf->iColortype)
  {
    case 0 : ;                         /* gray types */
    case 4 : {
               mng_uint8 iGray;

#ifndef MNG_NO_16BIT_SUPPORT
               if (pBuf->iBitdepth > 8)
                 iGray = (mng_uint8)(pBuf->iBKGDgray >> 8);
               else
#endif
               {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
                 /* LBR scaling */
                 mng_uint8 multiplier[]={0,255,85,0,17,0,0,0,1};
                 iGray = (mng_uint8)(multiplier[pBuf->iBitdepth] * pBuf->iBKGDgray);
#else
                 iGray = (mng_uint8)pBuf->iBKGDgray;
#endif
               }

               iRed   = iGray;
               iGreen = iGray;
               iBlue  = iGray;

               break;
             }
             
    case 3 : {                         /* indexed type */
               iRed   = pBuf->aPLTEentries [pBuf->iBKGDindex].iRed;
               iGreen = pBuf->aPLTEentries [pBuf->iBKGDindex].iGreen;
               iBlue  = pBuf->aPLTEentries [pBuf->iBKGDindex].iBlue;

               break;
             }

    case 2 : ;                         /* rgb types */
    case 6 : {
#ifndef MNG_NO_16BIT_SUPPORT
               if (pBuf->iBitdepth > 8)
               {
                 iRed   = (mng_uint8)(pBuf->iBKGDred   >> 8);
                 iGreen = (mng_uint8)(pBuf->iBKGDgreen >> 8);
                 iBlue  = (mng_uint8)(pBuf->iBKGDblue  >> 8);
               }
               else
#endif
               {
                 iRed   = (mng_uint8)(pBuf->iBKGDred  );
                 iGreen = (mng_uint8)(pBuf->iBKGDgreen);
                 iBlue  = (mng_uint8)(pBuf->iBKGDblue );
               }

               break;
             }
  }

#ifdef MNG_BIGENDIAN_SUPPORTED
  /* fast way for big endian */
  iWrite = (iRed   << 24) |
               (iGreen << 16) |
               (iBlue  <<  8);
#elif defined(MNG_LITTLEENDIAN_SUPPORTED)
  /* fast way for little endian */
  iWrite = (iBlue  << 16) |
               (iGreen <<  8) |
               (iRed        );
#else
  /* generic way, works on all platforms */
  /* put the data in memory in the correct order */
  {
    mng_uint8 aBytes[4];
    aBytes[0] = (mng_uint8)(iRed);
    aBytes[1] = (mng_uint8)(iGreen);
    aBytes[2] = (mng_uint8)(iBlue);
    aBytes[3] = 0x00;
    /* load that data into a register */
    iWrite = *(mng_uint32*) aBytes;
  }
#endif
                                       /* ok; drop it in there */
  for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    *pWork32++ = iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BKGD, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_restore_bkgd_bgcolor (mng_datap pData)
{
  mng_int32   iX;
  mng_uint32p pWork32 = (mng_uint32p)pData->pRGBArow;
  mng_uint32  iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGCOLOR, MNG_LC_START);
#endif

#ifdef MNG_BIGENDIAN_SUPPORTED
  /* fast way for big endian */
  iWrite = (((mng_uint8)(pData->iBGred   >> 8)) << 24) |
               (((mng_uint8)(pData->iBGgreen >> 8)) << 16) |
               (((mng_uint8)(pData->iBGblue  >> 8)) <<  8);
#elif defined(MNG_LITTLEENDIAN_SUPPORTED)
  /* fast way for little endian */
  iWrite = (((mng_uint8)(pData->iBGblue  >> 8)) << 16) |
               (((mng_uint8)(pData->iBGgreen >> 8)) <<  8) |
               (((mng_uint8)(pData->iBGred   >> 8))      );
#else
  /* generic way, works on all platforms */
  /* put the data in memory in the correct order */
  {
    mng_uint8 aBytes[4];
    aBytes[0] = (mng_uint8)(pData->iBGred   >> 8);
    aBytes[1] = (mng_uint8)(pData->iBGgreen >> 8);
    aBytes[2] = (mng_uint8)(pData->iBGblue  >> 8);
    aBytes[3] = 0x00;
    /* load that data into a register */
    iWrite = *(mng_uint32*) aBytes;
  }
#endif
                                       /* ok; drop the background-color in there */
  for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    *pWork32++ = iWrite;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGCOLOR, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGB8
mng_retcode mng_restore_bkgd_rgb8 (mng_datap pData)
{
  mng_int32  iX;
  mng_uint8p pBkgd;
  mng_uint8p pWork = pData->pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_RGB8, MNG_LC_START);
#endif

  if (pData->fGetbkgdline)             /* can we access the background ? */
  {                                    /* point to the right pixel then */
    pBkgd = (mng_uint8p)pData->fGetbkgdline ((mng_handle)pData,
                                             pData->iRow + pData->iDestt) +
            (3 * pData->iDestl);

    for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    {
      *pWork     = *pBkgd;             /* ok; copy the pixel */
      *(pWork+1) = *(pBkgd+1);
      *(pWork+2) = *(pBkgd+2);
      *(pWork+3) = 0x00;               /* transparant for alpha-canvasses */

      pWork += 4;
      pBkgd += 3;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGB8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGR8
mng_retcode mng_restore_bkgd_bgr8 (mng_datap pData)
{
  mng_int32  iX;
  mng_uint8p pBkgd;
  mng_uint8p pWork = pData->pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGR8, MNG_LC_START);
#endif

  if (pData->fGetbkgdline)             /* can we access the background ? */
  {                                    /* point to the right pixel then */
    pBkgd = (mng_uint8p)pData->fGetbkgdline ((mng_handle)pData,
                                             pData->iRow + pData->iDestt) +
            (3 * pData->iDestl);

    for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    {
      *pWork     = *(pBkgd+2);         /* ok; copy the pixel */
      *(pWork+1) = *(pBkgd+1);
      *(pWork+2) = *pBkgd;
      *(pWork+3) = 0x00;               /* transparant for alpha-canvasses */

      pWork += 4;
      pBkgd += 3;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGR8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGR8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGRX8
mng_retcode mng_restore_bkgd_bgrx8 (mng_datap pData)
{
  mng_int32  iX;
  mng_uint8p pBkgd;
  mng_uint8p pWork = pData->pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGRX8, MNG_LC_START);
#endif

  if (pData->fGetbkgdline)             /* can we access the background ? */
  {                                    /* point to the right pixel then */
    pBkgd = (mng_uint8p)pData->fGetbkgdline ((mng_handle)pData,
                                             pData->iRow + pData->iDestt) +
            (3 * pData->iDestl);

    for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    {
      *pWork     = *(pBkgd+2);         /* ok; copy the pixel */
      *(pWork+1) = *(pBkgd+1);
      *(pWork+2) = *pBkgd;
      *(pWork+3) = 0x00;               /* transparant for alpha-canvasses */

      pWork += 4;
      pBkgd += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGRX8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGRX8 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_BGR565
mng_retcode mng_restore_bkgd_bgr565 (mng_datap pData)
{
  mng_int32  iX;
  mng_uint8p pBkgd;
  mng_uint8p pWork = pData->pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGR565, MNG_LC_START);
#endif

  if (pData->fGetbkgdline)             /* can we access the background ? */
  {                                    /* point to the right pixel then */
    pBkgd = (mng_uint8p)pData->fGetbkgdline ((mng_handle)pData,
                                             pData->iRow + pData->iDestt) +
            (3 * pData->iDestl);

    for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    {
      *pWork     = (mng_uint8)(  *(pBkgd+1) & 0xF8);             /* ok; copy the pixel */
      *(pWork+1) = (mng_uint8)( (*(pBkgd+1) << 5 )  |  ( ((*pBkgd)&0xE0)>>3 ) );
      *(pWork+2) = (mng_uint8)(  *(pBkgd) << 3 );
      *(pWork+3) = 0x00;               /* transparant for alpha-canvasses */

      pWork += 4;
      pBkgd += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_BGR565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_BGR565 */

/* ************************************************************************** */

#ifndef MNG_SKIPCANVAS_RGB565
mng_retcode mng_restore_bkgd_rgb565 (mng_datap pData)
{
  mng_int32  iX;
  mng_uint8p pBkgd;
  mng_uint8p pWork = pData->pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_RGB565, MNG_LC_START);
#endif
 
  if (pData->fGetbkgdline)             /* can we access the background ? */
  {                                    /* point to the right pixel then */
    pBkgd = (mng_uint8p)pData->fGetbkgdline ((mng_handle)pData,
                                             pData->iRow + pData->iDestt) +
            (3 * pData->iDestl);

    for (iX = (pData->iSourcer - pData->iSourcel); iX > 0; iX--)
    {
      *pWork     = (mng_uint8)(  *(pBkgd)&0xF8);             /* ok; copy the pixel */
      *(pWork+1) = (mng_uint8)( (*(pBkgd+1) << 5)  |  ( ((*pBkgd)&0xE0)>>3 ) );
      *(pWork+2) = (mng_uint8)(  *(pBkgd+1) << 3);
      *(pWork+3) = 0x00;               /* transparant for alpha-canvasses */
      
      pWork += 4;
      pBkgd += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RESTORE_RGB565, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RBB565 */


/* ************************************************************************** */
/* *                                                                        * */
/* * Row retrieval routines - retrieve processed & uncompressed row-data    * */
/* * from the current "object"                                              * */
/* *                                                                        * */
/* ************************************************************************** */

/* TODO: a serious optimization is to retrieve only those pixels that will
         actually be displayed; this would require changes in
         the "display_image" routine (in mng_display.c) &
         all the "retrieve_xxx" routines below &
         the "display_xxx" routines above !!!!!
         NOTE that "correct_xxx" routines would not require modification */

mng_retcode mng_retrieve_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iG;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_G8, MNG_LC_START);
#endif

  pRGBArow = pData->pRGBArow;          /* temporary work pointers */
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

  if (pBuf->bHasTRNS)                  /* tRNS in buffer ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iG = *pWorkrow;                  /* get the gray-value */
                                       /* is it transparent ? */
      if ((mng_uint16)iG == pBuf->iTRNSgray)
      {
        *pRGBArow     = 0x00;          /* nuttin to display */
        *(pRGBArow+1) = 0x00;
        *(pRGBArow+2) = 0x00;
        *(pRGBArow+3) = 0x00;
      }
      else
      {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
        mng_uint8 multiplier[]={0,255,85,0,17,0,0,0,1};
        iG = (mng_uint8)(iG * multiplier[pBuf->iBitdepth]);
#endif

        *pRGBArow     = iG;            /* put in intermediate row */
        *(pRGBArow+1) = iG;
        *(pRGBArow+2) = iG;
        *(pRGBArow+3) = 0xFF;
      }

      pWorkrow++;                      /* next pixel */
      pRGBArow += 4;
    }
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
      mng_uint8 multiplier[]={0,255,85,0,17,0,0,0,1};   /* LBR scaling */
      iG = (mng_uint8)(multiplier[pBuf->iBitdepth] * *pWorkrow);
#else
      iG = *pWorkrow;                  /* get the gray-value */
#endif

      *pRGBArow     = iG;              /* put in intermediate row */
      *(pRGBArow+1) = iG;
      *(pRGBArow+2) = iG;
      *(pRGBArow+3) = 0xFF;

      pWorkrow++;                      /* next pixel */
      pRGBArow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_retrieve_g16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint16     iG;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_G16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pRGBArow = pData->pRGBArow;
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

  if (pBuf->bHasTRNS)                  /* tRNS in buffer ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iG = mng_get_uint16 (pWorkrow);  /* get the gray-value */
                                       /* is it transparent ? */
      if (iG == pBuf->iTRNSgray)
      {                                /* nuttin to display */
        mng_put_uint16 (pRGBArow,   0x0000);
        mng_put_uint16 (pRGBArow+2, 0x0000);
        mng_put_uint16 (pRGBArow+4, 0x0000);
        mng_put_uint16 (pRGBArow+6, 0x0000);
      }
      else
      {                                /* put in intermediate row */
        mng_put_uint16 (pRGBArow,   iG);
        mng_put_uint16 (pRGBArow+2, iG);
        mng_put_uint16 (pRGBArow+4, iG);
        mng_put_uint16 (pRGBArow+6, 0xFFFF);
      }

      pWorkrow += 2;                   /* next pixel */
      pRGBArow += 8;
    }
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iG = mng_get_uint16 (pWorkrow);  /* get the gray-value */

      mng_put_uint16 (pRGBArow,   iG); /* and put in intermediate row */
      mng_put_uint16 (pRGBArow+2, iG);
      mng_put_uint16 (pRGBArow+4, iG);
      mng_put_uint16 (pRGBArow+6, 0xFFFF);

      pWorkrow += 2;                  /* next pixel */
      pRGBArow += 8;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_retrieve_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iR, iG, iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGB8, MNG_LC_START);
#endif

  pRGBArow = pData->pRGBArow;          /* temporary work pointers */
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

  if (pBuf->bHasTRNS)                  /* tRNS in buffer ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iR = *pWorkrow;                  /* get the rgb-values */
      iG = *(pWorkrow+1);
      iB = *(pWorkrow+2);
                                       /* is it transparent ? */
      if (((mng_uint16)iR == pBuf->iTRNSred  ) &&
          ((mng_uint16)iG == pBuf->iTRNSgreen) &&
          ((mng_uint16)iB == pBuf->iTRNSblue )    )
      {
        *pRGBArow     = 0x00;          /* nothing to display */
        *(pRGBArow+1) = 0x00;
        *(pRGBArow+2) = 0x00;
        *(pRGBArow+3) = 0x00;
      }
      else
      {
        *pRGBArow     = iR;            /* put in intermediate row */
        *(pRGBArow+1) = iG;
        *(pRGBArow+2) = iB;
        *(pRGBArow+3) = 0xFF;
      }

      pWorkrow += 3;                   /* next pixel */
      pRGBArow += 4;
    }
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pRGBArow     = *pWorkrow;       /* just copy the pixel */
      *(pRGBArow+1) = *(pWorkrow+1);
      *(pRGBArow+2) = *(pWorkrow+2);
      *(pRGBArow+3) = 0xFF;

      pWorkrow += 3;                   /* next pixel */
      pRGBArow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_retrieve_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint16     iR, iG, iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGB16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pRGBArow = pData->pRGBArow;
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

  if (pBuf->bHasTRNS)                  /* tRNS in buffer ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iR = mng_get_uint16 (pWorkrow);  /* get the rgb-values */
      iG = mng_get_uint16 (pWorkrow+2);
      iB = mng_get_uint16 (pWorkrow+4);
                                       /* is it transparent ? */
      if ((iR == pBuf->iTRNSred  ) &&
          (iG == pBuf->iTRNSgreen) &&
          (iB == pBuf->iTRNSblue )    )
      {                                /* nothing to display */
        mng_put_uint16 (pRGBArow,   0x0000);
        mng_put_uint16 (pRGBArow+2, 0x0000);
        mng_put_uint16 (pRGBArow+4, 0x0000);
        mng_put_uint16 (pRGBArow+6, 0x0000);
      }
      else
      {                                /* put in intermediate row */
        mng_put_uint16 (pRGBArow,   iR);
        mng_put_uint16 (pRGBArow+2, iG);
        mng_put_uint16 (pRGBArow+4, iB);
        mng_put_uint16 (pRGBArow+6, 0xFFFF);
      }

      pWorkrow += 6;                   /* next pixel */
      pRGBArow += 8;
    }
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* just copy the pixel */
      mng_put_uint16 (pRGBArow,   mng_get_uint16 (pWorkrow  ));
      mng_put_uint16 (pRGBArow+2, mng_get_uint16 (pWorkrow+2));
      mng_put_uint16 (pRGBArow+4, mng_get_uint16 (pWorkrow+4));
      mng_put_uint16 (pRGBArow+6, 0xFFFF);

      pWorkrow += 6;                   /* next pixel */
      pRGBArow += 8;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_retrieve_idx8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_IDX8, MNG_LC_START);
#endif

  pRGBArow = pData->pRGBArow;          /* temporary work pointers */
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

  if (pBuf->bHasTRNS)                  /* tRNS in buffer ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iQ = *pWorkrow;                  /* get the index */
                                       /* is it valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
                                       /* transparency for this index ? */
        if ((mng_uint32)iQ < pBuf->iTRNScount)
          *(pRGBArow+3) = pBuf->aTRNSentries [iQ];
        else
          *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pWorkrow++;                      /* next pixel */
      pRGBArow += 4;
    }
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iQ = *pWorkrow;                  /* get the index */
                                       /* is it valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
        *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pWorkrow++;                      /* next pixel */
      pRGBArow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_IDX8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_retrieve_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iG;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_GA8, MNG_LC_START);
#endif

  pRGBArow = pData->pRGBArow;          /* temporary work pointers */
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iG = *pWorkrow;                    /* get the gray-value */
    *pRGBArow     = iG;                /* put in intermediate row */
    *(pRGBArow+1) = iG;
    *(pRGBArow+2) = iG;
    *(pRGBArow+3) = *(pWorkrow+1);

    pWorkrow += 2;                     /* next pixel */
    pRGBArow += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_retrieve_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint16     iG;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_GA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pRGBArow = pData->pRGBArow;
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iG = mng_get_uint16 (pWorkrow);    /* get the gray-value */

    mng_put_uint16 (pRGBArow,   iG);   /* and put in intermediate row */
    mng_put_uint16 (pRGBArow+2, iG);
    mng_put_uint16 (pRGBArow+4, iG);
    mng_put_uint16 (pRGBArow+6, mng_get_uint16 (pWorkrow+2));

    pWorkrow += 4;                     /* next pixel */
    pRGBArow += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_retrieve_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGBA8, MNG_LC_START);
#endif

  pRGBArow = pData->pRGBArow;          /* temporary work pointers */
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);
                                       /* can't be easier than this ! */
  MNG_COPY (pRGBArow, pWorkrow, pBuf->iRowsize);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_retrieve_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pRetrieveobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGBA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pRGBArow = pData->pRGBArow;
  pWorkrow = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize);
                                       /* can't be easier than this ! */
  MNG_COPY (pRGBArow, pWorkrow, pBuf->iRowsize);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_RETRIEVE_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Row storage routines - store processed & uncompressed row-data         * */
/* * into the current "object"                                              * */
/* *                                                                        * */
/* ************************************************************************** */

mng_retcode mng_store_g1 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0x80;
    }

    if (iB & iM)                       /* is it white ? */
      *pOutrow = 0x01;                 /* white */
    else
      *pOutrow = 0x00;                 /* black */

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  1;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_g2 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xC0;
      iS = 6;
    }

    iQ = (mng_uint8)((iB & iM) >> iS); /* get the gray level */
    *pOutrow = iQ;                     /* put in object buffer */

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  2;
    iS -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_g4 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xF0;
      iS = 4;
    }

    iQ = (mng_uint8)((iB & iM) >> iS); /* get the gray level */
    *pOutrow = iQ;                     /* put in object buffer */

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  4;
    iS -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in object buffer */

    pOutrow += pData->iColinc;         /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_g16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                                    /* copy into object buffer */
    mng_put_uint16 (pOutrow, mng_get_uint16 (pWorkrow));

    pOutrow  += (pData->iColinc << 1); /* next pixel */
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_store_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGB8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow     = *pWorkrow;          /* copy the RGB bytes */
    *(pOutrow+1) = *(pWorkrow+1);
    *(pOutrow+2) = *(pWorkrow+2);

    pWorkrow += 3;                     /* next pixel */
    pOutrow  += (pData->iColinc * 3);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGB16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    MNG_COPY (pOutrow, pWorkrow, 6);   /* copy the RGB bytes */

    pWorkrow += 6;                     /* next pixel */
    pOutrow  += (pData->iColinc * 6);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_store_idx1 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0x80;
    }

    if (iB & iM)                       /* store the index */
      *pOutrow = 0x01;
    else
      *pOutrow = 0x00;

