1 2/* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9#include "SkBitmap.h" 10#include "SkCanvas.h" 11#include "SkColorPriv.h" 12#include "SkDescriptor.h" 13#include "SkFDot6.h" 14#include "SkFloatingPoint.h" 15#include "SkFontHost.h" 16#include "SkFontHost_FreeType_common.h" 17#include "SkGlyph.h" 18#include "SkMask.h" 19#include "SkMaskGamma.h" 20#include "SkOTUtils.h" 21#include "SkAdvancedTypefaceMetrics.h" 22#include "SkScalerContext.h" 23#include "SkStream.h" 24#include "SkString.h" 25#include "SkTemplates.h" 26#include "SkThread.h" 27 28#if defined(SK_CAN_USE_DLOPEN) 29#include <dlfcn.h> 30#endif 31#include <ft2build.h> 32#include FT_FREETYPE_H 33#include FT_OUTLINE_H 34#include FT_SIZES_H 35#include FT_TRUETYPE_TABLES_H 36#include FT_TYPE1_TABLES_H 37#include FT_BITMAP_H 38// In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. 39#include FT_SYNTHESIS_H 40#include FT_XFREE86_H 41#ifdef FT_LCD_FILTER_H 42#include FT_LCD_FILTER_H 43#endif 44 45#ifdef FT_ADVANCES_H 46#include FT_ADVANCES_H 47#endif 48 49#if 0 50// Also include the files by name for build tools which require this. 51#include <freetype/freetype.h> 52#include <freetype/ftoutln.h> 53#include <freetype/ftsizes.h> 54#include <freetype/tttables.h> 55#include <freetype/ftadvanc.h> 56#include <freetype/ftlcdfil.h> 57#include <freetype/ftbitmap.h> 58#include <freetype/ftsynth.h> 59#endif 60 61// FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA 62// were introduced in FreeType 2.5.0. 63// The following may be removed once FreeType 2.5.0 is required to build. 64#ifndef FT_LOAD_COLOR 65# define FT_LOAD_COLOR ( 1L << 20 ) 66# define FT_PIXEL_MODE_BGRA 7 67#endif 68 69// FT_HAS_COLOR and the corresponding FT_FACE_FLAG_COLOR 70// were introduced in FreeType 2.5.1 71// The following may be removed once FreeType 2.5.1 is required to build. 72#ifndef FT_HAS_COLOR 73# define FT_HAS_COLOR(face) false 74#endif 75 76//#define ENABLE_GLYPH_SPEW // for tracing calls 77//#define DUMP_STRIKE_CREATION 78 79//#define SK_GAMMA_APPLY_TO_A8 80 81using namespace skia_advanced_typeface_metrics_utils; 82 83static bool isLCD(const SkScalerContext::Rec& rec) { 84 switch (rec.fMaskFormat) { 85 case SkMask::kLCD16_Format: 86 case SkMask::kLCD32_Format: 87 return true; 88 default: 89 return false; 90 } 91} 92 93////////////////////////////////////////////////////////////////////////// 94 95struct SkFaceRec; 96 97SK_DECLARE_STATIC_MUTEX(gFTMutex); 98static int gFTCount; 99static FT_Library gFTLibrary; 100static SkFaceRec* gFaceRecHead; 101static bool gLCDSupportValid; // true iff |gLCDSupport| has been set. 102static bool gLCDSupport; // true iff LCD is supported by the runtime. 103static int gLCDExtra; // number of extra pixels for filtering. 104 105///////////////////////////////////////////////////////////////////////// 106 107// FT_Library_SetLcdFilterWeights was introduced in FreeType 2.4.0. 108// The following platforms provide FreeType of at least 2.4.0. 109// Ubuntu >= 11.04 (previous deprecated April 2013) 110// Debian >= 6.0 (good) 111// OpenSuse >= 11.4 (previous deprecated January 2012 / Nov 2013 for Evergreen 11.2) 112// Fedora >= 14 (good) 113// Android >= Gingerbread (good) 114typedef FT_Error (*FT_Library_SetLcdFilterWeightsProc)(FT_Library, unsigned char*); 115 116// Caller must lock gFTMutex before calling this function. 117static bool InitFreetype() { 118 FT_Error err = FT_Init_FreeType(&gFTLibrary); 119 if (err) { 120 return false; 121 } 122 123 // Setup LCD filtering. This reduces color fringes for LCD smoothed glyphs. 124#ifdef FT_LCD_FILTER_H 125 // Use default { 0x10, 0x40, 0x70, 0x40, 0x10 }, as it adds up to 0x110, simulating ink spread. 126 // SetLcdFilter must be called before SetLcdFilterWeights. 127 err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_DEFAULT); 128 if (0 == err) { 129 gLCDSupport = true; 130 gLCDExtra = 2; //Using a filter adds one full pixel to each side. 131 132#ifdef SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER 133 // This also adds to 0x110 simulating ink spread, but provides better results than default. 134 static unsigned char gGaussianLikeHeavyWeights[] = { 0x1A, 0x43, 0x56, 0x43, 0x1A, }; 135 136#if defined(SK_FONTHOST_FREETYPE_RUNTIME_VERSION) && \ 137 SK_FONTHOST_FREETYPE_RUNTIME_VERSION > 0x020400 138 err = FT_Library_SetLcdFilterWeights(gFTLibrary, gGaussianLikeHeavyWeights); 139#elif defined(SK_CAN_USE_DLOPEN) && SK_CAN_USE_DLOPEN == 1 140 //The FreeType library is already loaded, so symbols are available in process. 141 void* self = dlopen(NULL, RTLD_LAZY); 142 if (NULL != self) { 143 FT_Library_SetLcdFilterWeightsProc setLcdFilterWeights; 144 //The following cast is non-standard, but safe for POSIX. 145 *reinterpret_cast<void**>(&setLcdFilterWeights) = dlsym(self, "FT_Library_SetLcdFilterWeights"); 146 dlclose(self); 147 148 if (NULL != setLcdFilterWeights) { 149 err = setLcdFilterWeights(gFTLibrary, gGaussianLikeHeavyWeights); 150 } 151 } 152#endif 153#endif 154 } 155#else 156 gLCDSupport = false; 157#endif 158 gLCDSupportValid = true; 159 160 return true; 161} 162 163// Lazy, once, wrapper to ask the FreeType Library if it can support LCD text 164static bool is_lcd_supported() { 165 if (!gLCDSupportValid) { 166 SkAutoMutexAcquire ac(gFTMutex); 167 168 if (!gLCDSupportValid) { 169 InitFreetype(); 170 FT_Done_FreeType(gFTLibrary); 171 } 172 } 173 return gLCDSupport; 174} 175 176class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { 177public: 178 SkScalerContext_FreeType(SkTypeface*, const SkDescriptor* desc); 179 virtual ~SkScalerContext_FreeType(); 180 181 bool success() const { 182 return fFaceRec != NULL && 183 fFTSize != NULL && 184 fFace != NULL; 185 } 186 187protected: 188 virtual unsigned generateGlyphCount() SK_OVERRIDE; 189 virtual uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE; 190 virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE; 191 virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE; 192 virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE; 193 virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE; 194 virtual void generateFontMetrics(SkPaint::FontMetrics* mx, 195 SkPaint::FontMetrics* my) SK_OVERRIDE; 196 virtual SkUnichar generateGlyphToChar(uint16_t glyph) SK_OVERRIDE; 197 198private: 199 SkFaceRec* fFaceRec; 200 FT_Face fFace; // reference to shared face in gFaceRecHead 201 FT_Size fFTSize; // our own copy 202 FT_Int fStrikeIndex; 203 SkFixed fScaleX, fScaleY; 204 FT_Matrix fMatrix22; 205 uint32_t fLoadGlyphFlags; 206 bool fDoLinearMetrics; 207 bool fLCDIsVert; 208 209 // Need scalar versions for generateFontMetrics 210 SkVector fScale; 211 SkMatrix fMatrix22Scalar; 212 213 FT_Error setupSize(); 214 void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, 215 bool snapToPixelBoundary = false); 216 // Caller must lock gFTMutex before calling this function. 