kc3-lang/freetype/src/autofit/afgsub.h

Branch - branch -masterv2.13

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• Hash : cda418a4
  Author :
  Date : 2025-06-13T11:23:14
  

  [autofit] Speed up computation of `af_reverse_character_map_new`. (1/4)
  
  Using HarfBuzz's API functions to construct the reverse map is too slow; we
  have to call `hb_ot_layout_lookup_get_glyph_alternates` far too often
  because it can only handle a single glyph at a time.  For this reason we are
  going to parse the GSUB table by ourselves.
  
  The new non-local functions are `af_parse_gsub` and `af_map_lookup`.
  
  * src/autofit/afgsub.c, src/autofit/afgsub.h: New files for parsing,
    validating, and mapping the `SingleSubst` and `AlternateSubst` subtable
    types of a GSUB table.
  
  * src/autofit/autofit.c, src/autofit/rules.mk (AUTOF_DRV_SRC): Updated.
  

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• src/autofit/afgsub.h

• /****************************************************************************
   *
   * afgsub.h
   *
   *   Auto-fitter routines to parse the GSUB table (header).
   *
   * Copyright (C) 2025 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 AFGSUB_H_
  #define AFGSUB_H_
  
  #include "afglobal.h"
  
  
  FT_BEGIN_HEADER
  
    FT_LOCAL( void )
    af_parse_gsub( AF_FaceGlobals  globals );
  
    FT_LOCAL( FT_Error )
    af_map_lookup( AF_FaceGlobals  globals,
                   FT_Hash         map,
                   FT_UInt32       lookup_offset );
  
  FT_END_HEADER
  
  #endif /* AFGSUB_H_ */
  
  /* END */
  

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