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 | HBUINT16 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))) return c->no_dispatch_return_value (); |
27 | TRACE_DISPATCH (this, u.format); |
28 | switch (u.format) { |
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))) return_trace (false); |
46 | unsigned int format = 1; |
47 | u.format = format; |
48 | switch (u.format) { |
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 */ |
63 | |