| /* |
| * 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 "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkData.h" |
| #include "include/core/SkFontMetrics.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkStream.h" |
| #include "include/core/SkString.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/SkMalloc.h" |
| #include "include/private/SkMutex.h" |
| #include "include/private/SkTPin.h" |
| #include "include/private/SkTemplates.h" |
| #include "include/private/SkTo.h" |
| #include "src/core/SkAdvancedTypefaceMetrics.h" |
| #include "src/core/SkDescriptor.h" |
| #include "src/core/SkFDot6.h" |
| #include "src/core/SkFontDescriptor.h" |
| #include "src/core/SkGlyph.h" |
| #include "src/core/SkMask.h" |
| #include "src/core/SkMaskGamma.h" |
| #include "src/core/SkScalerContext.h" |
| #include "src/ports/SkFontHost_FreeType_common.h" |
| #include "src/sfnt/SkOTUtils.h" |
| #include "src/utils/SkCallableTraits.h" |
| #include "src/utils/SkMatrix22.h" |
| |
| #include <memory> |
| #include <tuple> |
| |
| #include <ft2build.h> |
| #include FT_ADVANCES_H |
| #include FT_BITMAP_H |
| #ifdef FT_COLOR_H |
| # include FT_COLOR_H |
| #endif |
| #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 |
| |
| // SK_FREETYPE_MINIMUM_RUNTIME_VERSION 0x<major><minor><patch><flags> |
| // Flag SK_FREETYPE_DLOPEN: also try dlopen to get newer features. |
| #define SK_FREETYPE_DLOPEN (0x1) |
| #ifndef SK_FREETYPE_MINIMUM_RUNTIME_VERSION |
| # if defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) || defined (SK_BUILD_FOR_GOOGLE3) |
| # define SK_FREETYPE_MINIMUM_RUNTIME_VERSION (((FREETYPE_MAJOR) << 24) | ((FREETYPE_MINOR) << 16) | ((FREETYPE_PATCH) << 8)) |
| # else |
| # define SK_FREETYPE_MINIMUM_RUNTIME_VERSION ((2 << 24) | (3 << 16) | (11 << 8) | (SK_FREETYPE_DLOPEN)) |
| # endif |
| #endif |
| #if SK_FREETYPE_MINIMUM_RUNTIME_VERSION & SK_FREETYPE_DLOPEN |
| # include <dlfcn.h> |
| #endif |
| |
| // 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 |
| |
| // FT_LOAD_BITMAP_METRICS_ONLY was introduced in FreeType 2.7.1 |
| // The following may be removed once FreeType 2.7.1 is required to build. |
| #ifndef FT_LOAD_BITMAP_METRICS_ONLY |
| # define FT_LOAD_BITMAP_METRICS_ONLY ( 1L << 22 ) |
| #endif |
| |
| // FT_VAR_AXIS_FLAG_HIDDEN was introduced in FreeType 2.8.1 |
| // The variation axis should not be exposed to user interfaces. |
| #ifndef FT_VAR_AXIS_FLAG_HIDDEN |
| # define FT_VAR_AXIS_FLAG_HIDDEN 1 |
| #endif |
| |
| //#define ENABLE_GLYPH_SPEW // for tracing calls |
| //#define DUMP_STRIKE_CREATION |
| //#define SK_FONTHOST_FREETYPE_RUNTIME_VERSION |
| //#define SK_GAMMA_APPLY_TO_A8 |
| |
| #if 1 |
| #define LOG_INFO(...) |
| #else |
| #define LOG_INFO SkDEBUGF |
| #endif |
| |
| static bool isLCD(const SkScalerContextRec& rec) { |
| return SkMask::kLCD16_Format == rec.fMaskFormat; |
| } |
| |
| static SkScalar SkFT_FixedToScalar(FT_Fixed x) { |
| return SkFixedToScalar(x); |
| } |
| |
| using SkUniqueFTFace = |
| std::unique_ptr<FT_FaceRec, SkFunctionWrapper<decltype(FT_Done_Face), FT_Done_Face>>; |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| using FT_Alloc_size_t = SkCallableTraits<FT_Alloc_Func>::argument<1>::type; |
| static_assert(std::is_same<FT_Alloc_size_t, long >::value || |
| std::is_same<FT_Alloc_size_t, size_t>::value,""); |
| |
| extern "C" { |
| static void* sk_ft_alloc(FT_Memory, FT_Alloc_size_t 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, FT_Alloc_size_t cur_size, |
| FT_Alloc_size_t 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() |
| : fGetVarDesignCoordinates(nullptr) |
| , fGetVarAxisFlags(nullptr) |
| , fLibrary(nullptr) |
| , fIsLCDSupported(false) |
| , fLightHintingIsYOnly(false) |
| , fLCDExtra(0) |
| { |
| if (FT_New_Library(&gFTMemory, &fLibrary)) { |
| return; |
| } |
| FT_Add_Default_Modules(fLibrary); |
| |
| // When using dlsym |
| // *(void**)(&procPtr) = dlsym(self, "proc"); |
| // is non-standard, but safe for POSIX. Cannot write |
| // *reinterpret_cast<void**>(&procPtr) = dlsym(self, "proc"); |
| // because clang has not implemented DR573. See http://clang.llvm.org/cxx_dr_status.html . |
| |
| using Version = std::tuple<FT_Int, FT_Int, FT_Int>; |
| Version version; |
| FT_Library_Version(fLibrary, &std::get<0>(version), |
| &std::get<1>(version), |
| &std::get<2>(version)); |
| |
| #if SK_FREETYPE_MINIMUM_RUNTIME_VERSION >= 0x02070100 |
| fGetVarDesignCoordinates = FT_Get_Var_Design_Coordinates; |
| #elif SK_FREETYPE_MINIMUM_RUNTIME_VERSION & SK_FREETYPE_DLOPEN |
| if (Version(2,7,0) <= version) { |
| //The FreeType library is already loaded, so symbols are available in process. |
| void* self = dlopen(nullptr, RTLD_LAZY); |
| if (self) { |
| *(void**)(&fGetVarDesignCoordinates) = dlsym(self, "FT_Get_Var_Design_Coordinates"); |
| dlclose(self); |
| } |
| } |
| #endif |
| |
| #if SK_FREETYPE_MINIMUM_RUNTIME_VERSION >= 0x02070200 |
| FT_Set_Default_Properties(fLibrary); |
| #elif SK_FREETYPE_MINIMUM_RUNTIME_VERSION & SK_FREETYPE_DLOPEN |
| if (Version(2,7,1) <= version) { |
| //The FreeType library is already loaded, so symbols are available in process. |
| void* self = dlopen(nullptr, RTLD_LAZY); |
| if (self) { |
| FT_Set_Default_PropertiesProc setDefaultProperties; |
| *(void**)(&setDefaultProperties) = dlsym(self, "FT_Set_Default_Properties"); |
| dlclose(self); |
| |
| if (setDefaultProperties) { |
| setDefaultProperties(fLibrary); |
| } |
| } |
| } |
| #endif |
| |
| // The 'light' hinting is vertical only starting in 2.8.0. |
| #if SK_FREETYPE_MINIMUM_RUNTIME_VERSION >= 0x02080000 |
| fLightHintingIsYOnly = true; |
| #else |
| if (Version(2,8,0) <= version) { |
| fLightHintingIsYOnly = true; |
| } |
| #endif |
| |
| |
| #if SK_FREETYPE_MINIMUM_RUNTIME_VERSION >= 0x02080100 |
| fGetVarAxisFlags = FT_Get_Var_Axis_Flags; |
| #elif SK_FREETYPE_MINIMUM_RUNTIME_VERSION & SK_FREETYPE_DLOPEN |
| if (Version(2,7,0) <= version) { |
| //The FreeType library is already loaded, so symbols are available in process. |
| void* self = dlopen(nullptr, RTLD_LAZY); |
| if (self) { |
| *(void**)(&fGetVarAxisFlags) = dlsym(self, "FT_Get_Var_Axis_Flags"); |
| dlclose(self); |
| } |
| } |
| #endif |
| |
| fIsLCDSupported = |
| // Subpixel anti-aliasing may be unfiltered until the LCD filter is set. |