217 void updateGlyphIfLCD(SkGlyph* glyph); 218}; 219 220/////////////////////////////////////////////////////////////////////////// 221/////////////////////////////////////////////////////////////////////////// 222 223struct SkFaceRec { 224 SkFaceRec* fNext; 225 FT_Face fFace; 226 FT_StreamRec fFTStream; 227 SkStream* fSkStream; 228 uint32_t fRefCnt; 229 uint32_t fFontID; 230 231 // assumes ownership of the stream, will call unref() when its done 232 SkFaceRec(SkStream* strm, uint32_t fontID); 233 ~SkFaceRec() { 234 fSkStream->unref(); 235 } 236}; 237 238extern "C" { 239 static unsigned long sk_stream_read(FT_Stream stream, 240 unsigned long offset, 241 unsigned char* buffer, 242 unsigned long count ) { 243 SkStream* str = (SkStream*)stream->descriptor.pointer; 244 245 if (count) { 246 if (!str->rewind()) { 247 return 0; 248 } else { 249 unsigned long ret; 250 if (offset) { 251 ret = str->read(NULL, offset); 252 if (ret != offset) { 253 return 0; 254 } 255 } 256 ret = str->read(buffer, count); 257 if (ret != count) { 258 return 0; 259 } 260 count = ret; 261 } 262 } 263 return count; 264 } 265 266 static void sk_stream_close(FT_Stream) {} 267} 268 269SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) 270 : fNext(NULL), fSkStream(strm), fRefCnt(1), fFontID(fontID) { 271// SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); 272 273 sk_bzero(&fFTStream, sizeof(fFTStream)); 274 fFTStream.size = fSkStream->getLength(); 275 fFTStream.descriptor.pointer = fSkStream; 276 fFTStream.read = sk_stream_read; 277 fFTStream.close = sk_stream_close; 278} 279 280// Will return 0 on failure 281// Caller must lock gFTMutex before calling this function. 282static SkFaceRec* ref_ft_face(const SkTypeface* typeface) { 283 const SkFontID fontID = typeface->uniqueID(); 284 SkFaceRec* rec = gFaceRecHead; 285 while (rec) { 286 if (rec->fFontID == fontID) { 287 SkASSERT(rec->fFace); 288 rec->fRefCnt += 1; 289 return rec; 290 } 291 rec = rec->fNext; 292 } 293 294 int face_index; 295 SkStream* strm = typeface->openStream(&face_index); 296 if (NULL == strm) { 297 return NULL; 298 } 299 300 // this passes ownership of strm to the rec 301 rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); 302 303 FT_Open_Args args; 304 memset(&args, 0, sizeof(args)); 305 const void* memoryBase = strm->getMemoryBase(); 306 307 if (NULL != memoryBase) { 308//printf("mmap(%s)\n", keyString.c_str()); 309 args.flags = FT_OPEN_MEMORY; 310 args.memory_base = (const FT_Byte*)memoryBase; 311 args.memory_size = strm->getLength(); 312 } else { 313//printf("fopen(%s)\n", keyString.c_str()); 314 args.flags = FT_OPEN_STREAM; 315 args.stream = &rec->fFTStream; 316 } 317 318 FT_Error err = FT_Open_Face(gFTLibrary, &args, face_index, &rec->fFace); 319 if (err) { // bad filename, try the default font 320 fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); 321 SkDELETE(rec); 322 return NULL; 323 } else { 324 SkASSERT(rec->fFace); 325 //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); 326 rec->fNext = gFaceRecHead; 327 gFaceRecHead = rec; 328 return rec; 329 } 330} 331 332// Caller must lock gFTMutex before calling this function. 333static void unref_ft_face(FT_Face face) { 334 SkFaceRec* rec = gFaceRecHead; 335 SkFaceRec* prev = NULL; 336 while (rec) { 337 SkFaceRec* next = rec->fNext; 338 if (rec->fFace == face) { 339 if (--rec->fRefCnt == 0) { 340 if (prev) { 341 prev->fNext = next; 342 } else { 343 gFaceRecHead = next; 344 } 345 FT_Done_Face(face); 346 SkDELETE(rec); 347 } 348 return; 349 } 350 prev = rec; 351 rec = next; 352 } 353 SkDEBUGFAIL("shouldn't get here, face not in list"); 354} 355 356class AutoFTAccess { 357public: 358 AutoFTAccess(const SkTypeface* tf) : fRec(NULL), fFace(NULL) { 359 gFTMutex.acquire(); 360 if (1 == ++gFTCount) { 361 if (!InitFreetype()) { 362 sk_throw(); 363 } 364 } 365 fRec = ref_ft_face(tf); 366 if (fRec) { 367 fFace = fRec->fFace; 368 } 369 } 370 371 ~AutoFTAccess() { 372 if (fFace) { 373 unref_ft_face(fFace); 374 } 375 if (0 == --gFTCount) { 376 FT_Done_FreeType(gFTLibrary); 377 } 378 gFTMutex.release(); 379 } 380 381 SkFaceRec* rec() { return fRec; } 382 FT_Face face() { return fFace; } 383 384private: 385 SkFaceRec* fRec; 386 FT_Face fFace; 387}; 388 389/////////////////////////////////////////////////////////////////////////// 390 391// Work around for old versions of freetype. 392static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count, 393 FT_Int32 loadFlags, FT_Fixed* advances) { 394#ifdef FT_ADVANCES_H 395 return FT_Get_Advances(face, start, count, loadFlags, advances); 396#else 397 if (!face || start >= face->num_glyphs || 398 start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) { 399 return 6; // "Invalid argument." 400 } 401 if (count == 0) 402 return 0; 403 404 for (int i = 0; i < count; i++) { 405 FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE); 406 if (err) 407 return err; 408 advances[i] = face->glyph->advance.x; 409 } 410 411 return 0; 412#endif 413} 414 415static bool canEmbed(FT_Face face) { 416#ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING 417 FT_UShort fsType = FT_Get_FSType_Flags(face); 418 return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | 419 FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; 420#else 421 // No embedding is 0x2 and bitmap embedding only is 0x200. 422 TT_OS2* os2_table; 423 if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { 424 return (os2_table->fsType & 0x202) == 0; 425 } 426 return false; // We tried, fail safe. 427#endif 428} 429 430static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { 431 const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); 432 if (!glyph_id) 433 return false; 434 FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE); 435 FT_Outline_Get_CBox(&face->glyph->outline, bbox); 436 return true; 437} 438 439static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { 440 FT_Fixed advance = 0; 441 if (getAdvances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { 442 return false; 443 } 444 SkASSERT(data); 445 *data = advance; 446 return true; 447} 448 449static void populate_glyph_to_unicode(FT_Face& face, 450 SkTDArray<SkUnichar>* glyphToUnicode) { 451 // Check and see if we have Unicode cmaps. 