1 /* 2 * Copyright 2006 The Android Open Source Project 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkAdvancedTypefaceMetrics.h" 9 #include "SkBitmap.h" 10 #include "SkCanvas.h" 11 #include "SkColorPriv.h" 12 #include "SkDescriptor.h" 13 #include "SkFDot6.h" 14 #include "SkFontDescriptor.h" 15 #include "SkFontHost_FreeType_common.h" 16 #include "SkGlyph.h" 17 #include "SkMask.h" 18 #include "SkMaskGamma.h" 19 #include "SkMatrix22.h" 20 #include "SkMutex.h" 21 #include "SkOTUtils.h" 22 #include "SkPath.h" 23 #include "SkScalerContext.h" 24 #include "SkStream.h" 25 #include "SkString.h" 26 #include "SkTemplates.h" 27 #include "SkTypes.h" 28 #include "SkUniquePtr.h" 29 30 #if defined(SK_CAN_USE_DLOPEN) 31 #include <dlfcn.h> 32 #endif 33 #include <ft2build.h> 34 #include FT_ADVANCES_H 35 #include FT_BITMAP_H 36 #include FT_FREETYPE_H 37 #include FT_LCD_FILTER_H 38 #include FT_MODULE_H 39 #include FT_MULTIPLE_MASTERS_H 40 #include FT_OUTLINE_H 41 #include FT_SIZES_H 42 #include FT_SYSTEM_H 43 #include FT_TRUETYPE_TABLES_H 44 #include FT_TYPE1_TABLES_H 45 #include FT_XFREE86_H 46 47 // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA 48 // were introduced in FreeType 2.5.0. 49 // The following may be removed once FreeType 2.5.0 is required to build. 50 #ifndef FT_LOAD_COLOR 51 # define FT_LOAD_COLOR ( 1L << 20 ) 52 # define FT_PIXEL_MODE_BGRA 7 53 #endif 54 55 //#define ENABLE_GLYPH_SPEW // for tracing calls 56 //#define DUMP_STRIKE_CREATION 57 //#define SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER 58 //#define SK_FONTHOST_FREETYPE_RUNTIME_VERSION 59 //#define SK_GAMMA_APPLY_TO_A8 60 61 using namespace skia_advanced_typeface_metrics_utils; 62 63 static bool isLCD(const SkScalerContext::Rec& rec) { 64 return SkMask::kLCD16_Format == rec.fMaskFormat; 65 } 66 67 ////////////////////////////////////////////////////////////////////////// 68 69 extern "C" { 70 static void* sk_ft_alloc(FT_Memory, long size) { 71 return sk_malloc_throw(size); 72 } 73 static void sk_ft_free(FT_Memory, void* block) { 74 sk_free(block); 75 } 76 static void* sk_ft_realloc(FT_Memory, long cur_size, long new_size, void* block) { 77 return sk_realloc_throw(block, new_size); 78 } 79 }; 80 FT_MemoryRec_ gFTMemory = { nullptr, sk_ft_alloc, sk_ft_free, sk_ft_realloc }; 81 82 class FreeTypeLibrary : SkNoncopyable { 83 public: 84 FreeTypeLibrary() : fLibrary(nullptr), fIsLCDSupported(false), fLCDExtra(0) { 85 if (FT_New_Library(&gFTMemory, &fLibrary)) { 86 return; 87 } 88 FT_Add_Default_Modules(fLibrary); 89 90 // Setup LCD filtering. This reduces color fringes for LCD smoothed glyphs. 91 // Default { 0x10, 0x40, 0x70, 0x40, 0x10 } adds up to 0x110, simulating ink spread. 92 // SetLcdFilter must be called before SetLcdFilterWeights. 93 if (FT_Library_SetLcdFilter(fLibrary, FT_LCD_FILTER_DEFAULT) == 0) { 94 fIsLCDSupported = true; 95 fLCDExtra = 2; //Using a filter adds one full pixel to each side. 96 97 #ifdef SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER 98 // Adds to 0x110 simulating ink spread, but provides better results than default. 99 static unsigned char gGaussianLikeHeavyWeights[] = { 0x1A, 0x43, 0x56, 0x43, 0x1A, }; 100 101 # if SK_FONTHOST_FREETYPE_RUNTIME_VERSION > 0x020400 102 FT_Library_SetLcdFilterWeights(fLibrary, gGaussianLikeHeavyWeights); 103 # elif SK_CAN_USE_DLOPEN == 1 104 //The FreeType library is already loaded, so symbols are available in process. 105 void* self = dlopen(nullptr, RTLD_LAZY); 106 if (self) { 107 FT_Library_SetLcdFilterWeightsProc setLcdFilterWeights; 108 //The following cast is non-standard, but safe for POSIX. 109 *reinterpret_cast<void**>(&setLcdFilterWeights) = 110 dlsym(self, "FT_Library_SetLcdFilterWeights"); 111 dlclose(self); 112 113 if (setLcdFilterWeights) { 114 setLcdFilterWeights(fLibrary, gGaussianLikeHeavyWeights); 115 } 116 } 117 # endif 118 #endif 119 } 120 } 121 ~FreeTypeLibrary() { 122 if (fLibrary) { 123 FT_Done_Library(fLibrary); 124 } 125 } 126 127 FT_Library library() { return fLibrary; } 128 bool isLCDSupported() { return fIsLCDSupported; } 129 int lcdExtra() { return fLCDExtra; } 130 131 private: 132 FT_Library fLibrary; 133 bool fIsLCDSupported; 134 int fLCDExtra; 135 136 // FT_Library_SetLcdFilterWeights was introduced in FreeType 2.4.0. 137 // The following platforms provide FreeType of at least 2.4.0. 138 // Ubuntu >= 11.04 (previous deprecated April 2013) 139 // Debian >= 6.0 (good) 140 // OpenSuse >= 11.4 (previous deprecated January 2012 / Nov 2013 for Evergreen 11.2) 141 // Fedora >= 14 (good) 142 // Android >= Gingerbread (good) 143 typedef FT_Error (*FT_Library_SetLcdFilterWeightsProc)(FT_Library, unsigned char*); 144 }; 145 146 struct SkFaceRec; 147 148 SK_DECLARE_STATIC_MUTEX(gFTMutex); 149 static FreeTypeLibrary* gFTLibrary; 150 static SkFaceRec* gFaceRecHead; 151 152 // Private to ref_ft_library and unref_ft_library 153 static int gFTCount; 154 155 // Caller must lock gFTMutex before calling this function. 156 static bool ref_ft_library() { 157 gFTMutex.assertHeld(); 158 SkASSERT(gFTCount >= 0); 159 160 if (0 == gFTCount) { 161 SkASSERT(nullptr == gFTLibrary); 162 gFTLibrary = new FreeTypeLibrary; 163 } 164 ++gFTCount; 165 return gFTLibrary->library(); 166 } 167 168 // Caller must lock gFTMutex before calling this function. 169 static void unref_ft_library() { 170 gFTMutex.assertHeld(); 171 SkASSERT(gFTCount > 0); 172 173 --gFTCount; 174 if (0 == gFTCount) { 175 SkASSERT(nullptr == gFaceRecHead); 176 SkASSERT(nullptr != gFTLibrary); 177 delete gFTLibrary; 178 SkDEBUGCODE(gFTLibrary = nullptr;) 179 } 180 } 181 182 class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { 183 public: 184 SkScalerContext_FreeType(SkTypeface*, const SkDescriptor* desc); 185 virtual ~SkScalerContext_FreeType(); 186 187 bool success() const { 188 return fFTSize != nullptr && fFace != nullptr; 189 } 190 191 protected: 192 unsigned generateGlyphCount() override; 193 uint16_t generateCharToGlyph(SkUnichar uni) override; 194 void generateAdvance(SkGlyph* glyph) override; 195 void generateMetrics(SkGlyph* glyph) override; 196 void generateImage(const SkGlyph& glyph) override; 197 void generatePath(const SkGlyph& glyph, SkPath* path) override; 198 void generateFontMetrics(SkPaint::FontMetrics*) override; 199 SkUnichar generateGlyphToChar(uint16_t glyph) override; 200 201 private: 202 FT_Face fFace; // reference to shared face in gFaceRecHead 203 FT_Size fFTSize; // our own copy 204 FT_Int fStrikeIndex; 205 FT_F26Dot6 fScaleX, fScaleY; 206 FT_Matrix fMatrix22; 207 uint32_t fLoadGlyphFlags; 208 bool fDoLinearMetrics; 209 bool fLCDIsVert; 210 211 // Need scalar versions for generateFontMetrics 212 SkVector fScale; 213 SkMatrix fMatrix22Scalar; 214 215 FT_Error setupSize(); 216 void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, 217 bool snapToPixelBoundary = false); 218 bool getCBoxForLetter(char letter, FT_BBox* bbox); 219 // Caller must lock gFTMutex before calling this function. 220 void updateGlyphIfLCD(SkGlyph* glyph); 221 // Caller must lock gFTMutex before calling this function. 