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-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