AlternateSubstFormat1.hh (4808B)
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 25 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 31 bool intersects (const hb_set_t *glyphs) const 32 { return (this+coverage).intersects (glyphs); } 33 34 bool may_have_non_1to1 () const 35 { return false; } 36 37 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 47 void closure_lookups (hb_closure_lookups_context_t *c) const {} 48 49 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 59 const Coverage &get_coverage () const { return this+coverage; } 60 61 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 65 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 72 void 73 collect_glyph_alternates (hb_map_t *alternate_count /* IN/OUT */, 74 hb_map_t *alternate_glyphs /* IN/OUT */) const 75 { 76 + hb_iter (alternateSet) 77 | hb_map (hb_add (this)) 78 | hb_zip (this+coverage) 79 | hb_apply ([&] (const hb_pair_t<const AlternateSet<Types> &, hb_codepoint_t> _) { 80 _.first.collect_alternates (_.second, alternate_count, alternate_glyphs); 81 }) 82 ; 83 } 84 85 bool apply (hb_ot_apply_context_t *c) const 86 { 87 TRACE_APPLY (this); 88 89 unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); 90 if (index == NOT_COVERED) return_trace (false); 91 92 return_trace ((this+alternateSet[index]).apply (c)); 93 } 94 95 bool serialize (hb_serialize_context_t *c, 96 hb_sorted_array_t<const HBGlyphID16> glyphs, 97 hb_array_t<const unsigned int> alternate_len_list, 98 hb_array_t<const HBGlyphID16> alternate_glyphs_list) 99 { 100 TRACE_SERIALIZE (this); 101 if (unlikely (!c->extend_min (this))) return_trace (false); 102 if (unlikely (!alternateSet.serialize (c, glyphs.length))) return_trace (false); 103 for (unsigned int i = 0; i < glyphs.length; i++) 104 { 105 unsigned int alternate_len = alternate_len_list[i]; 106 if (unlikely (!alternateSet[i] 107 .serialize_serialize (c, alternate_glyphs_list.sub_array (0, alternate_len)))) 108 return_trace (false); 109 alternate_glyphs_list += alternate_len; 110 } 111 return_trace (coverage.serialize_serialize (c, glyphs)); 112 } 113 114 bool subset (hb_subset_context_t *c) const 115 { 116 TRACE_SUBSET (this); 117 const hb_set_t &glyphset = *c->plan->glyphset_gsub (); 118 const hb_map_t &glyph_map = *c->plan->glyph_map; 119 120 auto *out = c->serializer->start_embed (*this); 121 if (unlikely (!c->serializer->extend_min (out))) return_trace (false); 122 out->format = format; 123 124 hb_sorted_vector_t<hb_codepoint_t> new_coverage; 125 + hb_zip (this+coverage, alternateSet) 126 | hb_filter (glyphset, hb_first) 127 | hb_filter (subset_offset_array (c, out->alternateSet, this), hb_second) 128 | hb_map (hb_first) 129 | hb_map (glyph_map) 130 | hb_sink (new_coverage) 131 ; 132 out->coverage.serialize_serialize (c->serializer, new_coverage.iter ()); 133 return_trace (bool (new_coverage)); 134 } 135 }; 136 137 } 138 } 139 } 140 141 #endif /* OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH */