1#ifndef OT_LAYOUT_GSUB_ALTERNATESUBST_HH
2#define OT_LAYOUT_GSUB_ALTERNATESUBST_HH
3
4#include "AlternateSubstFormat1.hh"
5#include "Common.hh"
6
7namespace OT {
8namespace Layout {
9namespace GSUB_impl {
10
11struct 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