Add an exponential backoff to rechecking the app list doodle.
[chromium-blink-merge.git] / third_party / harfbuzz-ng / src / hb-fallback-shape.cc
blob9d061a9e8459cffdc53a20dd41aa7cbb0c0e2229
1 /*
2 * Copyright © 2011 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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.
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.
24 * Google Author(s): Behdad Esfahbod
27 #define HB_SHAPER fallback
28 #include "hb-shaper-impl-private.hh"
32 * shaper face data
35 struct hb_fallback_shaper_face_data_t {};
37 hb_fallback_shaper_face_data_t *
38 _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED)
40 return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
43 void
44 _hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED)
50 * shaper font data
53 struct hb_fallback_shaper_font_data_t {};
55 hb_fallback_shaper_font_data_t *
56 _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED)
58 return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
61 void
62 _hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED)
68 * shaper shape_plan data
71 struct hb_fallback_shaper_shape_plan_data_t {};
73 hb_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)
78 return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
81 void
82 _hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED)
88 * shaper
91 hb_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)
98 /* TODO
100 * - Apply fallback kern.
101 * - Handle Variation Selectors?
102 * - Apply normalization?
104 * This will make the fallback shaper into a dumb "TrueType"
105 * shaper which many people unfortunately still request.
108 hb_codepoint_t space;
109 bool has_space = font->get_glyph (' ', 0, &space);
111 buffer->clear_positions ();
113 hb_direction_t direction = buffer->props.direction;
114 hb_unicode_funcs_t *unicode = buffer->unicode;
115 unsigned int count = buffer->len;
116 hb_glyph_info_t *info = buffer->info;
117 hb_glyph_position_t *pos = buffer->pos;
118 for (unsigned int i = 0; i < count; i++)
120 if (has_space && unicode->is_default_ignorable (info[i].codepoint)) {
121 info[i].codepoint = space;
122 pos[i].x_advance = 0;
123 pos[i].y_advance = 0;
124 continue;
126 font->get_glyph (info[i].codepoint, 0, &info[i].codepoint);
127 font->get_glyph_advance_for_direction (info[i].codepoint,
128 direction,
129 &pos[i].x_advance,
130 &pos[i].y_advance);
131 font->subtract_glyph_origin_for_direction (info[i].codepoint,
132 direction,
133 &pos[i].x_offset,
134 &pos[i].y_offset);
137 if (HB_DIRECTION_IS_BACKWARD (direction))
138 hb_buffer_reverse (buffer);
140 return true;