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 46static inline uint16_t hb_uint16_swap (const uint16_t v) 47{ return (v >> 8) | (v << 8); } 48static inline uint32_t hb_uint32_swap (const uint32_t v) 49{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); } 50 51 52typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/( 53 const WCHAR *pwcInChars, 54 int cInChars, 55 int cMaxItems, 56 const SCRIPT_CONTROL *psControl, 57 const SCRIPT_STATE *psState, 58 SCRIPT_ITEM *pItems, 59 OPENTYPE_TAG *pScriptTags, 60 int *pcItems 61); 62 63typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/( 64 HDC hdc, 65 SCRIPT_CACHE *psc, 66 SCRIPT_ANALYSIS *psa, 67 OPENTYPE_TAG tagScript, 68 OPENTYPE_TAG tagLangSys, 69 int *rcRangeChars, 70 TEXTRANGE_PROPERTIES **rpRangeProperties, 71 int cRanges, 72 const WCHAR *pwcChars, 73 int cChars, 74 int cMaxGlyphs, 75 WORD *pwLogClust, 76 SCRIPT_CHARPROP *pCharProps, 77 WORD *pwOutGlyphs, 78 SCRIPT_GLYPHPROP *pOutGlyphProps, 79 int *pcGlyphs 80); 81 82typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/( 83 HDC hdc, 84 SCRIPT_CACHE *psc, 85 SCRIPT_ANALYSIS *psa, 86 OPENTYPE_TAG tagScript, 87 OPENTYPE_TAG tagLangSys, 88 int *rcRangeChars, 89 TEXTRANGE_PROPERTIES **rpRangeProperties, 90 int cRanges, 91 const WCHAR *pwcChars, 92 WORD *pwLogClust, 93 SCRIPT_CHARPROP *pCharProps, 94 int cChars, 95 const WORD *pwGlyphs, 96 const SCRIPT_GLYPHPROP *pGlyphProps, 97 int cGlyphs, 98 int *piAdvance, 99 GOFFSET *pGoffset, 100 ABC *pABC 101); 102 103 104/* Fallback implementations. */ 105 106static HRESULT WINAPI 107hb_ScriptItemizeOpenType( 108 const WCHAR *pwcInChars, 109 int cInChars, 110 int cMaxItems, 111 const SCRIPT_CONTROL *psControl, 112 const SCRIPT_STATE *psState, 113 SCRIPT_ITEM *pItems, 114 OPENTYPE_TAG *pScriptTags, 115 int *pcItems 116) 117{ 118{ 119 return ScriptItemize (pwcInChars, 120 cInChars, 121 cMaxItems, 122 psControl, 123 psState, 124 pItems, 125 pcItems); 126} 127} 128 129static HRESULT WINAPI 130hb_ScriptShapeOpenType( 131 HDC hdc, 132 SCRIPT_CACHE *psc, 133 SCRIPT_ANALYSIS *psa, 134 OPENTYPE_TAG tagScript, 135 OPENTYPE_TAG tagLangSys, 136 int *rcRangeChars, 137 TEXTRANGE_PROPERTIES **rpRangeProperties, 138 int cRanges, 139 const WCHAR *pwcChars, 140 int cChars, 141 int cMaxGlyphs, 142 WORD *pwLogClust, 143 SCRIPT_CHARPROP *pCharProps, 144 WORD *pwOutGlyphs, 145 SCRIPT_GLYPHPROP *pOutGlyphProps, 146 int *pcGlyphs 147) 148{ 149 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps; 150 return ScriptShape (hdc, 151 psc, 152 pwcChars, 153 cChars, 154 cMaxGlyphs, 155 psa, 156 pwOutGlyphs, 157 pwLogClust, 158 psva, 159 pcGlyphs); 160} 161 162static HRESULT WINAPI 163hb_ScriptPlaceOpenType( 164 HDC hdc, 165 SCRIPT_CACHE *psc, 166 SCRIPT_ANALYSIS *psa, 167 OPENTYPE_TAG tagScript, 168 OPENTYPE_TAG tagLangSys, 169 int *rcRangeChars, 170 TEXTRANGE_PROPERTIES **rpRangeProperties, 171 int cRanges, 172 const WCHAR *pwcChars, 173 WORD *pwLogClust, 174 SCRIPT_CHARPROP *pCharProps, 175 int cChars, 176 const WORD *pwGlyphs, 177 const SCRIPT_GLYPHPROP *pGlyphProps, 178 int cGlyphs, 179 int *piAdvance, 180 GOFFSET *pGoffset, 181 ABC *pABC 182) 183{ 184 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps; 185 return ScriptPlace (hdc, 186 psc, 187 pwGlyphs, 188 cGlyphs, 189 psva, 190 psa, 191 piAdvance, 192 pGoffset, 193 pABC); 194} 195 196 197struct hb_uniscribe_shaper_funcs_t { 198 SIOT ScriptItemizeOpenType; 199 SSOT ScriptShapeOpenType; 200 SPOT ScriptPlaceOpenType; 201 202 inline void init (void) 203 { 204 HMODULE hinstLib; 205 this->ScriptItemizeOpenType = NULL; 206 this->ScriptShapeOpenType = NULL; 207 this->ScriptPlaceOpenType = NULL; 208 209 hinstLib = GetModuleHandle (TEXT ("usp10.dll")); 210 if (hinstLib) 211 { 212 this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType"); 213 this->ScriptShapeOpenType = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType"); 214 