summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-name-table.hh
blob: ab07b7196adbf6dfc7811e87bbdea40cb057d5a2 (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
/*
 * Copyright © 2011,2012  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_NAME_TABLE_HH
#define HB_OT_NAME_TABLE_HH

#include "hb-open-type.hh"
#include "hb-ot-name-language.hh"
#include "hb-aat-layout.hh"


namespace OT {


#define entry_score var.u16[0]
#define entry_index var.u16[1]


/*
 * name -- Naming
 * https://docs.microsoft.com/en-us/typography/opentype/spec/name
 */
#define HB_OT_TAG_name HB_TAG('n','a','m','e')

#define UNSUPPORTED	42

struct NameRecord
{
  inline hb_language_t language (hb_face_t *face) const
  {
    unsigned int p = platformID;
    unsigned int l = languageID;

    if (p == 3)
      return _hb_ot_name_language_for_ms_code (l);

    if (p == 1)
      return _hb_ot_name_language_for_mac_code (l);

    if (p == 0)
      return _hb_aat_language_get (face, l);

    return HB_LANGUAGE_INVALID;
  }

  inline uint16_t score (void) const
  {
    /* Same order as in cmap::find_best_subtable(). */
    unsigned int p = platformID;
    unsigned int e = encodingID;

    /* 32-bit. */
    if (p == 3 && e == 10) return 0;
    if (p == 0 && e ==  6) return 1;
    if (p == 0 && e ==  4) return 2;

    /* 16-bit. */
    if (p == 3 && e ==  1) return 3;
    if (p == 0 && e ==  3) return 4;
    if (p == 0 && e ==  2) return 5;
    if (p == 0 && e ==  1) return 6;
    if (p == 0 && e ==  0) return 7;

    /* Symbol. */
    if (p == 3 && e ==  0) return 8;

    /* We treat all Mac Latin names as ASCII only. */
    if (p == 1 && e ==  0) return 10; /* 10 is magic number :| */

    return UNSUPPORTED;
  }

  inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
  {
    TRACE_SANITIZE (this);
    /* We can check from base all the way up to the end of string... */
    return_trace (c->check_struct (this) && c->check_range ((char *) base, (unsigned int) length + offset));
  }

  HBUINT16	platformID;	/* Platform ID. */
  HBUINT16	encodingID;	/* Platform-specific encoding ID. */
  HBUINT16	languageID;	/* Language ID. */
  HBUINT16	nameID;		/* Name ID. */
  HBUINT16	length;		/* String length (in bytes). */
  HBUINT16	offset;		/* String offset from start of storage area (in bytes). */
  public:
  DEFINE_SIZE_STATIC (12);
};

static int
_hb_ot_name_entry_cmp_key (const void *pa, const void *pb)
{
  const hb_ot_name_entry_t *a = (const hb_ot_name_entry_t *) pa;
  const hb_ot_name_entry_t *b = (const hb_ot_name_entry_t *) pb;

  /* Compare by name_id, then language. */

  if (a->name_id != b->name_id)
    return a->name_id < b->name_id ? -1 : +1;

  if (a->language == b->language) return 0;
  if (!a->language) return -1;
  if (!b->language) return +1;
  return strcmp (hb_language_to_string (a->language),
		 hb_language_to_string (b->language));
}

static int
_hb_ot_name_entry_cmp (const void *pa, const void *pb)
{
  /* Compare by name_id, then language, then score, then index. */

  int v = _hb_ot_name_entry_cmp_key (pa, pb);
  if (v)
    return v;

  const hb_ot_name_entry_t *a = (const hb_ot_name_entry_t *) pa;
  const hb_ot_name_entry_t *b = (const hb_ot_name_entry_t *) pb;

  if (a->entry_score != b->entry_score)
    return a->entry_score < b->entry_score ? -1 : +1;

  if (a->entry_index != b->entry_index)
    return a->entry_index < b->entry_index ? -1 : +1;

  return 0;
}

struct name
{
  static const hb_tag_t tableTag	= HB_OT_TAG_name;

  inline unsigned int get_size (void) const
  { return min_size + count * nameRecordZ[0].min_size; }