| // Newer versions may still need this, so this test with side effects must come first. |
| // The default has changed over time, so this doesn't mean the same thing to all users. |
| (FT_Library_SetLcdFilter(fLibrary, FT_LCD_FILTER_DEFAULT) == 0) || |
| |
| // In 2.8.1 and later FreeType always provides some form of subpixel anti-aliasing. |
| ((SK_FREETYPE_MINIMUM_RUNTIME_VERSION) >= 0x02080100) || |
| (Version(2,8,1) <= version); |
| |
| if (fIsLCDSupported) { |
| fLCDExtra = 2; // Using a filter may require up to one full pixel to each side. |
| } |
| } |
| ~FreeTypeLibrary() { |
| if (fLibrary) { |
| FT_Done_Library(fLibrary); |
| } |
| } |
| |
| FT_Library library() { return fLibrary; } |
| bool isLCDSupported() { return fIsLCDSupported; } |
| int lcdExtra() { return fLCDExtra; } |
| bool lightHintingIsYOnly() { return fLightHintingIsYOnly; } |
| |
| // FT_Get_{MM,Var}_{Blend,Design}_Coordinates were added in FreeType 2.7.1. |
| // Prior to this there was no way to get the coordinates out of the FT_Face. |
| // This wasn't too bad because you needed to specify them anyway, and the clamp was provided. |
| // However, this doesn't work when face_index specifies named variations as introduced in 2.6.1. |
| using FT_Get_Var_Blend_CoordinatesProc = FT_Error (*)(FT_Face, FT_UInt, FT_Fixed*); |
| FT_Get_Var_Blend_CoordinatesProc fGetVarDesignCoordinates; |
| |
| // FT_Get_Var_Axis_Flags was introduced in FreeType 2.8.1 |
| // Get the ‘flags’ field of an OpenType Variation Axis Record. |
| // Not meaningful for Adobe MM fonts (‘*flags’ is always zero). |
| using FT_Get_Var_Axis_FlagsProc = FT_Error (*)(FT_MM_Var*, FT_UInt, FT_UInt*); |
| FT_Get_Var_Axis_FlagsProc fGetVarAxisFlags; |
| |
| private: |
| FT_Library fLibrary; |
| bool fIsLCDSupported; |
| bool fLightHintingIsYOnly; |
| 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) |
| // RHEL >= 7 (6 has 2.3.11, EOL Nov 2020, Phase 3 May 2017) |
| using FT_Library_SetLcdFilterWeightsProc = FT_Error (*)(FT_Library, unsigned char*); |
| |
| // FreeType added the ability to read global properties in 2.7.0. After 2.7.1 a means for users |
| // of FT_New_Library to request these global properties to be read was added. |
| using FT_Set_Default_PropertiesProc = void (*)(FT_Library); |
| }; |
| |
| static SkMutex& f_t_mutex() { |
| static SkMutex& mutex = *(new SkMutex); |
| return mutex; |
| } |
| |
| static FreeTypeLibrary* gFTLibrary; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| class SkTypeface_FreeType::FaceRec { |
| public: |
| SkUniqueFTFace fFace; |
| FT_StreamRec fFTStream; |
| std::unique_ptr<SkStreamAsset> fSkStream; |
| |
| // FreeType prior to 2.7.1 does not implement retreiving variation design metrics. |
| // Cache the variation design metrics used to create the font if the user specifies them. |
| SkAutoSTMalloc<4, SkFixed> fAxes; |
| int fAxesCount; |
| |
| // FreeType from 2.6.1 (14d6b5d7) until 2.7.0 (ee3f36f6b38) uses font_index for both font index |
| // and named variation index on input, but masks the named variation index part on output. |
| // Manually keep track of when a named variation is requested for 2.6.1 until 2.7.1. |
| bool fNamedVariationSpecified; |
| |
| static std::unique_ptr<FaceRec> Make(const SkTypeface_FreeType* typeface); |
| ~FaceRec(); |
| |
| private: |
| FaceRec(std::unique_ptr<SkStreamAsset> stream); |
| void setupAxes(const SkFontData& data); |
| |
| // Private to ref_ft_library and unref_ft_library |
| static int gFTCount; |
| |
| // Caller must lock f_t_mutex() before calling this function. |
| static bool ref_ft_library() { |
| f_t_mutex().assertHeld(); |
| SkASSERT(gFTCount >= 0); |
| |
| if (0 == gFTCount) { |
| SkASSERT(nullptr == gFTLibrary); |
| gFTLibrary = new FreeTypeLibrary; |
| } |
| ++gFTCount; |
| return gFTLibrary->library(); |
| } |
| |
| // Caller must lock f_t_mutex() before calling this function. |
| static void unref_ft_library() { |
| f_t_mutex().assertHeld(); |
| SkASSERT(gFTCount > 0); |
| |
| --gFTCount; |
| if (0 == gFTCount) { |
| SkASSERT(nullptr != gFTLibrary); |
| delete gFTLibrary; |
| SkDEBUGCODE(gFTLibrary = nullptr;) |
| } |
| } |
| }; |
| int SkTypeface_FreeType::FaceRec::gFTCount; |
| |
| 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) {} |
| } |
| |
| SkTypeface_FreeType::FaceRec::FaceRec(std::unique_ptr<SkStreamAsset> stream) |
| : fSkStream(std::move(stream)), fAxesCount(0), fNamedVariationSpecified(false) |
| { |
| sk_bzero(&fFTStream, sizeof(fFTStream)); |
| fFTStream.size = fSkStream->getLength(); |
| fFTStream.descriptor.pointer = fSkStream.get(); |
| fFTStream.read = sk_ft_stream_io; |
| fFTStream.close = sk_ft_stream_close; |
| |
| f_t_mutex().assertHeld(); |
| ref_ft_library(); |
| } |
| |
| SkTypeface_FreeType::FaceRec::~FaceRec() { |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| fFace.reset(); // Must release face before the library, the library frees existing faces. |
| unref_ft_library(); |
| } |
| |
| void SkTypeface_FreeType::FaceRec::setupAxes(const SkFontData& data) { |
| if (!(fFace->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) { |
| return; |
| } |
| |
| // If a named variation is requested, don't overwrite the named variation's position. |
| if (data.getIndex() > 0xFFFF) { |
| fNamedVariationSpecified = true; |
| return; |
| } |
| |
| SkDEBUGCODE( |
| FT_MM_Var* variations = nullptr; |
| if (FT_Get_MM_Var(fFace.get(), &variations)) { |
| LOG_INFO("INFO: font %s claims variations, but none found.\n", |
| rec->fFace->family_name); |
| return; |
| } |
| SkAutoFree autoFreeVariations(variations); |
| |
| if (static_cast<FT_UInt>(data.getAxisCount()) != variations->num_axis) { |
| LOG_INFO("INFO: font %s has %d variations, but %d were specified.\n", |
| rec->fFace->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(fFace.get(), data.getAxisCount(), coords.get())) { |
| LOG_INFO("INFO: font %s has variations, but specified variations could not be set.\n", |
| rec->fFace->family_name); |
| return; |
| } |
| |
| fAxesCount = data.getAxisCount(); |
| fAxes.reset(fAxesCount); |
| for (int i = 0; i < fAxesCount; ++i) { |
| fAxes[i] = data.getAxis()[i]; |
| } |
| } |
| |
| // Will return nullptr on failure |
| // Caller must lock f_t_mutex() before calling this function. |