222 // update FreeType2 glyph slot with glyph emboldened 223 void emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph); 224 }; 225 226 /////////////////////////////////////////////////////////////////////////// 227 /////////////////////////////////////////////////////////////////////////// 228 229 struct SkFaceRec { 230 SkFaceRec* fNext; 231 FT_Face fFace; 232 FT_StreamRec fFTStream; 233 SkAutoTDelete<SkStreamAsset> fSkStream; 234 uint32_t fRefCnt; 235 uint32_t fFontID; 236 237 // assumes ownership of the stream, will delete when its done 238 SkFaceRec(SkStreamAsset* strm, uint32_t fontID); 239 }; 240 241 extern "C" { 242 static unsigned long sk_ft_stream_io(FT_Stream ftStream, 243 unsigned long offset, 244 unsigned char* buffer, 245 unsigned long count) 246 { 247 SkStreamAsset* stream = static_cast<SkStreamAsset*>(ftStream->descriptor.pointer); 248 249 if (count) { 250 if (!stream->seek(offset)) { 251 return 0; 252 } 253 count = stream->read(buffer, count); 254 } 255 return count; 256 } 257 258 static void sk_ft_stream_close(FT_Stream) {} 259 } 260 261 SkFaceRec::SkFaceRec(SkStreamAsset* stream, uint32_t fontID) 262 : fNext(nullptr), fSkStream(stream), fRefCnt(1), fFontID(fontID) 263 { 264 sk_bzero(&fFTStream, sizeof(fFTStream)); 265 fFTStream.size = fSkStream->getLength(); 266 fFTStream.descriptor.pointer = fSkStream; 267 fFTStream.read = sk_ft_stream_io; 268 fFTStream.close = sk_ft_stream_close; 269 } 270 271 static void ft_face_setup_axes(FT_Face face, const SkFontData& data) { 272 if (!(face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) { 273 return; 274 } 275 276 SkDEBUGCODE( 277 FT_MM_Var* variations = nullptr; 278 if (FT_Get_MM_Var(face, &variations)) { 279 SkDEBUGF(("INFO: font %s claims variations, but none found.\n", face->family_name)); 280 return; 281 } 282 SkAutoFree autoFreeVariations(variations); 283 284 if (static_cast<FT_UInt>(data.getAxisCount()) != variations->num_axis) { 285 SkDEBUGF(("INFO: font %s has %d variations, but %d were specified.\n", 286 face->family_name, variations->num_axis, data.getAxisCount())); 287 return; 288 } 289 ) 290 291 SkAutoSTMalloc<4, FT_Fixed> coords(data.getAxisCount()); 292 for (int i = 0; i < data.getAxisCount(); ++i) { 293 coords[i] = data.getAxis()[i]; 294 } 295 if (FT_Set_Var_Design_Coordinates(face, data.getAxisCount(), coords.get())) { 296 SkDEBUGF(("INFO: font %s has variations, but specified variations could not be set.\n", 297 face->family_name)); 298 return; 299 } 300 } 301 302 // Will return 0 on failure 303 // Caller must lock gFTMutex before calling this function. 304 static FT_Face ref_ft_face(const SkTypeface* typeface) { 305 gFTMutex.assertHeld(); 306 307 const SkFontID fontID = typeface->uniqueID(); 308 SkFaceRec* rec = gFaceRecHead; 309 while (rec) { 310 if (rec->fFontID == fontID) { 311 SkASSERT(rec->fFace); 312 rec->fRefCnt += 1; 313 return rec->fFace; 314 } 315 rec = rec->fNext; 316 } 317 318 SkAutoTDelete<SkFontData> data(typeface->createFontData()); 319 if (nullptr == data || !data->hasStream()) { 320 return nullptr; 321 } 322 323 // this passes ownership of stream to the rec 324 rec = new SkFaceRec(data->detachStream(), fontID); 325 326 FT_Open_Args args; 327 memset(&args, 0, sizeof(args)); 328 const void* memoryBase = rec->fSkStream->getMemoryBase(); 329 if (memoryBase) { 330 args.flags = FT_OPEN_MEMORY; 331 args.memory_base = (const FT_Byte*)memoryBase; 332 args.memory_size = rec->fSkStream->getLength(); 333 } else { 334 args.flags = FT_OPEN_STREAM; 335 args.stream = &rec->fFTStream; 336 } 337 338 FT_Error err = FT_Open_Face(gFTLibrary->library(), &args, data->getIndex(), &rec->fFace); 339 if (err) { 340 SkDEBUGF(("ERROR: unable to open font '%x'\n", fontID)); 341 delete rec; 342 return nullptr; 343 } 344 SkASSERT(rec->fFace); 345 346 ft_face_setup_axes(rec->fFace, *data); 347 348 // FreeType will set the charmap to the "most unicode" cmap if it exists. 349 // If there are no unicode cmaps, the charmap is set to nullptr. 350 // However, "symbol" cmaps should also be considered "fallback unicode" cmaps 351 // because they are effectively private use area only (even if they aren't). 352 // This is the last on the fallback list at 353 // https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html 354 if (!rec->fFace->charmap) { 355 FT_Select_Charmap(rec->fFace, FT_ENCODING_MS_SYMBOL); 356 } 357 358 rec->fNext = gFaceRecHead; 359 gFaceRecHead = rec; 360 return rec->fFace; 361 } 362 363 // Caller must lock gFTMutex before calling this function. 364 static void unref_ft_face(FT_Face face) { 365 gFTMutex.assertHeld(); 366 367 SkFaceRec* rec = gFaceRecHead; 368 SkFaceRec* prev = nullptr; 369 while (rec) { 370 SkFaceRec* next = rec->fNext; 371 if (rec->fFace == face) { 372 if (--rec->fRefCnt == 0) { 373 if (prev) { 374 prev->fNext = next; 375 } else { 376 gFaceRecHead = next; 377 } 378 FT_Done_Face(face); 379 delete rec; 380 } 381 return; 382 } 383 prev = rec; 384 rec = next; 385 } 386 SkDEBUGFAIL("shouldn't get here, face not in list"); 387 } 388 389 class AutoFTAccess { 390 public: 391 AutoFTAccess(const SkTypeface* tf) : fFace(nullptr) { 392 gFTMutex.acquire(); 393 if (!ref_ft_library()) { 394 sk_throw(); 395 } 396 fFace = ref_ft_face(tf); 397 } 398 399 ~AutoFTAccess() { 400 if (fFace) { 401 unref_ft_face(fFace); 402 } 403 unref_ft_library(); 404 gFTMutex.release(); 405 } 406 407 FT_Face face() { return fFace; } 408 409 private: 410 FT_Face fFace; 411 }; 412 413 /////////////////////////////////////////////////////////////////////////// 414 415 static bool canEmbed(FT_Face face) { 416 FT_UShort fsType = FT_Get_FSType_Flags(face); 417 return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | 418 FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; 419 } 420 421 static bool canSubset(FT_Face face) { 422 FT_UShort fsType = FT_Get_FSType_Flags(face); 423 return (fsType & FT_FSTYPE_NO_SUBSETTING) == 0; 424 } 425 426 static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { 427 const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); 428 if (!glyph_id) 429 return false; 430 if (FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE) != 0) 431 return false; 432 FT_Outline_Get_CBox(&face->glyph->outline, bbox); 433 return true; 434 } 435 436 static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { 437 FT_Fixed advance = 0; 438 if (FT_Get_Advances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { 439 return false; 440 } 441 SkASSERT(data); 442 *data = advance; 443 return true; 444 } 445 446 static void populate_glyph_to_unicode(FT_Face& face, SkTDArray<SkUnichar>* glyphToUnicode) { 447 glyphToUnicode->setCount(face->num_glyphs); 448 sk_bzero(glyphToUnicode->begin(), sizeof((*glyphToUnicode)[0]) * face->num_glyphs); 449 450 FT_UInt glyphIndex; 451 SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); 452 while (glyphIndex) { 453 (*glyphToUnicode)[glyphIndex] = charCode; 454 charCode = FT_Get_Next_Char(face, charCode, &glyphIndex); 455 } 456 } 457 458 SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics( 459 PerGlyphInfo perGlyphInfo, 460 const uint32_t* glyphIDs, 461 uint32_t glyphIDsCount) const { 462 #if defined(SK_BUILD_FOR_MAC) 463 return nullptr; 464 #else 465 AutoFTAccess fta(this); 466 FT_Face face = fta.face(); 467 if (!face) { 468 return nullptr; 469 } 470 471 SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; 472 info->fFontName.set(FT_Get_Postscript_Name(face)); 473 info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag; 474 if (FT_HAS_MULTIPLE_MASTERS(face)) { 475 info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( 476 info->fFlags, SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag); 477 } 478 if (!canEmbed(face)) { 479 