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 #define HB_SHAPER uniscribe 28 #include "hb-shaper-impl-private.hh" 29 30 #include <windows.h> 31 #include <usp10.h> 32 #include <rpc.h> 33 34 #include "hb-uniscribe.h" 35 36 #include "hb-open-file-private.hh" 37 #include "hb-ot-name-table.hh" 38 #include "hb-ot-tag.h" 39 40 41 #ifndef HB_DEBUG_UNISCRIBE 42 #define HB_DEBUG_UNISCRIBE (HB_DEBUG+0) 43 #endif 44 45 46 typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/( 47 const WCHAR *pwcInChars, 48 int cInChars, 49 int cMaxItems, 50 const SCRIPT_CONTROL *psControl, 51 const SCRIPT_STATE *psState, 52 SCRIPT_ITEM *pItems, 53 OPENTYPE_TAG *pScriptTags, 54 int *pcItems 55 ); 56 57 typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/( 58 HDC hdc, 59 SCRIPT_CACHE *psc, 60 SCRIPT_ANALYSIS *psa, 61 OPENTYPE_TAG tagScript, 62 OPENTYPE_TAG tagLangSys, 63 int *rcRangeChars, 64 TEXTRANGE_PROPERTIES **rpRangeProperties, 65 int cRanges, 66 const WCHAR *pwcChars, 67 int cChars, 68 int cMaxGlyphs, 69 WORD *pwLogClust, 70 SCRIPT_CHARPROP *pCharProps, 71 WORD *pwOutGlyphs, 72 SCRIPT_GLYPHPROP *pOutGlyphProps, 73 int *pcGlyphs 74 ); 75 76 typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/( 77 HDC hdc, 78 SCRIPT_CACHE *psc, 79 SCRIPT_ANALYSIS *psa, 80 OPENTYPE_TAG tagScript, 81 OPENTYPE_TAG tagLangSys, 82 int *rcRangeChars, 83 TEXTRANGE_PROPERTIES **rpRangeProperties, 84 int cRanges, 85 const WCHAR *pwcChars, 86 WORD *pwLogClust, 87 SCRIPT_CHARPROP *pCharProps, 88 int cChars, 89 const WORD *pwGlyphs, 90 const SCRIPT_GLYPHPROP *pGlyphProps, 91 int cGlyphs, 92 int *piAdvance, 93 GOFFSET *pGoffset, 94 ABC *pABC 95 ); 96 97 98 /* Fallback implementations. */ 99 100 static HRESULT WINAPI 101 hb_ScriptItemizeOpenType( 102 const WCHAR *pwcInChars, 103 int cInChars, 104 int cMaxItems, 105 const SCRIPT_CONTROL *psControl, 106 const SCRIPT_STATE *psState, 107 SCRIPT_ITEM *pItems, 108 OPENTYPE_TAG *pScriptTags, 109 int *pcItems 110 ) 111 { 112 { 113 return ScriptItemize (pwcInChars, 114 cInChars, 115 cMaxItems, 116 psControl, 117 psState, 118 pItems, 119 pcItems); 120 } 121 } 122 123 static HRESULT WINAPI 124 hb_ScriptShapeOpenType( 125 HDC hdc, 126 SCRIPT_CACHE *psc, 127 SCRIPT_ANALYSIS *psa, 128 OPENTYPE_TAG tagScript, 129 OPENTYPE_TAG tagLangSys, 130 int *rcRangeChars, 131 TEXTRANGE_PROPERTIES **rpRangeProperties, 132 int cRanges, 133 const WCHAR *pwcChars, 134 int cChars, 135 int cMaxGlyphs, 136 WORD *pwLogClust, 137 SCRIPT_CHARPROP *pCharProps, 138 WORD *pwOutGlyphs, 139 SCRIPT_GLYPHPROP *pOutGlyphProps, 140 int *pcGlyphs 141 ) 142 { 143 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps; 144 return ScriptShape (hdc, 145 psc, 146 pwcChars, 147 cChars, 148 cMaxGlyphs, 149 psa, 150 pwOutGlyphs, 151 pwLogClust, 152 psva, 153 pcGlyphs); 154 } 155 156 static HRESULT WINAPI 157 hb_ScriptPlaceOpenType( 158 HDC hdc, 159 SCRIPT_CACHE *psc, 160 SCRIPT_ANALYSIS *psa, 161 OPENTYPE_TAG tagScript, 162 OPENTYPE_TAG tagLangSys, 163 int *rcRangeChars, 164 TEXTRANGE_PROPERTIES **rpRangeProperties, 165 int cRanges, 166 const WCHAR *pwcChars, 167 WORD *pwLogClust, 168 SCRIPT_CHARPROP *pCharProps, 169 int cChars, 170 const WORD *pwGlyphs, 171 const SCRIPT_GLYPHPROP *pGlyphProps, 172 int cGlyphs, 173 int *piAdvance, 174 GOFFSET *pGoffset, 175 ABC *pABC 176 ) 177 { 178 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps; 179 return ScriptPlace (hdc, 180 psc, 181 pwGlyphs, 182 cGlyphs, 183 psva, 184 psa, 185 piAdvance, 186 pGoffset, 187 pABC); 188 } 189 190 191 struct hb_uniscribe_shaper_funcs_t { 192 SIOT ScriptItemizeOpenType; 193 SSOT ScriptShapeOpenType; 194 SPOT ScriptPlaceOpenType; 195 196 inline void init (void) 197 { 198 HMODULE hinstLib; 199 this->ScriptItemizeOpenType = NULL; 200 this->ScriptShapeOpenType = NULL; 201 this->ScriptPlaceOpenType = NULL; 202 203 hinstLib = GetModuleHandle (TEXT ("usp10.dll")); 204 if (hinstLib) 205 { 206 this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType"); 