| std::unique_ptr<SkTypeface_FreeType::FaceRec> |
| SkTypeface_FreeType::FaceRec::Make(const SkTypeface_FreeType* typeface) { |
| f_t_mutex().assertHeld(); |
| |
| std::unique_ptr<SkFontData> data = typeface->makeFontData(); |
| if (nullptr == data || !data->hasStream()) { |
| return nullptr; |
| } |
| |
| std::unique_ptr<FaceRec> rec(new FaceRec(data->detachStream())); |
| |
| 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_Face rawFace; |
| FT_Error err = FT_Open_Face(gFTLibrary->library(), &args, data->getIndex(), &rawFace); |
| if (err) { |
| SK_TRACEFTR(err, "unable to open font '%x'", typeface->uniqueID()); |
| return nullptr; |
| } |
| rec->fFace.reset(rawFace); |
| } |
| SkASSERT(rec->fFace); |
| |
| rec->setupAxes(*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.get(), FT_ENCODING_MS_SYMBOL); |
| } |
| |
| return rec; |
| } |
| |
| class AutoFTAccess { |
| public: |
| AutoFTAccess(const SkTypeface_FreeType* tf) : fFaceRec(nullptr) { |
| f_t_mutex().acquire(); |
| fFaceRec = tf->getFaceRec(); |
| } |
| |
| ~AutoFTAccess() { |
| f_t_mutex().release(); |
| } |
| |
| FT_Face face() { return fFaceRec ? fFaceRec->fFace.get() : nullptr; } |
| int getAxesCount() { return fFaceRec ? fFaceRec->fAxesCount : 0; } |
| SkFixed* getAxes() { return fFaceRec ? fFaceRec->fAxes.get() : nullptr; } |
| bool isNamedVariationSpecified() { |
| return fFaceRec ? fFaceRec->fNamedVariationSpecified : false; |
| } |
| |
| private: |
| SkTypeface_FreeType::FaceRec* fFaceRec; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { |
| public: |
| SkScalerContext_FreeType(sk_sp<SkTypeface_FreeType>, |
| const SkScalerContextEffects&, |
| const SkDescriptor* desc); |
| ~SkScalerContext_FreeType() override; |
| |
| bool success() const { |
| return fFTSize != nullptr && fFace != nullptr; |
| } |
| |
| protected: |
| bool generateAdvance(SkGlyph* glyph) override; |
| void generateMetrics(SkGlyph* glyph) override; |
| void generateImage(const SkGlyph& glyph) override; |
| bool generatePath(SkGlyphID glyphID, SkPath* path) override; |
| void generateFontMetrics(SkFontMetrics*) override; |
| |
| private: |
| SkTypeface_FreeType::FaceRec* fFaceRec; // Borrowed face from the typeface's FaceRec. |
| FT_Face fFace; // Borrowed face from fFaceRec. |
| FT_Size fFTSize; // The size to apply to the fFace. |
| FT_Int fStrikeIndex; // The bitmap strike for the fFace (or -1 if none). |
| |
| /** The rest of the matrix after FreeType handles the size. |
| * With outline font rasterization this is handled by FreeType with FT_Set_Transform. |
| * With bitmap only fonts this matrix must be applied to scale the bitmap. |
| */ |
| SkMatrix fMatrix22Scalar; |
| /** Same as fMatrix22Scalar, but in FreeType units and space. */ |
| FT_Matrix fMatrix22; |
| /** The actual size requested. */ |
| SkVector fScale; |
| |
| uint32_t fLoadGlyphFlags; |
| bool fDoLinearMetrics; |
| bool fLCDIsVert; |
| |
| FT_Error setupSize(); |
| void getBBoxForCurrentGlyph(const SkGlyph* glyph, FT_BBox* bbox, |
| bool snapToPixelBoundary = false); |
| bool getCBoxForLetter(char letter, FT_BBox* bbox); |
| // Caller must lock f_t_mutex() before calling this function. |
| void updateGlyphIfLCD(SkGlyph* glyph); |
| // Caller must lock f_t_mutex() before calling this function. |
| // update FreeType2 glyph slot with glyph emboldened |
| void emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph, SkGlyphID gid); |
| bool shouldSubpixelBitmap(const SkGlyph&, const SkMatrix&); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| 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 SkAdvancedTypefaceMetrics::FontType get_font_type(FT_Face face) { |
| const char* fontType = FT_Get_X11_Font_Format(face); |
| static struct { const char* s; SkAdvancedTypefaceMetrics::FontType t; } values[] = { |
| { "Type 1", SkAdvancedTypefaceMetrics::kType1_Font }, |
| { "CID Type 1", SkAdvancedTypefaceMetrics::kType1CID_Font }, |
| { "CFF", SkAdvancedTypefaceMetrics::kCFF_Font }, |
| { "TrueType", SkAdvancedTypefaceMetrics::kTrueType_Font }, |
| }; |
| for(const auto& v : values) { if (strcmp(fontType, v.s) == 0) { return v.t; } } |
| return SkAdvancedTypefaceMetrics::kOther_Font; |
| } |
| |
| std::unique_ptr<SkAdvancedTypefaceMetrics> SkTypeface_FreeType::onGetAdvancedMetrics() const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return nullptr; |
| } |
| |
| std::unique_ptr<SkAdvancedTypefaceMetrics> info(new SkAdvancedTypefaceMetrics); |
| info->fPostScriptName.set(FT_Get_Postscript_Name(face)); |
| info->fFontName = info->fPostScriptName; |
| |
| if (FT_HAS_MULTIPLE_MASTERS(face)) { |
| info->fFlags |= SkAdvancedTypefaceMetrics::kVariable_FontFlag; |
| } |
| if (!canEmbed(face)) { |
| info->fFlags |= SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag; |
| } |
| if (!canSubset(face)) { |
| info->fFlags |= SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag; |
| } |
| |
| info->fType = get_font_type(face); |
| info->fStyle = (SkAdvancedTypefaceMetrics::StyleFlags)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 psFontInfo; |
| TT_Postscript* postTable; |
| if (FT_Get_PS_Font_Info(face, &psFontInfo) == 0) { |
| info->fItalicAngle = psFontInfo.italic_angle; |
| } else if ((postTable = (TT_Postscript*)FT_Get_Sfnt_Table(face, ft_sfnt_post)) != nullptr) { |
| info->fItalicAngle = SkFixedFloorToInt(postTable->italicAngle); |
| } else { |
| info->fItalicAngle = 0; |
| } |
| |
| info->fAscent = face->ascender; |
| info->fDescent = face->descender; |
| |
| TT_PCLT* pcltTable; |
| TT_OS2* os2Table; |
| if ((pcltTable = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != nullptr) { |
| info->fCapHeight = pcltTable->CapHeight; |
| uint8_t serif_style = pcltTable->SerifStyle & 0x3F; |
| if (2 <= serif_style && serif_style <= 6) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
| } else if (9 <= serif_style && serif_style <= 12) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
| } |
| } else if (((os2Table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != nullptr) && |
| // sCapHeight is available only when version 2 or later. |
| os2Table->version != 0xFFFF && |
| os2Table->version >= 2) |
| { |
| info->fCapHeight = os2Table->sCapHeight; |
| } |
| info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| face->bbox.xMax, face->bbox.yMin); |
