kc3-lang/freetype/src/autofit/ft-hb-ft.c

Branch - branch -masterv2.13

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• Hash : e9d03072
  Author :
  Date : 2025-04-26T19:05:31
  

  [autofit] Some preparations for loading HarfBuzz dynamically. (2/4)
  
  Pass `AF_FaceGlobals` to many functions, or provide it, tagged with
  `FT_UNUSED`.  We need this later on to access a dynamically linked HarfBuzz
  library.
  
  * src/autofit/ft-hb-ft.h (ft_hb_ft_font_create): Use `globals` argument.
    Drop unused `destroy` argument.
  * src/autofit/ft-hb-ft.c (ft_hb_ft_face_create, ft_hb_ft_font_create): Use
    `globals` argument.
    Drop unused `destroy` argument.
    (ft_hb_ft_face_create, ft_hb_ft_reference_table): Cast `user_data` to
    `AF_FaceGlobals`.
  
  * src/autofit/afadjust.c (af_get_glyph_alternates_helper,
    af_get_glyph_alternates): Add `globals` argument.
    Update callers.
  
  * src/autofit/afshaper.c, src/autofit/afshaper.h (af_shaper_buf_create,
    af_shaper_buf_destroy): Use `globals` argument.
  
  * src/autofit/afglobal.c (af_face_globals_new): Updated.
  
  * src/autofit/afcjk.c (af_cjk_metrics_init_widths,
    af_cjk_metrics_init_blues, af_cjk_metrics_check_digits): Updated.
  * src/autofit/aflatin.c (af_latin_metrics_init_widths,
    af_latin_metrics_init_blues, af_latin_metrics_check_digits): Updated.
  

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• src/autofit/ft-hb-ft.c

• /*
   * Copyright © 2009, 2023  Red Hat, Inc.
   * Copyright © 2015  Google, Inc.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Red Hat Author(s): Behdad Esfahbod, Matthias Clasen
   * Google Author(s): Behdad Esfahbod
   */
  
  #include <freetype/freetype.h>
  #include <freetype/tttables.h>
  
  #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
  
  #include "ft-hb-ft.h"
  
  /* The following three functions are a more or less verbatim
   * copy of corresponding HarfBuzz code from hb-ft.cc
   */
  
  static hb_blob_t *
  ft_hb_ft_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
  {
    AF_FaceGlobals globals = (AF_FaceGlobals) user_data;
  
    FT_Face ft_face = globals->face;
    FT_Byte *buffer;
    FT_ULong  length = 0;
    FT_Error error;
  
    FT_UNUSED (face);
  
    /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */
  
    error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
    if (error)
      return NULL;
  
    buffer = (FT_Byte *) ft_smalloc (length);
    if (!buffer)
      return NULL;
  
    error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
    if (error)
    {
      free (buffer);
      return NULL;
    }
  
    return hb(blob_create) ((const char *) buffer, length,
                            HB_MEMORY_MODE_WRITABLE,
                            buffer, ft_sfree);
  }
  
  static hb_face_t *
  ft_hb_ft_face_create (AF_FaceGlobals globals)
  {
    FT_Face ft_face = globals->face;
  
    hb_face_t *face;
  
    if (!ft_face->stream->read) {
      hb_blob_t *blob;
  
      blob = hb(blob_create) ((const char *) ft_face->stream->base,
                              (unsigned int) ft_face->stream->size,
                              HB_MEMORY_MODE_READONLY,
                              ft_face, NULL);
      face = hb(face_create) (blob, ft_face->face_index);
      hb(blob_destroy) (blob);
    } else {
      face = hb(face_create_for_tables) (ft_hb_ft_reference_table, globals, NULL);
    }
  
    hb(face_set_index) (face, ft_face->face_index);
    hb(face_set_upem) (face, ft_face->units_per_EM);
  
    return face;
  }
  
  FT_LOCAL_DEF(hb_font_t *)
  ft_hb_ft_font_create (AF_FaceGlobals globals)
  {
    hb_font_t *font;
    hb_face_t *face;
  
    face = ft_hb_ft_face_create (globals);
    font = hb(font_create) (face);
    hb(face_destroy) (face);
    return font;
  }
  
  #else /* !FT_CONFIG_OPTION_USE_HARFBUZZ */
  
  /* ANSI C doesn't like empty source files */
  typedef int  ft_hb_ft_dummy_;
  
  #endif /* !FT_CONFIG_OPTION_USE_HARFBUZZ */
  
  /* END */
  

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