452 for (int i = 0; i < face->num_charmaps; ++i) { 453 // CMaps known to support Unicode: 454 // Platform ID Encoding ID Name 455 // ----------- ----------- ----------------------------------- 456 // 0 0,1 Apple Unicode 457 // 0 3 Apple Unicode 2.0 (preferred) 458 // 3 1 Microsoft Unicode UCS-2 459 // 3 10 Microsoft Unicode UCS-4 (preferred) 460 // 461 // See Apple TrueType Reference Manual 462 // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6cmap.html 463 // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6name.html#ID 464 // Microsoft OpenType Specification 465 // http://www.microsoft.com/typography/otspec/cmap.htm 466 467 FT_UShort platformId = face->charmaps[i]->platform_id; 468 FT_UShort encodingId = face->charmaps[i]->encoding_id; 469 470 if (platformId != 0 && platformId != 3) { 471 continue; 472 } 473 if (platformId == 3 && encodingId != 1 && encodingId != 10) { 474 continue; 475 } 476 bool preferredMap = ((platformId == 3 && encodingId == 10) || 477 (platformId == 0 && encodingId == 3)); 478 479 FT_Set_Charmap(face, face->charmaps[i]); 480 if (glyphToUnicode->isEmpty()) { 481 glyphToUnicode->setCount(face->num_glyphs); 482 memset(glyphToUnicode->begin(), 0, 483 sizeof(SkUnichar) * face->num_glyphs); 484 } 485 486 // Iterate through each cmap entry. 487 FT_UInt glyphIndex; 488 for (SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); 489 glyphIndex != 0; 490 charCode = FT_Get_Next_Char(face, charCode, &glyphIndex)) { 491 if (charCode && 492 ((*glyphToUnicode)[glyphIndex] == 0 || preferredMap)) { 493 (*glyphToUnicode)[glyphIndex] = charCode; 494 } 495 } 496 } 497} 498 499SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics( 500 SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo, 501 const uint32_t* glyphIDs, 502 uint32_t glyphIDsCount) const { 503#if defined(SK_BUILD_FOR_MAC) 504 return NULL; 505#else 506 AutoFTAccess fta(this); 507 FT_Face face = fta.face(); 508 if (!face) { 509 return NULL; 510 } 511 512 SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; 513 info->fFontName.set(FT_Get_Postscript_Name(face)); 514 info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face); 515 info->fLastGlyphID = face->num_glyphs - 1; 516 info->fEmSize = 1000; 517 518 bool cid = false; 519 const char* fontType = FT_Get_X11_Font_Format(face); 520 if (strcmp(fontType, "Type 1") == 0) { 521 info->fType = SkAdvancedTypefaceMetrics::kType1_Font; 522 } else if (strcmp(fontType, "CID Type 1") == 0) { 523 info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; 524 cid = true; 525 } else if (strcmp(fontType, "CFF") == 0) { 526 info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; 527 } else if (strcmp(fontType, "TrueType") == 0) { 528 info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; 529 cid = true; 530 TT_Header* ttHeader; 531 if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, 532 ft_sfnt_head)) != NULL) { 533 info->fEmSize = ttHeader->Units_Per_EM; 534 } 535 } else { 536 info->fType = SkAdvancedTypefaceMetrics::kOther_Font; 537 } 538 539 info->fStyle = 0; 540 if (FT_IS_FIXED_WIDTH(face)) 541 info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; 542 if (face->style_flags & FT_STYLE_FLAG_ITALIC) 543 info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; 544 545 PS_FontInfoRec ps_info; 546 TT_Postscript* tt_info; 547 if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { 548 info->fItalicAngle = ps_info.italic_angle; 549 } else if ((tt_info = 550 (TT_Postscript*)FT_Get_Sfnt_Table(face, 551 ft_sfnt_post)) != NULL) { 552 info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); 553 } else { 554 info->fItalicAngle = 0; 555 } 556 557 info->fAscent = face->ascender; 558 info->fDescent = face->descender; 559 560 // Figure out a good guess for StemV - Min width of i, I, !, 1. 561 // This probably isn't very good with an italic font. 562 int16_t min_width = SHRT_MAX; 563 info->fStemV = 0; 564 char stem_chars[] = {'i', 'I', '!', '1'}; 565 for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { 566 FT_BBox bbox; 567 if (GetLetterCBox(face, stem_chars[i], &bbox)) { 568 int16_t width = bbox.xMax - bbox.xMin; 569 if (width > 0 && width < min_width) { 570 min_width = width; 571 info->fStemV = min_width; 572 } 573 } 574 } 575 576 TT_PCLT* pclt_info; 577 TT_OS2* os2_table; 578 if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != NULL) { 579 info->fCapHeight = pclt_info->CapHeight; 580 uint8_t serif_style = pclt_info->SerifStyle & 0x3F; 581 if (serif_style >= 2 && serif_style <= 6) 582 info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; 583 else if (serif_style >= 9 && serif_style <= 12) 584 info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; 585 } else if ((os2_table = 586 (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { 587 info->fCapHeight = os2_table->sCapHeight; 588 } else { 589 // Figure out a good guess for CapHeight: average the height of M and X. 590 FT_BBox m_bbox, x_bbox; 591 bool got_m, got_x; 592 got_m = GetLetterCBox(face, 'M', &m_bbox); 593 got_x = GetLetterCBox(face, 'X', &x_bbox); 594 if (got_m && got_x) { 595 info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - 596 x_bbox.yMin) / 2; 597 } else if (got_m && !got_x) { 598 info->fCapHeight = m_bbox.yMax - m_bbox.yMin; 599 } else if (!got_m && got_x) { 600 info->fCapHeight = x_bbox.yMax - x_bbox.yMin; 601 } 602 } 603 604 info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, 605 face->bbox.xMax, face->bbox.yMin); 606 607 if (!canEmbed(face) || !FT_IS_SCALABLE(face) || 608 info->fType == SkAdvancedTypefaceMetrics::kOther_Font) { 609 perGlyphInfo = SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo; 610 } 611 612 if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { 613 if (FT_IS_FIXED_WIDTH(face)) { 614 appendRange(&info->fGlyphWidths, 0); 615 int16_t advance = face->max_advance_width; 616 info->fGlyphWidths->fAdvance.append(1, &advance); 617 finishRange(info->fGlyphWidths.get(), 0, 618 SkAdvancedTypefaceMetrics::WidthRange::kDefault); 619 } else if (!cid) { 620 appendRange(&info->fGlyphWidths, 0); 621 // So as to not blow out the stack, get advances in batches. 