AlternateSubst.hh (1857B)
1 #ifndef OT_LAYOUT_GSUB_ALTERNATESUBST_HH 2 #define OT_LAYOUT_GSUB_ALTERNATESUBST_HH 3 4 #include "AlternateSubstFormat1.hh" 5 #include "Common.hh" 6 7 namespace OT { 8 namespace Layout { 9 namespace GSUB_impl { 10 11 struct AlternateSubst 12 { 13 protected: 14 union { 15 struct { HBUINT16 v; } format; /* Format identifier */ 16 AlternateSubstFormat1_2<SmallTypes> format1; 17 #ifndef HB_NO_BEYOND_64K 18 AlternateSubstFormat1_2<MediumTypes> format2; 19 #endif 20 } u; 21 public: 22 23 template <typename context_t, typename ...Ts> 24 typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const 25 { 26 if (unlikely (!c->may_dispatch (this, &u.format.v))) return c->no_dispatch_return_value (); 27 TRACE_DISPATCH (this, u.format.v); 28 switch (u.format.v) { 29 case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...)); 30 #ifndef HB_NO_BEYOND_64K 31 case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...)); 32 #endif 33 default:return_trace (c->default_return_value ()); 34 } 35 } 36 37 /* TODO This function is unused and not updated to 24bit GIDs. Should be done by using 38 * iterators. While at it perhaps using iterator of arrays of hb_codepoint_t instead. */ 39 bool serialize (hb_serialize_context_t *c, 40 hb_sorted_array_t<const HBGlyphID16> glyphs, 41 hb_array_t<const unsigned int> alternate_len_list, 42 hb_array_t<const HBGlyphID16> alternate_glyphs_list) 43 { 44 TRACE_SERIALIZE (this); 45 if (unlikely (!c->extend_min (u.format.v))) return_trace (false); 46 unsigned int format = 1; 47 u.format.v = format; 48 switch (u.format.v) { 49 case 1: return_trace (u.format1.serialize (c, glyphs, alternate_len_list, alternate_glyphs_list)); 50 default:return_trace (false); 51 } 52 } 53 54 /* TODO subset() should choose format. */ 55 56 }; 57 58 } 59 } 60 } 61 62 #endif /* OT_LAYOUT_GSUB_ALTERNATESUBST_HH */