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  1;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_idx2 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xC0;
      iS = 6;
    }
                                       /* store the index */
    *pOutrow = (mng_uint8)((iB & iM) >> iS);

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  2;
    iS -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_idx4 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xF0;
      iS = 4;
    }
                                       /* store the index */
    *pOutrow = (mng_uint8)((iB & iM) >> iS);

    pOutrow += pData->iColinc;         /* next pixel */
    iM >>=  4;
    iS -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_idx8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in object buffer */

    pOutrow += pData->iColinc;         /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_IDX8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_store_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_GA8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow     = *pWorkrow;          /* copy the GA bytes */
    *(pOutrow+1) = *(pWorkrow+1);

    pWorkrow += 2;                     /* next pixel */
    pOutrow  += (pData->iColinc << 1);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_GA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    MNG_COPY (pOutrow, pWorkrow, 4);   /* copy the GA bytes */

    pWorkrow += 4;                     /* next pixel */
    pOutrow  += (pData->iColinc << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_store_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGBA8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow     = *pWorkrow;          /* copy the RGBA bytes */
    *(pOutrow+1) = *(pWorkrow+1);
    *(pOutrow+2) = *(pWorkrow+2);
    *(pOutrow+3) = *(pWorkrow+3);

    pWorkrow += 4;                     /* next pixel */
    pOutrow  += (pData->iColinc << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGBA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    MNG_COPY (pOutrow, pWorkrow, 8);   /* copy the RGBA bytes */

    pWorkrow += 8;                     /* next pixel */
    pOutrow  += (pData->iColinc << 3);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Row storage routines (JPEG) - store processed & uncompressed row-data  * */
/* * into the current "object"                                              * */
/* *                                                                        * */
/* ************************************************************************** */

#ifdef MNG_INCLUDE_JNG

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8, MNG_LC_START);
#endif

  pWorkrow = pData->pJPEGrow;          /* temporary work pointers */
  pOutrow  = pBuf->pImgdata + (pData->iJPEGrow * pBuf->iRowsize);
                                       /* easy as pie ... */
  MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8, MNG_LC_END);
#endif

  return mng_next_jpeg_row (pData);    /* we've got one more row of gray-samples */
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
#if RGB_PIXELSIZE != 3
  mng_int32      iX;
#endif

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8, MNG_LC_START);
#endif

  pWorkrow = pData->pJPEGrow;          /* temporary work pointers */
  pOutrow  = pBuf->pImgdata + (pData->iJPEGrow * pBuf->iRowsize);

#if RGB_PIXELSIZE == 3
                                       /* easy as pie ... */
  MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples * 3);
#else
#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow     = *pWorkrow;          /* copy pixel into object buffer */
    *(pOutrow+1) = *(pWorkrow+1);
    *(pOutrow+2) = *(pWorkrow+2);

    pOutrow  += 3;                     /* next pixel */
    pWorkrow += RGB_PIXELSIZE;
  }
#endif

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8, MNG_LC_END);
#endif

  return mng_next_jpeg_row (pData);    /* we've got one more row of rgb-samples */
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_GA8, MNG_LC_START);
#endif

  pWorkrow = pData->pJPEGrow;          /* temporary work pointers */
  pOutrow  = pBuf->pImgdata + (pData->iJPEGrow * pBuf->iRowsize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* copy into object buffer */

    pOutrow += 2;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_GA8, MNG_LC_END);
#endif

  return mng_next_jpeg_row (pData);    /* we've got one more row of gray-samples */
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGBA8, MNG_LC_START);
#endif

  pWorkrow = pData->pJPEGrow;          /* temporary work pointers */
  pOutrow  = pBuf->pImgdata + (pData->iJPEGrow * pBuf->iRowsize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow     = *pWorkrow;          /* copy pixel into object buffer */
    *(pOutrow+1) = *(pWorkrow+1);
    *(pOutrow+2) = *(pWorkrow+2);

    pOutrow  += 4;                     /* next pixel */
    pWorkrow += RGB_PIXELSIZE;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGBA8, MNG_LC_END);
#endif

  return mng_next_jpeg_row (pData);    /* we've got one more row of rgb-samples */
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8_alpha (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_ALPHA, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pJPEGrow2;
  pOutrow  = pBuf->pImgdata + (pData->iJPEGalpharow * pBuf->iRowsize) + 1;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in object buffer */

    pOutrow += 2;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_ALPHA, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8_alpha (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_ALPHA, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pJPEGrow2;
  pOutrow  = pBuf->pImgdata + (pData->iJPEGalpharow * pBuf->iRowsize) + 3;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in object buffer */

    pOutrow += 4;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_ALPHA, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8_a1 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0x80;
    }

    if (iB & iM)                       /* is it opaque ? */
      *pOutrow = 0xFF;                 /* opaque */
    else
      *pOutrow = 0x00;                 /* transparent */

    pOutrow += 2;                      /* next pixel */
    iM >>=  1;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A1, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8_a2 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xC0;
      iS = 6;
    }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
    {
      const mng_uint8  alpha_level[4] = { 0x00, 0x55, 0xAA, 0xFF};
        *pOutrow = alpha_level[((iB & iM) >> iS)] ;
    }
#else
    switch ((iB & iM) >> iS)           /* determine the alpha level */
    {
      case 0x03 : { *pOutrow = 0xFF; break; }
      case 0x02 : { *pOutrow = 0xAA; break; }
      case 0x01 : { *pOutrow = 0x55; break; }
      default   : { *pOutrow = 0x00; }
    }
#endif

    pOutrow += 2;                      /* next pixel */
    iM >>=  2;
    iS -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A2, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8_a4 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xF0;
      iS = 4;
    }
                                       /* get the alpha level */
    iQ = (mng_uint8)((iB & iM) >> iS);
    iQ = (mng_uint8)(iQ + (iQ << 4));  /* expand to 8-bit by replication */

    *pOutrow = iQ;                     /* put in object buffer */

    pOutrow += 2;                      /* next pixel */
    iM >>=  4;
    iS -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A4, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_g8_a8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in object buffer */

    pOutrow += 2;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A8, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_jpeg_g8_a16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* only high-order byte! */

    pOutrow  += 2;                     /* next pixel */
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G8_A16, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8_a1 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0x80;
    }

    if (iB & iM)                       /* is it opaque ? */
      *pOutrow = 0xFF;                 /* opaque */
    else
      *pOutrow = 0x00;                 /* transparent */

    pOutrow += 4;                      /* next pixel */
    iM >>=  1;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A1, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8_a2 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xC0;
      iS = 6;
    }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
    {
      const mng_uint8  alpha_level[4] = { 0x00, 0x55, 0xAA, 0xFF};
      *pOutrow = alpha_level[((iB & iM) >> iS)] ;
    }
#else
    switch ((iB & iM) >> iS)           /* determine the alpha level */
    {
      case 0x03 : { *pOutrow = 0xFF; break; }
      case 0x02 : { *pOutrow = 0xAA; break; }
      case 0x01 : { *pOutrow = 0x55; break; }
      default   : { *pOutrow = 0x00; }
    }
#endif

    pOutrow += 4;                      /* next pixel */
    iM >>=  2;
    iS -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A2, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8_a4 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xF0;
      iS = 4;
    }
                                       /* get the alpha level */
    iQ = (mng_uint8)((iB & iM) >> iS);
    iQ = (mng_uint8)(iQ + (iQ << 4));  /* expand to 8-bit by replication */

    *pOutrow = iQ;                     /* put in object buffer */

    pOutrow += 4;                      /* next pixel */
    iM >>=  4;
    iS -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A4, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

mng_retcode mng_store_jpeg_rgb8_a8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* put in buffer */

    pOutrow += 4;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A8, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_jpeg_rgb8_a16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = *pWorkrow;              /* only high-order byte */

    pOutrow  += 4;                     /* next pixel */
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_RGB8_A16, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif

/* ************************************************************************** */

#ifdef MNG_SUPPORT_JPEG12
mng_retcode mng_store_jpeg_g12_a1 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 2;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0x80;
    }

    if (iB & iM)                       /* opaque ? */
      mng_put_uint16 (pOutrow, 0xFFFF);/* opaque */
    else
      mng_put_uint16 (pOutrow, 0x0000);/* transparent */

    pOutrow += 4;                      /* next pixel */
    iM >>=  1;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A1, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif /* MNG_SUPPORT_JPEG12 */

/* ************************************************************************** */

#ifdef MNG_SUPPORT_JPEG12
mng_retcode mng_store_jpeg_g12_a2 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 2;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xC0;
      iS = 6;
    }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
    {
      const mng_uint16  gray_level[4] = { 0x0000, 0x5555, 0xAAAA, 0xFFFF};
      mng_put_uint16 (pOutrow, gray_level[((iB & iM) >> iS)]) ;
    }
#else
    switch ((iB & iM) >> iS)           /* determine the gray level */
    {
      case 0x03 : { mng_put_uint16 (pOutrow, 0xFFFF); break; }
      case 0x02 : { mng_put_uint16 (pOutrow, 0xAAAA); break; }
      case 0x01 : { mng_put_uint16 (pOutrow, 0x5555); break; }
      default   : { mng_put_uint16 (pOutrow, 0x0000); }
    }
#endif

    pOutrow += 4;                      /* next pixel */
    iM >>=  2;
    iS -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A2, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif /* MNG_SUPPORT_JPEG12 */

/* ************************************************************************** */

#ifdef MNG_SUPPORT_JPEG12
mng_retcode mng_store_jpeg_g12_a4 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint16     iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 2;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    if (!iM)                           /* mask underflow ? */
    {
      iB = *pWorkrow;                  /* get next input-byte */
      pWorkrow++;
      iM = 0xF0;
      iS = 4;
    }
                                       /* get the gray level */
    iQ = (mng_uint16)((iB & iM) >> iS);
    iQ = (mng_uint16)(iQ + (iQ << 4)); /* expand to 16-bit by replication */
    iQ = (mng_uint16)(iQ + (iQ << 8));
                                       /* put in object buffer */
    mng_put_uint16 (pOutrow, iQ);

    pOutrow += 4;                      /* next pixel */
    iM >>=  4;
    iS -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A4, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif /* MNG_SUPPORT_JPEG12 */

/* ************************************************************************** */

#ifdef MNG_SUPPORT_JPEG12
mng_retcode mng_store_jpeg_g12_a8 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint16     iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 2;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iW = (mng_uint16)(*pWorkrow);      /* get input byte */
    iW = (mng_uint16)(iW + (iW << 8)); /* expand to 16-bit by replication */

    mng_put_uint16 (pOutrow, iW);      /* put in object buffer */

    pOutrow += 4;                      /* next pixel */
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A8, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif /* MNG_SUPPORT_JPEG12 */

/* ************************************************************************** */

#ifdef MNG_SUPPORT_JPEG12
#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_store_jpeg_g12_a16 (mng_datap pData)
{
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 2;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                                    /* copy it */
    mng_put_uint16 (pOutrow, mng_get_uint16 (pWorkrow));

    pOutrow  += 4;                     /* next pixel */
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_STORE_JPEG_G12_A16, MNG_LC_END);
#endif
                                       /* we've got one more row of alpha-samples */
  return mng_next_jpeg_alpharow (pData);
}
#endif
#endif /* MNG_SUPPORT_JPEG12 */

/* ************************************************************************** */

#endif /* MNG_INCLUDE_JNG */

#ifndef MNG_NO_DELTA_PNG
/* ************************************************************************** */
/* *                                                                        * */
/* * Delta-image row routines - apply the processed & uncompressed row-data * */
/* * onto the target "object"                                               * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_delta_g1 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
      }

      if (iB & iM)                     /* is it white ? */
        *pOutrow = 0xFF;               /* white */
      else
        *pOutrow = 0x00;               /* black */

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  1;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
      }

      if (iB & iM)                     /* invert if it is white ? */
        *pOutrow = (mng_uint8)(*pOutrow ^ 0xFF);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  1;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G1, MNG_LC_END);
#endif

  return mng_store_g1 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_g2 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
  const mng_uint8  level[4] = { 0x00, 0x55, 0xAA, 0xFF};
#endif

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
    *pOutrow = level[((iB & iM) >> iS)] ;
#else
    switch ((iB & iM) >> iS)           /* determine the alpha level */
    {
      case 0x03 : { *pOutrow = 0xFF; break; }
      case 0x02 : { *pOutrow = 0xAA; break; }
      case 0x01 : { *pOutrow = 0x55; break; }
      default   : { *pOutrow = 0x00; }
    }
#endif

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  2;
      iS -= 2;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
      *pOutrow = level[((*pOutrow >> 6) + ((iB & iM) >> iS)) & 0x03] ;
#else
      switch (((*pOutrow >> 6) + ((iB & iM) >> iS)) & 0x03)
      {
        case 0x03 : { *pOutrow = 0xFF; break; }
        case 0x02 : { *pOutrow = 0xAA; break; }
        case 0x01 : { *pOutrow = 0x55; break; }
        default   : { *pOutrow = 0x00; }
      }
#endif

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  2;
      iS -= 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G2, MNG_LC_END);
#endif

  return mng_store_g2 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_g4 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the gray level */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* expand to 8-bit by replication */
      iQ = (mng_uint8)(iQ + (iQ << 4));

      *pOutrow = iQ;                   /* put in object buffer */

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  4;
      iS -= 4;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the gray level */
      iQ = (mng_uint8)(((*pOutrow >> 4) + ((iB & iM) >> iS)) & 0x0F);
                                       /* expand to 8-bit by replication */
      iQ = (mng_uint8)(iQ + (iQ << 4));

      *pOutrow = iQ;                   /* put in object buffer */

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  4;
      iS -= 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G4, MNG_LC_END);
#endif

  return mng_store_g4 (pData);
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_delta_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = *pWorkrow;            /* put in object buffer */

      pOutrow += pData->iColinc;       /* next pixel */
      pWorkrow++;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      *pOutrow = (mng_uint8)(*pOutrow + *pWorkrow);

      pOutrow += pData->iColinc;       /* next pixel */
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G8, MNG_LC_END);
#endif

  return mng_store_g8 (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_g16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 1);
      pWorkrow += 2;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      mng_put_uint16 (pOutrow, (mng_uint16)(mng_get_uint16 (pOutrow ) +
                                            mng_get_uint16 (pWorkrow)   ));
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 1);
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G16, MNG_LC_END);
#endif

  return mng_store_g16 (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_delta_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
      *(pOutrow+2) = *(pWorkrow+2);
                                       /* next pixel */
      pOutrow  += (pData->iColinc * 3);
      pWorkrow += 3;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      *pOutrow     = (mng_uint8)(*pOutrow     + *pWorkrow    );
      *(pOutrow+1) = (mng_uint8)(*(pOutrow+1) + *(pWorkrow+1));
      *(pOutrow+2) = (mng_uint8)(*(pOutrow+2) + *(pWorkrow+2));
                                       /* next pixel */
      pOutrow  += (pData->iColinc * 3);
      pWorkrow += 3;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB8, MNG_LC_END);
#endif

  return mng_store_rgb8 (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
      *(pOutrow+2) = *(pWorkrow+2);
      *(pOutrow+3) = *(pWorkrow+3);
      *(pOutrow+4) = *(pWorkrow+4);
      *(pOutrow+5) = *(pWorkrow+5);
                                       /* next pixel */
      pOutrow  += (pData->iColinc * 6);
      pWorkrow += 6;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      mng_put_uint16 (pOutrow,   (mng_uint16)(mng_get_uint16 (pOutrow   ) +
                                              mng_get_uint16 (pWorkrow  )   ));
      mng_put_uint16 (pOutrow+2, (mng_uint16)(mng_get_uint16 (pOutrow+2 ) +
                                              mng_get_uint16 (pWorkrow+2)   ));
      mng_put_uint16 (pOutrow+4, (mng_uint16)(mng_get_uint16 (pOutrow+4 ) +
                                              mng_get_uint16 (pWorkrow+4)   ));
                                       /* next pixel */
      pOutrow  += (pData->iColinc * 6);
      pWorkrow += 6;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB16, MNG_LC_END);
#endif

  return mng_store_rgb16 (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_delta_idx1 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX1, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
      }

      if (iB & iM)                     /* put the right index value */
        *pOutrow = 1;
      else
        *pOutrow = 0;

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  1;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
      }

      if (iB & iM)                     /* invert if it is non-zero index */
        *pOutrow = (mng_uint8)(*pOutrow ^ 0x01);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  1;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX1, MNG_LC_END);
#endif

  return mng_store_idx1 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_idx2 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX2, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }
                                       /* put the index */
      *pOutrow = (mng_uint8)((iB & iM) >> iS);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  2;
      iS -= 2;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }
                                       /* calculate the index */
      *pOutrow = (mng_uint8)((*pOutrow + ((iB & iM) >> iS)) & 0x03);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  2;
      iS -= 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX2, MNG_LC_END);
#endif

  return mng_store_idx2 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_idx4 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX4, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* put the index */
      *pOutrow = (mng_uint8)((iB & iM) >> iS);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  4;
      iS -= 4;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* calculate the index */
      *pOutrow = (mng_uint8)((*pOutrow + ((iB & iM) >> iS)) & 0x0F);

      pOutrow += pData->iColinc;       /* next pixel */
      iM >>=  4;
      iS -= 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX4, MNG_LC_END);
#endif

  return mng_store_idx4 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_idx8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = *pWorkrow;            /* put in object buffer */

      pOutrow += pData->iColinc;       /* next pixel */
      pWorkrow++;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      *pOutrow = (mng_uint8)(*pOutrow + *pWorkrow);

      pOutrow += pData->iColinc;       /* next pixel */
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_IDX8, MNG_LC_END);
#endif

  return mng_store_idx8 (pData);
}

/* ************************************************************************** */

mng_retcode mng_delta_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 1);
      pWorkrow += 2;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      *pOutrow     = (mng_uint8)(*pOutrow     + *pWorkrow    );
      *(pOutrow+1) = (mng_uint8)(*(pOutrow+1) + *(pWorkrow+1));
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 1);
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8, MNG_LC_END);
#endif

  return mng_store_ga8 (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
      *(pOutrow+2) = *(pWorkrow+2);
      *(pOutrow+3) = *(pWorkrow+3);
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 2);
      pWorkrow += 4;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      mng_put_uint16 (pOutrow,   (mng_uint16)(mng_get_uint16 (pOutrow   ) +
                                              mng_get_uint16 (pWorkrow  )   ));
      mng_put_uint16 (pOutrow+2, (mng_uint16)(mng_get_uint16 (pOutrow+2 ) +
                                              mng_get_uint16 (pWorkrow+2)   ));
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 2);
      pWorkrow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16, MNG_LC_END);
#endif

  return mng_store_ga16 (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_delta_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;        /* put in object buffer */
      *(pOutrow+1) = *(pWorkrow+1);
      *(pOutrow+2) = *(pWorkrow+2);
      *(pOutrow+3) = *(pWorkrow+3);
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 2);
      pWorkrow += 4;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      *pOutrow     = (mng_uint8)(*pOutrow     + *pWorkrow    );
      *(pOutrow+1) = (mng_uint8)(*(pOutrow+1) + *(pWorkrow+1));
      *(pOutrow+2) = (mng_uint8)(*(pOutrow+2) + *(pWorkrow+2));
      *(pOutrow+3) = (mng_uint8)(*(pOutrow+3) + *(pWorkrow+3));
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 2);
      pWorkrow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8, MNG_LC_END);
#endif

  return mng_store_rgba8 (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pDeltaImage)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pOutrow  = pBuf->pImgdata + (pData->iRow         * pBuf->iRowsize   ) +
                              (pData->iDeltaBlocky * pBuf->iRowsize   ) +
                              (pData->iCol         * pBuf->iSamplesize) +
                              (pData->iDeltaBlockx * pBuf->iSamplesize);
                                       /* pixel replace ? */
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      MNG_COPY (pOutrow, pWorkrow, 8); /* put in object buffer */
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 3);
      pWorkrow += 8;
    }
  }
  else
  {                                    /* pixel add ! */
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* add to object buffer */
      mng_put_uint16 (pOutrow,   (mng_uint16)(mng_get_uint16 (pOutrow   ) +
                                              mng_get_uint16 (pWorkrow  )   ));
      mng_put_uint16 (pOutrow+2, (mng_uint16)(mng_get_uint16 (pOutrow+2 ) +
                                              mng_get_uint16 (pWorkrow+2)   ));
      mng_put_uint16 (pOutrow+4, (mng_uint16)(mng_get_uint16 (pOutrow+4 ) +
                                              mng_get_uint16 (pWorkrow+4)   ));
      mng_put_uint16 (pOutrow+6, (mng_uint16)(mng_get_uint16 (pOutrow+6 ) +
                                              mng_get_uint16 (pWorkrow+6)   ));
                                       /* next pixel */
      pOutrow  += (pData->iColinc << 3);
      pWorkrow += 8;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16, MNG_LC_END);
#endif

  return mng_store_rgba16 (pData);
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Delta-image row routines - apply the source row onto the target        * */
/* *                                                                        * */
/* ************************************************************************** */

mng_retcode mng_delta_g1_g1 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G1_G1, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0x01);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G1_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_g2_g2 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G2_G2, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0x03);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G2_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_g4_g4 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G4_G4, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0x0F);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G4_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_g8_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G8_G8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G8_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_g16_g16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G16_G16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, (pData->iRowsamples << 1));
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow, (mng_uint16)((mng_get_uint16 (pOutrow) +
                                             mng_get_uint16 (pWorkrow)) & 0xFFFF));

      pOutrow  += 2;
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_G16_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* MNG_NO_DELTA_PNG */

