hb-ot-layout.cc revision c44733596c6648e209c12349e18e35424edf3d59
1/* 2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg 3 * Copyright (C) 2006 Behdad Esfahbod 4 * Copyright (C) 2007,2008 Red Hat, Inc. 5 * 6 * This is part of HarfBuzz, an OpenType Layout engine library. 7 * 8 * Permission is hereby granted, without written agreement and without 9 * license or royalty fees, to use, copy, modify, and distribute this 10 * software and its documentation for any purpose, provided that the 11 * above copyright notice and the following two paragraphs appear in 12 * all copies of this software. 13 * 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 18 * DAMAGE. 19 * 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 25 * 26 * Red Hat Author(s): Behdad Esfahbod 27 */ 28 29#define HB_OT_LAYOUT_CC 30 31#include "hb-ot-layout.h" 32#include "hb-ot-layout-private.h" 33 34#include "hb-ot-layout-open-private.h" 35#include "hb-ot-layout-gdef-private.h" 36#include "hb-ot-layout-gsub-private.h" 37 38 39#include <stdlib.h> 40#include <string.h> 41 42 43struct _hb_ot_layout_t { 44 const GDEF *gdef; 45 const GSUB *gsub; 46 const /*XXX*/GSUBGPOS *gpos; 47 48 struct { 49 unsigned char *klasses; 50 unsigned int len; 51 } new_gdef; 52 53}; 54 55hb_ot_layout_t * 56hb_ot_layout_create (void) 57{ 58 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t)); 59 60 layout->gdef = &NullGDEF; 61 layout->gsub = &NullGSUB; 62 layout->gpos = &/*XXX*/NullGSUBGPOS; 63 64 return layout; 65} 66 67hb_ot_layout_t * 68hb_ot_layout_create_for_data (const char *font_data, 69 int face_index) 70{ 71 hb_ot_layout_t *layout; 72 73 if (HB_UNLIKELY (font_data == NULL)) 74 return hb_ot_layout_create (); 75 76 layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t)); 77 78 const OpenTypeFontFile &font = OpenTypeFontFile::get_for_data (font_data); 79 const OpenTypeFontFace &face = font.get_face (face_index); 80 81 layout->gdef = &GDEF::get_for_data (font.get_table_data (face.get_table_by_tag (GDEF::Tag))); 82 layout->gsub = &GSUB::get_for_data (font.get_table_data (face.get_table_by_tag (GSUB::Tag))); 83 layout->gpos = &/*XXX*/GSUBGPOS::get_for_data (font.get_table_data (face.get_table_by_tag (/*XXX*/GSUBGPOS::GPOSTag))); 84 85 return layout; 86} 87 88void 89hb_ot_layout_destroy (hb_ot_layout_t *layout) 90{ 91 free (layout); 92} 93 94/* 95 * GDEF 96 */ 97 98hb_bool_t 99hb_ot_layout_has_font_glyph_classes (hb_ot_layout_t *layout) 100{ 101 return layout->gdef->has_glyph_classes (); 102} 103 104HB_OT_LAYOUT_INTERNAL hb_bool_t 105_hb_ot_layout_has_new_glyph_classes (hb_ot_layout_t *layout) 106{ 107 return layout->new_gdef.len > 0; 108} 109 110HB_OT_LAYOUT_INTERNAL hb_ot_layout_glyph_properties_t 111_hb_ot_layout_get_glyph_properties (hb_ot_layout_t *layout, 112 hb_glyph_t glyph) 113{ 114 hb_ot_layout_class_t klass; 115 116 /* TODO old harfbuzz doesn't always parse mark attachments as it says it was 117 * introduced without a version bump, so it may not be safe */ 118 klass = layout->gdef->get_mark_attachment_type (glyph); 119 if (klass) 120 return klass << 8; 121 122 klass = layout->gdef->get_glyph_class (glyph); 123 124 if (!klass && glyph < layout->new_gdef.len) 125 klass = layout->new_gdef.klasses[glyph]; 126 127 switch (klass) { 128 default: 129 case GDEF::UnclassifiedGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED; 130 case GDEF::BaseGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH; 131 case GDEF::LigatureGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE; 132 case GDEF::MarkGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_MARK; 133 case GDEF::ComponentGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT; 134 } 135} 136 137HB_OT_LAYOUT_INTERNAL hb_bool_t 138_hb_ot_layout_check_glyph_properties (hb_ot_layout_t *layout, 139 HB_GlyphItem