| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkAdvancedTypefaceMetrics.h" |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkColorPriv.h" |
| #include "SkDescriptor.h" |
| #include "SkFDot6.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontHost_FreeType_common.h" |
| #include "SkGlyph.h" |
| #include "SkMask.h" |
| #include "SkMaskGamma.h" |
| #include "SkMatrix22.h" |
| #include "SkMutex.h" |
| #include "SkOTUtils.h" |
| #include "SkPath.h" |
| #include "SkScalerContext.h" |
| #include "SkStream.h" |
| #include "SkString.h" |
| #include "SkTemplates.h" |
| #include "SkTypes.h" |
| #include "SkUniquePtr.h" |
| |
| #if defined(SK_CAN_USE_DLOPEN) |
| #include <dlfcn.h> |
| #endif |
| #include <ft2build.h> |
| #include FT_ADVANCES_H |
| #include FT_BITMAP_H |
| #include FT_FREETYPE_H |
| #include FT_LCD_FILTER_H |
| #include FT_MODULE_H |
| #include FT_MULTIPLE_MASTERS_H |
| #include FT_OUTLINE_H |
| #include FT_SIZES_H |
| #include FT_SYSTEM_H |
| #include FT_TRUETYPE_TABLES_H |
| #include FT_TYPE1_TABLES_H |
| #include FT_XFREE86_H |
| |
| // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA |
| // were introduced in FreeType 2.5.0. |
| // The following may be removed once FreeType 2.5.0 is required to build. |
| #ifndef FT_LOAD_COLOR |
| # define FT_LOAD_COLOR ( 1L << 20 ) |
| # define FT_PIXEL_MODE_BGRA 7 |
| #endif |
| |
| //#define ENABLE_GLYPH_SPEW // for tracing calls |
| //#define DUMP_STRIKE_CREATION |
| //#define SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER |
| //#define SK_FONTHOST_FREETYPE_RUNTIME_VERSION |
| //#define SK_GAMMA_APPLY_TO_A8 |
| |
| using namespace skia_advanced_typeface_metrics_utils; |
| |
| static bool isLCD(const SkScalerContext::Rec& rec) { |
| return SkMask::kLCD16_Format == rec.fMaskFormat; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| extern "C" { |
| static void* sk_ft_alloc(FT_Memory, long size) { |
| return sk_malloc_throw(size); |
| } |
| static void sk_ft_free(FT_Memory, void* block) { |
| sk_free(block); |
| } |
| static void* sk_ft_realloc(FT_Memory, long cur_size, long new_size, void* block) { |
| return sk_realloc_throw(block, new_size); |
| } |
| }; |
| FT_MemoryRec_ gFTMemory = { nullptr, sk_ft_alloc, sk_ft_free, sk_ft_realloc }; |
| |
| class FreeTypeLibrary : SkNoncopyable { |
| public: |
| FreeTypeLibrary() : fLibrary(nullptr), fIsLCDSupported(false), fLCDExtra(0) { |
| if (FT_New_Library(&gFTMemory, &fLibrary)) { |
| return; |
| } |
| FT_Add_Default_Modules(fLibrary); |
| |
| // Setup LCD filtering. This reduces color fringes for LCD smoothed glyphs. |
| // Default { 0x10, 0x40, 0x70, 0x40, 0x10 } adds up to 0x110, simulating ink spread. |
| // SetLcdFilter must be called before SetLcdFilterWeights. |
| if (FT_Library_SetLcdFilter(fLibrary, FT_LCD_FILTER_DEFAULT) == 0) { |
| fIsLCDSupported = true; |
| fLCDExtra = 2; //Using a filter adds one full pixel to each side. |
| |
| #ifdef SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER |
| // Adds to 0x110 simulating ink spread, but provides better results than default. |
| static unsigned char gGaussianLikeHeavyWeights[] = { 0x1A, 0x43, 0x56, 0x43, 0x1A, }; |
| |
| # if SK_FONTHOST_FREETYPE_RUNTIME_VERSION > 0x020400 |
| FT_Library_SetLcdFilterWeights(fLibrary, gGaussianLikeHeavyWeights); |
| # elif SK_CAN_USE_DLOPEN == 1 |
| //The FreeType library is already loaded, so symbols are available in process. |
| void* self = dlopen(nullptr, RTLD_LAZY); |
| if (self) { |
| FT_Library_SetLcdFilterWeightsProc setLcdFilterWeights; |
| //The following cast is non-standard, but safe for POSIX. |
| *reinterpret_cast<void**>(&setLcdFilterWeights) = |
| dlsym(self, "FT_Library_SetLcdFilterWeights"); |
| dlclose(self); |
| |
| if (setLcdFilterWeights) { |
| setLcdFilterWeights(fLibrary, gGaussianLikeHeavyWeights); |
| } |
| } |
| # endif |
| #endif |
| } |
| } |
| ~FreeTypeLibrary() { |
| if (fLibrary) { |
| FT_Done_Library(fLibrary); |
| } |
| } |
| |
| FT_Library library() { return fLibrary; } |
| bool isLCDSupported() { return fIsLCDSupported; } |
| int lcdExtra() { return fLCDExtra; } |
| |
| private: |
| FT_Library fLibrary; |
| bool fIsLCDSupported; |
| int fLCDExtra; |
| |
| // FT_Library_SetLcdFilterWeights was introduced in FreeType 2.4.0. |
| // The following platforms provide FreeType of at least 2.4.0. |
| // Ubuntu >= 11.04 (previous deprecated April 2013) |
| // Debian >= 6.0 (good) |
| // OpenSuse >= 11.4 (previous deprecated January 2012 / Nov 2013 for Evergreen 11.2) |
| // Fedora >= 14 (good) |
| // Android >= Gingerbread (good) |
| typedef FT_Error (*FT_Library_SetLcdFilterWeightsProc)(FT_Library, unsigned char*); |
| }; |
| |
| struct SkFaceRec; |
| |
| SK_DECLARE_STATIC_MUTEX(gFTMutex); |
| static FreeTypeLibrary* gFTLibrary; |
| static SkFaceRec* gFaceRecHead; |
| |
| // Private to ref_ft_library and unref_ft_library |
| static int gFTCount; |
| |
| // Caller must lock gFTMutex before calling this function. |
| static bool ref_ft_library() { |
| gFTMutex.assertHeld(); |
| SkASSERT(gFTCount >= 0); |
| |
| if (0 == gFTCount) { |
| SkASSERT(nullptr == gFTLibrary); |
| gFTLibrary = new FreeTypeLibrary; |
| } |
| ++gFTCount; |
| return gFTLibrary->library(); |
| } |
| |
| // Caller must lock gFTMutex before calling this function. |
| static void unref_ft_library() { |
| gFTMutex.assertHeld(); |
| SkASSERT(gFTCount > 0); |
| |
| --gFTCount; |
| if (0 == gFTCount) { |
| SkASSERT(nullptr == gFaceRecHead); |
| SkASSERT(nullptr != gFTLibrary); |
| delete gFTLibrary; |
| SkDEBUGCODE(gFTLibrary = nullptr;) |
| } |
| } |
| |
| class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { |
| public: |
| SkScalerContext_FreeType(SkTypeface*, const SkDescriptor* desc); |
| virtual ~SkScalerContext_FreeType(); |
| |
| bool success() const { |
| return fFTSize != nullptr && fFace != nullptr; |
| } |
| |
| protected: |
| unsigned generateGlyphCount() override; |
| uint16_t generateCharToGlyph(SkUnichar uni) override; |
| void generateAdvance(SkGlyph* glyph) override; |
| void generateMetrics(SkGlyph* glyph) override; |
| void generateImage(const SkGlyph& glyph) override; |
| void generatePath(const SkGlyph& glyph, SkPath* path) override; |
| void generateFontMetrics(SkPaint::FontMetrics*) override; |
| SkUnichar generateGlyphToChar(uint16_t glyph) override; |
| |
| private: |
| FT_Face fFace; // reference to shared face in gFaceRecHead |
| FT_Size fFTSize; // our own copy |
| FT_Int fStrikeIndex; |
| FT_F26Dot6 fScaleX, fScaleY; |
| FT_Matrix fMatrix22; |
| uint32_t fLoadGlyphFlags; |
| bool fDoLinearMetrics; |
| bool fLCDIsVert; |
| |
| // Need scalar versions for generateFontMetrics |
| SkVector fScale; |
| SkMatrix fMatrix22Scalar; |
| |
| FT_Error setupSize(); |
| void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, |
| bool snapToPixelBoundary = false); |
| bool getCBoxForLetter(char letter, FT_BBox* bbox); |
| // Caller must lock gFTMutex before calling this function. |
| void updateGlyphIfLCD(SkGlyph* glyph); |
| // Caller must lock gFTMutex before calling this function. |