info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( 480 info->fFlags, 481 SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag); 482 } 483 if (!canSubset(face)) { 484 info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( 485 info->fFlags, 486 SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag); 487 } 488 info->fLastGlyphID = face->num_glyphs - 1; 489 info->fEmSize = 1000; 490 491 bool cid = false; 492 const char* fontType = FT_Get_X11_Font_Format(face); 493 if (strcmp(fontType, "Type 1") == 0) { 494 info->fType = SkAdvancedTypefaceMetrics::kType1_Font; 495 } else if (strcmp(fontType, "CID Type 1") == 0) { 496 info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; 497 cid = true; 498 } else if (strcmp(fontType, "CFF") == 0) { 499 info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; 500 } else if (strcmp(fontType, "TrueType") == 0) { 501 info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; 502 cid = true; 503 TT_Header* ttHeader; 504 if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, 505 ft_sfnt_head)) != nullptr) { 506 info->fEmSize = ttHeader->Units_Per_EM; 507 } 508 } else { 509 info->fType = SkAdvancedTypefaceMetrics::kOther_Font; 510 } 511 512 info->fStyle = 0; 513 if (FT_IS_FIXED_WIDTH(face)) 514 info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; 515 if (face->style_flags & FT_STYLE_FLAG_ITALIC) 516 info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; 517 518 PS_FontInfoRec ps_info; 519 TT_Postscript* tt_info; 520 if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { 521 info->fItalicAngle = ps_info.italic_angle; 522 } else if ((tt_info = 523 (TT_Postscript*)FT_Get_Sfnt_Table(face, 524 ft_sfnt_post)) != nullptr) { 525 info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); 526 } else { 527 info->fItalicAngle = 0; 528 } 529 530 info->fAscent = face->ascender; 531 info->fDescent = face->descender; 532 533 // Figure out a good guess for StemV - Min width of i, I, !, 1. 534 // This probably isn't very good with an italic font. 535 int16_t min_width = SHRT_MAX; 536 info->fStemV = 0; 537 char stem_chars[] = {'i', 'I', '!', '1'}; 538 for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { 539 FT_BBox bbox; 540 if (GetLetterCBox(face, stem_chars[i], &bbox)) { 541 int16_t width = bbox.xMax - bbox.xMin; 542 if (width > 0 && width < min_width) { 543 min_width = width; 544 info->fStemV = min_width; 545 } 546 } 547 } 548 549 TT_PCLT* pclt_info; 550 TT_OS2* os2_table; 551 if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != nullptr) { 552 info->fCapHeight = pclt_info->CapHeight; 553 uint8_t serif_style = pclt_info->SerifStyle & 0x3F; 554 if (serif_style >= 2 && serif_style <= 6) 555 info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; 556 else if (serif_style >= 9 && serif_style <= 12) 557 info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; 558 } else if (((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != nullptr) && 559 // sCapHeight is available only when version 2 or later. 560 os2_table->version != 0xFFFF && 561 os2_table->version >= 2) { 562 info->fCapHeight = os2_table->sCapHeight; 563 } else { 564 // Figure out a good guess for CapHeight: average the height of M and X. 565 FT_BBox m_bbox, x_bbox; 566 bool got_m, got_x; 567 got_m = GetLetterCBox(face, 'M', &m_bbox); 568 got_x = GetLetterCBox(face, 'X', &x_bbox); 569 if (got_m && got_x) { 570 info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - 571 x_bbox.yMin) / 2; 572 } else if (got_m && !got_x) { 573 info->fCapHeight = m_bbox.yMax - m_bbox.yMin; 574 } else if (!got_m && got_x) { 575 info->fCapHeight = x_bbox.yMax - x_bbox.yMin; 576 } else { 577 // Last resort, use the ascent. 578 info->fCapHeight = info->fAscent; 579 } 580 } 581 582 info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, 583 face->bbox.xMax, face->bbox.yMin); 584 585 if (!FT_IS_SCALABLE(face)) { 586 perGlyphInfo = kNo_PerGlyphInfo; 587 } 588 589 if (perGlyphInfo & kHAdvance_PerGlyphInfo) { 590 if (FT_IS_FIXED_WIDTH(face)) { 591 appendRange(&info->fGlyphWidths, 0); 592 int16_t advance = face->max_advance_width; 593 info->fGlyphWidths->fAdvance.append(1, &advance); 594 finishRange(info->fGlyphWidths.get(), 0, 595 SkAdvancedTypefaceMetrics::WidthRange::kDefault); 596 } else if (!cid) { 597 appendRange(&info->fGlyphWidths, 0); 598 // So as to not blow out the stack, get advances in batches. 599 for (int gID = 0; gID < face->num_glyphs; gID += 128) { 600 FT_Fixed advances[128]; 601 int advanceCount = 128; 602 if (gID + advanceCount > face->num_glyphs) { 603 advanceCount = face->num_glyphs - gID; 604 } 605 FT_Get_Advances(face, gID, advanceCount, FT_LOAD_NO_SCALE, advances); 606 for (int i = 0; i < advanceCount; i++) { 607 int16_t advance = advances[i]; 608 info->fGlyphWidths->fAdvance.append(1, &advance); 609 } 610 } 611 finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, 612 SkAdvancedTypefaceMetrics::WidthRange::kRange); 613 } else { 614 info->fGlyphWidths.reset( 615 getAdvanceData(face, 616 face->num_glyphs, 617 glyphIDs, 618 glyphIDsCount, 619 &getWidthAdvance)); 620 } 621 } 622 623 if (perGlyphInfo & kVAdvance_PerGlyphInfo && 624 FT_HAS_VERTICAL(face)) { 625 SkASSERT(false); // Not implemented yet. 626 } 627 628 if (perGlyphInfo & kGlyphNames_PerGlyphInfo && 629 info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { 630 // Postscript fonts may contain more than 255 glyphs, so we end up 631 // using multiple font descriptions with a glyph ordering. Record 632 // the name of each glyph. 633 info->fGlyphNames.reset( 634 new SkAutoTArray<SkString>(face->num_glyphs)); 635 for (int gID = 0; gID < face->num_glyphs; gID++) { 636 char glyphName[128]; // PS limit for names is 127 bytes. 637 FT_Get_Glyph_Name(face, gID, glyphName, 128); 638 info->fGlyphNames->get()[gID].set(glyphName); 639 } 640 } 641 642 if (perGlyphInfo & kToUnicode_PerGlyphInfo && 643 info->fType != SkAdvancedTypefaceMetrics::kType1_Font && 644 face->num_charmaps) { 645 populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); 646 } 647 648 return info; 649 #endif 650 } 651 652 /////////////////////////////////////////////////////////////////////////// 653 654 static bool bothZero(SkScalar a, SkScalar b) { 655 return 0 == a && 0 == b; 656 } 657 658 // returns false if there is any non-90-rotation or skew 659 static bool isAxisAligned(const SkScalerContext::Rec& rec) { 660 return 0 == rec.fPreSkewX && 661 (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || 662 bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); 663 } 664 665 SkScalerContext* SkTypeface_FreeType::onCreateScalerContext( 666 const SkDescriptor* desc) const { 667 SkScalerContext_FreeType* c = 668 new SkScalerContext_FreeType(const_cast<SkTypeface_FreeType*>(this), desc); 669 if (!c->success()) { 670 delete c; 671 c = nullptr; 672 } 673 return c; 674 } 675 676 void SkTypeface_FreeType::onFilterRec(SkScalerContextRec* rec) const { 677 //BOGUS: http://code.google.com/p/chromium/issues/detail?id=121119 678 //Cap the requested size as larger sizes give bogus values. 679 //Remove when http://code.google.com/p/skia/issues/detail?id=554 is fixed. 680 //Note that this also currently only protects against large text size requests, 681 //the total matrix is not taken into account here. 682 if (rec->fTextSize > SkIntToScalar(1 << 14)) { 683 rec->fTextSize = SkIntToScalar(1 << 14); 684 } 685 686 if (isLCD(*rec)) { 687 // TODO: re-work so that FreeType is set-up and selected by the SkFontMgr. 