gitem, 140 hb_ot_layout_lookup_flags_t lookup_flags, 141 hb_ot_layout_glyph_properties_t *property) 142{ 143 hb_ot_layout_glyph_class_t basic_glyph_class; 144 hb_ot_layout_glyph_properties_t desired_attachment_class; 145 146 if (gitem->gproperties == HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN) 147 { 148 gitem->gproperties = *property = _hb_ot_layout_get_glyph_properties (layout, gitem->gindex); 149 if (gitem->gproperties == HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED) 150 return false; 151 } 152 153 *property = gitem->gproperties; 154 155 /* If the glyph was found in the MarkAttachmentClass table, 156 * then that class value is the high byte of the result, 157 * otherwise the low byte contains the basic type of the glyph 158 * as defined by the GlyphClassDef table. 159 */ 160 if (*property & LookupFlag::MarkAttachmentType) 161 basic_glyph_class = HB_OT_LAYOUT_GLYPH_CLASS_MARK; 162 else 163 basic_glyph_class = (hb_ot_layout_glyph_class_t) *property; 164 165 /* Not covered, if, for example, basic_glyph_class 166 * is HB_GDEF_LIGATURE and lookup_flags includes LookupFlags::IgnoreLigatures 167 */ 168 if (lookup_flags & basic_glyph_class) 169 return false; 170 171 /* The high byte of lookup_flags has the meaning 172 * "ignore marks of attachment type different than 173 * the attachment type specified." 174 */ 175 desired_attachment_class = lookup_flags & LookupFlag::MarkAttachmentType; 176 if (desired_attachment_class) 177 { 178 if (basic_glyph_class == HB_OT_LAYOUT_GLYPH_CLASS_MARK && 179 *property != desired_attachment_class ) 180 return false; 181 } 182 183 return true; 184} 185 186 187hb_ot_layout_glyph_class_t 188hb_ot_layout_get_glyph_class (hb_ot_layout_t *layout, 189 hb_glyph_t glyph) 190{ 191 hb_ot_layout_glyph_properties_t properties; 192 hb_ot_layout_class_t klass; 193 194 properties = _hb_ot_layout_get_glyph_properties (layout, glyph); 195 196 if (properties & 0xFF00) 197 return HB_OT_LAYOUT_GLYPH_CLASS_MARK; 198 199 return (hb_ot_layout_glyph_class_t) properties; 200} 201 202void 203hb_ot_layout_set_glyph_class (hb_ot_layout_t *layout, 204 hb_glyph_t glyph, 205 hb_ot_layout_glyph_class_t klass) 206{ 207 /* TODO optimize this, similar to old harfbuzz code for example */ 208 209 hb_ot_layout_class_t gdef_klass; 210 int len = layout->new_gdef.len; 211 212 if (glyph >= len) { 213 int new_len; 214 unsigned char *new_klasses; 215 216 new_len = len == 0 ? 120 : 2 * len; 217 if (new_len > 65535) 218 new_len = 65535; 219 new_klasses = (unsigned char *) realloc (layout->new_gdef.klasses, new_len * sizeof (unsigned char)); 220 221 if (G_UNLIKELY (!new_klasses)) 222 return; 223 224 memset (new_klasses + len, 0, new_len - len); 225 226 layout->new_gdef.klasses = new_klasses; 227 layout->new_gdef.len = new_len; 228 } 229 230 switch (klass) { 231 default: 232 case HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED: gdef_klass = GDEF::UnclassifiedGlyph; break; 233 case HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH: gdef_klass = GDEF::BaseGlyph; break; 234 case HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE: gdef_klass = GDEF::LigatureGlyph; break; 235 case HB_OT_LAYOUT_GLYPH_CLASS_MARK: gdef_klass = GDEF::MarkGlyph; break; 236 case HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT: gdef_klass = GDEF::ComponentGlyph; break; 237 } 238 239 layout->new_gdef.klasses[glyph] = gdef_klass; 240 return; 241} 242 243void 244hb_ot_layout_build_glyph_classes (hb_ot_layout_t *layout, 245 uint16_t num_total_glyphs, 246 hb_glyph_t *glyphs, 247 unsigned char *klasses, 248 uint16_t count) 249{ 250 int i; 251 252 if (G_UNLIKELY (!count || !glyphs || !klasses)) 253 return; 254 255 if (layout->new_gdef.len == 0) { 256 layout->new_gdef.klasses = (unsigned char *) calloc (num_total_glyphs, sizeof (unsigned char)); 257 layout->new_gdef.len = count; 258 } 259 260 for (i = 0; i < count; i++) 261 hb_ot_layout_set_glyph_class (layout, glyphs[i], (hb_ot_layout_glyph_class_t) klasses[i]); 262} 263 264/* 265 * GSUB/GPOS 266 */ 267 268static const GSUBGPOS& 269get_gsubgpos_table (hb_ot_layout_t *layout, 270 hb_ot_layout_table_type_t table_type) 271{ 272 switch (table_type) { 273 case HB_OT_LAYOUT_TABLE_TYPE_GSUB: return *(layout->gsub); 274 case HB_OT_LAYOUT_TABLE_TYPE_GPOS: return *(layout->gpos); 275 default: return NullGSUBGPOS; 276 } 277} 278 279 280unsigned int 281hb_ot_layout_table_get_script_count (hb_ot_layout_t *layout, 282 hb_ot_layout_table_type_t table_type) 283{ 284 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 285 286 return g.get_script_count (); 287} 288 289hb_tag_t 290hb_ot_layout_table_get_script_tag (hb_ot_layout_t *layout, 291 hb_ot_layout_table_type_t table_type, 292 unsigned int script_index) 293{ 294 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 295 296 return g.get_script_tag (script_index); 297} 298 299hb_bool_t 300hb_ot_layout_table_find_script (hb_ot_layout_t *layout, 301 hb_ot_layout_table_type_t table_type, 302 hb_tag_t script_tag, 303 unsigned int *script_index) 304{ 305 ASSERT_STATIC (NO_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX); 306 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 307 308 if (g.find_script_index (script_tag, script_index)) 309 return TRUE; 310 311 /* try finding 'DFLT' */ 312 if (g.find_script_index (HB_OT_LAYOUT_TAG_DEFAULT_SCRIPT, script_index)) 313 return FALSE; 314 315 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ 316 if (g.find_script_index (HB_OT_LAYOUT_TAG_DEFAULT_LANGUAGE, script_index)) 317 return FALSE; 318 319 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX; 320 return FALSE; 321} 322 323unsigned int 324hb_ot_layout_table_get_feature_count (hb_ot_layout_t *layout, 325 hb_ot_layout_table_type_t table_type) 326{ 327 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 328 329 return g.get_feature_count (); 330} 331 332hb_tag_t 333hb_ot_layout_table_get_feature_tag (hb_ot_layout_t *layout, 334 hb_ot_layout_table_type_t table_type, 335 unsigned int feature_index) 336{ 337 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 338 339 return g.get_feature_tag (feature_index); 340} 341 342hb_bool_t 343hb_ot_layout_table_find_feature (hb_ot_layout_t *layout, 344 hb_ot_layout_table_type_t table_type, 345 hb_tag_t feature_tag, 346 unsigned int *feature_index) 347{ 348 ASSERT_STATIC (NO_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX); 349 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 350 351 if (g.find_feature_index (feature_tag, feature_index)) 352 return TRUE; 353 354 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX; 355 return FALSE; 356} 357 358unsigned int 359hb_ot_layout_table_get_lookup_count (hb_ot_layout_t *layout, 360 hb_ot_layout_table_type_t table_type) 361{ 362 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 363 364 return g.get_lookup_count (); 365} 366 367 368unsigned int 369hb_ot_layout_script_get_language_count (hb_ot_layout_t *layout, 370 hb_ot_layout_table_type_t table_type, 371 unsigned int script_index) 372{ 373 const Script &s = get_gsubgpos_table (layout, table_type).get_script (script_index); 374 375 return s.get_lang_sys_count (); 376} 377 378hb_tag_t 379hb_ot_layout_script_get_language_tag (hb_ot_layout_t *layout, 380 hb_ot_layout_table_type_t table_type, 381 unsigned int script_index, 382 unsigned int language_index) 383{ 384 const Script &s = get_gsubgpos_table (layout, table_type).get_script (script_index); 385 386 return s.get_lang_sys_tag (language_index); 387} 388 389hb_bool_t 390hb_ot_layout_script_find_language (hb_ot_layout_t *layout, 391 hb_ot_layout_table_type_t table_type, 