  inline bool sanitize_records (hb_sanitize_context_t *c) const {
    TRACE_SANITIZE (this);
    const void *string_pool = (this+stringOffset).arrayZ;
    unsigned int _count = count;
    /* Move to run-time?! */
    for (unsigned int i = 0; i < _count; i++)
      if (!nameRecordZ[i].sanitize (c, string_pool)) return_trace (false);
    return_trace (true);
  }

  inline bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this) &&
		  likely (format == 0 || format == 1) &&
		  c->check_array (nameRecordZ.arrayZ, count) &&
		  c->check_range (this, stringOffset));
  }

  struct accelerator_t
  {
    inline void init (hb_face_t *face)
    {
      this->table = hb_sanitize_context_t().reference_table<name> (face);
      assert (this->table.get_length () >= this->table->stringOffset);
      this->pool = (this->table+this->table->stringOffset).arrayZ;
      this->pool_len = this->table.get_length () - this->table->stringOffset;
      const hb_array_t<const NameRecord> all_names (this->table->nameRecordZ.arrayZ,
						    this->table->count);

      this->names.init ();
      this->names.alloc (all_names.len);

      for (uint16_t i = 0; i < all_names.len; i++)
      {
	hb_ot_name_entry_t *entry = this->names.push ();

	entry->name_id = all_names[i].nameID;
	entry->language = all_names[i].language (face);
	entry->entry_score =  all_names[i].score ();
	entry->entry_index = i;
      }

      this->names.qsort (_hb_ot_name_entry_cmp);
      /* Walk and pick best only for each name_id,language pair,
       * while dropping unsupported encodings. */
      unsigned int j = 0;
      for (unsigned int i = 0; i < this->names.len; i++)
      {
        if (this->names[i].entry_score == UNSUPPORTED ||
	    this->names[i].language == HB_LANGUAGE_INVALID)
	  continue;
        if (i &&
	    this->names[i - 1].name_id  == this->names[i].name_id &&
	    this->names[i - 1].language == this->names[i].language)
	  continue;
	this->names[j++] = this->names[i];
      }
      this->names.resize (j);
    }

    inline void fini (void)
    {
      this->names.fini ();
      this->table.destroy ();
    }

    inline int get_index (hb_ot_name_id_t   name_id,
			  hb_language_t     language,
			  unsigned int     *width=nullptr) const
    {
      const hb_ot_name_entry_t key = {name_id, {0}, language};
      const hb_ot_name_entry_t *entry = (const hb_ot_name_entry_t *)
					hb_bsearch (&key,
						    this->names.arrayZ(),
						    this->names.len,
						    sizeof (key),
						    _hb_ot_name_entry_cmp_key);
      if (!entry)
        return -1;

      if (width)
        *width = entry->entry_score < 10 ? 2 : 1;

      return entry->entry_index;
    }

    inline hb_bytes_t get_name (unsigned int idx) const
    {
      const hb_array_t<const NameRecord> all_names (table->nameRecordZ.arrayZ, table->count);
      const NameRecord &record = all_names[idx];
      const hb_array_t<const char> string_pool ((const char *) pool, pool_len);
      return string_pool.sub_array (record.offset, record.length).as_bytes ();
    }

    private:
    const void *pool;
    unsigned int pool_len;
    public:
    hb_blob_ptr_t<name> table;
    hb_vector_t<hb_ot_name_entry_t> names;
  };

  /* We only implement format 0 for now. */
  HBUINT16	format;			/* Format selector (=0/1). */
  HBUINT16	count;			/* Number of name records. */
  OffsetTo<UnsizedArrayOf<HBUINT8>, HBUINT16, false>
		stringOffset;		/* Offset to start of string storage (from start of table). */
  UnsizedArrayOf<NameRecord>
		nameRecordZ;		/* The name records where count is the number of records. */
  public:
  DEFINE_SIZE_ARRAY (6, nameRecordZ);
};

struct name_accelerator_t : name::accelerator_t {};

} /* namespace OT */


#endif /* HB_OT_NAME_TABLE_HH */