this->ScriptPlaceOpenType = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType"); 215 } 216 if (!this->ScriptItemizeOpenType || 217 !this->ScriptShapeOpenType || 218 !this->ScriptPlaceOpenType) 219 { 220 DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back."); 221 this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType; 222 this->ScriptShapeOpenType = hb_ScriptShapeOpenType; 223 this->ScriptPlaceOpenType = hb_ScriptPlaceOpenType; 224 } 225 } 226}; 227static hb_uniscribe_shaper_funcs_t *uniscribe_funcs; 228 229static inline void 230free_uniscribe_funcs (void) 231{ 232 free (uniscribe_funcs); 233} 234 235static hb_uniscribe_shaper_funcs_t * 236hb_uniscribe_shaper_get_funcs (void) 237{ 238retry: 239 hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs); 240 241 if (unlikely (!funcs)) 242 { 243 funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t)); 244 if (unlikely (!funcs)) 245 return NULL; 246 247 funcs->init (); 248 249 if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) { 250 free (funcs); 251 goto retry; 252 } 253 254#ifdef HB_USE_ATEXIT 255 atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */ 256#endif 257 } 258 259 return funcs; 260} 261 262 263struct active_feature_t { 264 OPENTYPE_FEATURE_RECORD rec; 265 unsigned int order; 266 267 static int cmp (const active_feature_t *a, const active_feature_t *b) { 268 return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 : 269 a->order < b->order ? -1 : a->order > b->order ? 1 : 270 a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 1 : 271 0; 272 } 273 bool operator== (const active_feature_t *f) { 274 return cmp (this, f) == 0; 275 } 276}; 277 278struct feature_event_t { 279 unsigned int index; 280 bool start; 281 active_feature_t feature; 282 283 static int cmp (const feature_event_t *a, const feature_event_t *b) { 284 return a->index < b->index ? -1 : a->index > b->index ? 1 : 285 a->start < b->start ? -1 : a->start > b->start ? 1 : 286 active_feature_t::cmp (&a->feature, &b->feature); 287 } 288}; 289 290struct range_record_t { 291 TEXTRANGE_PROPERTIES props; 292 unsigned int index_first; /* == start */ 293 unsigned int index_last; /* == end - 1 */ 294}; 295 296HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face) 297HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font) 298 299 300/* 301 * shaper face data 302 */ 303 304struct hb_uniscribe_shaper_face_data_t { 305 HANDLE fh; 306 hb_uniscribe_shaper_funcs_t *funcs; 307 wchar_t face_name[LF_FACESIZE]; 308}; 309 310/* face_name should point to a wchar_t[LF_FACESIZE] object. */ 311static void 312_hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen) 313{ 314 /* We'll create a private name for the font from a UUID using a simple, 315 * somewhat base64-like encoding scheme */ 316 const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-"; 317 UUID id; 318 UuidCreate ((UUID*) &id); 319 ASSERT_STATIC (2 + 3 * (16/2) < LF_FACESIZE); 320 unsigned int name_str_len = 0; 321 face_name[name_str_len++] = 'F'; 322 face_name[name_str_len++] = '_'; 323 unsigned char *p = (unsigned char *) &id; 324 for (unsigned int i = 0; i < 16; i += 2) 325 { 326 /* Spread the 16 bits from two bytes of the UUID across three chars of face_name, 327 * using the bits in groups of 5,5,6 to select chars from enc. 328 * This will generate 24 characters; with the 'F_' prefix we already provided, 329 * the name will be 26 chars (plus the NUL terminator), so will always fit within 330 * face_name (LF_FACESIZE = 32). */ 331 face_name[name_str_len++] = enc[p[i] >> 3]; 332 face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f]; 333 face_name[name_str_len++] = enc[p[i + 1] & 0x3f]; 334 } 335 face_name[name_str_len] = 0; 336 if (plen) 337 *plen = name_str_len; 338} 339 340/* Destroys blob. */ 341static hb_blob_t * 342_hb_rename_font (hb_blob_t *blob, wchar_t *new_name) 343{ 344 /* Create a copy of the font data, with the 'name' table replaced by a 345 * table that names the font with our private F_* name created above. 