diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh | 148 |
1 files changed, 142 insertions, 6 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh b/src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh index 401d1e1d97..f7649ab76e 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh +++ b/src/3rdparty/harfbuzz-ng/src/hb-ms-feature-ranges.hh @@ -30,6 +30,9 @@ #include "hb.hh" +/* Variations of this code exist in hb-coretext.cc as well + * as hb-aat-map.cc... */ + typedef struct hb_ms_feature_t { uint32_t tag_le; uint32_t value; @@ -52,8 +55,8 @@ struct hb_ms_active_feature_t { a->fea.value < b->fea.value ? -1 : a->fea.value > b->fea.value ? 1 : 0; } - bool operator== (const hb_ms_active_feature_t *f) - { return cmp (this, f) == 0; } + bool operator== (const hb_ms_active_feature_t& f) const + { return cmp (this, &f) == 0; } }; struct hb_ms_feature_event_t { @@ -77,20 +80,153 @@ struct hb_ms_range_record_t { unsigned int index_last; /* == end - 1 */ }; -HB_INTERNAL bool +static inline bool hb_ms_setup_features (const hb_feature_t *features, unsigned int num_features, hb_vector_t<hb_ms_feature_t> &feature_records, /* OUT */ - hb_vector_t<hb_ms_range_record_t> &range_records /* OUT */); + hb_vector_t<hb_ms_range_record_t> &range_records /* OUT */) +{ + feature_records.shrink(0); + range_records.shrink(0); + + /* Sort features by start/end events. */ + hb_vector_t<hb_ms_feature_event_t> feature_events; + for (unsigned int i = 0; i < num_features; i++) + { + hb_ms_active_feature_t feature; + feature.fea.tag_le = hb_uint32_swap (features[i].tag); + feature.fea.value = features[i].value; + feature.order = i; + + hb_ms_feature_event_t *event; + + event = feature_events.push (); + event->index = features[i].start; + event->start = true; + event->feature = feature; + + event = feature_events.push (); + event->index = features[i].end; + event->start = false; + event->feature = feature; + } + feature_events.qsort (); + /* Add a strategic final event. */ + { + hb_ms_active_feature_t feature; + feature.fea.tag_le = 0; + feature.fea.value = 0; + feature.order = num_features + 1; + + auto *event = feature_events.push (); + event->index = 0; /* This value does magic. */ + event->start = false; + event->feature = feature; + } + + /* Scan events and save features for each range. */ + hb_vector_t<hb_ms_active_feature_t> active_features; + unsigned int last_index = 0; + for (unsigned int i = 0; i < feature_events.length; i++) + { + auto *event = &feature_events[i]; + + if (event->index != last_index) + { + /* Save a snapshot of active features and the range. */ + auto *range = range_records.push (); + auto offset = feature_records.length; + active_features.qsort (); + for (unsigned int j = 0; j < active_features.length; j++) + { + if (!j || active_features[j].fea.tag_le != feature_records[feature_records.length - 1].tag_le) + { + feature_records.push (active_features[j].fea); + } + else + { + /* Overrides value for existing feature. */ + feature_records[feature_records.length - 1].value = active_features[j].fea.value; + } + } -HB_INTERNAL void + /* Will convert to pointer after all is ready, since feature_records.array + * may move as we grow it. */ + range->features.features = reinterpret_cast<hb_ms_feature_t *> (offset); + range->features.num_features = feature_records.length - offset; + range->index_first = last_index; + range->index_last = event->index - 1; + + last_index = event->index; + } + + if (event->start) + { + active_features.push (event->feature); + } + else + { + auto *feature = active_features.lsearch (event->feature); + if (feature) + active_features.remove_ordered (feature - active_features.arrayZ); + } + } + + if (!range_records.length) /* No active feature found. */ + num_features = 0; + + /* Fixup the pointers. */ + for (unsigned int i = 0; i < range_records.length; i++) + { + auto *range = &range_records[i]; + range->features.features = (hb_ms_feature_t *) feature_records + reinterpret_cast<uintptr_t> (range->features.features); + } + + return !!num_features; +} + +static inline void hb_ms_make_feature_ranges (hb_vector_t<hb_ms_feature_t> &feature_records, hb_vector_t<hb_ms_range_record_t> &range_records, unsigned int chars_offset, unsigned int chars_len, uint16_t *log_clusters, hb_vector_t<hb_ms_features_t*> &range_features, /* OUT */ - hb_vector_t<uint32_t> &range_counts /* OUT */); + hb_vector_t<uint32_t> &range_counts /* OUT */) +{ + range_features.shrink (0); + range_counts.shrink (0); + + auto *last_range = &range_records[0]; + for (unsigned int i = chars_offset; i < chars_len; i++) + { + auto *range = last_range; + while (log_clusters[i] < range->index_first) + range--; + while (log_clusters[i] > range->index_last) + range++; + if (!range_features.length || + &range->features != range_features[range_features.length - 1]) + { + auto **features = range_features.push (); + auto *c = range_counts.push (); + if (unlikely (!features || !c)) + { + range_features.shrink (0); + range_counts.shrink (0); + break; + } + *features = &range->features; + *c = 1; + } + else + { + range_counts[range_counts.length - 1]++; + } + + last_range = range; + } +} #endif /* HB_MS_FEATURE_RANGES_HH */ |