| return info; |
| } |
| |
| void SkTypeface_FreeType::getGlyphToUnicodeMap(SkUnichar* dstArray) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return; |
| } |
| |
| FT_Long numGlyphs = face->num_glyphs; |
| if (!dstArray) { SkASSERT(numGlyphs == 0); } |
| sk_bzero(dstArray, sizeof(SkUnichar) * numGlyphs); |
| |
| FT_UInt glyphIndex; |
| SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); |
| while (glyphIndex) { |
| SkASSERT(glyphIndex < SkToUInt(numGlyphs)); |
| // Use the first character that maps to this glyphID. https://crbug.com/359065 |
| if (0 == dstArray[glyphIndex]) { |
| dstArray[glyphIndex] = charCode; |
| } |
| charCode = FT_Get_Next_Char(face, charCode, &glyphIndex); |
| } |
| } |
| |
| void SkTypeface_FreeType::getPostScriptGlyphNames(SkString* dstArray) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return; |
| } |
| |
| FT_Long numGlyphs = face->num_glyphs; |
| if (!dstArray) { SkASSERT(numGlyphs == 0); } |
| |
| if (FT_HAS_GLYPH_NAMES(face)) { |
| for (int gID = 0; gID < numGlyphs; ++gID) { |
| char glyphName[128]; // PS limit for names is 127 bytes. |
| FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| dstArray[gID] = glyphName; |
| } |
| } |
| } |
| |
| bool SkTypeface_FreeType::onGetPostScriptName(SkString* skPostScriptName) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return false; |
| } |
| |
| const char* ftPostScriptName = FT_Get_Postscript_Name(face); |
| if (!ftPostScriptName) { |
| return false; |
| } |
| if (skPostScriptName) { |
| *skPostScriptName = ftPostScriptName; |
| } |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| 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 SkScalerContextRec& rec) { |
| return 0 == rec.fPreSkewX && |
| (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || |
| bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); |
| } |
| |
| std::unique_ptr<SkScalerContext> SkTypeface_FreeType::onCreateScalerContext( |
| const SkScalerContextEffects& effects, const SkDescriptor* desc) const |
| { |
| auto c = std::make_unique<SkScalerContext_FreeType>( |
| sk_ref_sp(const_cast<SkTypeface_FreeType*>(this)), effects, desc); |
| if (c->success()) { |
| return std::move(c); |
| } |
| return SkScalerContext::MakeEmpty( |
| sk_ref_sp(const_cast<SkTypeface_FreeType*>(this)), effects, desc); |
| } |
| |
| /** Copy the design variation coordinates into 'coordinates'. |
| * |
| * @param coordinates the buffer into which to write the design variation coordinates. |
| * @param coordinateCount the number of entries available through 'coordinates'. |
| * |
| * @return The number of axes, or -1 if there is an error. |
| * If 'coordinates != nullptr' and 'coordinateCount >= numAxes' then 'coordinates' will be |
| * filled with the variation coordinates describing the position of this typeface in design |
| * variation space. It is possible the number of axes can be retrieved but actual position |
| * cannot. |
| */ |
| static int GetVariationDesignPosition(AutoFTAccess& fta, |
| SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) |
| { |
| FT_Face face = fta.face(); |
| if (!face) { |
| return -1; |
| } |
| |
| if (!(face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) { |
| return 0; |
| } |
| |
| FT_MM_Var* variations = nullptr; |
| if (FT_Get_MM_Var(face, &variations)) { |
| return -1; |
| } |
| SkAutoFree autoFreeVariations(variations); |
| |
| if (!coordinates || coordinateCount < SkToInt(variations->num_axis)) { |
| return variations->num_axis; |
| } |
| |
| SkAutoSTMalloc<4, FT_Fixed> coords(variations->num_axis); |
| // FT_Get_{MM,Var}_{Blend,Design}_Coordinates were added in FreeType 2.7.1. |
| if (gFTLibrary->fGetVarDesignCoordinates && |
| !gFTLibrary->fGetVarDesignCoordinates(face, variations->num_axis, coords.get())) |
| { |
| for (FT_UInt i = 0; i < variations->num_axis; ++i) { |
| coordinates[i].axis = variations->axis[i].tag; |
| coordinates[i].value = SkFixedToScalar(coords[i]); |
| } |
| } else if (static_cast<FT_UInt>(fta.getAxesCount()) == variations->num_axis) { |
| for (FT_UInt i = 0; i < variations->num_axis; ++i) { |
| coordinates[i].axis = variations->axis[i].tag; |
| coordinates[i].value = SkFixedToScalar(fta.getAxes()[i]); |
| } |
| } else if (fta.isNamedVariationSpecified()) { |
| // The font has axes, they cannot be retrieved, and some named axis was specified. |
| return -1; |
| } else { |
| // The font has axes, they cannot be retrieved, but no named instance was specified. |
| return 0; |
| } |
| |
| return variations->num_axis; |
| } |
| |
| std::unique_ptr<SkFontData> SkTypeface_FreeType::cloneFontData(const SkFontArguments& args) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return nullptr; |
| } |
| |
| Scanner::AxisDefinitions axisDefinitions; |
| if (!Scanner::GetAxes(face, &axisDefinitions)) { |
| return nullptr; |
| } |
| int axisCount = axisDefinitions.count(); |
| |
| SkAutoSTMalloc<4, SkFontArguments::VariationPosition::Coordinate> currentPosition(axisCount); |
| int currentAxisCount = GetVariationDesignPosition(fta, currentPosition, axisCount); |
| |
| SkString name; |
| SkAutoSTMalloc<4, SkFixed> axisValues(axisCount); |
| Scanner::computeAxisValues(axisDefinitions, args.getVariationDesignPosition(), axisValues, name, |
| currentAxisCount == axisCount ? currentPosition.get() : nullptr); |
| int ttcIndex; |
| std::unique_ptr<SkStreamAsset> stream = this->openStream(&ttcIndex); |
| return std::make_unique<SkFontData>(std::move(stream), ttcIndex, axisValues.get(), axisCount); |
| } |
| |
| 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)) { |
| SkAutoMutexExclusive ama(f_t_mutex()); |
| // getFaceRec creates the FaceRec if needed, which ensures that the gFTLibrary exists. |
| if (this->getFaceRec() && !gFTLibrary->isLCDSupported()) { |
| // If the runtime Freetype library doesn't support LCD, disable it here. |
| rec->fMaskFormat = SkMask::kA8_Format; |
| } |
| } |
| |
| SkFontHinting h = rec->getHinting(); |
| if (SkFontHinting::kFull == h && !isLCD(*rec)) { |
| // collapse full->normal hinting if we're not doing LCD |
| h = SkFontHinting::kNormal; |
| } |
| |
| // rotated text looks bad with hinting, so we disable it as needed |
| if (!isAxisAligned(*rec)) { |
| h = SkFontHinting::kNone; |
| } |
| rec->setHinting(h); |
