hb-ot-layout.cc revision c2709119c8c610a0d4d71884a7d4fdba7cb65b72
1/* 2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg 3 * Copyright (C) 2006 Behdad Esfahbod 4 * Copyright (C) 2007,2008,2009 Red Hat, Inc. 5 * 6 * This is part of HarfBuzz, a text shaping 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-private.hh" 32 33#include "hb-ot-layout-gdef-private.hh" 34#include "hb-ot-layout-gsub-private.hh" 35#include "hb-ot-layout-gpos-private.hh" 36 37 38#include <stdlib.h> 39#include <string.h> 40 41HB_BEGIN_DECLS 42 43 44hb_ot_layout_t * 45_hb_ot_layout_new (hb_face_t *face) 46{ 47 /* Remove this object altogether */ 48 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t)); 49 50 layout->gdef_blob = Sanitizer<GDEF>::sanitize (hb_face_get_table (face, HB_OT_TAG_GDEF)); 51 layout->gdef = Sanitizer<GDEF>::lock_instance (layout->gdef_blob); 52 53 layout->gsub_blob = Sanitizer<GSUB>::sanitize (hb_face_get_table (face, HB_OT_TAG_GSUB)); 54 layout->gsub = Sanitizer<GSUB>::lock_instance (layout->gsub_blob); 55 56 layout->gpos_blob = Sanitizer<GPOS>::sanitize (hb_face_get_table (face, HB_OT_TAG_GPOS)); 57 layout->gpos = Sanitizer<GPOS>::lock_instance (layout->gpos_blob); 58 59 return layout; 60} 61 62void 63_hb_ot_layout_free (hb_ot_layout_t *layout) 64{ 65 hb_blob_unlock (layout->gdef_blob); 66 hb_blob_unlock (layout->gsub_blob); 67 hb_blob_unlock (layout->gpos_blob); 68 69 hb_blob_destroy (layout->gdef_blob); 70 hb_blob_destroy (layout->gsub_blob); 71 hb_blob_destroy (layout->gpos_blob); 72 73 free (layout); 74} 75 76static inline const GDEF& 77_get_gdef (hb_face_t *face) 78{ 79 return likely (face->ot_layout && face->ot_layout->gdef) ? *face->ot_layout->gdef : Null(GDEF); 80} 81 82static inline const GSUB& 83_get_gsub (hb_face_t *face) 84{ 85 return likely (face->ot_layout && face->ot_layout->gsub) ? *face->ot_layout->gsub : Null(GSUB); 86} 87 88static inline const GPOS& 89_get_gpos (hb_face_t *face) 90{ 91 return likely (face->ot_layout && face->ot_layout->gpos) ? *face->ot_layout->gpos : Null(GPOS); 92} 93 94 95/* 96 * GDEF 97 */ 98 99hb_bool_t 100hb_ot_layout_has_glyph_classes (hb_face_t *face) 101{ 102 return _get_gdef (face).has_glyph_classes (); 103} 104 105unsigned int 106_hb_ot_layout_get_glyph_property (hb_face_t *face, 107 hb_glyph_info_t *info) 108{ 109 if (!info->props_cache()) 110 { 111 const GDEF &gdef = _get_gdef (face); 112 info->props_cache() = gdef.get_glyph_props (info->codepoint); 113 } 114 115 return info->props_cache(); 116} 117 118hb_bool_t 119_hb_ot_layout_check_glyph_property (hb_face_t *face, 120 hb_glyph_info_t *ginfo, 121 unsigned int lookup_props, 122 unsigned int *property_out) 123{ 124 unsigned int property; 125 126 property = _hb_ot_layout_get_glyph_property (face, ginfo); 127 if (property_out) 128 *property_out = property; 129 130 /* Not covered, if, for example, glyph class is ligature and 131 * lookup_props includes LookupFlags::IgnoreLigatures 132 */ 133 if (property & lookup_props & LookupFlag::IgnoreFlags) 134 return false; 135 136 if (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK) 137 { 138 /* If using mark filtering sets, the high short of 139 * lookup_props has the set index. 140 */ 141 if (lookup_props & LookupFlag::UseMarkFilteringSet) 142 return _get_gdef (face).mark_set_covers (lookup_props >> 16, ginfo->codepoint); 143 144 /* The second byte of lookup_props has the meaning 145 * "ignore marks of attachment type different than 146 * the attachment type specified." 