summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-0.9.26/src/hb-ot-map-private.hh
blob: 0e718a6f1f5f7060bd0a2f7a3f4203ec4a985494 (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
/*
 * Copyright © 2009,2010  Red Hat, Inc.
 * Copyright © 2010,2011,2012,2013  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.
 *
 * Red Hat Author(s): Behdad Esfahbod
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_OT_MAP_PRIVATE_HH
#define HB_OT_MAP_PRIVATE_HH

#include "hb-buffer-private.hh"


struct hb_ot_shape_plan_t;

static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};

struct hb_ot_map_t
{
  friend struct hb_ot_map_builder_t;

  public:

  struct feature_map_t {
    hb_tag_t tag; /* should be first for our bsearch to work */
    unsigned int index[2]; /* GSUB/GPOS */
    unsigned int stage[2]; /* GSUB/GPOS */
    unsigned int shift;
    hb_mask_t mask;
    hb_mask_t _1_mask; /* mask for value=1, for quick access */
    unsigned int needs_fallback : 1;
    unsigned int auto_zwj : 1;

    static int cmp (const feature_map_t *a, const feature_map_t *b)
    { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
  };

  struct lookup_map_t {
    unsigned short index;
    unsigned short auto_zwj : 1;
    hb_mask_t mask;

    static int cmp (const lookup_map_t *a, const lookup_map_t *b)
    { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
  };

  typedef void (*pause_func_t) (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer);

  struct stage_map_t {
    unsigned int last_lookup; /* Cumulative */
    pause_func_t pause_func;
  };


  hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); }

  inline hb_mask_t get_global_mask (void) const { return global_mask; }

  inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = NULL) const {
    const feature_map_t *map = features.bsearch (&feature_tag);
    if (shift) *shift = map ? map->shift : 0;
    return map ? map->mask : 0;
  }

  inline bool needs_fallback (hb_tag_t feature_tag) const {
    const feature_map_t *map = features.bsearch (&feature_tag);
    return map ? map->needs_fallback : false;
  }

  inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const {
    const feature_map_t *map = features.bsearch (&feature_tag);
    return map ? map->_1_mask : 0;
  }

  inline unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const {
    const feature_map_t *map = features.bsearch (&feature_tag);
    return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
  }

  inline unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const {
    const feature_map_t *map = features.bsearch (&feature_tag);
    return map ? map->stage[table_index] : (unsigned int) -1;
  }

  inline void get_stage_lookups (unsigned int table_index, unsigned int stage,
				 const struct lookup_map_t **plookups, unsigned int *lookup_count) const {
    if (unlikely (stage == (unsigned int) -1)) {
      *plookups = NULL;
      *lookup_count = 0;
      return;
    }
    assert (stage <= stages[table_index].len);
    unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0;
    unsigned int end   = stage < stages[table_index].len ? stages[table_index][stage].last_lookup : lookups[table_index].len;
    *plookups = &lookups[table_index][start];
    *lookup_count = end - start;
  }

  HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const;
  template <typename Proxy>
  HB_INTERNAL inline void apply (const Proxy &proxy,
				 const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
  HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
  HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;

  inline void finish (void) {
    features.finish ();
    for (unsigned int table_index = 0; table_index < 2; table_index++)
    {
      lookups[table_index].finish ();
      stages[table_index].finish ();
    }
  }

  public:
  hb_tag_t chosen_script[2];
  bool found_script[2];

  private:

  HB_INTERNAL void add_lookups (hb_face_t    *face,
				unsigned int  table_index,
				unsigned int  feature_index,
				hb_mask_t     mask,
				bool          auto_zwj);

  hb_mask_t global_mask;

  hb_prealloced_array_t<feature_map_t, 8> features;
  hb_prealloced_array_t<lookup_map_t, 32> lookups[2]; /* GSUB/GPOS */
  hb_prealloced_array_t<stage_map_t, 4> stages[2]; /* GSUB/GPOS */
};

enum hb_ot_map_feature_flags_t {
  F_NONE		= 0x0000,
  F_GLOBAL		= 0x0001,
  F_HAS_FALLBACK	= 0x0002,
  F_MANUAL_ZWJ		= 0x0004
};
/* Macro version for where const is desired. */
#define F_COMBINE(l,r) (hb_ot_map_feature_flags_t ((unsigned int) (l) | (unsigned int) (r)))
inline hb_ot_map_feature_flags_t
operator | (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r)
{ return hb_ot_map_feature_flags_t ((unsigned int) l | (unsigned int) r); }
inline hb_ot_map_feature_flags_t
operator & (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r)
{ return hb_ot_map_feature_flags_t ((unsigned int) l & (unsigned int) r); }
inline hb_ot_map_feature_flags_t
operator ~ (hb_ot_map_feature_flags_t r)
{ return hb_ot_map_feature_flags_t (~(unsigned int) r); }
inline hb_ot_map_feature_flags_t&
operator |= (hb_ot_map_feature_flags_t &l, hb_ot_map_feature_flags_t r)
{ l = l | r; return l; }
inline hb_ot_map_feature_flags_t&
operator &= (hb_ot_map_feature_flags_t& l, hb_ot_map_feature_flags_t r)
{ l = l & r; return l; }


struct hb_ot_map_builder_t
{
  public:

  HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_,
				   const hb_segment_properties_t *props_);

  HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value,
				hb_ot_map_feature_flags_t flags);

  inline void add_global_bool_feature (hb_tag_t tag)
  { add_feature (tag, 1, F_GLOBAL); }

  inline void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func)
  { add_pause (0, pause_func); }
  inline void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func)
  { add_pause (1, pause_func); }

  HB_INTERNAL void compile (struct hb_ot_map_t &m);

  inline void finish (void) {
    feature_infos.finish ();
    for (unsigned int table_index = 0; table_index < 2; table_index++)
    {
      stages[table_index].finish ();
    }
  }

  private:

  struct feature_info_t {
    hb_tag_t tag;
    unsigned int seq; /* sequence#, used for stable sorting only */
    unsigned int max_value;
    hb_ot_map_feature_flags_t flags;
    unsigned int default_value; /* for non-global features, what should the unset glyphs take */
    unsigned int stage[2]; /* GSUB/GPOS */

    static int cmp (const feature_info_t *a, const feature_info_t *b)
    { return (a->tag != b->tag) ?  (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
  };

  struct stage_info_t {
    unsigned int index;
    hb_ot_map_t::pause_func_t pause_func;
  };

  HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func);

  public:

  hb_face_t *face;
  hb_segment_properties_t props;

  hb_tag_t chosen_script[2];
  bool found_script[2];
  unsigned int script_index[2], language_index[2];

  private:

  unsigned int current_stage[2]; /* GSUB/GPOS */
  hb_prealloced_array_t<feature_info_t, 32> feature_infos;
  hb_prealloced_array_t<stage_info_t, 8> stages[2]; /* GSUB/GPOS */
};



#endif /* HB_OT_MAP_PRIVATE_HH */