1/* 2 * Copyright �� 2011,2012 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#include "hb-ot-layout-private.hh" 29 30/* buffer var allocations */ 31#define indic_category() complex_var_u8_0() /* indic_category_t */ 32#define indic_position() complex_var_u8_1() /* indic_position_t */ 33 34 35/* 36 * Indic shaper. 37 */ 38 39 40#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7Fu) == (Base)) 41 42#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x0900u)) 43#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x0980u)) 44#define IS_GURU(u) (IN_HALF_BLOCK (u, 0x0A00u)) 45#define IS_GUJR(u) (IN_HALF_BLOCK (u, 0x0A80u)) 46#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0x0B00u)) 47#define IS_TAML(u) (IN_HALF_BLOCK (u, 0x0B80u)) 48#define IS_TELU(u) (IN_HALF_BLOCK (u, 0x0C00u)) 49#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0x0C80u)) 50#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0x0D00u)) 51#define IS_SINH(u) (IN_HALF_BLOCK (u, 0x0D80u)) 52#define IS_KHMR(u) (IN_HALF_BLOCK (u, 0x1780u)) 53 54 55#define MATRA_POS_LEFT(u) POS_PRE_M 56#define MATRA_POS_RIGHT(u) ( \ 57 IS_DEVA(u) ? POS_AFTER_SUB : \ 58 IS_BENG(u) ? POS_AFTER_POST : \ 59 IS_GURU(u) ? POS_AFTER_POST : \ 60 IS_GUJR(u) ? POS_AFTER_POST : \ 61 IS_ORYA(u) ? POS_AFTER_POST : \ 62 IS_TAML(u) ? POS_AFTER_POST : \ 63 IS_TELU(u) ? (u <= 0x0C42u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 64 IS_KNDA(u) ? (u < 0x0CC3u || u > 0xCD6u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 65 IS_MLYM(u) ? POS_AFTER_POST : \ 66 IS_SINH(u) ? POS_AFTER_SUB : \ 67 IS_KHMR(u) ? POS_AFTER_POST : \ 68 /*default*/ POS_AFTER_SUB \ 69 ) 70#define MATRA_POS_TOP(u) ( /* BENG and MLYM don't have top matras. */ \ 71 IS_DEVA(u) ? POS_AFTER_SUB : \ 72 IS_GURU(u) ? POS_AFTER_POST : /* Deviate from spec */ \ 73 IS_GUJR(u) ? POS_AFTER_SUB : \ 74 IS_ORYA(u) ? POS_AFTER_MAIN : \ 75 IS_TAML(u) ? POS_AFTER_SUB : \ 76 IS_TELU(u) ? POS_BEFORE_SUB : \ 77 IS_KNDA(u) ? POS_BEFORE_SUB : \ 78 IS_SINH(u) ? POS_AFTER_SUB : \ 79 IS_KHMR(u) ? POS_AFTER_POST : \ 80 /*default*/ POS_AFTER_SUB \ 81 ) 82#define MATRA_POS_BOTTOM(u) ( \ 83 IS_DEVA(u) ? POS_AFTER_SUB : \ 84 IS_BENG(u) ? POS_AFTER_SUB : \ 85 IS_GURU(u) ? POS_AFTER_POST : \ 86 IS_GUJR(u) ? POS_AFTER_POST : \ 87 IS_ORYA(u) ? POS_AFTER_SUB : \ 88 IS_TAML(u) ? POS_AFTER_POST : \ 89 IS_TELU(u) ? POS_BEFORE_SUB : \ 90 IS_KNDA(u) ? POS_BEFORE_SUB : \ 91 IS_MLYM(u) ? POS_AFTER_POST : \ 92 IS_SINH(u) ? POS_AFTER_SUB : \ 93 IS_KHMR(u) ? POS_AFTER_POST : \ 94 /*default*/ POS_AFTER_SUB \ 95 ) 96 97static inline indic_position_t 98matra_position (hb_codepoint_t u, indic_position_t side) 99{ 100 switch ((int) side) 101 { 102 case POS_PRE_C: return MATRA_POS_LEFT (u); 103 case POS_POST_C: return MATRA_POS_RIGHT (u); 104 case POS_ABOVE_C: return MATRA_POS_TOP (u); 105 case POS_BELOW_C: return MATRA_POS_BOTTOM (u); 106 }; 107 return side; 108} 109 110/* XXX 111 * This is a hack for now. We should move this data into the main Indic table. 112 * Or completely remove it and just check in the tables. 113 */ 114static const hb_codepoint_t ra_chars[] = { 115 0x0930u, /* Devanagari */ 116 0x09B0u, /* Bengali */ 117 0x09F0u, /* Bengali */ 118 0x0A30u, /* Gurmukhi */ /* No Reph */ 119 0x0AB0u, /* Gujarati */ 120 0x0B30u, /* Oriya */ 121 0x0BB0u, /* Tamil */ /* No Reph */ 122 0x0C30u, /* Telugu */ /* Reph formed only with ZWJ */ 123 0x0CB0u, /* Kannada */ 124 0x0D30u, /* Malayalam */ /* No Reph, Logical Repha */ 125 126 0x0DBBu, /* Sinhala */ /* Reph formed only with ZWJ */ 127 128 0x179Au, /* Khmer */ /* No Reph, Visual Repha */ 129}; 130 131static inline bool 132is_ra (hb_codepoint_t u) 133{ 134 for (unsigned int i = 0; i < ARRAY_LENGTH (ra_chars); i++) 135 if (u == ra_chars[i]) 136 return true; 137 return false; 138} 139 140static inline bool 141is_one_of (const hb_glyph_info_t &info, unsigned int flags) 142{ 143 /* If it ligated, all bets are off. */ 144 if (_hb_glyph_info_ligated (&info)) return false; 145 return !!(FLAG_SAFE (info.indic_category()) & flags); 146} 147 148static inline bool 149is_joiner (const hb_glyph_info_t &info) 150{ 151 return is_one_of (info, JOINER_FLAGS); 152} 153 154static inline bool 155is_consonant (const hb_glyph_info_t &info) 156{ 157 return is_one_of (info, CONSONANT_FLAGS); 158} 159 160static inline bool 161is_halant_or_coeng (const hb_glyph_info_t &info) 162{ 163 return is_one_of (info, HALANT_OR_COENG_FLAGS); 164} 165 166static inline void 167set_indic_properties (hb_glyph_info_t &info) 168{ 169 hb_codepoint_t u = info.codepoint; 170 unsigned int type = hb_indic_get_categories (u); 171 indic_category_t cat = (indic_category_t) (type & 0x7Fu); 172 indic_position_t pos = (indic_position_t) (type >> 8); 173 174 175 /* 176 * Re-assign category 177 */ 178 179 /* The following act more like the Bindus. */ 180 if (unlikely (hb_in_range (u, 0x0953u, 0x0954u))) 181 cat = OT_SM; 182 /* The following act like consonants. */ 183 else if (unlikely (hb_in_ranges (u, 0x0A72u, 0x0A73u, 184 0x1CF5u, 0x1CF6u))) 185 cat = OT_C; 186 /* TODO: The following should only be allowed after a Visarga. 187 * For now, just treat them like regular tone marks. */ 188 else if (unlikely (hb_in_range (u, 0x1CE2u, 0x1CE8u))) 189 cat = OT_A; 190 /* TODO: The following should only be allowed after some of 191 * the nasalization marks, maybe only for U+1CE9..U+1CF1. 192 * For now, just treat them like tone marks. */ 193 else if (unlikely (u == 0x1CEDu)) 194 cat = OT_A; 195 /* The following take marks in standalone clusters, similar to Avagraha. */ 196 else if (unlikely (hb_in_ranges (u, 0xA8F2u, 0xA8F7u, 197 0x1CE9u, 0x1CECu, 198 0x1CEEu, 0x1CF1u))) 199 { 200 cat = OT_Symbol; 201 ASSERT_STATIC ((int) INDIC_SYLLABIC_CATEGORY_AVAGRAHA == OT_Symbol); 202 } 203 else if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */ 204 else if (unlikely (hb_in_range (u, 0x2010u, 0x2011u))) 205 cat = OT_PLACEHOLDER; 206 else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE; 207 208 209 /* 210 * Re-assign position. 211 */ 212 213 if ((FLAG_SAFE (cat) & CONSONANT_FLAGS)) 214 { 215 pos = POS_BASE_C; 216 if (is_ra (u)) 217 cat = OT_Ra; 218 } 219 else if (cat == OT_M) 220 { 221 pos = matra_position (u, pos); 222 } 223 else if ((FLAG_SAFE (cat) & (FLAG (OT_SM) | FLAG (OT_VD) | FLAG (OT_A) | FLAG (OT_Symbol)))) 224 { 225 pos = POS_SMVD; 226 } 227 228 if (unlikely (u == 0x0B01u)) pos = POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */ 229 230 231 232 info.indic_category() = cat; 233 info.indic_position() = pos; 234} 235 236/* 237 * Things above this line should ideally be moved to the Indic table itself. 238 */ 239 240 241/* 242 * Indic configurations. Note that we do not want to keep every single script-specific 243 * behavior in these tables necessarily. This should mainly be used for per-script 244 * properties that are cheaper keeping here, than in the code. Ie. if, say, one and 245 * only one script has an exception, that one script can be if'ed directly in the code, 246 * instead of adding a new flag in these structs. 