| // update FreeType2 glyph slot with glyph emboldened |
| void emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////// |
| |
| struct SkFaceRec { |
| SkFaceRec* fNext; |
| FT_Face fFace; |
| FT_StreamRec fFTStream; |
| SkAutoTDelete<SkStreamAsset> fSkStream; |
| uint32_t fRefCnt; |
| uint32_t fFontID; |
| |
| // assumes ownership of the stream, will delete when its done |
| SkFaceRec(SkStreamAsset* strm, uint32_t fontID); |
| }; |
| |
| extern "C" { |
| static unsigned long sk_ft_stream_io(FT_Stream ftStream, |
| unsigned long offset, |
| unsigned char* buffer, |
| unsigned long count) |
| { |
| SkStreamAsset* stream = static_cast<SkStreamAsset*>(ftStream->descriptor.pointer); |
| |
| if (count) { |
| if (!stream->seek(offset)) { |
| return 0; |
| } |
| count = stream->read(buffer, count); |
| } |
| return count; |
| } |
| |
| static void sk_ft_stream_close(FT_Stream) {} |
| } |
| |
| SkFaceRec::SkFaceRec(SkStreamAsset* stream, uint32_t fontID) |
| : fNext(nullptr), fSkStream(stream), fRefCnt(1), fFontID(fontID) |
| { |
| sk_bzero(&fFTStream, sizeof(fFTStream)); |
| fFTStream.size = fSkStream->getLength(); |
| fFTStream.descriptor.pointer = fSkStream; |
| fFTStream.read = sk_ft_stream_io; |
| fFTStream.close = sk_ft_stream_close; |
| } |
| |
| static void ft_face_setup_axes(FT_Face face, const SkFontData& data) { |
| if (!(face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) { |
| return; |
| } |
| |
| SkDEBUGCODE( |
| FT_MM_Var* variations = nullptr; |
| if (FT_Get_MM_Var(face, &variations)) { |
| SkDEBUGF(("INFO: font %s claims variations, but none found.\n", face->family_name)); |
| return; |
| } |
| SkAutoFree autoFreeVariations(variations); |
| |
| if (static_cast<FT_UInt>(data.getAxisCount()) != variations->num_axis) { |
| SkDEBUGF(("INFO: font %s has %d variations, but %d were specified.\n", |
| face->family_name, variations->num_axis, data.getAxisCount())); |
| return; |
| } |
| ) |
| |
| SkAutoSTMalloc<4, FT_Fixed> coords(data.getAxisCount()); |
| for (int i = 0; i < data.getAxisCount(); ++i) { |
| coords[i] = data.getAxis()[i]; |
| } |
| if (FT_Set_Var_Design_Coordinates(face, data.getAxisCount(), coords.get())) { |
| SkDEBUGF(("INFO: font %s has variations, but specified variations could not be set.\n", |
| face->family_name)); |
| return; |
| } |
| } |
| |
| // Will return 0 on failure |
| // Caller must lock gFTMutex before calling this function. |
| static FT_Face ref_ft_face(const SkTypeface* typeface) { |
| gFTMutex.assertHeld(); |
| |
| const SkFontID fontID = typeface->uniqueID(); |
| SkFaceRec* rec = gFaceRecHead; |
| while (rec) { |
| if (rec->fFontID == fontID) { |
| SkASSERT(rec->fFace); |
| rec->fRefCnt += 1; |
| return rec->fFace; |
| } |
| rec = rec->fNext; |
| } |
| |
| SkAutoTDelete<SkFontData> data(typeface->createFontData()); |
| if (nullptr == data || !data->hasStream()) { |
| return nullptr; |
| } |
| |
| // this passes ownership of stream to the rec |
| rec = new SkFaceRec(data->detachStream(), fontID); |
| |
| FT_Open_Args args; |
| memset(&args, 0, sizeof(args)); |
| const void* memoryBase = rec->fSkStream->getMemoryBase(); |
| if (memoryBase) { |
| args.flags = FT_OPEN_MEMORY; |
| args.memory_base = (const FT_Byte*)memoryBase; |
| args.memory_size = rec->fSkStream->getLength(); |
| } else { |
| args.flags = FT_OPEN_STREAM; |
| args.stream = &rec->fFTStream; |
| } |
| |
| FT_Error err = FT_Open_Face(gFTLibrary->library(), &args, data->getIndex(), &rec->fFace); |
| if (err) { |
| SkDEBUGF(("ERROR: unable to open font '%x'\n", fontID)); |
| delete rec; |
| return nullptr; |
| } |
| SkASSERT(rec->fFace); |
| |
| ft_face_setup_axes(rec->fFace, *data); |
| |
| // FreeType will set the charmap to the "most unicode" cmap if it exists. |
| // If there are no unicode cmaps, the charmap is set to nullptr. |
| // However, "symbol" cmaps should also be considered "fallback unicode" cmaps |
| // because they are effectively private use area only (even if they aren't). |
| // This is the last on the fallback list at |
| // https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html |
| if (!rec->fFace->charmap) { |
| FT_Select_Charmap(rec->fFace, FT_ENCODING_MS_SYMBOL); |
| } |
| |
| rec->fNext = gFaceRecHead; |
| gFaceRecHead = rec; |
| return rec->fFace; |
| } |
| |
| // Caller must lock gFTMutex before calling this function. |
| static void unref_ft_face(FT_Face face) { |
| gFTMutex.assertHeld(); |
| |
| SkFaceRec* rec = gFaceRecHead; |
| SkFaceRec* prev = nullptr; |
| while (rec) { |
| SkFaceRec* next = rec->fNext; |
| if (rec->fFace == face) { |
| if (--rec->fRefCnt == 0) { |
| if (prev) { |
| prev->fNext = next; |
| } else { |
| gFaceRecHead = next; |
| } |
| FT_Done_Face(face); |
| delete rec; |
| } |
| return; |
| } |
| prev = rec; |
| rec = next; |
| } |
| SkDEBUGFAIL("shouldn't get here, face not in list"); |
| } |
| |
| class AutoFTAccess { |
| public: |
| AutoFTAccess(const SkTypeface* tf) : fFace(nullptr) { |
| gFTMutex.acquire(); |
| if (!ref_ft_library()) { |
| sk_throw(); |
| } |
| fFace = ref_ft_face(tf); |
| } |
| |
| ~AutoFTAccess() { |
| if (fFace) { |
| unref_ft_face(fFace); |
| } |
| unref_ft_library(); |
| gFTMutex.release(); |
| } |
| |
| FT_Face face() { return fFace; } |
| |
| private: |
| FT_Face fFace; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| static bool canEmbed(FT_Face face) { |
| FT_UShort fsType = FT_Get_FSType_Flags(face); |
| return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | |
| FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; |
| } |
| |
| static bool canSubset(FT_Face face) { |
| FT_UShort fsType = FT_Get_FSType_Flags(face); |
| return (fsType & FT_FSTYPE_NO_SUBSETTING) == 0; |
| } |
| |
| static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { |
| const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); |
| if (!glyph_id) |
| return false; |
| if (FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE) != 0) |
| return false; |
| FT_Outline_Get_CBox(&face->glyph->outline, bbox); |
| return true; |
| } |
| |
| static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { |
| FT_Fixed advance = 0; |
| if (FT_Get_Advances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { |
| return false; |
| } |
| SkASSERT(data); |
| *data = advance; |
| return true; |
| } |
| |
| static void populate_glyph_to_unicode(FT_Face& face, SkTDArray<SkUnichar>* glyphToUnicode) { |
| glyphToUnicode->setCount(face->num_glyphs); |
| sk_bzero(glyphToUnicode->begin(), sizeof((*glyphToUnicode)[0]) * face->num_glyphs); |
| |
| FT_UInt glyphIndex; |
| SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); |
| while (glyphIndex) { |
| (*glyphToUnicode)[glyphIndex] = charCode; |
| charCode = FT_Get_Next_Char(face, charCode, &glyphIndex); |
| } |
| } |
| |
| SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics( |
| PerGlyphInfo perGlyphInfo, |
| const uint32_t* glyphIDs, |
| uint32_t glyphIDsCount) const { |
| #if defined(SK_BUILD_FOR_MAC) |
| return nullptr; |
| #else |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return nullptr; |
