1 #ifndef OT_LAYOUT_GPOS_LIGATUREARRAY_HH 2 #define OT_LAYOUT_GPOS_LIGATUREARRAY_HH 3 4 namespace OT { 5 namespace Layout { 6 namespace GPOS_impl { 7 8 9 typedef AnchorMatrix LigatureAttach; /* component-major-- 10 * in order of writing direction--, 11 * mark-minor-- 12 * ordered by class--zero-based. */ 13 14 /* Array of LigatureAttach tables ordered by LigatureCoverage Index */ 15 struct LigatureArray : List16OfOffset16To<LigatureAttach> 16 { 17 template <typename Iterator, 18 hb_requires (hb_is_iterator (Iterator))> subsetOT::Layout::GPOS_impl::LigatureArray19 bool subset (hb_subset_context_t *c, 20 Iterator coverage, 21 unsigned class_count, 22 const hb_map_t *klass_mapping) const 23 { 24 TRACE_SUBSET (this); 25 const hb_set_t &glyphset = *c->plan->glyphset_gsub (); 26 27 auto *out = c->serializer->start_embed (this); 28 if (unlikely (!c->serializer->extend_min (out))) return_trace (false); 29 30 for (const auto _ : + hb_zip (coverage, *this) 31 | hb_filter (glyphset, hb_first)) 32 { 33 auto *matrix = out->serialize_append (c->serializer); 34 if (unlikely (!matrix)) return_trace (false); 35 36 const LigatureAttach& src = (this + _.second); 37 auto indexes = 38 + hb_range (src.rows * class_count) 39 | hb_filter ([=] (unsigned index) { return klass_mapping->has (index % class_count); }) 40 ; 41 matrix->serialize_subset (c, 42 _.second, 43 this, 44 src.rows, 45 indexes); 46 } 47 return_trace (this->len); 48 } 49 }; 50 51 52 } 53 } 54 } 55 56 #endif /* OT_LAYOUT_GPOS_LIGATUREARRAY_HH */ 57