/* ************************************************************************** */

mng_retcode mng_delta_rgb8_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB8_RGB8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples * 3);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples*3; iX > 0; iX--)
#else
    for (iX = 0; iX < (pData->iRowsamples * 3); iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB8_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgb16_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB16_RGB16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, (pData->iRowsamples * 6));
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow,   (mng_uint16)((mng_get_uint16 (pOutrow  ) +
                                               mng_get_uint16 (pWorkrow  )) & 0xFFFF));
      mng_put_uint16 (pOutrow+2, (mng_uint16)((mng_get_uint16 (pOutrow+2) +
                                               mng_get_uint16 (pWorkrow+2)) & 0xFFFF));
      mng_put_uint16 (pOutrow+4, (mng_uint16)((mng_get_uint16 (pOutrow+4) +
                                               mng_get_uint16 (pWorkrow+4)) & 0xFFFF));

      pOutrow  += 6;
      pWorkrow += 6;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGB16_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_DELTA_PNG
mng_retcode mng_delta_ga8_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_GA8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples << 1);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = (pData->iRowsamples<<1); iX > 0; iX--)
#else
    for (iX = 0; iX < (pData->iRowsamples << 1); iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_ga8_g8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_G8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = *pWorkrow;

      pOutrow += 2;
      pWorkrow++;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow += 2;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_ga8_a8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_A8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 1;

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = *pWorkrow;

      pOutrow += 2;
      pWorkrow++;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow += 2;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA8_A8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_ga16_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_GA16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, (pData->iRowsamples << 2));
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow,   (mng_uint16)((mng_get_uint16 (pOutrow  ) +
                                               mng_get_uint16 (pWorkrow  )) & 0xFFFF));
      mng_put_uint16 (pOutrow+2, (mng_uint16)((mng_get_uint16 (pOutrow+2) +
                                               mng_get_uint16 (pWorkrow+2)) & 0xFFFF));

      pOutrow  += 4;
      pWorkrow += 4;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_ga16_g16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_G16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow, mng_get_uint16 (pWorkrow));

      pOutrow  += 4;
      pWorkrow += 2;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow, (mng_uint16)((mng_get_uint16 (pOutrow) +
                                             mng_get_uint16 (pWorkrow)) & 0xFFFF));

      pOutrow  += 4;
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_ga16_a16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_A16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow+2, mng_get_uint16 (pWorkrow));

      pOutrow  += 4;
      pWorkrow += 2;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow+2, (mng_uint16)((mng_get_uint16 (pOutrow+2) +
                                               mng_get_uint16 (pWorkrow)) & 0xFFFF));

      pOutrow  += 4;
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_GA16_A16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* MNG_NO_DELTA_PNG */

/* ************************************************************************** */

mng_retcode mng_delta_rgba8_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_RGBA8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, pData->iRowsamples << 2);
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = (pData->iRowsamples << 2); iX > 0; iX--)
#else
    for (iX = 0; iX < (pData->iRowsamples << 2); iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow++;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_DELTA_PNG
mng_retcode mng_delta_rgba8_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_RGB8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = *pWorkrow;
      *(pOutrow+1) = *(pWorkrow+1);
      *(pOutrow+2) = *(pWorkrow+2);

      pOutrow  += 4;
      pWorkrow += 3;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow     = (mng_uint8)(((mng_uint16)*pOutrow     +
                                  (mng_uint16)*pWorkrow    ) & 0xFF);
      *(pOutrow+1) = (mng_uint8)(((mng_uint16)*(pOutrow+1) +
                                  (mng_uint16)*(pWorkrow+1)) & 0xFF);
      *(pOutrow+2) = (mng_uint8)(((mng_uint16)*(pOutrow+2) +
                                  (mng_uint16)*(pWorkrow+2)) & 0xFF);

      pOutrow  += 4;
      pWorkrow += 3;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_delta_rgba8_a8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_A8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize) + 3;

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = *pWorkrow;

      pOutrow += 4;
      pWorkrow++;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pOutrow = (mng_uint8)(((mng_uint16)*pOutrow +
                              (mng_uint16)*pWorkrow) & 0xFF);

      pOutrow += 4;
      pWorkrow++;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA8_A8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_NO_DELTA_PNG */

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgba16_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_RGBA16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if ((pData->iDeltatype == MNG_DELTATYPE_REPLACE          ) ||
      (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELREPLACE)    )
  {
    MNG_COPY (pOutrow, pWorkrow, (pData->iRowsamples << 3));
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKPIXELADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow,   (mng_uint16)((mng_get_uint16 (pOutrow  ) +
                                               mng_get_uint16 (pWorkrow  )) & 0xFFFF));
      mng_put_uint16 (pOutrow+2, (mng_uint16)((mng_get_uint16 (pOutrow+2) +
                                               mng_get_uint16 (pWorkrow+2)) & 0xFFFF));
      mng_put_uint16 (pOutrow+4, (mng_uint16)((mng_get_uint16 (pOutrow+4) +
                                               mng_get_uint16 (pWorkrow+4)) & 0xFFFF));
      mng_put_uint16 (pOutrow+6, (mng_uint16)((mng_get_uint16 (pOutrow+6) +
                                               mng_get_uint16 (pWorkrow+6)) & 0xFFFF));

      pOutrow  += 8;
      pWorkrow += 8;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_DELTA_PNG
#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgba16_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_RGB16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow,   mng_get_uint16 (pWorkrow  ));
      mng_put_uint16 (pOutrow+2, mng_get_uint16 (pWorkrow+2));
      mng_put_uint16 (pOutrow+4, mng_get_uint16 (pWorkrow+4));

      pOutrow  += 8;
      pWorkrow += 6;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKCOLORADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow,   (mng_uint16)((mng_get_uint16 (pOutrow  ) +
                                               mng_get_uint16 (pWorkrow  )) & 0xFFFF));
      mng_put_uint16 (pOutrow+2, (mng_uint16)((mng_get_uint16 (pOutrow+2) +
                                               mng_get_uint16 (pWorkrow+2)) & 0xFFFF));
      mng_put_uint16 (pOutrow+4, (mng_uint16)((mng_get_uint16 (pOutrow+4) +
                                               mng_get_uint16 (pWorkrow+4)) & 0xFFFF));

      pOutrow  += 8;
      pWorkrow += 6;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_delta_rgba16_a16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_A16, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAREPLACE)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow+6, mng_get_uint16 (pWorkrow));

      pOutrow  += 8;
      pWorkrow += 2;
    }
  }
  else
  if (pData->iDeltatype == MNG_DELTATYPE_BLOCKALPHAADD)
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      mng_put_uint16 (pOutrow+6, (mng_uint16)((mng_get_uint16 (pOutrow+6) +
                                               mng_get_uint16 (pWorkrow)) & 0xFFFF));

      pOutrow  += 8;
      pWorkrow += 2;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DELTA_RGBA16_A16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* MNG_NO_DELTA_PNG */

/* ************************************************************************** */
/* *                                                                        * */
/* * Delta-image row routines - scale the delta to bitdepth of target       * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_NO_DELTA_PNG
#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_scale_g1_g2 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G2, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 1);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g1_g4 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G4, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 3);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g1_g8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 7);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g1_g16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + (pData->iRowsamples - 1);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 1);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + pData->iRowsamples - 1); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 1)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+1) = 0;
    *pOutrow     = (mng_uint8)(*pWorkrow << 7);

    pWorkrow--;
    pOutrow -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G1_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_scale_g2_g4 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G4, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 2);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g2_g8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 6);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g2_g16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + (pData->iRowsamples - 1);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 1);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + pData->iRowsamples - 1); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 1)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+1) = 0;
    *pOutrow     = (mng_uint8)(*pWorkrow << 6);

    pWorkrow--;
    pOutrow -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_scale_g4_g8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow << 4);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g4_g16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + (pData->iRowsamples - 1);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 1);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + pData->iRowsamples - 1); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 1)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+1) = 0;
    *pOutrow     = (mng_uint8)(*pWorkrow << 4);

    pWorkrow--;
    pOutrow -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g8_g16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + (pData->iRowsamples - 1);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 1);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + pData->iRowsamples - 1); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 1)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+1) = 0;
    *pOutrow     = *pWorkrow;

    pWorkrow--;
    pOutrow -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_ga8_ga16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_GA8_GA16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + ((pData->iRowsamples - 1) << 1);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 2);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + ((pData->iRowsamples - 1) << 1)); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 2)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+3) = 0;
    *(pOutrow+2) = *(pWorkrow+1);
    *(pOutrow+1) = 0;
    *pOutrow     = *pWorkrow;

    pWorkrow -= 2;
    pOutrow  -= 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_GA8_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_rgb8_rgb16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGB8_RGB16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + (3 * (pData->iRowsamples - 1));
  pOutrow  = pOutrow  + (6 * (pData->iRowsamples - 1));
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + 3 * (pData->iRowsamples - 1)); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + 6 * (pData->iRowsamples - 1)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+5) = 0;
    *(pOutrow+4) = *(pWorkrow+2);
    *(pOutrow+3) = 0;
    *(pOutrow+2) = *(pWorkrow+1);
    *(pOutrow+1) = 0;
    *pOutrow     = *pWorkrow;

    pWorkrow -= 3;
    pOutrow  -= 6;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGB8_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_rgba8_rgba16 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGBA8_RGBA16, MNG_LC_START);
#endif

  pWorkrow = pWorkrow + ((pData->iRowsamples - 1) << 2);
  pOutrow  = pOutrow  + ((pData->iRowsamples - 1) << 3);
/*  pWorkrow = (mng_uint8p)((mng_uint32)pWorkrow + ((pData->iRowsamples - 1) << 2)); */
/*  pOutrow  = (mng_uint8p)((mng_uint32)pOutrow  + ((pData->iRowsamples - 1) << 3)); */

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *(pOutrow+7) = 0;
    *(pOutrow+6) = *(pWorkrow+3);
    *(pOutrow+5) = 0;
    *(pOutrow+4) = *(pWorkrow+2);
    *(pOutrow+3) = 0;
    *(pOutrow+2) = *(pWorkrow+1);
    *(pOutrow+1) = 0;
    *pOutrow     = *pWorkrow;

    pWorkrow -= 4;
    pOutrow  -= 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGBA8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_scale_g2_g1 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G1, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 1);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G2_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g4_g1 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G1, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 3);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g8_g1 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G1, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 7);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g16_g1 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G1, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 15);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_scale_g4_g2 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G2, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 2);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G4_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_g8_g2 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G2, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 6);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g16_g2 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G2, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 14);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_scale_g8_g4 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G4, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pWorkrow = (mng_uint8)(*pWorkrow >> 4);
    pWorkrow++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G8_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_scale_g16_g4 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G4, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 12);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_scale_g16_g8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_G16_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_ga16_ga8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_GA16_GA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_GA16_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_rgb16_rgb8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGB16_RGB8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGB16_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_scale_rgba16_rgba8 (mng_datap pData)
{
  mng_uint8p pWorkrow = pData->pRGBArow;
  mng_uint8p pOutrow  = pData->pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGBA16_RGBA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
    *pOutrow = (mng_uint8)(mng_get_uint16 (pWorkrow) >> 8);
    pOutrow++;
    pWorkrow += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_SCALE_RGBA16_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Delta-image bit routines - promote bit_depth                           * */
/* *                                                                        * */
/* ************************************************************************** */

mng_uint8 mng_promote_replicate_1_2 (mng_uint8 iB)
{
  return (mng_uint8)((iB << 1) | iB);
}

/* ************************************************************************** */

mng_uint8 mng_promote_replicate_1_4 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 1) + iB);
  return (mng_uint8)((iB << 2) + iB);
}

/* ************************************************************************** */

mng_uint8 mng_promote_replicate_1_8 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 1) + iB);
  iB = (mng_uint8)((iB << 2) + iB);
  return (mng_uint8)((iB << 4) + iB);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_replicate_1_16 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 1) + iB);
  iB = (mng_uint8)((iB << 2) + iB);
  iB = (mng_uint8)((iB << 4) + iB);
  return (mng_uint16)(((mng_uint16)iB << 8) + (mng_uint16)iB);
}
#endif

/* ************************************************************************** */

mng_uint8 mng_promote_replicate_2_4 (mng_uint8 iB)
{
  return (mng_uint8)((iB << 2) + iB);
}

/* ************************************************************************** */

mng_uint8 mng_promote_replicate_2_8 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 2) + iB);
  return (mng_uint8)((iB << 4) + iB);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_replicate_2_16 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 2) + iB);
  iB = (mng_uint8)((iB << 4) + iB);
  return (mng_uint16)(((mng_uint16)iB << 8) + (mng_uint16)iB);
}
#endif

/* ************************************************************************** */

mng_uint8 mng_promote_replicate_4_8 (mng_uint8 iB)
{
  return (mng_uint8)((iB << 4) + iB);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_replicate_4_16 (mng_uint8 iB)
{
  iB = (mng_uint8)((iB << 4) + iB);
  return (mng_uint16)(((mng_uint16)iB << 8) + (mng_uint16)iB);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_replicate_8_16 (mng_uint8 iB)
{
  return (mng_uint16)(((mng_uint16)iB << 8) + (mng_uint16)iB);
}
#endif

/* ************************************************************************** */

#if !defined(MNG_NO_DELTA_PNG)
mng_uint8 mng_promote_zerofill_1_2 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 1);
}

/* ************************************************************************** */

mng_uint8 mng_promote_zerofill_1_4 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 3);
}

/* ************************************************************************** */

mng_uint8 mng_promote_zerofill_1_8 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 7);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_zerofill_1_16 (mng_uint8 iB)
{
  return (mng_uint16)((mng_uint16)iB << 15);
}
#endif

/* ************************************************************************** */

mng_uint8 mng_promote_zerofill_2_4 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 2);
}

/* ************************************************************************** */

mng_uint8 mng_promote_zerofill_2_8 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 6);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_zerofill_2_16 (mng_uint8 iB)
{
  return (mng_uint16)((mng_uint16)iB << 14);
}
#endif

/* ************************************************************************** */

mng_uint8 mng_promote_zerofill_4_8 (mng_uint8 iB)
{
  return (mng_uint8)(iB << 4);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_zerofill_4_16 (mng_uint8 iB)
{
  return (mng_uint16)((mng_uint16)iB << 12);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 mng_promote_zerofill_8_16 (mng_uint8 iB)
{
  return (mng_uint16)((mng_uint16)iB << 8);
}
#endif
#endif /* MNG_NO_DELTA_PNG */

/* ************************************************************************** */
/* *                                                                        * */
/* * Delta-image row routines - promote color_type                          * */
/* *                                                                        * */
/* ************************************************************************** */

#if !defined(MNG_NO_DELTA_PNG) || !defined(MNG_SKIPCHUNK_PAST) || !defined(MNG_SKIPCHUNK_MAGN)
mng_retcode mng_promote_g8_g8 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint8  iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_G8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
    if (pData->fPromBitdepth)      /* bitdepth promoted ? */
      iB = ((mng_bitdepth_8)pData->fPromBitdepth) (iB);
    *pDstline = iB;

    pSrcline++;
    pDstline++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g8_g16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint16 iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_G16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = ((mng_bitdepth_16)pData->fPromBitdepth) (*pSrcline);

    *pDstline     = (mng_uint8)(iW >> 8);
    *(pDstline+1) = (mng_uint8)(iW && 0xFF);

    pSrcline++;
    pDstline += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_promote_g16_g16 (mng_datap pData)
{
  mng_uint16p pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_G16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    *pDstline = *pSrcline;
    pSrcline++;
    pDstline++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_g8_ga8 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_GA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iB != pBuf->iTRNSgray))
      *(pDstline+1) = 0xFF;

    if (pData->fPromBitdepth)      /* bitdepth promoted ? */
      iB = ((mng_bitdepth_8)pData->fPromBitdepth) (iB);

    *pDstline = iB;

    pSrcline++;
    pDstline += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g8_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;
  mng_uint16     iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_GA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iB != pBuf->iTRNSgray))
    {
      *(pDstline+2) = 0xFF;
      *(pDstline+3) = 0xFF;
    }

    iW = ((mng_bitdepth_16)pData->fPromBitdepth) (iB);

    *pDstline     = (mng_uint8)(iW >> 8);
    *(pDstline+1) = (mng_uint8)(iW && 0xFF);

    pSrcline++;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g16_ga16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint16p    pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p    pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint16     iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_GA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iW != pBuf->iTRNSgray))
      *(pDstline+1) = 0xFFFF;

    *pDstline = iW;

    pSrcline++;
    pDstline += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_g8_rgb8 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint8  iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGB8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;

    if (pData->fPromBitdepth)      /* bitdepth promoted ? */
      iB = ((mng_bitdepth_8)pData->fPromBitdepth) (iB);

    *pDstline     = iB;
    *(pDstline+1) = iB;
    *(pDstline+2) = iB;

    pSrcline++;
    pDstline += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g8_rgb16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint8  iB;
  mng_uint16 iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGB16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
    iW = ((mng_bitdepth_16)pData->fPromBitdepth) (iB);

    iB            = (mng_uint8)(iW >> 8);
    *pDstline     = iB;
    *(pDstline+2) = iB;
    *(pDstline+4) = iB;
    iB            = (mng_uint8)(iW && 0xFF);
    *(pDstline+1) = iB;
    *(pDstline+3) = iB;
    *(pDstline+5) = iB;

    pSrcline++;
    pDstline += 6;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g16_rgb16 (mng_datap pData)
{
  mng_uint16p pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32  iX;
  mng_uint16  iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_RGB16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = *pSrcline;