207 this->ScriptShapeOpenType = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType"); 208 this->ScriptPlaceOpenType = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType"); 209 } 210 if (!this->ScriptItemizeOpenType || 211 !this->ScriptShapeOpenType || 212 !this->ScriptPlaceOpenType) 213 { 214 DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back."); 215 this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType; 216 this->ScriptShapeOpenType = hb_ScriptShapeOpenType; 217 this->ScriptPlaceOpenType = hb_ScriptPlaceOpenType; 218 } 219 } 220 }; 221 static hb_uniscribe_shaper_funcs_t *uniscribe_funcs; 222 223 static inline void 224 free_uniscribe_funcs (void) 225 { 226 free (uniscribe_funcs); 227 } 228 229 static hb_uniscribe_shaper_funcs_t * 230 hb_uniscribe_shaper_get_funcs (void) 231 { 232 retry: 233 hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs); 234 235 if (unlikely (!funcs)) 236 { 237 funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t)); 238 if (unlikely (!funcs)) 239 return NULL; 240 241 funcs->init (); 242 243 if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) { 244 free (funcs); 245 goto retry; 246 } 247 248 #ifdef HAVE_ATEXIT 249 atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */ 250 #endif 251 } 252 253 return funcs; 254 } 255 256 257 struct active_feature_t { 258 OPENTYPE_FEATURE_RECORD rec; 259 unsigned int order; 260 261 static int cmp (const active_feature_t *a, const active_feature_t *b) { 262 return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 : 263 a->order < b->order ? -1 : a->order > b->order ? 1 : 264 a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 1 : 265 0; 266 } 267 bool operator== (const active_feature_t *f) { 268 return cmp (this, f) == 0; 269 } 270 }; 271 272 struct feature_event_t { 273 unsigned int index; 274 bool start; 275 active_feature_t feature; 276 277 static int cmp (const feature_event_t *a, const feature_event_t *b) { 278 return a->index < b->index ? -1 : a->index > b->index ? 1 : 279 a->start < b->start ? -1 : a->start > b->start ? 1 : 280 active_feature_t::cmp (&a->feature, &b->feature); 281 } 282 }; 283 284 struct range_record_t { 285 TEXTRANGE_PROPERTIES props; 286 unsigned int index_first; /* == start */ 287 unsigned int index_last; /* == end - 1 */ 288 }; 289 290 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face) 291 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font) 292 293 294 /* 295 * shaper face data 296 */ 297 298 struct hb_uniscribe_shaper_face_data_t { 299 HANDLE fh; 300 hb_uniscribe_shaper_funcs_t *funcs; 301 wchar_t face_name[LF_FACESIZE]; 302 }; 303 304 /* face_name should point to a wchar_t[LF_FACESIZE] object. */ 305 static void 306 _hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen) 307 { 308 /* We'll create a private name for the font from a UUID using a simple, 309 * somewhat base64-like encoding scheme */ 310 const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-"; 311 UUID id; 312 UuidCreate ((UUID*) &id); 313 unsigned int name_str_len = 0; 314 face_name[name_str_len++] = 'F'; 315 face_name[name_str_len++] = '_'; 316 unsigned char *p = (unsigned char *) &id; 317 for (unsigned int i = 0; i < 16; i += 2) 318 { 319 /* Spread the 16 bits from two bytes of the UUID across three chars of face_name, 320 * using the bits in groups of 5,5,6 to select chars from enc. 321 * This will generate 24 characters; with the 'F_' prefix we already provided, 322 * the name will be 26 chars (plus the NUL terminator), so will always fit within 323 * face_name (LF_FACESIZE = 32). */ 324 face_name[name_str_len++] = enc[p[i] >> 3]; 325 face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f]; 326 face_name[name_str_len++] = enc[p[i + 1] & 0x3f]; 327 } 328 face_name[name_str_len] = 0; 329 if (plen) 330 *plen = name_str_len; 331 } 332 333 /* Destroys blob. */ 334 static hb_blob_t * 335 _hb_rename_font (hb_blob_t *blob, wchar_t *new_name) 336 { 337 /* Create a copy of the font data, with the 'name' table replaced by a 338 * table that names the font with our private F_* name created above. 