147 */ 148 if (lookup_props & LookupFlag::MarkAttachmentType && property & LookupFlag::MarkAttachmentType) 149 return (lookup_props & LookupFlag::MarkAttachmentType) == (property & LookupFlag::MarkAttachmentType); 150 } 151 152 return true; 153} 154 155unsigned int 156hb_ot_layout_get_attach_points (hb_face_t *face, 157 hb_codepoint_t glyph, 158 unsigned int start_offset, 159 unsigned int *point_count /* IN/OUT */, 160 unsigned int *point_array /* OUT */) 161{ 162 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array); 163} 164 165unsigned int 166hb_ot_layout_get_ligature_carets (hb_font_t *font, 167 hb_face_t *face, 168 hb_direction_t direction, 169 hb_codepoint_t glyph, 170 unsigned int start_offset, 171 unsigned int *caret_count /* IN/OUT */, 172 int *caret_array /* OUT */) 173{ 174 hb_ot_layout_context_t c; 175 c.font = font; 176 c.face = face; 177 return _get_gdef (face).get_lig_carets (&c, direction, glyph, start_offset, caret_count, caret_array); 178} 179 180/* 181 * GSUB/GPOS 182 */ 183 184static const GSUBGPOS& 185get_gsubgpos_table (hb_face_t *face, 186 hb_tag_t table_tag) 187{ 188 switch (table_tag) { 189 case HB_OT_TAG_GSUB: return _get_gsub (face); 190 case HB_OT_TAG_GPOS: return _get_gpos (face); 191 default: return Null(GSUBGPOS); 192 } 193} 194 195 196unsigned int 197hb_ot_layout_table_get_script_tags (hb_face_t *face, 198 hb_tag_t table_tag, 199 unsigned int start_offset, 200 unsigned int *script_count /* IN/OUT */, 201 hb_tag_t *script_tags /* OUT */) 202{ 203 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 204 205 return g.get_script_tags (start_offset, script_count, script_tags); 206} 207 208hb_bool_t 209hb_ot_layout_table_find_script (hb_face_t *face, 210 hb_tag_t table_tag, 211 hb_tag_t script_tag, 212 unsigned int *script_index) 213{ 214 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX); 215 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 216 217 if (g.find_script_index (script_tag, script_index)) 218 return TRUE; 219 220 /* try finding 'DFLT' */ 221 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) 222 return FALSE; 223 224 /* try with 'dflt'; MS site has had typos and many fonts use it now :(. 225 * including many versions of DejaVu Sans Mono! */ 226 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) 227 return FALSE; 228 229 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX; 230 return FALSE; 231} 232 233hb_bool_t 234hb_ot_layout_table_choose_script (hb_face_t *face, 235 hb_tag_t table_tag, 236 const hb_tag_t *script_tags, 237 unsigned int *script_index) 238{ 239 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX); 240 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 241 242 while (*script_tags) 243 { 244 if (g.find_script_index (*script_tags, script_index)) 245 return TRUE; 246 script_tags++; 247 } 248 249 /* try finding 'DFLT' */ 250 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) 251 return FALSE; 252 253 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ 254 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) 255 return FALSE; 256 257 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX; 258 return FALSE; 259} 260 261unsigned int 262hb_ot_layout_table_get_feature_tags (hb_face_t *face, 263 hb_tag_t table_tag, 264 unsigned int start_offset, 265 unsigned int *feature_count /* IN/OUT */, 266 hb_tag_t *feature_tags /* OUT */) 267{ 268 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 269 270 return g.get_feature_tags (start_offset, feature_count, feature_tags); 271} 272 273 274unsigned int 275hb_ot_layout_script_get_language_tags (hb_face_t *face, 276 hb_tag_t table_tag, 277 unsigned int script_index, 278 unsigned int start_offset, 279 unsigned int *language_count /* IN/OUT */, 280 hb_tag_t *language_tags /* OUT */) 281{ 282 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index); 283 284 return s.get_lang_sys_tags (start_offset, language_count, language_tags); 285} 286 287hb_bool_t 288hb_ot_layout_script_find_language (hb_face_t *face, 289 hb_tag_t table_tag, 290 unsigned int script_index, 291 hb_tag_t language_tag, 292 unsigned int *language_index) 293{ 294 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX); 295 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index); 296 297 if (s.find_lang_sys_index (language_tag, language_index)) 298 return TRUE; 299 300 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ 301 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index)) 302 return FALSE; 303 304 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX; 305 return FALSE; 306} 