247 */ 248 249enum base_position_t { 250 BASE_POS_FIRST, 251 BASE_POS_LAST_SINHALA, 252 BASE_POS_LAST 253}; 254enum reph_position_t { 255 REPH_POS_AFTER_MAIN = POS_AFTER_MAIN, 256 REPH_POS_BEFORE_SUB = POS_BEFORE_SUB, 257 REPH_POS_AFTER_SUB = POS_AFTER_SUB, 258 REPH_POS_BEFORE_POST = POS_BEFORE_POST, 259 REPH_POS_AFTER_POST = POS_AFTER_POST, 260 REPH_POS_DONT_CARE = POS_RA_TO_BECOME_REPH 261}; 262enum reph_mode_t { 263 REPH_MODE_IMPLICIT, /* Reph formed out of initial Ra,H sequence. */ 264 REPH_MODE_EXPLICIT, /* Reph formed out of initial Ra,H,ZWJ sequence. */ 265 REPH_MODE_VIS_REPHA, /* Encoded Repha character, no reordering needed. */ 266 REPH_MODE_LOG_REPHA /* Encoded Repha character, needs reordering. */ 267}; 268enum blwf_mode_t { 269 BLWF_MODE_PRE_AND_POST, /* Below-forms feature applied to pre-base and post-base. */ 270 BLWF_MODE_POST_ONLY /* Below-forms feature applied to post-base only. */ 271}; 272struct indic_config_t 273{ 274 hb_script_t script; 275 bool has_old_spec; 276 hb_codepoint_t virama; 277 base_position_t base_pos; 278 reph_position_t reph_pos; 279 reph_mode_t reph_mode; 280 blwf_mode_t blwf_mode; 281}; 282 283static const indic_config_t indic_configs[] = 284{ 285 /* Default. Should be first. */ 286 {HB_SCRIPT_INVALID, false, 0,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 287 {HB_SCRIPT_DEVANAGARI,true, 0x094Du,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 288 {HB_SCRIPT_BENGALI, true, 0x09CDu,BASE_POS_LAST, REPH_POS_AFTER_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 289 {HB_SCRIPT_GURMUKHI, true, 0x0A4Du,BASE_POS_LAST, REPH_POS_BEFORE_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 290 {HB_SCRIPT_GUJARATI, true, 0x0ACDu,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 291 {HB_SCRIPT_ORIYA, true, 0x0B4Du,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 292 {HB_SCRIPT_TAMIL, true, 0x0BCDu,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST}, 293 {HB_SCRIPT_TELUGU, true, 0x0C4Du,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_EXPLICIT, BLWF_MODE_POST_ONLY}, 294 {HB_SCRIPT_KANNADA, true, 0x0CCDu,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_POST_ONLY}, 295 {HB_SCRIPT_MALAYALAM, true, 0x0D4Du,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_LOG_REPHA,BLWF_MODE_PRE_AND_POST}, 296 {HB_SCRIPT_SINHALA, false,0x0DCAu,BASE_POS_LAST_SINHALA, 297 REPH_POS_AFTER_MAIN, REPH_MODE_EXPLICIT, BLWF_MODE_PRE_AND_POST}, 298 {HB_SCRIPT_KHMER, false,0x17D2u,BASE_POS_FIRST,REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST}, 299}; 300 301 302 303/* 304 * Indic shaper. 305 */ 306 307struct feature_list_t { 308 hb_tag_t tag; 309 hb_ot_map_feature_flags_t flags; 310}; 311 312static const feature_list_t 313indic_features[] = 314{ 315 /* 316 * Basic features. 317 * These features are applied in order, one at a time, after initial_reordering. 318 */ 319 {HB_TAG('n','u','k','t'), F_GLOBAL}, 320 {HB_TAG('a','k','h','n'), F_GLOBAL}, 321 {HB_TAG('r','p','h','f'), F_NONE}, 322 {HB_TAG('r','k','r','f'), F_GLOBAL}, 323 {HB_TAG('p','r','e','f'), F_NONE}, 324 {HB_TAG('b','l','w','f'), F_NONE}, 325 {HB_TAG('a','b','v','f'), F_NONE}, 326 {HB_TAG('h','a','l','f'), F_NONE}, 327 {HB_TAG('p','s','t','f'), F_NONE}, 328 {HB_TAG('v','a','t','u'), F_GLOBAL}, 329 {HB_TAG('c','j','c','t'), F_GLOBAL}, 330 {HB_TAG('c','f','a','r'), F_NONE}, 331 /* 332 * Other features. 333 * These features are applied all at once, after final_reordering. 334 * Default Bengali font in Windows for example has intermixed 335 * lookups for init,pres,abvs,blws features. 336 */ 337 {HB_TAG('i','n','i','t'), F_NONE}, 338 {HB_TAG('p','r','e','s'), F_GLOBAL}, 339 {HB_TAG('a','b','v','s'), F_GLOBAL}, 340 {HB_TAG('b','l','w','s'), F_GLOBAL}, 341 {HB_TAG('p','s','t','s'), F_GLOBAL}, 342 {HB_TAG('h','a','l','n'), F_GLOBAL}, 343 /* Positioning features, though we don't care about the types. */ 344 {HB_TAG('d','i','s','t'), F_GLOBAL}, 345 {HB_TAG('a','b','v','m'), F_GLOBAL}, 346 {HB_TAG('b','l','w','m'), F_GLOBAL}, 347}; 348 349/* 350 * Must be in the same order as the indic_features array. 351 */ 352enum { 353 _NUKT, 354 _AKHN, 355 RPHF, 356 _RKRF, 357 PREF, 358 BLWF, 359 ABVF, 360 HALF, 361 PSTF, 362 _VATU, 363 _CJCT, 364 CFAR, 365 366 INIT, 367 _PRES, 368 _ABVS, 369 _BLWS, 370 _PSTS, 371 _HALN, 372 _DIST, 373 _ABVM, 374 _BLWM, 375 376 INDIC_NUM_FEATURES, 377 INDIC_BASIC_FEATURES = INIT /* Don't forget to update this! */ 378}; 379 380static void 381setup_syllables (const hb_ot_shape_plan_t *plan, 382 hb_font_t *font, 383 hb_buffer_t *buffer); 384static void 385initial_reordering (const hb_ot_shape_plan_t *plan, 386 hb_font_t *font, 387 hb_buffer_t *buffer); 388static void 389final_reordering (const hb_ot_shape_plan_t *plan, 390 hb_font_t *font, 391 hb_buffer_t *buffer); 392static void 393clear_syllables (const hb_ot_shape_plan_t *plan, 394 hb_font_t *font, 395 hb_buffer_t *buffer); 396 397static void 398collect_features_indic (hb_ot_shape_planner_t *plan) 399{ 400 hb_ot_map_builder_t *map = &plan->map; 401 402 /* Do this before any lookups have been applied. */ 403 map->add_gsub_pause (setup_syllables); 404 405 map->add_global_bool_feature (HB_TAG('l','o','c','l')); 406 /* The Indic specs do not require ccmp, but we apply it here since if 407 * there is a use of it, it's typically at the beginning. */ 408 map->add_global_bool_feature (HB_TAG('c','c','m','p')); 409 410 411 unsigned int i = 0; 412 map->add_gsub_pause (initial_reordering); 413 for (; i < INDIC_BASIC_FEATURES; i++) { 414 map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); 415 map->add_gsub_pause (NULL); 416 } 417 map->add_gsub_pause (final_reordering); 418 for (; i < INDIC_NUM_FEATURES; i++) { 419 map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); 420 } 421 422 map->add_global_bool_feature (HB_TAG('c','a','l','t')); 423 map->add_global_bool_feature (HB_TAG('c','l','i','g')); 424 425 map->add_gsub_pause (clear_syllables); 426} 427 428static void 429override_features_indic (hb_ot_shape_planner_t *plan) 430{ 431 /* Uniscribe does not apply 'kern' in Khmer. */ 432 if (hb_options ().uniscribe_bug_compatible) 433 { 434 switch ((hb_tag_t) plan->props.script) 435 { 436 case HB_SCRIPT_KHMER: 437 plan->map.add_feature (HB_TAG('k','e','r','n'), 0, F_GLOBAL); 438 break; 439 } 440 } 441 442 plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL); 443} 444 445 446struct would_substitute_feature_t 447{ 448 inline void init (const hb_ot_map_t *map, hb_tag_t feature_tag, bool zero_context_) 449 { 450 zero_context = zero_context_; 451 map->get_stage_lookups (0/*GSUB*/, 452 map->get_feature_stage (0/*GSUB*/, feature_tag), 453 &lookups, &count); 454 } 455 456 inline bool would_substitute (const hb_codepoint_t *glyphs, 457 unsigned int glyphs_count, 458 hb_face_t *face) const 459 { 460 for (unsigned int i = 0; i < count; i++) 461 if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context)) 462 return true; 463 return false; 464 } 465 466 private: 467 const hb_ot_map_t::lookup_map_t *lookups; 468 unsigned int count; 469 bool zero_context; 470}; 471 472struct indic_shape_plan_t 473{ 474 ASSERT_POD (); 475 476 inline bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const 477 { 478 hb_codepoint_t glyph = virama_glyph; 479 if (unlikely (virama_glyph == (hb_codepoint_t) -1)) 480 { 481 if (!config->virama || !font->get_nominal_glyph (config->virama, &glyph)) 482 glyph = 0; 483 /* Technically speaking, the spec says we should apply 'locl' to virama too. 484 * Maybe one day... */ 485 486 /* Our get_nominal_glyph() function needs a font, so we can't get the virama glyph 487 * during shape