| |
| #ifndef SK_GAMMA_APPLY_TO_A8 |
| if (!isLCD(*rec)) { |
| // SRGBTODO: Is this correct? Do we want contrast boost? |
| rec->ignorePreBlend(); |
| } |
| #endif |
| } |
| |
| int SkTypeface_FreeType::GetUnitsPerEm(FT_Face face) { |
| SkASSERT(face); |
| |
| SkScalar upem = SkIntToScalar(face->units_per_EM); |
| // At least some versions of FreeType set face->units_per_EM to 0 for bitmap only fonts. |
| if (upem == 0) { |
| TT_Header* ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, ft_sfnt_head); |
| if (ttHeader) { |
| upem = SkIntToScalar(ttHeader->Units_Per_EM); |
| } |
| } |
| return upem; |
| } |
| |
| int SkTypeface_FreeType::onGetUPEM() const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return 0; |
| } |
| return GetUnitsPerEm(face); |
| } |
| |
| 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; |
| } |
| |
| /** Returns the bitmap strike equal to or just larger than the requested size. */ |
| static FT_Int chooseBitmapStrike(FT_Face face, FT_F26Dot6 scaleY) { |
| if (face == nullptr) { |
| LOG_INFO("chooseBitmapStrike aborted due to nullptr face.\n"); |
| return -1; |
| } |
| |
| FT_Pos requestedPPEM = scaleY; // FT_Bitmap_Size::y_ppem is in 26.6 format. |
| FT_Int chosenStrikeIndex = -1; |
| FT_Pos chosenPPEM = 0; |
| for (FT_Int strikeIndex = 0; strikeIndex < face->num_fixed_sizes; ++strikeIndex) { |
| FT_Pos strikePPEM = face->available_sizes[strikeIndex].y_ppem; |
| if (strikePPEM == requestedPPEM) { |
| // exact match - our search stops here |
| return strikeIndex; |
| } else if (chosenPPEM < requestedPPEM) { |
| // attempt to increase chosenPPEM |
| if (chosenPPEM < strikePPEM) { |
| chosenPPEM = strikePPEM; |
| chosenStrikeIndex = strikeIndex; |
| } |
| } else { |
| // attempt to decrease chosenPPEM, but not below requestedPPEM |
| if (requestedPPEM < strikePPEM && strikePPEM < chosenPPEM) { |
| chosenPPEM = strikePPEM; |
| chosenStrikeIndex = strikeIndex; |
| } |
| } |
| } |
| return chosenStrikeIndex; |
| } |
| |
| SkScalerContext_FreeType::SkScalerContext_FreeType(sk_sp<SkTypeface_FreeType> typeface, |
| const SkScalerContextEffects& effects, |
| const SkDescriptor* desc) |
| : SkScalerContext_FreeType_Base(std::move(typeface), effects, desc) |
| , fFace(nullptr) |
| , fFTSize(nullptr) |
| , fStrikeIndex(-1) |
| { |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| fFaceRec = static_cast<SkTypeface_FreeType*>(this->getTypeface())->getFaceRec(); |
| |
| // load the font file |
| if (nullptr == fFaceRec) { |
| LOG_INFO("Could not create FT_Face.\n"); |
| return; |
| } |
| |
| fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); |
| |
| // compute the flags we send to Load_Glyph |
| bool linearMetrics = this->isLinearMetrics(); |
| { |
| 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() == SkFontHinting::kNone) { |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| } |
| } else { |
| switch (fRec.getHinting()) { |
| case SkFontHinting::kNone: |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| break; |
| case SkFontHinting::kSlight: |
| loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| if (gFTLibrary->lightHintingIsYOnly()) { |
| linearMetrics = true; |
| } |
| break; |
| case SkFontHinting::kNormal: |
| loadFlags = FT_LOAD_TARGET_NORMAL; |
| break; |
| case SkFontHinting::kFull: |
| loadFlags = FT_LOAD_TARGET_NORMAL; |
| if (isLCD(fRec)) { |
| if (fLCDIsVert) { |
| loadFlags = FT_LOAD_TARGET_LCD_V; |
| } else { |
| loadFlags = FT_LOAD_TARGET_LCD; |
| } |
| } |
| break; |
| default: |
| LOG_INFO("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| break; |
| } |
| } |
| |
| if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { |
| loadFlags |= FT_LOAD_FORCE_AUTOHINT; |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| } else { |
| loadFlags |= FT_LOAD_NO_AUTOHINT; |
| #endif |
| } |
| |
| 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 (this->isVertical()) { |
| loadFlags |= FT_LOAD_VERTICAL_LAYOUT; |
| } |
| |
| loadFlags |= FT_LOAD_COLOR; |
| |
| fLoadGlyphFlags = loadFlags; |
| } |
| |
| using DoneFTSize = SkFunctionWrapper<decltype(FT_Done_Size), FT_Done_Size>; |
| std::unique_ptr<std::remove_pointer_t<FT_Size>, DoneFTSize> ftSize([this]() -> FT_Size { |
| FT_Size size; |
| FT_Error err = FT_New_Size(fFaceRec->fFace.get(), &size); |
| if (err != 0) { |
| SK_TRACEFTR(err, "FT_New_Size(%s) failed.", fFaceRec->fFace->family_name); |
| return nullptr; |
| } |
| return size; |
| }()); |
| if (nullptr == ftSize) { |
| LOG_INFO("Could not create FT_Size.\n"); |
| return; |
| } |
| |
| FT_Error err = FT_Activate_Size(ftSize.get()); |
| if (err != 0) { |
| SK_TRACEFTR(err, "FT_Activate_Size(%s) failed.", fFaceRec->fFace->family_name); |
| return; |
| } |
| |
| fRec.computeMatrices(SkScalerContextRec::kFull_PreMatrixScale, &fScale, &fMatrix22Scalar); |
| FT_F26Dot6 scaleX = SkScalarToFDot6(fScale.fX); |
| FT_F26Dot6 scaleY = SkScalarToFDot6(fScale.fY); |
| |
| if (FT_IS_SCALABLE(fFaceRec->fFace)) { |
| err = FT_Set_Char_Size(fFaceRec->fFace.get(), scaleX, scaleY, 72, 72); |
| if (err != 0) { |
| SK_TRACEFTR(err, "FT_Set_CharSize(%s, %f, %f) failed.", |
| fFaceRec->fFace->family_name, fScale.fX, fScale.fY); |
| return; |
| } |
| |
| // Adjust the matrix to reflect the actually chosen scale. |
| // FreeType currently does not allow requesting sizes less than 1, this allow for scaling. |
| // Don't do this at all sizes as that will interfere with hinting. |
| if (fScale.fX < 1 || fScale.fY < 1) { |
| SkScalar upem = fFaceRec->fFace->units_per_EM; |
| FT_Size_Metrics& ftmetrics = fFaceRec->fFace->size->metrics; |
| SkScalar x_ppem = upem * SkFT_FixedToScalar(ftmetrics.x_scale) / 64.0f; |
| SkScalar y_ppem = upem * SkFT_FixedToScalar(ftmetrics.y_scale) / 64.0f; |
| fMatrix22Scalar.preScale(fScale.x() / x_ppem, fScale.y() / y_ppem); |
| } |
| |
| } else if (FT_HAS_FIXED_SIZES(fFaceRec->fFace)) { |
| fStrikeIndex = chooseBitmapStrike(fFaceRec->fFace.get(), scaleY); |
| if (fStrikeIndex == -1) { |
| LOG_INFO("No glyphs for font \"%s\" size %f.\n", |
| fFaceRec->fFace->family_name, fScale.fY); |
| return; |
| } |
| |
| err = FT_Select_Size(fFaceRec->fFace.get(), fStrikeIndex); |
| if (err != 0) { |
| SK_TRACEFTR(err, "FT_Select_Size(%s, %d) failed.", |
| fFaceRec->fFace->family_name, fStrikeIndex); |
