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comparison: gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh

gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh

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1 /*
2 * Copyright © 2007,2008,2009 Red Hat, Inc.
3 * Copyright © 2010,2011,2012 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29 #ifndef HB_OT_LAYOUT_GDEF_TABLE_HH
30 #define HB_OT_LAYOUT_GDEF_TABLE_HH
31
32 #include "hb-ot-layout-common-private.hh"
33
34 #include "hb-font-private.hh"
35
36
37 namespace OT {
38
39
40 /*
41 * Attachment List Table
42 */
43
44 typedef ArrayOf<USHORT> AttachPoint; /* Array of contour point indices--in
45 * increasing numerical order */
46
47 struct AttachList
48 {
49 inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
50 unsigned int start_offset,
51 unsigned int *point_count /* IN/OUT */,
52 unsigned int *point_array /* OUT */) const
53 {
54 unsigned int index = (this+coverage).get_coverage (glyph_id);
55 if (index == NOT_COVERED)
56 {
57 if (point_count)
58 *point_count = 0;
59 return 0;
60 }
61
62 const AttachPoint &points = this+attachPoint[index];
63
64 if (point_count) {
65 const USHORT *array = points.sub_array (start_offset, point_count);
66 unsigned int count = *point_count;
67 for (unsigned int i = 0; i < count; i++)
68 point_array[i] = array[i];
69 }
70
71 return points.len;
72 }
73
74 inline bool sanitize (hb_sanitize_context_t *c) {
75 TRACE_SANITIZE (this);
76 return TRACE_RETURN (coverage.sanitize (c, this) && attachPoint.sanitize (c, this));
77 }
78
79 protected:
80 OffsetTo<Coverage>
81 coverage; /* Offset to Coverage table -- from
82 * beginning of AttachList table */
83 OffsetArrayOf<AttachPoint>
84 attachPoint; /* Array of AttachPoint tables
85 * in Coverage Index order */
86 public:
87 DEFINE_SIZE_ARRAY (4, attachPoint);
88 };
89
90 /*
91 * Ligature Caret Table
92 */
93
94 struct CaretValueFormat1
95 {
96 friend struct CaretValue;
97
98 private:
99 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const
100 {
101 return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate);
102 }
103
104 inline bool sanitize (hb_sanitize_context_t *c) {
105 TRACE_SANITIZE (this);
106 return TRACE_RETURN (c->check_struct (this));
107 }
108
109 protected:
110 USHORT caretValueFormat; /* Format identifier--format = 1 */
111 SHORT coordinate; /* X or Y value, in design units */
112 public:
113 DEFINE_SIZE_STATIC (4);
114 };
115
116 struct CaretValueFormat2
117 {
118 friend struct CaretValue;
119
120 private:
121 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
122 {
123 hb_position_t x, y;
124 if (font->get_glyph_contour_point_for_origin (glyph_id, caretValuePoint, direction, &x, &y))
125 return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
126 else
127 return 0;
128 }
129
130 inline bool sanitize (hb_sanitize_context_t *c) {
131 TRACE_SANITIZE (this);
132 return TRACE_RETURN (c->check_struct (this));
133 }
134
135 protected:
136 USHORT caretValueFormat; /* Format identifier--format = 2 */
137 USHORT caretValuePoint; /* Contour point index on glyph */
138 public:
139 DEFINE_SIZE_STATIC (4);
140 };
141
142 struct CaretValueFormat3
143 {
144 friend struct CaretValue;
145
146 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const
147 {
148 return HB_DIRECTION_IS_HORIZONTAL (direction) ?