planning... Instead, overwrite it here. It's safe. Don't worry! */ 488 (const_cast<indic_shape_plan_t *> (this))->virama_glyph = glyph; 489 } 490 491 *pglyph = glyph; 492 return glyph != 0; 493 } 494 495 const indic_config_t *config; 496 497 bool is_old_spec; 498 hb_codepoint_t virama_glyph; 499 500 would_substitute_feature_t rphf; 501 would_substitute_feature_t pref; 502 would_substitute_feature_t blwf; 503 would_substitute_feature_t pstf; 504 505 hb_mask_t mask_array[INDIC_NUM_FEATURES]; 506}; 507 508static void * 509data_create_indic (const hb_ot_shape_plan_t *plan) 510{ 511 indic_shape_plan_t *indic_plan = (indic_shape_plan_t *) calloc (1, sizeof (indic_shape_plan_t)); 512 if (unlikely (!indic_plan)) 513 return NULL; 514 515 indic_plan->config = &indic_configs[0]; 516 for (unsigned int i = 1; i < ARRAY_LENGTH (indic_configs); i++) 517 if (plan->props.script == indic_configs[i].script) { 518 indic_plan->config = &indic_configs[i]; 519 break; 520 } 521 522 indic_plan->is_old_spec = indic_plan->config->has_old_spec && ((plan->map.chosen_script[0] & 0x000000FFu) != '2'); 523 indic_plan->virama_glyph = (hb_codepoint_t) -1; 524 525 /* Use zero-context would_substitute() matching for new-spec of the main 526 * Indic scripts, and scripts with one spec only, but not for old-specs. 527 * The new-spec for all dual-spec scripts says zero-context matching happens. 528 * 529 * However, testing with Malayalam shows that old and new spec both allow 530 * context. Testing with Bengali new-spec however shows that it doesn't. 531 * So, the heuristic here is the way it is. It should *only* be changed, 532 * as we discover more cases of what Windows does. DON'T TOUCH OTHERWISE. 533 */ 534 bool zero_context = !indic_plan->is_old_spec && plan->props.script != HB_SCRIPT_MALAYALAM; 535 indic_plan->rphf.init (&plan->map, HB_TAG('r','p','h','f'), zero_context); 536 indic_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), zero_context); 537 indic_plan->blwf.init (&plan->map, HB_TAG('b','l','w','f'), zero_context); 538 indic_plan->pstf.init (&plan->map, HB_TAG('p','s','t','f'), zero_context); 539 540 for (unsigned int i = 0; i < ARRAY_LENGTH (indic_plan->mask_array); i++) 541 indic_plan->mask_array[i] = (indic_features[i].flags & F_GLOBAL) ? 542 0 : plan->map.get_1_mask (indic_features[i].tag); 543 544 return indic_plan; 545} 546 547static void 548data_destroy_indic (void *data) 549{ 550 free (data); 551} 552 553static indic_position_t 554consonant_position_from_face (const indic_shape_plan_t *indic_plan, 555 const hb_codepoint_t consonant, 556 const hb_codepoint_t virama, 557 hb_face_t *face) 558{ 559 /* For old-spec, the order of glyphs is Consonant,Virama, 560 * whereas for new-spec, it's Virama,Consonant. However, 561 * some broken fonts (like Free Sans) simply copied lookups 562 * from old-spec to new-spec without modification. 563 * And oddly enough, Uniscribe seems to respect those lookups. 564 * Eg. in the sequence U+0924,U+094D,U+0930, Uniscribe finds 565 * base at 0. The font however, only has lookups matching 566 * 930,94D in 'blwf', not the expected 94D,930 (with new-spec 567 * table). As such, we simply match both sequences. Seems 568 * to work. */ 569 hb_codepoint_t glyphs[3] = {virama, consonant, virama}; 570 if (indic_plan->blwf.would_substitute (glyphs , 2, face) || 571 indic_plan->blwf.would_substitute (glyphs+1, 2, face)) 572 return POS_BELOW_C; 573 if (indic_plan->pstf.would_substitute (glyphs , 2, face) || 574 indic_plan->pstf.would_substitute (glyphs+1, 2, face)) 575 return POS_POST_C; 576 if (indic_plan->pref.would_substitute (glyphs , 2, face) || 577 indic_plan->pref.would_substitute (glyphs+1, 2, face)) 578 return POS_POST_C; 579 return POS_BASE_C; 580} 581 582 583enum syllable_type_t { 584 consonant_syllable, 585 vowel_syllable, 586 standalone_cluster, 587 symbol_cluster, 588 broken_cluster, 589 non_indic_cluster, 590}; 591 592#include "hb-ot-shape-complex-indic-machine.hh" 593 594 595static void 596setup_masks_indic (const hb_ot_shape_plan_t *plan HB_UNUSED, 597 hb_buffer_t *buffer, 598 hb_font_t *font HB_UNUSED) 599{ 600 HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 601 HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 602 603 /* We cannot setup masks here. We save information about characters 604 * and setup masks later on in a pause-callback. */ 605 606 unsigned int count = buffer->len; 607 hb_glyph_info_t *info = buffer->info; 608 for (unsigned int i = 0; i < count; i++) 609 set_indic_properties (info[i]); 610} 611 612static void 613setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, 614 hb_font_t *font HB_UNUSED, 615 hb_buffer_t *buffer) 616{ 617 find_syllables (buffer); 618} 619 620static int 621compare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 622{ 623 int a = pa->indic_position(); 624 int b = pb->indic_position(); 625 626 return a < b ? -1 : a == b ? 0 : +1; 627} 628 629 630 631static void 632update_consonant_positions (const hb_ot_shape_plan_t *plan, 633 hb_font_t *font, 634 hb_buffer_t *buffer) 635{ 636 const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 637 638 if (indic_plan->config->base_pos != BASE_POS_LAST) 639 return; 640 641 hb_codepoint_t virama; 642 if (indic_plan->get_virama_glyph (font, &virama)) 643 { 644 hb_face_t *face = font->face; 645 unsigned int count = buffer->len; 646 hb_glyph_info_t *info = buffer->info; 647 for (unsigned int i = 0; i < count; i++) 648 if (info[i].indic_position() == POS_BASE_C) 649 { 650 hb_codepoint_t consonant = info[i].codepoint; 651 info[i].indic_position() = consonant_position_from_face (indic_plan, consonant, virama, face); 652 } 653 } 654} 655 656 657/* Rules from: 658 * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 659 660static void 661initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, 662 hb_face_t *face, 663 hb_buffer_t *buffer, 664 unsigned int start, unsigned int end) 665{ 666 const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 667 hb_glyph_info_t *info = buffer->info; 668 669 670 /* 1. Find base consonant: 671 * 672 * The shaping engine finds the base consonant of the syllable, using the 673 * following algorithm: starting from the end of the syllable, move backwards 674 * until a consonant is found that does not have a below-base or post-base 675 * form (post-base forms have to follow below-base forms), or that is not a 676 * pre-base reordering Ra, or arrive at the first consonant. The consonant 677 * stopped at will be the base. 678 * 679 * o If the syllable starts with Ra + Halant (in a script that has Reph) 680 * and has more than one consonant, Ra is excluded from candidates for 681 * base consonants. 682 */ 683 684 unsigned int base = end; 685 bool has_reph = false; 686 687 { 688 /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 689 * and has more than one consonant, Ra is excluded from candidates for 690 * base consonants. */ 691 unsigned int limit = start; 692 if (indic_plan->config->reph_pos != REPH_POS_DONT_CARE && 693 indic_plan->mask_array[RPHF] && 694 start + 3 <= end && 695 ( 696 (indic_plan->config->reph_mode == REPH_MODE_IMPLICIT && !is_joiner (info[start + 2])) || 697 (indic_plan->config->reph_mode == REPH_MODE_EXPLICIT && info[start + 2].indic_category() == OT_ZWJ) 698 )) 699 { 700 /* See if it matches the 'rphf' feature. */ 701 hb_codepoint_t glyphs[3] = {info[start].codepoint, 702 info[start + 1].codepoint, 703 indic_plan->config->reph_mode == REPH_MODE_EXPLICIT ? 