688 SkAutoMutexAcquire ama(gFTMutex); 689 ref_ft_library(); 690 if (!gFTLibrary->isLCDSupported()) { 691 // If the runtime Freetype library doesn't support LCD, disable it here. 692 rec->fMaskFormat = SkMask::kA8_Format; 693 } 694 unref_ft_library(); 695 } 696 697 SkPaint::Hinting h = rec->getHinting(); 698 if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { 699 // collapse full->normal hinting if we're not doing LCD 700 h = SkPaint::kNormal_Hinting; 701 } 702 if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag)) { 703 if (SkPaint::kNo_Hinting != h) { 704 h = SkPaint::kSlight_Hinting; 705 } 706 } 707 708 // rotated text looks bad with hinting, so we disable it as needed 709 if (!isAxisAligned(*rec)) { 710 h = SkPaint::kNo_Hinting; 711 } 712 rec->setHinting(h); 713 714 #ifndef SK_GAMMA_APPLY_TO_A8 715 if (!isLCD(*rec)) { 716 rec->ignorePreBlend(); 717 } 718 #endif 719 } 720 721 int SkTypeface_FreeType::onGetUPEM() const { 722 AutoFTAccess fta(this); 723 FT_Face face = fta.face(); 724 return face ? face->units_per_EM : 0; 725 } 726 727 bool SkTypeface_FreeType::onGetKerningPairAdjustments(const uint16_t glyphs[], 728 int count, int32_t adjustments[]) const { 729 AutoFTAccess fta(this); 730 FT_Face face = fta.face(); 731 if (!face || !FT_HAS_KERNING(face)) { 732 return false; 733 } 734 735 for (int i = 0; i < count - 1; ++i) { 736 FT_Vector delta; 737 FT_Error err = FT_Get_Kerning(face, glyphs[i], glyphs[i+1], 738 FT_KERNING_UNSCALED, &delta); 739 if (err) { 740 return false; 741 } 742 adjustments[i] = delta.x; 743 } 744 return true; 745 } 746 747 static FT_Int chooseBitmapStrike(FT_Face face, FT_F26Dot6 scaleY) { 748 // early out if face is bad 749 if (face == nullptr) { 750 SkDEBUGF(("chooseBitmapStrike aborted due to nullptr face\n")); 751 return -1; 752 } 753 // determine target ppem 754 FT_Pos targetPPEM = scaleY; 755 // find a bitmap strike equal to or just larger than the requested size 756 FT_Int chosenStrikeIndex = -1; 757 FT_Pos chosenPPEM = 0; 758 for (FT_Int strikeIndex = 0; strikeIndex < face->num_fixed_sizes; ++strikeIndex) { 759 FT_Pos thisPPEM = face->available_sizes[strikeIndex].y_ppem; 760 if (thisPPEM == targetPPEM) { 761 // exact match - our search stops here 762 chosenPPEM = thisPPEM; 763 chosenStrikeIndex = strikeIndex; 764 break; 765 } else if (chosenPPEM < targetPPEM) { 766 // attempt to increase chosenPPEM 767 if (thisPPEM > chosenPPEM) { 768 chosenPPEM = thisPPEM; 769 chosenStrikeIndex = strikeIndex; 770 } 771 } else { 772 // attempt to decrease chosenPPEM, but not below targetPPEM 773 if (thisPPEM < chosenPPEM && thisPPEM > targetPPEM) { 774 chosenPPEM = thisPPEM; 775 chosenStrikeIndex = strikeIndex; 776 } 777 } 778 } 779 if (chosenStrikeIndex != -1) { 780 // use the chosen strike 781 FT_Error err = FT_Select_Size(face, chosenStrikeIndex); 782 if (err != 0) { 783 SkDEBUGF(("FT_Select_Size(%s, %d) returned 0x%x\n", face->family_name, 784 chosenStrikeIndex, err)); 785 chosenStrikeIndex = -1; 786 } 787 } 788 return chosenStrikeIndex; 789 } 790 791 SkScalerContext_FreeType::SkScalerContext_FreeType(SkTypeface* typeface, const SkDescriptor* desc) 792 : SkScalerContext_FreeType_Base(typeface, desc) 793 , fFace(nullptr) 794 , fFTSize(nullptr) 795 , fStrikeIndex(-1) 796 { 797 SkAutoMutexAcquire ac(gFTMutex); 798 799 if (!ref_ft_library()) { 800 sk_throw(); 801 } 802 803 // load the font file 804 using UnrefFTFace = SkFunctionWrapper<void, skstd::remove_pointer_t<FT_Face>, unref_ft_face>; 805 skstd::unique_ptr<skstd::remove_pointer_t<FT_Face>, UnrefFTFace> ftFace(ref_ft_face(typeface)); 806 if (nullptr == ftFace) { 807 SkDEBUGF(("Could not create FT_Face.\n")); 808 return; 809 } 810 811 fRec.computeMatrices(SkScalerContextRec::kFull_PreMatrixScale, &fScale, &fMatrix22Scalar); 812 fMatrix22Scalar.setSkewX(-fMatrix22Scalar.getSkewX()); 813 fMatrix22Scalar.setSkewY(-fMatrix22Scalar.getSkewY()); 814 815 fScaleX = SkScalarToFDot6(fScale.fX); 816 fScaleY = SkScalarToFDot6(fScale.fY); 817 fMatrix22.xx = SkScalarToFixed(fMatrix22Scalar.getScaleX()); 818 fMatrix22.xy = SkScalarToFixed(fMatrix22Scalar.getSkewX()); 819 fMatrix22.yx = SkScalarToFixed(fMatrix22Scalar.getSkewY()); 820 fMatrix22.yy = SkScalarToFixed(fMatrix22Scalar.getScaleY()); 821 822 fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); 823 824 // compute the flags we send to Load_Glyph 825 bool linearMetrics = SkToBool(fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag); 826 { 827 FT_Int32 loadFlags = FT_LOAD_DEFAULT; 828 829 if (SkMask::kBW_Format == fRec.fMaskFormat) { 830 // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 831 loadFlags = FT_LOAD_TARGET_MONO; 832 if (fRec.getHinting() == SkPaint::kNo_Hinting) { 833 loadFlags = FT_LOAD_NO_HINTING; 834 linearMetrics = true; 835 } 836 } else { 837 switch (fRec.getHinting()) { 838 case SkPaint::kNo_Hinting: 839 loadFlags = FT_LOAD_NO_HINTING; 840 linearMetrics = true; 841 break; 842 case SkPaint::kSlight_Hinting: 843 loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT 844 break; 845 case SkPaint::kNormal_Hinting: 846 if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { 847 loadFlags = FT_LOAD_FORCE_AUTOHINT; 848 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK 849 } else { 850 loadFlags = FT_LOAD_NO_AUTOHINT; 851 #endif 852 } 853 break; 854 case SkPaint::kFull_Hinting: 855 if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { 856 loadFlags = FT_LOAD_FORCE_AUTOHINT; 857 break; 858 } 859 loadFlags = FT_LOAD_TARGET_NORMAL; 860 if (isLCD(fRec)) { 861 if (fLCDIsVert) { 862 loadFlags = FT_LOAD_TARGET_LCD_V; 863 } else { 864 loadFlags = FT_LOAD_TARGET_LCD; 865 } 866 } 867 break; 868 default: 869 SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); 870 break; 871 } 872 } 873 874 if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { 875 loadFlags |= FT_LOAD_NO_BITMAP; 876 } 877 878 // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct 879 // advances, as fontconfig and cairo do. 880 // See http://code.google.com/p/skia/issues/detail?id=222. 881 loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; 882 883 // Use vertical layout if requested. 884 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 885 loadFlags |= FT_LOAD_VERTICAL_LAYOUT; 886 } 887 888 loadFlags |= FT_LOAD_COLOR; 889 890 fLoadGlyphFlags = loadFlags; 891 } 892 893 using DoneFTSize = SkFunctionWrapper<FT_Error, skstd::remove_pointer_t<FT_Size>, FT_Done_Size>; 894 skstd::unique_ptr<skstd::remove_pointer_t<FT_Size>, DoneFTSize> ftSize([&ftFace]() -> FT_Size { 895 FT_Size size; 896 FT_Error err = FT_New_Size(ftFace.get(), &size); 897 if (err != 0) { 898 SkDEBUGF(("FT_New_Size returned %x for face %s\n", err, ftFace->family_name)); 899 return nullptr; 900 } 901 return size; 902 }()); 903 if (nullptr == ftSize) { 904 SkDEBUGF(("Could not create FT_Size.\n")); 905 return; 906 } 907 908 FT_Error err = FT_Activate_Size(ftSize.get()); 909 if (err != 0) { 910 SkDEBUGF(("FT_Activate_Size(%08x, 0x%x, 0x%x) returned 0x%x\n", 911 ftFace.get(), fScaleX, fScaleY, err)); 912 return; 913 } 914 915 if (FT_IS_SCALABLE(ftFace)) { 916 err = FT_Set_Char_Size(ftFace.get(), fScaleX, fScaleY, 72, 72); 917 if (err != 0) { 918 SkDEBUGF(("FT_Set_CharSize(%08x, 0x%x, 0x%x) returned 0x%x\n", 919 ftFace.get(), fScaleX, fScaleY, err)); 920 return; 921 } 922 FT_Set_Transform(ftFace.get(), &fMatrix22, nullptr); 923 } else if (FT_HAS_FIXED_SIZES(ftFace)) { 924 fStrikeIndex = chooseBitmapStrike(ftFace.get(), fScaleY); 925 if (fStrikeIndex == -1) { 926 SkDEBUGF(("no glyphs for font \"%s\" size %f?