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<UINT16> 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 UINT16 *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) const 75 { 76 TRACE_SANITIZE (this); 77 return_trace (coverage.sanitize (c, this) && attachPoint.sanitize (c, this)); 78 } 79 80 protected: 81 OffsetTo<Coverage> 82 coverage; /* Offset to Coverage table -- from 83 * beginning of AttachList table */ 84 OffsetArrayOf<AttachPoint> 85 attachPoint; /* Array of AttachPoint tables 86 * in Coverage Index order */ 87 public: 88 DEFINE_SIZE_ARRAY (4, attachPoint); 89 }; 90 91 /* 92 * Ligature Caret Table 93 */ 94 95 struct CaretValueFormat1 96 { 97 friend struct CaretValue; 98 99 private: 100 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction) const 101 { 102 return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate); 103 } 104 105 inline bool sanitize (hb_sanitize_context_t *c) const 106 { 107 TRACE_SANITIZE (this); 108 return_trace (c->check_struct (this)); 109 } 110 111 protected: 112 UINT16 caretValueFormat; /* Format identifier--format = 1 */ 113 INT16 coordinate; /* X or Y value, in design units */ 114 public: 115 DEFINE_SIZE_STATIC (4); 116 }; 117 118 struct CaretValueFormat2 119 { 120 friend struct CaretValue; 121 122 private: 123 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const 124 { 125 hb_position_t x, y; 126 if (font->get_glyph_contour_point_for_origin (glyph_id, caretValuePoint, direction, &x, &y)) 127 return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y; 128 else 129 return 0; 130 } 131 132 inline bool sanitize (hb_sanitize_context_t *c) const 133 { 134 TRACE_SANITIZE (this); 135 return_trace (c->check_struct (this)); 136 } 137 138 protected: 139 UINT16 caretValueFormat; /* Format identifier--format = 2 */ 140 UINT16 caretValuePoint; /* Contour point index on glyph */ 141 public: 142 DEFINE_SIZE_STATIC (4); 143 }; 144 145 struct CaretValueFormat3 146 { 147 friend struct CaretValue; 148 149 inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, const VariationStore &var_store) const 150 { 151 return HB_DIRECTION_IS_HORIZONTAL (direction) ? 152 font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) : 153 font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store); 154 } 155 156 inline bool sanitize (hb_sanitize_context_t *c) const 157 { 158 TRACE_SANITIZE (this); 159 return_trace (c->check_struct (this) && deviceTable.sanitize (c, this)); 160 } 161 162 protected: 163 UINT16 caretValueFormat; /* Format identifier--format = 3 */ 164 INT16 coordinate; /* X or Y value, in design units */ 165 OffsetTo<Device> 166 deviceTable; /* Offset to Device table for X or Y 167 * value--from beginning of CaretValue 168 * table */ 169 public: 170 DEFINE_SIZE_STATIC (6); 171 }; 172 173 struct CaretValue 174 { 175 inline hb_position_t get_caret_value (hb_font_t *font, 176 hb_direction_t direction, 177 hb_codepoint_t glyph_id, 178 const VariationStore &var_store) const 179 { 180 switch (u.format) { 181 case 1: return u.format1.get_caret_value (font, direction); 182 case 2: return u.format2.get_caret_value (font, direction, glyph_id); 183 case 3: return u.format3.get_caret_value (font, direction, var_store); 184 default:return 0; 185 } 186 } 187 188 inline bool sanitize (hb_sanitize_context_t *c) const 189 { 190 TRACE_SANITIZE (this); 191 if (!u.format.sanitize (c)) return_trace (false); 192 switch (u.format) { 193 case 1: return_trace (u.format1.sanitize (c)); 194 case 2: return_trace (u.format2.sanitize (c)); 195 case 3: return_trace (u.format3.sanitize (c)); 196 default:return_trace (true); 197 } 198 } 199 200 protected: 201 union { 202 UINT16 format; /* Format identifier */ 203 CaretValueFormat1 format1; 204 CaretValueFormat2 format2; 205 CaretValueFormat3 format3; 206 } u; 207 public: 208 DEFINE_SIZE_UNION (2, format); 209 }; 210 211 struct LigGlyph 212 { 213 inline unsigned int get_lig_carets (hb_font_t *font, 214 hb_direction_t direction, 215 hb_codepoint_t glyph_id, 216 