1 /* 2 * Copyright 2011,2012,2013 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #include "hb-ot-shape-complex-indic-private.hh" 28 29 /* buffer var allocations */ 30 #define myanmar_category() complex_var_u8_0() /* myanmar_category_t */ 31 #define myanmar_position() complex_var_u8_1() /* myanmar_position_t */ 32 33 34 /* 35 * Myanmar shaper. 36 */ 37 38 static const hb_tag_t 39 basic_features[] = 40 { 41 /* 42 * Basic features. 43 * These features are applied in order, one at a time, after initial_reordering. 44 */ 45 HB_TAG('r','p','h','f'), 46 HB_TAG('p','r','e','f'), 47 HB_TAG('b','l','w','f'), 48 HB_TAG('p','s','t','f'), 49 }; 50 static const hb_tag_t 51 other_features[] = 52 { 53 /* 54 * Other features. 55 * These features are applied all at once, after final_reordering. 56 */ 57 HB_TAG('p','r','e','s'), 58 HB_TAG('a','b','v','s'), 59 HB_TAG('b','l','w','s'), 60 HB_TAG('p','s','t','s'), 61 /* Positioning features, though we don't care about the types. */ 62 HB_TAG('d','i','s','t'), 63 }; 64 65 static void 66 setup_syllables (const hb_ot_shape_plan_t *plan, 67 hb_font_t *font, 68 hb_buffer_t *buffer); 69 static void 70 initial_reordering (const hb_ot_shape_plan_t *plan, 71 hb_font_t *font, 72 hb_buffer_t *buffer); 73 static void 74 final_reordering (const hb_ot_shape_plan_t *plan, 75 hb_font_t *font, 76 hb_buffer_t *buffer); 77 78 static void 79 collect_features_myanmar (hb_ot_shape_planner_t *plan) 80 { 81 hb_ot_map_builder_t *map = &plan->map; 82 83 /* Do this before any lookups have been applied. */ 84 map->add_gsub_pause (setup_syllables); 85 86 map->add_global_bool_feature (HB_TAG('l','o','c','l')); 87 /* The Indic specs do not require ccmp, but we apply it here since if 88 * there is a use of it, it's typically at the beginning. */ 89 map->add_global_bool_feature (HB_TAG('c','c','m','p')); 90 91 92 map->add_gsub_pause (initial_reordering); 93 for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++) 94 { 95 map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ); 96 map->add_gsub_pause (NULL); 97 } 98 map->add_gsub_pause (final_reordering); 99 for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++) 100 map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ); 101 } 102 103 static void 104 override_features_myanmar (hb_ot_shape_planner_t *plan) 105 { 106 plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL); 107 108 /* 109 * Note: 110 * 111 * Spec says 'mark' is used, and the mmrtext.ttf font from 112 * Windows 8 has lookups for it. But testing suggests that 113 * Windows 8 Uniscribe is NOT applying it. It *is* applying 114 * 'mkmk' however. 115 */ 116 if (hb_options ().uniscribe_bug_compatible) 117 plan->map.add_feature (HB_TAG('m','a','r','k'), 0, F_GLOBAL); 118 } 119 120 121 enum syllable_type_t { 122 consonant_syllable, 123 broken_cluster, 124 non_myanmar_cluster, 125 }; 126 127 #include "hb-ot-shape-complex-myanmar-machine.hh" 128 129 130 /* Note: This enum is duplicated in the -machine.rl source file. 131 * Not sure how to avoid duplication. */ 132 enum myanmar_category_t { 133 OT_As = 18, /* Asat */ 134 OT_D = 19, /* Digits except zero */ 135 OT_D0 = 20, /* Digit zero */ 136 OT_DB = OT_N, /* Dot below */ 137 OT_GB = OT_DOTTEDCIRCLE, 138 OT_MH = 21, /* Various consonant medial types */ 139 OT_MR = 22, /* Various consonant medial types */ 140 OT_MW = 23, /* Various consonant medial types */ 141 OT_MY = 24, /* Various consonant medial types */ 142 OT_PT = 25, /* Pwo and other tones */ 143 OT_VAbv = 26, 144 OT_VBlw = 27, 145 OT_VPre = 28, 146 OT_VPst = 29, 147 OT_VS = 30 /* Variation selectors */ 148 }; 149 150 151 static inline bool 152 is_one_of (const hb_glyph_info_t &info, unsigned int flags) 153 { 154 /* If it ligated, all bets are off. */ 155 if (is_a_ligature (info)) return false; 156 return !!