\n", 927 ftFace->family_name, SkFDot6ToScalar(fScaleY))); 928 } else { 929 // FreeType does no provide linear metrics for bitmap fonts. 930 linearMetrics = false; 931 932 // FreeType documentation says: 933 // FT_LOAD_NO_BITMAP -- Ignore bitmap strikes when loading. 934 // Bitmap-only fonts ignore this flag. 935 // 936 // However, in FreeType 2.5.1 color bitmap only fonts do not ignore this flag. 937 // Force this flag off for bitmap only fonts. 938 fLoadGlyphFlags &= ~FT_LOAD_NO_BITMAP; 939 } 940 } else { 941 SkDEBUGF(("unknown kind of font \"%s\" size %f?\n", 942 fFace->family_name, SkFDot6ToScalar(fScaleY))); 943 } 944 945 fFTSize = ftSize.release(); 946 fFace = ftFace.release(); 947 fDoLinearMetrics = linearMetrics; 948 } 949 950 SkScalerContext_FreeType::~SkScalerContext_FreeType() { 951 SkAutoMutexAcquire ac(gFTMutex); 952 953 if (fFTSize != nullptr) { 954 FT_Done_Size(fFTSize); 955 } 956 957 if (fFace != nullptr) { 958 unref_ft_face(fFace); 959 } 960 961 unref_ft_library(); 962 } 963 964 /* We call this before each use of the fFace, since we may be sharing 965 this face with other context (at different sizes). 966 */ 967 FT_Error SkScalerContext_FreeType::setupSize() { 968 gFTMutex.assertHeld(); 969 FT_Error err = FT_Activate_Size(fFTSize); 970 if (err != 0) { 971 SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%s %s, 0x%x, 0x%x) returned 0x%x\n", 972 fFace->family_name, fFace->style_name, fScaleX, fScaleY, err)); 973 fFTSize = nullptr; 974 return err; 975 } 976 977 // seems we need to reset this every time (not sure why, but without it 978 // I get random italics from some other fFTSize) 979 FT_Set_Transform(fFace, &fMatrix22, nullptr); 980 return 0; 981 } 982 983 unsigned SkScalerContext_FreeType::generateGlyphCount() { 984 return fFace->num_glyphs; 985 } 986 987 uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { 988 SkAutoMutexAcquire ac(gFTMutex); 989 return SkToU16(FT_Get_Char_Index( fFace, uni )); 990 } 991 992 SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { 993 SkAutoMutexAcquire ac(gFTMutex); 994 // iterate through each cmap entry, looking for matching glyph indices 995 FT_UInt glyphIndex; 996 SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); 997 998 while (glyphIndex != 0) { 999 if (glyphIndex == glyph) { 1000 return charCode; 1001 } 1002 charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); 1003 } 1004 1005 return 0; 1006 } 1007 1008 void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { 1009 /* unhinted and light hinted text have linearly scaled advances 1010 * which are very cheap to compute with some font formats... 1011 */ 1012 if (fDoLinearMetrics) { 1013 SkAutoMutexAcquire ac(gFTMutex); 1014 1015 if (this->setupSize()) { 1016 glyph->zeroMetrics(); 1017 return; 1018 } 1019 1020 FT_Error error; 1021 FT_Fixed advance; 1022 1023 error = FT_Get_Advance( fFace, glyph->getGlyphID(), 1024 fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, 1025 &advance ); 1026 if (0 == error) { 1027 glyph->fRsbDelta = 0; 1028 glyph->fLsbDelta = 0; 1029 glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); 1030 glyph->fAdvanceY = - SkFixedMul(fMatrix22.yx, advance); 1031 return; 1032 } 1033 } 1034 1035 /* otherwise, we need to load/hint the glyph, which is slower */ 1036 this->generateMetrics(glyph); 1037 return; 1038 } 1039 1040 void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, 1041 FT_BBox* bbox, 1042 bool snapToPixelBoundary) { 1043 1044 FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); 1045 1046 if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { 1047 int dx = SkFixedToFDot6(glyph->getSubXFixed()); 1048 int dy = SkFixedToFDot6(glyph->getSubYFixed()); 1049 // negate dy since freetype-y-goes-up and skia-y-goes-down 1050 bbox->xMin += dx; 1051 bbox->yMin -= dy; 1052 bbox->xMax += dx; 1053 bbox->yMax -= dy; 1054 } 1055 1056 // outset the box to integral boundaries 1057 if (snapToPixelBoundary) { 1058 bbox->xMin &= ~63; 1059 bbox->yMin &= ~63; 1060 bbox->xMax = (bbox->xMax + 63) & ~63; 1061 bbox->yMax = (bbox->yMax + 63) & ~63; 1062 } 1063 1064 // Must come after snapToPixelBoundary so that the width and height are 1065 // consistent. Otherwise asserts will fire later on when generating the 1066 // glyph image. 1067 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1068 FT_Vector vector; 1069 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1070 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1071 FT_Vector_Transform(&vector, &fMatrix22); 1072 bbox->xMin += vector.x; 1073 bbox->xMax += vector.x; 1074 bbox->yMin += vector.y; 1075 bbox->yMax += vector.y; 1076 } 1077 } 1078 1079 bool SkScalerContext_FreeType::getCBoxForLetter(char letter, FT_BBox* bbox) { 1080 const FT_UInt glyph_id = FT_Get_Char_Index(fFace, letter); 1081 if (!glyph_id) { 1082 return false; 1083 } 1084 if (FT_Load_Glyph(fFace, glyph_id, fLoadGlyphFlags) != 0) { 1085 return false; 1086 } 1087 emboldenIfNeeded(fFace, fFace->glyph); 1088 FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); 1089 return true; 1090 } 1091 1092 void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { 1093 if (isLCD(fRec)) { 1094 if (fLCDIsVert) { 1095 glyph->fHeight += gFTLibrary->lcdExtra(); 1096 glyph->fTop -= gFTLibrary->lcdExtra() >> 1; 1097 } else { 1098 glyph->fWidth += gFTLibrary->lcdExtra(); 1099 glyph->fLeft -= gFTLibrary->lcdExtra() >> 1; 1100 } 1101 } 1102 } 1103 1104 inline void scaleGlyphMetrics(SkGlyph& glyph, SkScalar scale) { 1105 glyph.fWidth *= scale; 1106 glyph.fHeight *= scale; 1107 glyph.fTop *= scale; 1108 glyph.fLeft *= scale; 1109 1110 SkFixed fixedScale = SkScalarToFixed(scale); 1111 glyph.fAdvanceX = SkFixedMul(glyph.fAdvanceX, fixedScale); 1112 glyph.fAdvanceY = SkFixedMul(glyph.fAdvanceY, fixedScale); 1113 } 1114 1115 void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { 1116 SkAutoMutexAcquire ac(gFTMutex); 1117 1118 glyph->fRsbDelta = 0; 1119 glyph->fLsbDelta = 0; 1120 1121 FT_Error err; 1122 1123 if (this->setupSize()) { 1124 glyph->zeroMetrics(); 1125 return; 1126 } 1127 1128 err = FT_Load_Glyph( fFace, glyph->getGlyphID(), fLoadGlyphFlags ); 1129 if (err != 0) { 1130 glyph->zeroMetrics(); 1131 return; 1132 } 1133 emboldenIfNeeded(fFace, fFace->glyph); 1134 1135 switch ( fFace->glyph->format ) { 1136 case FT_GLYPH_FORMAT_OUTLINE: 1137 if (0 == fFace->glyph->outline.n_contours) { 1138 glyph->fWidth = 0; 1139 glyph->fHeight = 0; 1140 glyph->fTop = 0; 1141 glyph->fLeft = 0; 1142 } else { 1143 FT_BBox bbox; 1144 getBBoxForCurrentGlyph(glyph, &bbox, true); 1145 1146 glyph->fWidth = SkToU16(SkFDot6Floor(bbox.xMax - bbox.xMin)); 1147 glyph->fHeight = SkToU16(SkFDot6Floor(bbox.yMax - bbox.yMin)); 1148 glyph->fTop = -SkToS16(SkFDot6Floor(bbox.yMax)); 1149 glyph->fLeft = SkToS16(SkFDot6Floor(bbox.xMin)); 1150 1151 updateGlyphIfLCD(glyph); 1152 } 1153 break; 1154 1155 case FT_GLYPH_FORMAT_BITMAP: 1156 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1157 FT_Vector vector; 1158 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1159 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1160 FT_Vector_Transform(&vector, &fMatrix22); 1161 fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); 