704 info[start + 2].codepoint : 0}; 705 if (indic_plan->rphf.would_substitute (glyphs, 2, face) || 706 (indic_plan->config->reph_mode == REPH_MODE_EXPLICIT && 707 indic_plan->rphf.would_substitute (glyphs, 3, face))) 708 { 709 limit += 2; 710 while (limit < end && is_joiner (info[limit])) 711 limit++; 712 base = start; 713 has_reph = true; 714 } 715 } else if (indic_plan->config->reph_mode == REPH_MODE_LOG_REPHA && info[start].indic_category() == OT_Repha) 716 { 717 limit += 1; 718 while (limit < end && is_joiner (info[limit])) 719 limit++; 720 base = start; 721 has_reph = true; 722 } 723 724 switch (indic_plan->config->base_pos) 725 { 726 case BASE_POS_LAST: 727 { 728 /* -> starting from the end of the syllable, move backwards */ 729 unsigned int i = end; 730 bool seen_below = false; 731 do { 732 i--; 733 /* -> until a consonant is found */ 734 if (is_consonant (info[i])) 735 { 736 /* -> that does not have a below-base or post-base form 737 * (post-base forms have to follow below-base forms), */ 738 if (info[i].indic_position() != POS_BELOW_C && 739 (info[i].indic_position() != POS_POST_C || seen_below)) 740 { 741 base = i; 742 break; 743 } 744 if (info[i].indic_position() == POS_BELOW_C) 745 seen_below = true; 746 747 /* -> or that is not a pre-base reordering Ra, 748 * 749 * IMPLEMENTATION NOTES: 750 * 751 * Our pre-base reordering Ra's are marked POS_POST_C, so will be skipped 752 * by the logic above already. 753 */ 754 755 /* -> or arrive at the first consonant. The consonant stopped at will 756 * be the base. */ 757 base = i; 758 } 759 else 760 { 761 /* A ZWJ after a Halant stops the base search, and requests an explicit 762 * half form. 763 * A ZWJ before a Halant, requests a subjoined form instead, and hence 764 * search continues. This is particularly important for Bengali 765 * sequence Ra,H,Ya that should form Ya-Phalaa by subjoining Ya. */ 766 if (start < i && 767 info[i].indic_category() == OT_ZWJ && 768 info[i - 1].indic_category() == OT_H) 769 break; 770 } 771 } while (i > limit); 772 } 773 break; 774 775 case BASE_POS_LAST_SINHALA: 776 { 777 /* Sinhala base positioning is slightly different from main Indic, in that: 778 * 1. Its ZWJ behavior is different, 779 * 2. We don't need to look into the font for consonant positions. 780 */ 781 782 if (!has_reph) 783 base = limit; 784 785 /* Find the last base consonant that is not blocked by ZWJ. If there is 786 * a ZWJ right before a base consonant, that would request a subjoined form. */ 787 for (unsigned int i = limit; i < end; i++) 788 if (is_consonant (info[i])) 789 { 790 if (limit < i && info[i - 1].indic_category() == OT_ZWJ) 791 break; 792 else 793 base = i; 794 } 795 796 /* Mark all subsequent consonants as below. */ 797 for (unsigned int i = base + 1; i < end; i++) 798 if (is_consonant (info[i])) 799 info[i].indic_position() = POS_BELOW_C; 800 } 801 break; 802 803 case BASE_POS_FIRST: 804 { 805 /* The first consonant is always the base. */ 806 807 assert (indic_plan->config->reph_mode == REPH_MODE_VIS_REPHA); 808 assert (!has_reph); 809 810 base = start; 811 812 /* Mark all subsequent consonants as below. */ 813 for (unsigned int i = base + 1; i < end; i++) 814 if (is_consonant (info[i])) 815 info[i].indic_position() = POS_BELOW_C; 816 } 817 break; 818 } 819 820 /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 821 * and has more than one consonant, Ra is excluded from candidates for 822 * base consonants. 823 * 824 * Only do this for unforced Reph. (ie. not for Ra,H,ZWJ. */ 825 if (has_reph && base == start && limit - base <= 2) { 826 /* Have no other consonant, so Reph is not formed and Ra becomes base. */ 827 has_reph = false; 828 } 829 } 830 831 832 /* 2. Decompose and reorder Matras: 833 * 834 * Each matra and any syllable modifier sign in the cluster are moved to the 835 * appropriate position relative to the consonant(s) in the cluster. The 836 * shaping engine decomposes two- or three-part matras into their constituent 837 * parts before any repositioning. Matra characters are classified by which 838 * consonant in a conjunct they have affinity for and are reordered to the 839 * following positions: 840 * 841 * o Before first half form in the syllable 842 * o After subjoined consonants 843 * o After post-form consonant 844 * o After main consonant (for above marks) 845 * 846 * IMPLEMENTATION NOTES: 847 * 848 * The normalize() routine has already decomposed matras for us, so we don't 849 * need to worry about that. 850 */ 851 852 853 /* 3. Reorder marks to canonical order: 854 * 855 * Adjacent nukta and halant or nukta and vedic sign are always repositioned 856 * if necessary, so that the nukta is first. 857 * 858 * IMPLEMENTATION NOTES: 859 * 860 * We don't need to do this: the normalize() routine already did this for us. 861 */ 862 863 864 /* Reorder characters */ 865 866 for (unsigned int i = start; i < base; i++) 867 info[i].indic_position() = MIN (POS_PRE_C, (indic_position_t) info[i].indic_position()); 868 869 if (base < end) 870 info[base].indic_position() = POS_BASE_C; 871 872 /* Mark final consonants. A final consonant is one appearing after a matra, 873 * like in Khmer. */ 874 for (unsigned int i = base + 1; i < end; i++) 875 if (info[i].indic_category() == OT_M) { 876 for (unsigned int j = i + 1; j < end; j++) 877 if (is_consonant (info[j])) { 878 info[j].indic_position() = POS_FINAL_C; 879 break; 880 } 881 break; 882 } 883 884 /* Handle beginning Ra */ 885 if (has_reph) 886 info[start].indic_position() = POS_RA_TO_BECOME_REPH; 887 888 /* For old-style Indic script tags, move the first post-base Halant after 889 * last consonant. 890 * 891 * Reports suggest that in some scripts Uniscribe does this only if there 892 * is *not* a Halant after last consonant already (eg. Kannada), while it 893 * does it unconditionally in other scripts (eg. Malayalam). We don't 894 * currently know about other scripts, so we single out Malayalam for now. 895 * 896 * Kannada test case: 897 * U+0C9A,U+0CCD,U+0C9A,U+0CCD 898 * With some versions of Lohit Kannada. 899 * https://bugs.freedesktop.org/show_bug.cgi?id=59118 900 * 901 * Malayalam test case: 902 * U+0D38,U+0D4D,U+0D31,U+0D4D,U+0D31,U+0D4D 903 * With lohit-ttf-20121122/Lohit-Malayalam.ttf 904 */ 905 if (indic_plan->is_old_spec) 906 { 907 bool disallow_double_halants = buffer->props.script != HB_SCRIPT_MALAYALAM; 908 for (unsigned int i = base + 1; i < end; i++) 909 if (info[i].indic_category() == OT_H) 910 { 911 unsigned int j; 912 for (j = end - 1; j > i; j--) 913 if (is_consonant (info[j]) || 914 (disallow_double_halants && info[j].indic_category() == OT_H)) 915 break; 916 if (info[j].indic_category() != OT_H && j > i) { 917 /* Move Halant to after last consonant. */ 918 hb_glyph_info_t t = info[i]; 919 memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 920 info[j] = t; 921 } 922 break; 923 } 924 } 925 926 /* Attach misc marks to previous char to move with them. */ 927 { 928 indic_position_t last_pos = POS_START; 929 for (unsigned int i = start; i < end; i++) 930 { 931 if ((FLAG_SAFE (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | MEDIAL_FLAGS | HALANT_OR_COENG_FLAGS))) 932 { 933 info[i].indic_position() = last_pos; 934 if (unlikely (info[i].indic_category() == OT_H && 935 info[i].indic_position() == POS_PRE_M)) 936 { 937 /* 938 * Uniscribe doesn't move the Halant with Left Matra. 