346 * For simplicity, we just append a new 'name' table and update the 347 * sfnt directory; the original table is left in place, but unused. 348 * 349 * The new table will contain just 5 name IDs: family, style, unique, 350 * full, PS. All of them point to the same name data with our unique name. 351 */ 352 353 blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob); 354 355 unsigned int length, new_length, name_str_len; 356 const char *orig_sfnt_data = hb_blob_get_data (blob, &length); 357 358 _hb_generate_unique_face_name (new_name, &name_str_len); 359 360 static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 }; 361 362 unsigned int name_table_length = OT::name::min_size + 363 ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size + 364 name_str_len * 2; /* for name data in UTF16BE form */ 365 unsigned int name_table_offset = (length + 3) & ~3; 366 367 new_length = name_table_offset + ((name_table_length + 3) & ~3); 368 void *new_sfnt_data = calloc (1, new_length); 369 if (!new_sfnt_data) 370 { 371 hb_blob_destroy (blob); 372 return NULL; 373 } 374 375 memcpy(new_sfnt_data, orig_sfnt_data, length); 376 377 OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset); 378 name.format.set (0); 379 name.count.set (ARRAY_LENGTH (name_IDs)); 380 name.stringOffset.set (name.get_size ()); 381 for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++) 382 { 383 OT::NameRecord &record = name.nameRecord[i]; 384 record.platformID.set (3); 385 record.encodingID.set (1); 386 record.languageID.set (0x0409u); /* English */ 387 record.nameID.set (name_IDs[i]); 388 record.length.set (name_str_len * 2); 389 record.offset.set (0); 390 } 391 392 /* Copy string data from new_name, converting wchar_t to UTF16BE. */ 393 unsigned char *p = &OT::StructAfter<unsigned char> (name); 394 for (unsigned int i = 0; i < name_str_len; i++) 395 { 396 *p++ = new_name[i] >> 8; 397 *p++ = new_name[i] & 0xff; 398 } 399 400 /* Adjust name table entry to point to new name table */ 401 const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data); 402 unsigned int face_count = file.get_face_count (); 403 for (unsigned int face_index = 0; face_index < face_count; face_index++) 404 { 405 /* Note: doing multiple edits (ie. TTC) can be unsafe. There may be 406 * toe-stepping. But we don't really care. */ 407 const OT::OpenTypeFontFace &face = file.get_face (face_index); 408 unsigned int index; 409 if (face.find_table_index (HB_OT_TAG_name, &index)) 410 { 411 OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index)); 412 record.checkSum.set_for_data (&name, name_table_length); 413 record.offset.set (name_table_offset); 414 record.length.set (name_table_length); 415 } 416 else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */ 417 { 418 free (new_sfnt_data); 419 hb_blob_destroy (blob); 420 return NULL; 421 } 422 } 423 424 /* The checkSumAdjustment field in the 'head' table is now wrong, 425 * but that doesn't actually seem to cause any problems so we don't 426 * bother. */ 427 428 hb_blob_destroy (blob); 429 return hb_blob_create ((const char *) new_sfnt_data, new_length, 430 HB_MEMORY_MODE_WRITABLE, NULL, free); 431} 432 433hb_uniscribe_shaper_face_data_t * 434_hb_uniscribe_shaper_face_data_create (hb_face_t *face) 435{ 436 hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t)); 437 if (unlikely (!data)) 438 return NULL; 439 440 data->funcs = hb_uniscribe_shaper_get_funcs (); 441 if (unlikely (!data->funcs)) 442 { 443 free (data); 444 return NULL; 445 } 446 447 hb_blob_t *blob = hb_face_reference_blob (face); 448 if (unlikely (!hb_blob_get_length (blob))) 449 DEBUG_MSG (UNISCRIBE, face, "Face has empty blob"); 450 451 blob = _hb_rename_font (blob, data->face_name); 452 if (unlikely (!blob)) 453 { 454 free (data); 455 return NULL; 456 } 457 458 DWORD