diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc')
-rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc | 130 |
1 files changed, 100 insertions, 30 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc b/src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc index 2c38c35029..5bdb8004f2 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc +++ b/src/3rdparty/harfbuzz-ng/src/hb-aat-map.cc @@ -36,27 +36,29 @@ #include "hb-aat-layout-feat-table.hh" -void hb_aat_map_builder_t::add_feature (hb_tag_t tag, unsigned value) +void hb_aat_map_builder_t::add_feature (const hb_feature_t &feature) { if (!face->table.feat->has_data ()) return; - if (tag == HB_TAG ('a','a','l','t')) + if (feature.tag == HB_TAG ('a','a','l','t')) { if (!face->table.feat->exposes_feature (HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES)) return; - feature_info_t *info = features.push(); - info->type = HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES; - info->setting = (hb_aat_layout_feature_selector_t) value; - info->seq = features.length; - info->is_exclusive = true; + feature_range_t *range = features.push(); + range->start = feature.start; + range->end = feature.end; + range->info.type = HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES; + range->info.setting = (hb_aat_layout_feature_selector_t) feature.value; + range->info.seq = features.length; + range->info.is_exclusive = true; return; } - const hb_aat_feature_mapping_t *mapping = hb_aat_layout_find_feature_mapping (tag); + const hb_aat_feature_mapping_t *mapping = hb_aat_layout_find_feature_mapping (feature.tag); if (!mapping) return; - const AAT::FeatureName* feature = &face->table.feat->get_feature (mapping->aatFeatureType); - if (!feature->has_data ()) + const AAT::FeatureName* feature_name = &face->table.feat->get_feature (mapping->aatFeatureType); + if (!feature_name->has_data ()) { /* Special case: Chain::compile_flags will fall back to the deprecated version of * small-caps if necessary, so we need to check for that possibility. @@ -64,38 +66,106 @@ void hb_aat_map_builder_t::add_feature (hb_tag_t tag, unsigned value) if (mapping->aatFeatureType == HB_AAT_LAYOUT_FEATURE_TYPE_LOWER_CASE && mapping->selectorToEnable == HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_SMALL_CAPS) { - feature = &face->table.feat->get_feature (HB_AAT_LAYOUT_FEATURE_TYPE_LETTER_CASE); - if (!feature->has_data ()) return; + feature_name = &face->table.feat->get_feature (HB_AAT_LAYOUT_FEATURE_TYPE_LETTER_CASE); + if (!feature_name->has_data ()) return; } else return; } - feature_info_t *info = features.push(); - info->type = mapping->aatFeatureType; - info->setting = value ? mapping->selectorToEnable : mapping->selectorToDisable; - info->seq = features.length; - info->is_exclusive = feature->is_exclusive (); + feature_range_t *range = features.push(); + range->start = feature.start; + range->end = feature.end; + range->info.type = mapping->aatFeatureType; + range->info.setting = feature.value ? mapping->selectorToEnable : mapping->selectorToDisable; + range->info.seq = features.length; + range->info.is_exclusive = feature_name->is_exclusive (); } void hb_aat_map_builder_t::compile (hb_aat_map_t &m) { - /* Sort features and merge duplicates */ - if (features.length) + /* Compute active features per range, and compile each. */ + + /* Sort features by start/end events. */ + hb_vector_t<feature_event_t> feature_events; + for (unsigned int i = 0; i < features.length; i++) + { + auto &feature = features[i]; + + if (features[i].start == features[i].end) + continue; + + feature_event_t *event; + + event = feature_events.push (); + event->index = features[i].start; + event->start = true; + event->feature = feature.info; + + event = feature_events.push (); + event->index = features[i].end; + event->start = false; + event->feature = feature.info; + } + feature_events.qsort (); + /* Add a strategic final event. */ + { + feature_info_t feature; + feature.seq = features.length + 1; + + feature_event_t *event = feature_events.push (); + event->index = -1; /* This value does magic. */ + event->start = false; + event->feature = feature; + } + + /* Scan events and save features for each range. */ + hb_sorted_vector_t<feature_info_t> active_features; + unsigned int last_index = 0; + for (unsigned int i = 0; i < feature_events.length; i++) { - features.qsort (); - unsigned int j = 0; - for (unsigned int i = 1; i < features.length; i++) - if (features[i].type != features[j].type || - /* Nonexclusive feature selectors come in even/odd pairs to turn a setting on/off - * respectively, so we mask out the low-order bit when checking for "duplicates" - * (selectors referring to the same feature setting) here. */ - (!features[i].is_exclusive && ((features[i].setting & ~1) != (features[j].setting & ~1)))) - features[++j] = features[i]; - features.shrink (j + 1); + feature_event_t *event = &feature_events[i]; + + if (event->index != last_index) + { + /* Save a snapshot of active features and the range. */ + + /* Sort features and merge duplicates */ + current_features = active_features; + range_first = last_index; + range_last = event->index - 1; + if (current_features.length) + { + current_features.qsort (); + unsigned int j = 0; + for (unsigned int i = 1; i < current_features.length; i++) + if (current_features[i].type != current_features[j].type || + /* Nonexclusive feature selectors come in even/odd pairs to turn a setting on/off + * respectively, so we mask out the low-order bit when checking for "duplicates" + * (selectors referring to the same feature setting) here. */ + (!current_features[i].is_exclusive && ((current_features[i].setting & ~1) != (current_features[j].setting & ~1)))) + current_features[++j] = current_features[i]; + current_features.shrink (j + 1); + } + + hb_aat_layout_compile_map (this, &m); + + last_index = event->index; + } + + if (event->start) + { + active_features.push (event->feature); + } else { + feature_info_t *feature = active_features.lsearch (event->feature); + if (feature) + active_features.remove_ordered (feature - active_features.arrayZ); + } } - hb_aat_layout_compile_map (this, &m); + for (auto &chain_flags : m.chain_flags) + // With our above setup this value is one less than desired; adjust it. + chain_flags.tail().cluster_last = HB_FEATURE_GLOBAL_END; } |