339 * For simplicity, we just append a new 'name' table and update the 340 * sfnt directory; the original table is left in place, but unused. 341 * 342 * The new table will contain just 5 name IDs: family, style, unique, 343 * full, PS. All of them point to the same name data with our unique name. 344 */ 345 346 blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob); 347 348 unsigned int length, new_length, name_str_len; 349 const char *orig_sfnt_data = hb_blob_get_data (blob, &length); 350 351 _hb_generate_unique_face_name (new_name, &name_str_len); 352 353 static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 }; 354 355 unsigned int name_table_length = OT::name::min_size + 356 ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size + 357 name_str_len * 2; /* for name data in UTF16BE form */ 358 unsigned int name_table_offset = (length + 3) & ~3; 359 360 new_length = name_table_offset + ((name_table_length + 3) & ~3); 361 void *new_sfnt_data = calloc (1, new_length); 362 if (!new_sfnt_data) 363 { 364 hb_blob_destroy (blob); 365 return NULL; 366 } 367 368 memcpy(new_sfnt_data, orig_sfnt_data, length); 369 370 OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset); 371 name.format.set (0); 372 name.count.set (ARRAY_LENGTH (name_IDs)); 373 name.stringOffset.set (name.get_size ()); 374 for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++) 375 { 376 OT::NameRecord &record = name.nameRecord[i]; 377 record.platformID.set (3); 378 record.encodingID.set (1); 379 record.languageID.set (0x0409u); /* English */ 380 record.nameID.set (name_IDs[i]); 381 record.length.set (name_str_len * 2); 382 record.offset.set (0); 383 } 384 385 /* Copy string data from new_name, converting wchar_t to UTF16BE. */ 386 unsigned char *p = &OT::StructAfter<unsigned char> (name); 387 for (unsigned int i = 0; i < name_str_len; i++) 388 { 389 *p++ = new_name[i] >> 8; 390 *p++ = new_name[i] & 0xff; 391 } 392 393 /* Adjust name table entry to point to new name table */ 394 const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data); 395 unsigned int face_count = file.get_face_count (); 396 for (unsigned int face_index = 0; face_index < face_count; face_index++) 397 { 398 /* Note: doing multiple edits (ie. TTC) can be unsafe. There may be 399 * toe-stepping. But we don't really care. */ 400 const OT::OpenTypeFontFace &face = file.get_face (face_index); 401 unsigned int index; 402 if (face.find_table_index (HB_OT_TAG_name, &index)) 403 { 404 OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index)); 405 record.checkSum.set_for_data (&name, name_table_length); 406 record.offset.set (name_table_offset); 407 record.length.set (name_table_length); 408 } 409 else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */ 410 { 411 free (new_sfnt_data); 412 hb_blob_destroy (blob); 413 return NULL; 414 } 415 } 416 417 /* The checkSumAdjustment field in the 'head' table is now wrong, 418 * but that doesn't actually seem to cause any problems so we don't 419 * bother. */ 420 421 hb_blob_destroy (blob); 422 return hb_blob_create ((const char *) new_sfnt_data, new_length, 423 HB_MEMORY_MODE_WRITABLE, NULL, free); 424 } 425 426 hb_uniscribe_shaper_face_data_t * 427 _hb_uniscribe_shaper_face_data_create (hb_face_t *face) 428 { 429 hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t)); 430 if (unlikely (!data)) 431 return NULL; 432 433 data->funcs = hb_uniscribe_shaper_get_funcs (); 434 if (unlikely (!data->funcs)) 435 { 436 free (data); 437 return NULL; 438 } 439 440 hb_blob_t *blob = hb_face_reference_blob (face); 441 if (unlikely (!hb_blob_get_length (blob))) 442 DEBUG_MSG (UNISCRIBE, face, "Face has empty blob"); 443 444 blob = _hb_rename_font (blob, data->face_name); 445 if (unlikely (!blob)) 446 { 