| fStrikeIndex = -1; |
| return; |
| } |
| |
| // Adjust the matrix to reflect the actually chosen scale. |
| // It is likely that the ppem chosen was not the one requested, this allows for scaling. |
| fMatrix22Scalar.preScale(fScale.x() / fFaceRec->fFace->size->metrics.x_ppem, |
| fScale.y() / fFaceRec->fFace->size->metrics.y_ppem); |
| |
| // FreeType does not 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 { |
| LOG_INFO("Unknown kind of font \"%s\" size %f.\n", fFaceRec->fFace->family_name, fScale.fY); |
| return; |
| } |
| |
| fMatrix22.xx = SkScalarToFixed(fMatrix22Scalar.getScaleX()); |
| fMatrix22.xy = SkScalarToFixed(-fMatrix22Scalar.getSkewX()); |
| fMatrix22.yx = SkScalarToFixed(-fMatrix22Scalar.getSkewY()); |
| fMatrix22.yy = SkScalarToFixed(fMatrix22Scalar.getScaleY()); |
| |
| #ifdef FT_COLOR_H |
| FT_Palette_Select(fFaceRec->fFace.get(), 0, nullptr); |
| #endif |
| |
| fFTSize = ftSize.release(); |
| fFace = fFaceRec->fFace.get(); |
| fDoLinearMetrics = linearMetrics; |
| } |
| |
| SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| if (fFTSize != nullptr) { |
| FT_Done_Size(fFTSize); |
| } |
| |
| fFaceRec = nullptr; |
| } |
| |
| /* 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() { |
| f_t_mutex().assertHeld(); |
| FT_Error err = FT_Activate_Size(fFTSize); |
| if (err != 0) { |
| return err; |
| } |
| FT_Set_Transform(fFace, &fMatrix22, nullptr); |
| return 0; |
| } |
| |
| bool 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) { |
| return false; |
| } |
| |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| if (this->setupSize()) { |
| glyph->zeroMetrics(); |
| return true; |
| } |
| |
| FT_Error error; |
| FT_Fixed advance; |
| |
| error = FT_Get_Advance( fFace, glyph->getGlyphID(), |
| fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| &advance ); |
| |
| if (error != 0) { |
| return false; |
| } |
| |
| const SkScalar advanceScalar = SkFT_FixedToScalar(advance); |
| glyph->fAdvanceX = SkScalarToFloat(fMatrix22Scalar.getScaleX() * advanceScalar); |
| glyph->fAdvanceY = SkScalarToFloat(fMatrix22Scalar.getSkewY() * advanceScalar); |
| return true; |
| } |
| |
| void SkScalerContext_FreeType::getBBoxForCurrentGlyph(const SkGlyph* glyph, |
| FT_BBox* bbox, |
| bool snapToPixelBoundary) { |
| |
| FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| |
| if (this->isSubpixel()) { |
| 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 (this->isVertical()) { |
| 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, SkTo<SkGlyphID>(glyph_id)); |
| FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| return true; |
| } |
| |
| void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { |
| if (glyph->fMaskFormat == SkMask::kLCD16_Format) { |
| if (fLCDIsVert) { |
| glyph->fHeight += gFTLibrary->lcdExtra(); |
| glyph->fTop -= gFTLibrary->lcdExtra() >> 1; |
| } else { |
| glyph->fWidth += gFTLibrary->lcdExtra(); |
| glyph->fLeft -= gFTLibrary->lcdExtra() >> 1; |
| } |
| } |
| } |
| |
| bool SkScalerContext_FreeType::shouldSubpixelBitmap(const SkGlyph& glyph, const SkMatrix& matrix) { |
| // If subpixel rendering of a bitmap *can* be done. |
| bool mechanism = fFace->glyph->format == FT_GLYPH_FORMAT_BITMAP && |
| this->isSubpixel() && |
| (glyph.getSubXFixed() || glyph.getSubYFixed()); |
| |
| // If subpixel rendering of a bitmap *should* be done. |
| // 1. If the face is not scalable then always allow subpixel rendering. |
| // Otherwise, if the font has an 8ppem strike 7 will subpixel render but 8 won't. |
| // 2. If the matrix is already not identity the bitmap will already be resampled, |
| // so resampling slightly differently shouldn't make much difference. |
| bool policy = !FT_IS_SCALABLE(fFace) || !matrix.isIdentity(); |
| |
| return mechanism && policy; |
| } |
| |
| void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| glyph->fMaskFormat = fRec.fMaskFormat; |
| |
| if (this->setupSize()) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| FT_Error err; |
| err = FT_Load_Glyph( fFace, glyph->getGlyphID(), |
| fLoadGlyphFlags | FT_LOAD_BITMAP_METRICS_ONLY ); |
| if (err != 0) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph, glyph->getGlyphID()); |
| |
| if (fFace->glyph->format == FT_GLYPH_FORMAT_OUTLINE) { |
| using FT_PosLimits = std::numeric_limits<FT_Pos>; |
| FT_BBox bounds = { FT_PosLimits::max(), FT_PosLimits::max(), |
| FT_PosLimits::min(), FT_PosLimits::min() }; |
| #ifdef FT_COLOR_H |
| FT_Bool haveLayers = false; |
| FT_LayerIterator layerIterator = { 0, 0, nullptr }; |
| FT_UInt layerGlyphIndex; |
| FT_UInt layerColorIndex; |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| FT_OpaquePaint opaqueLayerPaint; |
| opaqueLayerPaint.p = nullptr; |
| if (FT_Get_Color_Glyph_Paint(fFace, glyph->getGlyphID(), |
| FT_COLOR_INCLUDE_ROOT_TRANSFORM, &opaqueLayerPaint)) { |
| haveLayers = true; |
| |
| // COLRv1 glyphs define a placeholder glyph in the glyf table that |
| // defines the extrema of the glyph. If this placeholder glyph |
| // contains only two points and FreeType applies the transform first - |
| // as configured by setupSize() - then we get a transformed bounding |
| // box that is too small as it only needs to fit the two points. To |
| // fix that, create a temporary contour consisting of all four corners |
| // of an imaginary rectangle enclosing those two points, then |
| // transform that and perform the bounding box computations on this |
| // one. |
| |
| FT_Set_Transform(fFace, nullptr, nullptr); |
| |
| err = FT_Load_Glyph(fFace, glyph->getGlyphID(), |
| fLoadGlyphFlags | FT_LOAD_BITMAP_METRICS_ONLY); |
| if (err != 0 || fFace->glyph->outline.n_contours == 0) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph, glyph->getGlyphID()); |
| |
| FT_BBox bbox_untransformed; |
| FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox_untransformed); |
| |
| FT_Outline bboxOutline; |
| err = FT_Outline_New(gFTLibrary->library(), 4, 0, &bboxOutline); |
| if (err != 0) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| // Compose a rectangle contour by setting the four corners. |
| bboxOutline.points[0].x = bbox_untransformed.xMin; |
| bboxOutline.points[0].y = bbox_untransformed.yMin; |
| |
| bboxOutline.points[1].x = bbox_untransformed.xMin; |
