summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/OT/Layout/GSUB/AlternateSubst.hh
blob: 04a052a7836ceffe5ab96704523341f203bb3868 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
#ifndef OT_LAYOUT_GSUB_ALTERNATESUBST_HH
#define OT_LAYOUT_GSUB_ALTERNATESUBST_HH

#include "AlternateSubstFormat1.hh"
#include "Common.hh"

namespace OT {
namespace Layout {
namespace GSUB_impl {

struct AlternateSubst
{
  protected:
  union {
  HBUINT16				format;         /* Format identifier */
  AlternateSubstFormat1_2<SmallTypes>	format1;
#ifndef HB_NO_BEYOND_64K
  AlternateSubstFormat1_2<MediumTypes>	format2;
#endif
  } u;
  public:

  template <typename context_t, typename ...Ts>
  typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
  {
    if (unlikely (!c->may_dispatch (this, &u.format))) return c->no_dispatch_return_value ();
    TRACE_DISPATCH (this, u.format);
    switch (u.format) {
    case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
#ifndef HB_NO_BEYOND_64K
    case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
#endif
    default:return_trace (c->default_return_value ());
    }
  }

  /* TODO This function is unused and not updated to 24bit GIDs. Should be done by using
   * iterators. While at it perhaps using iterator of arrays of hb_codepoint_t instead. */
  bool serialize (hb_serialize_context_t *c,
                  hb_sorted_array_t<const HBGlyphID16> glyphs,
                  hb_array_t<const unsigned int> alternate_len_list,
                  hb_array_t<const HBGlyphID16> alternate_glyphs_list)
  {
    TRACE_SERIALIZE (this);
    if (unlikely (!c->extend_min (u.format))) return_trace (false);
    unsigned int format = 1;
    u.format = format;
    switch (u.format) {
    case 1: return_trace (u.format1.serialize (c, glyphs, alternate_len_list, alternate_glyphs_list));
    default:return_trace (false);
    }
  }

  /* TODO subset() should choose format. */

};

}
}
}

#endif  /* OT_LAYOUT_GSUB_ALTERNATESUBST_HH */