    *pDstline     = iW;
    *(pDstline+1) = iW;
    *(pDstline+2) = iW;

    pSrcline++;
    pDstline += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_g8_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGBA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iB != pBuf->iTRNSgray))
      *(pDstline+3) = 0xFF;

    if (pData->fPromBitdepth)      /* bitdepth promoted ? */
      iB = ((mng_bitdepth_8)pData->fPromBitdepth) (iB);

    *pDstline     = iB;
    *(pDstline+1) = iB;
    *(pDstline+2) = iB;

    pSrcline++;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g8_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;
  mng_uint16     iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iB != pBuf->iTRNSgray))
    {
      *(pDstline+6) = 0xFF;
      *(pDstline+7) = 0xFF;
    }

    iW            = ((mng_bitdepth_16)pData->fPromBitdepth) (iB);

    iB            = (mng_uint8)(iW >> 8);
    *pDstline     = iB;
    *(pDstline+2) = iB;
    *(pDstline+4) = iB;
    iB            = (mng_uint8)(iW && 0xFF);
    *(pDstline+1) = iB;
    *(pDstline+3) = iB;
    *(pDstline+5) = iB;;

    pSrcline++;
    pDstline += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_g16_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint16p    pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p    pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint16     iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = *pSrcline;
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || (iW != pBuf->iTRNSgray))
      *(pDstline+3) = 0xFFFF;

    *pDstline     = iW;
    *(pDstline+1) = iW;
    *(pDstline+2) = iW;

    pSrcline++;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_G16_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_ga8_ga16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint16 iW;
  mng_uint16 iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_GA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = ((mng_bitdepth_16)pData->fPromBitdepth) (*pSrcline);
    iA = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+1));

    *pDstline     = (mng_uint8)(iW >> 8);
    *(pDstline+1) = (mng_uint8)(iW && 0xFF);
    *(pDstline+2) = (mng_uint8)(iA >> 8);
    *(pDstline+3) = (mng_uint8)(iA && 0xFF);

    pSrcline += 2;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_ga8_rgba8 (mng_datap pData)
{
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;
  mng_uint8      iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_RGBA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;
    iA = *(pSrcline+1);

    *pDstline     = iB;
    *(pDstline+1) = iB;
    *(pDstline+2) = iB;
    *(pDstline+3) = iA;

    pSrcline += 2;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_ga8_rgba16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint8  iB;
  mng_uint16 iW;
  mng_uint16 iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = ((mng_bitdepth_16)pData->fPromBitdepth) (*pSrcline);
    iA = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+1));

    iB            = (mng_uint8)(iW >> 8);
    *pDstline     = iB;
    *(pDstline+2) = iB;
    *(pDstline+4) = iB;
    iB            = (mng_uint8)(iW && 0xFF);
    *(pDstline+1) = iB;
    *(pDstline+3) = iB;
    *(pDstline+5) = iB;
    *(pDstline+6) = (mng_uint8)(iA >> 8);
    *(pDstline+7) = (mng_uint8)(iA && 0xFF);

    pSrcline += 2;
    pDstline += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_ga16_rgba16 (mng_datap pData)
{
  mng_uint16p pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint16 iW;
  mng_uint16 iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA16_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iW = *pSrcline;
    iA = *(pSrcline+1);

    *pDstline     = iW;
    *(pDstline+1) = iW;
    *(pDstline+2) = iW;
    *(pDstline+3) = iA;

    pSrcline += 2;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_GA16_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_rgb8_rgb16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint16 iR;
  mng_uint16 iG;
  mng_uint16 iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGB16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iR            = ((mng_bitdepth_16)pData->fPromBitdepth) (*pSrcline);
    iG            = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+1));
    iB            = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+2));

    *pDstline     = (mng_uint8)(iR >> 8);
    *(pDstline+1) = (mng_uint8)(iR && 0xFF);
    *(pDstline+2) = (mng_uint8)(iG >> 8);
    *(pDstline+3) = (mng_uint8)(iG && 0xFF);
    *(pDstline+4) = (mng_uint8)(iB >> 8);
    *(pDstline+5) = (mng_uint8)(iB && 0xFF);

    pSrcline += 3;
    pDstline += 6;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_rgb8_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iR;
  mng_uint8      iG;
  mng_uint8      iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGBA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iR = *pSrcline;
    iG = *(pSrcline+1);
    iB = *(pSrcline+2);
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iR != pBuf->iTRNSred) ||
        ((mng_uint16)iG != pBuf->iTRNSgreen) || ((mng_uint16)iB != pBuf->iTRNSblue))
      *(pDstline+3) = 0xFF;

    *pDstline     = iR;
    *(pDstline+1) = iG;
    *(pDstline+2) = iB;

    pSrcline += 3;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_rgb8_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iR;
  mng_uint8      iG;
  mng_uint8      iB;
  mng_uint16     iRw;
  mng_uint16     iGw;
  mng_uint16     iBw;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iR = *pSrcline;
    iG = *(pSrcline+1);
    iB = *(pSrcline+2);
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || ((mng_uint16)iR != pBuf->iTRNSred) ||
        ((mng_uint16)iG != pBuf->iTRNSgreen) || ((mng_uint16)iB != pBuf->iTRNSblue))
    {
      *(pDstline+6) = 0xFF;
      *(pDstline+7) = 0xFF;
    }

    iRw           = ((mng_bitdepth_16)pData->fPromBitdepth) (iR);
    iGw           = ((mng_bitdepth_16)pData->fPromBitdepth) (iG);
    iBw           = ((mng_bitdepth_16)pData->fPromBitdepth) (iB);

    *pDstline     = (mng_uint8)(iRw >> 8);
    *(pDstline+1) = (mng_uint8)(iRw && 0xFF);
    *(pDstline+2) = (mng_uint8)(iGw >> 8);
    *(pDstline+3) = (mng_uint8)(iGw && 0xFF);
    *(pDstline+4) = (mng_uint8)(iBw >> 8);
    *(pDstline+5) = (mng_uint8)(iBw && 0xFF);

    pSrcline += 3;
    pDstline += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_rgb16_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint16p    pSrcline = (mng_uint16p)pData->pPromSrc;
  mng_uint16p    pDstline = (mng_uint16p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint16     iR;
  mng_uint16     iG;
  mng_uint16     iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB16_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iR = *pSrcline;
    iG = *(pSrcline+1);
    iB = *(pSrcline+2);
                                   /* no cheap transparency ? */
    if ((!pBuf->bHasTRNS) || (iR != pBuf->iTRNSred) ||
        (iG != pBuf->iTRNSgreen) || (iB != pBuf->iTRNSblue))
      *(pDstline+3) = 0xFFFF;

    *pDstline     = iR;
    *(pDstline+1) = iG;
    *(pDstline+2) = iB;

    pSrcline += 3;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGB16_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_idx8_rgb8 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGB8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;

    if ((mng_uint32)iB < pBuf->iPLTEcount)
    {
      *pDstline     = pBuf->aPLTEentries [iB].iRed;
      *(pDstline+1) = pBuf->aPLTEentries [iB].iGreen;
      *(pDstline+2) = pBuf->aPLTEentries [iB].iBlue;
    }

    pSrcline++;
    pDstline += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_idx8_rgb16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iN;
  mng_uint16     iR;
  mng_uint16     iG;
  mng_uint16     iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGB16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iN = *pSrcline;

    if ((mng_uint32)iN < pBuf->iPLTEcount)
    {
      iR              = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iRed);
      iG              = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iGreen);
      iB              = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iBlue);
      *pDstline       = (mng_uint8)(iR >> 8);
      *(pDstline+1)   = (mng_uint8)(iR && 0xFF);
      *(pDstline+2)   = (mng_uint8)(iG >> 8);
      *(pDstline+3)   = (mng_uint8)(iG && 0xFF);
      *(pDstline+4)   = (mng_uint8)(iB >> 8);
      *(pDstline+5)   = (mng_uint8)(iB && 0xFF);
    }

    pSrcline++;
    pDstline += 6;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_promote_idx8_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iB;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGBA8, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iB = *pSrcline;

    if ((mng_uint32)iB < pBuf->iPLTEcount)
    {
      *pDstline       = pBuf->aPLTEentries [iB].iRed;
      *(pDstline+1)   = pBuf->aPLTEentries [iB].iGreen;
      *(pDstline+2)   = pBuf->aPLTEentries [iB].iBlue;

      if ((pBuf->bHasTRNS) && ((mng_uint32)iB < pBuf->iTRNScount))
        *(pDstline+3) = pBuf->aTRNSentries [iB];
      else
        *(pDstline+3) = 0xFF;
    }

    pSrcline++;
    pDstline += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_promote_idx8_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf     = (mng_imagedatap)pData->pPromBuf;
  mng_uint8p     pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p     pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32     iX;
  mng_uint8      iN;
  mng_uint16     iR;
  mng_uint16     iG;
  mng_uint16     iB;
  mng_uint16     iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iN = *pSrcline;

    if ((mng_uint32)iN < pBuf->iPLTEcount)
    {
      iR            = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iRed);
      iG            = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iGreen);
      iB            = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aPLTEentries [iN].iBlue);

      if ((pBuf->bHasTRNS) && ((mng_uint32)iN < pBuf->iTRNScount))
        iA          = ((mng_bitdepth_16)pData->fPromBitdepth) (pBuf->aTRNSentries [iN]);
      else
        iA          = 0xFFFF;

      *pDstline     = (mng_uint8)(iR >> 8);
      *(pDstline+1) = (mng_uint8)(iR && 0xFF);
      *(pDstline+2) = (mng_uint8)(iG >> 8);
      *(pDstline+3) = (mng_uint8)(iG && 0xFF);
      *(pDstline+4) = (mng_uint8)(iB >> 8);
      *(pDstline+5) = (mng_uint8)(iB && 0xFF);
      *(pDstline+6) = (mng_uint8)(iA >> 8);
      *(pDstline+7) = (mng_uint8)(iA && 0xFF);
    }

    pSrcline++;
    pDstline += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_IDX8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_promote_rgba8_rgba16 (mng_datap pData)
{
  mng_uint8p pSrcline = (mng_uint8p)pData->pPromSrc;
  mng_uint8p pDstline = (mng_uint8p)pData->pPromDst;
  mng_uint32 iX;
  mng_uint16 iR;
  mng_uint16 iG;
  mng_uint16 iB;
  mng_uint16 iA;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGBA8_RGBA16, MNG_LC_START);
#endif

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iPromWidth; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iPromWidth; iX++)
#endif
  {
    iR            = ((mng_bitdepth_16)pData->fPromBitdepth) (*pSrcline);
    iG            = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+1));
    iB            = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+2));
    iA            = ((mng_bitdepth_16)pData->fPromBitdepth) (*(pSrcline+3));

    *pDstline     = (mng_uint8)(iR >> 8);
    *(pDstline+1) = (mng_uint8)(iR && 0xFF);
    *(pDstline+2) = (mng_uint8)(iG >> 8);
    *(pDstline+3) = (mng_uint8)(iG && 0xFF);
    *(pDstline+4) = (mng_uint8)(iB >> 8);
    *(pDstline+5) = (mng_uint8)(iB && 0xFF);
    *(pDstline+6) = (mng_uint8)(iA >> 8);
    *(pDstline+7) = (mng_uint8)(iA && 0xFF);

    pSrcline += 4;
    pDstline += 8;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROMOTE_RGBA8_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* !defined(MNG_NO_DELTA_PNG) || !defined(MNG_SKIPCHUNK_PAST) || !defined(MNG_SKIPCHUNK_MAGN) */

/* ************************************************************************** */
/* *                                                                        * */
/* * Row processing routines - convert uncompressed data from zlib to       * */
/* * managable row-data which serves as input to the color-management       * */
/* * routines                                                               * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_process_g1 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G1, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
    if (pBuf->iTRNSgray)               /* white transparent ? */
    {
#ifdef MNG_DECREMENT_LOOPS
      for (iX = pData->iRowsamples; iX > 0; iX--)
#else
      for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
      {
        if (!iM)                       /* mask underflow ? */
        {
          iB = *pWorkrow;              /* get next input-byte */
          pWorkrow++;
          iM = 0x80;
        }

        if (iB & iM)                   /* is it white ? */
                                       /* transparent ! */
          mng_put_uint32 (pRGBArow, 0x00000000);
        else                           /* opaque black */
          mng_put_uint32 (pRGBArow, 0x000000FF);

        pRGBArow += 4;                 /* next pixel */
        iM >>=  1;
      }
    }
    else                               /* black transparent */
    {
#ifdef MNG_DECREMENT_LOOPS
      for (iX = pData->iRowsamples; iX > 0; iX--)
#else
      for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
      {
        if (!iM)                       /* mask underflow ? */
        {
          iB = *pWorkrow;              /* get next input-byte */
          pWorkrow++;
          iM = 0x80;
        }

        if (iB & iM)                   /* is it white ? */
                                       /* opaque white */
          mng_put_uint32 (pRGBArow, 0xFFFFFFFF);
        else                           /* transparent */
          mng_put_uint32 (pRGBArow, 0x00000000);

        pRGBArow += 4;                 /* next pixel */
        iM >>=  1;
      }
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else                                 /* no transparency */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
      }

      if (iB & iM)                     /* is it white ? */
                                       /* opaque white */
        mng_put_uint32 (pRGBArow, 0xFFFFFFFF);
      else                             /* opaque black */
        mng_put_uint32 (pRGBArow, 0x000000FF);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  1;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_process_g2 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;
#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
  const mng_uint32  level[4] = { 0x000000FF, 0x555555FF,
          0xAAAAAAFF, 0xFFFFFFFF};
#endif

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G2, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }
                                       /* determine gray level */
      iQ = (mng_uint8)((iB & iM) >> iS);

      if (iQ == pBuf->iTRNSgray)       /* transparent ? */
        mng_put_uint32 (pRGBArow, 0x00000000);
      else
      {
#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
        mng_put_uint32 (pRGBArow, level[iQ]);
#else
        switch (iQ)                    /* determine the gray level */
        {
          case 0x03 : { mng_put_uint32 (pRGBArow, 0xFFFFFFFF); break; }
          case 0x02 : { mng_put_uint32 (pRGBArow, 0xAAAAAAFF); break; }
          case 0x01 : { mng_put_uint32 (pRGBArow, 0x555555FF); break; }
          default   : { mng_put_uint32 (pRGBArow, 0x000000FF); }
        }
#endif
      }

      pRGBArow += 4;                   /* next pixel */
      iM >>=  2;
      iS -= 2;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }

#ifdef MNG_OPTIMIZE_FOOTPRINT_SWITCH
      mng_put_uint32 (pRGBArow, level[((iB & iM) >> iS)] );
#else
      switch ((iB & iM) >> iS)         /* determine the gray level */
      {
        case 0x03 : { mng_put_uint32 (pRGBArow, 0xFFFFFFFF); break; }
        case 0x02 : { mng_put_uint32 (pRGBArow, 0xAAAAAAFF); break; }
        case 0x01 : { mng_put_uint32 (pRGBArow, 0x555555FF); break; }
        default   : { mng_put_uint32 (pRGBArow, 0x000000FF); }
      }
#endif

      pRGBArow += 4;                   /* next pixel */
      iM >>=  2;
      iS -= 2;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_process_g4 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G4, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the gray level */
      iQ = (mng_uint8)((iB & iM) >> iS);

      if (iQ == pBuf->iTRNSgray)       /* transparent ? */
      {
        *pRGBArow     = 0;             /* put in intermediate row */
        *(pRGBArow+1) = 0;
        *(pRGBArow+2) = 0;
        *(pRGBArow+3) = 0;
      }
      else
      {                                /* expand to 8-bit by replication */
        iQ = (mng_uint8)(iQ + (iQ << 4));

        *pRGBArow     = iQ;            /* put in intermediate row */
        *(pRGBArow+1) = iQ;
        *(pRGBArow+2) = iQ;
        *(pRGBArow+3) = 0xFF;
      }

      pRGBArow += 4;                   /* next pixel */
      iM >>=  4;
      iS -= 4;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the gray level */
      iQ = (mng_uint8)((iB & iM) >> iS);
      iQ = (mng_uint8)(iQ + (iQ << 4));/* expand to 8-bit by replication */

      *pRGBArow     = iQ;              /* put in intermediate row */
      *(pRGBArow+1) = iQ;
      *(pRGBArow+2) = iQ;
      *(pRGBArow+3) = 0xFF;

      pRGBArow += 4;                   /* next pixel */
      iM >>=  4;
      iS -= 4;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_process_g8 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G8, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iB = *pWorkrow;                  /* get next input-byte */

      if (iB == pBuf->iTRNSgray)       /* transparent ? */
      {
        *pRGBArow     = 0;             /* put in intermediate row */
        *(pRGBArow+1) = 0;
        *(pRGBArow+2) = 0;
        *(pRGBArow+3) = 0;
      }
      else
      {
        *pRGBArow     = iB;            /* put in intermediate row */
        *(pRGBArow+1) = iB;
        *(pRGBArow+2) = iB;
        *(pRGBArow+3) = 0xFF;
      }

      pRGBArow += 4;                   /* next pixel */
      pWorkrow++;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iB = *pWorkrow;                  /* get next input-byte */