939 * TEST: U+092B,U+093F,U+094DE 940 * We follow. This is important for the Sinhala 941 * U+0DDA split matra since it decomposes to U+0DD9,U+0DCA 942 * where U+0DD9 is a left matra and U+0DCA is the virama. 943 * We don't want to move the virama with the left matra. 944 * TEST: U+0D9A,U+0DDA 945 */ 946 for (unsigned int j = i; j > start; j--) 947 if (info[j - 1].indic_position() != POS_PRE_M) { 948 info[i].indic_position() = info[j - 1].indic_position(); 949 break; 950 } 951 } 952 } else if (info[i].indic_position() != POS_SMVD) { 953 last_pos = (indic_position_t) info[i].indic_position(); 954 } 955 } 956 } 957 /* For post-base consonants let them own anything before them 958 * since the last consonant or matra. */ 959 { 960 unsigned int last = base; 961 for (unsigned int i = base + 1; i < end; i++) 962 if (is_consonant (info[i])) 963 { 964 for (unsigned int j = last + 1; j < i; j++) 965 if (info[j].indic_position() < POS_SMVD) 966 info[j].indic_position() = info[i].indic_position(); 967 last = i; 968 } else if (info[i].indic_category() == OT_M) 969 last = i; 970 } 971 972 973 { 974 /* Use syllable() for sort accounting temporarily. */ 975 unsigned int syllable = info[start].syllable(); 976 for (unsigned int i = start; i < end; i++) 977 info[i].syllable() = i - start; 978 979 /* Sit tight, rock 'n roll! */ 980 hb_stable_sort (info + start, end - start, compare_indic_order); 981 /* Find base again */ 982 base = end; 983 for (unsigned int i = start; i < end; i++) 984 if (info[i].indic_position() == POS_BASE_C) 985 { 986 base = i; 987 break; 988 } 989 /* Things are out-of-control for post base positions, they may shuffle 990 * around like crazy. In old-spec mode, we move halants around, so in 991 * that case merge all clusters after base. Otherwise, check the sort 992 * order and merge as needed. 993 * For pre-base stuff, we handle cluster issues in final reordering. 994 * 995 * We could use buffer->sort() for this, if there was no special 996 * reordering of pre-base stuff happening later... 997 */ 998 if (indic_plan->is_old_spec || end - base > 127) 999 buffer->merge_clusters (base, end); 1000 else 1001 { 1002 /* Note! syllable() is a one-byte field. */ 1003 for (unsigned int i = base; i < end; i++) 1004 if (info[i].syllable() != 255) 1005 { 1006 unsigned int max = i; 1007 unsigned int j = start + info[i].syllable(); 1008 while (j != i) 1009 { 1010 max = MAX (max, j); 1011 unsigned int next = start + info[j].syllable(); 1012 info[j].syllable() = 255; /* So we don't process j later again. */ 1013 j = next; 1014 } 1015 if (i != max) 1016 buffer->merge_clusters (i, max + 1); 1017 } 1018 } 1019 1020 /* Put syllable back in. */ 1021 for (unsigned int i = start; i < end; i++) 1022 info[i].syllable() = syllable; 1023 } 1024 1025 /* Setup masks now */ 1026 1027 { 1028 hb_mask_t mask; 1029 1030 /* Reph */ 1031 for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 1032 info[i].mask |= indic_plan->mask_array[RPHF]; 1033 1034 /* Pre-base */ 1035 mask = indic_plan->mask_array[HALF]; 1036 if (!indic_plan->is_old_spec && 1037 indic_plan->config->blwf_mode == BLWF_MODE_PRE_AND_POST) 1038 mask |= indic_plan->mask_array[BLWF]; 1039 for (unsigned int i = start; i < base; i++) 1040 info[i].mask |= mask; 1041 /* Base */ 1042 mask = 0; 1043 if (base < end) 1044 info[base].mask |= mask; 1045 /* Post-base */ 1046 mask = indic_plan->mask_array[BLWF] | indic_plan->mask_array[ABVF] | indic_plan->mask_array[PSTF]; 1047 for (unsigned int i = base + 1; i < end; i++) 1048 info[i].mask |= mask; 1049 } 1050 1051 if (indic_plan->is_old_spec && 1052 buffer->props.script == HB_SCRIPT_DEVANAGARI) 1053 { 1054 /* Old-spec eye-lash Ra needs special handling. From the 1055 * spec: 1056 * 1057 * "The feature 'below-base form' is applied to consonants 1058 * having below-base forms and following the base consonant. 1059 * The exception is vattu, which may appear below half forms 1060 * as well as below the base glyph. The feature 'below-base 1061 * form' will be applied to all such occurrences of Ra as well." 1062 * 1063 * Test case: U+0924,U+094D,U+0930,U+094d,U+0915 1064 * with Sanskrit 2003 font. 1065 * 1066 * However, note that Ra,Halant,ZWJ is the correct way to 1067 * request eyelash form of Ra, so we wouldbn't inhibit it 1068 * in that sequence. 1069 * 1070 * Test case: U+0924,U+094D,U+0930,U+094d,U+200D,U+0915 1071 */ 1072 for (unsigned int i = start; i + 1 < base; i++) 1073 if (info[i ].indic_category() == OT_Ra && 1074 info[i+1].indic_category() == OT_H && 1075 (i + 2 == base || 1076 info[i+2].indic_category() != OT_ZWJ)) 1077 { 1078 info[i ].mask |= indic_plan->mask_array[BLWF]; 1079 info[i+1].mask |= indic_plan->mask_array[BLWF]; 1080 } 1081 } 1082 1083 unsigned int pref_len = 2; 1084 if (indic_plan->mask_array[PREF] && base + pref_len < end) 1085 { 1086 /* Find a Halant,Ra sequence and mark it for pre-base reordering processing. */ 1087 for (unsigned int i = base + 1; i + pref_len - 1 < end; i++) { 1088 hb_codepoint_t glyphs[2]; 1089 for (unsigned int j = 0; j < pref_len; j++) 1090 glyphs[j] = info[i + j].codepoint; 1091 if (indic_plan->pref.would_substitute (glyphs, pref_len, face)) 1092 { 1093 for (unsigned int j = 0; j < pref_len; j++) 1094 info[i++].mask |= indic_plan->mask_array[PREF]; 1095 1096 /* Mark the subsequent stuff with 'cfar'. Used in Khmer. 1097 * Read the feature spec. 1098 * This allows distinguishing the following cases with MS Khmer fonts: 1099 * U+1784,U+17D2,U+179A,U+17D2,U+1782 1100 * U+1784,U+17D2,U+1782,U+17D2,U+179A 1101 */ 1102 if (indic_plan->mask_array[CFAR]) 1103 for (; i < end; i++) 1104 info[i].mask |= indic_plan->mask_array[CFAR]; 1105 1106 break; 1107 } 1108 } 1109 } 1110 1111 /* Apply ZWJ/ZWNJ effects */ 1112 for (unsigned int i = start + 1; i < end; i++) 1113 if (is_joiner (info[i])) { 1114 bool non_joiner = info[i].indic_category() == OT_ZWNJ; 1115 unsigned int j = i; 1116 1117 do { 1118 j--; 1119 1120 /* ZWJ/ZWNJ should disable CJCT. They do that by simply 1121 * being there, since we don't skip them for the CJCT 1122 * feature (ie. F_MANUAL_ZWJ) */ 1123 1124 /* A ZWNJ disables HALF. */ 1125 if (non_joiner) 1126 info[j].mask &= ~indic_plan->mask_array[HALF]; 1127 1128 } while (j > start && !is_consonant (info[j])); 1129 } 1130} 1131 1132static void 1133initial_reordering_standalone_cluster (const hb_ot_shape_plan_t *plan, 1134 hb_face_t *face, 1135 hb_buffer_t *buffer, 1136 unsigned int start, unsigned int end) 1137{ 1138 /* We treat placeholder/dotted-circle as if they are consonants, so we 1139 * should just chain. Only if not in compatibility mode that is... */ 1140 1141 if (hb_options ().uniscribe_bug_compatible) 1142 { 1143 /* For dotted-circle, this is what Uniscribe does: 1144 * If dotted-circle is the last glyph, it just does nothing. 