1 #ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT2_HH 2 #define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT2_HH 3 4 #include "Common.hh" 5 6 namespace OT { 7 namespace Layout { 8 namespace GSUB_impl { 9 10 template <typename Types> 11 struct SingleSubstFormat2_4 12 { 13 protected: 14 HBUINT16 format; /* Format identifier--format = 2 */ 15 typename Types::template OffsetTo<Coverage> 16 coverage; /* Offset to Coverage table--from 17 * beginning of Substitution table */ 18 Array16Of<typename Types::HBGlyphID> 19 substitute; /* Array of substitute 20 * GlyphIDs--ordered by Coverage Index */ 21 22 public: 23 DEFINE_SIZE_ARRAY (4 + Types::size, substitute); 24 sanitizeOT::Layout::GSUB_impl::SingleSubstFormat2_425 bool sanitize (hb_sanitize_context_t *c) const 26 { 27 TRACE_SANITIZE (this); 28 return_trace (coverage.sanitize (c, this) && substitute.sanitize (c)); 29 } 30 intersectsOT::Layout::GSUB_impl::SingleSubstFormat2_431 bool intersects (const hb_set_t *glyphs) const 32 { return (this+coverage).intersects (glyphs); } 33 may_have_non_1to1OT::Layout::GSUB_impl::SingleSubstFormat2_434 bool may_have_non_1to1 () const 35 { return false; } 36 closureOT::Layout::GSUB_impl::SingleSubstFormat2_437 void closure (hb_closure_context_t *c) const 38 { 39 auto &cov = this+coverage; 40 auto &glyph_set = c->parent_active_glyphs (); 41 42 if (substitute.len > glyph_set.get_population () * 4) 43 { 44 for (auto g : glyph_set) 45 { 46 unsigned i = cov.get_coverage (g); 47 if (i == NOT_COVERED || i >= substitute.len) 48 continue; 49 c->output->add (substitute.arrayZ[i]); 50 } 51 52 return; 53 } 54 55 + hb_zip (cov, substitute) 56 | hb_filter (glyph_set, hb_first) 57 | hb_map (hb_second) 58 | hb_sink (c->output) 59 ; 60 } 61 closure_lookupsOT::Layout::GSUB_impl::SingleSubstFormat2_462 void closure_lookups (hb_closure_lookups_context_t *c) const {} 63 collect_glyphsOT::Layout::GSUB_impl::SingleSubstFormat2_464 void collect_glyphs (hb_collect_glyphs_context_t *c) const 65 { 66 if (unlikely (!(this+coverage).collect_coverage (c->input))) return; 67 + hb_zip (this+coverage, substitute) 68 | hb_map (hb_second) 69 | hb_sink (c->output) 70 ; 71 } 72 get_coverageOT::Layout::GSUB_impl::SingleSubstFormat2_473 const Coverage &get_coverage () const { return this+coverage; } 74 would_applyOT::Layout::GSUB_impl::SingleSubstFormat2_475 bool would_apply (hb_would_apply_context_t *c) const 76 { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; } 77 78 unsigned get_glyph_alternatesOT::Layout::GSUB_impl::SingleSubstFormat2_479 get_glyph_alternates (hb_codepoint_t glyph_id, 80 unsigned start_offset, 81 unsigned *alternate_count /* IN/OUT. May be NULL. */, 82 hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const 83 { 84 unsigned int index = (this+coverage).get_coverage (glyph_id); 85 if (likely (index == NOT_COVERED)) 86 { 87 if (alternate_count) 88 *alternate_count = 0; 89 return 0; 90 } 91 92 if (alternate_count && *alternate_count) 93 { 94 glyph_id = substitute[index]; 95 96 *alternate_glyphs = glyph_id; 97 *alternate_count = 1; 98 } 99 100 return 1; 101 } 102 applyOT::Layout::GSUB_impl::SingleSubstFormat2_4103 bool apply (hb_ot_apply_context_t *c) const 104 { 105 TRACE_APPLY (this); 106 unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); 107 if (likely (index == NOT_COVERED)) return_trace (false); 108 109 if (unlikely (index >= substitute.len)) return_trace (false); 110 111 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) 112 { 113 c->buffer->sync_so_far (); 114 c->buffer->message (c->font, 115 "replacing glyph at %u (single substitution)", 116 c->buffer->idx); 117 } 118 119 c->replace_glyph (substitute[index]); 120 121 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) 122 { 123 c->buffer->message (c->font, 124 "replaced glyph at %u (single substitution)", 125 c->buffer->idx - 1u); 126 } 127 128 return_trace (true); 129 } 130 131 template<typename Iterator, 132 hb_requires (hb_is_sorted_source_of (Iterator, 133 hb_codepoint_pair_t))> serializeOT::Layout::GSUB_impl::SingleSubstFormat2_4134 bool serialize (hb_serialize_context_t *c, 135 Iterator it) 136 { 137 TRACE_SERIALIZE (this); 138 auto substitutes = 139 + it 140 | hb_map (hb_second) 141 ; 142 auto glyphs = 143 + it 144 | hb_map_retains_sorting (hb_first) 145 ; 146 if (unlikely (!c->extend_min (this))) return_trace (false); 147 if (unlikely (!substitute.serialize (c, substitutes))) return_trace (false); 148 if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false); 149 return_trace (true); 150 } 151 subsetOT::Layout::GSUB_impl::SingleSubstFormat2_4152 bool subset (hb_subset_context_t *c) const 153 { 154 TRACE_SUBSET (this); 155 const hb_set_t &glyphset = *c->plan->glyphset_gsub (); 156 const hb_map_t &glyph_map = *c->plan->glyph_map; 157 158 auto it = 159 + hb_zip (this+coverage, substitute) 160 | hb_filter (glyphset, hb_first) 161 | hb_filter (glyphset, hb_second) 162 | hb_map_retains_sorting ([&] (hb_pair_t<hb_codepoint_t, const typename Types::HBGlyphID &> p) -> hb_codepoint_pair_t 163 { return hb_pair (glyph_map[p.first], glyph_map[p.second]); }) 164 ; 165 166 bool ret = bool (it); 167 SingleSubst_serialize (c->serializer, it); 168 return_trace (ret); 169 } 170 }; 171 172 } 173 } 174 } 175 176 #endif /* OT_LAYOUT_GSUB_SINGLESUBSTFORMAT2_HH */ 177