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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright © 2017 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_VAR_AVAR_TABLE_HH
#define HB_OT_VAR_AVAR_TABLE_HH
#include "hb-open-type.hh"
#include "hb-ot-var-common.hh"
/*
* avar -- Axis Variations
* https://docs.microsoft.com/en-us/typography/opentype/spec/avar
*/
#define HB_OT_TAG_avar HB_TAG('a','v','a','r')
namespace OT {
/* "Spec": https://github.com/be-fonts/boring-expansion-spec/issues/14 */
struct avarV2Tail
{
friend struct avar;
bool sanitize (hb_sanitize_context_t *c,
const void *base) const
{
TRACE_SANITIZE (this);
return_trace (varIdxMap.sanitize (c, base) &&
varStore.sanitize (c, base));
}
protected:
Offset32To<DeltaSetIndexMap> varIdxMap; /* Offset from the beginning of 'avar' table. */
Offset32To<VariationStore> varStore; /* Offset from the beginning of 'avar' table. */
public:
DEFINE_SIZE_STATIC (8);
};
struct AxisValueMap
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
public:
F2DOT14 coords[2];
// F2DOT14 fromCoord; /* A normalized coordinate value obtained using
// * default normalization. */
// F2DOT14 toCoord; /* The modified, normalized coordinate value. */
public:
DEFINE_SIZE_STATIC (4);
};
struct SegmentMaps : Array16Of<AxisValueMap>
{
int map (int value, unsigned int from_offset = 0, unsigned int to_offset = 1) const
{
#define fromCoord coords[from_offset]
#define toCoord coords[to_offset]
/* The following special-cases are not part of OpenType, which requires
* that at least -1, 0, and +1 must be mapped. But we include these as
* part of a better error recovery scheme. */
if (len < 2)
{
if (!len)
return value;
else /* len == 1*/
return value - arrayZ[0].fromCoord + arrayZ[0].toCoord;
}
if (value <= arrayZ[0].fromCoord)
return value - arrayZ[0].fromCoord + arrayZ[0].toCoord;
unsigned int i;
unsigned int count = len - 1;
for (i = 1; i < count && value > arrayZ[i].fromCoord; i++)
;
if (value >= arrayZ[i].fromCoord)
return value - arrayZ[i].fromCoord + arrayZ[i].toCoord;
if (unlikely (arrayZ[i-1].fromCoord == arrayZ[i].fromCoord))
return arrayZ[i-1].toCoord;
int denom = arrayZ[i].fromCoord - arrayZ[i-1].fromCoord;
return roundf (arrayZ[i-1].toCoord + ((float) (arrayZ[i].toCoord - arrayZ[i-1].toCoord) *
(value - arrayZ[i-1].fromCoord)) / denom);
#undef toCoord
#undef fromCoord
}
int unmap (int value) const { return map (value, 1, 0); }
public:
DEFINE_SIZE_ARRAY (2, *this);
};
struct avar
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_avar;
bool has_data () const { return version.to_int (); }
const SegmentMaps* get_segment_maps () const
{ return &firstAxisSegmentMaps; }
unsigned get_axis_count () const
{ return axisCount; }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!(version.sanitize (c) &&
(version.major == 1
#ifndef HB_NO_VARIATIONS2
|| version.major == 2
#endif
) &&
c->check_struct (this)))
return_trace (false);
const SegmentMaps *map = &firstAxisSegmentMaps;
unsigned int count = axisCount;
for (unsigned int i = 0; i < count; i++)
{
if (unlikely (!map->sanitize (c)))
return_trace (false);
map = &StructAfter<SegmentMaps> (*map);
}
#ifndef HB_NO_VARIATIONS2
if (version.major < 2)
return_trace (true);
const auto &v2 = * (const avarV2Tail *) map;
if (unlikely (!v2.sanitize (c, this)))
return_trace (false);
#endif
return_trace (true);
}
void map_coords (int *coords, unsigned int coords_length) const
{
unsigned int count = hb_min (coords_length, axisCount);
const SegmentMaps *map = &firstAxisSegmentMaps;
for (unsigned int i = 0; i < count; i++)
{
coords[i] = map->map (coords[i]);
map = &StructAfter<SegmentMaps> (*map);
}
#ifndef HB_NO_VARIATIONS2
if (version.major < 2)
return;
for (; count < axisCount; count++)
map = &StructAfter<SegmentMaps> (*map);
const auto &v2 = * (const avarV2Tail *) map;
const auto &varidx_map = this+v2.varIdxMap;
const auto &var_store = this+v2.varStore;
auto *var_store_cache = var_store.create_cache ();
hb_vector_t<int> out;
out.alloc (coords_length);
for (unsigned i = 0; i < coords_length; i++)
{
int v = coords[i];
uint32_t varidx = varidx_map.map (i);
float delta = var_store.get_delta (varidx, coords, coords_length, var_store_cache);
v += roundf (delta);
v = hb_clamp (v, -(1<<14), +(1<<14));
out.push (v);
}
OT::VariationStore::destroy_cache (var_store_cache);
for (unsigned i = 0; i < coords_length; i++)
coords[i] = out[i];
#endif
}
void unmap_coords (int *coords, unsigned int coords_length) const
{
unsigned int count = hb_min (coords_length, axisCount);
const SegmentMaps *map = &firstAxisSegmentMaps;
for (unsigned int i = 0; i < count; i++)
{
coords[i] = map->unmap (coords[i]);
map = &StructAfter<SegmentMaps> (*map);
}
}
protected:
FixedVersion<>version; /* Version of the avar table
* initially set to 0x00010000u */
HBUINT16 reserved; /* This field is permanently reserved. Set to 0. */
HBUINT16 axisCount; /* The number of variation axes in the font. This
* must be the same number as axisCount in the
* 'fvar' table. */
SegmentMaps firstAxisSegmentMaps;
public:
DEFINE_SIZE_MIN (8);
};
} /* namespace OT */
#endif /* HB_OT_VAR_AVAR_TABLE_HH */
|