afgsub.h

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Author : Werner Lemberg
Date : 2025-06-13 11:23:14
Hash : cda418a4
Message : [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.

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 */

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

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