const VariationStore &var_store, 217 unsigned int start_offset, 218 unsigned int *caret_count /* IN/OUT */, 219 hb_position_t *caret_array /* OUT */) const 220 { 221 if (caret_count) { 222 const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count); 223 unsigned int count = *caret_count; 224 for (unsigned int i = 0; i < count; i++) 225 caret_array[i] = (this+array[i]).get_caret_value (font, direction, glyph_id, var_store); 226 } 227 228 return carets.len; 229 } 230 231 inline bool sanitize (hb_sanitize_context_t *c) const 232 { 233 TRACE_SANITIZE (this); 234 return_trace (carets.sanitize (c, this)); 235 } 236 237 protected: 238 OffsetArrayOf<CaretValue> 239 carets; /* Offset array of CaretValue tables 240 * --from beginning of LigGlyph table 241 * --in increasing coordinate order */ 242 public: 243 DEFINE_SIZE_ARRAY (2, carets); 244 }; 245 246 struct LigCaretList 247 { 248 inline unsigned int get_lig_carets (hb_font_t *font, 249 hb_direction_t direction, 250 hb_codepoint_t glyph_id, 251 const VariationStore &var_store, 252 unsigned int start_offset, 253 unsigned int *caret_count /* IN/OUT */, 254 hb_position_t *caret_array /* OUT */) const 255 { 256 unsigned int index = (this+coverage).get_coverage (glyph_id); 257 if (index == NOT_COVERED) 258 { 259 if (caret_count) 260 *caret_count = 0; 261 return 0; 262 } 263 const LigGlyph &lig_glyph = this+ligGlyph[index]; 264 return lig_glyph.get_lig_carets (font, direction, glyph_id, var_store, start_offset, caret_count, caret_array); 265 } 266 267 inline bool sanitize (hb_sanitize_context_t *c) const 268 { 269 TRACE_SANITIZE (this); 270 return_trace (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this)); 271 } 272 273 protected: 274 OffsetTo<Coverage> 275 coverage; /* Offset to Coverage table--from 276 * beginning of LigCaretList table */ 277 OffsetArrayOf<LigGlyph> 278 ligGlyph; /* Array of LigGlyph tables 279 * in Coverage Index order */ 280 public: 281 DEFINE_SIZE_ARRAY (4, ligGlyph); 282 }; 283 284 285 struct MarkGlyphSetsFormat1 286 { 287 inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const 288 { return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; } 289 290 inline bool sanitize (hb_sanitize_context_t *c) const 291 { 292 TRACE_SANITIZE (this); 293 return_trace (coverage.sanitize (c, this)); 294 } 295 296 protected: 297 UINT16 format; /* Format identifier--format = 1 */ 298 ArrayOf<LOffsetTo<Coverage> > 299 coverage; /* Array of long offsets to mark set 300 * coverage tables */ 301 public: 302 DEFINE_SIZE_ARRAY (4, coverage); 303 }; 304 305 struct MarkGlyphSets 306 { 307 inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const 308 { 309 switch (u.format) { 310 case 1: return u.format1.covers (set_index, glyph_id); 311 default:return false; 312 } 313 } 314 315 inline bool sanitize (hb_sanitize_context_t *c) const 316 { 317 TRACE_SANITIZE (this); 318 if (!u.format.sanitize (c)) return_trace (false); 319 switch (u.format) { 320 case 1: return_trace (u.format1.sanitize (c)); 321 default:return_trace (true); 322 } 323 } 324 325 protected: 326 union { 327 UINT16 format; /* Format identifier */ 328 MarkGlyphSetsFormat1 format1; 329 } u; 330 public: 331 DEFINE_SIZE_UNION (2, format); 332 }; 333 334 335 /* 336 * GDEF -- The Glyph Definition Table 337 */ 338 339 struct GDEF 340 { 341 static const hb_tag_t tableTag = HB_OT_TAG_GDEF; 342 343 enum GlyphClasses { 344 UnclassifiedGlyph = 0, 345 BaseGlyph = 1, 346 LigatureGlyph = 2, 347 MarkGlyph = 3, 348 ComponentGlyph = 4 349 }; 350 351 inline bool has_glyph_classes (void) const { return glyphClassDef != 0; } 352 inline unsigned int get_glyph_class (hb_codepoint_t glyph) const 353 { return (this+glyphClassDef).get_class (glyph); } 354 inline void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const 355 { (this+glyphClassDef).add_class (glyphs, klass); } 356 357 inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; } 358 inline unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const 359 { return (this+markAttachClassDef).get_class (glyph); } 360 361 inline bool has_attach_points (void) const { return attachList != 0; } 362 inline unsigned int get_attach_points (hb_codepoint_t glyph_id, 363 unsigned int start_offset, 364 unsigned int *point_count /* IN/OUT */, 365 unsigned int *point_array /* OUT */) const 366 { return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); } 367 368 inline bool has_lig_carets (void) const { return ligCaretList != 0; } 369 inline unsigned int get_lig_carets (hb_font_t *font, 370 hb_direction_t direction, 371 hb_codepoint_t glyph_id, 372 unsigned int start_offset, 373 unsigned int *caret_count /* IN/OUT */, 374 hb_position_t *caret_array /* OUT */) const 375 { return (this+ligCaretList).get_lig_carets (font, 376 direction, glyph_id, get_var_store(), 377 start_offset, caret_count, caret_array); } 378 379 inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; } 380 inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const 381 { return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); } 382 383 inline bool has_var_store (void) const { return version.to_int () >= 0x00010003u && varStore != 0; } 384 inline const VariationStore &get_var_store (void) const 385 { return version.to_int () >= 0x00010003u ? this+varStore : Null(VariationStore); } 386 387 inline bool sanitize (hb_sanitize_context_t *c) const 388 { 389 TRACE_SANITIZE (this); 390 return_trace (version.sanitize (c) && 391 likely (version.major == 1) && 392 glyphClassDef.sanitize (c, this) && 393 attachList.sanitize (c, this) && 394 ligCaretList.sanitize (c, this) && 395 markAttachClassDef.sanitize (c, this) && 396 (version.to_int () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) && 397 (version.to_int () < 0x00010003u || varStore.sanitize (c, this))); 398 } 399 400 /* glyph_props is a 16-bit integer where the lower 8-bit have bits representing 401 * glyph class and other bits, and high 8-bit gthe mark attachment type (if any). 402 * Not to be confused with lookup_props which is very similar. */ 403 inline unsigned int get_glyph_props (hb_codepoint_t glyph) const 404 { 405 unsigned int klass = get_glyph_class (glyph); 406 407 static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs), ""); 408 static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures), ""); 409 static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks), ""); 410 411 switch (klass) { 412 default: return 0; 413 case BaseGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH; 414 case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE; 415 case MarkGlyph: 416 klass = get_mark_attachment_type (glyph); 417 return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8); 418 } 419 } 420 421 422 protected: 423 FixedVersion<>version; /* Version of the GDEF table--currently 424 * 0x00010003u */ 425 OffsetTo<ClassDef> 426 glyphClassDef; /* Offset to class definition table 427 * for glyph type--from beginning of 428 * GDEF header (may be Null) */ 429 OffsetTo<AttachList> 430 attachList; /* Offset to list of glyphs with 431 * attachment points--from beginning 432 * of GDEF header (may be Null) */ 433 OffsetTo<LigCaretList> 434 ligCaretList; /* Offset to list of positioning points 435 * for ligature carets--from beginning 436 * of GDEF header (may be Null) */ 437 OffsetTo<ClassDef> 438 markAttachClassDef; /* Offset to class definition table for 439 * mark attachment type--from beginning 440 * of GDEF header (may be Null) */ 441 OffsetTo<MarkGlyphSets> 442 markGlyphSetsDef; /* Offset to the table of mark set 443 * definitions--from beginning of GDEF 444 * header (may be NULL). Introduced 445 * in version 0x00010002. */ 446 LOffsetTo<VariationStore> 447 varStore; /* Offset to the table of Item Variation 448 * Store--from beginning of GDEF 449 * header (may be NULL). Introduced 450 * in version 0x00010003. */ 451 public: 452 DEFINE_SIZE_MIN (12); 453 }; 454 455 456 } /* namespace OT */ 457 458 459 #endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */ 460
