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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
|
#ifndef OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
#define OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
#include "ValueFormat.hh"
namespace OT {
namespace Layout {
namespace GPOS_impl {
template <typename Types>
struct PairPosFormat2_4
{
protected:
HBUINT16 format; /* Format identifier--format = 2 */
typename Types::template OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat1; /* ValueRecord definition--for the
* first glyph of the pair--may be zero
* (0) */
ValueFormat valueFormat2; /* ValueRecord definition--for the
* second glyph of the pair--may be
* zero (0) */
typename Types::template OffsetTo<ClassDef>
classDef1; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the first glyph of the pair */
typename Types::template OffsetTo<ClassDef>
classDef2; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the second glyph of the pair */
HBUINT16 class1Count; /* Number of classes in ClassDef1
* table--includes Class0 */
HBUINT16 class2Count; /* Number of classes in ClassDef2
* table--includes Class0 */
ValueRecord values; /* Matrix of value pairs:
* class1-major, class2-minor,
* Each entry has value1 and value2 */
public:
DEFINE_SIZE_ARRAY (10 + 3 * Types::size, values);
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!(c->check_struct (this)
&& coverage.sanitize (c, this)
&& classDef1.sanitize (c, this)
&& classDef2.sanitize (c, this))) return_trace (false);
unsigned int len1 = valueFormat1.get_len ();
unsigned int len2 = valueFormat2.get_len ();
unsigned int stride = HBUINT16::static_size * (len1 + len2);
unsigned int count = (unsigned int) class1Count * (unsigned int) class2Count;
return_trace (c->check_range ((const void *) values,
count,
stride) &&
valueFormat1.sanitize_values_stride_unsafe (c, this, &values[0], count, stride) &&
valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
}
bool intersects (const hb_set_t *glyphs) const
{
return (this+coverage).intersects (glyphs) &&
(this+classDef2).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 (!intersects (c->glyph_set)) return;
if ((!valueFormat1.has_device ()) && (!valueFormat2.has_device ())) return;
hb_set_t klass1_glyphs, klass2_glyphs;
if (!(this+classDef1).collect_coverage (&klass1_glyphs)) return;
if (!(this+classDef2).collect_coverage (&klass2_glyphs)) return;
hb_set_t class1_set, class2_set;
for (const unsigned cp : + c->glyph_set->iter () | hb_filter (this + coverage))
{
if (!klass1_glyphs.has (cp)) class1_set.add (0);
else
{
unsigned klass1 = (this+classDef1).get (cp);
class1_set.add (klass1);
}
}
class2_set.add (0);
for (const unsigned cp : + c->glyph_set->iter () | hb_filter (klass2_glyphs))
{
unsigned klass2 = (this+classDef2).get (cp);
class2_set.add (klass2);
}
if (class1_set.is_empty ()
|| class2_set.is_empty ()
|| (class2_set.get_population() == 1 && class2_set.has(0)))
return;
unsigned len1 = valueFormat1.get_len ();
unsigned len2 = valueFormat2.get_len ();
const hb_array_t<const Value> values_array = values.as_array ((unsigned)class1Count * (unsigned) class2Count * (len1 + len2));
for (const unsigned class1_idx : class1_set.iter ())
{
for (const unsigned class2_idx : class2_set.iter ())
{
unsigned start_offset = (class1_idx * (unsigned) class2Count + class2_idx) * (len1 + len2);
if (valueFormat1.has_device ())
valueFormat1.collect_variation_indices (c, this, values_array.sub_array (start_offset, len1));
if (valueFormat2.has_device ())
valueFormat2.collect_variation_indices (c, this, values_array.sub_array (start_offset+len1, len2));
}
}
}
void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
if (unlikely (!(this+classDef2).collect_coverage (c->input))) return;
}
const Coverage &get_coverage () const { return this+coverage; }
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);
hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
skippy_iter.reset_fast (buffer->idx, 1);
unsigned unsafe_to;
if (unlikely (!skippy_iter.next (&unsafe_to)))
{
buffer->unsafe_to_concat (buffer->idx, unsafe_to);
return_trace (false);
}
unsigned int klass2 = (this+classDef2).get_class (buffer->info[skippy_iter.idx].codepoint);
if (!klass2)
{
buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
return_trace (false);
}
unsigned int klass1 = (this+classDef1).get_class (buffer->cur().codepoint);
if (unlikely (klass1 >= class1Count || klass2 >= class2Count))
{
buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
return_trace (false);
}
unsigned int len1 = valueFormat1.get_len ();
unsigned int len2 = valueFormat2.get_len ();
unsigned int record_len = len1 + len2;
const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
bool applied_first = false, applied_second = false;
/* Isolate simple kerning and apply it half to each side.
* Results in better cursor positinoing / underline drawing.