| } |
| |
| SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; |
| info->fFontName.set(FT_Get_Postscript_Name(face)); |
| info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag; |
| if (FT_HAS_MULTIPLE_MASTERS(face)) { |
| info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( |
| info->fFlags, SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag); |
| } |
| if (!canEmbed(face)) { |
| info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( |
| info->fFlags, |
| SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag); |
| } |
| if (!canSubset(face)) { |
| info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( |
| info->fFlags, |
| SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag); |
| } |
| info->fLastGlyphID = face->num_glyphs - 1; |
| info->fEmSize = 1000; |
| |
| bool cid = false; |
| const char* fontType = FT_Get_X11_Font_Format(face); |
| if (strcmp(fontType, "Type 1") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kType1_Font; |
| } else if (strcmp(fontType, "CID Type 1") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; |
| cid = true; |
| } else if (strcmp(fontType, "CFF") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; |
| } else if (strcmp(fontType, "TrueType") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
| cid = true; |
| TT_Header* ttHeader; |
| if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, |
| ft_sfnt_head)) != nullptr) { |
| info->fEmSize = ttHeader->Units_Per_EM; |
| } |
| } else { |
| info->fType = SkAdvancedTypefaceMetrics::kOther_Font; |
| } |
| |
| info->fStyle = 0; |
| if (FT_IS_FIXED_WIDTH(face)) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
| if (face->style_flags & FT_STYLE_FLAG_ITALIC) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
| |
| PS_FontInfoRec ps_info; |
| TT_Postscript* tt_info; |
| if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { |
| info->fItalicAngle = ps_info.italic_angle; |
| } else if ((tt_info = |
| (TT_Postscript*)FT_Get_Sfnt_Table(face, |
| ft_sfnt_post)) != nullptr) { |
| info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); |
| } else { |
| info->fItalicAngle = 0; |
| } |
| |
| info->fAscent = face->ascender; |
| info->fDescent = face->descender; |
| |
| // Figure out a good guess for StemV - Min width of i, I, !, 1. |
| // This probably isn't very good with an italic font. |
| int16_t min_width = SHRT_MAX; |
| info->fStemV = 0; |
| char stem_chars[] = {'i', 'I', '!', '1'}; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| FT_BBox bbox; |
| if (GetLetterCBox(face, stem_chars[i], &bbox)) { |
| int16_t width = bbox.xMax - bbox.xMin; |
| if (width > 0 && width < min_width) { |
| min_width = width; |
| info->fStemV = min_width; |
| } |
| } |
| } |
| |
| TT_PCLT* pclt_info; |
| TT_OS2* os2_table; |
| if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != nullptr) { |
| info->fCapHeight = pclt_info->CapHeight; |
| uint8_t serif_style = pclt_info->SerifStyle & 0x3F; |
| if (serif_style >= 2 && serif_style <= 6) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
| else if (serif_style >= 9 && serif_style <= 12) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
| } else if (((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != nullptr) && |
| // sCapHeight is available only when version 2 or later. |
| os2_table->version != 0xFFFF && |
| os2_table->version >= 2) { |
| info->fCapHeight = os2_table->sCapHeight; |
| } else { |
| // Figure out a good guess for CapHeight: average the height of M and X. |
| FT_BBox m_bbox, x_bbox; |
| bool got_m, got_x; |
| got_m = GetLetterCBox(face, 'M', &m_bbox); |
| got_x = GetLetterCBox(face, 'X', &x_bbox); |
| if (got_m && got_x) { |
| info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - |
| x_bbox.yMin) / 2; |
| } else if (got_m && !got_x) { |
| info->fCapHeight = m_bbox.yMax - m_bbox.yMin; |
| } else if (!got_m && got_x) { |
| info->fCapHeight = x_bbox.yMax - x_bbox.yMin; |
| } else { |
| // Last resort, use the ascent. |
| info->fCapHeight = info->fAscent; |
| } |
| } |
| |
| info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| face->bbox.xMax, face->bbox.yMin); |
| |
| if (!FT_IS_SCALABLE(face)) { |
| perGlyphInfo = kNo_PerGlyphInfo; |
| } |
| |
| if (perGlyphInfo & kHAdvance_PerGlyphInfo) { |
| if (FT_IS_FIXED_WIDTH(face)) { |
| appendRange(&info->fGlyphWidths, 0); |
| int16_t advance = face->max_advance_width; |
| info->fGlyphWidths->fAdvance.append(1, &advance); |
| finishRange(info->fGlyphWidths.get(), 0, |
| SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
| } else if (!cid) { |
| appendRange(&info->fGlyphWidths, 0); |
| // So as to not blow out the stack, get advances in batches. |
| for (int gID = 0; gID < face->num_glyphs; gID += 128) { |
| FT_Fixed advances[128]; |
| int advanceCount = 128; |
| if (gID + advanceCount > face->num_glyphs) { |
| advanceCount = face->num_glyphs - gID; |
| } |
| FT_Get_Advances(face, gID, advanceCount, FT_LOAD_NO_SCALE, advances); |
| for (int i = 0; i < advanceCount; i++) { |
| int16_t advance = advances[i]; |
| info->fGlyphWidths->fAdvance.append(1, &advance); |
| } |
| } |
| finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, |
| SkAdvancedTypefaceMetrics::WidthRange::kRange); |
| } else { |
| info->fGlyphWidths.reset( |
| getAdvanceData(face, |
| face->num_glyphs, |
| glyphIDs, |
| glyphIDsCount, |
| &getWidthAdvance)); |
| } |
| } |
| |
| if (perGlyphInfo & kVAdvance_PerGlyphInfo && |
| FT_HAS_VERTICAL(face)) { |
| SkASSERT(false); // Not implemented yet. |
| } |
| |
| if (perGlyphInfo & kGlyphNames_PerGlyphInfo && |
| info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { |
| // Postscript fonts may contain more than 255 glyphs, so we end up |
| // using multiple font descriptions with a glyph ordering. Record |
| // the name of each glyph. |
| info->fGlyphNames.reset( |
| new SkAutoTArray<SkString>(face->num_glyphs)); |
| for (int gID = 0; gID < face->num_glyphs; gID++) { |
| char glyphName[128]; // PS limit for names is 127 bytes. |
| FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| info->fGlyphNames->get()[gID].set(glyphName); |
| } |
| } |
| |
| if (perGlyphInfo & kToUnicode_PerGlyphInfo && |
| info->fType != SkAdvancedTypefaceMetrics::kType1_Font && |
| face->num_charmaps) { |
| populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); |
| } |
| |
| return info; |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| static bool bothZero(SkScalar a, SkScalar b) { |
| return 0 == a && 0 == b; |
| } |
| |
| // returns false if there is any non-90-rotation or skew |
| static bool isAxisAligned(const SkScalerContext::Rec& rec) { |
| return 0 == rec.fPreSkewX && |
| (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || |
| bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); |
| } |
| |
| SkScalerContext* SkTypeface_FreeType::onCreateScalerContext( |
| const SkDescriptor* desc) const { |
| SkScalerContext_FreeType* c = |
| new SkScalerContext_FreeType(const_cast<SkTypeface_FreeType*>(this), desc); |
| if (!c->success()) { |