447 free (data); 448 return NULL; 449 } 450 451 DWORD num_fonts_installed; 452 data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL), 453 hb_blob_get_length (blob), 454 0, &num_fonts_installed); 455 if (unlikely (!data->fh)) 456 { 457 DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed"); 458 free (data); 459 return NULL; 460 } 461 462 return data; 463 } 464 465 void 466 _hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data) 467 { 468 RemoveFontMemResourceEx (data->fh); 469 free (data); 470 } 471 472 473 /* 474 * shaper font data 475 */ 476 477 struct hb_uniscribe_shaper_font_data_t { 478 HDC hdc; 479 LOGFONTW log_font; 480 HFONT hfont; 481 SCRIPT_CACHE script_cache; 482 }; 483 484 static bool 485 populate_log_font (LOGFONTW *lf, 486 hb_font_t *font) 487 { 488 memset (lf, 0, sizeof (*lf)); 489 lf->lfHeight = -font->y_scale; 490 lf->lfCharSet = DEFAULT_CHARSET; 491 492 hb_face_t *face = font->face; 493 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 494 495 memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName)); 496 497 return true; 498 } 499 500 hb_uniscribe_shaper_font_data_t * 501 _hb_uniscribe_shaper_font_data_create (hb_font_t *font) 502 { 503 if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL; 504 505 hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t)); 506 if (unlikely (!data)) 507 return NULL; 508 509 data->hdc = GetDC (NULL); 510 511 if (unlikely (!populate_log_font (&data->log_font, font))) { 512 DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed"); 513 _hb_uniscribe_shaper_font_data_destroy (data); 514 return NULL; 515 } 516 517 data->hfont = CreateFontIndirectW (&data->log_font); 518 if (unlikely (!data->hfont)) { 519 DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed"); 520 _hb_uniscribe_shaper_font_data_destroy (data); 521 return NULL; 522 } 523 524 if (!SelectObject (data->hdc, data->hfont)) { 525 DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed"); 526 _hb_uniscribe_shaper_font_data_destroy (data); 527 return NULL; 528 } 529 530 return data; 531 } 532 533 void 534 _hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data) 535 { 536 if (data->hdc) 537 ReleaseDC (NULL, data->hdc); 538 if (data->hfont) 539 DeleteObject (data->hfont); 540 if (data->script_cache) 541 ScriptFreeCache (&data->script_cache); 542 free (data); 543 } 544 545 LOGFONTW * 546 hb_uniscribe_font_get_logfontw (hb_font_t *font) 547 { 548 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 549 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 550 return &font_data->log_font; 551 } 552 553 HFONT 554 hb_uniscribe_font_get_hfont (hb_font_t *font) 555 { 556 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 557 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 558 return font_data->hfont; 559 } 560 561 562 /* 563 * shaper shape_plan data 564 */ 565 566 struct hb_uniscribe_shaper_shape_plan_data_t {}; 567 568 hb_uniscribe_shaper_shape_plan_data_t * 569 _hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 570 const hb_feature_t *user_features HB_UNUSED, 571 unsigned int num_user_features HB_UNUSED) 572 { 573 return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 574 } 575 576 void 577 _hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED) 578 { 579 } 580 581 582 /* 583 * shaper 584 */ 585 586 587 hb_bool_t 588 _hb_uniscribe_shape (hb_shape_plan_t *shape_plan, 589 hb_font_t *font, 590 hb_buffer_t *buffer, 591 const hb_feature_t *features, 592 unsigned int num_features) 593 { 594 hb_face_t *face = font->face; 595 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 596 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 597 hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs; 598 599 /* 600 * Set up features. 