kc3-lang/harfbuzz/util/hb-fc.cc

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• Hash : 8e8ca03b
  Author :
  Date : 2023-01-16T12:38:53
  

  [hb-fc] Minor remove unused variable
  

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• util/hb-fc.cc

• /*
   * Copyright © 2014  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * 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.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #include <stdlib.h>
  #include <stdio.h>
  
  #include "hb-fc.h"
  
  static hb_bool_t
  hb_fc_get_glyph (hb_font_t *font /*HB_UNUSED*/,
  		 void *font_data,
  		 hb_codepoint_t unicode,
  		 hb_codepoint_t variation_selector,
  		 hb_codepoint_t *glyph,
  		 void *user_data /*HB_UNUSED*/)
  
  {
    FcCharSet *cs = (FcCharSet *) font_data;
  
    if (variation_selector)
    {
      /* Fontconfig doesn't cache cmap-14 info.  However:
       * 1. If the font maps the variation_selector, assume it's
       *    supported,
       * 2. If the font doesn't map it, still say it's supported,
       *    but return 0.  This way, the caller will see the zero
       *    and reject.  If we return unsupported here, then the
       *    variation selector will be hidden and ignored.
       */
      if (FcCharSetHasChar (cs, unicode) &&
  	FcCharSetHasChar (cs, variation_selector))
      {
        unsigned int var_num = 0;
        if (variation_selector - 0xFE00u < 16)
  	var_num = variation_selector - 0xFE00 + 1;
        else if (variation_selector - 0xE0100u < (256 - 16))
  	var_num = variation_selector - 0xE0100 + 17;
        *glyph = (var_num << 21) | unicode;
      }
      else
      {
        *glyph = 0;
      }
      return true;
    }
  
    *glyph = FcCharSetHasChar (cs, unicode) ? unicode : 0;
    return *glyph != 0;
  }
  
  static hb_font_funcs_t *
  _hb_fc_get_font_funcs ()
  {
    static const hb_font_funcs_t *fc_ffuncs;
  
    if (!fc_ffuncs)
    {
      hb_font_funcs_t *newfuncs = hb_font_funcs_create ();
  
      hb_font_funcs_set_glyph_func (newfuncs, hb_fc_get_glyph, nullptr, nullptr);
  
      /* XXX MT-unsafe */
      if (fc_ffuncs)
        hb_font_funcs_destroy (newfuncs);
      else
        fc_ffuncs = newfuncs;
    }
  
    return const_cast<hb_font_funcs_t *> (fc_ffuncs);
  }
  
  
  hb_font_t *
  hb_fc_font_create (FcPattern *fcfont)
  {
    static hb_face_t *face;
    hb_font_t *font;
  
    FcCharSet *cs;
    if (FcResultMatch != FcPatternGetCharSet (fcfont, FC_CHARSET, 0, &cs))
      return hb_font_get_empty ();
  
    if (!face) /* XXX MT-unsafe */
      face = hb_face_create (hb_blob_get_empty (), 0);
  
    font = hb_font_create (face);
  
    hb_font_set_funcs (font,
  		     _hb_fc_get_font_funcs (),
  		     FcCharSetCopy (cs),
  		     (hb_destroy_func_t) FcCharSetDestroy);
  
    return font;
  }
  
  hb_bool_t
  hb_fc_can_render (hb_font_t *font, const char *text)
  {
    static const char *ot[] = {"ot", nullptr};
  
    hb_buffer_t *buffer = hb_buffer_create ();
    hb_buffer_add_utf8 (buffer, text, -1, 0, -1);
  
    /* XXX Do we need this?  I think Arabic and Hangul shapers are the
     * only one that make any use of this.  The Hangul case is not really
     * needed, and for Arabic we'll miss a very narrow set of fonts.
     * Might be better to force generic shaper perhaps. */
    hb_buffer_guess_segment_properties (buffer);
  
    if (!hb_shape_full (font, buffer, nullptr, 0, ot))
      abort (); /* hb-ot shaper not enabled? */
  
    unsigned int len;
    hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &len);
    for (unsigned int i = 0; i < len; i++)
     {
      if (!info[i].codepoint)
       {
        return false;
       }
     }
  
    return true;
  }
  

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