      *pRGBArow     = iB;              /* put in intermediate row */
      *(pRGBArow+1) = iB;
      *(pRGBArow+2) = iB;
      *(pRGBArow+3) = 0xFF;

      pRGBArow += 4;                   /* next pixel */
      pWorkrow++;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_process_g16 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint16     iW;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G16, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iW = mng_get_uint16 (pWorkrow);  /* get input */

      if (iW == pBuf->iTRNSgray)       /* transparent ? */
      {                                /* put in intermediate row */
        mng_put_uint16 (pRGBArow,   0);
        mng_put_uint16 (pRGBArow+2, 0);
        mng_put_uint16 (pRGBArow+4, 0);
        mng_put_uint16 (pRGBArow+6, 0);
      }
      else
      {                                /* put in intermediate row */
        mng_put_uint16 (pRGBArow,   iW);
        mng_put_uint16 (pRGBArow+2, iW);
        mng_put_uint16 (pRGBArow+4, iW);
        mng_put_uint16 (pRGBArow+6, 0xFFFF);
      }

      pRGBArow += 8;                   /* next pixel */
      pWorkrow += 2;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iW = mng_get_uint16 (pWorkrow);  /* get input */

      mng_put_uint16 (pRGBArow,   iW); /* and put in intermediate row */
      mng_put_uint16 (pRGBArow+2, iW);
      mng_put_uint16 (pRGBArow+4, iW);
      mng_put_uint16 (pRGBArow+6, 0xFFFF);

      pRGBArow += 8;                   /* next pixel */
      pWorkrow += 2;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_G16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_process_rgb8 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iR, iG, iB;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGB8, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iR = *pWorkrow;                  /* get the RGB values */
      iG = *(pWorkrow+1);
      iB = *(pWorkrow+2);
                                       /* transparent ? */
      if ((iR == pBuf->iTRNSred) && (iG == pBuf->iTRNSgreen) &&
          (iB == pBuf->iTRNSblue))
      {
        *pRGBArow     = 0;             /* this pixel is transparent ! */
        *(pRGBArow+1) = 0;
        *(pRGBArow+2) = 0;
        *(pRGBArow+3) = 0;
      }
      else
      {
        *pRGBArow     = iR;            /* copy the RGB values */
        *(pRGBArow+1) = iG;
        *(pRGBArow+2) = iB;
        *(pRGBArow+3) = 0xFF;          /* this one isn't transparent */
      }

      pWorkrow += 3;                   /* next pixel */
      pRGBArow += 4;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      *pRGBArow     = *pWorkrow;       /* copy the RGB bytes */
      *(pRGBArow+1) = *(pWorkrow+1);
      *(pRGBArow+2) = *(pWorkrow+2);
      *(pRGBArow+3) = 0xFF;            /* no alpha; so always fully opaque */

      pWorkrow += 3;                   /* next pixel */
      pRGBArow += 4;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGB8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_process_rgb16 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint16     iR, iG, iB;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGB16, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iR = mng_get_uint16 (pWorkrow);  /* get the RGB values */
      iG = mng_get_uint16 (pWorkrow+2);
      iB = mng_get_uint16 (pWorkrow+4);
                                       /* transparent ? */
      if ((iR == pBuf->iTRNSred) && (iG == pBuf->iTRNSgreen) &&
          (iB == pBuf->iTRNSblue))
      {                                /* transparent then */
        mng_put_uint16 (pRGBArow,   0);
        mng_put_uint16 (pRGBArow+2, 0);
        mng_put_uint16 (pRGBArow+4, 0);
        mng_put_uint16 (pRGBArow+6, 0);
      }
      else
      {                                /* put in intermediate row */
        mng_put_uint16 (pRGBArow,   iR);
        mng_put_uint16 (pRGBArow+2, iG);
        mng_put_uint16 (pRGBArow+4, iB);
        mng_put_uint16 (pRGBArow+6, 0xFFFF);
      }

      pWorkrow += 6;                   /* next pixel */
      pRGBArow += 8;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {                                  /* copy the RGB values */
      mng_put_uint16 (pRGBArow,   mng_get_uint16 (pWorkrow  ));
      mng_put_uint16 (pRGBArow+2, mng_get_uint16 (pWorkrow+2));
      mng_put_uint16 (pRGBArow+4, mng_get_uint16 (pWorkrow+4));
      mng_put_uint16 (pRGBArow+6, 0xFFFF);

      pWorkrow += 6;                   /* next pixel */
      pRGBArow += 8;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGB16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_process_idx1 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX1, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
        iS = 7;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
                                       /* transparency for this index ? */
        if ((mng_uint32)iQ < pBuf->iTRNScount)
          *(pRGBArow+3) = pBuf->aTRNSentries [iQ];
        else
          *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  1;
      iS -= 1;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0x80;
        iS = 7;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
        *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  1;
      iS -= 1;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_process_idx2 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX2, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
                                       /* transparency for this index ? */
        if ((mng_uint32)iQ < pBuf->iTRNScount)
          *(pRGBArow+3) = pBuf->aTRNSentries [iQ];
        else
          *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  2;
      iS -= 2;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = *pWorkrow;                /* get next input-byte */
        pWorkrow++;
        iM = 0xC0;
        iS = 6;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        *pRGBArow     = pBuf->aPLTEentries [iQ].iRed;
        *(pRGBArow+1) = pBuf->aPLTEentries [iQ].iGreen;
        *(pRGBArow+2) = pBuf->aPLTEentries [iQ].iBlue;
        *(pRGBArow+3) = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  2;
      iS -= 2;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_process_idx4 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iB;
  mng_uint8      iM;
  mng_uint32     iS;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX4, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;
  iM       = 0;                        /* start at pixel 0 */
  iB       = 0;
  iS       = 0;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = pWorkrow [0];             /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        pRGBArow [0] = pBuf->aPLTEentries [iQ].iRed;
        pRGBArow [1] = pBuf->aPLTEentries [iQ].iGreen;
        pRGBArow [2] = pBuf->aPLTEentries [iQ].iBlue;
                                       /* transparency for this index ? */
        if ((mng_uint32)iQ < pBuf->iTRNScount)
          pRGBArow [3] = pBuf->aTRNSentries [iQ];
        else
          pRGBArow [3] = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  4;
      iS -= 4;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      if (!iM)                         /* mask underflow ? */
      {
        iB = pWorkrow [0];             /* get next input-byte */
        pWorkrow++;
        iM = 0xF0;
        iS = 4;
      }
                                       /* get the index */
      iQ = (mng_uint8)((iB & iM) >> iS);
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        pRGBArow [0] = pBuf->aPLTEentries [iQ].iRed;
        pRGBArow [1] = pBuf->aPLTEentries [iQ].iGreen;
        pRGBArow [2] = pBuf->aPLTEentries [iQ].iBlue;
        pRGBArow [3] = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      iM >>=  4;
      iS -= 4;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_process_idx8 (mng_datap pData)
{
  mng_uint8p     pWorkrow;
  mng_uint8p     pRGBArow;
  mng_int32      iX;
  mng_uint8      iQ;
  mng_imagedatap pBuf = (mng_imagedatap)pData->pStorebuf;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX8, MNG_LC_START);
#endif

  if (!pBuf)                           /* no object? then use obj 0 */
    pBuf = ((mng_imagep)pData->pObjzero)->pImgbuf;
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

  if (pBuf->bHasTRNS)                  /* tRNS encountered ? */
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iQ = *pWorkrow;                  /* get input byte */
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        pRGBArow [0] = pBuf->aPLTEentries [iQ].iRed;
        pRGBArow [1] = pBuf->aPLTEentries [iQ].iGreen;
        pRGBArow [2] = pBuf->aPLTEentries [iQ].iBlue;
                                       /* transparency for this index ? */
        if ((mng_uint32)iQ < pBuf->iTRNScount)
          pRGBArow [3] = pBuf->aTRNSentries [iQ];
        else
          pRGBArow [3] = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      pWorkrow++;
    }

    pData->bIsOpaque = MNG_FALSE;      /* it's not fully opaque */
  }
  else
  {
#ifdef MNG_DECREMENT_LOOPS
    for (iX = pData->iRowsamples; iX > 0; iX--)
#else
    for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
    {
      iQ = *pWorkrow;                  /* get input byte */
                                       /* index valid ? */
      if ((mng_uint32)iQ < pBuf->iPLTEcount)
      {                                /* put in intermediate row */
        pRGBArow [0] = pBuf->aPLTEentries [iQ].iRed;
        pRGBArow [1] = pBuf->aPLTEentries [iQ].iGreen;
        pRGBArow [2] = pBuf->aPLTEentries [iQ].iBlue;
        pRGBArow [3] = 0xFF;
      }
      else
        MNG_ERROR (pData, MNG_PLTEINDEXERROR);

      pRGBArow += 4;                   /* next pixel */
      pWorkrow++;
    }

    pData->bIsOpaque = MNG_TRUE;       /* it's fully opaque */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_IDX8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_process_ga8 (mng_datap pData)
{
  mng_uint8p pWorkrow;
  mng_uint8p pRGBArow;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_GA8, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    *pRGBArow     = *pWorkrow;         /* copy the gray value */
    *(pRGBArow+1) = *pWorkrow;
    *(pRGBArow+2) = *pWorkrow;
    *(pRGBArow+3) = *(pWorkrow+1);     /* copy the alpha value */

    pWorkrow += 2;                     /* next pixel */
    pRGBArow += 4;
  }

  pData->bIsOpaque = MNG_FALSE;        /* it's definitely not fully opaque */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_GA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_process_ga16 (mng_datap pData)
{
  mng_uint8p  pWorkrow;
  mng_uint8p  pRGBArow;
  mng_int32  iX;
  mng_uint16 iW;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_GA16, MNG_LC_START);
#endif
                                       /* temporary work pointers */
  pWorkrow = pData->pWorkrow + pData->iPixelofs;
  pRGBArow = pData->pRGBArow;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iW = mng_get_uint16 (pWorkrow);    /* copy the gray value */
    mng_put_uint16 (pRGBArow,   iW);
    mng_put_uint16 (pRGBArow+2, iW);
    mng_put_uint16 (pRGBArow+4, iW);
                                       /* copy the alpha value */
    mng_put_uint16 (pRGBArow+6, mng_get_uint16 (pWorkrow+2));

    pWorkrow += 4;                     /* next pixel */
    pRGBArow += 8;
  }

  pData->bIsOpaque = MNG_FALSE;        /* it's definitely not fully opaque */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_GA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_process_rgba8 (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGBA8, MNG_LC_START);
#endif
                                       /* this is the easiest transform */
  MNG_COPY (pData->pRGBArow, pData->pWorkrow + pData->iPixelofs, pData->iRowsize);

  pData->bIsOpaque = MNG_FALSE;        /* it's definitely not fully opaque */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_process_rgba16 (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGBA16, MNG_LC_START);
#endif
                                       /* this is the easiest transform */
  MNG_COPY (pData->pRGBArow, pData->pWorkrow + pData->iPixelofs, pData->iRowsize);

  pData->bIsOpaque = MNG_FALSE;        /* it's definitely not fully opaque */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_PROCESS_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Row processing initialization routines - set up the variables needed   * */
/* * to process uncompressed row-data                                       * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_OPTIMIZE_FOOTPRINT_INIT
#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_init_g1_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G1_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g1;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g1;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g1;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g1;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 7;
  pData->iSamplediv  = 3;
  pData->iRowsize    = (pData->iRowsamples + 7) >> 3;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G1_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g1_i      (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G1_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g1;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g1;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g1;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g1;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 7;
  pData->iSamplediv  = 3;
  pData->iRowsize    = ((pData->iRowsamples + 7) >> 3);
  pData->iRowmax     = ((pData->iDatawidth + 7) >> 3) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G1_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g2_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G2_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g2;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g2;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g2;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g2;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 3;
  pData->iSamplediv  = 2;
  pData->iRowsize    = (pData->iRowsamples + 3) >> 2;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G2_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g2_i      (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G2_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g2;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g2;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g2;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g2;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 3;
  pData->iSamplediv  = 2;
  pData->iRowsize    = ((pData->iRowsamples + 3) >> 2);
  pData->iRowmax     = ((pData->iDatawidth + 3) >> 2) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G2_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g4_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G4_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g4;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g4;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g4;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g4;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 1;
  pData->iSamplediv  = 1;
  pData->iRowsize    = (pData->iRowsamples + 1) >> 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G4_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g4_i      (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G4_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g4;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g4;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g4;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g4;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 1;
  pData->iSamplediv  = 1;
  pData->iRowsize    = ((pData->iRowsamples + 1) >> 1);
  pData->iRowmax     = ((pData->iDatawidth + 1) >> 1) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G4_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_init_g8_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G8_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_g8_i      (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G8_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g8;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples;
  pData->iRowmax     = pData->iDatawidth + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G8_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_g16_ni    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G16_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g16;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 2;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 2;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G16_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_g16_i     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G16_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_g16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_g16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_g16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g16;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 2;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 1;
  pData->iRowmax     = (pData->iDatawidth << 1) + pData->iPixelofs;
  pData->iFilterbpp  = 2;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_G16_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_init_rgb8_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB8_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgb8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgb8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgb8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgb8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 3;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples * 3;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 3;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_rgb8_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB8_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgb8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgb8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgb8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgb8;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 3;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples * 3;
  pData->iRowmax     = (pData->iDatawidth * 3) + pData->iPixelofs;
  pData->iFilterbpp  = 3;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB8_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_rgb16_ni  (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB16_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgb16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgb16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgb16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgb16;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 6;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples * 6;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 6;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB16_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_rgb16_i   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB16_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgb16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgb16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgb16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgb16;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 6;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples * 6;
  pData->iRowmax     = (pData->iDatawidth * 6) + pData->iPixelofs;
  pData->iFilterbpp  = 6;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGB16_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_init_idx1_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX1_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx1;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx1;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx1;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx1;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 7;
  pData->iSamplediv  = 3;
  pData->iRowsize    = (pData->iRowsamples + 7) >> 3;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX1_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx1_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX1_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx1;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx1;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx1;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx1;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 7;
  pData->iSamplediv  = 3;
  pData->iRowsize    = (pData->iRowsamples + 7) >> 3;
  pData->iRowmax     = ((pData->iDatawidth + 7) >> 3) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX1_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx2_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX2_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx2;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx2;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx2;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx2;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 3;
  pData->iSamplediv  = 2;
  pData->iRowsize    = (pData->iRowsamples + 3) >> 2;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX2_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx2_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX2_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx2;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx2;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx2;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx2;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 3;
  pData->iSamplediv  = 2;
  pData->iRowsize    = (pData->iRowsamples + 3) >> 2;
  pData->iRowmax     = ((pData->iDatawidth + 3) >> 2) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX2_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx4_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX4_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx4;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx4;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx4;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx4;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 1;
  pData->iSamplediv  = 1;
  pData->iRowsize    = (pData->iRowsamples + 1) >> 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX4_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx4_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX4_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx4;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx4;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx4;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx4;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 1;
  pData->iSamplediv  = 1;
  pData->iRowsize    = (pData->iRowsamples + 1) >> 1;
  pData->iRowmax     = ((pData->iDatawidth + 1) >> 1) + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX4_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_init_idx8_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX8_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_idx8_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX8_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_idx8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_idx8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_idx8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_idx8;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples;
  pData->iRowmax     = pData->iDatawidth + pData->iPixelofs;
  pData->iFilterbpp  = 1;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_IDX8_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_ga8_ni    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA8_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_ga8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_ga8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_ga8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_ga8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 2;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 2;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_ga8_i     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA8_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_ga8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_ga8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_ga8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_ga8;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 2;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 1;
  pData->iRowmax     = (pData->iDatawidth << 1) + pData->iPixelofs;
  pData->iFilterbpp  = 2;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA8_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_ga16_ni   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA16_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_ga16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_ga16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_ga16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_ga16;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 4;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 2;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 4;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA16_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_ga16_i    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA16_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_ga16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_ga16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_ga16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_ga16;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 4;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 2;
  pData->iRowmax     = (pData->iDatawidth << 2) + pData->iPixelofs;
  pData->iFilterbpp  = 4;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_GA16_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

mng_retcode mng_init_rgba8_ni  (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA8_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgba8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgba8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgba8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgba8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 4;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 2;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 4;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
/* ************************************************************************** */

mng_retcode mng_init_rgba8_i   (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA8_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgba8;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgba8;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgba8;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgba8;
#endif

  pData->iPass       = 0;              /* from 0..6; is 1..7 in specifications */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 4;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 2;
  pData->iRowmax     = (pData->iDatawidth << 2) + pData->iPixelofs;
  pData->iFilterbpp  = 4;
  pData->bIsRGBA16   = MNG_FALSE;      /* intermediate row is 8-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA8_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_rgba16_ni (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA16_NI, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgba16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgba16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgba16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgba16;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 8;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 3;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 8;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA16_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_rgba16_i  (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA16_I, MNG_LC_START);
#endif

  if (pData->fDisplayrow)
    pData->fProcessrow = (mng_fptr)mng_process_rgba16;

  if (pData->pStoreobj)                /* store in object too ? */
  {                                    /* immediate delta ? */
#ifndef MNG_NO_DELTA_PNG
    if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
      pData->fStorerow = (mng_fptr)mng_delta_rgba16;
    else
#endif
      pData->fStorerow = (mng_fptr)mng_store_rgba16;
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_rgba16;
#endif

  pData->iPass       = 0;              /* from 0..6; (1..7 in specification) */
  pData->iRow        = interlace_row     [0];
  pData->iRowinc     = interlace_rowskip [0];
  pData->iCol        = interlace_col     [0];
  pData->iColinc     = interlace_colskip [0];
  pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >> interlace_divider [0];
  pData->iSamplemul  = 8;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 3;
  pData->iRowmax     = (pData->iDatawidth << 3) + pData->iPixelofs;
  pData->iFilterbpp  = 8;
  pData->bIsRGBA16   = MNG_TRUE;       /* intermediate row is 16-bit deep */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_RGBA16_I, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * Row processing initialization routines (JPEG) - set up the variables   * */
/* * needed to process uncompressed row-data                                * */
/* *                                                                        * */
/* ************************************************************************** */

#ifdef MNG_INCLUDE_JNG

/* ************************************************************************** */

#ifndef MNG_NO_1_2_4BIT_SUPPORT
mng_retcode mng_init_jpeg_a1_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A1_NI, MNG_LC_START);
#endif

  if (pData->pStoreobj)                /* store in object too ? */
  {
    if (pData->iJHDRimgbitdepth == 8)
    {
      switch (pData->iJHDRcolortype)
      {
        case 12 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a1;   break; }
        case 14 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a1; break; }
      }
    }

    /* TODO: bitdepth 12 & 20 */

  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g1;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 7;
  pData->iSamplediv  = 3;
  pData->iRowsize    = (pData->iRowsamples + 7) >> 3;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A1_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_jpeg_a2_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A2_NI, MNG_LC_START);
#endif

  if (pData->pStoreobj)                /* store in object too ? */
  {
    if (pData->iJHDRimgbitdepth == 8)
    {
      switch (pData->iJHDRcolortype)
      {
        case 12 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a2;   break; }
        case 14 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a2; break; }
      }
    }

    /* TODO: bitdepth 12 & 20 */

  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g2;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 3;
  pData->iSamplediv  = 2;
  pData->iRowsize    = (pData->iRowsamples + 3) >> 2;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A2_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

mng_retcode mng_init_jpeg_a4_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A4_NI, MNG_LC_START);
#endif

  if (pData->pStoreobj)                /* store in object too ? */
  {
    if (pData->iJHDRimgbitdepth == 8)
    {
      switch (pData->iJHDRcolortype)
      {
        case 12 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a4;   break; }
        case 14 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a4; break; }
      }
    }

    /* TODO: bitdepth 12 & 20 */

  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g4;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 1;
  pData->iSamplediv  = 1;
  pData->iRowsize    = (pData->iRowsamples + 1) >> 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A4_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif /* MNG_NO_1_2_4BIT_SUPPORT */

/* ************************************************************************** */

mng_retcode mng_init_jpeg_a8_ni     (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A8_NI, MNG_LC_START);
#endif

  if (pData->pStoreobj)                /* store in object too ? */
  {
    if (pData->iJHDRimgbitdepth == 8)
    {
      switch (pData->iJHDRcolortype)
      {
        case 12 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a8;   break; }
        case 14 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a8; break; }
      }
    }

    /* TODO: bitdepth 12 & 20 */

  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g8;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 1;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 1;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A8_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_init_jpeg_a16_ni    (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A16_NI, MNG_LC_START);
#endif

  if (pData->pStoreobj)                /* store in object too ? */
  {
    if (pData->iJHDRimgbitdepth == 8)
    {
      switch (pData->iJHDRcolortype)
      {
        case 12 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a16;   break; }
        case 14 : { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a16; break; }
      }
    }

    /* TODO: bitdepth 12 & 20 */

  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
    pData->fDifferrow  = (mng_fptr)mng_differ_g16;
#endif

  pData->iPass       = -1;
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iDatawidth;
  pData->iSamplemul  = 2;
  pData->iSampleofs  = 0;
  pData->iSamplediv  = 0;
  pData->iRowsize    = pData->iRowsamples << 1;
  pData->iRowmax     = pData->iRowsize + pData->iPixelofs;
  pData->iFilterbpp  = 2;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_JPEG_A16_NI, MNG_LC_END);
#endif

  return mng_init_rowproc (pData);
}
#endif

/* ************************************************************************** */

#endif /* MNG_INCLUDE_JNG */
#endif /* MNG_OPTIMIZE_FOOTPRINT_INIT */


/* ************************************************************************** */
/* *                                                                        * */
/* * Generic row processing initialization & cleanup routines               * */
/* * - initialize the buffers used by the row processing routines           * */
/* * - cleanup the buffers used by the row processing routines              * */
/* *                                                                        * */
/* ************************************************************************** */

mng_retcode mng_init_rowproc (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_ROWPROC, MNG_LC_START);
#endif