num_fonts_installed; 459 data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL), 460 hb_blob_get_length (blob), 461 0, &num_fonts_installed); 462 if (unlikely (!data->fh)) 463 { 464 DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed"); 465 free (data); 466 return NULL; 467 } 468 469 return data; 470} 471 472void 473_hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data) 474{ 475 RemoveFontMemResourceEx (data->fh); 476 free (data); 477} 478 479 480/* 481 * shaper font data 482 */ 483 484struct hb_uniscribe_shaper_font_data_t { 485 HDC hdc; 486 LOGFONTW log_font; 487 HFONT hfont; 488 SCRIPT_CACHE script_cache; 489}; 490 491static bool 492populate_log_font (LOGFONTW *lf, 493 hb_font_t *font) 494{ 495 memset (lf, 0, sizeof (*lf)); 496 lf->lfHeight = -font->y_scale; 497 lf->lfCharSet = DEFAULT_CHARSET; 498 499 hb_face_t *face = font->face; 500 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 501 502 memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName)); 503 504 return true; 505} 506 507hb_uniscribe_shaper_font_data_t * 508_hb_uniscribe_shaper_font_data_create (hb_font_t *font) 509{ 510 if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL; 511 512 hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t)); 513 if (unlikely (!data)) 514 return NULL; 515 516 data->hdc = GetDC (NULL); 517 518 if (unlikely (!populate_log_font (&data->log_font, font))) { 519 DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed"); 520 _hb_uniscribe_shaper_font_data_destroy (data); 521 return NULL; 522 } 523 524 data->hfont = CreateFontIndirectW (&data->log_font); 525 if (unlikely (!data->hfont)) { 526 DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed"); 527 _hb_uniscribe_shaper_font_data_destroy (data); 528 return NULL; 529 } 530 531 if (!SelectObject (data->hdc, data->hfont)) { 532 DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed"); 533 _hb_uniscribe_shaper_font_data_destroy (data); 534 return NULL; 535 } 536 537 return data; 538} 539 540void 541_hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data) 542{ 543 if (data->hdc) 544 ReleaseDC (NULL, data->hdc); 545 if (data->hfont) 546 DeleteObject (data->hfont); 547 if (data->script_cache) 548 ScriptFreeCache (&data->script_cache); 549 free (data); 550} 551 552LOGFONTW * 553hb_uniscribe_font_get_logfontw (hb_font_t *font) 554{ 555 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 556 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 557 return &font_data->log_font; 558} 559 560HFONT 561hb_uniscribe_font_get_hfont (hb_font_t *font) 562{ 563 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 564 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 565 return font_data->hfont; 566} 567 568 569/* 570 * shaper shape_plan data 571 */ 572 573struct hb_uniscribe_shaper_shape_plan_data_t {}; 574 575hb_uniscribe_shaper_shape_plan_data_t * 576_hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 577 const hb_feature_t *user_features HB_UNUSED, 578 unsigned int num_user_features HB_UNUSED) 579{ 580 return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 581} 582 583void 584_hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED) 585{ 586} 587 588 589/* 590 * shaper 591 */ 592 593 594hb_bool_t 595_hb_uniscribe_shape (hb_shape_plan_t *shape_plan, 596 hb_font_t *font, 597 hb_buffer_t *buffer, 598 const hb_feature_t *features, 599 unsigned int num_features) 600{ 601 hb_face_t *face = font->face; 602 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 603 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 604 hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs; 605 606 /* 607 * Set up features. 