summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-stat-table.hh
blob: 88135234db576a5a9a1ac55df3e7aa7360c4dd46 (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
/*
 * Copyright © 2018  Ebrahim Byagowi
 *
 *  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.
 */

#ifndef HB_OT_STAT_TABLE_HH
#define HB_OT_STAT_TABLE_HH

#include "hb-open-type.hh"
#include "hb-ot-layout-common.hh"

/*
 * STAT -- Style Attributes
 * https://docs.microsoft.com/en-us/typography/opentype/spec/stat
 */
#define HB_OT_TAG_STAT HB_TAG('S','T','A','T')


namespace OT {

enum
{
  OLDER_SIBLING_FONT_ATTRIBUTE = 0x0001,	/* If set, this axis value table
						 * provides axis value information
						 * that is applicable to other fonts
						 * within the same font family. This
						 * is used if the other fonts were
						 * released earlier and did not include
						 * information about values for some axis.
						 * If newer versions of the other
						 * fonts include the information
						 * themselves and are present,
						 * then this record is ignored. */
  ELIDABLE_AXIS_VALUE_NAME = 0x0002		/* If set, it indicates that the axis
						 * value represents the “normal” value
						 * for the axis and may be omitted when
						 * composing name strings. */
  // Reserved = 0xFFFC				/* Reserved for future use — set to zero. */
};

struct AxisValueFormat1
{
  hb_ot_name_id_t get_value_name_id () const { return valueNameID; }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  HBUINT16	format;		/* Format identifier — set to 1. */
  HBUINT16	axisIndex;	/* Zero-base index into the axis record array
				 * identifying the axis of design variation
				 * to which the axis value record applies.
				 * Must be less than designAxisCount. */
  HBUINT16	flags;		/* Flags — see below for details. */
  NameID	valueNameID;	/* The name ID for entries in the 'name' table
				 * that provide a display string for this
				 * attribute value. */
  HBFixed	value;		/* A numeric value for this attribute value. */
  public:
  DEFINE_SIZE_STATIC (12);
};

struct AxisValueFormat2
{
  hb_ot_name_id_t get_value_name_id () const { return valueNameID; }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  HBUINT16	format;		/* Format identifier — set to 2. */
  HBUINT16	axisIndex;	/* Zero-base index into the axis record array
				 * identifying the axis of design variation
				 * to which the axis value record applies.
				 * Must be less than designAxisCount. */
  HBUINT16	flags;		/* Flags — see below for details. */
  NameID	valueNameID;	/* The name ID for entries in the 'name' table
				 * that provide a display string for this
				 * attribute value. */
  HBFixed	nominalValue;	/* A numeric value for this attribute value. */
  HBFixed	rangeMinValue;	/* The minimum value for a range associated
				 * with the specified name ID. */
  HBFixed	rangeMaxValue;	/* The maximum value for a range associated
				 * with the specified name ID. */
  public:
  DEFINE_SIZE_STATIC (20);
};

struct AxisValueFormat3
{
  hb_ot_name_id_t get_value_name_id () const { return valueNameID; }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  HBUINT16	format;		/* Format identifier — set to 3. */
  HBUINT16	axisIndex;	/* Zero-base index into the axis record array
				 * identifying the axis of design variation
				 * to which the axis value record applies.
				 * Must be less than designAxisCount. */
  HBUINT16	flags;		/* Flags — see below for details. */
  NameID	valueNameID;	/* The name ID for entries in the 'name' table
				 * that provide a display string for this
				 * attribute value. */
  HBFixed	value;		/* A numeric value for this attribute value. */
  HBFixed	linkedValue;	/* The numeric value for a style-linked mapping
				 * from this value. */
  public:
  DEFINE_SIZE_STATIC (16);
};

struct AxisValueRecord
{
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  HBUINT16	axisIndex;	/* Zero-base index into the axis record array
				 * identifying the axis to which this value
				 * applies. Must be less than designAxisCount. */
  HBFixed	value;		/* A numeric value for this attribute value. */
  public:
  DEFINE_SIZE_STATIC (6);
};

struct AxisValueFormat4
{
  hb_ot_name_id_t get_value_name_id () const { return valueNameID; }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  HBUINT16	format;		/* Format identifier — set to 4. */
  HBUINT16	axisCount;	/* The total number of axes contributing to
				 * this axis-values combination. */
  HBUINT16	flags;		/* Flags — see below for details. */
  NameID	valueNameID;	/* The name ID for entries in the 'name' table
				 * that provide a display string for this
				 * attribute value. */
  UnsizedArrayOf<AxisValueRecord>
		axisValues;	/* Array of AxisValue records that provide the
				 * combination of axis values, one for each
				 * contributing axis. */
  public:
  DEFINE_SIZE_ARRAY (8, axisValues);
};

