338 lines
11 KiB
C++
338 lines
11 KiB
C++
/*
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2010,2011,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-ot-map-private.hh"
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#include "hb-ot-layout-private.hh"
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void hb_ot_map_t::collect_lookups (unsigned int table_index, hb_set_t *lookups_out) const
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{
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for (unsigned int i = 0; i < lookups[table_index].len; i++)
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hb_set_add (lookups_out, lookups[table_index][i].index);
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}
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hb_ot_map_builder_t::hb_ot_map_builder_t (hb_face_t *face_,
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const hb_segment_properties_t *props_)
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{
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memset (this, 0, sizeof (*this));
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face = face_;
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props = *props_;
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/* Fetch script/language indices for GSUB/GPOS. We need these later to skip
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* features not available in either table and not waste precious bits for them. */
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hb_tag_t script_tags[3] = {HB_TAG_NONE, HB_TAG_NONE, HB_TAG_NONE};
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hb_tag_t language_tag;
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hb_ot_tags_from_script (props.script, &script_tags[0], &script_tags[1]);
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language_tag = hb_ot_tag_from_language (props.language);
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for (unsigned int table_index = 0; table_index < 2; table_index++) {
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hb_tag_t table_tag = table_tags[table_index];
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found_script[table_index] = (bool) hb_ot_layout_table_choose_script (face, table_tag, script_tags, &script_index[table_index], &chosen_script[table_index]);
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hb_ot_layout_script_find_language (face, table_tag, script_index[table_index], language_tag, &language_index[table_index]);
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}
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}
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void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value,
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hb_ot_map_feature_flags_t flags)
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{
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feature_info_t *info = feature_infos.push();
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if (unlikely (!info)) return;
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if (unlikely (!tag)) return;
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info->tag = tag;
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info->seq = feature_infos.len;
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info->max_value = value;
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info->flags = flags;
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info->default_value = (flags & F_GLOBAL) ? value : 0;
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info->stage[0] = current_stage[0];
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info->stage[1] = current_stage[1];
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}
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void
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hb_ot_map_builder_t::add_lookups (hb_ot_map_t &m,
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hb_face_t *face,
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unsigned int table_index,
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unsigned int feature_index,
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unsigned int variations_index,
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hb_mask_t mask,
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bool auto_zwnj,
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bool auto_zwj)
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{
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unsigned int lookup_indices[32];
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unsigned int offset, len;
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unsigned int table_lookup_count;
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table_lookup_count = hb_ot_layout_table_get_lookup_count (face, table_tags[table_index]);
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offset = 0;
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do {
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len = ARRAY_LENGTH (lookup_indices);
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hb_ot_layout_feature_with_variations_get_lookups (face,
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table_tags[table_index],
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feature_index,
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variations_index,
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offset, &len,
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lookup_indices);
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for (unsigned int i = 0; i < len; i++)
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{
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if (lookup_indices[i] >= table_lookup_count)
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continue;
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hb_ot_map_t::lookup_map_t *lookup = m.lookups[table_index].push ();
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if (unlikely (!lookup))
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return;
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lookup->mask = mask;
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lookup->index = lookup_indices[i];
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lookup->auto_zwnj = auto_zwnj;
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lookup->auto_zwj = auto_zwj;
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}
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offset += len;
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} while (len == ARRAY_LENGTH (lookup_indices));
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}
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void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func)
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{
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stage_info_t *s = stages[table_index].push ();
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if (likely (s)) {
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s->index = current_stage[table_index];
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s->pause_func = pause_func;
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}
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current_stage[table_index]++;
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}
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void
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hb_ot_map_builder_t::compile (hb_ot_map_t &m,
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const int *coords,
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unsigned int num_coords)
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{
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ASSERT_STATIC (!(HB_GLYPH_FLAG_DEFINED & (HB_GLYPH_FLAG_DEFINED + 1)));
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unsigned int global_bit_mask = HB_GLYPH_FLAG_DEFINED + 1;
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unsigned int global_bit_shift = _hb_popcount32 (HB_GLYPH_FLAG_DEFINED);
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m.global_mask = global_bit_mask;
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unsigned int required_feature_index[2];
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hb_tag_t required_feature_tag[2];
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/* We default to applying required feature in stage 0. If the required
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* feature has a tag that is known to the shaper, we apply required feature
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* in the stage for that tag.
