Logo Search packages:      
Sourcecode: qt4-x11 version File versions  Download package

tif_aux.c

/* $Id: tif_aux.c,v 1.19 2006/02/07 10:41:30 dron Exp $ */

/*
 * Copyright (c) 1991-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 *
 * Auxiliary Support Routines.
 */
#include "tiffiop.h"
#include "tif_predict.h"
#include <math.h>

tdata_t
_TIFFCheckMalloc(TIFF* tif, size_t nmemb, size_t elem_size, const char* what)
{
      tdata_t cp = NULL;
      tsize_t     bytes = nmemb * elem_size;

      /*
       * XXX: Check for integer overflow.
       */
      if (nmemb && elem_size && bytes / elem_size == nmemb)
            cp = _TIFFmalloc(bytes);

      if (cp == NULL)
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space %s", what);

      return (cp);
}

static int
TIFFDefaultTransferFunction(TIFFDirectory* td)
{
      uint16 **tf = td->td_transferfunction;
      tsize_t i, n, nbytes;

      tf[0] = tf[1] = tf[2] = 0;
      if (td->td_bitspersample >= sizeof(tsize_t) * 8 - 2)
            return 0;

      n = 1<<td->td_bitspersample;
      nbytes = n * sizeof (uint16);
      if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
            return 0;
      tf[0][0] = 0;
      for (i = 1; i < n; i++) {
            double t = (double)i/((double) n-1.);
            tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
      }

      if (td->td_samplesperpixel - td->td_extrasamples > 1) {
            if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
                  goto bad;
            _TIFFmemcpy(tf[1], tf[0], nbytes);
            if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
                  goto bad;
            _TIFFmemcpy(tf[2], tf[0], nbytes);
      }
      return 1;

bad:
      if (tf[0])
            _TIFFfree(tf[0]);
      if (tf[1])
            _TIFFfree(tf[1]);
      if (tf[2])
            _TIFFfree(tf[2]);
      tf[0] = tf[1] = tf[2] = 0;
      return 0;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 *
 * NB:      We use the value in the directory, rather than
 *    explcit values so that defaults exist only one
 *    place in the library -- in TIFFDefaultDirectory.
 */
int
TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list ap)
{
      TIFFDirectory *td = &tif->tif_dir;