608 */ 609 hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records; 610 hb_auto_array_t<range_record_t> range_records; 611 if (num_features) 612 { 613 /* Sort features by start/end events. */ 614 hb_auto_array_t<feature_event_t> feature_events; 615 for (unsigned int i = 0; i < num_features; i++) 616 { 617 active_feature_t feature; 618 feature.rec.tagFeature = hb_uint32_swap (features[i].tag); 619 feature.rec.lParameter = features[i].value; 620 feature.order = i; 621 622 feature_event_t *event; 623 624 event = feature_events.push (); 625 if (unlikely (!event)) 626 goto fail_features; 627 event->index = features[i].start; 628 event->start = true; 629 event->feature = feature; 630 631 event = feature_events.push (); 632 if (unlikely (!event)) 633 goto fail_features; 634 event->index = features[i].end; 635 event->start = false; 636 event->feature = feature; 637 } 638 feature_events.qsort (); 639 /* Add a strategic final event. */ 640 { 641 active_feature_t feature; 642 feature.rec.tagFeature = 0; 643 feature.rec.lParameter = 0; 644 feature.order = num_features + 1; 645 646 feature_event_t *event = feature_events.push (); 647 if (unlikely (!event)) 648 goto fail_features; 649 event->index = 0; /* This value does magic. */ 650 event->start = false; 651 event->feature = feature; 652 } 653 654 /* Scan events and save features for each range. */ 655 hb_auto_array_t<active_feature_t> active_features; 656 unsigned int last_index = 0; 657 for (unsigned int i = 0; i < feature_events.len; i++) 658 { 659 feature_event_t *event = &feature_events[i]; 660 661 if (event->index != last_index) 662 { 663 /* Save a snapshot of active features and the range. */ 664 range_record_t *range = range_records.push (); 665 if (unlikely (!range)) 666 goto fail_features; 667 668 unsigned int offset = feature_records.len; 669 670 active_features.qsort (); 671 for (unsigned int j = 0; j < active_features.len; j++) 672 { 673 if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature) 674 { 675 OPENTYPE_FEATURE_RECORD *feature = feature_records.push (); 676 if (unlikely (!feature)) 677 goto fail_features; 678 *feature = active_features[j].rec; 679 } 680 else 681 { 682 /* Overrides value for existing feature. */ 683 feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter; 684 } 685 } 686 687 /* Will convert to pointer after all is ready, since feature_records.array 688 * may move as we grow it. */ 689 range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset); 690 range->props.cotfRecords = feature_records.len - offset; 691 range->index_first = last_index; 692 range->index_last = event->index - 1; 693 694 last_index = event->index; 695 } 696 697 if (event->start) { 698 active_feature_t *feature = active_features.push (); 699 if (unlikely (!feature)) 700 goto fail_features; 701 *feature = event->feature; 702 } else { 703 active_feature_t *feature = active_features.find (&event->feature); 704 if (feature) 705 active_features.remove (feature - active_features.array); 706 } 707 } 708 709 if (!range_records.len) /* No active feature found. */ 710 goto fail_features; 711 712 /* Fixup the pointers. */ 713 for (unsigned int i = 0; i < range_records.len; i++) 714 { 715 range_record_t *range = &range_records[i]; 716 range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords); 717 } 718 } 719 else 720 { 721 fail_features: 722 num_features = 0; 723 } 724 725#define FAIL(...) \ 726 HB_STMT_START { \ 727 DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \ 728 return false; \ 729 } HB_STMT_END; 730 731 HRESULT hr; 732 733retry: 734 735 unsigned int scratch_size; 736 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); 737 738#define ALLOCATE_ARRAY(Type, name, len) \ 739 Type *name = (Type *) scratch; \ 740 { \ 741 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ 742 assert (_consumed <= scratch_size); \ 743 scratch += _consumed; \ 744 scratch_size -= _consumed; \ 745 } 746 747#define utf16_index() var1.u32 748 749 ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2); 750 751 unsigned int chars_len = 0; 752 for (unsigned int i = 0; i < buffer->len; i++) 753 { 754 hb_codepoint_t c = buffer->info[i].codepoint; 