2 * Copyright © 2009,2010 Red Hat, Inc.
3 * Copyright © 2010,2011,2013 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
31 #ifndef HB_NO_OT_SHAPE
33 #include "hb-ot-map.hh"
34 #include "hb-ot-shape.hh"
35 #include "hb-ot-layout.hh"
38 void hb_ot_map_t::collect_lookups (unsigned int table_index, hb_set_t *lookups_out) const
40 for (unsigned int i = 0; i < lookups[table_index].length; i++)
41 lookups_out->add (lookups[table_index][i].index);
45 hb_ot_map_builder_t::hb_ot_map_builder_t (hb_face_t *face_,
46 const hb_segment_properties_t &props_)
48 hb_memset (this, 0, sizeof (*this));
50 feature_infos.init ();
51 for (unsigned int table_index = 0; table_index < 2; table_index++)
52 stages[table_index].init ();
57 /* Fetch script/language indices for GSUB/GPOS. We need these later to skip
58 * features not available in either table and not waste precious bits for them. */
60 unsigned int script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
61 unsigned int language_count = HB_OT_MAX_TAGS_PER_LANGUAGE;
62 hb_tag_t script_tags[HB_OT_MAX_TAGS_PER_SCRIPT];
63 hb_tag_t language_tags[HB_OT_MAX_TAGS_PER_LANGUAGE];
65 hb_ot_tags_from_script_and_language (props.script,
72 for (unsigned int table_index = 0; table_index < 2; table_index++)
74 hb_tag_t table_tag = table_tags[table_index];
75 found_script[table_index] = (bool) hb_ot_layout_table_select_script (face,
79 &script_index[table_index],
80 &chosen_script[table_index]);
81 hb_ot_layout_script_select_language (face,
83 script_index[table_index],
86 &language_index[table_index]);
90 hb_ot_map_builder_t::~hb_ot_map_builder_t ()
92 feature_infos.fini ();
93 for (unsigned int table_index = 0; table_index < 2; table_index++)
94 stages[table_index].fini ();
97 void hb_ot_map_builder_t::add_feature (hb_tag_t tag,
98 hb_ot_map_feature_flags_t flags,
101 if (unlikely (!tag)) return;
102 feature_info_t *info = feature_infos.push();
104 info->seq = feature_infos.length;
105 info->max_value = value;
107 info->default_value = (flags & F_GLOBAL) ? value : 0;
108 info->stage[0] = current_stage[0];
109 info->stage[1] = current_stage[1];
112 bool hb_ot_map_builder_t::has_feature (hb_tag_t tag)
114 for (unsigned int table_index = 0; table_index < 2; table_index++)
116 if (hb_ot_layout_language_find_feature (face,
117 table_tags[table_index],
118 script_index[table_index],
119 language_index[table_index],
128 hb_ot_map_builder_t::add_lookups (hb_ot_map_t &m,
129 unsigned int table_index,
130 unsigned int feature_index,
131 unsigned int variations_index,
137 hb_tag_t feature_tag)
139 unsigned int lookup_indices[32];
140 unsigned int offset, len;
141 unsigned int table_lookup_count;
143 table_lookup_count = hb_ot_layout_table_get_lookup_count (face, table_tags[table_index]);
147 len = ARRAY_LENGTH (lookup_indices);
148 hb_ot_layout_feature_with_variations_get_lookups (face,
149 table_tags[table_index],
155 for (unsigned int i = 0; i < len; i++)
157 if (lookup_indices[i] >= table_lookup_count)
159 hb_ot_map_t::lookup_map_t *lookup = m.lookups[table_index].push ();
161 lookup->index = lookup_indices[i];
162 lookup->auto_zwnj = auto_zwnj;
163 lookup->auto_zwj = auto_zwj;
164 lookup->random = random;
165 lookup->per_syllable = per_syllable;
166 lookup->feature_tag = feature_tag;
170 } while (len == ARRAY_LENGTH (lookup_indices));
174 void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func)
176 stage_info_t *s = stages[table_index].push ();
177 s->index = current_stage[table_index];
178 s->pause_func = pause_func;
180 current_stage[table_index]++;
184 hb_ot_map_builder_t::compile (hb_ot_map_t &m,
185 const hb_ot_shape_plan_key_t &key)
187 unsigned int global_bit_shift = 8 * sizeof (hb_mask_t) - 1;
188 unsigned int global_bit_mask = 1u << global_bit_shift;
190 m.global_mask = global_bit_mask;
192 unsigned int required_feature_index[2];
193 hb_tag_t required_feature_tag[2];
194 /* We default to applying required feature in stage 0. If the required
195 * feature has a tag that is known to the shaper, we apply required feature
196 * in the stage for that tag.
