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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
#ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
#define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
#include "Common.hh"
namespace OT {
namespace Layout {
namespace GSUB_impl {
template <typename Types>
struct SingleSubstFormat1_3
{
protected:
HBUINT16 format; /* Format identifier--format = 1 */
typename Types::template OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
typename Types::HBUINT
deltaGlyphID; /* Add to original GlyphID to get
* substitute GlyphID, modulo 0x10000 */
public:
DEFINE_SIZE_STATIC (2 + 2 * Types::size);
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c));
}
hb_codepoint_t get_mask () const
{ return (1 << (8 * Types::size)) - 1; }
bool intersects (const hb_set_t *glyphs) const
{ return (this+coverage).intersects (glyphs); }
bool may_have_non_1to1 () const
{ return false; }
void closure (hb_closure_context_t *c) const
{
hb_codepoint_t d = deltaGlyphID;
hb_codepoint_t mask = get_mask ();
/* Help fuzzer avoid this function as much. */
unsigned pop = (this+coverage).get_population ();
if (pop >= mask)
return;
hb_set_t intersection;
(this+coverage).intersect_set (c->parent_active_glyphs (), intersection);
/* In degenerate fuzzer-found fonts, but not real fonts,
* this table can keep adding new glyphs in each round of closure.
* Refuse to close-over, if it maps glyph range to overlapping range. */
hb_codepoint_t min_before = intersection.get_min ();
hb_codepoint_t max_before = intersection.get_max ();
hb_codepoint_t min_after = (min_before + d) & mask;
hb_codepoint_t max_after = (max_before + d) & mask;
if (intersection.get_population () == max_before - min_before + 1 &&
((min_before <= min_after && min_after <= max_before) ||
(min_before <= max_after && max_after <= max_before)))
return;
+ hb_iter (intersection)
| hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
| hb_sink (c->output)
;
}
void closure_lookups (hb_closure_lookups_context_t *c) const {}
void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
hb_codepoint_t d = deltaGlyphID;
hb_codepoint_t mask = get_mask ();
+ hb_iter (this+coverage)
| hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
| hb_sink (c->output)
;
}
const Coverage &get_coverage () const { return this+coverage; }
bool would_apply (hb_would_apply_context_t *c) const
{ return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
bool apply (hb_ot_apply_context_t *c) const
{
TRACE_APPLY (this);
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+coverage).get_coverage (glyph_id);
if (likely (index == NOT_COVERED)) return_trace (false);
hb_codepoint_t d = deltaGlyphID;
hb_codepoint_t mask = get_mask ();
glyph_id = (glyph_id + d) & mask;
if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
{
c->buffer->sync_so_far ();
c->buffer->message (c->font,
"replacing glyph at %d (single substitution)",
c->buffer->idx);
}
c->replace_glyph (glyph_id);
if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
{
c->buffer->message (c->font,
"replaced glyph at %d (single substitution)",
c->buffer->idx - 1);
}
return_trace (true);
}
template<typename Iterator,
hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
bool serialize (hb_serialize_context_t *c,
Iterator glyphs,
unsigned delta)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false);
c->check_assign (deltaGlyphID, delta, HB_SERIALIZE_ERROR_INT_OVERFLOW);
return_trace (true);
}
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_codepoint_t d = deltaGlyphID;
hb_codepoint_t mask = get_mask ();
hb_set_t intersection;
(this+coverage).intersect_set (glyphset, intersection);
auto it =
+ hb_iter (intersection)
| hb_map_retains_sorting ([d, mask] (hb_codepoint_t g) {
return hb_codepoint_pair_t (g,
(g + d) & mask); })
| hb_filter (glyphset, hb_second)
| hb_map_retains_sorting ([&] (hb_codepoint_pair_t p) -> hb_codepoint_pair_t
{ return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
;
bool ret = bool (it);
SingleSubst_serialize (c->serializer, it);
return_trace (ret);
}
};
}
}
}
#endif /* OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH */
|