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 static inline uint16_t hb_uint16_swap (const uint16_t v) 47 { return (v >> 8) | (v << 8); } 48 static inline uint32_t hb_uint32_swap (const uint32_t v) 49 { return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); } 50 51 52 typedef 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 63 typedef 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 82 typedef 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. */ 105 106 static HRESULT WINAPI 107 hb_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 } 128 129 static HRESULT WINAPI 130 hb_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 } 161 162 static HRESULT WINAPI 163 hb_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 } 195 196 197 struct 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 }; 227 static hb_uniscribe_shaper_funcs_t *uniscribe_funcs; 228 229 static inline void 230 free_uniscribe_funcs (void) 231 { 232 free (uniscribe_funcs); 233 } 234 235 static hb_uniscribe_shaper_funcs_t * 236 hb_uniscribe_shaper_get_funcs (void) 237 { 238 retry: 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 } 261 262 263 struct 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 }; 277 278 struct 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 }; 289 290 struct range_record_t { 291 TEXTRANGE_PROPERTIES props; 292 unsigned int index_first; /* == start */ 293 unsigned int index_last; /* == end - 1 */ 294 }; 295 296 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face) 297 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font) 298 299 300 /* 301 * shaper face data 302 */ 303 304 struct 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. */ 311 static 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. */ 341 static 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 } 432 433 hb_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 } 471 472 void 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 */ 483 484 struct hb_uniscribe_shaper_font_data_t { 485 HDC hdc; 486 LOGFONTW log_font; 487 HFONT hfont; 488 SCRIPT_CACHE script_cache; 489 double x_mult, y_mult; /* From LOGFONT space to HB space. */ 490 }; 491 492 static bool 493 populate_log_font (LOGFONTW *lf, 494 hb_font_t *font, 495 unsigned int font_size) 496 { 497 memset (lf, 0, sizeof (*lf)); 498 lf->lfHeight = -font_size; 499 lf->lfCharSet = DEFAULT_CHARSET; 500 501 hb_face_t *face = font->face; 502 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 503 504 memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName)); 505 506 return true; 507 } 508 509 hb_uniscribe_shaper_font_data_t * 510 _hb_uniscribe_shaper_font_data_create (hb_font_t *font) 511 { 512 if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL; 513 514 hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t)); 515 if (unlikely (!data)) 516 return NULL; 517 518 int font_size = font->face->get_upem (); /* Default... */ 519 /* No idea if the following is even a good idea. */ 520 if (font->y_ppem) 521 font_size = font->y_ppem; 522 523 if (font_size < 0) 524 font_size = -font_size; 525 data->x_mult = (double) font->x_scale / font_size; 526 data->y_mult = (double) font->y_scale / font_size; 527 528 data->hdc = GetDC (NULL); 529 530 if (unlikely (!populate_log_font (&data->log_font, font, font_size))) { 531 DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed"); 532 _hb_uniscribe_shaper_font_data_destroy (data); 533 return NULL; 534 } 535 536 data->hfont = CreateFontIndirectW (&data->log_font); 537 if (unlikely (!data->hfont)) { 538 DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed"); 539 _hb_uniscribe_shaper_font_data_destroy (data); 540 return NULL; 541 } 542 543 if (!SelectObject (data->hdc, data->hfont)) { 544 DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed"); 545 _hb_uniscribe_shaper_font_data_destroy (data); 546 return NULL; 547 } 548 549 return data; 550 } 551 552 void 553 _hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data) 554 { 555 if (data->hdc) 556 ReleaseDC (NULL, data->hdc); 557 if (data->hfont) 558 DeleteObject (data->hfont); 559 if (data->script_cache) 560 ScriptFreeCache (&data->script_cache); 561 free (data); 562 } 563 564 LOGFONTW * 565 hb_uniscribe_font_get_logfontw (hb_font_t *font) 566 { 567 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 568 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 569 return &font_data->log_font; 570 } 571 572 HFONT 573 hb_uniscribe_font_get_hfont (hb_font_t *font) 574 { 575 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; 576 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 577 return font_data->hfont; 578 } 579 580 581 /* 582 * shaper shape_plan data 583 */ 584 585 struct hb_uniscribe_shaper_shape_plan_data_t {}; 586 587 hb_uniscribe_shaper_shape_plan_data_t * 588 _hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 589 const hb_feature_t *user_features HB_UNUSED, 590 unsigned int num_user_features HB_UNUSED) 591 { 592 return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 593 } 594 595 void 596 _hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED) 597 { 598 } 599 600 601 /* 602 * shaper 603 */ 604 605 606 hb_bool_t 607 _hb_uniscribe_shape (hb_shape_plan_t *shape_plan, 608 hb_font_t *font, 609 hb_buffer_t *buffer, 610 const hb_feature_t *features, 611 unsigned int num_features) 612 { 613 hb_face_t *face = font->face; 614 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); 615 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); 616 hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs; 617 618 /* 619 * Set up features. 620 */ 621 hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records; 622 hb_auto_array_t<range_record_t> range_records; 623 if (num_features) 624 { 625 /* Sort features by start/end events. */ 626 hb_auto_array_t<feature_event_t> feature_events; 627 for (unsigned int i = 0; i < num_features; i++) 628 { 629 active_feature_t feature; 630 feature.rec.tagFeature = hb_uint32_swap (features[i].tag); 631 feature.rec.lParameter = features[i].value; 632 feature.order = i; 633 634 feature_event_t *event; 635 636 event = feature_events.push (); 637 if (unlikely (!event)) 638 goto fail_features; 639 event->index = features[i].start; 640 event->start = true; 641 event->feature = feature; 642 643 event = feature_events.push (); 644 if (unlikely (!event)) 645 goto fail_features; 646 event->index = features[i].end; 647 event->start = false; 648 event->feature = feature; 649 } 650 feature_events.qsort (); 651 /* Add a strategic final event. */ 652 { 653 active_feature_t feature; 654 feature.rec.tagFeature = 0; 655 feature.rec.lParameter = 0; 656 feature.order = num_features + 1; 657 658 feature_event_t *event = feature_events.push (); 659 if (unlikely (!event)) 660 goto fail_features; 661 event->index = 0; /* This value does magic. */ 662 event->start = false; 663 event->feature = feature; 664 } 665 666 /* Scan events and save features for each range. */ 667 hb_auto_array_t<active_feature_t> active_features; 668 unsigned int last_index = 0; 669 for (unsigned int i = 0; i < feature_events.len; i++) 670 { 671 feature_event_t *event = &feature_events[i]; 672 673 if (event->index != last_index) 674 { 675 /* Save a snapshot of active features and the range. */ 676 range_record_t *range = range_records.push (); 677 if (unlikely (!range)) 678 goto fail_features; 679 680 unsigned int offset = feature_records.len; 681 682 active_features.qsort (); 683 for (unsigned int j = 0; j < active_features.len; j++) 684 { 685 if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature) 686 { 687 OPENTYPE_FEATURE_RECORD *feature = feature_records.push (); 688 if (unlikely (!feature)) 689 goto fail_features; 690 *feature = active_features[j].rec; 691 } 692 else 693 { 694 /* Overrides value for existing feature. */ 695 feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter; 696 } 697 } 698 699 /* Will convert to pointer after all is ready, since feature_records.array 700 * may move as we grow it. */ 701 range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset); 702 range->props.cotfRecords = feature_records.len - offset; 703 range->index_first = last_index; 704 range->index_last = event->index - 1; 705 706 last_index = event->index; 707 } 708 709 if (event->start) { 710 active_feature_t *feature = active_features.push (); 711 if (unlikely (!feature)) 712 goto fail_features; 713 *feature = event->feature; 714 } else { 715 active_feature_t *feature = active_features.find (&event->feature); 716 if (feature) 717 active_features.remove (feature - active_features.array); 718 } 719 } 720 721 if (!range_records.len) /* No active feature found. */ 722 goto fail_features; 723 724 /* Fixup the pointers. */ 725 for (unsigned int i = 0; i < range_records.len; i++) 726 { 727 range_record_t *range = &range_records[i]; 728 