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 *
_hb_fallback_shaper_face_data_create(hb_face_t * face HB_UNUSED)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
_hb_fallback_shaper_face_data_destroy(hb_fallback_face_data_t * data HB_UNUSED)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 *
_hb_fallback_shaper_font_data_create(hb_font_t * font HB_UNUSED)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
_hb_fallback_shaper_font_data_destroy(hb_fallback_font_data_t * data HB_UNUSED)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
_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)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
116