(FLAG (info.myanmar_category()) & flags); 157 } 158 159 /* Note: 160 * 161 * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels 162 * cannot happen in a consonant syllable. The plus side however is, we can call the 163 * consonant syllable logic from the vowel syllable function and get it all right! */ 164 #define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CM) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_GB)) 165 static inline bool 166 is_consonant (const hb_glyph_info_t &info) 167 { 168 return is_one_of (info, CONSONANT_FLAGS); 169 } 170 171 172 static inline void 173 set_myanmar_properties (hb_glyph_info_t &info) 174 { 175 hb_codepoint_t u = info.codepoint; 176 unsigned int type = hb_indic_get_categories (u); 177 indic_category_t cat = (indic_category_t) (type & 0x7F); 178 indic_position_t pos = (indic_position_t) (type >> 8); 179 180 /* Myanmar 181 * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze 182 */ 183 if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F))) 184 cat = (indic_category_t) OT_VS; 185 else if (unlikely (u == 0x200C)) cat = (indic_category_t) OT_ZWNJ; 186 else if (unlikely (u == 0x200D)) cat = (indic_category_t) OT_ZWJ; 187 188 switch (u) 189 { 190 case 0x002D: case 0x00A0: case 0x00D7: case 0x2012: 191 case 0x2013: case 0x2014: case 0x2015: case 0x2022: 192 case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD: 193 case 0x25FE: 194 cat = (indic_category_t) OT_GB; 195 break; 196 197 case 0x1004: case 0x101B: case 0x105A: 198 cat = (indic_category_t) OT_Ra; 199 break; 200 201 case 0x1032: case 0x1036: 202 cat = (indic_category_t) OT_A; 203 break; 204 205 case 0x103A: 206 cat = (indic_category_t) OT_As; 207 break; 208 209 case 0x1041: case 0x1042: case 0x1043: case 0x1044: 210 case 0x1045: case 0x1046: case 0x1047: case 0x1048: 211 case 0x1049: case 0x1090: case 0x1091: case 0x1092: 212 case 0x1093: case 0x1094: case 0x1095: case 0x1096: 213 case 0x1097: case 0x1098: case 0x1099: 214 cat = (indic_category_t) OT_D; 215 break; 216 217 case 0x1040: 218 cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */ 219 break; 220 221 case 0x103E: case 0x1060: 222 cat = (indic_category_t) OT_MH; 223 break; 224 225 case 0x103C: 226 cat = (indic_category_t) OT_MR; 227 break; 228 229 case 0x103D: case 0x1082: 230 cat = (indic_category_t) OT_MW; 231 break; 232 233 case 0x103B: case 0x105E: case 0x105F: 234 cat = (indic_category_t) OT_MY; 235 break; 236 237 case 0x1063: case 0x1064: case 0x1069: case 0x106A: 238 case 0x106B: case 0x106C: case 0x106D: case 0xAA7B: 239 cat = (indic_category_t) OT_PT; 240 break; 241 242 case 0x1038: case 0x1087: case 0x1088: case 0x1089: 243 case 0x108A: case 0x108B: case 0x108C: case 0x108D: 244 case 0x108F: case 0x109A: case 0x109B: case 0x109C: 245 cat = (indic_category_t) OT_SM; 246 break; 247 } 248 249 if (cat == OT_M) 250 { 251 switch ((int) pos) 252 { 253 case POS_PRE_C: cat = (indic_category_t) OT_VPre; 254 pos = POS_PRE_M; break; 255 case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break; 256 case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break; 257 case POS_POST_C: cat = (indic_category_t) OT_VPst; break; 258 } 259 } 260 261 info.myanmar_category() = (myanmar_category_t) cat; 262 info.myanmar_position() = pos; 263 } 264 265 266 267 static void 268 setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED, 269 hb_buffer_t *buffer, 270 hb_font_t *font HB_UNUSED) 271 { 272 HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category); 273 HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position); 274 275 /* We cannot setup masks here. We save information