392 unsigned int script_index, 393 hb_tag_t language_tag, 394 unsigned int *language_index) 395{ 396 ASSERT_STATIC (NO_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX); 397 const Script &s = get_gsubgpos_table (layout, table_type).get_script (script_index); 398 399 if (s.find_lang_sys_index (language_tag, language_index)) 400 return TRUE; 401 402 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ 403 if (s.find_lang_sys_index (HB_OT_LAYOUT_TAG_DEFAULT_LANGUAGE, language_index)) 404 return FALSE; 405 406 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX; 407 return FALSE; 408} 409 410hb_bool_t 411hb_ot_layout_language_get_required_feature_index (hb_ot_layout_t *layout, 412 hb_ot_layout_table_type_t table_type, 413 unsigned int script_index, 414 unsigned int language_index, 415 unsigned int *feature_index) 416{ 417 const LangSys &l = get_gsubgpos_table (layout, table_type).get_script (script_index).get_lang_sys (language_index); 418 419 if (feature_index) *feature_index = l.get_required_feature_index (); 420 421 return l.has_required_feature (); 422} 423 424unsigned int 425hb_ot_layout_language_get_feature_count (hb_ot_layout_t *layout, 426 hb_ot_layout_table_type_t table_type, 427 unsigned int script_index, 428 unsigned int language_index) 429{ 430 const LangSys &l = get_gsubgpos_table (layout, table_type).get_script (script_index).get_lang_sys (language_index); 431 432 return l.get_feature_count (); 433} 434 435unsigned int 436hb_ot_layout_language_get_feature_index (hb_ot_layout_t *layout, 437 hb_ot_layout_table_type_t table_type, 438 unsigned int script_index, 439 unsigned int language_index, 440 unsigned int num_feature) 441{ 442 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 443 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 444 445 return l.get_feature_index (num_feature); 446} 447 448hb_tag_t 449hb_ot_layout_language_get_feature_tag (hb_ot_layout_t *layout, 450 hb_ot_layout_table_type_t table_type, 451 unsigned int script_index, 452 unsigned int language_index, 453 unsigned int num_feature) 454{ 455 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 456 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 457 unsigned int feature_index = l.get_feature_index (num_feature); 458 459 return g.get_feature_tag (feature_index); 460} 461 462 463hb_bool_t 464hb_ot_layout_language_find_feature (hb_ot_layout_t *layout, 465 hb_ot_layout_table_type_t table_type, 466 unsigned int script_index, 467 unsigned int language_index, 468 hb_tag_t feature_tag, 469 unsigned int *feature_index) 470{ 471 ASSERT_STATIC (NO_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX); 472 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 473 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 474 unsigned int i; 475 476 for (i = 0; i < l.get_feature_count (); i++) { 477 unsigned int f_index = l.get_feature_index (i); 478 479 if (feature_tag == g.get_feature_tag (f_index)) { 480 if (feature_index) *feature_index = f_index; 481 return TRUE; 482 } 483 } 484 485 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX; 486 return FALSE; 487} 488 489unsigned int 490hb_ot_layout_feature_get_lookup_count (hb_ot_layout_t *layout, 491 hb_ot_layout_table_type_t table_type, 492 unsigned int feature_index) 493{ 494 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 495 const Feature &f = g.get_feature (feature_index); 496 497 return f.get_lookup_count (); 498} 499 500unsigned int 501hb_ot_layout_feature_get_lookup_index (hb_ot_layout_t *layout, 502 hb_ot_layout_table_type_t table_type, 503 unsigned int feature_index, 504 unsigned int num_lookup) 505{ 506 const GSUBGPOS &g = get_gsubgpos_table (layout, table_type); 507 const Feature &f = g.get_feature (feature_index); 508 509 return f.get_lookup_index (num_lookup); 510} 511