| delete c; |
| c = nullptr; |
| } |
| return c; |
| } |
| |
| void SkTypeface_FreeType::onFilterRec(SkScalerContextRec* rec) const { |
| //BOGUS: http://code.google.com/p/chromium/issues/detail?id=121119 |
| //Cap the requested size as larger sizes give bogus values. |
| //Remove when http://code.google.com/p/skia/issues/detail?id=554 is fixed. |
| //Note that this also currently only protects against large text size requests, |
| //the total matrix is not taken into account here. |
| if (rec->fTextSize > SkIntToScalar(1 << 14)) { |
| rec->fTextSize = SkIntToScalar(1 << 14); |
| } |
| |
| if (isLCD(*rec)) { |
| // TODO: re-work so that FreeType is set-up and selected by the SkFontMgr. |
| SkAutoMutexAcquire ama(gFTMutex); |
| ref_ft_library(); |
| if (!gFTLibrary->isLCDSupported()) { |
| // If the runtime Freetype library doesn't support LCD, disable it here. |
| rec->fMaskFormat = SkMask::kA8_Format; |
| } |
| unref_ft_library(); |
| } |
| |
| SkPaint::Hinting h = rec->getHinting(); |
| if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { |
| // collapse full->normal hinting if we're not doing LCD |
| h = SkPaint::kNormal_Hinting; |
| } |
| if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag)) { |
| if (SkPaint::kNo_Hinting != h) { |
| h = SkPaint::kSlight_Hinting; |
| } |
| } |
| |
| // rotated text looks bad with hinting, so we disable it as needed |
| if (!isAxisAligned(*rec)) { |
| h = SkPaint::kNo_Hinting; |
| } |
| rec->setHinting(h); |
| |
| #ifndef SK_GAMMA_APPLY_TO_A8 |
| if (!isLCD(*rec)) { |
| rec->ignorePreBlend(); |
| } |
| #endif |
| } |
| |
| int SkTypeface_FreeType::onGetUPEM() const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| return face ? face->units_per_EM : 0; |
| } |
| |
| bool SkTypeface_FreeType::onGetKerningPairAdjustments(const uint16_t glyphs[], |
| int count, int32_t adjustments[]) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face || !FT_HAS_KERNING(face)) { |
| return false; |
| } |
| |
| for (int i = 0; i < count - 1; ++i) { |
| FT_Vector delta; |
| FT_Error err = FT_Get_Kerning(face, glyphs[i], glyphs[i+1], |
| FT_KERNING_UNSCALED, &delta); |
| if (err) { |
| return false; |
| } |
| adjustments[i] = delta.x; |
| } |
| return true; |
| } |
| |
| static FT_Int chooseBitmapStrike(FT_Face face, FT_F26Dot6 scaleY) { |
| // early out if face is bad |
| if (face == nullptr) { |
| SkDEBUGF(("chooseBitmapStrike aborted due to nullptr face\n")); |
| return -1; |
| } |
| // determine target ppem |
| FT_Pos targetPPEM = scaleY; |
| // find a bitmap strike equal to or just larger than the requested size |
| FT_Int chosenStrikeIndex = -1; |
| FT_Pos chosenPPEM = 0; |
| for (FT_Int strikeIndex = 0; strikeIndex < face->num_fixed_sizes; ++strikeIndex) { |
| FT_Pos thisPPEM = face->available_sizes[strikeIndex].y_ppem; |
| if (thisPPEM == targetPPEM) { |
| // exact match - our search stops here |
| chosenPPEM = thisPPEM; |
| chosenStrikeIndex = strikeIndex; |
| break; |
| } else if (chosenPPEM < targetPPEM) { |
| // attempt to increase chosenPPEM |
| if (thisPPEM > chosenPPEM) { |
| chosenPPEM = thisPPEM; |
| chosenStrikeIndex = strikeIndex; |
| } |
| } else { |
| // attempt to decrease chosenPPEM, but not below targetPPEM |
| if (thisPPEM < chosenPPEM && thisPPEM > targetPPEM) { |
| chosenPPEM = thisPPEM; |
| chosenStrikeIndex = strikeIndex; |
| } |
| } |
| } |
| if (chosenStrikeIndex != -1) { |
| // use the chosen strike |
| FT_Error err = FT_Select_Size(face, chosenStrikeIndex); |
| if (err != 0) { |
| SkDEBUGF(("FT_Select_Size(%s, %d) returned 0x%x\n", face->family_name, |
| chosenStrikeIndex, err)); |
| chosenStrikeIndex = -1; |
| } |
| } |
| return chosenStrikeIndex; |
| } |
| |
| SkScalerContext_FreeType::SkScalerContext_FreeType(SkTypeface* typeface, const SkDescriptor* desc) |
| : SkScalerContext_FreeType_Base(typeface, desc) |
| , fFace(nullptr) |
| , fFTSize(nullptr) |
| , fStrikeIndex(-1) |
| { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (!ref_ft_library()) { |
| sk_throw(); |
| } |
| |
| // load the font file |
| using UnrefFTFace = SkFunctionWrapper<void, skstd::remove_pointer_t<FT_Face>, unref_ft_face>; |
| skstd::unique_ptr<skstd::remove_pointer_t<FT_Face>, UnrefFTFace> ftFace(ref_ft_face(typeface)); |
| if (nullptr == ftFace) { |
| SkDEBUGF(("Could not create FT_Face.\n")); |
| return; |
| } |
| |
| fRec.computeMatrices(SkScalerContextRec::kFull_PreMatrixScale, &fScale, &fMatrix22Scalar); |
| fMatrix22Scalar.setSkewX(-fMatrix22Scalar.getSkewX()); |
| fMatrix22Scalar.setSkewY(-fMatrix22Scalar.getSkewY()); |
| |
| fScaleX = SkScalarToFDot6(fScale.fX); |
| fScaleY = SkScalarToFDot6(fScale.fY); |
| fMatrix22.xx = SkScalarToFixed(fMatrix22Scalar.getScaleX()); |
| fMatrix22.xy = SkScalarToFixed(fMatrix22Scalar.getSkewX()); |
| fMatrix22.yx = SkScalarToFixed(fMatrix22Scalar.getSkewY()); |
| fMatrix22.yy = SkScalarToFixed(fMatrix22Scalar.getScaleY()); |
| |
| fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); |
| |
| // compute the flags we send to Load_Glyph |
| bool linearMetrics = SkToBool(fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag); |
| { |
| FT_Int32 loadFlags = FT_LOAD_DEFAULT; |
| |
| if (SkMask::kBW_Format == fRec.fMaskFormat) { |
| // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 |
| loadFlags = FT_LOAD_TARGET_MONO; |
| if (fRec.getHinting() == SkPaint::kNo_Hinting) { |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| } |
| } else { |
| switch (fRec.getHinting()) { |
| case SkPaint::kNo_Hinting: |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| break; |
| case SkPaint::kSlight_Hinting: |
| loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| break; |
| case SkPaint::kNormal_Hinting: |
| if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { |
| loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| } else { |
| loadFlags = FT_LOAD_NO_AUTOHINT; |
| #endif |
| } |
| break; |
| case SkPaint::kFull_Hinting: |
| if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { |
| loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| break; |
| } |
| loadFlags = FT_LOAD_TARGET_NORMAL; |
| if (isLCD(fRec)) { |
| if (fLCDIsVert) { |
| loadFlags = FT_LOAD_TARGET_LCD_V; |
| } else { |
| loadFlags = FT_LOAD_TARGET_LCD; |
| } |
| } |
| break; |
| default: |
| SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| break; |
| } |
| } |
| |
| if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { |
| loadFlags |= FT_LOAD_NO_BITMAP; |
| } |
| |
| // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct |
| // advances, as fontconfig and cairo do. |
| // See http://code.google.com/p/skia/issues/detail?id=222. |
| loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; |
| |
| // Use vertical layout if requested. |
| if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| loadFlags |= FT_LOAD_VERTICAL_LAYOUT; |
| } |
| |
| loadFlags |= FT_LOAD_COLOR; |
| |
| fLoadGlyphFlags = loadFlags; |
| } |
| |
| using DoneFTSize = SkFunctionWrapper<FT_Error, skstd::remove_pointer_t<FT_Size>, FT_Done_Size>; |
