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ftincrem.h

/***************************************************************************/
/*                                                                         */
/*  ftincrem.h                                                             */
/*                                                                         */
/*    FreeType incremental loading (specification).                        */
/*                                                                         */
/*  Copyright 2002, 2003, 2006, 2007 by                                    */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __FTINCREM_H__
#define __FTINCREM_H__

#include <ft2build.h>
#include FT_FREETYPE_H

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif


FT_BEGIN_HEADER

 /***************************************************************************
  *
  * @section:
  *    incremental
  *
  * @title:
  *    Incremental Loading
  *
  * @abstract:
  *    Custom Glyph Loading.
  *
  * @description:
  *   This section contains various functions used to perform so-called
  *   `incremental' glyph loading.  This is a mode where all glyphs loaded
  *   from a given @FT_Face are provided by the client application,
  *
  *   Apart from that, all other tables are loaded normally from the font
  *   file.  This mode is useful when FreeType is used within another
  *   engine, e.g., a Postscript Imaging Processor.
  *
  *   To enable this mode, you must use @FT_Open_Face, passing an
  *   @FT_Parameter with the @FT_PARAM_TAG_INCREMENTAL tag and an
  *   @FT_Incremental_Interface value.  See the comments for
  *   @FT_Incremental_InterfaceRec for an example.
  *
  */


 /***************************************************************************
  *
  * @type:
  *   FT_Incremental
  *
  * @description:
  *   An opaque type describing a user-provided object used to implement
  *   `incremental' glyph loading within FreeType.  This is used to support
  *   embedded fonts in certain environments (e.g., Postscript interpreters),
  *   where the glyph data isn't in the font file, or must be overridden by
  *   different values.
  *
  * @note:
  *   It is up to client applications to create and implement @FT_Incremental
  *   objects, as long as they provide implementations for the methods
  *   @FT_Incremental_GetGlyphDataFunc, @FT_Incremental_FreeGlyphDataFunc
  *   and @FT_Incremental_GetGlyphMetricsFunc.
  *
  *   See the description of @FT_Incremental_InterfaceRec to understand how
  *   to use incremental objects with FreeType.
  */
  typedef struct FT_IncrementalRec_*  FT_Incremental;


 /***************************************************************************
  *
  * @struct:
  *   FT_Incremental_Metrics
  *
  * @description:
  *   A small structure used to contain the basic glyph metrics returned
  *   by the @FT_Incremental_GetGlyphMetricsFunc method.
  *
  * @fields:
  *   bearing_x ::
  *     Left bearing, in font units.
  *
  *   bearing_y ::
  *     Top bearing, in font units.
  *
  *   advance ::
  *     Glyph advance, in font units.
  *
  * @note:
  *   These correspond to horizontal or vertical metrics depending on the
  *   value of the `vertical' argument to the function
  *   @FT_Incremental_GetGlyphMetricsFunc.
  */
  typedef struct  FT_Incremental_MetricsRec_
  {
    FT_Long  bearing_x;
    FT_Long  bearing_y;
    FT_Long  advance;

  } FT_Incremental_MetricsRec, *FT_Incremental_Metrics;


 /***************************************************************************
  *
  * @type:
  *   FT_Incremental_GetGlyphDataFunc
  *
  * @description:
  *   A function called by FreeType to access a given glyph's data bytes
  *   during @FT_Load_Glyph or @FT_Load_Char if incremental loading is
  *   enabled.
  *
  *   Note that the format of the glyph's data bytes depends on the font
  *   file format.  For TrueType, it must correspond to the raw bytes within
  *   the `glyf' table.  For Postscript formats, it must correspond to the
  *   *unencrypted* charstring bytes, without any `lenIV' header.  It is
  *   undefined for any other format.
  *
  * @input:
  *   incremental ::
  *     Handle to an opaque @FT_Incremental handle provided by the client
  *     application.
  *
  *   glyph_index ::
  *     Index of relevant glyph.
  *
  * @output:
  *   adata ::
  *     A structure describing the returned glyph data bytes (which will be
  *     accessed as a read-only byte block).
  *
  * @return:
  *   FreeType error code.  0 means success.
  *
  * @note:
  *   If this function returns successfully the method
  *   @FT_Incremental_FreeGlyphDataFunc will be called later to release
  *   the data bytes.
  *
  *   Nested calls to @FT_Incremental_GetGlyphDataFunc can happen for
  *   compound glyphs.
  */
  typedef FT_Error
  (*FT_Incremental_GetGlyphDataFunc)( FT_Incremental  incremental,
                                      FT_UInt         glyph_index,
                                      FT_Data*        adata );


