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

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• Author : Behdad Esfahbod
  Date : 2017-11-10 17:14:27
  Hash : e4da3802
  Message : [coretext/uniscribe/directwrite/graphite/fallback] Update for unsafe-to-break Fixes https://github.com/behdad/harfbuzz/issues/615 We'll see which bots I broke.

• 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"
  
  
  HB_SHAPER_DATA_ENSURE_DEFINE(fallback, face)
  HB_SHAPER_DATA_ENSURE_DEFINE(fallback, font)
  
  
  /*
   * 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,
  					    const int          *coords HB_UNUSED,
  					    unsigned int        num_coords 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)
  {
    /* TODO
     *
     * - Apply fallback kern.
     * - Handle Variation Selectors?
     * - Apply normalization?
     *
     * This will make the fallback shaper into a dumb "TrueType"
     * shaper which many people unfortunately still request.
     */
  
    hb_codepoint_t space;
    bool has_space = (bool) font->get_nominal_glyph (' ', &space);
  
    buffer->clear_positions ();
  
    hb_direction_t direction = buffer->props.direction;
    hb_unicode_funcs_t *unicode = buffer->unicode;
    unsigned int count = buffer->len;
    hb_glyph_info_t *info = buffer->info;
    hb_glyph_position_t *pos = buffer->pos;
    for (unsigned int i = 0; i < count; i++)
    {
      if (has_space && unicode->is_default_ignorable (info[i].codepoint)) {
        info[i].codepoint = space;
        pos[i].x_advance = 0;
        pos[i].y_advance = 0;
        continue;
      }
      (void) font->get_nominal_glyph (info[i].codepoint, &info[i].codepoint);
      font->get_glyph_advance_for_direction (info[i].codepoint,
  					   direction,
  					   &pos[i].x_advance,
  					   &pos[i].y_advance);
      font->subtract_glyph_origin_for_direction (info[i].codepoint,
  					       direction,
  					       &pos[i].x_offset,
  					       &pos[i].y_offset);
    }
  
    if (HB_DIRECTION_IS_BACKWARD (direction))
      hb_buffer_reverse (buffer);
  
    buffer->safe_to_break_all ();
  
    return true;
  }