601 */ 602 hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records; 603 hb_auto_array_t<range_record_t> range_records; 604 if (num_features) 605 { 606 /* Sort features by start/end events. */ 607 hb_auto_array_t<feature_event_t> feature_events; 608 for (unsigned int i = 0; i < num_features; i++) 609 { 610 active_feature_t feature; 611 feature.rec.tagFeature = hb_uint32_swap (features[i].tag); 612 feature.rec.lParameter = features[i].value; 613 feature.order = i; 614 615 feature_event_t *event; 616 617 event = feature_events.push (); 618 if (unlikely (!event)) 619 goto fail_features; 620 event->index = features[i].start; 621 event->start = true; 622 event->feature = feature; 623 624 event = feature_events.push (); 625 if (unlikely (!event)) 626 goto fail_features; 627 event->index = features[i].end; 628 event->start = false; 629 event->feature = feature; 630 } 631 feature_events.qsort (); 632 /* Add a strategic final event. */ 633 { 634 active_feature_t feature; 635 feature.rec.tagFeature = 0; 636 feature.rec.lParameter = 0; 637 feature.order = num_features + 1; 638 639 feature_event_t *event = feature_events.push (); 640 if (unlikely (!event)) 641 goto fail_features; 642 event->index = 0; /* This value does magic. */ 643 event->start = false; 644 event->feature = feature; 645 } 646 647 /* Scan events and save features for each range. */ 648 hb_auto_array_t<active_feature_t> active_features; 649 unsigned int last_index = 0; 650 for (unsigned int i = 0; i < feature_events.len; i++) 651 { 652 feature_event_t *event = &feature_events[i]; 653 654 if (event->index != last_index) 655 { 656 /* Save a snapshot of active features and the range. */ 657 range_record_t *range = range_records.push (); 658 if (unlikely (!range)) 659 goto fail_features; 660 661 unsigned int offset = feature_records.len; 662 663 active_features.qsort (); 664 for (unsigned int j = 0; j < active_features.len; j++) 665 { 666 if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature) 667 { 668 OPENTYPE_FEATURE_RECORD *feature = feature_records.push (); 669 if (unlikely (!feature)) 670 goto fail_features; 671 *feature = active_features[j].rec; 672 } 673 else 674 { 675 /* Overrides value for existing feature. */ 676 feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter; 677 } 678 } 679 680 /* Will convert to pointer after all is ready, since feature_records.array 681 * may move as we grow it. */ 682 range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset); 683 range->props.cotfRecords = feature_records.len - offset; 684 range->index_first = last_index; 685 range->index_last = event->index - 1; 686 687 last_index = event->index; 688 } 689 690 if (event->start) { 691 active_feature_t *feature = active_features.push (); 692 if (unlikely (!feature)) 693 goto fail_features; 694 *feature = event->feature; 695 } else { 696 active_feature_t *feature = active_features.find (&event->feature); 697 if (feature) 698 active_features.remove (feature - active_features.array); 699 } 700 } 701 702 if (!range_records.len) /* No active feature found. */ 703 goto fail_features; 704 705 /* Fixup the pointers. */ 706 for (unsigned int i = 0; i < range_records.len; i++) 707 { 708 range_record_t *range = &range_records[i]; 709 range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords); 710 } 711 } 712 else 713 { 714 fail_features: 715 num_features = 0; 716 } 717 718 #define FAIL(...) \ 719 HB_STMT_START { \ 720 DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \ 721 return false; \ 722 } HB_STMT_END; 723 724 HRESULT hr; 725 726 retry: 727 728 unsigned int scratch_size; 729 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); 730 731 #define ALLOCATE_ARRAY(Type, name, len) \ 732 Type *name = (Type *) scratch; \ 733 { \ 734 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ 735 assert (_consumed <= scratch_size); \ 736 scratch += _consumed; \ 737 scratch_size -= _consumed; \ 738 } 739 740 #define utf16_index() var1.u32 741 742 ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2); 743 744 unsigned int chars_len = 0; 745 for (unsigned int i = 0; i < buffer->len; i++) 746 { 