diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/OT/Layout/GSUB/LigatureSubstFormat1.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/OT/Layout/GSUB/LigatureSubstFormat1.hh | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/Layout/GSUB/LigatureSubstFormat1.hh b/thirdparty/harfbuzz/src/OT/Layout/GSUB/LigatureSubstFormat1.hh new file mode 100644 index 0000000000..19dfe98469 --- /dev/null +++ b/thirdparty/harfbuzz/src/OT/Layout/GSUB/LigatureSubstFormat1.hh @@ -0,0 +1,165 @@ +#ifndef OT_LAYOUT_GSUB_LIGATURESUBSTFORMAT1_HH +#define OT_LAYOUT_GSUB_LIGATURESUBSTFORMAT1_HH + +#include "Common.hh" +#include "LigatureSet.hh" + +namespace OT { +namespace Layout { +namespace GSUB { + +struct LigatureSubstFormat1 +{ + protected: + HBUINT16 format; /* Format identifier--format = 1 */ + Offset16To<Coverage> + coverage; /* Offset to Coverage table--from + * beginning of Substitution table */ + Array16OfOffset16To<LigatureSet> + ligatureSet; /* Array LigatureSet tables + * ordered by Coverage Index */ + public: + DEFINE_SIZE_ARRAY (6, ligatureSet); + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (coverage.sanitize (c, this) && ligatureSet.sanitize (c, this)); + } + + bool intersects (const hb_set_t *glyphs) const + { + return + + hb_zip (this+coverage, ligatureSet) + | hb_filter (*glyphs, hb_first) + | hb_map (hb_second) + | hb_map ([this, glyphs] (const Offset16To<LigatureSet> &_) + { return (this+_).intersects (glyphs); }) + | hb_any + ; + } + + bool may_have_non_1to1 () const + { return true; } + + void closure (hb_closure_context_t *c) const + { + + hb_zip (this+coverage, ligatureSet) + | hb_filter (c->parent_active_glyphs (), hb_first) + | hb_map (hb_second) + | hb_map (hb_add (this)) + | hb_apply ([c] (const LigatureSet &_) { _.closure (c); }) + ; + + } + + void closure_lookups (hb_closure_lookups_context_t *c) const {} + + void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + if (unlikely (!(this+coverage).collect_coverage (c->input))) return; + + + hb_zip (this+coverage, ligatureSet) + | hb_map (hb_second) + | hb_map (hb_add (this)) + | hb_apply ([c] (const LigatureSet &_) { _.collect_glyphs (c); }) + ; + } + + const Coverage &get_coverage () const { return this+coverage; } + + bool would_apply (hb_would_apply_context_t *c) const + { + unsigned int index = (this+coverage).get_coverage (c->glyphs[0]); + if (likely (index == NOT_COVERED)) return false; + + const LigatureSet &lig_set = this+ligatureSet[index]; + return lig_set.would_apply (c); + } + + bool apply (hb_ot_apply_context_t *c) const + { + TRACE_APPLY (this); + + unsigned int index = (this+coverage).get_coverage (c->buffer->cur ().codepoint); + if (likely (index == NOT_COVERED)) return_trace (false); + + const LigatureSet &lig_set = this+ligatureSet[index]; + return_trace (lig_set.apply (c)); + } + + bool serialize (hb_serialize_context_t *c, + hb_sorted_array_t<const HBGlyphID16> first_glyphs, + hb_array_t<const unsigned int> ligature_per_first_glyph_count_list, + hb_array_t<const HBGlyphID16> ligatures_list, + hb_array_t<const unsigned int> component_count_list, + hb_array_t<const HBGlyphID16> component_list /* Starting from second for each ligature */) + { + TRACE_SERIALIZE (this); + if (unlikely (!c->extend_min (this))) return_trace (false); + if (unlikely (!ligatureSet.serialize (c, first_glyphs.length))) return_trace (false); + for (unsigned int i = 0; i < first_glyphs.length; i++) + { + unsigned int ligature_count = ligature_per_first_glyph_count_list[i]; + if (unlikely (!ligatureSet[i] + .serialize_serialize (c, + ligatures_list.sub_array (0, ligature_count), + component_count_list.sub_array (0, ligature_count), + component_list))) return_trace (false); + ligatures_list += ligature_count; + component_count_list += ligature_count; + } + return_trace (coverage.serialize_serialize (c, first_glyphs)); + } + + 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; + + // Due to a bug in some older versions of windows 7 the Coverage table must be + // packed after the LigatureSet and Ligature tables, so serialize Coverage first + // which places it last in the packed order. + hb_set_t new_coverage; + + hb_zip (this+coverage, hb_iter (ligatureSet) | hb_map (hb_add (this))) + | hb_filter (glyphset, hb_first) + | hb_filter ([&] (const LigatureSet& _) { + return _.intersects (&glyphset); + }, hb_second) + | hb_map (hb_first) + | hb_sink (new_coverage); + + if (!c->serializer->push<Coverage> () + ->serialize (c->serializer, + + new_coverage.iter () | hb_map_retains_sorting (glyph_map))) + { + c->serializer->pop_discard (); + return_trace (false); + } + + unsigned coverage_idx = c->serializer->pop_pack (); + c->serializer->add_link (out->coverage, coverage_idx); + + + hb_zip (this+coverage, ligatureSet) + | hb_filter (new_coverage, hb_first) + | hb_map (hb_second) + // to ensure that the repacker always orders the coverage table after the LigatureSet + // and LigatureSubtable's they will be linked to the Coverage table via a virtual link + // the coverage table object idx is passed down to facilitate this. + | hb_apply (subset_offset_array (c, out->ligatureSet, this, coverage_idx)) + ; + + return_trace (bool (new_coverage)); + } +}; + +} +} +} + +#endif /* OT_LAYOUT_GSUB_LIGATURESUBSTFORMAT1_HH */ |