622 for (int gID = 0; gID < face->num_glyphs; gID += 128) { 623 FT_Fixed advances[128]; 624 int advanceCount = 128; 625 if (gID + advanceCount > face->num_glyphs) 626 advanceCount = face->num_glyphs - gID; 627 getAdvances(face, gID, advanceCount, FT_LOAD_NO_SCALE, 628 advances); 629 for (int i = 0; i < advanceCount; i++) { 630 int16_t advance = advances[i]; 631 info->fGlyphWidths->fAdvance.append(1, &advance); 632 } 633 } 634 finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, 635 SkAdvancedTypefaceMetrics::WidthRange::kRange); 636 } else { 637 info->fGlyphWidths.reset( 638 getAdvanceData(face, 639 face->num_glyphs, 640 glyphIDs, 641 glyphIDsCount, 642 &getWidthAdvance)); 643 } 644 } 645 646 if (perGlyphInfo & SkAdvancedTypefaceMetrics::kVAdvance_PerGlyphInfo && 647 FT_HAS_VERTICAL(face)) { 648 SkASSERT(false); // Not implemented yet. 649 } 650 651 if (perGlyphInfo & SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo && 652 info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { 653 // Postscript fonts may contain more than 255 glyphs, so we end up 654 // using multiple font descriptions with a glyph ordering. Record 655 // the name of each glyph. 656 info->fGlyphNames.reset( 657 new SkAutoTArray<SkString>(face->num_glyphs)); 658 for (int gID = 0; gID < face->num_glyphs; gID++) { 659 char glyphName[128]; // PS limit for names is 127 bytes. 660 FT_Get_Glyph_Name(face, gID, glyphName, 128); 661 info->fGlyphNames->get()[gID].set(glyphName); 662 } 663 } 664 665 if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo && 666 info->fType != SkAdvancedTypefaceMetrics::kType1_Font && 667 face->num_charmaps) { 668 populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); 669 } 670 671 if (!canEmbed(face)) 672 info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; 673 674 return info; 675#endif 676} 677 678/////////////////////////////////////////////////////////////////////////// 679 680#define BLACK_LUMINANCE_LIMIT 0x40 681#define WHITE_LUMINANCE_LIMIT 0xA0 682 683static bool bothZero(SkScalar a, SkScalar b) { 684 return 0 == a && 0 == b; 685} 686 687// returns false if there is any non-90-rotation or skew 688static bool isAxisAligned(const SkScalerContext::Rec& rec) { 689 return 0 == rec.fPreSkewX && 690 (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || 691 bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); 692} 693 694SkScalerContext* SkTypeface_FreeType::onCreateScalerContext( 695 const SkDescriptor* desc) const { 696 SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, 697 (const_cast<SkTypeface_FreeType*>(this), 698 desc)); 699 if (!c->success()) { 700 SkDELETE(c); 701 c = NULL; 702 } 703 return c; 704} 705 706void SkTypeface_FreeType::onFilterRec(SkScalerContextRec* rec) const { 707 //BOGUS: http://code.google.com/p/chromium/issues/detail?id=121119 708 //Cap the requested size as larger sizes give bogus values. 709 //Remove when http://code.google.com/p/skia/issues/detail?id=554 is fixed. 710 if (rec->fTextSize > SkIntToScalar(1 << 14)) { 711 rec->fTextSize = SkIntToScalar(1 << 14); 712 } 713 714 if (!is_lcd_supported() && isLCD(*rec)) { 715 // If the runtime Freetype library doesn't support LCD mode, we disable 716 // it here. 717 rec->fMaskFormat = SkMask::kA8_Format; 718 } 719 720 SkPaint::Hinting h = rec->getHinting(); 721 if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { 722 // collapse full->normal hinting if we're not doing LCD 723 h = SkPaint::kNormal_Hinting; 724 } 725 if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag)) { 726 if (SkPaint::kNo_Hinting != h) { 727 h = SkPaint::kSlight_Hinting; 728 } 729 } 730 731 // rotated text looks bad with hinting, so we disable it as needed 732 if (!isAxisAligned(*rec)) { 733 h = SkPaint::kNo_Hinting; 734 } 735 rec->setHinting(h); 736 737#ifndef SK_GAMMA_APPLY_TO_A8 738 if (!isLCD(*rec)) { 739 rec->ignorePreBlend(); 740 } 741#endif 742} 743 744int SkTypeface_FreeType::onGetUPEM() const { 745 AutoFTAccess fta(this); 746 FT_Face face = fta.face(); 747 return face ? face->units_per_EM : 0; 748} 749 750bool SkTypeface_FreeType::onGetKerningPairAdjustments(const uint16_t glyphs[], 751 int count, int32_t adjustments[]) const { 752 AutoFTAccess fta(this); 753 FT_Face face = fta.face(); 754 if (!face || !FT_HAS_KERNING(face)) { 755 return false; 756 } 757 758 for (int i = 0; i < count - 1; ++i) { 759 FT_Vector delta; 760 FT_Error err = FT_Get_Kerning(face, glyphs[i], glyphs[i+1], 761 FT_KERNING_UNSCALED, &delta); 762 if (err) { 763 return false; 764 } 765 adjustments[i] = delta.x; 766 } 767 return true; 768} 769 770static FT_Int chooseBitmapStrike(FT_Face face, SkFixed scaleY) { 771 // early out if face is bad 772 if (face == NULL) { 773 SkDEBUGF(("chooseBitmapStrike aborted due to NULL face\n")); 774 return -1; 775 } 776 // determine target ppem 777 FT_Pos targetPPEM = SkFixedToFDot6(scaleY); 778 // find a bitmap strike equal to or just larger than the requested size 779 FT_Int chosenStrikeIndex = -1; 780 FT_Pos chosenPPEM = 0; 781 for (FT_Int strikeIndex = 0; strikeIndex < face->num_fixed_sizes; ++strikeIndex) { 782 FT_Pos thisPPEM = face->available_sizes[strikeIndex].y_ppem; 783 if (thisPPEM == targetPPEM) { 784 // exact match - our search stops here 785 chosenPPEM = thisPPEM; 786 chosenStrikeIndex = strikeIndex; 787 break; 788 } else if (chosenPPEM < targetPPEM) { 789 // attempt to increase chosenPPEM 790 if (thisPPEM > chosenPPEM) { 791 chosenPPEM = thisPPEM; 792 chosenStrikeIndex = strikeIndex; 793 } 794 } else { 795 // attempt to decrease chosenPPEM, but not below targetPPEM 796 if (thisPPEM < chosenPPEM && thisPPEM > targetPPEM) { 797 chosenPPEM = thisPPEM; 798 chosenStrikeIndex = strikeIndex; 799 } 800 } 801 } 802 if (chosenStrikeIndex != -1) { 803 // use the chosen strike 804 FT_Error err = FT_Select_Size(face, chosenStrikeIndex); 805 if (err != 0) { 806 SkDEBUGF(("FT_Select_Size(%s, %d) returned 0x%x\n", face->family_name, 807 chosenStrikeIndex, err)); 808 chosenStrikeIndex = -1; 809 } 810 } 811 return chosenStrikeIndex; 812} 813 814SkScalerContext_FreeType::SkScalerContext_FreeType(SkTypeface* typeface, 815 const SkDescriptor* desc) 816 : SkScalerContext_FreeType_Base(typeface, desc) { 817 SkAutoMutexAcquire ac(gFTMutex); 818 819 if (gFTCount == 0) { 820 if (!InitFreetype()) { 821 sk_throw(); 822 } 823 } 824 ++gFTCount; 825 826 // load the font file 827 