747 hb_codepoint_t c = buffer->info[i].codepoint; 748 buffer->info[i].utf16_index() = chars_len; 749 if (likely (c <= 0xFFFFu)) 750 pchars[chars_len++] = c; 751 else if (unlikely (c > 0x10FFFFu)) 752 pchars[chars_len++] = 0xFFFDu; 753 else { 754 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10); 755 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1)); 756 } 757 } 758 759 ALLOCATE_ARRAY (WORD, log_clusters, chars_len); 760 ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len); 761 762 if (num_features) 763 { 764 /* Need log_clusters to assign features. */ 765 chars_len = 0; 766 for (unsigned int i = 0; i < buffer->len; i++) 767 { 768 hb_codepoint_t c = buffer->info[i].codepoint; 769 unsigned int cluster = buffer->info[i].cluster; 770 log_clusters[chars_len++] = cluster; 771 if (hb_in_range (c, 0x10000u, 0x10FFFFu)) 772 log_clusters[chars_len++] = cluster; /* Surrogates. */ 773 } 774 } 775 776 /* The -2 in the following is to compensate for possible 777 * alignment needed after the WORD array. sizeof(WORD) == 2. */ 778 unsigned int glyphs_size = (scratch_size * sizeof (int) - 2) 779 / (sizeof (WORD) + 780 sizeof (SCRIPT_GLYPHPROP) + 781 sizeof (int) + 782 sizeof (GOFFSET) + 783 sizeof (uint32_t)); 784 785 ALLOCATE_ARRAY (WORD, glyphs, glyphs_size); 786 ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size); 787 ALLOCATE_ARRAY (int, advances, glyphs_size); 788 ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size); 789 ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size); 790 791 /* Note: 792 * We can't touch the contents of glyph_props. Our fallback 793 * implementations of Shape and Place functions use that buffer 794 * by casting it to a different type. It works because they 795 * both agree about it, but if we want to access it here we 796 * need address that issue first. 797 */ 798 799 #undef ALLOCATE_ARRAY 800 801 #define MAX_ITEMS 256 802 803 SCRIPT_ITEM items[MAX_ITEMS + 1]; 804 SCRIPT_CONTROL bidi_control = {0}; 805 SCRIPT_STATE bidi_state = {0}; 806 ULONG script_tags[MAX_ITEMS]; 807 int item_count; 808 809 /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */ 810 //bidi_control.fMergeNeutralItems = true; 811 *(uint32_t*)&bidi_control |= 1<<24; 812 813 bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; 814 bidi_state.fOverrideDirection = 1; 815 816 hr = funcs->ScriptItemizeOpenType (pchars, 817 chars_len, 818 MAX_ITEMS, 819 &bidi_control, 820 &bidi_state, 821 items, 822 script_tags, 823 &item_count); 824 if (unlikely (FAILED (hr))) 825 FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr); 826 827 #undef MAX_ITEMS 828 829 OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language)); 830 hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties; 831 hb_auto_array_t<int> range_char_counts; 832 833 unsigned int glyphs_offset = 0; 834 unsigned int glyphs_len; 835 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); 836 for (unsigned int i = 0; i < item_count; i++) 837 { 838 unsigned int chars_offset = items[i].iCharPos; 839 unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset; 840 841 if (num_features) 842 { 843 range_properties.shrink (0); 844 range_char_counts.shrink (0); 845 846 range_record_t *last_range = &range_records[0]; 847 848 for (unsigned int k = chars_offset; k < chars_offset + item_chars_len; k++) 849 { 850 range_record_t *range = last_range; 851 while (log_clusters[k] < range->index_first) 852 range--; 853 while (log_clusters[k] > range->index_last) 854 range++; 855 if (!range_properties.len || 856 &range->props != range_properties[range_properties.len - 1]) 857 { 858 TEXTRANGE_PROPERTIES **props = range_properties.push (); 859 int *c = range_char_counts.push (); 860 if (unlikely (!props || !c)) 861 { 862 range_properties.shrink (0); 863 range_char_counts.shrink (0); 864 break; 865 } 866 *props = &range->props; 867 *c = 1; 868 } 869 else 870 { 871 range_char_counts[range_char_counts.len - 