#ifndef OT_LAYOUT_GPOS_MARKBASEPOSFORMAT1_HH #define OT_LAYOUT_GPOS_MARKBASEPOSFORMAT1_HH #include "MarkArray.hh" namespace OT { namespace Layout { namespace GPOS_impl { typedef AnchorMatrix BaseArray; /* base-major-- * in order of BaseCoverage Index--, * mark-minor-- * ordered by class--zero-based. */ template struct MarkBasePosFormat1_2 { protected: HBUINT16 format; /* Format identifier--format = 1 */ typename Types::template OffsetTo markCoverage; /* Offset to MarkCoverage table--from * beginning of MarkBasePos subtable */ typename Types::template OffsetTo baseCoverage; /* Offset to BaseCoverage table--from * beginning of MarkBasePos subtable */ HBUINT16 classCount; /* Number of classes defined for marks */ typename Types::template OffsetTo markArray; /* Offset to MarkArray table--from * beginning of MarkBasePos subtable */ typename Types::template OffsetTo baseArray; /* Offset to BaseArray table--from * beginning of MarkBasePos subtable */ public: DEFINE_SIZE_STATIC (4 + 4 * Types::size); bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && markCoverage.sanitize (c, this) && baseCoverage.sanitize (c, this) && markArray.sanitize (c, this) && baseArray.sanitize (c, this, (unsigned int) classCount)); } bool intersects (const hb_set_t *glyphs) const { return (this+markCoverage).intersects (glyphs) && (this+baseCoverage).intersects (glyphs); } void closure_lookups (hb_closure_lookups_context_t *c) const {} void collect_variation_indices (hb_collect_variation_indices_context_t *c) const { + hb_zip (this+markCoverage, this+markArray) | hb_filter (c->glyph_set, hb_first) | hb_map (hb_second) | hb_apply ([&] (const MarkRecord& record) { record.collect_variation_indices (c, &(this+markArray)); }) ; hb_map_t klass_mapping; Markclass_closure_and_remap_indexes (this+markCoverage, this+markArray, *c->glyph_set, &klass_mapping); unsigned basecount = (this+baseArray).rows; auto base_iter = + hb_zip (this+baseCoverage, hb_range (basecount)) | hb_filter (c->glyph_set, hb_first) | hb_map (hb_second) ; hb_sorted_vector_t base_indexes; for (const unsigned row : base_iter) { + hb_range ((unsigned) classCount) | hb_filter (klass_mapping) | hb_map ([&] (const unsigned col) { return row * (unsigned) classCount + col; }) | hb_sink (base_indexes) ; } (this+baseArray).collect_variation_indices (c, base_indexes.iter ()); } void collect_glyphs (hb_collect_glyphs_context_t *c) const { if (unlikely (!(this+markCoverage).collect_coverage (c->input))) return; if (unlikely (!(this+baseCoverage).collect_coverage (c->input))) return; } const Coverage &get_coverage () const { return this+markCoverage; } static inline bool accept (hb_buffer_t *buffer, unsigned idx) { /* We only want to attach to the first of a MultipleSubst sequence. * https://github.com/harfbuzz/harfbuzz/issues/740 * Reject others... * ...but stop if we find a mark in the MultipleSubst sequence: * https://github.com/harfbuzz/harfbuzz/issues/1020 */ return !_hb_glyph_info_multiplied (&buffer->info[idx]) || 0 == _hb_glyph_info_get_lig_comp (&buffer->info[idx]) || (idx == 0 || _hb_glyph_info_is_mark (&buffer->info[idx - 1]) || !