fStrikeIndex = -1; 828 fFTSize = NULL; 829 fFace = NULL; 830 fFaceRec = ref_ft_face(typeface); 831 if (NULL == fFaceRec) { 832 return; 833 } 834 fFace = fFaceRec->fFace; 835 836 // compute our factors from the record 837 838 SkMatrix m; 839 840 fRec.getSingleMatrix(&m); 841 842#ifdef DUMP_STRIKE_CREATION 843 SkString keyString; 844 SkFontHost::GetDescriptorKeyString(desc, &keyString); 845 printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize), 846 SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), 847 SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]), 848 SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]), 849 fRec.getHinting(), fRec.fMaskFormat, keyString.c_str()); 850#endif 851 852 // now compute our scale factors 853 SkScalar sx = m.getScaleX(); 854 SkScalar sy = m.getScaleY(); 855 856 fMatrix22Scalar.reset(); 857 858 if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { 859 // sort of give up on hinting 860 sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); 861 sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); 862 sx = sy = SkScalarAve(sx, sy); 863 864 SkScalar inv = SkScalarInvert(sx); 865 866 // flip the skew elements to go from our Y-down system to FreeType's 867 fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); 868 fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); 869 fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); 870 fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); 871 872 fMatrix22Scalar.setScaleX(SkScalarMul(m.getScaleX(), inv)); 873 fMatrix22Scalar.setSkewX(-SkScalarMul(m.getSkewX(), inv)); 874 fMatrix22Scalar.setSkewY(-SkScalarMul(m.getSkewY(), inv)); 875 fMatrix22Scalar.setScaleY(SkScalarMul(m.getScaleY(), inv)); 876 } else { 877 fMatrix22.xx = fMatrix22.yy = SK_Fixed1; 878 fMatrix22.xy = fMatrix22.yx = 0; 879 } 880 fScale.set(sx, sy); 881 fScaleX = SkScalarToFixed(sx); 882 fScaleY = SkScalarToFixed(sy); 883 884 fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); 885 886 // compute the flags we send to Load_Glyph 887 bool linearMetrics = SkToBool(fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag); 888 { 889 FT_Int32 loadFlags = FT_LOAD_DEFAULT; 890 891 if (SkMask::kBW_Format == fRec.fMaskFormat) { 892 // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 893 loadFlags = FT_LOAD_TARGET_MONO; 894 if (fRec.getHinting() == SkPaint::kNo_Hinting) { 895 loadFlags = FT_LOAD_NO_HINTING; 896 linearMetrics = true; 897 } 898 } else { 899 switch (fRec.getHinting()) { 900 case SkPaint::kNo_Hinting: 901 loadFlags = FT_LOAD_NO_HINTING; 902 linearMetrics = true; 903 break; 904 case SkPaint::kSlight_Hinting: 905 loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT 906 break; 907 case SkPaint::kNormal_Hinting: 908 if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) 909 loadFlags = FT_LOAD_FORCE_AUTOHINT; 910 else 911 loadFlags = FT_LOAD_NO_AUTOHINT; 912 break; 913 case SkPaint::kFull_Hinting: 914 if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) { 915 loadFlags = FT_LOAD_FORCE_AUTOHINT; 916 break; 917 } 918 loadFlags = FT_LOAD_TARGET_NORMAL; 919 if (isLCD(fRec)) { 920 if (fLCDIsVert) { 921 loadFlags = FT_LOAD_TARGET_LCD_V; 922 } else { 923 loadFlags = FT_LOAD_TARGET_LCD; 924 } 925 } 926 break; 927 default: 928 SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); 929 break; 930 } 931 } 932 933 if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { 934 loadFlags |= FT_LOAD_NO_BITMAP; 935 } 936 937 // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct 938 // advances, as fontconfig and cairo do. 939 // See http://code.google.com/p/skia/issues/detail?id=222. 940 loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; 941 942 // Use vertical layout if requested. 943 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 944 loadFlags |= FT_LOAD_VERTICAL_LAYOUT; 945 } 946 947 loadFlags |= FT_LOAD_COLOR; 948 949 fLoadGlyphFlags = loadFlags; 950 } 951 952 FT_Error err = FT_New_Size(fFace, &fFTSize); 953 if (err != 0) { 954 SkDEBUGF(("FT_New_Size returned %x for face %s\n", err, fFace->family_name)); 955 fFace = NULL; 956 return; 957 } 958 err = FT_Activate_Size(fFTSize); 959 if (err != 0) { 960 SkDEBUGF(("FT_Activate_Size(%08x, 0x%x, 0x%x) returned 0x%x\n", fFace, fScaleX, fScaleY, 961 err)); 962 fFTSize = NULL; 963 return; 964 } 965 966 if (FT_IS_SCALABLE(fFace)) { 967 err = FT_Set_Char_Size(fFace, SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY), 72, 72); 968 if (err != 0) { 969 SkDEBUGF(("FT_Set_CharSize(%08x, 0x%x, 0x%x) returned 0x%x\n", 970 fFace, fScaleX, fScaleY, err)); 971 fFace = NULL; 972 return; 973 } 974 FT_Set_Transform(fFace, &fMatrix22, NULL); 975 } else if (FT_HAS_FIXED_SIZES(fFace)) { 976 fStrikeIndex = chooseBitmapStrike(fFace, fScaleY); 977 if (fStrikeIndex == -1) { 978 SkDEBUGF(("no glyphs for font \"%s\" size %f?\n", 979 fFace->family_name, SkFixedToScalar(fScaleY))); 980 } else { 981 // FreeType does no provide linear metrics for bitmap fonts. 982 linearMetrics = false; 983 984 // FreeType documentation says: 985 // FT_LOAD_NO_BITMAP -- Ignore bitmap strikes when loading. 986 // Bitmap-only fonts ignore this flag. 987 // 988 // However, in FreeType 2.5.1 color bitmap only fonts do not ignore this flag. 989 // Force this flag off for bitmap only fonts. 990 fLoadGlyphFlags &= ~FT_LOAD_NO_BITMAP; 991 } 992 } else { 993 SkDEBUGF(("unknown kind of font \"%s\" size %f?\n", 994 fFace->family_name, SkFixedToScalar(fScaleY))); 995 } 996 997 fDoLinearMetrics = linearMetrics; 998} 999 1000SkScalerContext_FreeType::~SkScalerContext_FreeType() { 1001 SkAutoMutexAcquire ac(gFTMutex); 1002 1003 if (fFTSize != NULL) { 1004 FT_Done_Size(fFTSize); 1005 } 1006 1007 if (fFace != NULL) { 1008 unref_ft_face(fFace); 1009 } 1010 if (--gFTCount == 0) { 1011 FT_Done_FreeType(gFTLibrary); 1012 SkDEBUGCODE(gFTLibrary = NULL;) 1013 } 1014} 1015 1016/* We call this before each use of the fFace, since we may be sharing 1017 this face with other context (at different sizes). 