755 buffer->info[i].utf16_index() = chars_len; 756 if (likely (c <= 0xFFFFu)) 757 pchars[chars_len++] = c; 758 else if (unlikely (c > 0x10FFFFu)) 759 pchars[chars_len++] = 0xFFFDu; 760 else { 761 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10); 762 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1)); 763 } 764 } 765 766 ALLOCATE_ARRAY (WORD, log_clusters, chars_len); 767 ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len); 768 769 if (num_features) 770 { 771 /* Need log_clusters to assign features. */ 772 chars_len = 0; 773 for (unsigned int i = 0; i < buffer->len; i++) 774 { 775 hb_codepoint_t c = buffer->info[i].codepoint; 776 unsigned int cluster = buffer->info[i].cluster; 777 log_clusters[chars_len++] = cluster; 778 if (hb_in_range (c, 0x10000u, 0x10FFFFu)) 779 log_clusters[chars_len++] = cluster; /* Surrogates. */ 780 } 781 } 782 783 /* The -2 in the following is to compensate for possible 784 * alignment needed after the WORD array. sizeof(WORD) == 2. */ 785 unsigned int glyphs_size = (scratch_size * sizeof (int) - 2) 786 / (sizeof (WORD) + 787 sizeof (SCRIPT_GLYPHPROP) + 788 sizeof (int) + 789 sizeof (GOFFSET) + 790 sizeof (uint32_t)); 791 792 ALLOCATE_ARRAY (WORD, glyphs, glyphs_size); 793 ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size); 794 ALLOCATE_ARRAY (int, advances, glyphs_size); 795 ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size); 796 ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size); 797 798 /* Note: 799 * We can't touch the contents of glyph_props. Our fallback 800 * implementations of Shape and Place functions use that buffer 801 * by casting it to a different type. It works because they 802 * both agree about it, but if we want to access it here we 803 * need address that issue first. 804 */ 805 806#undef ALLOCATE_ARRAY 807 808#define MAX_ITEMS 256 809 810 SCRIPT_ITEM items[MAX_ITEMS + 1]; 811 SCRIPT_CONTROL bidi_control = {0}; 812 SCRIPT_STATE bidi_state = {0}; 813 ULONG script_tags[MAX_ITEMS]; 814 int item_count; 815 816 /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */ 817 //bidi_control.fMergeNeutralItems = true; 818 *(uint32_t*)&bidi_control |= 1<<24; 819 820 bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; 821 bidi_state.fOverrideDirection = 1; 822 823 hr = funcs->ScriptItemizeOpenType (pchars, 824 chars_len, 825 MAX_ITEMS, 826 &bidi_control, 827 &bidi_state, 828 items, 829 script_tags, 830 &item_count); 831 if (unlikely (FAILED (hr))) 832 FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr); 833 834#undef MAX_ITEMS 835 836 OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language)); 837 hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties; 838 hb_auto_array_t<int> range_char_counts; 839 840 unsigned int glyphs_offset = 0; 841 unsigned int glyphs_len; 842 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); 843 for (unsigned int i = 0; i < item_count; i++) 844 { 845 unsigned int chars_offset = items[i].iCharPos; 846 unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset; 847 848 if (num_features) 849 { 850 range_properties.shrink (0); 851 range_char_counts.shrink (0); 852 853 range_record_t *last_range = &range_records[0]; 854 855 for (unsigned int k = chars_offset; k < chars_offset + item_chars_len; k++) 856 { 857 range_record_t *range = last_range; 858 while (log_clusters[k] < range->index_first) 859 range--; 860 while (log_clusters[k] > range->index_last) 861 range++; 862 if (!range_properties.len || 863 &range->props != range_properties[range_properties.len - 1]) 864 { 865 TEXTRANGE_PROPERTIES **props = range_properties.push (); 866 int *c = range_char_counts.push (); 867 if (unlikely (!props || !c)) 868 { 869 range_properties.shrink (0); 870 range_char_counts.shrink (0); 871 break; 872 } 873 *props = &range->props; 874 *c = 1; 875 } 876 else 877 { 878 range_char_counts[range_char_counts.len - 1]++; 879 } 