| bboxOutline.points[1].y = bbox_untransformed.yMax; |
| |
| bboxOutline.points[2].x = bbox_untransformed.xMax; |
| bboxOutline.points[2].y = bbox_untransformed.yMax; |
| |
| bboxOutline.points[3].x = bbox_untransformed.xMax; |
| bboxOutline.points[3].y = bbox_untransformed.yMin; |
| |
| FT_Outline_Transform(&bboxOutline, &fMatrix22); |
| |
| FT_Outline faceOutline = fFace->glyph->outline; |
| fFace->glyph->outline = bboxOutline; |
| // Retrieve from temporarily replaced transformed rectangle outline. |
| getBBoxForCurrentGlyph(glyph, &bounds, true); |
| fFace->glyph->outline = faceOutline; |
| FT_Outline_Done(gFTLibrary->library(), &bboxOutline); |
| |
| } |
| #endif // #TT_SUPPORT_COLRV1 |
| |
| if (!haveLayers) { |
| // For COLRv0 compute the glyph bounding box from the union of layer bounding boxes. |
| while (FT_Get_Color_Glyph_Layer(fFace, glyph->getGlyphID(), &layerGlyphIndex, |
| &layerColorIndex, &layerIterator)) { |
| haveLayers = true; |
| err = FT_Load_Glyph(fFace, layerGlyphIndex, |
| fLoadGlyphFlags | FT_LOAD_BITMAP_METRICS_ONLY); |
| if (err != 0) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph, layerGlyphIndex); |
| |
| if (0 < fFace->glyph->outline.n_contours) { |
| FT_BBox bbox; |
| getBBoxForCurrentGlyph(glyph, &bbox, true); |
| |
| // Union |
| bounds.xMin = std::min(bbox.xMin, bounds.xMin); |
| bounds.yMin = std::min(bbox.yMin, bounds.yMin); |
| bounds.xMax = std::max(bbox.xMax, bounds.xMax); |
| bounds.yMax = std::max(bbox.yMax, bounds.yMax); |
| } |
| } |
| } |
| |
| if (haveLayers) { |
| glyph->fMaskFormat = SkMask::kARGB32_Format; |
| if (!(bounds.xMin < bounds.xMax && bounds.yMin < bounds.yMax)) { |
| bounds = { 0, 0, 0, 0 }; |
| } |
| } else { |
| #endif |
| if (0 < fFace->glyph->outline.n_contours) { |
| getBBoxForCurrentGlyph(glyph, &bounds, true); |
| } else { |
| bounds = { 0, 0, 0, 0 }; |
| } |
| #ifdef FT_COLOR_H |
| } |
| #endif |
| // Round out, no longer dot6. |
| bounds.xMin = SkFDot6Floor(bounds.xMin); |
| bounds.yMin = SkFDot6Floor(bounds.yMin); |
| bounds.xMax = SkFDot6Ceil (bounds.xMax); |
| bounds.yMax = SkFDot6Ceil (bounds.yMax); |
| |
| FT_Pos width = bounds.xMax - bounds.xMin; |
| FT_Pos height = bounds.yMax - bounds.yMin; |
| FT_Pos top = -bounds.yMax; // Freetype y-up, Skia y-down. |
| FT_Pos left = bounds.xMin; |
| if (!SkTFitsIn<decltype(glyph->fWidth )>(width ) || |
| !SkTFitsIn<decltype(glyph->fHeight)>(height) || |
| !SkTFitsIn<decltype(glyph->fTop )>(top ) || |
| !SkTFitsIn<decltype(glyph->fLeft )>(left ) ) |
| { |
| width = height = top = left = 0; |
| } |
| |
| glyph->fWidth = SkToU16(width ); |
| glyph->fHeight = SkToU16(height); |
| glyph->fTop = SkToS16(top ); |
| glyph->fLeft = SkToS16(left ); |
| updateGlyphIfLCD(glyph); |
| |
| } else if (fFace->glyph->format == FT_GLYPH_FORMAT_BITMAP) { |
| if (this->isVertical()) { |
| 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; |
| } |
| |
| { |
| SkRect rect = SkRect::MakeXYWH(SkIntToScalar(fFace->glyph->bitmap_left), |
| -SkIntToScalar(fFace->glyph->bitmap_top), |
| SkIntToScalar(fFace->glyph->bitmap.width), |
| SkIntToScalar(fFace->glyph->bitmap.rows)); |
| fMatrix22Scalar.mapRect(&rect); |
| if (this->shouldSubpixelBitmap(*glyph, fMatrix22Scalar)) { |
| rect.offset(SkFixedToScalar(glyph->getSubXFixed()), |
| SkFixedToScalar(glyph->getSubYFixed())); |
| } |
| SkIRect irect = rect.roundOut(); |
| glyph->fWidth = SkToU16(irect.width()); |
| glyph->fHeight = SkToU16(irect.height()); |
| glyph->fTop = SkToS16(irect.top()); |
| glyph->fLeft = SkToS16(irect.left()); |
| } |
| } else { |
| SkDEBUGFAIL("unknown glyph format"); |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| if (this->isVertical()) { |
| if (fDoLinearMetrics) { |
| const SkScalar advanceScalar = SkFT_FixedToScalar(fFace->glyph->linearVertAdvance); |
| glyph->fAdvanceX = SkScalarToFloat(fMatrix22Scalar.getSkewX() * advanceScalar); |
| glyph->fAdvanceY = SkScalarToFloat(fMatrix22Scalar.getScaleY() * advanceScalar); |
| } else { |
| glyph->fAdvanceX = -SkFDot6ToFloat(fFace->glyph->advance.x); |
| glyph->fAdvanceY = SkFDot6ToFloat(fFace->glyph->advance.y); |
| } |
| } else { |
| if (fDoLinearMetrics) { |
| const SkScalar advanceScalar = SkFT_FixedToScalar(fFace->glyph->linearHoriAdvance); |
| glyph->fAdvanceX = SkScalarToFloat(fMatrix22Scalar.getScaleX() * advanceScalar); |
| glyph->fAdvanceY = SkScalarToFloat(fMatrix22Scalar.getSkewY() * advanceScalar); |
| } else { |
| glyph->fAdvanceX = SkFDot6ToFloat(fFace->glyph->advance.x); |
| glyph->fAdvanceY = -SkFDot6ToFloat(fFace->glyph->advance.y); |
| } |
| } |
| |
| #ifdef ENABLE_GLYPH_SPEW |
| LOG_INFO("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(), fLoadGlyphFlags, glyph->fWidth); |
| #endif |
| } |
| |
| void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| if (this->setupSize()) { |
| sk_bzero(glyph.fImage, glyph.imageSize()); |
| return; |
| } |
| |
| FT_Error err = FT_Load_Glyph(fFace, glyph.getGlyphID(), fLoadGlyphFlags); |
| if (err != 0) { |
| SK_TRACEFTR(err, "SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d " |
| "width:%d height:%d rb:%d flags:%d) failed.", |
| glyph.getGlyphID(), glyph.width(), glyph.height(), glyph.rowBytes(), |
| fLoadGlyphFlags); |
| sk_bzero(glyph.fImage, glyph.imageSize()); |
| return; |
| } |
| |
| emboldenIfNeeded(fFace, fFace->glyph, glyph.getGlyphID()); |
| SkMatrix* bitmapMatrix = &fMatrix22Scalar; |
| SkMatrix subpixelBitmapMatrix; |
| if (this->shouldSubpixelBitmap(glyph, *bitmapMatrix)) { |
| subpixelBitmapMatrix = fMatrix22Scalar; |
| subpixelBitmapMatrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()), |
| SkFixedToScalar(glyph.getSubYFixed())); |
| bitmapMatrix = &subpixelBitmapMatrix; |
| } |
| generateGlyphImage(fFace, glyph, *bitmapMatrix); |
| } |
| |
| |
| bool SkScalerContext_FreeType::generatePath(SkGlyphID glyphID, SkPath* path) { |
| SkASSERT(path); |
| |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| // FT_IS_SCALABLE is documented to mean the face contains outline glyphs. |
| if (!FT_IS_SCALABLE(fFace) || this->setupSize()) { |
| path->reset(); |
| return false; |
| } |
| |
| 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, glyphID, flags); |
| if (err != 0 || fFace->glyph->format != FT_GLYPH_FORMAT_OUTLINE) { |
| path->reset(); |
| return false; |
| } |