#ifdef MNG_OPTIMIZE_FOOTPRINT_INIT
  if (pData->ePng_imgtype != png_none)
  {
  if (pData->fDisplayrow)
    switch (pData->ePng_imgtype)
    {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_g1:
      pData->fProcessrow = (mng_fptr)mng_process_g1;
      break;
    case png_g2:
      pData->fProcessrow = (mng_fptr)mng_process_g2;
      break;
    case png_g4:
      pData->fProcessrow = (mng_fptr)mng_process_g4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_g8:
      pData->fProcessrow = (mng_fptr)mng_process_g8;
      break;
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_idx1:
      pData->fProcessrow = (mng_fptr)mng_process_idx1;
      break;
    case png_idx2:
      pData->fProcessrow = (mng_fptr)mng_process_idx2;
      break;
    case png_idx4:
      pData->fProcessrow = (mng_fptr)mng_process_idx4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_idx8:
      pData->fProcessrow = (mng_fptr)mng_process_idx8;
      break;
    case png_ga8:
      pData->fProcessrow = (mng_fptr)mng_process_ga8;
      break;
    case png_rgb8:
      pData->fProcessrow = (mng_fptr)mng_process_rgb8;
      break;
    case png_rgba8:
      pData->fProcessrow = (mng_fptr)mng_process_rgba8;
      break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_g16:
      pData->fProcessrow = (mng_fptr)mng_process_g16;
      break;
    case png_ga16:
      pData->fProcessrow = (mng_fptr)mng_process_ga16;
      break;
    case png_rgb16:
      pData->fProcessrow = (mng_fptr)mng_process_rgb16;
      break;
    case png_rgba16:
      pData->fProcessrow = (mng_fptr)mng_process_rgba16;
      break;
#endif
    default:
      break;
    }

  if (pData->pStoreobj)                /* store in object too ? */
  {
#ifndef MNG_NO_DELTA_PNG
  if ((pData->bHasDHDR) && (pData->bDeltaimmediate))
    switch (pData->ePng_imgtype)
    {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_g1:
      pData->fStorerow = (mng_fptr)mng_delta_g1;
      break;
    case png_g2:
      pData->fStorerow = (mng_fptr)mng_delta_g2;
      break;
    case png_g4:
      pData->fStorerow = (mng_fptr)mng_delta_g4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_g8:
      pData->fStorerow = (mng_fptr)mng_delta_g8;
      break;
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_idx1:
      pData->fStorerow = (mng_fptr)mng_delta_idx1;
      break;
    case png_idx2:
      pData->fStorerow = (mng_fptr)mng_delta_idx2;
      break;
    case png_idx4:
      pData->fStorerow = (mng_fptr)mng_delta_idx4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_idx8:
      pData->fStorerow = (mng_fptr)mng_delta_idx8;
      break;
    case png_ga8:
      pData->fStorerow = (mng_fptr)mng_delta_ga8;
      break;
    case png_rgb8:
      pData->fStorerow = (mng_fptr)mng_delta_rgb8;
      break;
    case png_rgba8:
      pData->fStorerow = (mng_fptr)mng_delta_rgba8;
      break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_g16:
      pData->fStorerow = (mng_fptr)mng_delta_g16;
      break;
    case png_ga16:
      pData->fStorerow = (mng_fptr)mng_delta_ga16;
      break;
    case png_rgb16:
      pData->fStorerow = (mng_fptr)mng_delta_rgb16;
      break;
    case png_rgba16:
      pData->fStorerow = (mng_fptr)mng_delta_rgba16;
      break;
#endif
    default:
      break;
    }
  else
#endif  /* MNG_NO_DELTA_PNG */
    switch (pData->ePng_imgtype)
    {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_g1:
      pData->fStorerow = (mng_fptr)mng_store_g1;
      break;
    case png_g2:
      pData->fStorerow = (mng_fptr)mng_store_g2;
      break;
    case png_g4:
      pData->fStorerow = (mng_fptr)mng_store_g4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_g8:
      pData->fStorerow = (mng_fptr)mng_store_g8;
      break;
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_idx1:
      pData->fStorerow = (mng_fptr)mng_store_idx1;
      break;
    case png_idx2:
      pData->fStorerow = (mng_fptr)mng_store_idx2;
      break;
    case png_idx4:
      pData->fStorerow = (mng_fptr)mng_store_idx4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_idx8:
      pData->fStorerow = (mng_fptr)mng_store_idx8;
      break;
    case png_ga8:
      pData->fStorerow = (mng_fptr)mng_store_ga8;
      break;
    case png_rgb8:
      pData->fStorerow = (mng_fptr)mng_store_rgb8;
      break;
    case png_rgba8:
      pData->fStorerow = (mng_fptr)mng_store_rgba8;
      break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_g16:
      pData->fStorerow = (mng_fptr)mng_store_g16;
      break;
    case png_ga16:
      pData->fStorerow = (mng_fptr)mng_store_ga16;
      break;
    case png_rgb16:
      pData->fStorerow = (mng_fptr)mng_store_rgb16;
      break;
    case png_rgba16:
      pData->fStorerow = (mng_fptr)mng_store_rgba16;
      break;
#endif

#ifdef MNG_INCLUDE_JNG
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_jpeg_a1:
/*  if (pData->iJHDRimgbitdepth == 8) */
      {
        switch (pData->iJHDRcolortype)
        {
        case 12 :
          { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a1;   break; }
        case 14 :
          { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a1; break; }
        }
      }
      /* TODO: bitdepth 12 & 20 */
      break;
    case png_jpeg_a2:
/*  if (pData->iJHDRimgbitdepth == 8) */
      {
        switch (pData->iJHDRcolortype)
        {
          case 12 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a2;   break; }
          case 14 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a2; break; }
        }
      }
      break;
      /* TODO: bitdepth 12 & 20 */
    case png_jpeg_a4:
/*  if (pData->iJHDRimgbitdepth == 8) */
      {
        switch (pData->iJHDRcolortype)
        {
          case 12 :
           { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a4;   break; }
          case 14 :
           { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a4; break; }
        }
      }
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
      /* TODO: bitdepth 12 & 20 */
    case png_jpeg_a8:
/*  if (pData->iJHDRimgbitdepth == 8) */
      {
        switch (pData->iJHDRcolortype)
        {
          case 12 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a8;   break; }
          case 14 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a8; break; }
        }
      }
      break;
      /* TODO: bitdepth 12 & 20 */
#ifndef MNG_NO_16BIT_SUPPORT
    case png_jpeg_a16:
/*  if (pData->iJHDRimgbitdepth == 8) */
      {
        switch (pData->iJHDRcolortype)
        {
          case 12 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_g8_a16;   break; }
          case 14 :
            { pData->fStorerow = (mng_fptr)mng_store_jpeg_rgb8_a16; break; }
        }
      }
      break;
      /* TODO: bitdepth 12 & 20 */
#endif
#endif /* MNG_INCLUDE_JNG */
    default:
      break;
    }
  }

#ifdef FILTER192                       /* leveling & differing ? */
  if (pData->iFilter == MNG_FILTER_DIFFERING)
  switch (pData->ePng_imgtype)
  {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_g1:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a1:
#endif
      pData->fDifferrow  = (mng_fptr)mng_differ_g1;
      break;
    case png_g2:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a2:
#endif
      pData->fDifferrow  = (mng_fptr)mng_differ_g2;
      break;
    case png_g4:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a4:
#endif
      pData->fDifferrow  = (mng_fptr)mng_differ_g4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_g8:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a8:
#endif
      pData->fDifferrow  = (mng_fptr)mng_differ_g8;
      break;
    case png_rgb8:
      pData->fDifferrow  = (mng_fptr)mng_differ_rgb8;
      break;
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_idx1:
      pData->fDifferrow  = (mng_fptr)mng_differ_idx1;
      break;
    case png_idx2:
      pData->fDifferrow  = (mng_fptr)mng_differ_idx2;
      break;
    case png_idx4:
      pData->fDifferrow  = (mng_fptr)mng_differ_idx4;
      break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_idx8:
      pData->fDifferrow  = (mng_fptr)mng_differ_idx8;
      break;
    case png_ga8:
      pData->fDifferrow  = (mng_fptr)mng_differ_ga8;
      break;
    case png_rgb8:
      pData->fDifferrow  = (mng_fptr)mng_differ_rgb8;
      break;
    case png_rgba8:
      pData->fDifferrow  = (mng_fptr)mng_differ_rgba8;
      break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_g16:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a16:
#endif
      pData->fDifferrow  = (mng_fptr)mng_differ_g16;
      break;
    case png_ga16:
      pData->fDifferrow  = (mng_fptr)mng_differ_ga16;
      break;
    case png_rgb16:
      pData->fDifferrow  = (mng_fptr)mng_differ_rgb16;
      break;
    case png_rgba16:
      pData->fDifferrow  = (mng_fptr)mng_differ_rgba16;
      break;
#endif
    default:
      break;
  }
#endif

  switch (pData->ePng_imgtype)
  {
#ifndef MNG_NO_1_2_4BIT_SUPPORT
    case png_g1:
    case png_idx1:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a1:
#endif
        pData->iSamplemul  = 1;
        pData->iSampleofs  = 7;
        pData->iSamplediv  = 3;
        pData->iFilterbpp  = 1;
        break;
    case png_g2:
    case png_idx2:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a2:
#endif
        pData->iSamplemul  = 1;
        pData->iSampleofs  = 3;
        pData->iSamplediv  = 2;
        pData->iFilterbpp  = 1;
        break;
    case png_g4:
    case png_idx4:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a4:
#endif
        pData->iSamplemul  = 1;
        pData->iSampleofs  = 1;
        pData->iSamplediv  = 1;
        pData->iFilterbpp  = 1;
        break;
#endif /* MNG_NO_1_2_4BIT_SUPPORT */
    case png_g8:
    case png_idx8:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a8:
#endif
        pData->iSamplemul  = 1;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 1;
        break;
    case png_ga8:
#ifndef MNG_NO_16BIT_SUPPORT
    case png_g16:
#ifdef MNG_INCLUDE_JNG
    case png_jpeg_a16:
#endif
#endif
        pData->iSamplemul  = 2;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 2;
        break;
    case png_rgb8:
        pData->iSamplemul  = 3;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 3;
        break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_ga16:
#endif
    case png_rgba8:
        pData->iSamplemul  = 4;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 4;
        break;
#ifndef MNG_NO_16BIT_SUPPORT
    case png_rgb16:
        pData->iSamplemul  = 6;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 6;
        break;
    case png_rgba16:
        pData->iSamplemul  = 8;
        pData->iSampleofs  = 0;
        pData->iSamplediv  = 0;
        pData->iFilterbpp  = 8;
        break;
#endif
    default:
        break;
  }

  if (pData->iInterlace)               /* noninterlaced */
  {
    pData->iPass       = 0;      /* from 0..6; (1..7 in specification) */
    pData->iRow        = interlace_row     [0];
    pData->iRowinc     = interlace_rowskip [0];
    pData->iCol        = interlace_col     [0];
    pData->iColinc     = interlace_colskip [0];
    pData->iRowsamples = (pData->iDatawidth + interlace_roundoff [0]) >>
       interlace_divider [0];
    pData->iRowmax     = ((pData->iDatawidth * pData->iSamplemul +
       pData->iSampleofs) >> pData->iSamplediv) + pData->iPixelofs;
  }
  else                                 /* interlaced */
  {
    pData->iPass       = -1;
    pData->iRow        = 0;
    pData->iRowinc     = 1;
    pData->iCol        = 0;
    pData->iColinc     = 1;
    pData->iRowsamples = pData->iDatawidth;
  }
  if (pData->iSamplediv > 0)
     pData->iRowsize    = (pData->iRowsamples + pData->iSampleofs) >>
         pData->iSamplediv;
  else
     pData->iRowsize    = (pData->iRowsamples * pData->iSamplemul);

  if (!pData->iInterlace)               /* noninterlaced */
     pData->iRowmax     = pData->iRowsize + pData->iPixelofs;

#ifdef MNG_NO_16BIT_SUPPORT
  pData->bIsRGBA16 = MNG_FALSE;
#else
  switch (pData->ePng_imgtype)
  {
    case png_g16:
    case png_ga16:
    case png_rgb16:
    case png_rgba16:
       pData->bIsRGBA16 = MNG_TRUE;
       break;
    default:
       pData->bIsRGBA16 = MNG_FALSE;
       break;
  }
#endif

  }
#endif /* MNG_OPTIMIZE_FOOTPRINT_INIT */

  if (pData->pStoreobj)                /* storage object selected ? */
  {
    pData->pStorebuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
                                       /* and so it becomes viewable ! */
    ((mng_imagep)pData->pStoreobj)->bViewable     = MNG_TRUE;
    ((mng_imagedatap)pData->pStorebuf)->bViewable = MNG_TRUE;
  }

  /* allocate the buffers; the individual init routines have already
     calculated the required maximum size; except in the case of a JNG
     without alpha!!! */
  if (pData->iRowmax)
  {
#ifdef MNG_NO_16BIT_SUPPORT
      MNG_ALLOC (pData, pData->pWorkrow, pData->iPNGmult*pData->iRowmax);
      MNG_ALLOC (pData, pData->pPrevrow, pData->iPNGmult*pData->iRowmax);
#else
      MNG_ALLOC (pData, pData->pWorkrow, pData->iRowmax);
      MNG_ALLOC (pData, pData->pPrevrow, pData->iRowmax);
#endif
  }

  /* allocate an RGBA16 row for intermediate processing */
  MNG_ALLOC (pData, pData->pRGBArow, (pData->iDatawidth << 3));

#ifndef MNG_NO_CMS
  if (pData->fDisplayrow)              /* display "on-the-fly" ? */
  {
#if defined(MNG_FULL_CMS)              /* determine color-management initialization */
    mng_retcode iRetcode = mng_init_full_cms   (pData, MNG_TRUE, MNG_TRUE, MNG_FALSE);
#elif defined(MNG_GAMMA_ONLY)
    mng_retcode iRetcode = mng_init_gamma_only (pData, MNG_TRUE, MNG_TRUE, MNG_FALSE);
#elif defined(MNG_APP_CMS)
    mng_retcode iRetcode = mng_init_app_cms    (pData, MNG_TRUE, MNG_TRUE, MNG_FALSE);
#endif
    if (iRetcode)                      /* on error bail out */
      return iRetcode;
  }
#endif /* !MNG_NO_CMS */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_INIT_ROWPROC, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_next_row (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_ROW, MNG_LC_START);
#endif

  pData->iRow += pData->iRowinc;       /* increase the row counter */

  if (pData->iPass >= 0)               /* interlaced ? */
  {
    while ((pData->iPass < 7) &&       /* went 'outside' the image ? */
           ((pData->iRow >= (mng_int32)pData->iDataheight) ||
            (pData->iCol >= (mng_int32)pData->iDatawidth )    ))
    {
      pData->iPass++;                  /* next pass ! */

      if (pData->iPass < 7)            /* there's only 7 passes ! */
      {
        pData->iRow        = interlace_row     [pData->iPass];
        pData->iRowinc     = interlace_rowskip [pData->iPass];
        pData->iCol        = interlace_col     [pData->iPass];
        pData->iColinc     = interlace_colskip [pData->iPass];
        pData->iRowsamples = (pData->iDatawidth - pData->iCol + interlace_roundoff [pData->iPass])
                                 >> interlace_divider [pData->iPass];

        if (pData->iSamplemul > 1)     /* recalculate row dimension */
          pData->iRowsize  = pData->iRowsamples * pData->iSamplemul;
        else
        if (pData->iSamplediv > 0)
          pData->iRowsize  = (pData->iRowsamples + pData->iSampleofs) >> pData->iSamplediv;
        else
          pData->iRowsize  = pData->iRowsamples;

      }

      if ((pData->iPass < 7) &&        /* reset previous row to zeroes ? */
          (pData->iRow  < (mng_int32)pData->iDataheight) &&
          (pData->iCol  < (mng_int32)pData->iDatawidth )    )
      {                                /* making sure the filters will work properly! */
        mng_int32  iX;
        mng_uint8p pTemp = pData->pPrevrow;

#ifdef MNG_NO_16BIT_SUPPORT
#ifdef MNG_DECREMENT_LOOPS
        for (iX = pData->iPNGmult*pData->iRowsize; iX > 0; iX--)
#else
        for (iX = 0; iX < pData->iPNGmult*pData->iRowsize; iX++)
#endif
#else
#ifdef MNG_DECREMENT_LOOPS
        for (iX = pData->iRowsize; iX > 0; iX--)
#else
        for (iX = 0; iX < pData->iRowsize; iX++)
#endif
#endif
        {
          *pTemp = 0;
          pTemp++;
        }
      }
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_ROW, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_cleanup_rowproc (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_CLEANUP_ROWPROC, MNG_LC_START);
#endif

#ifdef MNG_INCLUDE_LCMS                /* cleanup cms profile/transform */
  {
    mng_retcode iRetcode = mng_clear_cms (pData);

    if (iRetcode)                      /* on error bail out */
      return iRetcode;
  }
#endif /* MNG_INCLUDE_LCMS */

  if (pData->pWorkrow)                 /* cleanup buffer for working row */
    MNG_FREE (pData, pData->pWorkrow, pData->iRowmax);

  if (pData->pPrevrow)                 /* cleanup buffer for previous row */
    MNG_FREE (pData, pData->pPrevrow, pData->iRowmax);

  if (pData->pRGBArow)                 /* cleanup buffer for intermediate row */
    MNG_FREE (pData, pData->pRGBArow, (pData->iDatawidth << 3));

  pData->pWorkrow = 0;                 /* propogate uninitialized buffers */
  pData->pPrevrow = 0;
  pData->pRGBArow = 0;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_CLEANUP_ROWPROC, MNG_LC_END);
#endif

  return MNG_NOERROR;                  /* woohiii */
}

/* ************************************************************************** */
/* *                                                                        * */
/* * Generic row processing routines for JNG                                * */
/* *                                                                        * */
/* ************************************************************************** */

#ifdef MNG_INCLUDE_JNG

/* ************************************************************************** */

mng_retcode mng_display_jpeg_rows (mng_datap pData)
{
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_JPEG_ROWS, MNG_LC_START);
#endif
                                       /* any completed rows ? */
  if ((pData->iJPEGrow      > pData->iJPEGdisprow) &&
      (pData->iJPEGalpharow > pData->iJPEGdisprow)    )
  {
    mng_uint32 iX, iMax;
    mng_uint32 iSaverow = pData->iRow; /* save alpha decompression row-count */
                                       /* determine the highest complete(!) row */
    if (pData->iJPEGrow > pData->iJPEGalpharow)
      iMax = pData->iJPEGalpharow;
    else
      iMax = pData->iJPEGrow;
                                       /* display the rows */
    for (iX = pData->iJPEGdisprow; iX < iMax; iX++)
    {
      pData->iRow = iX;                /* make sure we all know which row to handle */
                                       /* makeup an intermediate row from the buffer */
      iRetcode = ((mng_retrieverow)pData->fRetrieverow) (pData);
                                       /* color-correct it if necessary */
      if ((!iRetcode) && (pData->fCorrectrow))
        iRetcode = ((mng_correctrow)pData->fCorrectrow) (pData);

      if (!iRetcode)                   /* and display it */
      {
        iRetcode = ((mng_displayrow)pData->fDisplayrow) (pData);

        if (!iRetcode)                 /* check progressive display refresh */
          iRetcode = mng_display_progressive_check (pData);
      }

      if (iRetcode)                    /* on error bail out */
        return iRetcode;
    }

    pData->iJPEGdisprow = iMax;        /* keep track of the last displayed row */
    pData->iRow         = iSaverow;    /* restore alpha decompression row-count */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_JPEG_ROWS, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_next_jpeg_alpharow (mng_datap pData)
{
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_JPEG_ALPHAROW, MNG_LC_START);
#endif

  pData->iJPEGalpharow++;              /* count the row */

  if (pData->fDisplayrow)              /* display "on-the-fly" ? */
  {                                    /* try to display what you can */
    iRetcode = mng_display_jpeg_rows (pData);

    if (iRetcode)                      /* on error bail out */
      return iRetcode;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_JPEG_ALPHAROW, MNG_LC_END);
#endif

  return MNG_NOERROR; 
}

/* ************************************************************************** */

mng_retcode mng_next_jpeg_row (mng_datap pData)
{
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_JPEG_ROW, MNG_LC_START);
#endif

  pData->iJPEGrow++;                   /* increase the row-counter */
  
  if (pData->fDisplayrow)              /* display "on-the-fly" ? */
  {                                    /* has alpha channel ? */
    if ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA ) ||
        (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA)    )
    {                                  /* try to display what you can */
      iRetcode = mng_display_jpeg_rows (pData);
    }
    else
    {                                  /* make sure we all know which row to handle */
      pData->iRow = pData->iJPEGrow - 1;
                                       /* makeup an intermediate row from the buffer */
      iRetcode = ((mng_retrieverow)pData->fRetrieverow) (pData);
                                       /* color-correct it if necessary */
      if ((!iRetcode) && (pData->fCorrectrow))
        iRetcode = ((mng_correctrow)pData->fCorrectrow) (pData);

      if (!iRetcode)                   /* and display it */
      {
        iRetcode = ((mng_displayrow)pData->fDisplayrow) (pData);

        if (!iRetcode)                 /* check progressive display refresh */
          iRetcode = mng_display_progressive_check (pData);
      }
    }

    if (iRetcode)                      /* on error bail out */
      return iRetcode;
  }