880 881 last_range = range; 882 } 883 } 884 885 /* Asking for glyphs in logical order circumvents at least 886 * one bug in Uniscribe. */ 887 items[i].a.fLogicalOrder = true; 888 889 retry_shape: 890 hr = funcs->ScriptShapeOpenType (font_data->hdc, 891 &font_data->script_cache, 892 &items[i].a, 893 script_tags[i], 894 language_tag, 895 range_char_counts.array, 896 range_properties.array, 897 range_properties.len, 898 pchars + chars_offset, 899 item_chars_len, 900 glyphs_size - glyphs_offset, 901 /* out */ 902 log_clusters + chars_offset, 903 char_props + chars_offset, 904 glyphs + glyphs_offset, 905 glyph_props + glyphs_offset, 906 (int *) &glyphs_len); 907 908 if (unlikely (items[i].a.fNoGlyphIndex)) 909 FAIL ("ScriptShapeOpenType() set fNoGlyphIndex"); 910 if (unlikely (hr == E_OUTOFMEMORY)) 911 { 912 if (unlikely (!buffer->ensure (buffer->allocated * 2))) 913 FAIL ("Buffer resize failed"); 914 goto retry; 915 } 916 if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT)) 917 { 918 if (items[i].a.eScript == SCRIPT_UNDEFINED) 919 FAIL ("ScriptShapeOpenType() failed: Font doesn't support script"); 920 items[i].a.eScript = SCRIPT_UNDEFINED; 921 goto retry_shape; 922 } 923 if (unlikely (FAILED (hr))) 924 { 925 FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr); 926 } 927 928 for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++) 929 log_clusters[j] += glyphs_offset; 930 931 hr = funcs->ScriptPlaceOpenType (font_data->hdc, 932 &font_data->script_cache, 933 &items[i].a, 934 script_tags[i], 935 language_tag, 936 range_char_counts.array, 937 range_properties.array, 938 range_properties.len, 939 pchars + chars_offset, 940 log_clusters + chars_offset, 941 char_props + chars_offset, 942 item_chars_len, 943 glyphs + glyphs_offset, 944 glyph_props + glyphs_offset, 945 glyphs_len, 946 /* out */ 947 advances + glyphs_offset, 948 offsets + glyphs_offset, 949 NULL); 950 if (unlikely (FAILED (hr))) 951 FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr); 952 953 if (DEBUG_ENABLED (UNISCRIBE)) 954 fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n", 955 i, 956 items[i].a.fRTL, 957 items[i].a.fLayoutRTL, 958 items[i].a.fLogicalOrder, 959 HB_UNTAG (hb_uint32_swap (script_tags[i]))); 960 961 glyphs_offset += glyphs_len; 962 } 963 glyphs_len = glyphs_offset; 964 965 /* Ok, we've got everything we need, now compose output buffer, 966 * very, *very*, carefully! */ 967 968 /* Calculate visual-clusters. That's what we ship. */ 969 for (unsigned int i = 0; i < glyphs_len; i++) 970 vis_clusters[i] = -1; 971 for (unsigned int i = 0; i < buffer->len; i++) { 972 uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]]; 973 *p = MIN (*p, buffer->info[i].cluster); 974 } 975 for (unsigned int i = 1; i < glyphs_len; i++) 976 if (vis_clusters[i] == -1) 977 vis_clusters[i] = vis_clusters[i - 1]; 978 979#undef utf16_index 980 981 if (unlikely (!buffer->ensure (glyphs_len))) 982 FAIL ("Buffer in error"); 983 984#undef FAIL 985 986 /* Set glyph infos */ 987 buffer->len = 0; 988 for (unsigned int i = 0; i < glyphs_len; i++) 989 { 990 hb_glyph_info_t *info = &buffer->info[buffer->len++]; 991 992 info->codepoint = glyphs[i]; 993 info->cluster = vis_clusters[i]; 994 995 /* The rest is crap. Let's store position info there for now. */ 996 info->mask = advances[i]; 997 info->var1.u32 = offsets[i].du; 998 info->var2.u32 = offsets[i].dv; 999 } 1000 1001 /* Set glyph positions */ 1002 buffer->clear_positions (); 1003 for (unsigned int i = 0; i < glyphs_len; i++) 1004 { 1005 hb_glyph_info_t *info = &buffer->info[i]; 1006 hb_glyph_position_t *pos = &buffer->pos[i]; 1007 1008 /* TODO vertical */ 1009 pos->x_advance = info->mask; 1010 pos->x_offset = backward ? -info->var1.u32 : info->var1.u32; 1011 pos->y_offset = info->var2.u32; 1012 } 1013 1014 if (backward) 1015 hb_buffer_reverse (buffer); 1016 1017 /* Wow, done! */ 1018 return true; 1019} 1020 1021 1022