kc3-lang/harfbuzz/src/hb-ot-shape.cc

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• Hash : 22da7fd9
  Author :
  Date : 2010-05-12T18:23:21
  

  Rename a few files to be C++ sources
  
  In anticipation for buffer revamp coming.
  

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• src/hb-ot-shape.cc

• /*
   * Copyright (C) 2009  Red Hat, 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.
   *
   * Red Hat Author(s): Behdad Esfahbod
   */
  
  #include "hb-ot-shape-private.hh"
  
  #include "hb-buffer-private.hh"
  
  #include "hb-ot-layout.h"
  
  hb_tag_t default_features[] = {
    /* GSUB */
    HB_TAG('c','c','m','p'),
    HB_TAG('l','o','c','l'),
    HB_TAG('l','i','g','a'),
    HB_TAG('c','l','i','g'),
    /* GPOS */
    HB_TAG('k','e','r','n'),
    HB_TAG('m','a','r','k'),
    HB_TAG('m','k','m','k'),
  };
  
  
  static void
  add_feature (hb_face_t    *face,
  	     hb_tag_t      table_tag,
  	     unsigned int  feature_index,
  	     unsigned int *lookups,
  	     unsigned int *num_lookups,
  	     unsigned int  room_lookups)
  {
    unsigned int i = room_lookups - *num_lookups;
    hb_ot_layout_feature_get_lookup_indexes (face, table_tag, feature_index, 0,
  					   &i,
  					   lookups + *num_lookups);
    *num_lookups += i;
  }
  
  static int
  cmp_lookups (const void *p1, const void *p2)
  {
    unsigned int a = * (const unsigned int *) p1;
    unsigned int b = * (const unsigned int *) p2;
  
    return a - b;
  }
  
  static void
  setup_lookups (hb_face_t    *face,
  	       hb_buffer_t  *buffer,
  	       hb_feature_t *features,
  	       unsigned int  num_features,
  	       hb_tag_t      table_tag,
  	       unsigned int *lookups,
  	       unsigned int *num_lookups)
  {
    unsigned int i, j, script_index, language_index, feature_index, room_lookups;
  
    room_lookups = *num_lookups;
    *num_lookups = 0;
  
    hb_ot_layout_table_choose_script (face, table_tag,
  				    hb_ot_tags_from_script (buffer->script),
  				    &script_index);
    hb_ot_layout_script_find_language (face, table_tag, script_index,
  				     hb_ot_tag_from_language (buffer->language),
  				     &language_index);
  
    if (hb_ot_layout_language_get_required_feature_index (face, table_tag, script_index, language_index,
  							&feature_index))
      add_feature (face, table_tag, feature_index, lookups, num_lookups, room_lookups);
  
    for (i = 0; i < ARRAY_LENGTH (default_features); i++)
    {
      if (hb_ot_layout_language_find_feature (face, table_tag, script_index, language_index,
  					    default_features[i],
  					    &feature_index))
        add_feature (face, table_tag, feature_index, lookups, num_lookups, room_lookups);
    }
  
    qsort (lookups, *num_lookups, sizeof (lookups[0]), cmp_lookups);
  
    if (*num_lookups)
    {
      for (i = 1, j = 0; i < *num_lookups; i++)
        if (lookups[i] != lookups[j])
  	lookups[++j] = lookups[i];
      lookups[j++] = lookups[i - 1];
      *num_lookups = j;
    }
  }
  
  
  hb_bool_t
  _hb_ot_substitute_complex (hb_font_t    *font HB_UNUSED,
  			   hb_face_t    *face,
  			   hb_buffer_t  *buffer,
  			   hb_feature_t *features,
  			   unsigned int  num_features)
  {
    unsigned int lookups[1000];
    unsigned int num_lookups = ARRAY_LENGTH (lookups);
    unsigned int i;
  
    if (!hb_ot_layout_has_substitution (face))
      return FALSE;
  
    setup_lookups (face, buffer, features, num_features,
  		 HB_OT_TAG_GSUB,
  		 lookups, &num_lookups);
  
    for (i = 0; i < num_lookups; i++)
      hb_ot_layout_substitute_lookup (face, buffer, lookups[i], 0xFFFF);
  
    return TRUE;
  }
  
  hb_bool_t
  _hb_ot_position_complex (hb_font_t    *font,
  			 hb_face_t    *face,
  			 hb_buffer_t  *buffer,
  			 hb_feature_t *features,
  			 unsigned int  num_features)
  {
    unsigned int lookups[1000];
    unsigned int num_lookups = ARRAY_LENGTH (lookups);
    unsigned int i;
  
    if (!hb_ot_layout_has_positioning (face))
      return FALSE;
  
    setup_lookups (face, buffer, features, num_features,
  		 HB_OT_TAG_GPOS,
  		 lookups, &num_lookups);
  
    for (i = 0; i < num_lookups; i++)
      hb_ot_layout_position_lookup (font, face, buffer, lookups[i], 0xFFFF);
  
    hb_ot_layout_position_finish (font, face, buffer);
  
    return TRUE;
  }
  

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