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*/
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unsigned int required_feature_stage[2] = {0, 0};
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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m.chosen_script[table_index] = chosen_script[table_index];
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m.found_script[table_index] = found_script[table_index];
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hb_ot_layout_language_get_required_feature (face,
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table_tags[table_index],
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script_index[table_index],
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language_index[table_index],
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&required_feature_index[table_index],
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&required_feature_tag[table_index]);
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}
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if (!feature_infos.len)
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return;
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/* Sort features and merge duplicates */
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{
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feature_infos.qsort ();
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unsigned int j = 0;
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for (unsigned int i = 1; i < feature_infos.len; i++)
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if (feature_infos[i].tag != feature_infos[j].tag)
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feature_infos[++j] = feature_infos[i];
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else {
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if (feature_infos[i].flags & F_GLOBAL) {
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feature_infos[j].flags |= F_GLOBAL;
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feature_infos[j].max_value = feature_infos[i].max_value;
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feature_infos[j].default_value = feature_infos[i].default_value;
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} else {
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feature_infos[j].flags &= ~F_GLOBAL;
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feature_infos[j].max_value = MAX (feature_infos[j].max_value, feature_infos[i].max_value);
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/* Inherit default_value from j */
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}
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feature_infos[j].flags |= (feature_infos[i].flags & F_HAS_FALLBACK);
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feature_infos[j].stage[0] = MIN (feature_infos[j].stage[0], feature_infos[i].stage[0]);
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feature_infos[j].stage[1] = MIN (feature_infos[j].stage[1], feature_infos[i].stage[1]);
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}
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feature_infos.shrink (j + 1);
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}
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/* Allocate bits now */
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unsigned int next_bit = global_bit_shift + 1;
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for (unsigned int i = 0; i < feature_infos.len; i++)
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{
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const feature_info_t *info = &feature_infos[i];
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unsigned int bits_needed;
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if ((info->flags & F_GLOBAL) && info->max_value == 1)
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/* Uses the global bit */
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bits_needed = 0;
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else
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/* Limit to 8 bits per feature. */
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bits_needed = MIN(8u, _hb_bit_storage (info->max_value));
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if (!info->max_value || next_bit + bits_needed > 8 * sizeof (hb_mask_t))
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continue; /* Feature disabled, or not enough bits. */
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hb_bool_t found = false;
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unsigned int feature_index[2];
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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if (required_feature_tag[table_index] == info->tag)
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required_feature_stage[table_index] = info->stage[table_index];
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found |= hb_ot_layout_language_find_feature (face,
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table_tags[table_index],
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script_index[table_index],
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language_index[table_index],
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info->tag,
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&feature_index[table_index]);
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}
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if (!found && (info->flags & F_GLOBAL_SEARCH))
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{
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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found |= hb_ot_layout_table_find_feature (face,
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table_tags[table_index],
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info->tag,
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&feature_index[table_index]);
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}
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}
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if (!found && !(info->flags & F_HAS_FALLBACK))
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continue;
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hb_ot_map_t::feature_map_t *map = m.features.push ();
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if (unlikely (!map))
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break;
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map->tag = info->tag;
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map->index[0] = feature_index[0];
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map->index[1] = feature_index[1];
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map->stage[0] = info->stage[0];
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map->stage[1] = info->stage[1];
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map->auto_zwnj = !(info->flags & F_MANUAL_ZWNJ);
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map->auto_zwj = !(info->flags & F_MANUAL_ZWJ);
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if ((info->flags & F_GLOBAL) && info->max_value == 1) {
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/* Uses the global bit */
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map->shift = global_bit_shift;
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map->mask = global_bit_mask;
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} else {
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map->shift = next_bit;
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map->mask = (1u << (next_bit + bits_needed)) - (1u << next_bit);
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next_bit += bits_needed;
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m.global_mask |= (info->default_value << map->shift) & map->mask;
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}
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map->_1_mask = (1u << map->shift) & map->mask;
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map->needs_fallback = !found;
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}
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feature_infos.shrink (0); /* Done with these */
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add_gsub_pause (NULL);
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add_gpos_pause (NULL);
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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/* Collect lookup indices for features */
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unsigned int variations_index;
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hb_ot_layout_table_find_feature_variations (face,
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table_tags[table_index],
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coords,
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num_coords,
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&variations_index);
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unsigned int stage_index = 0;
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unsigned int last_num_lookups = 0;
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for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
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{
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if (required_feature_index[table_index] != HB_OT_LAYOUT_NO_FEATURE_INDEX &&
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required_feature_stage[table_index] == stage)
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add_lookups (m, face, table_index,
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required_feature_index[table_index],
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variations_index,
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global_bit_mask);
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for (unsigned i = 0; i < m.features.len; i++)
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if (m.features[i].stage[table_index] == stage)
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add_lookups (m, face, table_index,
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m.features[i].index[table_index],
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variations_index,
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m.features[i].mask,
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m.features[i].auto_zwnj,
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m.features[i].auto_zwj);
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/* Sort lookups and merge duplicates */
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if (last_num_lookups < m.lookups[table_index].len)
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{
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m.lookups[table_index].qsort (last_num_lookups, m.lookups[table_index].len);
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unsigned int j = last_num_lookups;
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for (unsigned int i = j + 1; i < m.lookups[table_index].len; i++)
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if (m.lookups[table_index][i].index != m.lookups[table_index][j].index)
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m.lookups[table_index][++j] = m.lookups[table_index][i];
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else
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{
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m.lookups[table_index][j].mask |= m.lookups[table_index][i].mask;
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m.lookups[table_index][j].auto_zwnj &= m.lookups[table_index][i].auto_zwnj;
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m.lookups[table_index][j].auto_zwj &= m.lookups[table_index][i].auto_zwj;
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}
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m.lookups[table_index].shrink (j + 1);
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}
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last_num_lookups = m.lookups[table_index].len;
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if (stage_index < stages[table_index].len && stages[table_index][stage_index].index == stage) {
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hb_ot_map_t::stage_map_t *stage_map = m.stages[table_index].push ();
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if (likely (stage_map)) {
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stage_map->last_lookup = last_num_lookups;
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stage_map->pause_func = stages[table_index][stage_index].pause_func;
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}
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stage_index++;
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}
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}
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}
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}
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