summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/OT/Layout/GPOS/PairPosFormat1.hh
blob: 35a2db2d45eb54335e9f0c452438c9dc08cb5c91 (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
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
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
#ifndef OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH
#define OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH

namespace OT {
namespace Layout {
namespace GPOS_impl {

struct PairValueRecord
{
  friend struct PairSet;

  int cmp (hb_codepoint_t k) const
  { return secondGlyph.cmp (k); }

  struct context_t
  {
    const void          *base;
    const ValueFormat   *valueFormats;
    const ValueFormat   *newFormats;
    unsigned            len1; /* valueFormats[0].get_len() */
    const hb_map_t      *glyph_map;
    const hb_map_t      *layout_variation_idx_map;
  };

  bool subset (hb_subset_context_t *c,
               context_t *closure) const
  {
    TRACE_SERIALIZE (this);
    auto *s = c->serializer;
    auto *out = s->start_embed (*this);
    if (unlikely (!s->extend_min (out))) return_trace (false);

    out->secondGlyph = (*closure->glyph_map)[secondGlyph];

    closure->valueFormats[0].copy_values (s,
                                          closure->newFormats[0],
                                          closure->base, &values[0],
                                          closure->layout_variation_idx_map);
    closure->valueFormats[1].copy_values (s,
                                          closure->newFormats[1],
                                          closure->base,
                                          &values[closure->len1],
                                          closure->layout_variation_idx_map);

    return_trace (true);
  }

  void collect_variation_indices (hb_collect_variation_indices_context_t *c,
                                  const ValueFormat *valueFormats,
                                  const void *base) const
  {
    unsigned record1_len = valueFormats[0].get_len ();
    unsigned record2_len = valueFormats[1].get_len ();
    const hb_array_t<const Value> values_array = values.as_array (record1_len + record2_len);

    if (valueFormats[0].has_device ())
      valueFormats[0].collect_variation_indices (c, base, values_array.sub_array (0, record1_len));

    if (valueFormats[1].has_device ())
      valueFormats[1].collect_variation_indices (c, base, values_array.sub_array (record1_len, record2_len));
  }

  bool intersects (const hb_set_t& glyphset) const
  {
    return glyphset.has(secondGlyph);
  }

  const Value* get_values_1 () const
  {
    return &values[0];
  }

  const Value* get_values_2 (ValueFormat format1) const
  {
    return &values[format1.get_len ()];
  }

  protected:
  HBGlyphID16   secondGlyph;            /* GlyphID of second glyph in the
                                         * pair--first glyph is listed in the
                                         * Coverage table */
  ValueRecord   values;                 /* Positioning data for the first glyph
                                         * followed by for second glyph */
  public:
  DEFINE_SIZE_ARRAY (2, values);
};

struct PairSet
{
  friend struct PairPosFormat1;

  bool intersects (const hb_set_t *glyphs,
                   const ValueFormat *valueFormats) const
  {
    unsigned int len1 = valueFormats[0].get_len ();
    unsigned int len2 = valueFormats[1].get_len ();
    unsigned int record_size = HBUINT16::static_size * (1 + len1 + len2);

    const PairValueRecord *record = &firstPairValueRecord;
    unsigned int count = len;
    for (unsigned int i = 0; i < count; i++)
    {
      if (glyphs->has (record->secondGlyph))
        return true;
      record = &StructAtOffset<const PairValueRecord> (record, record_size);
    }
    return false;
  }

  void collect_glyphs (hb_collect_glyphs_context_t *c,
                       const ValueFormat *valueFormats) const
  {
    unsigned int len1 = valueFormats[0].get_len ();
    unsigned int len2 = valueFormats[1].get_len ();
    unsigned int record_size = HBUINT16::static_size * (1 + len1 + len2);

    const PairValueRecord *record = &firstPairValueRecord;
    c->input->add_array (&record->secondGlyph, len, record_size);
  }

  void collect_variation_indices (hb_collect_variation_indices_context_t *c,
                                  const ValueFormat *valueFormats) const
  {
    unsigned len1 = valueFormats[0].get_len ();
    unsigned len2 = valueFormats[1].get_len ();
    unsigned record_size = HBUINT16::static_size * (1 + len1 + len2);