 /***************************************************************************
  *
  * @type:
  *   FT_Incremental_FreeGlyphDataFunc
  *
  * @description:
  *   A function used to release the glyph data bytes returned by a
  *   successful call to @FT_Incremental_GetGlyphDataFunc.
  *
  * @input:
  *   incremental ::
  *     A handle to an opaque @FT_Incremental handle provided by the client
  *     application.
  *
  *   data ::
  *     A structure describing the glyph data bytes (which will be accessed
  *     as a read-only byte block).
  */
  typedef void
  (*FT_Incremental_FreeGlyphDataFunc)( FT_Incremental  incremental,
                                       FT_Data*        data );


 /***************************************************************************
  *
  * @type:
  *   FT_Incremental_GetGlyphMetricsFunc
  *
  * @description:
  *   A function used to retrieve the basic metrics of a given glyph index
  *   before accessing its data.  This is necessary because, in certain
  *   formats like TrueType, the metrics are stored in a different place from
  *   the glyph images proper.
  *
  * @input:
  *   incremental ::
  *     A handle to an opaque @FT_Incremental handle provided by the client
  *     application.
  *
  *   glyph_index ::
  *     Index of relevant glyph.
  *
  *   vertical ::
  *     If true, return vertical metrics.
  *
  *   ametrics ::
  *     This parameter is used for both input and output.
  *     The original glyph metrics, if any, in font units.  If metrics are
  *     not available all the values must be set to zero.
  *
  * @output:
  *   ametrics ::
  *     The replacement glyph metrics in font units.
  *
  */
  typedef FT_Error
  (*FT_Incremental_GetGlyphMetricsFunc)
                      ( FT_Incremental              incremental,
                        FT_UInt                     glyph_index,
                        FT_Bool                     vertical,
                        FT_Incremental_MetricsRec  *ametrics );


  /**************************************************************************
   *
   * @struct:
   *   FT_Incremental_FuncsRec
   *
   * @description:
   *   A table of functions for accessing fonts that load data
   *   incrementally.  Used in @FT_Incremental_InterfaceRec.
   *
   * @fields:
   *   get_glyph_data ::
   *     The function to get glyph data.  Must not be null.
   *
   *   free_glyph_data ::
   *     The function to release glyph data.  Must not be null.
   *
   *   get_glyph_metrics ::
   *     The function to get glyph metrics.  May be null if the font does
   *     not provide overriding glyph metrics.
   */
  typedef struct  FT_Incremental_FuncsRec_
  {
    FT_Incremental_GetGlyphDataFunc     get_glyph_data;
    FT_Incremental_FreeGlyphDataFunc    free_glyph_data;
    FT_Incremental_GetGlyphMetricsFunc  get_glyph_metrics;

  } FT_Incremental_FuncsRec;


 /***************************************************************************
  *
  * @struct:
  *   FT_Incremental_InterfaceRec
  *
  * @description:
  *   A structure to be used with @FT_Open_Face to indicate that the user
  *   wants to support incremental glyph loading.  You should use it with
  *   @FT_PARAM_TAG_INCREMENTAL as in the following example:
  *
  *     {
  *       FT_Incremental_InterfaceRec  inc_int;
  *       FT_Parameter                 parameter;
  *       FT_Open_Args                 open_args;
  *
  *
  *       // set up incremental descriptor
  *       inc_int.funcs  = my_funcs;
  *       inc_int.object = my_object;
  *
  *       // set up optional parameter
  *       parameter.tag  = FT_PARAM_TAG_INCREMENTAL;
  *       parameter.data = &inc_int;
  *
  *       // set up FT_Open_Args structure
  *       open_args.flags      = FT_OPEN_PATHNAME | FT_OPEN_PARAMS;
  *       open_args.pathname   = my_font_pathname;
  *       open_args.num_params = 1;
  *       open_args.params     = &parameter; // we use one optional argument
  *
  *       // open the font
  *       error = FT_Open_Face( library, &open_args, index, &face );
  *       ...
  *     }
  */
  typedef struct  FT_Incremental_InterfaceRec_
  {
    const FT_Incremental_FuncsRec*  funcs;
    FT_Incremental                  object;

  } FT_Incremental_InterfaceRec;


 /***************************************************************************
  *
  * @type:
  *   FT_Incremental_Interface
  *
  * @description:
  *   A pointer to an @FT_Incremental_InterfaceRec structure.
  *
  */
  typedef FT_Incremental_InterfaceRec*   FT_Incremental_Interface;


 /***************************************************************************
  *
  * @constant:
  *   FT_PARAM_TAG_INCREMENTAL
  *
  * @description:
  *   A constant used as the tag of @FT_Parameter structures to indicate
  *   an incremental loading object to be used by FreeType.
  *
  */
#define FT_PARAM_TAG_INCREMENTAL  FT_MAKE_TAG( 'i', 'n', 'c', 'r' )

 /* */

FT_END_HEADER

#endif /* __FTINCREM_H__ */


/* END */

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