                                       /* surpassed last filled row ? */
  if (pData->iJPEGrow > pData->iJPEGrgbrow)
    pData->iJPEGrgbrow = pData->iJPEGrow;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_JPEG_ROW, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#endif /* MNG_INCLUDE_JNG */

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_MAGN
#ifndef MNG_OPTIMIZE_FOOTPRINT_MAGN
mng_retcode mng_magnify_g8_x1 (mng_datap  pData,
                               mng_uint16 iMX,
                               mng_uint16 iML,
                               mng_uint16 iMR,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline,
                               mng_uint8p pDstline)
{
  mng_uint32 iX, iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X1, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g8_x2 (mng_datap  pData,
                               mng_uint16 iMX,
                               mng_uint16 iML,
                               mng_uint16 iMR,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline,
                               mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 1;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {                                /* is it same as first ? */
        if (*pTempsrc1 == *pTempsrc2)
        {
          for (iS = 1; iS < iM; iS++)  /* then just repeat the first */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }
        }
        else
        {
          for (iS = 1; iS < iM; iS++)  /* calculate the distances */
          {
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );
            pTempdst++;
          }
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
        }
      }
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g8_x3 (mng_datap  pData,
                               mng_uint16 iMX,
                               mng_uint16 iML,
                               mng_uint16 iMR,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline,
                               mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X3, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 1;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {                                /* is it same as first ? */
        if (*pTempsrc1 == *pTempsrc2)
        {
          for (iS = 1; iS < iM; iS++)  /* then just repeat the first */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }
        }
        else
        {
          iH = (iM+1) / 2;             /* calculate halfway point */

          for (iS = 1; iS < iH; iS++)  /* replicate first half */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }

          for (iS = iH; iS < iM; iS++) /* replicate second half */
          {
            *pTempdst = *pTempsrc2;
            pTempdst++;
          }
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
        }
      }
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_x1 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32 iX, iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X1, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
      *pTempdst = *(pTempsrc1+2);
      pTempdst++;
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_x2 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 3;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1)) -
                                                 (mng_int32)(*(pTempsrc1+1)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))         );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+2)) -
                                                 (mng_int32)(*(pTempsrc1+2)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+2))         );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_x3 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X3, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 3;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */ 

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);

          pTempdst += 3;
        }

        for (iS = iH; iS < iM; iS++)    /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);

          pTempdst += 3;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_x1 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32 iX, iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X1, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_x2 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1)) -
                                                 (mng_int32)(*(pTempsrc1+1)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))         );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_x3 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X3, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);

          pTempdst += 2;
        }

        for (iS = iH; iS < iM; iS++)   /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);

          pTempdst += 2;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_x4 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X4, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          *pTempdst = *(pTempsrc1+1);  /* replicate alpha from left */

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          *pTempdst = *(pTempsrc2+1);  /* replicate alpha from right */

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_x5 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X5, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          *pTempdst = *pTempsrc1;      /* replicate gray from left */

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);/* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1))     -
                                                 (mng_int32)(*(pTempsrc1+1))     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))             );

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          *pTempdst = *pTempsrc2;      /* replicate gray from right */

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);/* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1))     -
                                                 (mng_int32)(*(pTempsrc1+1))     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))             );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_X5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_OPTIMIZE_FOOTPRINT_MAGN */

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_x1 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX, iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X1, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
      *pTempdst = *(pTempsrc1+2);
      pTempdst++;
      *pTempdst = *(pTempsrc1+3);
      pTempdst++;
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_x2 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1)) -
                                                 (mng_int32)(*(pTempsrc1+1)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))         );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+2)) -
                                                 (mng_int32)(*(pTempsrc1+2)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+2))         );

          pTempdst++;

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *pTempdst = *(pTempsrc1+3);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+3)) -
                                                 (mng_int32)(*(pTempsrc1+3)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+3))         );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_x3 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X3, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);
          *(pTempdst+3) = *(pTempsrc1+3);

          pTempdst += 4;
        }

        for (iS = iH; iS < iM; iS++)   /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);
          *(pTempdst+3) = *(pTempsrc2+3);

          pTempdst += 4;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_x4 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X4, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1)) -
                                                 (mng_int32)(*(pTempsrc1+1)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))         );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+2)) -
                                                 (mng_int32)(*(pTempsrc1+2)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+2))         );

          pTempdst++;
                                       /* replicate alpha from left */
          *pTempdst     = *(pTempsrc1+3);

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*pTempsrc2)     -
                                                 (mng_int32)(*pTempsrc1)     ) + iM) /
                                     (iM * 2)) + (mng_int32)(*pTempsrc1)             );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+1)) -
                                                 (mng_int32)(*(pTempsrc1+1)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+1))         );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            *pTempdst = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+2)) -
                                                 (mng_int32)(*(pTempsrc1+2)) ) + iM) /
                                     (iM * 2)) + (mng_int32)(*(pTempsrc1+2))         );

          pTempdst++;
                                       /* replicate alpha from right */
          *pTempdst     = *(pTempsrc2+3);

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_x5 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_int32  iS, iM, iH;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X5, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline;                /* initialize pixel-loop */
  pTempdst  = pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          *pTempdst     = *pTempsrc1;  /* replicate color from left */
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *(pTempdst+3) = *(pTempsrc1+3);
          else
            *(pTempdst+3) = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+3)) -
                                                   (mng_int32)(*(pTempsrc1+3)) ) + iM) /
                                       (iM * 2)) + (mng_int32)(*(pTempsrc1+3))         );

          pTempdst += 4;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          *pTempdst     = *pTempsrc2;  /* replicate color from right */
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *(pTempdst+3) = *(pTempsrc1+3);
          else
            *(pTempdst+3) = (mng_uint8)(((2 * iS * ( (mng_int32)(*(pTempsrc2+3)) -
                                                   (mng_int32)(*(pTempsrc1+3)) ) + iM) /
                                       (iM * 2)) + (mng_int32)(*(pTempsrc1+3))         );

          pTempdst += 4;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_OPTIMIZE_FOOTPRINT_MAGN
mng_retcode mng_magnify_g8_y1 (mng_datap  pData,
                               mng_int32  iS,
                               mng_int32  iM,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline1,
                               mng_uint8p pSrcline2,
                               mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, iWidth);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */
mng_retcode mng_magnify_g8_y2 (mng_datap  pData,
                               mng_int32  iS,
                               mng_int32  iM,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline1,
                               mng_uint8p pSrcline2,
                               mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g8_y3 (mng_datap  pData,
                               mng_int32  iS,
                               mng_int32  iM,
                               mng_uint32 iWidth,
                               mng_uint8p pSrcline1,
                               mng_uint8p pSrcline2,
                               mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, iWidth)
    else
      MNG_COPY (pDstline, pSrcline2, iWidth);
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, iWidth);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G8_Y3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_y1 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, iWidth * 3);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_y2 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth * 3);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb8_y3 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, iWidth * 3)
    else
      MNG_COPY (pDstline, pSrcline2, iWidth * 3);
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, iWidth * 3);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB8_Y3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_y1 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, iWidth << 1);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_y2 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 1);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_y3 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, iWidth << 1)
    else
      MNG_COPY (pDstline, pSrcline2, iWidth << 1);
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, iWidth << 1);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_y4 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y4, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2 += 2;

        *pTempdst++ = *pTempsrc1++;    /* replicate alpha from top */
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1 += 2;
        pTempsrc2++;

        *pTempdst++ = *pTempsrc2++;    /* replicate alpha from bottom */
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 1);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga8_y5 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y5, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst = *pTempsrc1;        /* replicate gray from top */

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst = *pTempsrc2;        /* replicate gray from bottom */

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 1);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA8_Y5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_OPTIMIZE_FOOTPRINT_MAGN */

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_y1 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, iWidth << 2);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_y2 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y2, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                               (mng_int32)(*pTempsrc1) ) + iM) /
                                   (iM * 2) ) + (mng_int32)(*pTempsrc1) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_y3 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, iWidth << 2)
    else
      MNG_COPY (pDstline, pSrcline2, iWidth << 2);
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, iWidth << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_y4 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y4, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2 += 2;

        *pTempdst++ = *pTempsrc1++;    /* replicate alpha from top */
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1 += 2;
        pTempsrc2++;

        *pTempdst++ = *pTempsrc2++;    /* replicate alpha from bottom */
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba8_y5 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
  mng_uint32 iX;
  mng_uint8p pTempsrc1;
  mng_uint8p pTempsrc2;
  mng_uint8p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y5, MNG_LC_START);
#endif

  pTempsrc1 = pSrcline1;               /* initialize pixel-loop */
  pTempsrc2 = pSrcline2;
  pTempdst  = pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst++ = *pTempsrc1++;    /* replicate color from top */
        *pTempdst++ = *pTempsrc1++;
        *pTempdst++ = *pTempsrc1++;

        pTempsrc2 += 3;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst++ = *pTempsrc2++;    /* replicate color from bottom */
        *pTempdst++ = *pTempsrc2++;
        *pTempdst++ = *pTempsrc2++;

        pTempsrc1 += 3;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          *pTempdst = (mng_uint8)( ( (2 * iS * ( (mng_int32)(*pTempsrc2) -
                                                 (mng_int32)(*pTempsrc1) ) + iM) /
                                     (iM * 2) ) + (mng_int32)(*pTempsrc1) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth << 2);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA8_Y5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_OPTIMIZE_FOOTPRINT_MAGN
#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_magnify_g16_x1 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32  iX, iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X1, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g16_x2 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 1;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {                                /* is it same as first ? */
        if (*pTempsrc1 == *pTempsrc2)
        {
          for (iS = 1; iS < iM; iS++)  /* then just repeat the first */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }
        }
        else
        {
          for (iS = 1; iS < iM; iS++)  /* calculate the distances */
          {
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2))   -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))          ));
            pTempdst++;
          }
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
        }
      }
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g16_x3 (mng_datap  pData,
                                mng_uint16 iMX,
                                mng_uint16 iML,
                                mng_uint16 iMR,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline,
                                mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X3, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 1;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {                                /* is it same as first ? */
        if (*pTempsrc1 == *pTempsrc2)
        {
          for (iS = 1; iS < iM; iS++)  /* then just repeat the first */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }
        }
        else
        {
          iH = (iM+1) / 2;             /* calculate halfway point */

          for (iS = 1; iS < iH; iS++)  /* replicate first half */
          {
            *pTempdst = *pTempsrc1;
            pTempdst++;
          }

          for (iS = iH; iS < iM; iS++) /* replicate second half */
          {
            *pTempdst = *pTempsrc2;
            pTempdst++;
          }
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
        }
      }
    }

    pTempsrc1++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_x1 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32  iX, iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X1, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
      *pTempdst = *(pTempsrc1+2);
      pTempdst++;
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_x2 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 3;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+2))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2)))         ) );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_x3 (mng_datap  pData,
                                  mng_uint16 iMX,
                                  mng_uint16 iML,
                                  mng_uint16 iMR,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline,
                                  mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X3, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 3;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */ 

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);

          pTempdst += 3;
        }

        for (iS = iH; iS < iM; iS++)    /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);

          pTempdst += 3;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_x1 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX, iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X1, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p) pSrcline;  /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_x2 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_x3 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X3, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);

          pTempdst += 2;
        }

        for (iS = iH; iS < iM; iS++)   /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);

          pTempdst += 2;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_x4 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X4, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          *pTempdst = *(pTempsrc1+1);  /* replicate alpha from left */

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          *pTempdst = *(pTempsrc2+1);  /* replicate alpha from right */

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_x5 (mng_datap  pData,
                                 mng_uint16 iMX,
                                 mng_uint16 iML,
                                 mng_uint16 iMR,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X5, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 2;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          *pTempdst = *pTempsrc1;      /* replicate gray from left */

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);/* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          *pTempdst = *pTempsrc2;      /* replicate gray from right */

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);/* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_X5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_x1 (mng_datap  pData,
                                   mng_uint16 iMX,
                                   mng_uint16 iML,
                                   mng_uint16 iMR,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX, iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X1, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
      iM = iML;
    else
    if (iX == (iWidth - 1))            /* last interval ? */
      iM = iMR;
    else
      iM = iMX;

    for (iS = 1; iS < iM; iS++)        /* fill interval */
    {
      *pTempdst = *pTempsrc1;          /* copy original source pixel */
      pTempdst++;
      *pTempdst = *(pTempsrc1+1);
      pTempdst++;
      *pTempdst = *(pTempsrc1+2);
      pTempdst++;
      *pTempdst = *(pTempsrc1+3);
      pTempdst++;
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_x2 (mng_datap  pData,
                                   mng_uint16 iMX,
                                   mng_uint16 iML,
                                   mng_uint16 iMR,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        for (iS = 1; iS < iM; iS++)
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+2))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2)))         ) );

          pTempdst++;

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *pTempdst = *(pTempsrc1+3);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+3))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3)))         ) );

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_x3 (mng_datap  pData,
                                   mng_uint16 iMX,
                                   mng_uint16 iML,
                                   mng_uint16 iMR,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X3, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* replicate first half */
        {
          *pTempdst     = *pTempsrc1;
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);
          *(pTempdst+3) = *(pTempsrc1+3);

          pTempdst += 4;
        }

        for (iS = iH; iS < iM; iS++)   /* replicate second half */
        {
          *pTempdst     = *pTempsrc2;
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);
          *(pTempdst+3) = *(pTempsrc2+3);

          pTempdst += 4;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_x4 (mng_datap  pData,
                                   mng_uint16 iMX,
                                   mng_uint16 iML,
                                   mng_uint16 iMR,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X4, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+2))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2)))         ) );

          pTempdst++;
                                       /* replicate alpha from left */
          *pTempdst     = *(pTempsrc1+3);

          pTempdst++;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          if (*pTempsrc1 == *pTempsrc2)
            *pTempdst = *pTempsrc1;    /* just repeat the first */
          else                         /* calculate the distance */
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

          pTempdst++;

          if (*(pTempsrc1+1) == *(pTempsrc2+1))
            *pTempdst = *(pTempsrc1+1);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+1))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+1)))         ) );

          pTempdst++;

          if (*(pTempsrc1+2) == *(pTempsrc2+2))
            *pTempdst = *(pTempsrc1+2);
          else
            mng_put_uint16 ((mng_uint8p)pTempdst,
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+2))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+2)))         ) );

          pTempdst++;
                                       /* replicate alpha from right */
          *pTempdst     = *(pTempsrc2+3);

          pTempdst++;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_x5 (mng_datap  pData,
                                   mng_uint16 iMX,
                                   mng_uint16 iML,
                                   mng_uint16 iMR,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_int32   iS, iM, iH;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X5, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline;   /* initialize pixel-loop */
  pTempdst  = (mng_uint16p)pDstline;

  for (iX = 0; iX < iWidth; iX++)
  {
    pTempsrc2 = pTempsrc1 + 4;

    *pTempdst = *pTempsrc1;            /* copy original source pixel */
    pTempdst++;
    *pTempdst = *(pTempsrc1+1);
    pTempdst++;
    *pTempdst = *(pTempsrc1+2);
    pTempdst++;
    *pTempdst = *(pTempsrc1+3);
    pTempdst++;

    if (iX == 0)                       /* first interval ? */
    {
      if (iWidth == 1)                 /* single pixel ? */
        pTempsrc2 = MNG_NULL;

      iM = (mng_int32)iML;
    }
    else
    if (iX == (iWidth - 2))            /* last interval ? */
      iM = (mng_int32)iMR;
    else
      iM = (mng_int32)iMX;
                                       /* fill interval ? */
    if ((iX < iWidth - 1) || (iWidth == 1))
    {
      if (pTempsrc2)                   /* do we have the second pixel ? */
      {
        iH = (iM+1) / 2;               /* calculate halfway point */

        for (iS = 1; iS < iH; iS++)    /* first half */
        {
          *pTempdst     = *pTempsrc1;  /* replicate color from left */
          *(pTempdst+1) = *(pTempsrc1+1);
          *(pTempdst+2) = *(pTempsrc1+2);

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *(pTempdst+3) = *(pTempsrc1+3);
          else
            mng_put_uint16 ((mng_uint8p)(pTempdst+3),
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+3))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3)))         ) );

          pTempdst += 4;
        }

        for (iS = iH; iS < iM; iS++)   /* second half */
        {
          *pTempdst     = *pTempsrc2;  /* replicate color from right */
          *(pTempdst+1) = *(pTempsrc2+1);
          *(pTempdst+2) = *(pTempsrc2+2);

          if (*(pTempsrc1+3) == *(pTempsrc2+3))
            *(pTempdst+3) = *(pTempsrc1+3);
          else
            mng_put_uint16 ((mng_uint8p)(pTempdst+3),
                            (mng_uint16)(((2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc2+3))) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3))) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)(pTempsrc1+3)))         ) );

          pTempdst += 4;
        }
      }
      else
      {
        for (iS = 1; iS < iM; iS++)
        {
          *pTempdst = *pTempsrc1;      /* repeat first source pixel */
          pTempdst++;
          *pTempdst = *(pTempsrc1+1);
          pTempdst++;
          *pTempdst = *(pTempsrc1+2);
          pTempdst++;
          *pTempdst = *(pTempsrc1+3);
          pTempdst++;
        }
      }
    }

    pTempsrc1 += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_X4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g16_y1 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, (iWidth << 1));

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g16_y2 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 1));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_g16_y3 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, (iWidth << 1))
    else
      MNG_COPY (pDstline, pSrcline2, (iWidth << 1));
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, (iWidth << 1));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_G16_Y3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_y1 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, iWidth * 6);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_y2 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, iWidth * 6);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgb16_y3 (mng_datap  pData,
                                  mng_int32  iS,
                                  mng_int32  iM,
                                  mng_uint32 iWidth,
                                  mng_uint8p pSrcline1,
                                  mng_uint8p pSrcline2,
                                  mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, iWidth * 6)
    else
      MNG_COPY (pDstline, pSrcline2, iWidth * 6);
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, iWidth * 6);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGB16_Y3, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_y1 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, (iWidth << 2));

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_y2 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 2));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_y3 (mng_datap  pData,
                                mng_int32  iS,
                                mng_int32  iM,
                                mng_uint32 iWidth,
                                mng_uint8p pSrcline1,
                                mng_uint8p pSrcline2,
                                mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, (iWidth << 2))
    else
      MNG_COPY (pDstline, pSrcline2, (iWidth << 2));
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, (iWidth << 2));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_y4 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y4, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2 += 2;

