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#define HB_SHAPER fallback
28#include "hb-shaper-impl-private.hh"
29
30
31/*
32 * shaper face data
33 */
34
35struct hb_fallback_shaper_face_data_t {};
36
37hb_fallback_shaper_face_data_t *
38_hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED)
39{
40  return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
41}
42
43void
44_hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED)
45{
46}
47
48
49/*
50 * shaper font data
51 */
52
53struct hb_fallback_shaper_font_data_t {};
54
55hb_fallback_shaper_font_data_t *
56_hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED)
57{
58  return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
59}
60
61void
62_hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED)
63{
64}
65
66
67/*
68 * shaper shape_plan data
69 */
70
71struct hb_fallback_shaper_shape_plan_data_t {};
72
73hb_fallback_shaper_shape_plan_data_t *
74_hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
75					    const hb_feature_t *user_features HB_UNUSED,
76					    unsigned int        num_user_features HB_UNUSED)
77{
78  return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
79}
80
81void
82_hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED)
83{
84}
85
86
87/*
88 * shaper
89 */
90
91hb_bool_t
92_hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
93		    hb_font_t          *font,
94		    hb_buffer_t        *buffer,
95		    const hb_feature_t *features HB_UNUSED,
96		    unsigned int        num_features HB_UNUSED)
97{
98  hb_codepoint_t space;
99  font->get_glyph (' ', 0, &space);
100
101  buffer->clear_positions ();
102
103  unsigned int count = buffer->len;
104
105  for (unsigned int i = 0; i < count; i++)
106  {
107    if (buffer->unicode->is_default_ignorable (buffer->info[i].codepoint)) {
108      buffer->info[i].codepoint = space;
109      buffer->pos[i].x_advance = 0;
110      buffer->pos[i].y_advance = 0;
111      continue;
112    }
113    font->get_glyph (buffer->info[i].codepoint, 0, &buffer->info[i].codepoint);
114    font->get_glyph_advance_for_direction (buffer->info[i].codepoint,
115					   buffer->props.direction,
116					   &buffer->pos[i].x_advance,
117					   &buffer->pos[i].y_advance);
118    font->subtract_glyph_origin_for_direction (buffer->info[i].codepoint,
119					       buffer->props.direction,
120					       &buffer->pos[i].x_offset,
121					       &buffer->pos[i].y_offset);
122  }
123
124  if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
125    hb_buffer_reverse (buffer);
126
127  return true;
128}
129