summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/OT/Layout/GPOS/SinglePosFormat1.hh
blob: 7cbdf6dc6c715448887e2087598eed2c326479dc (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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
#ifndef OT_LAYOUT_GPOS_SINGLEPOSFORMAT1_HH
#define OT_LAYOUT_GPOS_SINGLEPOSFORMAT1_HH

#include "Common.hh"
#include "ValueFormat.hh"

namespace OT {
namespace Layout {
namespace GPOS_impl {

struct SinglePosFormat1
{
  protected:
  HBUINT16      format;                 /* Format identifier--format = 1 */
  Offset16To<Coverage>
                coverage;               /* Offset to Coverage table--from
                                         * beginning of subtable */
  ValueFormat   valueFormat;            /* Defines the types of data in the
                                         * ValueRecord */
  ValueRecord   values;                 /* Defines positioning
                                         * value(s)--applied to all glyphs in
                                         * the Coverage table */
  public:
  DEFINE_SIZE_ARRAY (6, values);

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this) &&
                  coverage.sanitize (c, this) &&
                  valueFormat.sanitize_value (c, this, values));
  }

  bool intersects (const hb_set_t *glyphs) const
  { return (this+coverage).intersects (glyphs); }

  void closure_lookups (hb_closure_lookups_context_t *c) const {}
  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
  {
    if (!valueFormat.has_device ()) return;

    hb_set_t intersection;
    (this+coverage).intersect_set (*c->glyph_set, intersection);
    if (!intersection) return;

    valueFormat.collect_variation_indices (c, this, values.as_array (valueFormat.get_len ()));
  }

  void collect_glyphs (hb_collect_glyphs_context_t *c) const
  { if (unlikely (!(this+coverage).collect_coverage (c->input))) return; }

  const Coverage &get_coverage () const { return this+coverage; }

  ValueFormat get_value_format () const { return valueFormat; }

  bool apply (hb_ot_apply_context_t *c) const
  {
    TRACE_APPLY (this);
    hb_buffer_t *buffer = c->buffer;
    unsigned int index = (this+coverage).get_coverage  (buffer->cur().codepoint);
    if (likely (index == NOT_COVERED)) return_trace (false);

    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
    {
      c->buffer->message (c->font,
			  "positioning glyph at %d",
			  c->buffer->idx);
    }

    valueFormat.apply_value (c, this, values, buffer->cur_pos());

    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
    {
      c->buffer->message (c->font,
			  "positioned glyph at %d",
			  c->buffer->idx);
    }

    buffer->idx++;
    return_trace (true);
  }

  template<typename Iterator,
      typename SrcLookup,
      hb_requires (hb_is_iterator (Iterator))>
  void serialize (hb_serialize_context_t *c,
                  const SrcLookup *src,
                  Iterator it,
                  ValueFormat newFormat,
                  const hb_map_t *layout_variation_idx_map)
  {
    if (unlikely (!c->extend_min (this))) return;
    if (unlikely (!c->check_assign (valueFormat,
                                    newFormat,
                                    HB_SERIALIZE_ERROR_INT_OVERFLOW))) return;

    for (const hb_array_t<const Value>& _ : + it | hb_map (hb_second))
    {
      src->get_value_format ().copy_values (c, newFormat, src,  &_, layout_variation_idx_map);
      // Only serialize the first entry in the iterator, the rest are assumed to
      // be the same.
      break;
    }

    auto glyphs =
    + it
    | hb_map_retains_sorting (hb_first)
    ;

    coverage.serialize_serialize (c, glyphs);
  }

  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
    const hb_map_t &glyph_map = *c->plan->glyph_map;

    hb_set_t intersection;
    (this+coverage).intersect_set (glyphset, intersection);

    auto it =
    + hb_iter (intersection)
    | hb_map_retains_sorting (glyph_map)
    | hb_zip (hb_repeat (values.as_array (valueFormat.get_len ())))
    ;

    bool ret = bool (it);
    SinglePos_serialize (c->serializer, this, it, c->plan->layout_variation_idx_map);
    return_trace (ret);
  }
};

}
}
}

#endif /* OT_LAYOUT_GPOS_SINGLEPOSFORMAT1_HH */