1145 * Ie. It doesn't form Reph. */ 1146 if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 1147 return; 1148 } 1149 1150 initial_reordering_consonant_syllable (plan, face, buffer, start, end); 1151} 1152 1153static void 1154initial_reordering_syllable (const hb_ot_shape_plan_t *plan, 1155 hb_face_t *face, 1156 hb_buffer_t *buffer, 1157 unsigned int start, unsigned int end) 1158{ 1159 syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); 1160 switch (syllable_type) 1161 { 1162 case vowel_syllable: /* We made the vowels look like consonants. So let's call the consonant logic! */ 1163 case consonant_syllable: 1164 initial_reordering_consonant_syllable (plan, face, buffer, start, end); 1165 break; 1166 1167 case broken_cluster: /* We already inserted dotted-circles, so just call the standalone_cluster. */ 1168 case standalone_cluster: 1169 initial_reordering_standalone_cluster (plan, face, buffer, start, end); 1170 break; 1171 1172 case symbol_cluster: 1173 case non_indic_cluster: 1174 break; 1175 } 1176} 1177 1178static inline void 1179insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, 1180 hb_font_t *font, 1181 hb_buffer_t *buffer) 1182{ 1183 /* Note: This loop is extra overhead, but should not be measurable. */ 1184 bool has_broken_syllables = false; 1185 unsigned int count = buffer->len; 1186 hb_glyph_info_t *info = buffer->info; 1187 for (unsigned int i = 0; i < count; i++) 1188 if ((info[i].syllable() & 0x0F) == broken_cluster) 1189 { 1190 has_broken_syllables = true; 1191 break; 1192 } 1193 if (likely (!has_broken_syllables)) 1194 return; 1195 1196 1197 hb_codepoint_t dottedcircle_glyph; 1198 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph)) 1199 return; 1200 1201 hb_glyph_info_t dottedcircle = {0}; 1202 dottedcircle.codepoint = 0x25CCu; 1203 set_indic_properties (dottedcircle); 1204 dottedcircle.codepoint = dottedcircle_glyph; 1205 1206 buffer->clear_output (); 1207 1208 buffer->idx = 0; 1209 unsigned int last_syllable = 0; 1210 while (buffer->idx < buffer->len && !buffer->in_error) 1211 { 1212 unsigned int syllable = buffer->cur().syllable(); 1213 syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); 1214 if (unlikely (last_syllable != syllable && syllable_type == broken_cluster)) 1215 { 1216 last_syllable = syllable; 1217 1218 hb_glyph_info_t ginfo = dottedcircle; 1219 ginfo.cluster = buffer->cur().cluster; 1220 ginfo.mask = buffer->cur().mask; 1221 ginfo.syllable() = buffer->cur().syllable(); 1222 /* TODO Set glyph_props? */ 1223 1224 /* Insert dottedcircle after possible Repha. */ 1225 while (buffer->idx < buffer->len && !buffer->in_error && 1226 last_syllable == buffer->cur().syllable() && 1227 buffer->cur().indic_category() == OT_Repha) 1228 buffer->next_glyph (); 1229 1230 buffer->output_info (ginfo); 1231 } 1232 else 1233 buffer->next_glyph (); 1234 } 1235 1236 buffer->swap_buffers (); 1237} 1238 1239static void 1240initial_reordering (const hb_ot_shape_plan_t *plan, 1241 hb_font_t *font, 1242 hb_buffer_t *buffer) 1243{ 1244 update_consonant_positions (plan, font, buffer); 1245 insert_dotted_circles (plan, font, buffer); 1246 1247 foreach_syllable (buffer, start, end) 1248 initial_reordering_syllable (plan, font->face, buffer, start, end); 1249} 1250 1251static void 1252final_reordering_syllable (const hb_ot_shape_plan_t *plan, 1253 hb_buffer_t *buffer, 1254 unsigned int start, unsigned int end) 1255{ 1256 const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 1257 hb_glyph_info_t *info = buffer->info; 1258 1259 1260 /* This function relies heavily on halant glyphs. Lots of ligation 1261 * and possibly multiplication substitutions happened prior to this 1262 * phase, and that might have messed up our properties. Recover 1263 * from a particular case of that where we're fairly sure that a 1264 * class of OT_H is desired but has been lost. */ 1265 if (indic_plan->virama_glyph) 1266 { 1267 unsigned int virama_glyph = indic_plan->virama_glyph; 1268 for (unsigned int i = start; i < end; i++) 1269 if (info[i].codepoint == virama_glyph && 1270 _hb_glyph_info_ligated (&info[i]) && 1271 _hb_glyph_info_multiplied (&info[i])) 1272 { 1273 /* This will make sure that this glyph passes is_halant_or_coeng() test. */ 1274 info[i].indic_category() = OT_H; 1275 _hb_glyph_info_clear_ligated_and_multiplied (&info[i]); 1276 } 1277 } 1278 1279 1280 /* 4. Final reordering: 1281 * 1282 * After the localized forms and basic shaping forms GSUB features have been 1283 * applied (see below), the shaping engine performs some final glyph 1284 * reordering before applying all the remaining font features to the entire 1285 * cluster. 1286 */ 1287 1288 bool try_pref = !!indic_plan->mask_array[PREF]; 1289 1290 /* Find base again */ 1291 unsigned int base; 1292 for (base = start; base < end; base++) 1293 if (info[base].indic_position() >= POS_BASE_C) 1294 { 1295 if (try_pref && base + 1 < end) 1296 { 1297 for (unsigned int i = base + 1; i < end; i++) 1298 if ((info[i].mask & indic_plan->mask_array[PREF]) != 0) 1299 { 1300 if (!(_hb_glyph_info_substituted (&info[i]) && 1301 _hb_glyph_info_ligated_and_didnt_multiply (&info[i]))) 1302 { 1303 /* Ok, this was a 'pref' candidate but didn't form any. 1304 * Base is around here... */ 1305 base = i; 1306 while (base < end && is_halant_or_coeng (info[base])) 1307 base++; 1308 info[base].indic_position() = POS_BASE_C; 1309 1310 try_pref = false; 1311 } 1312 break; 1313 } 1314 } 1315 /* For Malayalam, skip over unformed below- (but NOT post-) forms. */ 1316 if (buffer->props.script == HB_SCRIPT_MALAYALAM) 1317 { 1318 for (unsigned int i = base + 1; i < end; i++) 1319 { 1320 while (i < end && is_joiner (info[i])) 1321 i++; 1322 if (i == end || !is_halant_or_coeng (info[i])) 1323 break; 1324 i++; /* Skip halant. */ 1325 while (i < end && is_joiner (info[i])) 1326 i++; 1327 if (i < end && is_consonant (info[i]) && info[i].indic_position() == POS_BELOW_C) 1328 { 1329 base = i; 1330 info[base].indic_position() = POS_BASE_C; 1331 } 1332 } 1333 } 1334 1335 if (start < base && info[base].indic_position() > POS_BASE_C) 1336 base--; 1337 break; 1338 } 1339 if (base == end && start < base && 1340 is_one_of (info[base - 1], FLAG (OT_ZWJ))) 1341 base--; 1342 if (base < end) 1343 while (start < base && 1344 is_one_of (info[base], (FLAG (OT_N) | HALANT_OR_COENG_FLAGS))) 1345 base--; 1346 1347 1348 /* o Reorder matras: 1349 * 1350 * If a pre-base matra character had been reordered before applying basic 1351 * features, the glyph can be moved closer to the main consonant based on 1352 * whether half-forms had been formed. Actual position for the matra is 1353 * defined as ���after last standalone halant glyph, after initial matra 1354 * position and before the main consonant���. If ZWJ or ZWNJ follow this 1355 * halant, position is moved after it. 1356 */ 1357 1358 if (start + 1 < end && start < base) /* Otherwise there can't be any pre-base matra characters. */ 1359 { 1360 /* If we lost track of base, alas, position before last thingy. */ 1361 unsigned int new_pos = base == end ? base - 2 : base - 1; 1362 1363 /* Malayalam / Tamil do not have "half" forms or explicit virama forms. 1364 * The glyphs formed by 'half' are Chillus or ligated explicit viramas. 1365 * We want to position matra after them. 1366 */ 1367 if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) 1368 { 1369 while (new_pos > start && 1370 !