tor-browser

The Tor Browser
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hb-fallback-shape.cc (3127B)

      1 /*
      2 * Copyright © 2011  Google, Inc.
      3 *
      4 *  This is part of HarfBuzz, a text shaping library.
      5 *
      6 * Permission is hereby granted, without written agreement and without
      7 * license or royalty fees, to use, copy, modify, and distribute this
      8 * software and its documentation for any purpose, provided that the
      9 * above copyright notice and the following two paragraphs appear in
     10 * all copies of this software.
     11 *
     12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16 * DAMAGE.
     17 *
     18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23 *
     24 * Google Author(s): Behdad Esfahbod
     25 */
     26 
     27 #include "hb-shaper-impl.hh"
     28 
     29 #ifndef HB_NO_FALLBACK_SHAPE
     30 
     31 /*
     32 * shaper face data
     33 */
     34 
     35 struct hb_fallback_face_data_t {};
     36 
     37 hb_fallback_face_data_t *
     38 _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED)
     39 {
     40  return (hb_fallback_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
     41 }
     42 
     43 void
     44 _hb_fallback_shaper_face_data_destroy (hb_fallback_face_data_t *data HB_UNUSED)
     45 {
     46 }
     47 
     48 
     49 /*
     50 * shaper font data
     51 */
     52 
     53 struct hb_fallback_font_data_t {};
     54 
     55 hb_fallback_font_data_t *
     56 _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED)
     57 {
     58  return (hb_fallback_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
     59 }
     60 
     61 void
     62 _hb_fallback_shaper_font_data_destroy (hb_fallback_font_data_t *data HB_UNUSED)
     63 {
     64 }
     65 
     66 
     67 /*
     68 * shaper
     69 */
     70 
     71 hb_bool_t
     72 _hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
     73 	    hb_font_t          *font,
     74 	    hb_buffer_t        *buffer,
     75 	    const hb_feature_t *features HB_UNUSED,
     76 	    unsigned int        num_features HB_UNUSED)
     77 {
     78  hb_codepoint_t space;
     79  bool has_space = (bool) font->get_nominal_glyph (' ', &space);
     80 
     81  buffer->clear_positions ();
     82 
     83  hb_direction_t direction = buffer->props.direction;
     84  hb_unicode_funcs_t *unicode = buffer->unicode;
     85  unsigned int count = buffer->len;
     86  hb_glyph_info_t *info = buffer->info;
     87  hb_glyph_position_t *pos = buffer->pos;
     88  for (unsigned int i = 0; i < count; i++)
     89  {
     90    if (has_space && unicode->is_default_ignorable (info[i].codepoint)) {
     91      info[i].codepoint = space;
     92      pos[i].x_advance = 0;
     93      pos[i].y_advance = 0;
     94      continue;
     95    }
     96    (void) font->get_nominal_glyph (info[i].codepoint, &info[i].codepoint);
     97    font->get_glyph_advance_for_direction (info[i].codepoint,
     98 				   direction,
     99 				   &pos[i].x_advance,
    100 				   &pos[i].y_advance);
    101    font->subtract_glyph_origin_for_direction (info[i].codepoint,
    102 				       direction,
    103 				       &pos[i].x_offset,
    104 				       &pos[i].y_offset);
    105  }
    106 
    107  if (HB_DIRECTION_IS_BACKWARD (direction))
    108    hb_buffer_reverse (buffer);
    109 
    110  buffer->clear_glyph_flags ();
    111 
    112  return true;
    113 }
    114 
    115 #endif