1162 fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); 1163 } 1164 1165 if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) { 1166 glyph->fMaskFormat = SkMask::kARGB32_Format; 1167 } 1168 1169 glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); 1170 glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); 1171 glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); 1172 glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); 1173 break; 1174 1175 default: 1176 SkDEBUGFAIL("unknown glyph format"); 1177 glyph->zeroMetrics(); 1178 return; 1179 } 1180 1181 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1182 if (fDoLinearMetrics) { 1183 glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); 1184 glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); 1185 } else { 1186 glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); 1187 glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); 1188 } 1189 } else { 1190 if (fDoLinearMetrics) { 1191 glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); 1192 glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); 1193 } else { 1194 glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); 1195 glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); 1196 1197 if (fRec.fFlags & kDevKernText_Flag) { 1198 glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); 1199 glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); 1200 } 1201 } 1202 } 1203 1204 // If the font isn't scalable, scale the metrics from the non-scalable strike. 1205 // This means do not try to scale embedded bitmaps; only scale bitmaps in bitmap only fonts. 1206 if (!FT_IS_SCALABLE(fFace) && !SkScalarNearlyZero(fScale.fY) && fFace->size->metrics.y_ppem) { 1207 // NOTE: both dimensions are scaled by y_ppem. this is WAI. 1208 scaleGlyphMetrics(*glyph, fScale.fY / fFace->size->metrics.y_ppem); 1209 } 1210 1211 #ifdef ENABLE_GLYPH_SPEW 1212 SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); 1213 SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(), fLoadGlyphFlags, glyph->fWidth)); 1214 #endif 1215 } 1216 1217 static void clear_glyph_image(const SkGlyph& glyph) { 1218 sk_bzero(glyph.fImage, glyph.rowBytes() * glyph.fHeight); 1219 } 1220 1221 void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { 1222 SkAutoMutexAcquire ac(gFTMutex); 1223 1224 if (this->setupSize()) { 1225 clear_glyph_image(glyph); 1226 return; 1227 } 1228 1229 FT_Error err = FT_Load_Glyph(fFace, glyph.getGlyphID(), fLoadGlyphFlags); 1230 if (err != 0) { 1231 SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", 1232 glyph.getGlyphID(), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); 1233 clear_glyph_image(glyph); 1234 return; 1235 } 1236 1237 emboldenIfNeeded(fFace, fFace->glyph); 1238 generateGlyphImage(fFace, glyph); 1239 } 1240 1241 1242 void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, SkPath* path) { 1243 SkAutoMutexAcquire ac(gFTMutex); 1244 1245 SkASSERT(path); 1246 1247 if (this->setupSize()) { 1248 path->reset(); 1249 return; 1250 } 1251 1252 uint32_t flags = fLoadGlyphFlags; 1253 flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline 1254 flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) 1255 1256 FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(), flags); 1257 1258 if (err != 0) { 1259 SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", 1260 glyph.getGlyphID(), flags, err)); 1261 path->reset(); 1262 return; 1263 } 1264 emboldenIfNeeded(fFace, fFace->glyph); 1265 1266 generateGlyphPath(fFace, path); 1267 1268 // The path's origin from FreeType is always the horizontal layout origin. 1269 // Offset the path so that it is relative to the vertical origin if needed. 1270 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1271 FT_Vector vector; 1272 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1273 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1274 FT_Vector_Transform(&vector, &fMatrix22); 1275 path->offset(SkFDot6ToScalar(vector.x), -SkFDot6ToScalar(vector.y)); 1276 } 1277 } 1278 1279 void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* metrics) { 1280 if (nullptr == metrics) { 1281 return; 1282 } 1283 1284 SkAutoMutexAcquire ac(gFTMutex); 1285 1286 if (this->setupSize()) { 1287 ERROR: 1288 sk_bzero(metrics, sizeof(*metrics)); 1289 return; 1290 } 1291 1292 FT_Face face = fFace; 1293 SkScalar scaleX = fScale.x(); 1294 SkScalar scaleY = fScale.y(); 1295 SkScalar mxy = fMatrix22Scalar.getSkewX() * scaleY; 1296 SkScalar myy = fMatrix22Scalar.getScaleY() * scaleY; 1297 1298 // fetch units/EM from "head" table if needed (ie for bitmap fonts) 1299 SkScalar upem = SkIntToScalar(face->units_per_EM); 1300 if (!upem) { 1301 TT_Header* ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, ft_sfnt_head); 1302 if (ttHeader) { 1303 upem = SkIntToScalar(ttHeader->Units_Per_EM); 1304 } 1305 } 1306 1307 // use the os/2 table as a source of reasonable defaults. 1308 SkScalar x_height = 0.0f; 1309 SkScalar avgCharWidth = 0.0f; 1310 SkScalar cap_height = 0.0f; 1311 TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); 1312 if (os2) { 1313 x_height = scaleX * SkIntToScalar(os2->sxHeight) / upem; 1314 avgCharWidth = SkIntToScalar(os2->xAvgCharWidth) / upem; 1315 if (os2->version != 0xFFFF && os2->version >= 2) { 1316 cap_height = scaleX * SkIntToScalar(os2->sCapHeight) / upem; 1317 } 1318 } 1319 1320 // pull from format-specific metrics as needed 1321 SkScalar ascent, descent, leading, xmin, xmax, ymin, ymax; 1322 SkScalar underlineThickness, underlinePosition; 1323 if (face->face_flags & FT_FACE_FLAG_SCALABLE) { // scalable outline font 1324 // FreeType will always use HHEA metrics if they're not zero. 1325 // It completely ignores the OS/2 fsSelection::UseTypoMetrics bit. 1326 // It also ignores the VDMX tables, which are also of interest here 1327 // (and override everything else when they apply). 1328 static const int kUseTypoMetricsMask = (1 << 7); 1329 if (os2 && os2->version != 0xFFFF && (os2->fsSelection & kUseTypoMetricsMask)) { 1330 ascent = -SkIntToScalar(os2->sTypoAscender) / upem; 1331 descent = -SkIntToScalar(os2->sTypoDescender) / upem; 1332 leading = SkIntToScalar(os2->sTypoLineGap) / upem; 1333 } else { 1334 ascent = -SkIntToScalar(face->ascender) / upem; 1335 descent = -SkIntToScalar(face->descender) / upem; 1336 leading = SkIntToScalar(face->height + (face->descender - face->ascender)) / upem; 1337 } 1338 xmin = SkIntToScalar(face->bbox.xMin) / upem; 1339 xmax = SkIntToScalar(face->bbox.xMax) / upem; 1340 ymin = -SkIntToScalar(face->bbox.yMin) / upem; 1341 ymax = -SkIntToScalar(face->bbox.yMax) / upem; 1342 underlineThickness = SkIntToScalar(face->underline_thickness) / upem; 1343 underlinePosition = -SkIntToScalar(face->underline_position + 1344 face->underline_thickness / 2) / upem; 1345 1346 metrics->fFlags |= SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag; 1347 metrics->fFlags |= SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag; 1348 1349 // we may be able to synthesize x_height and cap_height from outline 1350 if (!x_height) { 1351 FT_BBox bbox; 1352 if (getCBoxForLetter('x', &bbox)) { 1353 x_height = SkIntToScalar(bbox.yMax) / 64.0f; 1354 } 1355 } 1356 if (!cap_height) { 1357 FT_BBox bbox; 1358 if (getCBoxForLetter('H', &bbox)) { 1359 cap_height = SkIntToScalar(bbox.yMax) / 64.0f; 1360 } 1361 } 1362 } else if (fStrikeIndex != -1) { // bitmap strike metrics 1363 SkScalar xppem = SkIntToScalar(face->size->metrics.x_ppem); 1364 SkScalar yppem = SkIntToScalar(face->size->metrics.y_ppem); 1365 ascent = -SkIntToScalar(face->size->metrics.ascender) / (yppem * 64.0f); 1366 descent = -SkIntToScalar(face->size->metrics.descender) / (yppem * 64.0f); 1367 leading = (SkIntToScalar(face->size->metrics.height) / (yppem * 64.0f)) 1368 + ascent - descent; 1369 xmin = 0.0f; 1370 xmax = SkIntToScalar(face->available_sizes[fStrikeIndex].width) / xppem; 1371 ymin = descent + leading; 1372 ymax = ascent - descent; 1373 underlineThickness = 0; 1374 underlinePosition = 0; 1375 1376 metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag; 1377 metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag; 1378 } else { 1379 goto ERROR; 1380 } 1381 1382 // synthesize elements that were not provided by the os/2 table or format-specific metrics 1383 if (!x_height) { 1384 x_height = -ascent; 1385 } 1386 if (!avgCharWidth) { 1387 avgCharWidth = xmax - xmin; 1388 } 1389 if (!cap_height) { 1390 cap_height = -ascent; 1391 } 1392 1393 // disallow negative linespacing 1394 if (leading < 0.0f) { 1395 leading = 0.0f; 1396 } 1397 1398 SkScalar scale = myy; 1399 if (this->isVertical()) { 1400 scale = mxy; 1401 } 1402 metrics->fTop = ymax * scale; 1403 metrics->fAscent = ascent * scale; 1404 metrics->fDescent = descent * scale; 1405 metrics->fBottom = ymin * scale; 1406 metrics->fLeading = leading * scale; 1407 metrics->fAvgCharWidth = avgCharWidth * scale; 1408 metrics->fXMin = xmin * scale; 1409 metrics->fXMax = xmax * scale; 1410 metrics->fXHeight = x_height; 1411 metrics->fCapHeight = cap_height; 1412 metrics->fUnderlineThickness = underlineThickness * scale; 1413 metrics->fUnderlinePosition = underlinePosition * scale; 1414 } 1415 1416 /////////////////////////////////////////////////////////////////////////////// 1417 1418 // hand-tuned value to reduce outline embolden strength 1419 #ifndef SK_OUTLINE_EMBOLDEN_DIVISOR 1420 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK 1421 #define SK_OUTLINE_EMBOLDEN_DIVISOR 34 1422 #else 1423 #define SK_OUTLINE_EMBOLDEN_DIVISOR 24 1424 #endif 1425 #endif 1426 1427 /////////////////////////////////////////////////////////////////////////////// 1428 1429 void SkScalerContext_FreeType::emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph) 1430 { 1431 // check to see if the embolden bit is set 1432 if (0 == (fRec.fFlags & SkScalerContext::kEmbolden_Flag)) { 1433 return; 1434 } 1435 1436 switch (glyph->format) { 1437 case FT_GLYPH_FORMAT_OUTLINE: 1438 FT_Pos strength; 1439 strength = FT_MulFix(face->units_per_EM, face->size->metrics.y_scale) 1440 / SK_OUTLINE_EMBOLDEN_DIVISOR; 1441 FT_Outline_Embolden(&glyph->outline, strength); 1442 break; 1443 case FT_GLYPH_FORMAT_BITMAP: 1444 FT_GlyphSlot_Own_Bitmap(glyph); 1445 FT_Bitmap_Embolden(glyph->library, &glyph->bitmap, kBitmapEmboldenStrength, 0); 1446 break; 1447 default: 1448 SkDEBUGFAIL("unknown glyph format"); 1449 } 1450 } 1451 1452 /////////////////////////////////////////////////////////////////////////////// 1453 1454 #include "SkUtils.h" 1455 1456 static SkUnichar next_utf8(const void** chars) { 1457 return SkUTF8_NextUnichar((const char**)chars); 1458 } 1459 1460 static SkUnichar next_utf16(const void** chars) { 1461 return SkUTF16_NextUnichar((const uint16_t**)chars); 1462 } 1463 1464 static SkUnichar next_utf32(const void** chars) { 1465 const SkUnichar** uniChars = (const SkUnichar**)chars; 1466 SkUnichar uni = **uniChars; 1467 *uniChars += 1; 1468 return uni; 1469 } 1470 1471 typedef SkUnichar (*EncodingProc)(const void**); 1472 1473 static EncodingProc find_encoding_proc(SkTypeface::Encoding enc) { 1474 static const EncodingProc gProcs[] = { 1475 next_utf8, next_utf16, next_utf32 1476 }; 1477 SkASSERT((size_t)enc < SK_ARRAY_COUNT(gProcs)); 1478 return gProcs[enc]; 1479 } 1480 1481 int SkTypeface_FreeType::onCharsToGlyphs(const void* chars, Encoding encoding, 1482 uint16_t glyphs[], int glyphCount) const 1483 { 1484 AutoFTAccess fta(this); 1485 FT_Face face = fta.face(); 1486 if (!face) { 1487 if (glyphs) { 1488 sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); 1489 } 1490 return 0; 1491 } 1492 1493 EncodingProc next_uni_proc = find_encoding_proc(encoding); 1494 1495 if (nullptr == glyphs) { 1496 for (int i = 0; i < glyphCount; ++i) { 1497 if (0 == FT_Get_Char_Index(face, next_uni_proc(&chars))) { 1498 return i; 1499 } 1500 } 1501 return glyphCount; 1502 } else { 1503 int first = glyphCount; 1504 for (int i = 0; i < glyphCount; ++i) { 1505 unsigned id = FT_Get_Char_Index(face, next_uni_proc(&chars)); 1506 glyphs[i] = SkToU16(id); 1507 if (0 == id && i < first) { 1508 first = i; 1509 } 1510 } 1511 return first; 1512 } 1513 } 1514 1515 int SkTypeface_FreeType::onCountGlyphs() const { 1516 // we cache this value, using -1 as a sentinel for "not computed" 1517 if (fGlyphCount < 0) { 1518 AutoFTAccess fta(this); 1519 FT_Face face = fta.face(); 1520 // if the face failed, we still assign a non-negative value 1521 fGlyphCount = face ? face->num_glyphs : 0; 1522 } 1523 return fGlyphCount; 1524 } 1525 1526 SkTypeface::LocalizedStrings* SkTypeface_FreeType::onCreateFamilyNameIterator() const { 1527 SkTypeface::LocalizedStrings* nameIter = 1528 SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this); 1529 if (nullptr == nameIter) { 1530 SkString familyName; 1531 this->getFamilyName(&familyName); 1532 SkString language("und"); //undetermined 1533 nameIter = new SkOTUtils::LocalizedStrings_SingleName(familyName, language); 1534 } 1535 return nameIter; 1536 } 1537 1538 int SkTypeface_FreeType::onGetTableTags(SkFontTableTag tags[]) const { 1539 AutoFTAccess fta(this); 1540 FT_Face face = fta.face(); 1541 1542 FT_ULong tableCount = 0; 1543 FT_Error error; 1544 1545 // When 'tag' is nullptr, returns number of tables in 'length'. 1546 error = FT_Sfnt_Table_Info(face, 0, nullptr, &tableCount); 1547 if (error) { 1548 return 0; 1549 } 1550 1551 if (tags) { 1552 for (FT_ULong tableIndex = 0; tableIndex < tableCount; ++tableIndex) { 1553 FT_ULong tableTag; 1554 FT_ULong tablelength; 1555 error = FT_Sfnt_Table_Info(face, tableIndex, &tableTag, &tablelength); 1556 if (error) { 1557 return 0; 1558 } 1559 tags[tableIndex] = static_cast<SkFontTableTag>(tableTag); 1560 } 1561 } 1562 return tableCount; 1563 } 1564 1565 size_t SkTypeface_FreeType::onGetTableData(SkFontTableTag tag, size_t offset, 1566 size_t length, void* data) const 1567 { 1568 AutoFTAccess fta(this); 1569 FT_Face face = fta.face(); 1570 1571 FT_ULong tableLength = 0; 1572 FT_Error error; 1573 1574 // When 'length' is 0 it is overwritten with the full table length; 'offset' is ignored. 