    const PairValueRecord *record = &firstPairValueRecord;
    unsigned count = len;
    for (unsigned i = 0; i < count; i++)
    {
      if (c->glyph_set->has (record->secondGlyph))
      { record->collect_variation_indices (c, valueFormats, this); }

      record = &StructAtOffset<const PairValueRecord> (record, record_size);
    }
  }

  bool apply (hb_ot_apply_context_t *c,
              const ValueFormat *valueFormats,
              unsigned int pos) const
  {
    TRACE_APPLY (this);
    hb_buffer_t *buffer = c->buffer;
    unsigned int len1 = valueFormats[0].get_len ();
    unsigned int len2 = valueFormats[1].get_len ();
    unsigned int record_size = HBUINT16::static_size * (1 + len1 + len2);

    const PairValueRecord *record = hb_bsearch (buffer->info[pos].codepoint,
                                                &firstPairValueRecord,
                                                len,
                                                record_size);
    if (record)
    {
      bool applied_first = valueFormats[0].apply_value (c, this, &record->values[0], buffer->cur_pos());
      bool applied_second = valueFormats[1].apply_value (c, this, &record->values[len1], buffer->pos[pos]);
      if (applied_first || applied_second)
        buffer->unsafe_to_break (buffer->idx, pos + 1);
      if (len2)
        pos++;
      buffer->idx = pos;
      return_trace (true);
    }
    buffer->unsafe_to_concat (buffer->idx, pos + 1);
    return_trace (false);
  }

  bool subset (hb_subset_context_t *c,
               const ValueFormat valueFormats[2],
               const ValueFormat newFormats[2]) const
  {
    TRACE_SUBSET (this);
    auto snap = c->serializer->snapshot ();

    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
    out->len = 0;

    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
    const hb_map_t &glyph_map = *c->plan->glyph_map;

    unsigned len1 = valueFormats[0].get_len ();
    unsigned len2 = valueFormats[1].get_len ();
    unsigned record_size = HBUINT16::static_size + Value::static_size * (len1 + len2);

    PairValueRecord::context_t context =
    {
      this,
      valueFormats,
      newFormats,
      len1,
      &glyph_map,
      c->plan->layout_variation_idx_map
    };

    const PairValueRecord *record = &firstPairValueRecord;
    unsigned count = len, num = 0;
    for (unsigned i = 0; i < count; i++)
    {
      if (glyphset.has (record->secondGlyph)
         && record->subset (c, &context)) num++;
      record = &StructAtOffset<const PairValueRecord> (record, record_size);
    }

    out->len = num;
    if (!num) c->serializer->revert (snap);
    return_trace (num);
  }

  struct sanitize_closure_t
  {
    const ValueFormat *valueFormats;
    unsigned int len1; /* valueFormats[0].get_len() */
    unsigned int stride; /* 1 + len1 + len2 */
  };

  bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) const
  {
    TRACE_SANITIZE (this);
    if (!(c->check_struct (this)
       && c->check_range (&firstPairValueRecord,
                          len,
                          HBUINT16::static_size,
                          closure->stride))) return_trace (false);

    unsigned int count = len;
    const PairValueRecord *record = &firstPairValueRecord;
    return_trace (closure->valueFormats[0].sanitize_values_stride_unsafe (c, this, &record->values[0], count, closure->stride) &&
                  closure->valueFormats[1].sanitize_values_stride_unsafe (c, this, &record->values[closure->len1], count, closure->stride));
  }

  protected:
  HBUINT16              len;    /* Number of PairValueRecords */
  PairValueRecord       firstPairValueRecord;
                                /* Array of PairValueRecords--ordered
                                 * by GlyphID of the second glyph */
  public:
  DEFINE_SIZE_MIN (2);
};

struct PairPosFormat1
{
  protected:
  HBUINT16      format;                 /* Format identifier--format = 1 */
  Offset16To<Coverage>
                coverage;               /* Offset to Coverage table--from
                                         * beginning of subtable */
  ValueFormat   valueFormat[2];         /* [0] Defines the types of data in
                                         * ValueRecord1--for the first glyph
                                         * in the pair--may be zero (0) */
                                        /* [1] Defines the types of data in
                                         * ValueRecord2--for the second glyph
                                         * in the pair--may be zero (0) */
  Array16OfOffset16To<PairSet>
                pairSet;                /* Array of PairSet tables
                                         * ordered by Coverage Index */
  public:
  DEFINE_SIZE_ARRAY (10, pairSet);

