SinglePosFormat2.hh (7286B)
1 #ifndef OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_HH 2 #define OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_HH 3 4 #include "Common.hh" 5 6 namespace OT { 7 namespace Layout { 8 namespace GPOS_impl { 9 10 struct SinglePosFormat2 : ValueBase 11 { 12 protected: 13 HBUINT16 format; /* Format identifier--format = 2 */ 14 Offset16To<Coverage> 15 coverage; /* Offset to Coverage table--from 16 * beginning of subtable */ 17 ValueFormat valueFormat; /* Defines the types of data in the 18 * ValueRecord */ 19 HBUINT16 valueCount; /* Number of ValueRecords */ 20 ValueRecord values; /* Array of ValueRecords--positioning 21 * values applied to glyphs */ 22 public: 23 DEFINE_SIZE_ARRAY (8, values); 24 25 bool sanitize (hb_sanitize_context_t *c) const 26 { 27 TRACE_SANITIZE (this); 28 return_trace (c->check_struct (this) && 29 coverage.sanitize (c, this) && 30 valueFormat.sanitize_values (c, this, values, valueCount)); 31 } 32 33 bool intersects (const hb_set_t *glyphs) const 34 { return (this+coverage).intersects (glyphs); } 35 36 void closure_lookups (hb_closure_lookups_context_t *c) const {} 37 void collect_variation_indices (hb_collect_variation_indices_context_t *c) const 38 { 39 if (!valueFormat.has_device ()) return; 40 41 auto it = 42 + hb_zip (this+coverage, hb_range ((unsigned) valueCount)) 43 | hb_filter (c->glyph_set, hb_first) 44 ; 45 46 if (!it) return; 47 48 unsigned sub_length = valueFormat.get_len (); 49 const hb_array_t<const Value> values_array = values.as_array (valueCount * sub_length); 50 51 for (unsigned i : + it 52 | hb_map (hb_second)) 53 valueFormat.collect_variation_indices (c, this, values_array.sub_array (i * sub_length, sub_length)); 54 55 } 56 57 void collect_glyphs (hb_collect_glyphs_context_t *c) const 58 { if (unlikely (!(this+coverage).collect_coverage (c->input))) return; } 59 60 const Coverage &get_coverage () const { return this+coverage; } 61 62 ValueFormat get_value_format () const { return valueFormat; } 63 64 bool apply (hb_ot_apply_context_t *c) const 65 { 66 TRACE_APPLY (this); 67 hb_buffer_t *buffer = c->buffer; 68 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint); 69 if (index == NOT_COVERED) return_trace (false); 70 71 if (unlikely (index >= valueCount)) return_trace (false); 72 73 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) 74 { 75 c->buffer->message (c->font, 76 "positioning glyph at %u", 77 c->buffer->idx); 78 } 79 80 valueFormat.apply_value (c, this, 81 &values[index * valueFormat.get_len ()], 82 buffer->cur_pos()); 83 84 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ()) 85 { 86 c->buffer->message (c->font, 87 "positioned glyph at %u", 88 c->buffer->idx); 89 } 90 91 buffer->idx++; 92 return_trace (true); 93 } 94 95 bool 96 position_single (hb_font_t *font, 97 hb_blob_t *table_blob, 98 hb_direction_t direction, 99 hb_codepoint_t gid, 100 hb_glyph_position_t &pos) const 101 { 102 unsigned int index = (this+coverage).get_coverage (gid); 103 if (likely (index == NOT_COVERED)) return false; 104 if (unlikely (index >= valueCount)) return false; 105 106 /* This is ugly... */ 107 hb_buffer_t buffer; 108 buffer.props.direction = direction; 109 OT::hb_ot_apply_context_t c (1, font, &buffer, table_blob); 110 111 valueFormat.apply_value (&c, this, 112 &values[index * valueFormat.get_len ()], 113 pos); 114 return true; 115 } 116 117 118 template<typename Iterator, 119 typename SrcLookup, 120 hb_requires (hb_is_iterator (Iterator))> 121 void serialize (hb_serialize_context_t *c, 122 const SrcLookup *src, 123 Iterator it, 124 ValueFormat newFormat, 125 const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map) 126 { 127 auto out = c->extend_min (this); 128 if (unlikely (!out)) return; 129 if (unlikely (!c->check_assign (valueFormat, newFormat, HB_SERIALIZE_ERROR_INT_OVERFLOW))) return; 130 if (unlikely (!c->check_assign (valueCount, it.len (), HB_SERIALIZE_ERROR_ARRAY_OVERFLOW))) return; 131 132 + it 133 | hb_map (hb_second) 134 | hb_apply ([&] (hb_array_t<const Value> _) 135 { src->get_value_format ().copy_values (c, newFormat, src, &_, layout_variation_idx_delta_map); }) 136 ; 137 138 auto glyphs = 139 + it 140 | hb_map_retains_sorting (hb_first) 141 ; 142 143 coverage.serialize_serialize (c, glyphs); 144 } 145 146 template<typename Iterator, 147 hb_requires (hb_is_iterator (Iterator))> 148 unsigned compute_effective_format (const hb_face_t *face, 149 Iterator it, 150 bool is_instancing, bool strip_hints, 151 bool has_gdef_varstore, 152 const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *varidx_delta_map) const 153 { 154 hb_blob_t* blob = hb_face_reference_table (face, HB_TAG ('f','v','a','r')); 155 bool has_fvar = (blob != hb_blob_get_empty ()); 156 hb_blob_destroy (blob); 157 158 unsigned new_format = 0; 159 if (is_instancing) 160 { 161 new_format = new_format | valueFormat.get_effective_format (+ it | hb_map (hb_second), false, false, this, varidx_delta_map); 162 } 163 /* do not strip hints for VF */ 164 else if (strip_hints) 165 { 166 bool strip = !has_fvar; 167 if (has_fvar && !has_gdef_varstore) 168 strip = true; 169 new_format = new_format | valueFormat.get_effective_format (+ it | hb_map (hb_second), strip, true, this, nullptr); 170 } 171 else 172 new_format = valueFormat; 173 174 return new_format; 175 } 176 177 bool subset (hb_subset_context_t *c) const 178 { 179 TRACE_SUBSET (this); 180 const hb_set_t &glyphset = *c->plan->glyphset_gsub (); 181 const hb_map_t &glyph_map = *c->plan->glyph_map; 182 183 unsigned sub_length = valueFormat.get_len (); 184 auto values_array = values.as_array (valueCount * sub_length); 185 186 auto it = 187 + hb_zip (this+coverage, hb_range ((unsigned) valueCount)) 188 | hb_filter (glyphset, hb_first) 189 | hb_map_retains_sorting ([&] (const hb_pair_t<hb_codepoint_t, unsigned>& _) 190 { 191 return hb_pair (glyph_map[_.first], 192 values_array.sub_array (_.second * sub_length, 193 sub_length)); 194 }) 195 ; 196 197 unsigned new_format = compute_effective_format (c->plan->source, it, 198 bool (c->plan->normalized_coords), 199 bool (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING), 200 c->plan->has_gdef_varstore, 201 &c->plan->layout_variation_idx_delta_map); 202 bool ret = bool (it); 203 SinglePos_serialize (c->serializer, this, it, &c->plan->layout_variation_idx_delta_map, new_format); 204 return_trace (ret); 205 } 206 }; 207 208 209 } 210 } 211 } 212 213 #endif /* OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_HH */