(is_one_of (info[new_pos], (FLAG (OT_M) | HALANT_OR_COENG_FLAGS)))) 1371 new_pos--; 1372 1373 /* If we found no Halant we are done. 1374 * Otherwise only proceed if the Halant does 1375 * not belong to the Matra itself! */ 1376 if (is_halant_or_coeng (info[new_pos]) && 1377 info[new_pos].indic_position() != POS_PRE_M) 1378 { 1379 /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 1380 if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) 1381 new_pos++; 1382 } 1383 else 1384 new_pos = start; /* No move. */ 1385 } 1386 1387 if (start < new_pos && info[new_pos].indic_position () != POS_PRE_M) 1388 { 1389 /* Now go see if there's actually any matras... */ 1390 for (unsigned int i = new_pos; i > start; i--) 1391 if (info[i - 1].indic_position () == POS_PRE_M) 1392 { 1393 unsigned int old_pos = i - 1; 1394 if (old_pos < base && base <= new_pos) /* Shouldn't actually happen. */ 1395 base--; 1396 1397 hb_glyph_info_t tmp = info[old_pos]; 1398 memmove (&info[old_pos], &info[old_pos + 1], (new_pos - old_pos) * sizeof (info[0])); 1399 info[new_pos] = tmp; 1400 1401 /* Note: this merge_clusters() is intentionally *after* the reordering. 1402 * Indic matra reordering is special and tricky... */ 1403 buffer->merge_clusters (new_pos, MIN (end, base + 1)); 1404 1405 new_pos--; 1406 } 1407 } else { 1408 for (unsigned int i = start; i < base; i++) 1409 if (info[i].indic_position () == POS_PRE_M) { 1410 buffer->merge_clusters (i, MIN (end, base + 1)); 1411 break; 1412 } 1413 } 1414 } 1415 1416 1417 /* o Reorder reph: 1418 * 1419 * Reph���s original position is always at the beginning of the syllable, 1420 * (i.e. it is not reordered at the character reordering stage). However, 1421 * it will be reordered according to the basic-forms shaping results. 1422 * Possible positions for reph, depending on the script, are; after main, 1423 * before post-base consonant forms, and after post-base consonant forms. 1424 */ 1425 1426 /* Two cases: 1427 * 1428 * - If repha is encoded as a sequence of characters (Ra,H or Ra,H,ZWJ), then 1429 * we should only move it if the sequence ligated to the repha form. 1430 * 1431 * - If repha is encoded separately and in the logical position, we should only 1432 * move it if it did NOT ligate. If it ligated, it's probably the font trying 1433 * to make it work without the reordering. 1434 */ 1435 if (start + 1 < end && 1436 info[start].indic_position() == POS_RA_TO_BECOME_REPH && 1437 ((info[start].indic_category() == OT_Repha) ^ 1438 _hb_glyph_info_ligated_and_didnt_multiply (&info[start]))) 1439 { 1440 unsigned int new_reph_pos; 1441 reph_position_t reph_pos = indic_plan->config->reph_pos; 1442 1443 assert (reph_pos != REPH_POS_DONT_CARE); 1444 1445 /* 1. If reph should be positioned after post-base consonant forms, 1446 * proceed to step 5. 1447 */ 1448 if (reph_pos == REPH_POS_AFTER_POST) 1449 { 1450 goto reph_step_5; 1451 } 1452 1453 /* 2. If the reph repositioning class is not after post-base: target 1454 * position is after the first explicit halant glyph between the 1455 * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 1456 * are following this halant, position is moved after it. If such 1457 * position is found, this is the target position. Otherwise, 1458 * proceed to the next step. 1459 * 1460 * Note: in old-implementation fonts, where classifications were 1461 * fixed in shaping engine, there was no case where reph position 1462 * will be found on this step. 1463 */ 1464 { 1465 new_reph_pos = start + 1; 1466 while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 1467 new_reph_pos++; 1468 1469 if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) 1470 { 1471 /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 1472 if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 1473 new_reph_pos++; 1474 goto reph_move; 1475 } 1476 } 1477 1478 /* 3. If reph should be repositioned after the main consonant: find the 1479 * first consonant not ligated with main, or find the first 1480 * consonant that is not a potential pre-base reordering Ra. 1481 */ 1482 if (reph_pos == REPH_POS_AFTER_MAIN) 1483 { 1484 new_reph_pos = base; 1485 while (new_reph_pos + 1 < end && info[new_reph_pos + 1].indic_position() <= POS_AFTER_MAIN) 1486 new_reph_pos++; 1487 if (new_reph_pos < end) 1488 goto reph_move; 1489 } 1490 1491 /* 4. If reph should be positioned before post-base consonant, find 1492 * first post-base classified consonant not ligated with main. If no 1493 * consonant is found, the target position should be before the 1494 * first matra, syllable modifier sign or vedic sign. 1495 */ 1496 /* This is our take on what step 4 is trying to say (and failing, BADLY). */ 1497 if (reph_pos == REPH_POS_AFTER_SUB) 1498 { 1499 new_reph_pos = base; 1500 while (new_reph_pos < end && 1501 !( FLAG_SAFE (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD)))) 1502 new_reph_pos++; 1503 if (new_reph_pos < end) 1504 goto reph_move; 1505 } 1506 1507 /* 5. If no consonant is found in steps 3 or 4, move reph to a position 1508 * immediately before the first post-base matra, syllable modifier 1509 * sign or vedic sign that has a reordering class after the intended 1510 * reph position. For example, if the reordering position for reph 1511 * is post-main, it will skip above-base matras that also have a 1512 * post-main position. 1513 */ 1514 reph_step_5: 1515 { 1516 /* Copied from step 2. */ 1517 new_reph_pos = start + 1; 1518 while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 1519 new_reph_pos++; 1520 1521 if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) 1522 { 1523 /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 1524 if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 1525 new_reph_pos++; 1526 goto reph_move; 1527 } 1528 } 1529 1530 /* 6. Otherwise, reorder reph to the end of the syllable. 1531 */ 1532 { 1533 new_reph_pos = end - 1; 1534 while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 1535 new_reph_pos--; 1536 1537 /* 1538 * If the Reph is to be ending up after a Matra,Halant sequence, 1539 * position it before that Halant so it can interact with the Matra. 1540 * However, if it's a plain Consonant,Halant we shouldn't do that. 1541 * Uniscribe doesn't do this. 1542 * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 1543 */ 1544 if (!hb_options ().uniscribe_bug_compatible && 1545 unlikely (is_halant_or_coeng (info[new_reph_pos]))) { 1546 for (unsigned int i = base + 1; i < new_reph_pos; i++) 1547 if (info[i].indic_category() == OT_M) { 1548 /* Ok, got it. */ 1549 new_reph_pos--; 1550 } 1551 } 1552 goto reph_move; 1553 } 1554 1555 reph_move: 1556 { 1557 /* Move */ 1558 buffer->merge_clusters (start, new_reph_pos + 1); 1559 hb_glyph_info_t reph = info[start]; 1560 memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 1561 info[new_reph_pos] = reph; 1562 1563 if (start < base && base <= new_reph_pos) 1564 base--; 1565 } 1566 } 1567 1568 1569 /* o Reorder pre-base reordering consonants: 1570 * 1571 * If a pre-base reordering consonant is found, reorder it according to 1572 * the following rules: 1573 */ 1574 1575 if (try_pref && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */ 1576 { 1577 for (unsigned int i = base + 1; i < end; i++) 1578 if ((info[i].mask & indic_plan->mask_array[PREF]) != 0) 1579 { 1580 /* 1. Only reorder a glyph produced by substitution during application 1581 * of the <pref> feature. (Note that a font may shape a Ra consonant with 1582 * the feature generally but block it in certain contexts.) 