149 font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font) :
150 font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font);
151 }
152
153 inline bool sanitize (hb_sanitize_context_t *c) {
154 TRACE_SANITIZE (this);
155 return TRACE_RETURN (c->check_struct (this) && deviceTable.sanitize (c, this));
156 }
157
158 protected:
159 USHORT caretValueFormat; /* Format identifier--format = 3 */
160 SHORT coordinate; /* X or Y value, in design units */
161 OffsetTo<Device>
162 deviceTable; /* Offset to Device table for X or Y
163 * value--from beginning of CaretValue
164 * table */
165 public:
166 DEFINE_SIZE_STATIC (6);
167 };
168
169 struct CaretValue
170 {
171 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
172 {
173 switch (u.format) {
174 case 1: return u.format1.get_caret_value (font, direction, glyph_id);
175 case 2: return u.format2.get_caret_value (font, direction, glyph_id);
176 case 3: return u.format3.get_caret_value (font, direction, glyph_id);
177 default:return 0;
178 }
179 }
180
181 inline bool sanitize (hb_sanitize_context_t *c) {
182 TRACE_SANITIZE (this);
183 if (!u.format.sanitize (c)) return TRACE_RETURN (false);
184 switch (u.format) {
185 case 1: return TRACE_RETURN (u.format1.sanitize (c));
186 case 2: return TRACE_RETURN (u.format2.sanitize (c));
187 case 3: return TRACE_RETURN (u.format3.sanitize (c));
188 default:return TRACE_RETURN (true);
189 }
190 }
191
192 protected:
193 union {
194 USHORT format; /* Format identifier */
195 CaretValueFormat1 format1;
196 CaretValueFormat2 format2;
197 CaretValueFormat3 format3;
198 } u;
199 public:
200 DEFINE_SIZE_UNION (2, format);
201 };
202
203 struct LigGlyph
204 {
205 inline unsigned int get_lig_carets (hb_font_t *font,
206 hb_direction_t direction,
207 hb_codepoint_t glyph_id,
208 unsigned int start_offset,
209 unsigned int *caret_count /* IN/OUT */,
210 hb_position_t *caret_array /* OUT */) const
211 {
212 if (caret_count) {
213 const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count);
214 unsigned int count = *caret_count;
215 for (unsigned int i = 0; i < count; i++)
216 caret_array[i] = (this+array[i]).get_caret_value (font, direction, glyph_id);
217 }
218
219 return carets.len;
220 }
221
222 inline bool sanitize (hb_sanitize_context_t *c) {
223 TRACE_SANITIZE (this);
224 return TRACE_RETURN (carets.sanitize (c, this));
225 }
226
227 protected:
228 OffsetArrayOf<CaretValue>
229 carets; /* Offset array of CaretValue tables
230 * --from beginning of LigGlyph table
231 * --in increasing coordinate order */
232 public:
233 DEFINE_SIZE_ARRAY (2, carets);
234 };
235
236 struct LigCaretList
237 {
238 inline unsigned int get_lig_carets (hb_font_t *font,
239 hb_direction_t direction,
240 hb_codepoint_t glyph_id,
241 unsigned int start_offset,
242 unsigned int *caret_count /* IN/OUT */,
243 hb_position_t *caret_array /* OUT */) const
244 {
245 unsigned int index = (this+coverage).get_coverage (glyph_id);
246 if (index == NOT_COVERED)
247 {
248 if (caret_count)
249 *caret_count = 0;
250 return 0;
251 }
252 const LigGlyph &lig_glyph = this+ligGlyph[index];
253 return lig_glyph.get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array);
254 }
255
256 inline bool sanitize (hb_sanitize_context_t *c) {
257 TRACE_SANITIZE (this);
258 return TRACE_RETURN (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this));
259 }
260
261 protected:
262 OffsetTo<Coverage>
263 coverage; /* Offset to Coverage table--from
264 * beginning of LigCaretList table */
265 OffsetArrayOf<LigGlyph>
266 ligGlyph; /* Array of LigGlyph tables
267 * in Coverage Index order */
268 public:
269 DEFINE_SIZE_ARRAY (4, ligGlyph);
270 };
271
272
273 struct MarkGlyphSetsFormat1
274 {
275 inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
276 { return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; }
277
278 inline bool sanitize (hb_sanitize_context_t *c) {
279 TRACE_SANITIZE (this);
280 return TRACE_RETURN (coverage.sanitize (c, this));
281 }
282
283 protected:
284 USHORT format; /* Format identifier--format = 1 */
285 LongOffsetArrayOf<Coverage>
286 coverage; /* Array of long offsets to mark set
287 * coverage tables */
288 public:
289 DEFINE_SIZE_ARRAY (4, coverage);
290 };
291
292 struct MarkGlyphSets
293 {
294 inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
295 {
296 switch (u.format) {
297 case 1: return u.format1.covers (set_index, glyph_id);
298 default:return false;
299 }
300 }
301
302 inline bool sanitize (hb_sanitize_context_t *c) {
303 TRACE_SANITIZE (this);
304 if (!u.format.sanitize (c)) return TRACE_RETURN (false);
305 switch (u.format) {