| skstd::unique_ptr<skstd::remove_pointer_t<FT_Size>, DoneFTSize> ftSize([&ftFace]() -> FT_Size { |
| FT_Size size; |
| FT_Error err = FT_New_Size(ftFace.get(), &size); |
| if (err != 0) { |
| SkDEBUGF(("FT_New_Size returned %x for face %s\n", err, ftFace->family_name)); |
| return nullptr; |
| } |
| return size; |
| }()); |
| if (nullptr == ftSize) { |
| SkDEBUGF(("Could not create FT_Size.\n")); |
| return; |
| } |
| |
| FT_Error err = FT_Activate_Size(ftSize.get()); |
| if (err != 0) { |
| SkDEBUGF(("FT_Activate_Size(%08x, 0x%x, 0x%x) returned 0x%x\n", |
| ftFace.get(), fScaleX, fScaleY, err)); |
| return; |
| } |
| |
| if (FT_IS_SCALABLE(ftFace)) { |
| err = FT_Set_Char_Size(ftFace.get(), fScaleX, fScaleY, 72, 72); |
| if (err != 0) { |
| SkDEBUGF(("FT_Set_CharSize(%08x, 0x%x, 0x%x) returned 0x%x\n", |
| ftFace.get(), fScaleX, fScaleY, err)); |
| return; |
| } |
| FT_Set_Transform(ftFace.get(), &fMatrix22, nullptr); |
| } else if (FT_HAS_FIXED_SIZES(ftFace)) { |
| fStrikeIndex = chooseBitmapStrike(ftFace.get(), fScaleY); |
| if (fStrikeIndex == -1) { |
| SkDEBUGF(("no glyphs for font \"%s\" size %f?\n", |
| ftFace->family_name, SkFDot6ToScalar(fScaleY))); |
| } else { |
| // FreeType does no provide linear metrics for bitmap fonts. |
| linearMetrics = false; |
| |
| // FreeType documentation says: |
| // FT_LOAD_NO_BITMAP -- Ignore bitmap strikes when loading. |
| // Bitmap-only fonts ignore this flag. |
| // |
| // However, in FreeType 2.5.1 color bitmap only fonts do not ignore this flag. |
| // Force this flag off for bitmap only fonts. |
| fLoadGlyphFlags &= ~FT_LOAD_NO_BITMAP; |
| } |
| } else { |
| SkDEBUGF(("unknown kind of font \"%s\" size %f?\n", |
| fFace->family_name, SkFDot6ToScalar(fScaleY))); |
| } |
| |
| fFTSize = ftSize.release(); |
| fFace = ftFace.release(); |
| fDoLinearMetrics = linearMetrics; |
| } |
| |
| SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (fFTSize != nullptr) { |
| FT_Done_Size(fFTSize); |
| } |
| |
| if (fFace != nullptr) { |
| unref_ft_face(fFace); |
| } |
| |
| unref_ft_library(); |
| } |
| |
| /* We call this before each use of the fFace, since we may be sharing |
| this face with other context (at different sizes). |
| */ |
| FT_Error SkScalerContext_FreeType::setupSize() { |
| gFTMutex.assertHeld(); |
| FT_Error err = FT_Activate_Size(fFTSize); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%s %s, 0x%x, 0x%x) returned 0x%x\n", |
| fFace->family_name, fFace->style_name, fScaleX, fScaleY, err)); |
| fFTSize = nullptr; |
| return err; |
| } |
| |
| // seems we need to reset this every time (not sure why, but without it |
| // I get random italics from some other fFTSize) |
| FT_Set_Transform(fFace, &fMatrix22, nullptr); |
| return 0; |
| } |
| |
| unsigned SkScalerContext_FreeType::generateGlyphCount() { |
| return fFace->num_glyphs; |
| } |
| |
| uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| return SkToU16(FT_Get_Char_Index( fFace, uni )); |
| } |
| |
| SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| // iterate through each cmap entry, looking for matching glyph indices |
| FT_UInt glyphIndex; |
| SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); |
| |
| while (glyphIndex != 0) { |
| if (glyphIndex == glyph) { |
| return charCode; |
| } |
| charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); |
| } |
| |
| return 0; |
| } |
| |
| void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { |
| /* unhinted and light hinted text have linearly scaled advances |
| * which are very cheap to compute with some font formats... |
| */ |
| if (fDoLinearMetrics) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (this->setupSize()) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| FT_Error error; |
| FT_Fixed advance; |
| |
| error = FT_Get_Advance( fFace, glyph->getGlyphID(), |
| fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| &advance ); |
| if (0 == error) { |
| glyph->fRsbDelta = 0; |
| glyph->fLsbDelta = 0; |
| glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); |
| glyph->fAdvanceY = - SkFixedMul(fMatrix22.yx, advance); |
| return; |
| } |
| } |
| |
| /* otherwise, we need to load/hint the glyph, which is slower */ |
| this->generateMetrics(glyph); |
| return; |
| } |
| |
| void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, |
| FT_BBox* bbox, |
| bool snapToPixelBoundary) { |
| |
| FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| |
| if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
| int dx = SkFixedToFDot6(glyph->getSubXFixed()); |
| int dy = SkFixedToFDot6(glyph->getSubYFixed()); |
| // negate dy since freetype-y-goes-up and skia-y-goes-down |
| bbox->xMin += dx; |
| bbox->yMin -= dy; |
| bbox->xMax += dx; |
| bbox->yMax -= dy; |
| } |
| |
| // outset the box to integral boundaries |
| if (snapToPixelBoundary) { |
| bbox->xMin &= ~63; |
| bbox->yMin &= ~63; |
| bbox->xMax = (bbox->xMax + 63) & ~63; |
| bbox->yMax = (bbox->yMax + 63) & ~63; |
| } |
| |
| // Must come after snapToPixelBoundary so that the width and height are |
| // consistent. Otherwise asserts will fire later on when generating the |
| // glyph image. |
| if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| bbox->xMin += vector.x; |
| bbox->xMax += vector.x; |
| bbox->yMin += vector.y; |
| bbox->yMax += vector.y; |
| } |
| } |
| |
| bool SkScalerContext_FreeType::getCBoxForLetter(char letter, FT_BBox* bbox) { |
| const FT_UInt glyph_id = FT_Get_Char_Index(fFace, letter); |
| if (!glyph_id) { |
| return false; |
| } |
| if (FT_Load_Glyph(fFace, glyph_id, fLoadGlyphFlags) != 0) { |
| return false; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph); |
| FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| return true; |
| } |
| |
| void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { |
| if (isLCD(fRec)) { |
| if (fLCDIsVert) { |
| glyph->fHeight += gFTLibrary->lcdExtra(); |
| glyph->fTop -= gFTLibrary->lcdExtra() >> 1; |
| } else { |
| glyph->fWidth += gFTLibrary->lcdExtra(); |
| glyph->fLeft -= gFTLibrary->lcdExtra() >> 1; |
| } |
| } |
| } |
| |
| inline void scaleGlyphMetrics(SkGlyph& glyph, SkScalar scale) { |
| glyph.fWidth *= scale; |
| glyph.fHeight *= scale; |
| glyph.fTop *= scale; |
| glyph.fLeft *= scale; |
| |
| SkFixed fixedScale = SkScalarToFixed(scale); |
| glyph.fAdvanceX = SkFixedMul(glyph.fAdvanceX, fixedScale); |
| glyph.fAdvanceY = SkFixedMul(glyph.fAdvanceY, fixedScale); |
| } |
| |
| void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| glyph->fRsbDelta = 0; |
| glyph->fLsbDelta = 0; |
| |
| FT_Error err; |
| |
| if (this->setupSize()) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| err = FT_Load_Glyph( fFace, glyph->getGlyphID(), fLoadGlyphFlags ); |
| if (err != 0) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph); |
| |
| switch ( fFace->glyph->format ) { |
| case FT_GLYPH_FORMAT_OUTLINE: |
| if (0 == fFace->glyph->outline.n_contours) { |
| glyph->fWidth = 0; |
| glyph->fHeight = 0; |
| glyph->fTop = 0; |
| glyph->fLeft = 0; |
| } else { |
| FT_BBox bbox; |
| getBBoxForCurrentGlyph(glyph, &bbox, true); |