1583 */ 1584 /* Note: We just check that something got substituted. We don't check that 1585 * the <pref> feature actually did it... 1586 * 1587 * Reorder pref only if it ligated. */ 1588 if (_hb_glyph_info_ligated_and_didnt_multiply (&info[i])) 1589 { 1590 /* 1591 * 2. Try to find a target position the same way as for pre-base matra. 1592 * If it is found, reorder pre-base consonant glyph. 1593 * 1594 * 3. If position is not found, reorder immediately before main 1595 * consonant. 1596 */ 1597 1598 unsigned int new_pos = base; 1599 /* Malayalam / Tamil do not have "half" forms or explicit virama forms. 1600 * The glyphs formed by 'half' are Chillus or ligated explicit viramas. 1601 * We want to position matra after them. 1602 */ 1603 if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) 1604 { 1605 while (new_pos > start && 1606 !(is_one_of (info[new_pos - 1], FLAG(OT_M) | HALANT_OR_COENG_FLAGS))) 1607 new_pos--; 1608 1609 /* In Khmer coeng model, a H,Ra can go *after* matras. If it goes after a 1610 * split matra, it should be reordered to *before* the left part of such matra. */ 1611 if (new_pos > start && info[new_pos - 1].indic_category() == OT_M) 1612 { 1613 unsigned int old_pos = i; 1614 for (unsigned int j = base + 1; j < old_pos; j++) 1615 if (info[j].indic_category() == OT_M) 1616 { 1617 new_pos--; 1618 break; 1619 } 1620 } 1621 } 1622 1623 if (new_pos > start && is_halant_or_coeng (info[new_pos - 1])) 1624 { 1625 /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 1626 if (new_pos < end && is_joiner (info[new_pos])) 1627 new_pos++; 1628 } 1629 1630 { 1631 unsigned int old_pos = i; 1632 1633 buffer->merge_clusters (new_pos, old_pos + 1); 1634 hb_glyph_info_t tmp = info[old_pos]; 1635 memmove (&info[new_pos + 1], &info[new_pos], (old_pos - new_pos) * sizeof (info[0])); 1636 info[new_pos] = tmp; 1637 1638 if (new_pos <= base && base < old_pos) 1639 base++; 1640 } 1641 } 1642 1643 break; 1644 } 1645 } 1646 1647 1648 /* Apply 'init' to the Left Matra if it's a word start. */ 1649 if (info[start].indic_position () == POS_PRE_M && 1650 (!start || 1651 !(FLAG_SAFE (_hb_glyph_info_get_general_category (&info[start - 1])) & 1652 FLAG_RANGE (HB_UNICODE_GENERAL_CATEGORY_FORMAT, HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))) 1653 info[start].mask |= indic_plan->mask_array[INIT]; 1654 1655 1656 /* 1657 * Finish off the clusters and go home! 1658 */ 1659 if (hb_options ().uniscribe_bug_compatible) 1660 { 1661 switch ((hb_tag_t) plan->props.script) 1662 { 1663 case HB_SCRIPT_TAMIL: 1664 case HB_SCRIPT_SINHALA: 1665 break; 1666 1667 default: 1668 /* Uniscribe merges the entire cluster... Except for Tamil & Sinhala. 1669 * This means, half forms are submerged into the main consonants cluster. 1670 * This is unnecessary, and makes cursor positioning harder, but that's what 1671 * Uniscribe does. */ 1672 buffer->merge_clusters (start, end); 1673 break; 1674 } 1675 } 1676} 1677 1678 1679static void 1680final_reordering (const hb_ot_shape_plan_t *plan, 1681 hb_font_t *font HB_UNUSED, 1682 hb_buffer_t *buffer) 1683{ 1684 unsigned int count = buffer->len; 1685 if (unlikely (!count)) return; 1686 1687 foreach_syllable (buffer, start, end) 1688 final_reordering_syllable (plan, buffer, start, end); 1689 1690 HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 1691 HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 1692} 1693 1694 1695static void 1696clear_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, 1697 hb_font_t *font HB_UNUSED, 1698 hb_buffer_t *buffer) 1699{ 1700 hb_glyph_info_t *info = buffer->info; 1701 unsigned int count = buffer->len; 1702 for (unsigned int i = 0; i < count; i++) 1703 info[i].syllable() = 0; 1704} 1705 1706 1707static bool 1708decompose_indic (const hb_ot_shape_normalize_context_t *c, 1709 hb_codepoint_t ab, 1710 hb_codepoint_t *a, 1711 hb_codepoint_t *b) 1712{ 1713 switch (ab) 1714 { 1715 /* Don't decompose these. */ 1716 case 0x0931u : return false; /* DEVANAGARI LETTER RRA */ 1717 case 0x0B94u : return false; /* TAMIL LETTER AU */ 1718 1719 1720 /* 1721 * Decompose split matras that don't have Unicode decompositions. 1722 */ 1723 1724 /* Khmer */ 1725 case 0x17BEu : *a = 0x17C1u; *b= 0x17BEu; return true; 1726 case 0x17BFu : *a = 0x17C1u; *b= 0x17BFu; return true; 1727 case 0x17C0u : *a = 0x17C1u; *b= 0x17C0u; return true; 1728 case 0x17C4u : *a = 0x17C1u; *b= 0x17C4u; return true; 1729 case 0x17C5u : *a = 0x17C1u; *b= 0x17C5u; return true; 1730 1731#if 0 1732 /* Gujarati */ 1733 /* This one has no decomposition in Unicode, but needs no decomposition either. */ 1734 /* case 0x0AC9u : return false; */ 1735 1736 /* Oriya */ 1737 case 0x0B57u : *a = no decomp, -> RIGHT; return true; 1738#endif 1739 } 1740 1741 if ((ab == 0x0DDAu || hb_in_range (ab, 0x0DDCu, 0x0DDEu))) 1742 { 1743 /* 1744 * Sinhala split matras... Let the fun begin. 1745 * 1746 * These four characters have Unicode decompositions. However, Uniscribe 1747 * decomposes them "Khmer-style", that is, it uses the character itself to 1748 * get the second half. The first half of all four decompositions is always 1749 * U+0DD9. 1750 * 1751 * Now, there are buggy fonts, namely, the widely used lklug.ttf, that are 1752 * broken with Uniscribe. But we need to support them. As such, we only 1753 * do the Uniscribe-style decomposition if the character is transformed into 1754 * its "sec.half" form by the 'pstf' feature. Otherwise, we fall back to 1755 * Unicode decomposition. 1756 * 1757 * Note that we can't unconditionally use Unicode decomposition. That would 1758 * break some other fonts, that are designed to work with Uniscribe, and 1759 * don't have positioning features for the Unicode-style decomposition. 1760 * 1761 * Argh... 1762 * 1763 * The Uniscribe behavior is now documented in the newly published Sinhala 1764 * spec in 2012: 1765 * 1766 * http://www.microsoft.com/typography/OpenTypeDev/sinhala/intro.htm#shaping 1767 */ 1768 1769 const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) c->plan->data; 1770 1771 hb_codepoint_t glyph; 1772 1773 if (hb_options ().uniscribe_bug_compatible || 1774 (c->font->get_nominal_glyph (ab, &glyph) && 1775 indic_plan->pstf.would_substitute (&glyph, 1, c->font->face))) 1776 { 1777 /* Ok, safe to use Uniscribe-style decomposition. */ 1778 *a = 0x0DD9u; 1779 *b = ab; 1780 return true; 1781 } 1782 } 1783 1784 return (bool) c->unicode->decompose (ab, a, b); 1785} 1786 1787static bool 1788compose_indic (const hb_ot_shape_normalize_context_t *c, 1789 hb_codepoint_t a, 1790 hb_codepoint_t b, 1791 hb_codepoint_t *ab) 1792{ 1793 /* Avoid recomposing split matras. */ 1794 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a))) 1795 return false; 1796 1797 /* Composition-exclusion exceptions that we want to recompose. */ 1798 if (a == 0x09AFu && b == 0x09BCu) { *ab = 0x09DFu; return true; } 1799 1800 return (bool) c->unicode->compose (a, b, ab); 1801} 1802 1803 1804const hb_ot_complex_shaper_t _hb_ot_complex_shaper_indic = 1805{ 1806 "indic", 1807 collect_features_indic, 1808 override_features_indic, 1809 data_create_indic, 1810 data_destroy_indic, 1811 NULL, /* preprocess_text */ 1812 NULL, /* postprocess_glyphs */ 1813 HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, 1814 decompose_indic, 1815 compose_indic, 1816 setup_masks_indic, 1817 NULL, /* disable_otl */ 1818 HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, 1819 false, /* fallback_position */ 1820}; 1821