1018*/ 1019FT_Error SkScalerContext_FreeType::setupSize() { 1020 FT_Error err = FT_Activate_Size(fFTSize); 1021 if (err != 0) { 1022 SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", 1023 fFaceRec->fFontID, fScaleX, fScaleY, err)); 1024 fFTSize = NULL; 1025 return err; 1026 } 1027 1028 // seems we need to reset this every time (not sure why, but without it 1029 // I get random italics from some other fFTSize) 1030 FT_Set_Transform(fFace, &fMatrix22, NULL); 1031 return 0; 1032} 1033 1034unsigned SkScalerContext_FreeType::generateGlyphCount() { 1035 return fFace->num_glyphs; 1036} 1037 1038uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { 1039 return SkToU16(FT_Get_Char_Index( fFace, uni )); 1040} 1041 1042SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { 1043 // iterate through each cmap entry, looking for matching glyph indices 1044 FT_UInt glyphIndex; 1045 SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); 1046 1047 while (glyphIndex != 0) { 1048 if (glyphIndex == glyph) { 1049 return charCode; 1050 } 1051 charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); 1052 } 1053 1054 return 0; 1055} 1056 1057void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { 1058#ifdef FT_ADVANCES_H 1059 /* unhinted and light hinted text have linearly scaled advances 1060 * which are very cheap to compute with some font formats... 1061 */ 1062 if (fDoLinearMetrics) { 1063 SkAutoMutexAcquire ac(gFTMutex); 1064 1065 if (this->setupSize()) { 1066 glyph->zeroMetrics(); 1067 return; 1068 } 1069 1070 FT_Error error; 1071 FT_Fixed advance; 1072 1073 error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), 1074 fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, 1075 &advance ); 1076 if (0 == error) { 1077 glyph->fRsbDelta = 0; 1078 glyph->fLsbDelta = 0; 1079 glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); 1080 glyph->fAdvanceY = - SkFixedMul(fMatrix22.yx, advance); 1081 return; 1082 } 1083 } 1084#endif /* FT_ADVANCES_H */ 1085 /* otherwise, we need to load/hint the glyph, which is slower */ 1086 this->generateMetrics(glyph); 1087 return; 1088} 1089 1090void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, 1091 FT_BBox* bbox, 1092 bool snapToPixelBoundary) { 1093 1094 FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); 1095 1096 if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { 1097 int dx = SkFixedToFDot6(glyph->getSubXFixed()); 1098 int dy = SkFixedToFDot6(glyph->getSubYFixed()); 1099 // negate dy since freetype-y-goes-up and skia-y-goes-down 1100 bbox->xMin += dx; 1101 bbox->yMin -= dy; 1102 bbox->xMax += dx; 1103 bbox->yMax -= dy; 1104 } 1105 1106 // outset the box to integral boundaries 1107 if (snapToPixelBoundary) { 1108 bbox->xMin &= ~63; 1109 bbox->yMin &= ~63; 1110 bbox->xMax = (bbox->xMax + 63) & ~63; 1111 bbox->yMax = (bbox->yMax + 63) & ~63; 1112 } 1113 1114 // Must come after snapToPixelBoundary so that the width and height are 1115 // consistent. Otherwise asserts will fire later on when generating the 1116 // glyph image. 1117 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1118 FT_Vector vector; 1119 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1120 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1121 FT_Vector_Transform(&vector, &fMatrix22); 1122 bbox->xMin += vector.x; 1123 bbox->xMax += vector.x; 1124 bbox->yMin += vector.y; 1125 bbox->yMax += vector.y; 1126 } 1127} 1128 1129void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { 1130 if (isLCD(fRec)) { 1131 if (fLCDIsVert) { 1132 glyph->fHeight += gLCDExtra; 1133 glyph->fTop -= gLCDExtra >> 1; 1134 } else { 1135 glyph->fWidth += gLCDExtra; 1136 glyph->fLeft -= gLCDExtra >> 1; 1137 } 1138 } 1139} 1140 1141inline void scaleGlyphMetrics(SkGlyph& glyph, SkScalar scale) { 1142 glyph.fWidth *= scale; 1143 glyph.fHeight *= scale; 1144 glyph.fTop *= scale; 1145 glyph.fLeft *= scale; 1146 1147 SkFixed fixedScale = SkScalarToFixed(scale); 1148 glyph.fAdvanceX = SkFixedMul(glyph.fAdvanceX, fixedScale); 1149 glyph.fAdvanceY = SkFixedMul(glyph.fAdvanceY, fixedScale); 1150} 1151 1152void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { 1153 SkAutoMutexAcquire ac(gFTMutex); 1154 1155 glyph->fRsbDelta = 0; 1156 glyph->fLsbDelta = 0; 1157 1158 FT_Error err; 1159 1160 if (this->setupSize()) { 1161 goto ERROR; 1162 } 1163 1164 err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); 1165 if (err != 0) { 1166#if 0 1167 SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%x) returned 0x%x\n", 1168 fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); 1169#endif 1170 ERROR: 1171 glyph->zeroMetrics(); 1172 return; 1173 } 1174 1175 switch ( fFace->glyph->format ) { 1176 case FT_GLYPH_FORMAT_OUTLINE: 1177 if (0 == fFace->glyph->outline.n_contours) { 1178 glyph->fWidth = 0; 1179 glyph->fHeight = 0; 1180 glyph->fTop = 0; 1181 glyph->fLeft = 0; 1182 } else { 1183 if (fRec.fFlags & kEmbolden_Flag && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { 1184 emboldenOutline(fFace, &fFace->glyph->outline); 1185 } 1186 1187 FT_BBox bbox; 1188 getBBoxForCurrentGlyph(glyph, &bbox, true); 1189 1190 glyph->fWidth = SkToU16(SkFDot6Floor(bbox.xMax - bbox.xMin)); 1191 glyph->fHeight = SkToU16(SkFDot6Floor(bbox.yMax - bbox.yMin)); 1192 glyph->fTop = -SkToS16(SkFDot6Floor(bbox.yMax)); 1193 glyph->fLeft = SkToS16(SkFDot6Floor(bbox.xMin)); 1194 1195 updateGlyphIfLCD(glyph); 1196 } 1197 break; 1198 1199 case FT_GLYPH_FORMAT_BITMAP: 1200 if (fRec.fFlags & kEmbolden_Flag) { 1201 FT_GlyphSlot_Own_Bitmap(fFace->glyph); 1202 FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); 1203 } 1204 1205 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1206 FT_Vector vector; 1207 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1208 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1209 FT_Vector_Transform(&vector, &fMatrix22); 1210 fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); 1211 fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); 1212 } 1213 1214 if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) { 1215 glyph->fMaskFormat = SkMask::kARGB32_Format; 1216 } 1217 1218 glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); 1219 glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); 1220 glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); 1221 glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); 1222 break; 1223 1224 default: 1225 SkDEBUGFAIL("unknown glyph format"); 1226 goto ERROR; 1227 } 1228 1229 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1230 if (fDoLinearMetrics) { 1231 glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); 1232 glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); 1233 } else { 1234 glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); 1235 glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); 1236 } 