| |
| glyph->fWidth = SkToU16(SkFDot6Floor(bbox.xMax - bbox.xMin)); |
| glyph->fHeight = SkToU16(SkFDot6Floor(bbox.yMax - bbox.yMin)); |
| glyph->fTop = -SkToS16(SkFDot6Floor(bbox.yMax)); |
| glyph->fLeft = SkToS16(SkFDot6Floor(bbox.xMin)); |
| |
| updateGlyphIfLCD(glyph); |
| } |
| break; |
| |
| case FT_GLYPH_FORMAT_BITMAP: |
| if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); |
| fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); |
| } |
| |
| if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) { |
| glyph->fMaskFormat = SkMask::kARGB32_Format; |
| } |
| |
| glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); |
| glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); |
| glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); |
| glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); |
| break; |
| |
| default: |
| SkDEBUGFAIL("unknown glyph format"); |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| if (fDoLinearMetrics) { |
| glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); |
| glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); |
| } else { |
| glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); |
| glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); |
| } |
| } else { |
| if (fDoLinearMetrics) { |
| glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); |
| glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); |
| } else { |
| glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); |
| glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); |
| |
| if (fRec.fFlags & kDevKernText_Flag) { |
| glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); |
| glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); |
| } |
| } |
| } |
| |
| // If the font isn't scalable, scale the metrics from the non-scalable strike. |
| // This means do not try to scale embedded bitmaps; only scale bitmaps in bitmap only fonts. |
| if (!FT_IS_SCALABLE(fFace) && !SkScalarNearlyZero(fScale.fY) && fFace->size->metrics.y_ppem) { |
| // NOTE: both dimensions are scaled by y_ppem. this is WAI. |
| scaleGlyphMetrics(*glyph, fScale.fY / fFace->size->metrics.y_ppem); |
| } |
| |
| #ifdef ENABLE_GLYPH_SPEW |
| SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); |
| SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(), fLoadGlyphFlags, glyph->fWidth)); |
| #endif |
| } |
| |
| static void clear_glyph_image(const SkGlyph& glyph) { |
| sk_bzero(glyph.fImage, glyph.rowBytes() * glyph.fHeight); |
| } |
| |
| void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (this->setupSize()) { |
| clear_glyph_image(glyph); |
| return; |
| } |
| |
| FT_Error err = FT_Load_Glyph(fFace, glyph.getGlyphID(), fLoadGlyphFlags); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", |
| glyph.getGlyphID(), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); |
| clear_glyph_image(glyph); |
| return; |
| } |
| |
| emboldenIfNeeded(fFace, fFace->glyph); |
| generateGlyphImage(fFace, glyph); |
| } |
| |
| |
| void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, SkPath* path) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| SkASSERT(path); |
| |
| if (this->setupSize()) { |
| path->reset(); |
| return; |
| } |
| |
| uint32_t flags = fLoadGlyphFlags; |
| flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| |
| FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(), flags); |
| |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| glyph.getGlyphID(), flags, err)); |
| path->reset(); |
| return; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph); |
| |
| generateGlyphPath(fFace, path); |
| |
| // The path's origin from FreeType is always the horizontal layout origin. |
| // Offset the path so that it is relative to the vertical origin if needed. |
| if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| path->offset(SkFDot6ToScalar(vector.x), -SkFDot6ToScalar(vector.y)); |
| } |
| } |
| |
| void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* metrics) { |
| if (nullptr == metrics) { |
| return; |
| } |
| |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (this->setupSize()) { |
| ERROR: |
| sk_bzero(metrics, sizeof(*metrics)); |
| return; |
| } |
| |
| FT_Face face = fFace; |
| SkScalar scaleX = fScale.x(); |
| SkScalar scaleY = fScale.y(); |
| SkScalar mxy = fMatrix22Scalar.getSkewX() * scaleY; |
| SkScalar myy = fMatrix22Scalar.getScaleY() * scaleY; |
| |
| // fetch units/EM from "head" table if needed (ie for bitmap fonts) |
| SkScalar upem = SkIntToScalar(face->units_per_EM); |
| if (!upem) { |
| TT_Header* ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, ft_sfnt_head); |
| if (ttHeader) { |
| upem = SkIntToScalar(ttHeader->Units_Per_EM); |
| } |
| } |
| |
| // use the os/2 table as a source of reasonable defaults. |
| SkScalar x_height = 0.0f; |
| SkScalar avgCharWidth = 0.0f; |
| SkScalar cap_height = 0.0f; |
| TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| if (os2) { |
| x_height = scaleX * SkIntToScalar(os2->sxHeight) / upem; |
| avgCharWidth = SkIntToScalar(os2->xAvgCharWidth) / upem; |
| if (os2->version != 0xFFFF && os2->version >= 2) { |
| cap_height = scaleX * SkIntToScalar(os2->sCapHeight) / upem; |
| } |
| } |
| |
| // pull from format-specific metrics as needed |
| SkScalar ascent, descent, leading, xmin, xmax, ymin, ymax; |
| SkScalar underlineThickness, underlinePosition; |
| if (face->face_flags & FT_FACE_FLAG_SCALABLE) { // scalable outline font |
| // FreeType will always use HHEA metrics if they're not zero. |
| // It completely ignores the OS/2 fsSelection::UseTypoMetrics bit. |
| // It also ignores the VDMX tables, which are also of interest here |
| // (and override everything else when they apply). |
| static const int kUseTypoMetricsMask = (1 << 7); |
| if (os2 && os2->version != 0xFFFF && (os2->fsSelection & kUseTypoMetricsMask)) { |
| ascent = -SkIntToScalar(os2->sTypoAscender) / upem; |
| descent = -SkIntToScalar(os2->sTypoDescender) / upem; |
| leading = SkIntToScalar(os2->sTypoLineGap) / upem; |
| } else { |
| ascent = -SkIntToScalar(face->ascender) / upem; |
| descent = -SkIntToScalar(face->descender) / upem; |
| leading = SkIntToScalar(face->height + (face->descender - face->ascender)) / upem; |
| } |
| xmin = SkIntToScalar(face->bbox.xMin) / upem; |
| xmax = SkIntToScalar(face->bbox.xMax) / upem; |
| ymin = -SkIntToScalar(face->bbox.yMin) / upem; |
| ymax = -SkIntToScalar(face->bbox.yMax) / upem; |
| underlineThickness = SkIntToScalar(face->underline_thickness) / upem; |
| underlinePosition = -SkIntToScalar(face->underline_position + |
| face->underline_thickness / 2) / upem; |
| |
| metrics->fFlags |= SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag; |
| metrics->fFlags |= SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag; |
| |
| // we may be able to synthesize x_height and cap_height from outline |
| if (!x_height) { |
| FT_BBox bbox; |
| if (getCBoxForLetter('x', &bbox)) { |
| x_height = SkIntToScalar(bbox.yMax) / 64.0f; |
| } |
| } |
| if (!cap_height) { |
