diff options
Diffstat (limited to 'gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh')
| -rw-r--r-- | gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh b/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh new file mode 100644 index 0000000000..9faff49909 --- /dev/null +++ b/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh @@ -0,0 +1,207 @@ +#ifndef OT_LAYOUT_GPOS_PAIRSET_HH +#define OT_LAYOUT_GPOS_PAIRSET_HH + +#include "PairValueRecord.hh" + +namespace OT { +namespace Layout { +namespace GPOS_impl { + + +template <typename Types> +struct PairSet +{ + template <typename Types2> + friend struct PairPosFormat1_3; + + using PairValueRecord = GPOS_impl::PairValueRecord<Types>; + + protected: + HBUINT16 len; /* Number of PairValueRecords */ + PairValueRecord firstPairValueRecord; + /* Array of PairValueRecords--ordered + * by GlyphID of the second glyph */ + public: + DEFINE_SIZE_MIN (2); + + static unsigned get_size (unsigned len1, unsigned len2) + { + return Types::HBGlyphID::static_size + Value::static_size * (len1 + len2); + } + static unsigned get_size (const ValueFormat valueFormats[2]) + { + unsigned len1 = valueFormats[0].get_len (); + unsigned len2 = valueFormats[1].get_len (); + return get_size (len1, len2); + } + + struct sanitize_closure_t + { + const ValueFormat *valueFormats; + unsigned int len1; /* valueFormats[0].get_len() */ + unsigned int stride; /* bytes */ + }; + + bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) const + { + TRACE_SANITIZE (this); + if (!(c->check_struct (this) + && c->check_range (&firstPairValueRecord, + len, + closure->stride))) return_trace (false); + + unsigned int count = len; + const PairValueRecord *record = &firstPairValueRecord; + return_trace (closure->valueFormats[0].sanitize_values_stride_unsafe (c, this, &record->values[0], count, closure->stride) && + closure->valueFormats[1].sanitize_values_stride_unsafe (c, this, &record->values[closure->len1], count, closure->stride)); + } + + bool intersects (const hb_set_t *glyphs, + const ValueFormat *valueFormats) const + { + unsigned record_size = get_size (valueFormats); + + const PairValueRecord *record = &firstPairValueRecord; + unsigned int count = len; + for (unsigned int i = 0; i < count; i++) + { + if (glyphs->has (record->secondGlyph)) + return true; + record = &StructAtOffset<const PairValueRecord> (record, record_size); + } + return false; + } + + void collect_glyphs (hb_collect_glyphs_context_t *c, + const ValueFormat *valueFormats) const + { + unsigned record_size = get_size (valueFormats); + + const PairValueRecord *record = &firstPairValueRecord; + c->input->add_array (&record->secondGlyph, len, record_size); + } + + void collect_variation_indices (hb_collect_variation_indices_context_t *c, + const ValueFormat *valueFormats) const + { + unsigned record_size = get_size (valueFormats); + + const PairValueRecord *record = &firstPairValueRecord; + unsigned count = len; + for (unsigned i = 0; i < count; i++) + { + if (c->glyph_set->has (record->secondGlyph)) + { record->collect_variation_indices (c, valueFormats, this); } + + record = &StructAtOffset<const PairValueRecord> (record, record_size); + } + } + + bool apply (hb_ot_apply_context_t *c, + const ValueFormat *valueFormats, + unsigned int pos) const + { + TRACE_APPLY (this); + hb_buffer_t *buffer = c->buffer; + unsigned int len1 = valueFormats[0].get_len (); + unsigned int len2 = valueFormats[1].get_len (); + unsigned record_size = get_size (len1, len2); + + const PairValueRecord *record = hb_bsearch (buffer->info[pos].codepoint, + &firstPairValueRecord, + len, + record_size); + if (record) + { + if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) + { + c->buffer->message (c->font, + "try kerning glyphs at %u,%u", + c->buffer->idx, pos); + } + + bool applied_first = len1 && valueFormats[0].apply_value (c, this, &record->values[0], buffer->cur_pos()); + bool applied_second = len2 && valueFormats[1].apply_value (c, this, &record->values[len1], buffer->pos[pos]); + + if (applied_first || applied_second) + if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) + { + c->buffer->message (c->font, + "kerned glyphs at %u,%u", + c->buffer->idx, pos); + } + + if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) + { + c->buffer->message (c->font, + "tried kerning glyphs at %u,%u", + c->buffer->idx, pos); + } + + if (applied_first || applied_second) + buffer->unsafe_to_break (buffer->idx, pos + 1); + + if (len2) + { + pos++; + // https://github.com/harfbuzz/harfbuzz/issues/3824 + // https://github.com/harfbuzz/harfbuzz/issues/3888#issuecomment-1326781116 + buffer->unsafe_to_break (buffer->idx, pos + 1); + } + + buffer->idx = pos; + return_trace (true); + } + buffer->unsafe_to_concat (buffer->idx, pos + 1); + return_trace (false); + } + + bool subset (hb_subset_context_t *c, + const ValueFormat valueFormats[2], + const ValueFormat newFormats[2]) const + { + TRACE_SUBSET (this); + auto snap = c->serializer->snapshot (); + + auto *out = c->serializer->start_embed (*this); + if (unlikely (!c->serializer->extend_min (out))) return_trace (false); + out->len = 0; + + const hb_set_t &glyphset = *c->plan->glyphset_gsub (); + const hb_map_t &glyph_map = *c->plan->glyph_map; + + unsigned len1 = valueFormats[0].get_len (); + unsigned len2 = valueFormats[1].get_len (); + unsigned record_size = get_size (len1, len2); + + typename PairValueRecord::context_t context = + { + this, + valueFormats, + newFormats, + len1, + &glyph_map, + &c->plan->layout_variation_idx_delta_map + }; + + const PairValueRecord *record = &firstPairValueRecord; + unsigned count = len, num = 0; + for (unsigned i = 0; i < count; i++) + { + if (glyphset.has (record->secondGlyph) + && record->subset (c, &context)) num++; + record = &StructAtOffset<const PairValueRecord> (record, record_size); + } + + out->len = num; + if (!num) c->serializer->revert (snap); + return_trace (num); + } +}; + + +} +} +} + +#endif // OT_LAYOUT_GPOS_PAIRSET_HH |