307 308hb_bool_t 309hb_ot_layout_language_get_required_feature_index (hb_face_t *face, 310 hb_tag_t table_tag, 311 unsigned int script_index, 312 unsigned int language_index, 313 unsigned int *feature_index) 314{ 315 const LangSys &l = get_gsubgpos_table (face, table_tag).get_script (script_index).get_lang_sys (language_index); 316 317 if (feature_index) *feature_index = l.get_required_feature_index (); 318 319 return l.has_required_feature (); 320} 321 322unsigned int 323hb_ot_layout_language_get_feature_indexes (hb_face_t *face, 324 hb_tag_t table_tag, 325 unsigned int script_index, 326 unsigned int language_index, 327 unsigned int start_offset, 328 unsigned int *feature_count /* IN/OUT */, 329 unsigned int *feature_indexes /* OUT */) 330{ 331 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 332 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 333 334 return l.get_feature_indexes (start_offset, feature_count, feature_indexes); 335} 336 337unsigned int 338hb_ot_layout_language_get_feature_tags (hb_face_t *face, 339 hb_tag_t table_tag, 340 unsigned int script_index, 341 unsigned int language_index, 342 unsigned int start_offset, 343 unsigned int *feature_count /* IN/OUT */, 344 hb_tag_t *feature_tags /* OUT */) 345{ 346 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 347 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 348 349 ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t)); 350 unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags); 351 352 if (feature_tags) { 353 unsigned int count = *feature_count; 354 for (unsigned int i = 0; i < count; i++) 355 feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]); 356 } 357 358 return ret; 359} 360 361 362hb_bool_t 363hb_ot_layout_language_find_feature (hb_face_t *face, 364 hb_tag_t table_tag, 365 unsigned int script_index, 366 unsigned int language_index, 367 hb_tag_t feature_tag, 368 unsigned int *feature_index) 369{ 370 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX); 371 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 372 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index); 373 374 unsigned int num_features = l.get_feature_count (); 375 for (unsigned int i = 0; i < num_features; i++) { 376 unsigned int f_index = l.get_feature_index (i); 377 378 if (feature_tag == g.get_feature_tag (f_index)) { 379 if (feature_index) *feature_index = f_index; 380 return TRUE; 381 } 382 } 383 384 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX; 385 return FALSE; 386} 387 388unsigned int 389hb_ot_layout_feature_get_lookup_indexes (hb_face_t *face, 390 hb_tag_t table_tag, 391 unsigned int feature_index, 392 unsigned int start_offset, 393 unsigned int *lookup_count /* IN/OUT */, 394 unsigned int *lookup_indexes /* OUT */) 395{ 396 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag); 397 const Feature &f = g.get_feature (feature_index); 398 399 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes); 400} 401 402 403/* 404 * GSUB 405 */ 406 407hb_bool_t 408hb_ot_layout_has_substitution (hb_face_t *face) 409{ 410 return &_get_gsub (face) != &Null(GSUB); 411} 412 413hb_bool_t 414hb_ot_layout_substitute_lookup (hb_face_t *face, 415 hb_buffer_t *buffer, 416 unsigned int lookup_index, 417 hb_mask_t mask) 418{ 419 hb_ot_layout_context_t c; 420 c.font = NULL; 421 c.face = face; 422 return _get_gsub (face).substitute_lookup (&c, buffer, lookup_index, mask); 423} 424 425 426/* 427 * GPOS 428 */ 429 430hb_bool_t 431hb_ot_layout_has_positioning (hb_face_t *face) 432{ 433 return &_get_gpos (face) != &Null(GPOS); 434} 435 436hb_bool_t 437hb_ot_layout_position_lookup (hb_font_t *font, 438 hb_face_t *face, 439 hb_buffer_t *buffer, 440 unsigned int lookup_index, 441 hb_mask_t mask) 442{ 443 hb_ot_layout_context_t c; 444 c.font = font; 445 c.face = face; 446 return _get_gpos (face).position_lookup (&c, buffer, lookup_index, mask); 447} 448 449void 450hb_ot_layout_position_finish (hb_buffer_t *buffer) 451{ 452 GPOS::position_finish (buffer); 453} 454 455 456HB_END_DECLS 457