1 #ifndef OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH 2 #define OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH 3 4 #include "AlternateSet.hh" 5 #include "Common.hh" 6 7 namespace OT { 8 namespace Layout { 9 namespace GSUB_impl { 10 11 template <typename Types> 12 struct AlternateSubstFormat1_2 13 { 14 protected: 15 HBUINT16 format; /* Format identifier--format = 1 */ 16 typename Types::template OffsetTo<Coverage> 17 coverage; /* Offset to Coverage table--from 18 * beginning of Substitution table */ 19 Array16Of<typename Types::template OffsetTo<AlternateSet<Types>>> 20 alternateSet; /* Array of AlternateSet tables 21 * ordered by Coverage Index */ 22 public: 23 DEFINE_SIZE_ARRAY (2 + 2 * Types::size, alternateSet); 24 sanitizeOT::Layout::GSUB_impl::AlternateSubstFormat1_225 bool sanitize (hb_sanitize_context_t *c) const 26 { 27 TRACE_SANITIZE (this); 28 return_trace (coverage.sanitize (c, this) && alternateSet.sanitize (c, this)); 29 } 30 intersectsOT::Layout::GSUB_impl::AlternateSubstFormat1_231 bool intersects (const hb_set_t *glyphs) const 32 { return (this+coverage).intersects (glyphs); } 33 may_have_non_1to1OT::Layout::GSUB_impl::AlternateSubstFormat1_234 bool may_have_non_1to1 () const 35 { return false; } 36 closureOT::Layout::GSUB_impl::AlternateSubstFormat1_237 void closure (hb_closure_context_t *c) const 38 { 39 + hb_zip (this+coverage, alternateSet) 40 | hb_filter (c->parent_active_glyphs (), hb_first) 41 | hb_map (hb_second) 42 | hb_map (hb_add (this)) 43 | hb_apply ([c] (const AlternateSet<Types> &_) { _.closure (c); }) 44 ; 45 } 46 closure_lookupsOT::Layout::GSUB_impl::AlternateSubstFormat1_247 void closure_lookups (hb_closure_lookups_context_t *c) const {} 48 collect_glyphsOT::Layout::GSUB_impl::AlternateSubstFormat1_249 void collect_glyphs (hb_collect_glyphs_context_t *c) const 50 { 51 if (unlikely (!(this+coverage).collect_coverage (c->input))) return; 52 + hb_zip (this+coverage, alternateSet) 53 | hb_map (hb_second) 54 | hb_map (hb_add (this)) 55 | hb_apply ([c] (const AlternateSet<Types> &_) { _.collect_glyphs (c); }) 56 ; 57 } 58 get_coverageOT::Layout::GSUB_impl::AlternateSubstFormat1_259 const Coverage &get_coverage () const { return this+coverage; } 60 would_applyOT::Layout::GSUB_impl::AlternateSubstFormat1_261 bool would_apply (hb_would_apply_context_t *c) const 62 { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; } 63 64 unsigned get_glyph_alternatesOT::Layout::GSUB_impl::AlternateSubstFormat1_265 get_glyph_alternates (hb_codepoint_t gid, 66 unsigned start_offset, 67 unsigned *alternate_count /* IN/OUT. May be NULL. */, 68 hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const 69 { return (this+alternateSet[(this+coverage).get_coverage (gid)]) 70 .get_alternates (start_offset, alternate_count, alternate_glyphs); } 71 applyOT::Layout::GSUB_impl::AlternateSubstFormat1_272 bool apply (hb_ot_apply_context_t *c) const 73 { 74 TRACE_APPLY (this); 75 76 unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); 77 if (likely (index == NOT_COVERED)) return_trace (false); 78 79 return_trace ((this+alternateSet[index]).apply (c)); 80 } 81 serializeOT::Layout::GSUB_impl::AlternateSubstFormat1_282 bool serialize (hb_serialize_context_t *c, 83 hb_sorted_array_t<const HBGlyphID16> glyphs, 84 hb_array_t<const unsigned int> alternate_len_list, 85 hb_array_t<const HBGlyphID16> alternate_glyphs_list) 86 { 87 TRACE_SERIALIZE (this); 88 if (unlikely (!c->extend_min (this))) return_trace (false); 89 if (unlikely (!alternateSet.serialize (c, glyphs.length))) return_trace (false); 90 for (unsigned int i = 0; i < glyphs.length; i++) 91 { 92 unsigned int alternate_len = alternate_len_list[i]; 93 if (unlikely (!alternateSet[i] 94 .serialize_serialize (c, alternate_glyphs_list.sub_array (0, alternate_len)))) 95 return_trace (false); 96 alternate_glyphs_list += alternate_len; 97 } 98 return_trace (coverage.serialize_serialize (c, glyphs)); 99 } 100 subsetOT::Layout::GSUB_impl::AlternateSubstFormat1_2101 bool subset (hb_subset_context_t *c) const 102 { 103 TRACE_SUBSET (this); 104 const hb_set_t &glyphset = *c->plan->glyphset_gsub (); 105 const hb_map_t &glyph_map = *c->plan->glyph_map; 106 107 auto *out = c->serializer->start_embed (*this); 108 if (unlikely (!c->serializer->extend_min (out))) return_trace (false); 109 out->format = format; 110 111 hb_sorted_vector_t<hb_codepoint_t> new_coverage; 112 + hb_zip (this+coverage, alternateSet) 113 | hb_filter (glyphset, hb_first) 114 | hb_filter (subset_offset_array (c, out->alternateSet, this), hb_second) 115 | hb_map (hb_first) 116 | hb_map (glyph_map) 117 | hb_sink (new_coverage) 118 ; 119 out->coverage.serialize_serialize (c->serializer, new_coverage.iter ()); 120 return_trace (bool (new_coverage)); 121 } 122 }; 123 124 } 125 } 126 } 127 128 #endif /* OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH */ 129