about characters 276 * and setup masks later on in a pause-callback. */ 277 278 unsigned int count = buffer->len; 279 for (unsigned int i = 0; i < count; i++) 280 set_myanmar_properties (buffer->info[i]); 281 } 282 283 static void 284 setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, 285 hb_font_t *font HB_UNUSED, 286 hb_buffer_t *buffer) 287 { 288 find_syllables (buffer); 289 } 290 291 static int 292 compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 293 { 294 int a = pa->myanmar_position(); 295 int b = pb->myanmar_position(); 296 297 return a < b ? -1 : a == b ? 0 : +1; 298 } 299 300 301 /* Rules from: 302 * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */ 303 304 static void 305 initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, 306 hb_face_t *face, 307 hb_buffer_t *buffer, 308 unsigned int start, unsigned int end) 309 { 310 hb_glyph_info_t *info = buffer->info; 311 312 unsigned int base = end; 313 bool has_reph = false; 314 315 { 316 unsigned int limit = start; 317 if (start + 3 <= end && 318 info[start ].myanmar_category() == OT_Ra && 319 info[start+1].myanmar_category() == OT_As && 320 info[start+2].myanmar_category() == OT_H) 321 { 322 limit += 3; 323 base = start; 324 has_reph = true; 325 } 326 327 { 328 if (!has_reph) 329 base = limit; 330 331 for (unsigned int i = limit; i < end; i++) 332 if (is_consonant (info[i])) 333 { 334 base = i; 335 break; 336 } 337 } 338 } 339 340 /* Reorder! */ 341 { 342 unsigned int i = start; 343 for (; i < start + (has_reph ? 3 : 0); i++) 344 info[i].myanmar_position() = POS_AFTER_MAIN; 345 for (; i < base; i++) 346 info[i].myanmar_position() = POS_PRE_C; 347 if (i < end) 348 { 349 info[i].myanmar_position() = POS_BASE_C; 350 i++; 351 } 352 indic_position_t pos = POS_AFTER_MAIN; 353 /* The following loop may be ugly, but it implements all of 354 * Myanmar reordering! */ 355 for (; i < end; i++) 356 { 357 if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */ 358 { 359 info[i].myanmar_position() = POS_PRE_C; 360 continue; 361 } 362 if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */ 363 { 364 continue; 365 } 366 367 if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw) 368 { 369 pos = POS_BELOW_C; 370 info[i].myanmar_position() = pos; 371 continue; 372 } 373 374 if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A) 375 { 376 info[i].myanmar_position() = POS_BEFORE_SUB; 377 continue; 378 } 379 if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw) 380 { 381 info[i].myanmar_position() = pos; 382 continue; 383 } 384 if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A) 385 { 386 pos = POS_AFTER_SUB; 387 info[i].myanmar_position() = pos; 388 continue; 389 } 390 info[i].myanmar_position() = pos; 391 } 392 } 393 394 buffer->merge_clusters (start, end); 395 /* Sit tight, rock 'n roll! */ 396 hb_bubble_sort (info + start, end - start, compare_myanmar_order); 397 } 398 399 static void 400 initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan, 401 hb_face_t *face, 402 hb_buffer_t *buffer, 403 unsigned int start, unsigned int end) 404 { 405 /* We already inserted dotted-circles, so just call the consonant_syllable. */ 406 initial_reordering_consonant_syllable (plan, face, buffer, start, end); 407 } 408 409 static void 410 initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED, 411 hb_face_t *face HB_UNUSED, 412 hb_buffer_t *buffer HB_UNUSED, 413 unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 414 { 415 /* Nothing to do right now. If we ever switch to using the output 416 * buffer in the reordering process, we'd need to next_glyph() here. */ 417 } 418 419 420 static void 421 initial_reordering_syllable (const hb_ot_shape_plan_t *plan, 422 hb_face_t *face, 423 hb_buffer_t *buffer, 424 unsigned int start, unsigned int end) 425 { 426 syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); 427 switch (syllable_type) { 428 case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return; 429 case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return; 430 case non_myanmar_cluster: initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return; 431 } 432 } 433 434 static inline void 435 insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, 436 hb_font_t *font, 437 hb_buffer_t *buffer) 438 { 439 /* Note: This loop is extra overhead, but should not be measurable. */ 440 bool has_broken_syllables = false; 441 unsigned int count = buffer->len; 442 for (unsigned int i = 0; i < count; i++) 443 if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) { 444 has_broken_syllables = true; 445 break; 446 } 447 if (likely (!has_broken_syllables)) 448 return; 449 450 451 hb_codepoint_t dottedcircle_glyph; 452 if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph)) 453 return; 454 455 hb_glyph_info_t dottedcircle = {0}; 456 dottedcircle.codepoint = 0x25CC; 457 set_myanmar_properties (dottedcircle); 458 dottedcircle.codepoint = dottedcircle_glyph; 459 460 buffer->clear_output (); 461 462 buffer->idx = 0; 463 unsigned int last_syllable = 0; 464 while (buffer->idx < buffer->len) 465 { 466 unsigned int syllable = buffer->cur().syllable(); 467 syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); 468 if (unlikely (last_syllable != syllable && syllable_type == broken_cluster)) 469 { 470 last_syllable = syllable; 471 472 hb_glyph_info_t info = dottedcircle; 473 info.cluster = buffer->cur().cluster; 474 info.mask = buffer->cur().mask; 475 info.syllable() = buffer->cur().syllable(); 476 477 buffer->output_info (info); 478 } 479 else 480 buffer->next_glyph (); 481 } 482 483 buffer->swap_buffers (); 484 } 485 486 static void 487 initial_reordering (const hb_ot_shape_plan_t *plan, 488 hb_font_t *font, 489 hb_buffer_t *buffer) 490 { 491 insert_dotted_circles (plan, font, buffer); 492 493 hb_glyph_info_t *info = buffer->info; 494 unsigned int count = buffer->len; 495 if (unlikely (!count)) return; 496 unsigned int last = 0; 497 unsigned int last_syllable = info[0].syllable(); 498 for (unsigned int i = 1; i < count; i++) 499 if (last_syllable != info[i].syllable()) { 500 initial_reordering_syllable (plan, font->face, buffer, last, i); 501 last = i; 502 last_syllable = info[last].syllable(); 503 } 504 initial_reordering_syllable (plan, font->face, buffer, last, count); 505 } 506 507 static void 508 final_reordering (const hb_ot_shape_plan_t *plan, 509 hb_font_t *font HB_UNUSED, 510 hb_buffer_t *buffer) 511 { 512 hb_glyph_info_t *info = buffer->info; 513 unsigned int count = buffer->len; 514 515 /* Zero syllables now... */ 516 for (unsigned int i = 0; i < count; i++) 517 info[i].syllable() = 0; 518 519 HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category); 520 HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position); 521 } 522 523 524 static hb_ot_shape_normalization_mode_t 525 normalization_preference_myanmar (const hb_segment_properties_t *props HB_UNUSED) 526 { 527 return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT; 528 } 529 530 531 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar = 532 { 533 "myanmar", 534 collect_features_myanmar, 535 override_features_myanmar, 536 NULL, /* data_create */ 537 NULL, /* data_destroy */ 538 NULL, /* preprocess_text */ 539 normalization_preference_myanmar, 540 NULL, /* decompose */ 541 NULL, /* compose */ 542 setup_masks_myanmar, 543 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF, 544 false, /* fallback_position */ 545 }; 546