_hb_glyph_info_multiplied (&buffer->info[idx - 1]) || _hb_glyph_info_get_lig_id (&buffer->info[idx]) != _hb_glyph_info_get_lig_id (&buffer->info[idx - 1]) || _hb_glyph_info_get_lig_comp (&buffer->info[idx]) != _hb_glyph_info_get_lig_comp (&buffer->info[idx - 1]) + 1 ); } bool apply (hb_ot_apply_context_t *c) const { TRACE_APPLY (this); hb_buffer_t *buffer = c->buffer; unsigned int mark_index = (this+markCoverage).get_coverage (buffer->cur().codepoint); if (likely (mark_index == NOT_COVERED)) return_trace (false); /* Now we search backwards for a non-mark glyph. * We don't use skippy_iter.prev() to avoid O(n^2) behavior. */ hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input; skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks); if (c->last_base_until > buffer->idx) { c->last_base_until = 0; c->last_base = -1; } unsigned j; for (j = buffer->idx; j > c->last_base_until; j--) { auto match = skippy_iter.match (buffer->info[j - 1]); if (match == skippy_iter.MATCH) { // https://github.com/harfbuzz/harfbuzz/issues/4124 if (!accept (buffer, j - 1) && NOT_COVERED == (this+baseCoverage).get_coverage (buffer->info[j - 1].codepoint)) match = skippy_iter.SKIP; } if (match == skippy_iter.MATCH) { c->last_base = (signed) j - 1; break; } } c->last_base_until = buffer->idx; if (c->last_base == -1) { buffer->unsafe_to_concat_from_outbuffer (0, buffer->idx + 1); return_trace (false); } unsigned idx = (unsigned) c->last_base; /* Checking that matched glyph is actually a base glyph by GDEF is too strong; disabled */ //if (!_hb_glyph_info_is_base_glyph (&buffer->info[idx])) { return_trace (false); } unsigned int base_index = (this+baseCoverage).get_coverage (buffer->info[idx].codepoint); if (base_index == NOT_COVERED) { buffer->unsafe_to_concat_from_outbuffer (idx, buffer->idx + 1); return_trace (false); } return_trace ((this+markArray).apply (c, mark_index, base_index, this+baseArray, classCount, idx)); } bool subset (hb_subset_context_t *c) const { TRACE_SUBSET (this); const hb_set_t &glyphset = *c->plan->glyphset_gsub (); const hb_map_t &glyph_map = *c->plan->glyph_map; auto *out = c->serializer->start_embed (*this); if (unlikely (!c->serializer->extend_min (out))) return_trace (false); out->format = format; hb_map_t klass_mapping; Markclass_closure_and_remap_indexes (this+markCoverage, this+markArray, glyphset, &klass_mapping); if (!klass_mapping.get_population ()) return_trace (false); out->classCount = klass_mapping.get_population (); auto mark_iter = + hb_zip (this+markCoverage, this+markArray) | hb_filter (glyphset, hb_first) ; hb_sorted_vector_t new_coverage; + mark_iter | hb_map (hb_first) | hb_map (glyph_map) | hb_sink (new_coverage) ; if (!out->markCoverage.serialize_serialize (c->serializer, new_coverage.iter ())) return_trace (false); if (unlikely (!out->markArray.serialize_subset (c, markArray, this, (this+markCoverage).iter (), &klass_mapping))) return_trace (false); unsigned basecount = (this+baseArray).rows; auto base_iter = + hb_zip (this+baseCoverage, hb_range (basecount)) | hb_filter (glyphset, hb_first) ; new_coverage.reset (); + base_iter | hb_map (hb_first) | hb_map (glyph_map) | hb_sink (new_coverage) ; if (!out->baseCoverage.serialize_serialize (c->serializer, new_coverage.iter ())) return_trace (false); hb_sorted_vector_t base_indexes; for (const unsigned row : + base_iter | hb_map (hb_second)) { + hb_range ((unsigned) classCount) | hb_filter (klass_mapping) | hb_map ([&] (const unsigned col) { return row * (unsigned) classCount + col; }) | hb_sink (base_indexes) ; } return_trace (out->baseArray.serialize_subset (c, baseArray, this, base_iter.len (), base_indexes.iter ())); } }; } } } #endif /* OT_LAYOUT_GPOS_MARKBASEPOSFORMAT1_HH */