306 case 1: return TRACE_RETURN (u.format1.sanitize (c));
307 default:return TRACE_RETURN (true);
308 }
309 }
310
311 protected:
312 union {
313 USHORT format; /* Format identifier */
314 MarkGlyphSetsFormat1 format1;
315 } u;
316 public:
317 DEFINE_SIZE_UNION (2, format);
318 };
319
320
321 /*
322 * GDEF -- The Glyph Definition Table
323 */
324
325 struct GDEF
326 {
327 static const hb_tag_t tableTag = HB_OT_TAG_GDEF;
328
329 enum GlyphClasses {
330 UnclassifiedGlyph = 0,
331 BaseGlyph = 1,
332 LigatureGlyph = 2,
333 MarkGlyph = 3,
334 ComponentGlyph = 4
335 };
336
337 inline bool has_glyph_classes (void) const { return glyphClassDef != 0; }
338 inline unsigned int get_glyph_class (hb_codepoint_t glyph) const
339 { return (this+glyphClassDef).get_class (glyph); }
340 inline void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const
341 { (this+glyphClassDef).add_class (glyphs, klass); }
342
343 inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; }
344 inline unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const
345 { return (this+markAttachClassDef).get_class (glyph); }
346
347 inline bool has_attach_points (void) const { return attachList != 0; }
348 inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
349 unsigned int start_offset,
350 unsigned int *point_count /* IN/OUT */,
351 unsigned int *point_array /* OUT */) const
352 { return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); }
353
354 inline bool has_lig_carets (void) const { return ligCaretList != 0; }
355 inline unsigned int get_lig_carets (hb_font_t *font,
356 hb_direction_t direction,
357 hb_codepoint_t glyph_id,
358 unsigned int start_offset,
359 unsigned int *caret_count /* IN/OUT */,
360 hb_position_t *caret_array /* OUT */) const
361 { return (this+ligCaretList).get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array); }
362
363 inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002 && markGlyphSetsDef[0] != 0; }
364 inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
365 { return version.to_int () >= 0x00010002 && (this+markGlyphSetsDef[0]).covers (set_index, glyph_id); }
366
367 inline bool sanitize (hb_sanitize_context_t *c) {
368 TRACE_SANITIZE (this);
369 return TRACE_RETURN (version.sanitize (c) &&
370 likely (version.major == 1) &&
371 glyphClassDef.sanitize (c, this) &&
372 attachList.sanitize (c, this) &&
373 ligCaretList.sanitize (c, this) &&
374 markAttachClassDef.sanitize (c, this) &&
375 (version.to_int () < 0x00010002 || markGlyphSetsDef[0].sanitize (c, this)));
376 }
377
378
379 /* glyph_props is a 16-bit integer where the lower 8-bit have bits representing
380 * glyph class and other bits, and high 8-bit gthe mark attachment type (if any).
381 * Not to be confused with lookup_props which is very similar. */
382 inline unsigned int get_glyph_props (hb_codepoint_t glyph) const
383 {
384 unsigned int klass = get_glyph_class (glyph);
385
386 ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs);
387 ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures);
388 ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks);
389
390 switch (klass) {
391 default: return 0;
392 case BaseGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
393 case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
394 case MarkGlyph:
395 klass = get_mark_attachment_type (glyph);
396 return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8);
397 }
398 }
399
400
401 protected:
402 FixedVersion version; /* Version of the GDEF table--currently
403 * 0x00010002 */
404 OffsetTo<ClassDef>
405 glyphClassDef; /* Offset to class definition table
406 * for glyph type--from beginning of
407 * GDEF header (may be Null) */
408 OffsetTo<AttachList>
409 attachList; /* Offset to list of glyphs with
410 * attachment points--from beginning
411 * of GDEF header (may be Null) */
412 OffsetTo<LigCaretList>
413 ligCaretList; /* Offset to list of positioning points
414 * for ligature carets--from beginning
415 * of GDEF header (may be Null) */
416 OffsetTo<ClassDef>
417 markAttachClassDef; /* Offset to class definition table for
418 * mark attachment type--from beginning
419 * of GDEF header (may be Null) */
420 OffsetTo<MarkGlyphSets>
421 markGlyphSetsDef[VAR]; /* Offset to the table of mark set
422 * definitions--from beginning of GDEF
423 * header (may be NULL). Introduced
424 * in version 00010002. */
425 public:
426 DEFINE_SIZE_ARRAY (12, markGlyphSetsDef);
427 };
428
429
430 } /* namespace OT */
431
432
433 #endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */

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