1237 } else { 1238 if (fDoLinearMetrics) { 1239 glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); 1240 glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); 1241 } else { 1242 glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); 1243 glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); 1244 1245 if (fRec.fFlags & kDevKernText_Flag) { 1246 glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); 1247 glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); 1248 } 1249 } 1250 } 1251 1252 if (fFace->glyph->format == FT_GLYPH_FORMAT_BITMAP && fScaleY && fFace->size->metrics.y_ppem) { 1253 // NOTE: both dimensions are scaled by y_ppem. this is WAI. 1254 scaleGlyphMetrics(*glyph, SkScalarDiv(SkFixedToScalar(fScaleY), 1255 SkIntToScalar(fFace->size->metrics.y_ppem))); 1256 } 1257 1258#ifdef ENABLE_GLYPH_SPEW 1259 SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); 1260 SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, glyph->fWidth)); 1261#endif 1262} 1263 1264 1265void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { 1266 SkAutoMutexAcquire ac(gFTMutex); 1267 1268 FT_Error err; 1269 1270 if (this->setupSize()) { 1271 goto ERROR; 1272 } 1273 1274 err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags); 1275 if (err != 0) { 1276 SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", 1277 glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); 1278 ERROR: 1279 memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); 1280 return; 1281 } 1282 1283 generateGlyphImage(fFace, glyph); 1284} 1285 1286 1287void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, 1288 SkPath* path) { 1289 SkAutoMutexAcquire ac(gFTMutex); 1290 1291 SkASSERT(&glyph && path); 1292 1293 if (this->setupSize()) { 1294 path->reset(); 1295 return; 1296 } 1297 1298 uint32_t flags = fLoadGlyphFlags; 1299 flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline 1300 flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) 1301 1302 FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flags); 1303 1304 if (err != 0) { 1305 SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", 1306 glyph.getGlyphID(fBaseGlyphCount), flags, err)); 1307 path->reset(); 1308 return; 1309 } 1310 1311 generateGlyphPath(fFace, path); 1312 1313 // The path's origin from FreeType is always the horizontal layout origin. 1314 // Offset the path so that it is relative to the vertical origin if needed. 1315 if (fRec.fFlags & SkScalerContext::kVertical_Flag) { 1316 FT_Vector vector; 1317 vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; 1318 vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; 1319 FT_Vector_Transform(&vector, &fMatrix22); 1320 path->offset(SkFDot6ToScalar(vector.x), -SkFDot6ToScalar(vector.y)); 1321 } 1322} 1323 1324void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, 1325 SkPaint::FontMetrics* my) { 1326 if (NULL == mx && NULL == my) { 1327 return; 1328 } 1329 1330 SkAutoMutexAcquire ac(gFTMutex); 1331 1332 if (this->setupSize()) { 1333 ERROR: 1334 if (mx) { 1335 sk_bzero(mx, sizeof(SkPaint::FontMetrics)); 1336 } 1337 if (my) { 1338 sk_bzero(my, sizeof(SkPaint::FontMetrics)); 1339 } 1340 return; 1341 } 1342 1343 FT_Face face = fFace; 1344 SkScalar scaleX = fScale.x(); 1345 SkScalar scaleY = fScale.y(); 1346 SkScalar mxy = fMatrix22Scalar.getSkewX() * scaleY; 1347 SkScalar myy = fMatrix22Scalar.getScaleY() * scaleY; 1348 1349 // fetch units/EM from "head" table if needed (ie for bitmap fonts) 1350 SkScalar upem = SkIntToScalar(face->units_per_EM); 1351 if (!upem) { 1352 TT_Header* ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, ft_sfnt_head); 1353 if (ttHeader) { 1354 upem = SkIntToScalar(ttHeader->Units_Per_EM); 1355 } 1356 } 1357 1358 // use the os/2 table as a source of reasonable defaults. 1359 SkScalar x_height = 0.0f; 1360 SkScalar avgCharWidth = 0.0f; 1361 TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); 1362 if (os2) { 1363 x_height = scaleX * SkIntToScalar(os2->sxHeight) / upem; 1364 avgCharWidth = SkIntToScalar(os2->xAvgCharWidth) / upem; 1365 } 1366 1367 // pull from format-specific metrics as needed 1368 SkScalar ascent, descent, leading, xmin, xmax, ymin, ymax; 1369 if (face->face_flags & FT_FACE_FLAG_SCALABLE) { // scalable outline font 1370 ascent = -SkIntToScalar(face->ascender) / upem; 1371 descent = -SkIntToScalar(face->descender) / upem; 1372 leading = SkIntToScalar(face->height + (face->descender - face->ascender)) / upem; 1373 xmin = SkIntToScalar(face->bbox.xMin) / upem; 1374 xmax = SkIntToScalar(face->bbox.xMax) / upem; 1375 ymin = -SkIntToScalar(face->bbox.yMin) / upem; 1376 ymax = -SkIntToScalar(face->bbox.yMax) / upem; 1377 // we may be able to synthesize x_height from outline 1378 if (!x_height) { 1379 const FT_UInt x_glyph = FT_Get_Char_Index(fFace, 'x'); 1380 if (x_glyph) { 1381 FT_BBox bbox; 1382 FT_Load_Glyph(fFace, x_glyph, fLoadGlyphFlags); 1383 if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { 1384 emboldenOutline(fFace, &fFace->glyph->outline); 1385 } 1386 FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); 1387 x_height = SkIntToScalar(bbox.yMax) / 64.0f; 1388 } 1389 } 1390 } else if (fStrikeIndex != -1) { // bitmap strike metrics 1391 SkScalar xppem = SkIntToScalar(face->size->metrics.x_ppem); 1392 SkScalar yppem = SkIntToScalar(face->size->metrics.y_ppem); 1393 ascent = -SkIntToScalar(face->size->metrics.ascender) / (yppem * 64.0f); 1394 descent = -SkIntToScalar(face->size->metrics.descender) / (yppem * 64.0f); 1395 leading = (SkIntToScalar(face->size->metrics.height) / (yppem * 64.0f)) 1396 + ascent - descent; 1397 xmin = 0.0f; 1398 xmax = SkIntToScalar(face->available_sizes[fStrikeIndex].width) / xppem; 1399 ymin = descent + leading; 1400 ymax = ascent - descent; 1401 if (!x_height) { 1402 x_height = -ascent; 1403 } 1404 if (!avgCharWidth) { 1405 avgCharWidth = xmax - xmin; 1406 } 1407 } else { 1408 goto ERROR; 1409 } 1410 1411 // synthesize elements that were not provided by the os/2 table or format-specific metrics 1412 if (!x_height) { 1413 x_height = -ascent; 1414 } 1415 if (!avgCharWidth) { 1416 avgCharWidth = xmax - xmin; 1417 } 1418 1419 // disallow negative linespacing 1420 if (leading < 0.0f) { 1421 leading = 0.0f; 1422 } 1423 1424 if (mx) { 1425 mx->fTop = ymax * mxy; 1426 mx->fAscent = ascent * mxy; 1427 mx->fDescent = descent * mxy; 1428 mx->fBottom = ymin * mxy; 1429 mx->fLeading = leading * mxy; 1430 mx->fAvgCharWidth = avgCharWidth * mxy; 1431 mx->fXMin = xmin; 1432 mx->fXMax = xmax; 1433 mx->fXHeight = x_height; 1434 } 1435 if (my) { 1436 my->fTop = ymax * myy; 1437 my->fAscent = ascent * myy; 1438 my->fDescent = descent * myy; 1439 my->fBottom = ymin * myy; 1440 my->fLeading = leading * myy; 1441 my->fAvgCharWidth = avgCharWidth * myy; 1442 my->fXMin = xmin; 1443 my->fXMax = xmax; 1444 my->fXHeight = x_height; 1445 } 1446} 1447 1448/////////////////////////////////////////////////////////////////////////////// 1449 1450#include "SkUtils.h" 1451 1452static SkUnichar next_utf8(const void** chars) { 1453 return SkUTF8_NextUnichar((const char**)chars); 1454} 1455 1456static SkUnichar next_utf16(const void** chars) { 1457 return SkUTF16_NextUnichar((const uint16_t**)chars); 1458} 1459 1460static SkUnichar next_utf32(const void** chars) { 1461 const SkUnichar** uniChars = (const SkUnichar**)chars; 1462 SkUnichar uni = **uniChars; 1463 *uniChars += 1; 1464 return uni; 1465} 1466 1467typedef SkUnichar (*EncodingProc)(const void**); 1468 1469static EncodingProc find_encoding_proc(SkTypeface::Encoding enc) { 1470 static const EncodingProc gProcs[] = { 1471 next_utf8, next_utf16, next_utf32 1472 }; 1473 SkASSERT((size_t)enc < SK_ARRAY_COUNT(gProcs)); 1474 return gProcs[enc]; 1475} 1476 1477int SkTypeface_FreeType::onCharsToGlyphs(const void* chars, Encoding encoding, 1478 uint16_t glyphs[], int glyphCount) const { 1479 AutoFTAccess fta(this); 1480 FT_Face face = fta.face(); 1481 if (!face) { 1482 if (glyphs) { 1483 sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); 1484 } 1485 return 0; 1486 } 1487 1488 EncodingProc next_uni_proc = find_encoding_proc(encoding); 1489 1490 if (NULL == glyphs) { 1491 for (int i = 0; i < glyphCount; ++i) { 1492 if (0 == FT_Get_Char_Index(face, next_uni_proc(&chars))) { 1493 return i; 1494 } 1495 } 1496 return glyphCount; 1497 } else { 1498 int first = glyphCount; 1499 for (int i = 0; i < glyphCount; ++i) { 1500 unsigned id = FT_Get_Char_Index(face, next_uni_proc(&chars)); 1501 glyphs[i] = SkToU16(id); 1502 if (0 == id && i < first) { 1503 first = i; 1504 } 1505 } 1506 return first; 1507 } 1508} 1509 1510int SkTypeface_FreeType::onCountGlyphs() const { 1511 // we cache this value, using -1 as a sentinel for "not computed" 1512 if (fGlyphCount < 0) { 1513 AutoFTAccess fta(this); 1514 FT_Face face = fta.face(); 1515 // if the face failed, we still assign a non-negative value 1516 fGlyphCount = face ? face->num_glyphs : 0; 1517 } 1518 return fGlyphCount; 1519} 1520 1521SkTypeface::LocalizedStrings* SkTypeface_FreeType::onCreateFamilyNameIterator() const { 1522 SkTypeface::LocalizedStrings* nameIter = 1523 SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this); 1524 if (NULL == nameIter) { 1525 SkString familyName; 1526 this->getFamilyName(&familyName); 1527 SkString language("und"); //undetermined 1528 nameIter = new SkOTUtils::LocalizedStrings_SingleName(familyName, language); 1529 } 1530 return nameIter; 1531} 1532 1533int SkTypeface_FreeType::onGetTableTags(SkFontTableTag tags[]) const { 1534 AutoFTAccess fta(this); 1535 FT_Face face = fta.face(); 1536 1537 FT_ULong tableCount = 0; 1538 FT_Error error; 1539 1540 // When 'tag' is NULL, returns number of tables in 'length'. 1541 error = FT_Sfnt_Table_Info(face, 0, NULL, &tableCount); 1542 if (error) { 1543 return 0; 1544 } 1545 1546 if (tags) { 1547 for (FT_ULong tableIndex = 0; tableIndex < tableCount; ++tableIndex) { 1548 FT_ULong tableTag; 1549 FT_ULong tablelength; 1550 error = FT_Sfnt_Table_Info(face, tableIndex, &tableTag, &tablelength); 1551 if (error) { 1552 return 0; 1553 } 1554 tags[tableIndex] = static_cast<SkFontTableTag>(tableTag); 1555 } 1556 } 1557 return tableCount; 1558} 1559 1560size_t SkTypeface_FreeType::onGetTableData(SkFontTableTag tag, size_t offset, 1561 size_t length, void* data) const 1562{ 1563 AutoFTAccess fta(this); 1564 FT_Face face = fta.face(); 1565 1566 FT_ULong tableLength = 0; 1567 FT_Error error; 1568 1569 // When 'length' is 0 it is overwritten with the full table length; 'offset' is ignored. 1570 error = FT_Load_Sfnt_Table(face, tag, 0, NULL, &tableLength); 1571 if (error) { 1572 return 0; 1573 } 1574 1575 if (offset > tableLength) { 1576 return 0; 1577 } 1578 FT_ULong size = SkTMin((FT_ULong)length, tableLength - (FT_ULong)offset); 1579 if (NULL != data) { 1580 error = FT_Load_Sfnt_Table(face, tag, offset, reinterpret_cast<FT_Byte*>(data), &size); 1581 if (error) { 1582 return 0; 1583 } 1584 } 1585 1586 return size; 1587} 1588 1589/////////////////////////////////////////////////////////////////////////////// 1590/////////////////////////////////////////////////////////////////////////////// 1591 1592/* Export this so that other parts of our FonttHost port can make use of our 1593 ability to extract the name+style from a stream, using FreeType's api. 1594*/ 1595bool find_name_and_attributes(SkStream* stream, SkString* name, 1596 SkTypeface::Style* style, bool* isFixedPitch) { 1597 FT_Library library; 1598 if (FT_Init_FreeType(&library)) { 1599 return false; 1600 } 1601 1602 FT_Open_Args args; 1603 memset(&args, 0, sizeof(args)); 1604 1605 const void* memoryBase = stream->getMemoryBase(); 1606 FT_StreamRec streamRec; 1607 1608 if (NULL != memoryBase) { 1609 args.flags = FT_OPEN_MEMORY; 1610 args.memory_base = (const FT_Byte*)memoryBase; 1611 args.memory_size = stream->getLength(); 1612 } else { 1613 memset(&streamRec, 0, sizeof(streamRec)); 1614 streamRec.size = stream->getLength(); 1615 streamRec.descriptor.pointer = stream; 1616 streamRec.read = sk_stream_read; 1617 streamRec.close = sk_stream_close; 1618 1619 args.flags = FT_OPEN_STREAM; 1620 args.stream = &streamRec; 1621 } 1622 1623 FT_Face face; 1624 if (FT_Open_Face(library, &args, 0, &face)) { 1625 FT_Done_FreeType(library); 1626 return false; 1627 } 1628 1629 int tempStyle = SkTypeface::kNormal; 1630 if (face->style_flags & FT_STYLE_FLAG_BOLD) { 1631 tempStyle |= SkTypeface::kBold; 1632 } 1633 if (face->style_flags & FT_STYLE_FLAG_ITALIC) { 1634 tempStyle |= SkTypeface::kItalic; 1635 } 1636 1637 if (name) { 1638 name->set(face->family_name); 1639 } 1640 if (style) { 1641 *style = (SkTypeface::Style) tempStyle; 1642 } 1643 if (isFixedPitch) { 1644 *isFixedPitch = FT_IS_FIXED_WIDTH(face); 1645 } 1646 1647 FT_Done_Face(face); 1648 FT_Done_FreeType(library); 1649 return true; 1650} 1651