range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords); 729 } 730 } 731 else 732 { 733 fail_features: 734 num_features = 0; 735 } 736 737 #define FAIL(...) \ 738 HB_STMT_START { \ 739 DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \ 740 return false; \ 741 } HB_STMT_END; 742 743 HRESULT hr; 744 745 retry: 746 747 unsigned int scratch_size; 748 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); 749 750 #define ALLOCATE_ARRAY(Type, name, len) \ 751 Type *name = (Type *) scratch; \ 752 { \ 753 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ 754 assert (_consumed <= scratch_size); \ 755 scratch += _consumed; \ 756 scratch_size -= _consumed; \ 757 } 758 759 #define utf16_index() var1.u32 760 761 ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2); 762 763 unsigned int chars_len = 0; 764 for (unsigned int i = 0; i < buffer->len; i++) 765 { 766 hb_codepoint_t c = buffer->info[i].codepoint; 767 buffer->info[i].utf16_index() = chars_len; 768 if (likely (c <= 0xFFFFu)) 769 pchars[chars_len++] = c; 770 else if (unlikely (c > 0x10FFFFu)) 771 pchars[chars_len++] = 0xFFFDu; 772 else { 773 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10); 774 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1)); 775 } 776 } 777 778 ALLOCATE_ARRAY (WORD, log_clusters, chars_len); 779 ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len); 780 781 if (num_features) 782 { 783 /* Need log_clusters to assign features. */ 784 chars_len = 0; 785 for (unsigned int i = 0; i < buffer->len; i++) 786 { 787 hb_codepoint_t c = buffer->info[i].codepoint; 788 unsigned int cluster = buffer->info[i].cluster; 789 log_clusters[chars_len++] = cluster; 790 if (hb_in_range (c, 0x10000u, 0x10FFFFu)) 791 log_clusters[chars_len++] = cluster; /* Surrogates. */ 792 } 793 } 794 795 /* The -2 in the following is to compensate for possible 796 * alignment needed after the WORD array. sizeof(WORD) == 2. */ 797 unsigned int glyphs_size = (scratch_size * sizeof (int) - 2) 798 / (sizeof (WORD) + 799 sizeof (SCRIPT_GLYPHPROP) + 800 sizeof (int) + 801 sizeof (GOFFSET) + 802 sizeof (uint32_t)); 803 804 ALLOCATE_ARRAY (WORD, glyphs, glyphs_size); 805 ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size); 806 ALLOCATE_ARRAY (int, advances, glyphs_size); 807 ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size); 808 ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size); 809 810 /* Note: 811 * We can't touch the contents of glyph_props. Our fallback 812 * implementations of Shape and Place functions use that buffer 813 * by casting it to a different type. It works because they 814 * both agree about it, but if we want to access it here we 815 * need address that issue first. 816 */ 817 818 #undef ALLOCATE_ARRAY 819 820 #define MAX_ITEMS 256 821 822 SCRIPT_ITEM items[MAX_ITEMS + 1]; 823 SCRIPT_CONTROL bidi_control = {0}; 824 SCRIPT_STATE bidi_state = {0}; 825 ULONG script_tags[MAX_ITEMS]; 826 int item_count; 827 828 /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */ 829 //bidi_control.fMergeNeutralItems = true; 830 *(uint32_t*)&bidi_control |= 1<<24; 831 832 bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; 833 bidi_state.fOverrideDirection = 1; 834 835 hr = funcs->ScriptItemizeOpenType (pchars, 836 chars_len, 837 MAX_ITEMS, 838 &bidi_control, 839 &bidi_state, 840 items, 841 script_tags, 842 &item_count); 843 if (unlikely (FAILED (hr))) 844 FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr); 845 846 #undef MAX_ITEMS 847 848 OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language)); 849 hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties; 850 hb_auto_array_t<int> range_char_counts; 851 852 unsigned int glyphs_offset = 0; 853 unsigned int glyphs_len; 854 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); 855 for (unsigned int i = 0; i < item_count; i++) 856 { 857 unsigned int chars_offset = items[i].iCharPos; 858 unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset; 859 860 if (num_features) 861 { 862 range_properties.shrink (0); 863 range_char_counts.shrink (0); 864 865 range_record_t *last_range = &range_records[0]; 866 867 for (unsigned int k = chars_offset; k < chars_offset + item_chars_len; k++) 868 { 869 range_record_t *range = last_range; 870 while (log_clusters[k] < range->index_first) 871 range--; 872 while (log_clusters[k] > range->index_last) 873 range++; 874 if (!range_properties.len || 875 &range->props != range_properties[range_properties.len - 1]) 876 { 877 TEXTRANGE_PROPERTIES **props = range_properties.push (); 878 int *c = range_char_counts.push (); 879 if (unlikely (!props || !c)) 880 { 881 range_properties.shrink (0); 882 range_char_counts.shrink (0); 883 break; 884 } 885 *props = &range->props; 886 *c = 1; 887 } 888 else 889 { 890 range_char_counts[range_char_counts.len - 1]++; 891 } 892 893 last_range = range; 894 } 895 } 896 897 /* Asking for glyphs in logical order circumvents at least 898 * one bug in Uniscribe. */ 899 items[i].a.fLogicalOrder = true; 900 901 retry_shape: 902 hr = funcs->ScriptShapeOpenType (font_data->hdc, 903 &font_data->script_cache, 904 &items[i].a, 905 script_tags[i], 906 language_tag, 907 range_char_counts.array, 908 range_properties.array, 909 range_properties.len, 910 pchars + chars_offset, 911 item_chars_len, 912 glyphs_size - glyphs_offset, 913 /* out */ 914 log_clusters + chars_offset, 915 char_props + chars_offset, 916 glyphs + glyphs_offset, 917 glyph_props + glyphs_offset, 918 (int *) &glyphs_len); 919 920 if (unlikely (items[i].a.fNoGlyphIndex)) 921 FAIL ("ScriptShapeOpenType() set fNoGlyphIndex"); 922 if (unlikely (hr == E_OUTOFMEMORY || hr == E_NOT_SUFFICIENT_BUFFER)) 923 { 924 if (unlikely (!buffer->ensure (buffer->allocated * 2))) 925 FAIL ("Buffer resize failed"); 926 goto retry; 927 } 928 if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT)) 929 { 930 if (items[i].a.eScript == SCRIPT_UNDEFINED) 931 FAIL ("ScriptShapeOpenType() failed: Font doesn't support script"); 932 items[i].a.eScript = SCRIPT_UNDEFINED; 933 goto retry_shape; 934 } 935 if (unlikely (FAILED (hr))) 936 { 937 FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr); 938 } 939 940 for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++) 941 log_clusters[j] += glyphs_offset; 942 943 hr = funcs->ScriptPlaceOpenType (font_data->hdc, 944 &font_data->script_cache, 945 &items[i].a, 946 script_tags[i], 947 language_tag, 948 range_char_counts.array, 949 range_properties.array, 950 range_properties.len, 951 pchars + chars_offset, 952 log_clusters + chars_offset, 953 char_props + chars_offset, 954 item_chars_len, 955 glyphs + glyphs_offset, 956 glyph_props + glyphs_offset, 957 glyphs_len, 958 /* out */ 959 advances + glyphs_offset, 960 offsets + glyphs_offset, 961 NULL); 962 if (unlikely (FAILED (hr))) 963 FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr); 964 965 if (DEBUG_ENABLED (UNISCRIBE)) 966 fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n", 967 i, 968 items[i].a.fRTL, 969 items[i].a.fLayoutRTL, 970 items[i].a.fLogicalOrder, 971 HB_UNTAG (hb_uint32_swap (script_tags[i]))); 972 973 glyphs_offset += glyphs_len; 974 } 975 glyphs_len = glyphs_offset; 976 977 /* Ok, we've got everything we need, now compose output buffer, 978 * very, *very*, carefully! */ 979 980 /* Calculate visual-clusters. That's what we ship. */ 981 for (unsigned int i = 0; i < glyphs_len; i++) 982 vis_clusters[i] = -1; 983 for (unsigned int i = 0; i < buffer->len; i++) { 984 uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]]; 985 *p = MIN (*p, buffer->info[i].cluster); 986 } 987 for (unsigned int i = 1; i < glyphs_len; i++) 988 if (vis_clusters[i] == -1) 989 vis_clusters[i] = vis_clusters[i - 1]; 990 991 #undef utf16_index 992 993 if (unlikely (!buffer->ensure (glyphs_len))) 994 FAIL ("Buffer in error"); 995 996 #undef FAIL 997 998 /* Set glyph infos */ 999 buffer->len = 0; 1000 for (unsigned int i = 0; i < glyphs_len; i++) 1001 { 1002 hb_glyph_info_t *info = &buffer->info[buffer->len++]; 1003 1004 info->codepoint = glyphs[i]; 1005 info->cluster = vis_clusters[i]; 1006 1007 /* The rest is crap. Let's store position info there for now. */ 1008 info->mask = advances[i]; 1009 info->var1.i32 = offsets[i].du; 1010 info->var2.i32 = offsets[i].dv; 1011 } 1012 1013 /* Set glyph positions */ 1014 buffer->clear_positions (); 1015 double x_mult = font_data->x_mult, y_mult = font_data->y_mult; 1016 for (unsigned int i = 0; i < glyphs_len; i++) 1017 { 1018 hb_glyph_info_t *info = &buffer->info[i]; 1019 hb_glyph_position_t *pos = &buffer->pos[i]; 1020 1021 /* TODO vertical */ 1022 pos->x_advance = x_mult * (int32_t) info->mask; 1023 pos->x_offset = x_mult * (backward ? -info->var1.i32 : info->var1.i32); 1024 pos->y_offset = y_mult * info->var2.i32; 1025 } 1026 1027 if (backward) 1028 hb_buffer_reverse (buffer); 1029 1030 /* Wow, done! */ 1031 return true; 1032 } 1033 1034 1035
