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

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• Hash : c462b32d
  Author :
  Date : 2013-02-15T07:51:47
  

  Disable automatic segment properties guessing
  
  Before, if one called hb_shape() without setting script, language, and
  direction on the buffer, hb_shape() was calling
  hb_buffer_guess_segment_properties() on the user's behalf to guess
  these.
  
  This is very dangerous, since any serious user of HarfBuzz must set
  these properly (specially important is direction).  So now, we don't
  guess properties by default.  People not setting direction will get
  an abort() now.  If the old behavior is desired (fragile, good for
  simple testing only), users can call
  hb_buffer_guess_segment_properties() on the buffer just before calling
  hb_shape().
  

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• src/hb-fallback-shape.cc

• /*
   * Copyright © 2011  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
   */
  
  #define HB_SHAPER fallback
  #include "hb-shaper-impl-private.hh"
  
  
  /*
   * shaper face data
   */
  
  struct hb_fallback_shaper_face_data_t {};
  
  hb_fallback_shaper_face_data_t *
  _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED)
  {
    return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
  }
  
  void
  _hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper font data
   */
  
  struct hb_fallback_shaper_font_data_t {};
  
  hb_fallback_shaper_font_data_t *
  _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED)
  {
    return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
  }
  
  void
  _hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper shape_plan data
   */
  
  struct hb_fallback_shaper_shape_plan_data_t {};
  
  hb_fallback_shaper_shape_plan_data_t *
  _hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
  					    const hb_feature_t *user_features HB_UNUSED,
  					    unsigned int        num_user_features HB_UNUSED)
  {
    return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
  }
  
  void
  _hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper
   */
  
  hb_bool_t
  _hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
  		    hb_font_t          *font,
  		    hb_buffer_t        *buffer,
  		    const hb_feature_t *features HB_UNUSED,
  		    unsigned int        num_features HB_UNUSED)
  {
    hb_codepoint_t space;
    font->get_glyph (' ', 0, &space);
  
    buffer->clear_positions ();
  
    unsigned int count = buffer->len;
  
    for (unsigned int i = 0; i < count; i++)
    {
      if (buffer->unicode->is_default_ignorable (buffer->info[i].codepoint)) {
        buffer->info[i].codepoint = space;
        buffer->pos[i].x_advance = 0;
        buffer->pos[i].y_advance = 0;
        continue;
      }
      font->get_glyph (buffer->info[i].codepoint, 0, &buffer->info[i].codepoint);
      font->get_glyph_advance_for_direction (buffer->info[i].codepoint,
  					   buffer->props.direction,
  					   &buffer->pos[i].x_advance,
  					   &buffer->pos[i].y_advance);
      font->subtract_glyph_origin_for_direction (buffer->info[i].codepoint,
  					       buffer->props.direction,
  					       &buffer->pos[i].x_offset,
  					       &buffer->pos[i].y_offset);
    }
  
    if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
      hb_buffer_reverse (buffer);
  
    return true;
  }
  

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