*
* Disabled, because causes issues... :-(
* https://github.com/harfbuzz/harfbuzz/issues/3408
* https://github.com/harfbuzz/harfbuzz/pull/3235#issuecomment-1029814978
*/
#ifndef HB_SPLIT_KERN
if (false)
#endif
{
if (!len2)
{
const hb_direction_t dir = buffer->props.direction;
const bool horizontal = HB_DIRECTION_IS_HORIZONTAL (dir);
const bool backward = HB_DIRECTION_IS_BACKWARD (dir);
unsigned mask = horizontal ? ValueFormat::xAdvance : ValueFormat::yAdvance;
if (backward)
mask |= mask >> 2; /* Add eg. xPlacement in RTL. */
/* Add Devices. */
mask |= mask << 4;
if (valueFormat1 & ~mask)
goto bail;
/* Is simple kern. Apply value on an empty position slot,
* then split it between sides. */
hb_glyph_position_t pos{};
if (valueFormat1.apply_value (c, this, v, pos))
{
hb_position_t *src = &pos.x_advance;
hb_position_t *dst1 = &buffer->cur_pos().x_advance;
hb_position_t *dst2 = &buffer->pos[skippy_iter.idx].x_advance;
unsigned i = horizontal ? 0 : 1;
hb_position_t kern = src[i];
hb_position_t kern1 = kern >> 1;
hb_position_t kern2 = kern - kern1;
if (!backward)
{
dst1[i] += kern1;
dst2[i] += kern2;
dst2[i + 2] += kern2;
}
else
{
dst1[i] += kern1;
dst1[i + 2] += src[i + 2] - kern2;
dst2[i] += kern2;
}
applied_first = applied_second = kern != 0;
goto success;
}
goto boring;
}
}
bail:
if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
{
c->buffer->message (c->font,
"try kerning glyphs at %u,%u",
c->buffer->idx, skippy_iter.idx);
}
applied_first = len1 && valueFormat1.apply_value (c, this, v, buffer->cur_pos());
applied_second = len2 && valueFormat2.apply_value (c, this, v + len1, buffer->pos[skippy_iter.idx]);
if (applied_first || applied_second)
if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
{
c->buffer->message (c->font,
"kerned glyphs at %u,%u",
c->buffer->idx, skippy_iter.idx);
}
if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
{
c->buffer->message (c->font,
"tried kerning glyphs at %u,%u",
c->buffer->idx, skippy_iter.idx);
}
success:
if (applied_first || applied_second)
buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
else
boring:
buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
if (len2)
{
skippy_iter.idx++;
// https://github.com/harfbuzz/harfbuzz/issues/3824
// https://github.com/harfbuzz/harfbuzz/issues/3888#issuecomment-1326781116
buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
}
buffer->idx = skippy_iter.idx;
return_trace (true);
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
out->format = format;
hb_map_t klass1_map;
out->classDef1.serialize_subset (c, classDef1, this, &klass1_map, true, true, &(this + coverage));
out->class1Count = klass1_map.get_population ();
hb_map_t klass2_map;
out->classDef2.serialize_subset (c, classDef2, this, &klass2_map, true, false);
out->class2Count = klass2_map.get_population ();
unsigned len1 = valueFormat1.get_len ();
unsigned len2 = valueFormat2.get_len ();
hb_pair_t<unsigned, unsigned> newFormats = hb_pair (valueFormat1, valueFormat2);
if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
newFormats = compute_effective_value_formats (klass1_map, klass2_map);
out->valueFormat1 = newFormats.first;
out->valueFormat2 = newFormats.second;
if (c->plan->all_axes_pinned)
{
out->valueFormat1 = out->valueFormat1.drop_device_table_flags ();
out->valueFormat2 = out->valueFormat2.drop_device_table_flags ();
}
for (unsigned class1_idx : + hb_range ((unsigned) class1Count) | hb_filter (klass1_map))
{
for (unsigned class2_idx : + hb_range ((unsigned) class2Count) | hb_filter (klass2_map))
{
unsigned idx = (class1_idx * (unsigned) class2Count + class2_idx) * (len1 + len2);
valueFormat1.copy_values (c->serializer, out->valueFormat1, this, &values[idx], &c->plan->layout_variation_idx_delta_map);
valueFormat2.copy_values (c->serializer, out->valueFormat2, this, &values[idx + len1], &c->plan->layout_variation_idx_delta_map);
}
}
const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
const hb_map_t &glyph_map = *c->plan->glyph_map;
auto it =
+ hb_iter (this+coverage)
| hb_filter (glyphset)
| hb_map_retains_sorting (glyph_map)
;
out->coverage.serialize_serialize (c->serializer, it);
return_trace (out->class1Count && out->class2Count && bool (it));
}
hb_pair_t<unsigned, unsigned> compute_effective_value_formats (const hb_map_t& klass1_map,
const hb_map_t& klass2_map) const
{
unsigned len1 = valueFormat1.get_len ();
unsigned len2 = valueFormat2.get_len ();
unsigned record_size = len1 + len2;
unsigned format1 = 0;
unsigned format2 = 0;
for (unsigned class1_idx : + hb_range ((unsigned) class1Count) | hb_filter (klass1_map))
{
for (unsigned class2_idx : + hb_range ((unsigned) class2Count) | hb_filter (klass2_map))
{
unsigned idx = (class1_idx * (unsigned) class2Count + class2_idx) * record_size;
format1 = format1 | valueFormat1.get_effective_format (&values[idx]);
format2 = format2 | valueFormat2.get_effective_format (&values[idx + len1]);
}
if (format1 == valueFormat1 && format2 == valueFormat2)
break;
}
return hb_pair (format1, format2);
}
};
}
}
}
#endif // OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
|