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);

    if (!c->check_struct (this)) return_trace (false);

    unsigned int len1 = valueFormat[0].get_len ();
    unsigned int len2 = valueFormat[1].get_len ();
    PairSet::sanitize_closure_t closure =
    {
      valueFormat,
      len1,
      1 + len1 + len2
    };

    return_trace (coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
  }


  bool intersects (const hb_set_t *glyphs) const
  {
    return
    + hb_zip (this+coverage, pairSet)
    | hb_filter (*glyphs, hb_first)
    | hb_map (hb_second)
    | hb_map ([glyphs, this] (const Offset16To<PairSet> &_)
              { return (this+_).intersects (glyphs, valueFormat); })
    | hb_any
    ;
  }

  void closure_lookups (hb_closure_lookups_context_t *c) const {}
  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
  {
    if ((!valueFormat[0].has_device ()) && (!valueFormat[1].has_device ())) return;

    auto it =
    + hb_zip (this+coverage, pairSet)
    | hb_filter (c->glyph_set, hb_first)
    | hb_map (hb_second)
    ;

    if (!it) return;
    + it
    | hb_map (hb_add (this))
    | hb_apply ([&] (const PairSet& _) { _.collect_variation_indices (c, valueFormat); })
    ;
  }

  void collect_glyphs (hb_collect_glyphs_context_t *c) const
  {
    if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
    unsigned int count = pairSet.len;
    for (unsigned int i = 0; i < count; i++)
      (this+pairSet[i]).collect_glyphs (c, valueFormat);
  }

  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 (buffer->idx, 1);
    unsigned unsafe_to;
    if (!skippy_iter.next (&unsafe_to))
    {
      buffer->unsafe_to_concat (buffer->idx, unsafe_to);
      return_trace (false);
    }

    return_trace ((this+pairSet[index]).apply (c, valueFormat, skippy_iter.idx));
  }

  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;

    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
    out->format = format;
    out->valueFormat[0] = valueFormat[0];
    out->valueFormat[1] = valueFormat[1];
    if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
    {
      hb_pair_t<unsigned, unsigned> newFormats = compute_effective_value_formats (glyphset);
      out->valueFormat[0] = newFormats.first;
      out->valueFormat[1] = newFormats.second;
    }

    hb_sorted_vector_t<hb_codepoint_t> new_coverage;

    + hb_zip (this+coverage, pairSet)
    | hb_filter (glyphset, hb_first)
    | hb_filter ([this, c, out] (const Offset16To<PairSet>& _)
                 {
                   auto snap = c->serializer->snapshot ();
                   auto *o = out->pairSet.serialize_append (c->serializer);
                   if (unlikely (!o)) return false;
                   bool ret = o->serialize_subset (c, _, this, valueFormat, out->valueFormat);
                   if (!ret)
                   {
                     out->pairSet.pop ();
                     c->serializer->revert (snap);
                   }
                   return ret;
                 },
                 hb_second)
    | hb_map (hb_first)
    | hb_map (glyph_map)
    | hb_sink (new_coverage)
    ;

    out->coverage.serialize_serialize (c->serializer, new_coverage.iter ());

    return_trace (bool (new_coverage));
  }


  hb_pair_t<unsigned, unsigned> compute_effective_value_formats (const hb_set_t& glyphset) const
  {
    unsigned len1 = valueFormat[0].get_len ();
    unsigned len2 = valueFormat[1].get_len ();
    unsigned record_size = HBUINT16::static_size + Value::static_size * (len1 + len2);

    unsigned format1 = 0;
    unsigned format2 = 0;
    for (const Offset16To<PairSet>& _ :
             + hb_zip (this+coverage, pairSet) | hb_filter (glyphset, hb_first) | hb_map (hb_second))
    {
      const PairSet& set = (this + _);
      const PairValueRecord *record = &set.firstPairValueRecord;

      for (unsigned i = 0; i < set.len; i++)
      {
        if (record->intersects (glyphset))
        {
          format1 = format1 | valueFormat[0].get_effective_format (record->get_values_1 ());
          format2 = format2 | valueFormat[1].get_effective_format (record->get_values_2 (valueFormat[0]));
        }
        record = &StructAtOffset<const PairValueRecord> (record, record_size);
      }
    }

    return hb_pair (format1, format2);
  }
};


}
}
}

#endif  // OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH