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