kc3-lang/freetype/src/sfnt/ttcolr.h

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• Hash : 47cf8ebf
  Author :
  Date : 2021-07-28T17:36:57
  

  [sfnt] Add API for retrieving a 'COLR' v1 'ClipBox' table.
  
  The optional 'COLR' v1 glyph-specific clip box helps upstream graphics
  libraries allocate a sufficiently large bitmap for a glyph without having to
  traverse the glyph graph for that.  See
  
    https://github.com/googlefonts/colr-gradients-spec/issues/251
  
  for background on the introduction of this specification change.
  
  * include/freetype/ftcolor.h (FT_ClipBox): New structure.
  (FT_Get_Color_Glyph_ClipBox): New function declaration.
  
  * include/freetype/internal/sfnt.h (TT_Get_Color_Glyph_ClipBox_Func):
  New function type.
  (SFNT_Interface, FT_DEFINE_SFNT_INTERFACE): Use it.
  
  * src/base/ftobjs.c (FT_Get_Color_Glyph_ClipBox): New function to link API
  with SFNT implementation.
  
  * src/sfnt/sfdriver.c (sfnt_interface): Updated.
  * src/sfnt/ttcolr.c (Colr): New field `clip_list`.
  (tt_face_load_colr): Parse global clip list offset.
  (tt_face_get_color_glyph_clipbox): New function to find the clip box for a
  glyph id from the clip list array.
  * src/sfnt/ttcolr.h: Updated.
  

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• src/sfnt/ttcolr.h

• /****************************************************************************
   *
   * ttcolr.h
   *
   *   TrueType and OpenType colored glyph layer support (specification).
   *
   * Copyright (C) 2018-2021 by
   * David Turner, Robert Wilhelm, and Werner Lemberg.
   *
   * Originally written by Shao Yu Zhang <shaozhang@fb.com>.
   *
   * 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 __TTCOLR_H__
  #define __TTCOLR_H__
  
  
  #include "ttload.h"
  
  
  FT_BEGIN_HEADER
  
  
    FT_LOCAL( FT_Error )
    tt_face_load_colr( TT_Face    face,
                       FT_Stream  stream );
  
    FT_LOCAL( void )
    tt_face_free_colr( TT_Face  face );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_colr_layer( TT_Face            face,
                            FT_UInt            base_glyph,
                            FT_UInt           *aglyph_index,
                            FT_UInt           *acolor_index,
                            FT_LayerIterator*  iterator );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_colr_glyph_paint( TT_Face                  face,
                                  FT_UInt                  base_glyph,
                                  FT_Color_Root_Transform  root_transform,
                                  FT_OpaquePaint*          paint );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_color_glyph_clipbox( TT_Face      face,
                                     FT_UInt      base_glyph,
                                     FT_ClipBox*  clip_box );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_paint_layers( TT_Face            face,
                              FT_LayerIterator*  iterator,
                              FT_OpaquePaint*    paint );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_colorline_stops( TT_Face                face,
                                 FT_ColorStop*          color_stop,
                                 FT_ColorStopIterator*  iterator );
  
    FT_LOCAL( FT_Bool )
    tt_face_get_paint( TT_Face         face,
                       FT_OpaquePaint  opaque_paint,
                       FT_COLR_Paint*  paint );
  
    FT_LOCAL( FT_Error )
    tt_face_colr_blend_layer( TT_Face       face,
                              FT_UInt       color_index,
                              FT_GlyphSlot  dstSlot,
                              FT_GlyphSlot  srcSlot );
  
  
  FT_END_HEADER
  
  
  #endif /* __TTCOLR_H__ */
  
  /* END */
  

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