1]++; 872 } 873 874 last_range = range; 875 } 876 } 877 878 /* Asking for glyphs in logical order circumvents at least 879 * one bug in Uniscribe. */ 880 items[i].a.fLogicalOrder = true; 881 882 retry_shape: 883 hr = funcs->ScriptShapeOpenType (font_data->hdc, 884 &font_data->script_cache, 885 &items[i].a, 886 script_tags[i], 887 language_tag, 888 range_char_counts.array, 889 range_properties.array, 890 range_properties.len, 891 pchars + chars_offset, 892 item_chars_len, 893 glyphs_size - glyphs_offset, 894 /* out */ 895 log_clusters + chars_offset, 896 char_props + chars_offset, 897 glyphs + glyphs_offset, 898 glyph_props + glyphs_offset, 899 (int *) &glyphs_len); 900 901 if (unlikely (items[i].a.fNoGlyphIndex)) 902 FAIL ("ScriptShapeOpenType() set fNoGlyphIndex"); 903 if (unlikely (hr == E_OUTOFMEMORY)) 904 { 905 buffer->ensure (buffer->allocated * 2); 906 if (buffer->in_error) 907 FAIL ("Buffer resize failed"); 908 goto retry; 909 } 910 if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT)) 911 { 912 if (items[i].a.eScript == SCRIPT_UNDEFINED) 913 FAIL ("ScriptShapeOpenType() failed: Font doesn't support script"); 914 items[i].a.eScript = SCRIPT_UNDEFINED; 915 goto retry_shape; 916 } 917 if (unlikely (FAILED (hr))) 918 { 919 FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr); 920 } 921 922 for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++) 923 log_clusters[j] += glyphs_offset; 924 925 hr = funcs->ScriptPlaceOpenType (font_data->hdc, 926 &font_data->script_cache, 927 &items[i].a, 928 script_tags[i], 929 language_tag, 930 range_char_counts.array, 931 range_properties.array, 932 range_properties.len, 933 pchars + chars_offset, 934 log_clusters + chars_offset, 935 char_props + chars_offset, 936 item_chars_len, 937 glyphs + glyphs_offset, 938 glyph_props + glyphs_offset, 939 glyphs_len, 940 /* out */ 941 advances + glyphs_offset, 942 offsets + glyphs_offset, 943 NULL); 944 if (unlikely (FAILED (hr))) 945 FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr); 946 947 if (DEBUG_ENABLED (UNISCRIBE)) 948 fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n", 949 i, 950 items[i].a.fRTL, 951 items[i].a.fLayoutRTL, 952 items[i].a.fLogicalOrder, 953 HB_UNTAG (hb_uint32_swap (script_tags[i]))); 954 955 glyphs_offset += glyphs_len; 956 } 957 glyphs_len = glyphs_offset; 958 959 /* Ok, we've got everything we need, now compose output buffer, 960 * very, *very*, carefully! */ 961 962 /* Calculate visual-clusters. That's what we ship. */ 963 for (unsigned int i = 0; i < glyphs_len; i++) 964 vis_clusters[i] = -1; 965 for (unsigned int i = 0; i < buffer->len; i++) { 966 uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]]; 967 *p = MIN (*p, buffer->info[i].cluster); 968 } 969 for (unsigned int i = 1; i < glyphs_len; i++) 970 if (vis_clusters[i] == -1) 971 vis_clusters[i] = vis_clusters[i - 1]; 972 973 #undef utf16_index 974 975 buffer->ensure (glyphs_len); 976 if (buffer->in_error) 977 FAIL ("Buffer in error"); 978 979 #undef FAIL 980 981 /* Set glyph infos */ 982 buffer->len = 0; 983 for (unsigned int i = 0; i < glyphs_len; i++) 984 { 985 hb_glyph_info_t *info = &buffer->info[buffer->len++]; 986 987 info->codepoint = glyphs[i]; 988 info->cluster = vis_clusters[i]; 989 990 /* The rest is crap. Let's store position info there for now. */ 991 info->mask = advances[i]; 992 info->var1.u32 = offsets[i].du; 993 info->var2.u32 = offsets[i].dv; 994 } 995 996 /* Set glyph positions */ 997 buffer->clear_positions (); 998 for (unsigned int i = 0; i < glyphs_len; i++) 999 { 1000 hb_glyph_info_t *info = &buffer->info[i]; 1001 hb_glyph_position_t *pos = &buffer->pos[i]; 1002 1003 /* TODO vertical */ 1004 pos->x_advance = info->mask; 1005 pos->x_offset = backward ? -info->var1.u32 : info->var1.u32; 1006 pos->y_offset = info->var2.u32; 1007 } 1008 1009 if (backward) 1010 hb_buffer_reverse (buffer); 1011 1012 /* Wow, done! */ 1013 return true; 1014 } 1015 1016 1017
