src/hb-fallback-shape.cc

   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-fallback-shape-private.hh"
  28
  29 #include "hb-buffer-private.hh"
  30
  31 hb_bool_t
  32 _hb_fallback_shape (hb_font_t          *font,
  33                     hb_buffer_t        *buffer,
  34                     const hb_feature_t *features HB_UNUSED,
  35                     unsigned int        num_features HB_UNUSED)
  36 {
  37   buffer->guess_properties ();
  38
  39   unsigned int count = buffer->len;
  40
  41   for (unsigned int i = 0; i < count; i++)
  42     hb_font_get_glyph (font, buffer->info[i].codepoint, 0, &buffer->info[i].codepoint);
  43
  44   buffer->clear_positions ();
  45
  46   for (unsigned int i = 0; i < count; i++) {
  47     hb_font_get_glyph_advance_for_direction (font, buffer->info[i].codepoint,
  48                                              buffer->props.direction,
  49                                              &buffer->pos[i].x_advance,
  50                                              &buffer->pos[i].y_advance);
  51     hb_font_subtract_glyph_origin_for_direction (font, buffer->info[i].codepoint,
  52                                                  buffer->props.direction,
  53                                                  &buffer->pos[i].x_offset,
  54                                                  &buffer->pos[i].y_offset);
  55   }
  56
  57   if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
  58     hb_buffer_reverse (buffer);
  59
  60   return true;
  61 }