| FT_BBox bbox; |
| if (getCBoxForLetter('H', &bbox)) { |
| cap_height = SkIntToScalar(bbox.yMax) / 64.0f; |
| } |
| } |
| } else if (fStrikeIndex != -1) { // bitmap strike metrics |
| SkScalar xppem = SkIntToScalar(face->size->metrics.x_ppem); |
| SkScalar yppem = SkIntToScalar(face->size->metrics.y_ppem); |
| ascent = -SkIntToScalar(face->size->metrics.ascender) / (yppem * 64.0f); |
| descent = -SkIntToScalar(face->size->metrics.descender) / (yppem * 64.0f); |
| leading = (SkIntToScalar(face->size->metrics.height) / (yppem * 64.0f)) |
| + ascent - descent; |
| xmin = 0.0f; |
| xmax = SkIntToScalar(face->available_sizes[fStrikeIndex].width) / xppem; |
| ymin = descent + leading; |
| ymax = ascent - descent; |
| underlineThickness = 0; |
| underlinePosition = 0; |
| |
| metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag; |
| metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag; |
| } else { |
| goto ERROR; |
| } |
| |
| // synthesize elements that were not provided by the os/2 table or format-specific metrics |
| if (!x_height) { |
| x_height = -ascent; |
| } |
| if (!avgCharWidth) { |
| avgCharWidth = xmax - xmin; |
| } |
| if (!cap_height) { |
| cap_height = -ascent; |
| } |
| |
| // disallow negative linespacing |
| if (leading < 0.0f) { |
| leading = 0.0f; |
| } |
| |
| SkScalar scale = myy; |
| if (this->isVertical()) { |
| scale = mxy; |
| } |
| metrics->fTop = ymax * scale; |
| metrics->fAscent = ascent * scale; |
| metrics->fDescent = descent * scale; |
| metrics->fBottom = ymin * scale; |
| metrics->fLeading = leading * scale; |
| metrics->fAvgCharWidth = avgCharWidth * scale; |
| metrics->fXMin = xmin * scale; |
| metrics->fXMax = xmax * scale; |
| metrics->fXHeight = x_height; |
| metrics->fCapHeight = cap_height; |
| metrics->fUnderlineThickness = underlineThickness * scale; |
| metrics->fUnderlinePosition = underlinePosition * scale; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // hand-tuned value to reduce outline embolden strength |
| #ifndef SK_OUTLINE_EMBOLDEN_DIVISOR |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| #define SK_OUTLINE_EMBOLDEN_DIVISOR 34 |
| #else |
| #define SK_OUTLINE_EMBOLDEN_DIVISOR 24 |
| #endif |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkScalerContext_FreeType::emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph) |
| { |
| // check to see if the embolden bit is set |
| if (0 == (fRec.fFlags & SkScalerContext::kEmbolden_Flag)) { |
| return; |
| } |
| |
| switch (glyph->format) { |
| case FT_GLYPH_FORMAT_OUTLINE: |
| FT_Pos strength; |
| strength = FT_MulFix(face->units_per_EM, face->size->metrics.y_scale) |
| / SK_OUTLINE_EMBOLDEN_DIVISOR; |
| FT_Outline_Embolden(&glyph->outline, strength); |
| break; |
| case FT_GLYPH_FORMAT_BITMAP: |
| FT_GlyphSlot_Own_Bitmap(glyph); |
| FT_Bitmap_Embolden(glyph->library, &glyph->bitmap, kBitmapEmboldenStrength, 0); |
| break; |
| default: |
| SkDEBUGFAIL("unknown glyph format"); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkUtils.h" |
| |
| static SkUnichar next_utf8(const void** chars) { |
| return SkUTF8_NextUnichar((const char**)chars); |
| } |
| |
| static SkUnichar next_utf16(const void** chars) { |
| return SkUTF16_NextUnichar((const uint16_t**)chars); |
| } |
| |
| static SkUnichar next_utf32(const void** chars) { |
| const SkUnichar** uniChars = (const SkUnichar**)chars; |
| SkUnichar uni = **uniChars; |
| *uniChars += 1; |
| return uni; |
| } |
| |
| typedef SkUnichar (*EncodingProc)(const void**); |
| |
| static EncodingProc find_encoding_proc(SkTypeface::Encoding enc) { |
| static const EncodingProc gProcs[] = { |
| next_utf8, next_utf16, next_utf32 |
| }; |
| SkASSERT((size_t)enc < SK_ARRAY_COUNT(gProcs)); |
| return gProcs[enc]; |
| } |
| |
| int SkTypeface_FreeType::onCharsToGlyphs(const void* chars, Encoding encoding, |
| uint16_t glyphs[], int glyphCount) const |
| { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| if (glyphs) { |
| sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); |
| } |
| return 0; |
| } |
| |
| EncodingProc next_uni_proc = find_encoding_proc(encoding); |
| |
| if (nullptr == glyphs) { |
| for (int i = 0; i < glyphCount; ++i) { |
| if (0 == FT_Get_Char_Index(face, next_uni_proc(&chars))) { |
| return i; |
| } |
| } |
| return glyphCount; |
| } else { |
| int first = glyphCount; |
| for (int i = 0; i < glyphCount; ++i) { |
| unsigned id = FT_Get_Char_Index(face, next_uni_proc(&chars)); |
| glyphs[i] = SkToU16(id); |
| if (0 == id && i < first) { |
| first = i; |
| } |
| } |
| return first; |
| } |
| } |
| |
| int SkTypeface_FreeType::onCountGlyphs() const { |
| // we cache this value, using -1 as a sentinel for "not computed" |
| if (fGlyphCount < 0) { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| // if the face failed, we still assign a non-negative value |
| fGlyphCount = face ? face->num_glyphs : 0; |
| } |
| return fGlyphCount; |
| } |
| |
| SkTypeface::LocalizedStrings* SkTypeface_FreeType::onCreateFamilyNameIterator() const { |
| SkTypeface::LocalizedStrings* nameIter = |
| SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this); |
| if (nullptr == nameIter) { |
| SkString familyName; |
| this->getFamilyName(&familyName); |
| SkString language("und"); //undetermined |
| nameIter = new SkOTUtils::LocalizedStrings_SingleName(familyName, language); |
| } |
| return nameIter; |
| } |
| |
| int SkTypeface_FreeType::onGetTableTags(SkFontTableTag tags[]) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| |
| FT_ULong tableCount = 0; |
| FT_Error error; |
| |
| // When 'tag' is nullptr, returns number of tables in 'length'. |
| error = FT_Sfnt_Table_Info(face, 0, nullptr, &tableCount); |
| if (error) { |
| return 0; |
| } |
| |
| if (tags) { |
| for (FT_ULong tableIndex = 0; tableIndex < tableCount; ++tableIndex) { |
| FT_ULong tableTag; |
| FT_ULong tablelength; |
| error = FT_Sfnt_Table_Info(face, tableIndex, &tableTag, &tablelength); |
| if (error) { |
| return 0; |
| } |
| tags[tableIndex] = static_cast<SkFontTableTag>(tableTag); |
| } |
| } |
| return tableCount; |
| } |
| |
| size_t SkTypeface_FreeType::onGetTableData(SkFontTableTag tag, size_t offset, |
| size_t length, void* data) const |
| { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| |
| FT_ULong tableLength = 0; |
| FT_Error error; |
| |
| // When 'length' is 0 it is overwritten with the full table length; 'offset' is ignored. |
| error = FT_Load_Sfnt_Table(face, tag, 0, nullptr, &tableLength); |
| if (error) { |
| return 0; |
| } |
| |
| if (offset > tableLength) { |
| return 0; |
| } |
| FT_ULong size = SkTMin((FT_ULong)length, tableLength - (FT_ULong)offset); |
| if (data) { |
| error = FT_Load_Sfnt_Table(face, tag, offset, reinterpret_cast<FT_Byte*>(data), &size); |
| if (error) { |
| return 0; |
| } |
| } |
| |
| return size; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkTypeface_FreeType::Scanner::Scanner() : fLibrary(nullptr) { |
| if (FT_New_Library(&gFTMemory, &fLibrary)) { |
| return; |
| } |
| FT_Add_Default_Modules(fLibrary); |
| } |
| SkTypeface_FreeType::Scanner::~Scanner() { |
| if (fLibrary) { |
| FT_Done_Library(fLibrary); |
| } |
| } |
| |
| FT_Face SkTypeface_FreeType::Scanner::openFace(SkStream* stream, int ttcIndex, |
| FT_Stream ftStream) const |
| { |
| if (fLibrary == nullptr) { |
| return nullptr; |
| } |
| |
| FT_Open_Args args; |
| memset(&args, 0, sizeof(args)); |
| |
| const void* memoryBase = stream->getMemoryBase(); |
| |
| if (memoryBase) { |
| args.flags = FT_OPEN_MEMORY; |
| args.memory_base = (const FT_Byte*)memoryBase; |
| args.memory_size = stream->getLength(); |
| } else { |
| memset(ftStream, 0, sizeof(*ftStream)); |
| ftStream->size = stream->getLength(); |
| ftStream->descriptor.pointer = stream; |
| ftStream->read = sk_ft_stream_io; |
| ftStream->close = sk_ft_stream_close; |
| |
| args.flags = FT_OPEN_STREAM; |
| args.stream = ftStream; |
| } |
| |
| FT_Face face; |
| if (FT_Open_Face(fLibrary, &args, ttcIndex, &face)) { |
| return nullptr; |
| } |
| return face; |
| } |
| |
| bool SkTypeface_FreeType::Scanner::recognizedFont(SkStream* stream, int* numFaces) const { |
| SkAutoMutexAcquire libraryLock(fLibraryMutex); |
| |
| FT_StreamRec streamRec; |
| FT_Face face = this->openFace(stream, -1, &streamRec); |
| if (nullptr == face) { |
| return false; |
| } |
| |
| *numFaces = face->num_faces; |
| |
| FT_Done_Face(face); |
| return true; |
| } |
| |
| #include "SkTSearch.h" |
| bool SkTypeface_FreeType::Scanner::scanFont( |
| SkStream* stream, int ttcIndex, |
| SkString* name, SkFontStyle* style, bool* isFixedPitch, AxisDefinitions* axes) const |
| { |
| SkAutoMutexAcquire libraryLock(fLibraryMutex); |
| |
| FT_StreamRec streamRec; |
| FT_Face face = this->openFace(stream, ttcIndex, &streamRec); |
| if (nullptr == face) { |
| return false; |
| } |
| |
| int weight = SkFontStyle::kNormal_Weight; |
| int width = SkFontStyle::kNormal_Width; |
| SkFontStyle::Slant slant = SkFontStyle::kUpright_Slant; |
| if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
| weight = SkFontStyle::kBold_Weight; |
| } |
| if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
| slant = SkFontStyle::kItalic_Slant; |
| } |
| |
| PS_FontInfoRec psFontInfo; |
| TT_OS2* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(face, ft_sfnt_os2)); |
| if (os2 && os2->version != 0xffff) { |
| weight = os2->usWeightClass; |
| width = os2->usWidthClass; |
| } else if (0 == FT_Get_PS_Font_Info(face, &psFontInfo) && psFontInfo.weight) { |
| static const struct { |
| char const * const name; |
| int const weight; |
| } commonWeights [] = { |
| // There are probably more common names, but these are known to exist. |
| { "all", SkFontStyle::kNormal_Weight }, // Multiple Masters usually default to normal. |
| { "black", SkFontStyle::kBlack_Weight }, |
| { "bold", SkFontStyle::kBold_Weight }, |
| { "book", (SkFontStyle::kNormal_Weight + SkFontStyle::kLight_Weight)/2 }, |
| { "demi", SkFontStyle::kSemiBold_Weight }, |
| { "demibold", SkFontStyle::kSemiBold_Weight }, |
| { "extra", SkFontStyle::kExtraBold_Weight }, |
| { "extrabold", SkFontStyle::kExtraBold_Weight }, |
| { "extralight", SkFontStyle::kExtraLight_Weight }, |
| { "hairline", SkFontStyle::kThin_Weight }, |
| { "heavy", SkFontStyle::kBlack_Weight }, |
| { "light", SkFontStyle::kLight_Weight }, |
| { "medium", SkFontStyle::kMedium_Weight }, |
| { "normal", SkFontStyle::kNormal_Weight }, |
| { "plain", SkFontStyle::kNormal_Weight }, |
| { "regular", SkFontStyle::kNormal_Weight }, |
| { "roman", SkFontStyle::kNormal_Weight }, |
| { "semibold", SkFontStyle::kSemiBold_Weight }, |
| { "standard", SkFontStyle::kNormal_Weight }, |
| { "thin", SkFontStyle::kThin_Weight }, |
| { "ultra", SkFontStyle::kExtraBold_Weight }, |
| { "ultrablack", 1000 }, |
| { "ultrabold", SkFontStyle::kExtraBold_Weight }, |
| { "ultraheavy", 1000 }, |
| { "ultralight", SkFontStyle::kExtraLight_Weight }, |
| }; |
| int const index = SkStrLCSearch(&commonWeights[0].name, SK_ARRAY_COUNT(commonWeights), |
| psFontInfo.weight, sizeof(commonWeights[0])); |
| if (index >= 0) { |
| weight = commonWeights[index].weight; |
| } else { |
| SkDEBUGF(("Do not know weight for: %s (%s) \n", face->family_name, psFontInfo.weight)); |
| } |
| } |
| |
| if (name) { |
| name->set(face->family_name); |
| } |
| if (style) { |
| *style = SkFontStyle(weight, width, slant); |
| } |
| if (isFixedPitch) { |
| *isFixedPitch = FT_IS_FIXED_WIDTH(face); |
| } |
| |
| if (axes && face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) { |
| FT_MM_Var* variations = nullptr; |
| FT_Error err = FT_Get_MM_Var(face, &variations); |
| if (err) { |
| SkDEBUGF(("INFO: font %s claims to have variations, but none found.\n", |
| face->family_name)); |
| return false; |
| } |
| SkAutoFree autoFreeVariations(variations); |
| |
| axes->reset(variations->num_axis); |
| for (FT_UInt i = 0; i < variations->num_axis; ++i) { |
| const FT_Var_Axis& ftAxis = variations->axis[i]; |
| (*axes)[i].fTag = ftAxis.tag; |
| (*axes)[i].fMinimum = ftAxis.minimum; |
| (*axes)[i].fDefault = ftAxis.def; |
| (*axes)[i].fMaximum = ftAxis.maximum; |
| } |
| } |
| |
| FT_Done_Face(face); |
| return true; |
| } |
| |
| /*static*/ void SkTypeface_FreeType::Scanner::computeAxisValues( |
| AxisDefinitions axisDefinitions, |
| const SkFontMgr::FontParameters::Axis* requestedAxes, int requestedAxisCount, |
| SkFixed* axisValues, |
| const SkString& name) |
| { |
| for (int i = 0; i < axisDefinitions.count(); ++i) { |
| const Scanner::AxisDefinition& axisDefinition = axisDefinitions[i]; |
| const SkScalar axisMin = SkFixedToScalar(axisDefinition.fMinimum); |
| const SkScalar axisMax = SkFixedToScalar(axisDefinition.fMaximum); |
| axisValues[i] = axisDefinition.fDefault; |
| for (int j = 0; j < requestedAxisCount; ++j) { |
| const SkFontMgr::FontParameters::Axis& axisSpecified = requestedAxes[j]; |
| if (axisDefinition.fTag == axisSpecified.fTag) { |
| const SkScalar axisValue = SkTPin(axisSpecified.fStyleValue, axisMin, axisMax); |
| if (axisSpecified.fStyleValue != axisValue) { |
| SkDEBUGF(("Requested font axis value out of range: " |
| "%s '%c%c%c%c' %f; pinned to %f.\n", |
| name.c_str(), |
| (axisDefinition.fTag >> 24) & 0xFF, |
| (axisDefinition.fTag >> 16) & 0xFF, |
| (axisDefinition.fTag >> 8) & 0xFF, |
| (axisDefinition.fTag ) & 0xFF, |
| SkScalarToDouble(axisSpecified.fStyleValue), |
| SkScalarToDouble(axisValue))); |
| } |
| axisValues[i] = SkScalarToFixed(axisValue); |
| break; |
| } |
| } |
| // TODO: warn on defaulted axis? |
| } |
| |
| SkDEBUGCODE( |
| // Check for axis specified, but not matched in font. |
| for (int i = 0; i < requestedAxisCount; ++i) { |
| SkFourByteTag skTag = requestedAxes[i].fTag; |
| bool found = false; |
| for (int j = 0; j < axisDefinitions.count(); ++j) { |
| if (skTag == axisDefinitions[j].fTag) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) { |
| SkDEBUGF(("Requested font axis not found: %s '%c%c%c%c'\n", |
| name.c_str(), |
| (skTag >> 24) & 0xFF, |
| (skTag >> 16) & 0xFF, |
| (skTag >> 8) & 0xFF, |
| (skTag) & 0xFF)); |
| } |
| } |
| ) |
| } |