      if (TIFFVGetField(tif, tag, ap))
            return (1);
      switch (tag) {
      case TIFFTAG_SUBFILETYPE:
            *va_arg(ap, uint32 *) = td->td_subfiletype;
            return (1);
      case TIFFTAG_BITSPERSAMPLE:
            *va_arg(ap, uint16 *) = td->td_bitspersample;
            return (1);
      case TIFFTAG_THRESHHOLDING:
            *va_arg(ap, uint16 *) = td->td_threshholding;
            return (1);
      case TIFFTAG_FILLORDER:
            *va_arg(ap, uint16 *) = td->td_fillorder;
            return (1);
      case TIFFTAG_ORIENTATION:
            *va_arg(ap, uint16 *) = td->td_orientation;
            return (1);
      case TIFFTAG_SAMPLESPERPIXEL:
            *va_arg(ap, uint16 *) = td->td_samplesperpixel;
            return (1);
      case TIFFTAG_ROWSPERSTRIP:
            *va_arg(ap, uint32 *) = td->td_rowsperstrip;
            return (1);
      case TIFFTAG_MINSAMPLEVALUE:
            *va_arg(ap, uint16 *) = td->td_minsamplevalue;
            return (1);
      case TIFFTAG_MAXSAMPLEVALUE:
            *va_arg(ap, uint16 *) = td->td_maxsamplevalue;
            return (1);
      case TIFFTAG_PLANARCONFIG:
            *va_arg(ap, uint16 *) = td->td_planarconfig;
            return (1);
      case TIFFTAG_RESOLUTIONUNIT:
            *va_arg(ap, uint16 *) = td->td_resolutionunit;
            return (1);
      case TIFFTAG_PREDICTOR:
                {
                  TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
                  *va_arg(ap, uint16*) = (uint16) sp->predictor;
                  return 1;
                }
      case TIFFTAG_DOTRANGE:
            *va_arg(ap, uint16 *) = 0;
            *va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
            return (1);
      case TIFFTAG_INKSET:
            *va_arg(ap, uint16 *) = INKSET_CMYK;
            return 1;
      case TIFFTAG_NUMBEROFINKS:
            *va_arg(ap, uint16 *) = 4;
            return (1);
      case TIFFTAG_EXTRASAMPLES:
            *va_arg(ap, uint16 *) = td->td_extrasamples;
            *va_arg(ap, uint16 **) = td->td_sampleinfo;
            return (1);
      case TIFFTAG_MATTEING:
            *va_arg(ap, uint16 *) =
                (td->td_extrasamples == 1 &&
                 td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
            return (1);
      case TIFFTAG_TILEDEPTH:
            *va_arg(ap, uint32 *) = td->td_tiledepth;
            return (1);
      case TIFFTAG_DATATYPE:
            *va_arg(ap, uint16 *) = td->td_sampleformat-1;
            return (1);
      case TIFFTAG_SAMPLEFORMAT:
            *va_arg(ap, uint16 *) = td->td_sampleformat;
                return(1);
      case TIFFTAG_IMAGEDEPTH:
            *va_arg(ap, uint32 *) = td->td_imagedepth;
            return (1);
      case TIFFTAG_YCBCRCOEFFICIENTS:
            {
                  /* defaults are from CCIR Recommendation 601-1 */
                  static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
                  *va_arg(ap, float **) = ycbcrcoeffs;
                  return 1;
            }
      case TIFFTAG_YCBCRSUBSAMPLING:
            *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
            *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
            return (1);
      case TIFFTAG_YCBCRPOSITIONING:
            *va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
            return (1);
      case TIFFTAG_WHITEPOINT:
            {
                  static float whitepoint[2];

                  /* TIFF 6.0 specification tells that it is no default
                     value for the WhitePoint, but AdobePhotoshop TIFF
                     Technical Note tells that it should be CIE D50. */
                  whitepoint[0] =   D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
                  whitepoint[1] =   D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
                  *va_arg(ap, float **) = whitepoint;
                  return 1;
            }
      case TIFFTAG_TRANSFERFUNCTION:
            if (!td->td_transferfunction[0] &&
                !TIFFDefaultTransferFunction(td)) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
                  return (0);
            }
            *va_arg(ap, uint16 **) = td->td_transferfunction[0];
            if (td->td_samplesperpixel - td->td_extrasamples > 1) {
                  *va_arg(ap, uint16 **) = td->td_transferfunction[1];
                  *va_arg(ap, uint16 **) = td->td_transferfunction[2];
            }
            return (1);
      case TIFFTAG_REFERENCEBLACKWHITE:
            {
                  int i;
                  static float ycbcr_refblackwhite[] = 
                  { 0.0F, 255.0F, 128.0F, 255.0F, 128.0F, 255.0F };
                  static float rgb_refblackwhite[6];

                  for (i = 0; i < 3; i++) {
                        rgb_refblackwhite[2 * i + 0] = 0.0F;
                        rgb_refblackwhite[2 * i + 1] =
                              (float)((1L<<td->td_bitspersample)-1L);
                  }
                  
                  if (td->td_photometric == PHOTOMETRIC_YCBCR) {
                        /*
                         * YCbCr (Class Y) images must have the
                         * ReferenceBlackWhite tag set. Fix the
                         * broken images, which lacks that tag.
                         */
                        *va_arg(ap, float **) = ycbcr_refblackwhite;
                  } else {
                        /*
                         * Assume RGB (Class R)
                         */
                        *va_arg(ap, float **) = rgb_refblackwhite;
                  }
                  return 1;
            }
      }
      return 0;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 */
int
TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
{
      int ok;
      va_list ap;

      va_start(ap, tag);
      ok =  TIFFVGetFieldDefaulted(tif, tag, ap);
      va_end(ap);
      return (ok);
}

/* vim: set ts=8 sts=8 sw=8 noet: */

Generated by  Doxygen 1.6.0   Back to index