1575 error = FT_Load_Sfnt_Table(face, tag, 0, nullptr, &tableLength); 1576 if (error) { 1577 return 0; 1578 } 1579 1580 if (offset > tableLength) { 1581 return 0; 1582 } 1583 FT_ULong size = SkTMin((FT_ULong)length, tableLength - (FT_ULong)offset); 1584 if (data) { 1585 error = FT_Load_Sfnt_Table(face, tag, offset, reinterpret_cast<FT_Byte*>(data), &size); 1586 if (error) { 1587 return 0; 1588 } 1589 } 1590 1591 return size; 1592 } 1593 1594 /////////////////////////////////////////////////////////////////////////////// 1595 /////////////////////////////////////////////////////////////////////////////// 1596 1597 SkTypeface_FreeType::Scanner::Scanner() : fLibrary(nullptr) { 1598 if (FT_New_Library(&gFTMemory, &fLibrary)) { 1599 return; 1600 } 1601 FT_Add_Default_Modules(fLibrary); 1602 } 1603 SkTypeface_FreeType::Scanner::~Scanner() { 1604 if (fLibrary) { 1605 FT_Done_Library(fLibrary); 1606 } 1607 } 1608 1609 FT_Face SkTypeface_FreeType::Scanner::openFace(SkStream* stream, int ttcIndex, 1610 FT_Stream ftStream) const 1611 { 1612 if (fLibrary == nullptr) { 1613 return nullptr; 1614 } 1615 1616 FT_Open_Args args; 1617 memset(&args, 0, sizeof(args)); 1618 1619 const void* memoryBase = stream->getMemoryBase(); 1620 1621 if (memoryBase) { 1622 args.flags = FT_OPEN_MEMORY; 1623 args.memory_base = (const FT_Byte*)memoryBase; 1624 args.memory_size = stream->getLength(); 1625 } else { 1626 memset(ftStream, 0, sizeof(*ftStream)); 1627 ftStream->size = stream->getLength(); 1628 ftStream->descriptor.pointer = stream; 1629 ftStream->read = sk_ft_stream_io; 1630 ftStream->close = sk_ft_stream_close; 1631 1632 args.flags = FT_OPEN_STREAM; 1633 args.stream = ftStream; 1634 } 1635 1636 FT_Face face; 1637 if (FT_Open_Face(fLibrary, &args, ttcIndex, &face)) { 1638 return nullptr; 1639 } 1640 return face; 1641 } 1642 1643 bool SkTypeface_FreeType::Scanner::recognizedFont(SkStream* stream, int* numFaces) const { 1644 SkAutoMutexAcquire libraryLock(fLibraryMutex); 1645 1646 FT_StreamRec streamRec; 1647 FT_Face face = this->openFace(stream, -1, &streamRec); 1648 if (nullptr == face) { 1649 return false; 1650 } 1651 1652 *numFaces = face->num_faces; 1653 1654 FT_Done_Face(face); 1655 return true; 1656 } 1657 1658 #include "SkTSearch.h" 1659 bool SkTypeface_FreeType::Scanner::scanFont( 1660 SkStream* stream, int ttcIndex, 1661 SkString* name, SkFontStyle* style, bool* isFixedPitch, AxisDefinitions* axes) const 1662 { 1663 SkAutoMutexAcquire libraryLock(fLibraryMutex); 1664 1665 FT_StreamRec streamRec; 1666 FT_Face face = this->openFace(stream, ttcIndex, &streamRec); 1667 if (nullptr == face) { 1668 return false; 1669 } 1670 1671 int weight = SkFontStyle::kNormal_Weight; 1672 int width = SkFontStyle::kNormal_Width; 1673 SkFontStyle::Slant slant = SkFontStyle::kUpright_Slant; 1674 if (face->style_flags & FT_STYLE_FLAG_BOLD) { 1675 weight = SkFontStyle::kBold_Weight; 1676 } 1677 if (face->style_flags & FT_STYLE_FLAG_ITALIC) { 1678 slant = SkFontStyle::kItalic_Slant; 1679 } 1680 1681 PS_FontInfoRec psFontInfo; 1682 TT_OS2* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(face, ft_sfnt_os2)); 1683 if (os2 && os2->version != 0xffff) { 1684 weight = os2->usWeightClass; 1685 width = os2->usWidthClass; 1686 } else if (0 == FT_Get_PS_Font_Info(face, &psFontInfo) && psFontInfo.weight) { 1687 static const struct { 1688 char const * const name; 1689 int const weight; 1690 } commonWeights [] = { 1691 // There are probably more common names, but these are known to exist. 1692 { "all", SkFontStyle::kNormal_Weight }, // Multiple Masters usually default to normal. 1693 { "black", SkFontStyle::kBlack_Weight }, 1694 { "bold", SkFontStyle::kBold_Weight }, 1695 { "book", (SkFontStyle::kNormal_Weight + SkFontStyle::kLight_Weight)/2 }, 1696 { "demi", SkFontStyle::kSemiBold_Weight }, 1697 { "demibold", SkFontStyle::kSemiBold_Weight }, 1698 { "extra", SkFontStyle::kExtraBold_Weight }, 1699 { "extrabold", SkFontStyle::kExtraBold_Weight }, 1700 { "extralight", SkFontStyle::kExtraLight_Weight }, 1701 { "hairline", SkFontStyle::kThin_Weight }, 1702 { "heavy", SkFontStyle::kBlack_Weight }, 1703 { "light", SkFontStyle::kLight_Weight }, 1704 { "medium", SkFontStyle::kMedium_Weight }, 1705 { "normal", SkFontStyle::kNormal_Weight }, 1706 { "plain", SkFontStyle::kNormal_Weight }, 1707 { "regular", SkFontStyle::kNormal_Weight }, 1708 { "roman", SkFontStyle::kNormal_Weight }, 1709 { "semibold", SkFontStyle::kSemiBold_Weight }, 1710 { "standard", SkFontStyle::kNormal_Weight }, 1711 { "thin", SkFontStyle::kThin_Weight }, 1712 { "ultra", SkFontStyle::kExtraBold_Weight }, 1713 { "ultrablack", 1000 }, 1714 { "ultrabold", SkFontStyle::kExtraBold_Weight }, 1715 { "ultraheavy", 1000 }, 1716 { "ultralight", SkFontStyle::kExtraLight_Weight }, 1717 }; 1718 int const index = SkStrLCSearch(&commonWeights[0].name, SK_ARRAY_COUNT(commonWeights), 1719 psFontInfo.weight, sizeof(commonWeights[0])); 1720 if (index >= 0) { 1721 weight = commonWeights[index].weight; 1722 } else { 1723 SkDEBUGF(("Do not know weight for: %s (%s) \n", face->family_name, psFontInfo.weight)); 1724 } 1725 } 1726 1727 if (name) { 1728 name->set(face->family_name); 1729 } 1730 if (style) { 1731 *style = SkFontStyle(weight, width, slant); 1732 } 1733 if (isFixedPitch) { 1734 *isFixedPitch = FT_IS_FIXED_WIDTH(face); 1735 } 1736 1737 if (axes && face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) { 1738 FT_MM_Var* variations = nullptr; 1739 FT_Error err = FT_Get_MM_Var(face, &variations); 1740 if (err) { 1741 SkDEBUGF(("INFO: font %s claims to have variations, but none found.\n", 1742 face->family_name)); 1743 return false; 1744 } 1745 SkAutoFree autoFreeVariations(variations); 1746 1747 axes->reset(variations->num_axis); 1748 for (FT_UInt i = 0; i < variations->num_axis; ++i) { 1749 const FT_Var_Axis& ftAxis = variations->axis[i]; 1750 (*axes)[i].fTag = ftAxis.tag; 1751 (*axes)[i].fMinimum = ftAxis.minimum; 1752 (*axes)[i].fDefault = ftAxis.def; 1753 (*axes)[i].fMaximum = ftAxis.maximum; 1754 } 1755 } 1756 1757 FT_Done_Face(face); 1758 return true; 1759 } 1760 1761 /*static*/ void SkTypeface_FreeType::Scanner::computeAxisValues( 1762 AxisDefinitions axisDefinitions, 1763 const SkFontMgr::FontParameters::Axis* requestedAxes, int requestedAxisCount, 1764 SkFixed* axisValues, 1765 const SkString& name) 1766 { 1767 for (int i = 0; i < axisDefinitions.count(); ++i) { 1768 const Scanner::AxisDefinition& axisDefinition = axisDefinitions[i]; 1769 const SkScalar axisMin = SkFixedToScalar(axisDefinition.fMinimum); 1770 const SkScalar axisMax = SkFixedToScalar(axisDefinition.fMaximum); 1771 axisValues[i] = axisDefinition.fDefault; 1772 for (int j = 0; j < requestedAxisCount; ++j) { 1773 const SkFontMgr::FontParameters::Axis& axisSpecified = requestedAxes[j]; 1774 if (axisDefinition.fTag == axisSpecified.fTag) { 1775 const SkScalar axisValue = SkTPin(axisSpecified.fStyleValue, axisMin, axisMax); 1776 if (axisSpecified.fStyleValue != axisValue) { 1777 SkDEBUGF(("Requested font axis value out of range: " 1778 "%s '%c%c%c%c' %f; pinned to %f.\n", 1779 name.c_str(), 1780 (axisDefinition.fTag >> 24) & 0xFF, 1781 (axisDefinition.fTag >> 16) & 0xFF, 1782 (axisDefinition.fTag >> 8) & 0xFF, 1783 (axisDefinition.fTag ) & 0xFF, 1784 SkScalarToDouble(axisSpecified.fStyleValue), 1785 SkScalarToDouble(axisValue))); 1786 } 1787 axisValues[i] = SkScalarToFixed(axisValue); 1788 break; 1789 } 1790 } 1791 // TODO: warn on defaulted axis? 1792 } 1793 1794 SkDEBUGCODE( 1795 // Check for axis specified, but not matched in font. 1796 for (int i = 0; i < requestedAxisCount; ++i) { 1797 SkFourByteTag skTag = requestedAxes[i].fTag; 1798 bool found = false; 1799 for (int j = 0; j < axisDefinitions.count(); ++j) { 1800 if (skTag == axisDefinitions[j].fTag) { 1801 found = true; 1802 break; 1803 } 1804 } 1805 if (!found) { 1806 SkDEBUGF(("Requested font axis not found: %s '%c%c%c%c'\n", 1807 name.c_str(), 1808 (skTag >> 24) & 0xFF, 1809 (skTag >> 16) & 0xFF, 1810 (skTag >> 8) & 0xFF, 1811 (skTag) & 0xFF)); 1812 } 1813 } 1814 ) 1815 } 1816