struct AxisValue
{
  hb_ot_name_id_t get_value_name_id () const
  {
    switch (u.format)
    {
    case 1: return u.format1.get_value_name_id ();
    case 2: return u.format2.get_value_name_id ();
    case 3: return u.format3.get_value_name_id ();
    case 4: return u.format4.get_value_name_id ();
    default:return HB_OT_NAME_ID_INVALID;
    }
  }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    if (unlikely (!c->check_struct (this)))
      return_trace (false);

    switch (u.format)
    {
    case 1: return_trace (u.format1.sanitize (c));
    case 2: return_trace (u.format2.sanitize (c));
    case 3: return_trace (u.format3.sanitize (c));
    case 4: return_trace (u.format4.sanitize (c));
    default:return_trace (true);
    }
  }

  protected:
  union
  {
  HBUINT16		format;
  AxisValueFormat1	format1;
  AxisValueFormat2	format2;
  AxisValueFormat3	format3;
  AxisValueFormat4	format4;
  } u;
  public:
  DEFINE_SIZE_UNION (2, format);
};

struct StatAxisRecord
{
  hb_ot_name_id_t get_name_id () const { return nameID; }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this)));
  }

  protected:
  Tag		tag;		/* A tag identifying the axis of design variation. */
  NameID	nameID;		/* The name ID for entries in the 'name' table that
				 * provide a display string for this axis. */
  HBUINT16	ordering;	/* A value that applications can use to determine
				 * primary sorting of face names, or for ordering
				 * of descriptors when composing family or face names. */
  public:
  DEFINE_SIZE_STATIC (8);
};

struct STAT
{
  static constexpr hb_tag_t tableTag = HB_OT_TAG_STAT;

  bool has_data () const { return version.to_int (); }

  unsigned get_design_axis_count () const { return designAxisCount; }

  hb_ot_name_id_t get_axis_record_name_id (unsigned axis_record_index) const
  {
    if (unlikely (axis_record_index >= designAxisCount)) return HB_OT_NAME_ID_INVALID;
    const StatAxisRecord &axis_record = get_design_axes ()[axis_record_index];
    return axis_record.get_name_id ();
  }

  unsigned get_axis_value_count () const { return axisValueCount; }

  hb_ot_name_id_t get_axis_value_name_id (unsigned axis_value_index) const
  {
    if (unlikely (axis_value_index >= axisValueCount)) return HB_OT_NAME_ID_INVALID;
    const AxisValue &axis_value = (this + get_axis_value_offsets ()[axis_value_index]);
    return axis_value.get_value_name_id ();
  }

  void collect_name_ids (hb_set_t *nameids_to_retain) const
  {
    if (!has_data ()) return;

    + get_design_axes ()
    | hb_map (&StatAxisRecord::get_name_id)
    | hb_sink (nameids_to_retain)
    ;

    + get_axis_value_offsets ()
    | hb_map (hb_add (&(this + offsetToAxisValueOffsets)))
    | hb_map (&AxisValue::get_value_name_id)
    | hb_sink (nameids_to_retain)
    ;
  }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this) &&
			  version.major == 1 &&
			  version.minor > 0 &&
			  designAxesOffset.sanitize (c, this, designAxisCount) &&
			  offsetToAxisValueOffsets.sanitize (c, this, axisValueCount, &(this+offsetToAxisValueOffsets))));
  }

  protected:
  hb_array_t<const StatAxisRecord> const get_design_axes () const
  { return (this+designAxesOffset).as_array (designAxisCount); }

  hb_array_t<const OffsetTo<AxisValue>> const get_axis_value_offsets () const
  { return (this+offsetToAxisValueOffsets).as_array (axisValueCount); }


  protected:
  FixedVersion<>version;	/* Version of the stat table
				 * initially set to 0x00010002u */
  HBUINT16	designAxisSize;	/* The size in bytes of each axis record. */
  HBUINT16	designAxisCount;/* The number of design axis records. In a
				 * font with an 'fvar' table, this value must be
				 * greater than or equal to the axisCount value
				 * in the 'fvar' table. In all fonts, must
				 * be greater than zero if axisValueCount
				 * is greater than zero. */
  LNNOffsetTo<UnsizedArrayOf<StatAxisRecord>>
		designAxesOffset;
				/* Offset in bytes from the beginning of
				 * the STAT table to the start of the design
				 * axes array. If designAxisCount is zero,
				 * set to zero; if designAxisCount is greater
				 * than zero, must be greater than zero. */
  HBUINT16	axisValueCount;	/* The number of axis value tables. */
  LNNOffsetTo<UnsizedArrayOf<OffsetTo<AxisValue>>>
		offsetToAxisValueOffsets;
				/* Offset in bytes from the beginning of
				 * the STAT table to the start of the design
				 * axes value offsets array. If axisValueCount
				 * is zero, set to zero; if axisValueCount is
				 * greater than zero, must be greater than zero. */
  NameID	elidedFallbackNameID;
				/* Name ID used as fallback when projection of
				 * names into a particular font model produces
				 * a subfamily name containing only elidable
				 * elements. */
  public:
  DEFINE_SIZE_STATIC (20);
};


} /* namespace OT */


#endif /* HB_OT_STAT_TABLE_HH */