        *pTempdst++ = *pTempsrc1++;    /* replicate alpha from top */
      }
    }
    else
    {
       for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1 += 2;
        pTempsrc2++;

        *pTempdst++ = *pTempsrc2++;    /* replicate alpha from bottom */
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 2));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_ga16_y5 (mng_datap  pData,
                                 mng_int32  iS,
                                 mng_int32  iM,
                                 mng_uint32 iWidth,
                                 mng_uint8p pSrcline1,
                                 mng_uint8p pSrcline2,
                                 mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y5, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst = *pTempsrc1;        /* replicate gray from top */

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst = *pTempsrc2;        /* replicate gray from bottom */

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 2));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_GA16_Y5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_y1 (mng_datap  pData,
                                   mng_int32  iS,
                                   mng_int32  iM,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline1,
                                   mng_uint8p pSrcline2,
                                   mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y1, MNG_LC_START);
#endif

  MNG_COPY (pDstline, pSrcline1, (iWidth << 3));

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y1, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_y2 (mng_datap  pData,
                                   mng_int32  iS,
                                   mng_int32  iM,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline1,
                                   mng_uint8p pSrcline2,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y2, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    for (iX = 0; iX < iWidth; iX++)
    {                                  /* calculate the distances */
      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;

      if (*pTempsrc1 == *pTempsrc2)
        *pTempdst = *pTempsrc1;
      else
        mng_put_uint16 ((mng_uint8p)pTempdst,
                        (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                    (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                        (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

      pTempdst++;
      pTempsrc1++;
      pTempsrc2++;
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 3));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_y3 (mng_datap  pData,
                                   mng_int32  iS,
                                   mng_int32  iM,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline1,
                                   mng_uint8p pSrcline2,
                                   mng_uint8p pDstline)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y3, MNG_LC_START);
#endif

  if (pSrcline2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
      MNG_COPY (pDstline, pSrcline1, (iWidth << 3))
    else
      MNG_COPY (pDstline, pSrcline2, (iWidth << 3));
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pDstline, pSrcline1, (iWidth << 3));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y2, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_y4 (mng_datap  pData,
                                   mng_int32  iS,
                                   mng_int32  iM,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline1,
                                   mng_uint8p pSrcline2,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y4, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2 += 2;

        *pTempdst++ = *pTempsrc1++;    /* replicate alpha from top */
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {                                /* calculate the distances */
        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;

        if (*pTempsrc1 == *pTempsrc2)
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1 += 2;
        pTempsrc2++;

        *pTempdst++ = *pTempsrc2++;    /* replicate alpha from bottom */
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 3));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y4, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mng_magnify_rgba16_y5 (mng_datap  pData,
                                   mng_int32  iS,
                                   mng_int32  iM,
                                   mng_uint32 iWidth,
                                   mng_uint8p pSrcline1,
                                   mng_uint8p pSrcline2,
                                   mng_uint8p pDstline)
{
  mng_uint32  iX;
  mng_uint16p pTempsrc1;
  mng_uint16p pTempsrc2;
  mng_uint16p pTempdst;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y5, MNG_LC_START);
#endif

  pTempsrc1 = (mng_uint16p)pSrcline1;  /* initialize pixel-loop */
  pTempsrc2 = (mng_uint16p)pSrcline2;
  pTempdst  = (mng_uint16p)pDstline;

  if (pTempsrc2)                       /* do we have a second line ? */
  {
    if (iS < (iM+1) / 2)               /* top half ? */
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst++ = *pTempsrc1++;    /* replicate color from top */
        *pTempdst++ = *pTempsrc1++;
        *pTempdst++ = *pTempsrc1++;

        pTempsrc2 += 3;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
    else
    {
      for (iX = 0; iX < iWidth; iX++)
      {
        *pTempdst++ = *pTempsrc2++;    /* replicate color from bottom */
        *pTempdst++ = *pTempsrc2++;
        *pTempdst++ = *pTempsrc2++;

        pTempsrc1 += 3;

        if (*pTempsrc1 == *pTempsrc2)  /* calculate the distances */
          *pTempdst = *pTempsrc1;
        else
          mng_put_uint16 ((mng_uint8p)pTempdst,
                          (mng_uint16)( ( (2 * iS * ( (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc2)) -
                                                      (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1)) ) + iM) /
                                          (iM * 2)) + (mng_int32)(mng_get_uint16 ((mng_uint8p)pTempsrc1))         ) );

        pTempdst++;
        pTempsrc1++;
        pTempsrc2++;
      }
    }
  }
  else
  {                                    /* just repeat the entire line */
    MNG_COPY (pTempdst, pTempsrc1, (iWidth << 3));
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_MAGNIFY_RGBA16_Y5, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_NO_16BIT_SUPPORT */
#endif /* MNG_OPTIMIZE_FOOTPRINT_MAGN */
#endif /* MNG_SKIPCHUNK_MAGN */

/* ************************************************************************** */
/* *                                                                        * */
/* * PAST composition routines - compose over/under with a target object    * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_PAST
mng_retcode mng_composeover_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iFGa8, iBGa8;
  mng_uint8      iCr8, iCg8, iCb8, iCa8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEOVER_RGBA8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iFGa8 = *(pWorkrow+3);       /* get alpha values */
    iBGa8 = *(pOutrow+3);

    if (iFGa8)                   /* any opacity at all ? */
    {                            /* fully opaque or background fully transparent ? */
      if ((iFGa8 == 0xFF) || (iBGa8 == 0))
      {                          /* then simply copy the values */
        *pOutrow     = *pWorkrow;
        *(pOutrow+1) = *(pWorkrow+1);
        *(pOutrow+2) = *(pWorkrow+2);
        *(pOutrow+3) = iFGa8;
      }
      else
      {
        if (iBGa8 == 0xFF)       /* background fully opaque ? */
        {                        /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
          int i;
          for (i=2; i >= 0; i--)
          {
          MNG_COMPOSE8 (*(pOutrow+i), *(pWorkrow+i), iFGa8, *(pOutrow+i));
          }
#else
          MNG_COMPOSE8 (*pOutrow,     *pWorkrow,     iFGa8, *pOutrow    );
          MNG_COMPOSE8 (*(pOutrow+1), *(pWorkrow+1), iFGa8, *(pOutrow+1));
          MNG_COMPOSE8 (*(pOutrow+2), *(pWorkrow+2), iFGa8, *(pOutrow+2));
#endif
                                 /* alpha remains fully opaque !!! */
        }
        else
        {                        /* here we'll have to blend */
          MNG_BLEND8 (*pWorkrow, *(pWorkrow+1), *(pWorkrow+2), iFGa8,
                      *pOutrow, *(pOutrow+1), *(pOutrow+2), iBGa8,
                      iCr8, iCg8, iCb8, iCa8);
                                 /* and return the composed values */
          *pOutrow     = iCr8;
          *(pOutrow+1) = iCg8;
          *(pOutrow+2) = iCb8;
          *(pOutrow+3) = iCa8;
        }
      }
    }

    pOutrow  += 4;
    pWorkrow += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEOVER_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_composeover_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint16p    pWorkrow;
  mng_uint16p    pOutrow;
  mng_int32      iX;
  mng_uint16     iFGa16, iFGr16, iFGg16, iFGb16;
  mng_uint16     iBGa16, iBGr16, iBGg16, iBGb16;
  mng_uint16     iCr16, iCg16, iCb16, iCa16;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEOVER_RGBA16, MNG_LC_START);
#endif

  pWorkrow = (mng_uint16p)pData->pRGBArow;
  pOutrow  = (mng_uint16p)(pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                                            (pData->iCol * pBuf->iSamplesize));

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                              /* get alpha values */
    iFGa16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+3));
    iBGa16 = mng_get_uint16 ((mng_uint8p)(pOutrow+3));

    if (iFGa16)                  /* any opacity at all ? */
    {                            /* fully opaque or background fully transparent ? */
      if ((iFGa16 == 0xFFFF) || (iBGa16 == 0))
      {                          /* then simply copy the values */
        *pOutrow     = *pWorkrow;
        *(pOutrow+1) = *(pWorkrow+1);
        *(pOutrow+2) = *(pWorkrow+2);
        *(pOutrow+3) = *(pWorkrow+3);
      }
      else
      {                          /* get color values */
        iFGr16 = mng_get_uint16 ((mng_uint8p)pWorkrow);
        iFGg16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+1));
        iFGb16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+2));
        iBGr16 = mng_get_uint16 ((mng_uint8p)pOutrow);
        iBGg16 = mng_get_uint16 ((mng_uint8p)(pOutrow+1));
        iBGb16 = mng_get_uint16 ((mng_uint8p)(pOutrow+2));

        if (iBGa16 == 0xFFFF)    /* background fully opaque ? */
        {                        /* do alpha composing */
          MNG_COMPOSE16 (iFGr16, iFGr16, iFGa16, iBGr16);
          MNG_COMPOSE16 (iFGg16, iFGg16, iFGa16, iBGg16);
          MNG_COMPOSE16 (iFGb16, iFGb16, iFGa16, iBGb16);

          mng_put_uint16 ((mng_uint8p)pOutrow,     iFGr16);
          mng_put_uint16 ((mng_uint8p)(pOutrow+1), iFGg16);
          mng_put_uint16 ((mng_uint8p)(pOutrow+2), iFGb16);
                                 /* alpha remains fully opaque !!! */
        }
        else
        {                        /* here we'll have to blend */
          MNG_BLEND16 (iFGr16, iFGg16, iFGb16, iFGa16,
                       iBGr16, iBGg16, iBGb16, iBGa16,
                       iCr16,  iCg16,  iCb16,  iCa16);
                                 /* and return the composed values */
          mng_put_uint16 ((mng_uint8p)pOutrow,     iCr16);
          mng_put_uint16 ((mng_uint8p)(pOutrow+1), iCg16);
          mng_put_uint16 ((mng_uint8p)(pOutrow+2), iCb16);
          mng_put_uint16 ((mng_uint8p)(pOutrow+3), iCa16);
        }
      }
    }

    pOutrow  += 4;
    pWorkrow += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEOVER_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_composeunder_rgba8 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint8p     pWorkrow;
  mng_uint8p     pOutrow;
  mng_int32      iX;
  mng_uint8      iFGa8, iBGa8;
  mng_uint8      iCr8, iCg8, iCb8, iCa8;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEUNDER_RGBA8, MNG_LC_START);
#endif

  pWorkrow = pData->pRGBArow;
  pOutrow  = pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                              (pData->iCol * pBuf->iSamplesize);

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {
    iFGa8 = *(pOutrow+3);        /* get alpha values */
    iBGa8 = *(pWorkrow+3);
                                 /* anything to do at all ? */
    if ((iBGa8) && (iFGa8 != 0xFF))
    {
      if (iBGa8 == 0xFF)         /* background fully opaque ? */
      {                          /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
        int i;
        for (i=2; i >= 0; i--)
        {
        MNG_COMPOSE8 (*(pOutrow+i), *(pOutrow+i), iFGa8, *(pWorkrow+i));
        }
#else
        MNG_COMPOSE8 (*pOutrow,     *pOutrow,     iFGa8, *pWorkrow    );
        MNG_COMPOSE8 (*(pOutrow+1), *(pOutrow+1), iFGa8, *(pWorkrow+1));
        MNG_COMPOSE8 (*(pOutrow+2), *(pOutrow+2), iFGa8, *(pWorkrow+2));
#endif
        *(pOutrow+3) = 0xFF;     /* alpha becomes fully opaque !!! */
      }
      else
      {                          /* here we'll have to blend */
        MNG_BLEND8 (*pOutrow, *(pOutrow+1), *(pOutrow+2), iFGa8,
                    *pWorkrow, *(pWorkrow+1), *(pWorkrow+2), iBGa8,
                    iCr8, iCg8, iCb8, iCa8);
                                 /* and return the composed values */
        *pOutrow     = iCr8;
        *(pOutrow+1) = iCg8;
        *(pOutrow+2) = iCb8;
        *(pOutrow+3) = iCa8;
      }
    }

    pOutrow  += 4;
    pWorkrow += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEUNDER_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_composeunder_rgba16 (mng_datap pData)
{
  mng_imagedatap pBuf = ((mng_imagep)pData->pStoreobj)->pImgbuf;
  mng_uint16p    pWorkrow;
  mng_uint16p    pOutrow;
  mng_int32      iX;
  mng_uint16     iFGa16, iFGr16, iFGg16, iFGb16;
  mng_uint16     iBGa16, iBGr16, iBGg16, iBGb16;
  mng_uint16     iCr16, iCg16, iCb16, iCa16;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEUNDER_RGBA16, MNG_LC_START);
#endif

  pWorkrow = (mng_uint16p)pData->pRGBArow;
  pOutrow  = (mng_uint16p)(pBuf->pImgdata + (pData->iRow * pBuf->iRowsize   ) +
                                            (pData->iCol * pBuf->iSamplesize));

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                              /* get alpha values */
    iFGa16 = mng_get_uint16 ((mng_uint8p)(pOutrow+3));
    iBGa16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+3));
                                 /* anything to do at all ? */
    if ((iBGa16) && (iFGa16 != 0xFFFF))
    {
      iFGr16 = mng_get_uint16 ((mng_uint8p)pOutrow);
      iFGg16 = mng_get_uint16 ((mng_uint8p)(pOutrow+1));
      iFGb16 = mng_get_uint16 ((mng_uint8p)(pOutrow+2));
      iBGr16 = mng_get_uint16 ((mng_uint8p)pWorkrow);
      iBGg16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+1));
      iBGb16 = mng_get_uint16 ((mng_uint8p)(pWorkrow+2));

      if (iBGa16 == 0xFFFF)      /* background fully opaque ? */
      {                          /* do alpha composing */
        MNG_COMPOSE16 (iFGr16, iFGr16, iFGa16, iBGr16);
        MNG_COMPOSE16 (iFGg16, iFGg16, iFGa16, iBGg16);
        MNG_COMPOSE16 (iFGb16, iFGb16, iFGa16, iBGb16);

        mng_put_uint16 ((mng_uint8p)pOutrow,     iFGr16);
        mng_put_uint16 ((mng_uint8p)(pOutrow+1), iFGg16);
        mng_put_uint16 ((mng_uint8p)(pOutrow+2), iFGb16);
        *(pOutrow+3) = 0xFFFF;   /* alpha becomes fully opaque !!! */
      }
      else
      {                          /* here we'll have to blend */
        MNG_BLEND16 (iFGr16, iFGg16, iFGb16, iFGa16,
                     iBGr16, iBGg16, iBGb16, iBGa16,
                     iCr16,  iCg16,  iCb16,  iCa16);
                                 /* and return the composed values */
        mng_put_uint16 ((mng_uint8p)pOutrow,     iCr16);
        mng_put_uint16 ((mng_uint8p)(pOutrow+1), iCg16);
        mng_put_uint16 ((mng_uint8p)(pOutrow+2), iCb16);
        mng_put_uint16 ((mng_uint8p)(pOutrow+3), iCa16);
      }
    }

    pOutrow  += 4;
    pWorkrow += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_COMPOSEUNDER_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif

/* ************************************************************************** */
/* *                                                                        * */
/* * PAST flip & tile routines - flip or tile a row of pixels               * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_PAST
mng_retcode mng_flip_rgba8 (mng_datap pData)
{
  mng_uint32p pWorkrow;
  mng_uint32p pOutrow;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_FLIP_RGBA8, MNG_LC_START);
#endif
                                       /* setup temp pointers */
  pWorkrow        = (mng_uint32p)pData->pRGBArow + pData->iRowsamples - 1;
  pOutrow         = (mng_uint32p)pData->pWorkrow;
                                       /* swap original buffers */
  pData->pWorkrow = pData->pRGBArow;
  pData->pRGBArow = (mng_uint8p)pOutrow;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                                    /* let's flip */
    *pOutrow = *pWorkrow;
    pOutrow++;
    pWorkrow--;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_FLIP_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_flip_rgba16 (mng_datap pData)
{
  mng_uint32p pWorkrow;
  mng_uint32p pOutrow;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_FLIP_RGBA16, MNG_LC_START);
#endif
                                       /* setup temp pointers */
  pWorkrow        = (mng_uint32p)pData->pRGBArow + ((pData->iRowsamples - 1) << 1);
  pOutrow         = (mng_uint32p)pData->pWorkrow;
                                       /* swap original buffers */
  pData->pWorkrow = pData->pRGBArow;
  pData->pRGBArow = (mng_uint8p)pOutrow;

#ifdef MNG_DECREMENT_LOOPS
  for (iX = pData->iRowsamples; iX > 0; iX--)
#else
  for (iX = 0; iX < pData->iRowsamples; iX++)
#endif
  {                                    /* let's flip */
    *pOutrow       = *pWorkrow;
    *(pOutrow + 1) = *(pWorkrow + 1);

    pOutrow  += 2;
    pWorkrow -= 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_FLIP_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif

/* ************************************************************************** */

mng_retcode mng_tile_rgba8 (mng_datap pData)
{
  mng_uint32p pWorkrow;
  mng_uint32p pOutrow;
  mng_int32   iX;
  mng_uint32  iZ, iMax;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_TILE_RGBA8, MNG_LC_START);
#endif

  iZ              = pData->iSourcel;   /* indent ? */
                                       /* what's our source-length */
  iMax            = ((mng_imagep)pData->pRetrieveobj)->pImgbuf->iWidth;
                                       /* setup temp pointers */
  pWorkrow        = (mng_uint32p)pData->pRGBArow + iZ;
  pOutrow         = (mng_uint32p)pData->pWorkrow;
                                       /* swap original buffers */
  pData->pWorkrow = pData->pRGBArow;
  pData->pRGBArow = (mng_uint8p)pOutrow;

  for (iX = pData->iDestl; iX < pData->iDestr; iX++)
  {                                    /* tiiiile */
    *pOutrow = *pWorkrow;

    pWorkrow++;
    pOutrow++;
    iZ++;

    if (iZ >= iMax)                    /* end of source ? */
    {
      iZ       = 0;
      pWorkrow = (mng_uint32p)pData->pWorkrow;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_TILE_RGBA8, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#ifndef MNG_NO_16BIT_SUPPORT
mng_retcode mng_tile_rgba16 (mng_datap pData)
{
  mng_uint32p pWorkrow;
  mng_uint32p pOutrow;
  mng_int32   iX;
  mng_uint32  iZ, iMax;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_TILE_RGBA16, MNG_LC_START);
#endif

  iZ              = pData->iSourcel;   /* indent ? */
                                       /* what's our source-length */
  iMax            = ((mng_imagep)pData->pRetrieveobj)->pImgbuf->iWidth;
                                       /* setup temp pointers */
  pWorkrow        = (mng_uint32p)pData->pRGBArow + (iZ << 1);
  pOutrow         = (mng_uint32p)pData->pWorkrow;
                                       /* swap original buffers */
  pData->pWorkrow = pData->pRGBArow;
  pData->pRGBArow = (mng_uint8p)pOutrow;

  for (iX = pData->iDestl; iX < pData->iDestr; iX++)
  {                                    /* tiiiile */
    *pOutrow       = *pWorkrow;
    *(pOutrow + 1) = *(pWorkrow + 1);

    pWorkrow += 2;
    pOutrow  += 2;
    iZ++;

    if (iZ >= iMax)                    /* end of source ? */
    {
      iZ       = 0;
      pWorkrow = (mng_uint32p)pData->pWorkrow;
    }
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_TILE_RGBA16, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif
#endif /* MNG_SKIPCHUNK_PAST */

/* ************************************************************************** */

#endif /* MNG_INCLUDE_DISPLAY_PROCS */

/* ************************************************************************** */
/* * end of file                                                            * */
/* ************************************************************************** */


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