198 unsigned int required_feature_stage[2] = {0, 0};
200 for (unsigned int table_index = 0; table_index < 2; table_index++)
202 m.chosen_script[table_index] = chosen_script[table_index];
203 m.found_script[table_index] = found_script[table_index];
205 hb_ot_layout_language_get_required_feature (face,
206 table_tags[table_index],
207 script_index[table_index],
208 language_index[table_index],
209 &required_feature_index[table_index],
210 &required_feature_tag[table_index]);
213 /* Sort features and merge duplicates */
214 if (feature_infos.length)
217 feature_infos.qsort ();
218 auto *f = feature_infos.arrayZ;
220 unsigned count = feature_infos.length;
221 for (unsigned int i = 1; i < count; i++)
222 if (f[i].tag != f[j].tag)
225 if (f[i].flags & F_GLOBAL) {
226 f[j].flags |= F_GLOBAL;
227 f[j].max_value = f[i].max_value;
228 f[j].default_value = f[i].default_value;
230 if (f[j].flags & F_GLOBAL)
231 f[j].flags ^= F_GLOBAL;
232 f[j].max_value = hb_max (f[j].max_value, f[i].max_value);
233 /* Inherit default_value from j */
235 f[j].flags |= (f[i].flags & F_HAS_FALLBACK);
236 f[j].stage[0] = hb_min (f[j].stage[0], f[i].stage[0]);
237 f[j].stage[1] = hb_min (f[j].stage[1], f[i].stage[1]);
239 feature_infos.shrink (j + 1);
242 hb_map_t feature_indices[2];
243 for (unsigned int table_index = 0; table_index < 2; table_index++)
244 hb_ot_layout_collect_features_map (face,
245 table_tags[table_index],
246 script_index[table_index],
247 language_index[table_index],
248 &feature_indices[table_index]);
250 /* Allocate bits now */
251 static_assert ((!(HB_GLYPH_FLAG_DEFINED & (HB_GLYPH_FLAG_DEFINED + 1))), "");
252 unsigned int next_bit = hb_popcount (HB_GLYPH_FLAG_DEFINED) + 1;
254 unsigned count = feature_infos.length;
255 for (unsigned int i = 0; i < count; i++)
257 const feature_info_t *info = &feature_infos[i];
259 unsigned int bits_needed;
261 if ((info->flags & F_GLOBAL) && info->max_value == 1)
262 /* Uses the global bit */
265 /* Limit bits per feature. */
266 bits_needed = hb_min (HB_OT_MAP_MAX_BITS, hb_bit_storage (info->max_value));
268 if (!info->max_value || next_bit + bits_needed >= global_bit_shift)
269 continue; /* Feature disabled, or not enough bits. */
272 unsigned int feature_index[2];
273 for (unsigned int table_index = 0; table_index < 2; table_index++)
275 if (required_feature_tag[table_index] == info->tag)
276 required_feature_stage[table_index] = info->stage[table_index];
278 hb_codepoint_t *index;
279 if (feature_indices[table_index].has (info->tag, &index))
281 feature_index[table_index] = *index;
285 feature_index[table_index] = HB_OT_LAYOUT_NO_FEATURE_INDEX;
287 if (!found && (info->flags & F_GLOBAL_SEARCH))
289 for (unsigned int table_index = 0; table_index < 2; table_index++)
291 found |= (bool) hb_ot_layout_table_find_feature (face,
292 table_tags[table_index],
294 &feature_index[table_index]);
297 if (!found && !(info->flags & F_HAS_FALLBACK))
301 hb_ot_map_t::feature_map_t *map = m.features.push ();
303 map->tag = info->tag;
304 map->index[0] = feature_index[0];
305 map->index[1] = feature_index[1];
306 map->stage[0] = info->stage[0];
307 map->stage[1] = info->stage[1];
308 map->auto_zwnj = !(info->flags & F_MANUAL_ZWNJ);
309 map->auto_zwj = !(info->flags & F_MANUAL_ZWJ);
310 map->random = !!(info->flags & F_RANDOM);
311 map->per_syllable = !!(info->flags & F_PER_SYLLABLE);
312 if ((info->flags & F_GLOBAL) && info->max_value == 1) {
313 /* Uses the global bit */
314 map->shift = global_bit_shift;
315 map->mask = global_bit_mask;
317 map->shift = next_bit;
318 map->mask = (1u << (next_bit + bits_needed)) - (1u << next_bit);
319 next_bit += bits_needed;
320 m.global_mask |= (info->default_value << map->shift) & map->mask;
322 map->_1_mask = (1u << map->shift) & map->mask;
323 map->needs_fallback = !found;
325 //feature_infos.shrink (0); /* Done with these */
329 add_gsub_pause (nullptr);
330 add_gpos_pause (nullptr);
332 for (unsigned int table_index = 0; table_index < 2; table_index++)
334 /* Collect lookup indices for features */
335 auto &lookups = m.lookups[table_index];
337 unsigned int stage_index = 0;
338 unsigned int last_num_lookups = 0;
339 for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
341 if (required_feature_index[table_index] != HB_OT_LAYOUT_NO_FEATURE_INDEX &&
342 required_feature_stage[table_index] == stage)
343 add_lookups (m, table_index,
344 required_feature_index[table_index],
345 key.variations_index[table_index],
348 for (auto &feature : m.features)
350 if (feature.stage[table_index] == stage)
351 add_lookups (m, table_index,
352 feature.index[table_index],
353 key.variations_index[table_index],
358 feature.per_syllable,
362 /* Sort lookups and merge duplicates */
363 if (last_num_lookups + 1 < lookups.length)
365 lookups.as_array ().sub_array (last_num_lookups, lookups.length - last_num_lookups).qsort ();
367 unsigned int j = last_num_lookups;
368 for (unsigned int i = j + 1; i < lookups.length; i++)
369 if (lookups.arrayZ[i].index != lookups.arrayZ[j].index)
370 lookups.arrayZ[++j] = lookups.arrayZ[i];
373 lookups.arrayZ[j].mask |= lookups.arrayZ[i].mask;
374 lookups.arrayZ[j].auto_zwnj &= lookups.arrayZ[i].auto_zwnj;
375 lookups.arrayZ[j].auto_zwj &= lookups.arrayZ[i].auto_zwj;
377 lookups.shrink (j + 1);
380 last_num_lookups = lookups.length;
382 if (stage_index < stages[table_index].length && stages[table_index][stage_index].index == stage) {
383 hb_ot_map_t::stage_map_t *stage_map = m.stages[table_index].push ();
384 stage_map->last_lookup = last_num_lookups;
385 stage_map->pause_func = stages[table_index][stage_index].pause_func;