summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-var-mvar-table.hh
blob: 20dd2200c50c1153d0c53b28e0969b169b415452 (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
/*
 * 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_MVAR_TABLE_HH
#define HB_OT_VAR_MVAR_TABLE_HH

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


namespace OT {


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

  public:
  Tag		valueTag;	/* Four-byte tag identifying a font-wide measure. */
  HBUINT32		varIdx;		/* Outer/inner index into VariationStore item. */

  public:
  DEFINE_SIZE_STATIC (8);
};


/*
 * MVAR -- Metrics Variations
 * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar
 */
#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')

struct MVAR
{
  static const hb_tag_t tableTag	= HB_OT_TAG_MVAR;

  inline bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (version.sanitize (c) &&
		  likely (version.major == 1) &&
		  c->check_struct (this) &&
		  valueRecordSize >= VariationValueRecord::static_size &&
		  varStore.sanitize (c, this) &&
		  c->check_array (values, valueRecordSize, valueRecordCount));
  }

  inline float get_var (hb_tag_t tag,
			int *coords, unsigned int coord_count) const
  {
    const VariationValueRecord *record;
    record = (VariationValueRecord *) bsearch (&tag, values,
					       valueRecordCount, valueRecordSize,
					       tag_compare);
    if (!record)
      return 0.;

    return (this+varStore).get_delta (record->varIdx, coords, coord_count);
  }

protected:
  static inline int tag_compare (const void *pa, const void *pb)
  {
    const hb_tag_t *a = (const hb_tag_t *) pa;
    const Tag *b = (const Tag *) pb;
    return b->cmp (*a);
  }

  protected:
  FixedVersion<>version;	/* Version of the metrics variation table
				 * initially set to 0x00010000u */
  HBUINT16	reserved;	/* Not used; set to 0. */
  HBUINT16	valueRecordSize;/* The size in bytes of each value record —
				 * must be greater than zero. */
  HBUINT16	valueRecordCount;/* The number of value records — may be zero. */
  OffsetTo<VariationStore>
		varStore;	/* Offset to item variation store table. */
  HBUINT8		values[VAR];	/* Array of value records. The records must be
				 * in binary order of their valueTag field. */

  public:
  DEFINE_SIZE_ARRAY (12, values);
};

} /* namespace OT */


#endif /* HB_OT_VAR_MVAR_TABLE_HH */