| emboldenIfNeeded(fFace, fFace->glyph, glyphID); |
| |
| if (!generateGlyphPath(fFace, path)) { |
| path->reset(); |
| return false; |
| } |
| |
| // 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 (this->isVertical()) { |
| 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)); |
| } |
| return true; |
| } |
| |
| void SkScalerContext_FreeType::generateFontMetrics(SkFontMetrics* metrics) { |
| if (nullptr == metrics) { |
| return; |
| } |
| |
| SkAutoMutexExclusive ac(f_t_mutex()); |
| |
| if (this->setupSize()) { |
| sk_bzero(metrics, sizeof(*metrics)); |
| return; |
| } |
| |
| FT_Face face = fFace; |
| metrics->fFlags = 0; |
| |
| SkScalar upem = SkIntToScalar(SkTypeface_FreeType::GetUnitsPerEm(face)); |
| |
| // 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; |
| SkScalar strikeoutThickness = 0.0f, strikeoutPosition = 0.0f; |
| TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| if (os2) { |
| x_height = SkIntToScalar(os2->sxHeight) / upem * fScale.y(); |
| avgCharWidth = SkIntToScalar(os2->xAvgCharWidth) / upem; |
| strikeoutThickness = SkIntToScalar(os2->yStrikeoutSize) / upem; |
| strikeoutPosition = -SkIntToScalar(os2->yStrikeoutPosition) / upem; |
| metrics->fFlags |= SkFontMetrics::kStrikeoutThicknessIsValid_Flag; |
| metrics->fFlags |= SkFontMetrics::kStrikeoutPositionIsValid_Flag; |
| if (os2->version != 0xFFFF && os2->version >= 2) { |
| cap_height = SkIntToScalar(os2->sCapHeight) / upem * fScale.y(); |
| } |
| } |
| |
| // 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 |= SkFontMetrics::kUnderlineThicknessIsValid_Flag; |
| metrics->fFlags |= SkFontMetrics::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; |
| ymax = ascent; |
| // The actual bitmaps may be any size and placed at any offset. |
| metrics->fFlags |= SkFontMetrics::kBoundsInvalid_Flag; |
| |
| underlineThickness = 0; |
| underlinePosition = 0; |
| metrics->fFlags &= ~SkFontMetrics::kUnderlineThicknessIsValid_Flag; |
| metrics->fFlags &= ~SkFontMetrics::kUnderlinePositionIsValid_Flag; |
| |
| TT_Postscript* post = (TT_Postscript*) FT_Get_Sfnt_Table(face, ft_sfnt_post); |
| if (post) { |
| underlineThickness = SkIntToScalar(post->underlineThickness) / upem; |
| underlinePosition = -SkIntToScalar(post->underlinePosition) / upem; |
| metrics->fFlags |= SkFontMetrics::kUnderlineThicknessIsValid_Flag; |
| metrics->fFlags |= SkFontMetrics::kUnderlinePositionIsValid_Flag; |
| } |
| } else { |
| sk_bzero(metrics, sizeof(*metrics)); |
| return; |
| } |
| |
| // synthesize elements that were not provided by the os/2 table or format-specific metrics |
| if (!x_height) { |
| x_height = -ascent * fScale.y(); |
| } |
| if (!avgCharWidth) { |
| avgCharWidth = xmax - xmin; |
| } |
| if (!cap_height) { |
| cap_height = -ascent * fScale.y(); |
| } |
| |
| // disallow negative linespacing |
| if (leading < 0.0f) { |
| leading = 0.0f; |
| } |
| |
| metrics->fTop = ymax * fScale.y(); |
| metrics->fAscent = ascent * fScale.y(); |
| metrics->fDescent = descent * fScale.y(); |
| metrics->fBottom = ymin * fScale.y(); |
| metrics->fLeading = leading * fScale.y(); |
| metrics->fAvgCharWidth = avgCharWidth * fScale.y(); |
| metrics->fXMin = xmin * fScale.y(); |
| metrics->fXMax = xmax * fScale.y(); |
| metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin; |
| metrics->fXHeight = x_height; |
| metrics->fCapHeight = cap_height; |
| metrics->fUnderlineThickness = underlineThickness * fScale.y(); |
| metrics->fUnderlinePosition = underlinePosition * fScale.y(); |
| metrics->fStrikeoutThickness = strikeoutThickness * fScale.y(); |
| metrics->fStrikeoutPosition = strikeoutPosition * fScale.y(); |
| |
| if (face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) { |
| // The bounds are only valid for the default variation. |
| metrics->fFlags |= SkFontMetrics::kBoundsInvalid_Flag; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // 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, SkGlyphID gid) { |
| // 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: |
| if (!fFace->glyph->bitmap.buffer) { |
| FT_Load_Glyph(fFace, gid, fLoadGlyphFlags); |
| } |
| FT_GlyphSlot_Own_Bitmap(glyph); |
| FT_Bitmap_Embolden(glyph->library, &glyph->bitmap, kBitmapEmboldenStrength, 0); |
| break; |
| default: |
| SkDEBUGFAIL("unknown glyph format"); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "src/core/SkUtils.h" |
| |
| SkTypeface_FreeType::SkTypeface_FreeType(const SkFontStyle& style, bool isFixedPitch) |
| : INHERITED(style, isFixedPitch) |
| {} |
| |
| SkTypeface_FreeType::~SkTypeface_FreeType() {} |
| |
| // Just made up, so we don't end up storing 1000s of entries |
| constexpr int kMaxC2GCacheCount = 512; |
| |
| void SkTypeface_FreeType::onCharsToGlyphs(const SkUnichar uni[], int count, |
| SkGlyphID glyphs[]) const { |
| // Try the cache first, *before* accessing freetype lib/face, as that |
| // can be very slow. If we do need to compute a new glyphID, then |
| // access those freetype objects and continue the loop. |
| |
| int i; |
| { |
| // Optimistically use a shared lock. |
| SkAutoSharedMutexShared ama(fC2GCacheMutex); |
| for (i = 0; i < count; ++i) { |
| int index = fC2GCache.findGlyphIndex(uni[i]); |
| if (index < 0) { |
| break; |
| } |
| glyphs[i] = SkToU16(index); |
| } |
| if (i == count) { |
| // we're done, no need to access the freetype objects |
| return; |
| } |
| } |
| |
| // Need to add more so grab an exclusive lock. |
| SkAutoSharedMutexExclusive ama(fC2GCacheMutex); |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| sk_bzero(glyphs, count * sizeof(glyphs[0])); |
| return; |
| } |
| |
| for (; i < count; ++i) { |
| SkUnichar c = uni[i]; |
| int index = fC2GCache.findGlyphIndex(c); |
| if (index >= 0) { |
| glyphs[i] = SkToU16(index); |
| } else { |
| glyphs[i] = SkToU16(FT_Get_Char_Index(face, c)); |
| fC2GCache.insertCharAndGlyph(~index, c, glyphs[i]); |
| } |
| } |
| |
| if (fC2GCache.count() > kMaxC2GCacheCount) { |
| fC2GCache.reset(); |
| } |
| } |
| |
| int SkTypeface_FreeType::onCountGlyphs() const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| return face ? face->num_glyphs : 0; |
| } |
| |
| SkTypeface::LocalizedStrings* SkTypeface_FreeType::onCreateFamilyNameIterator() const { |
| sk_sp<SkTypeface::LocalizedStrings> nameIter = |
| SkOTUtils::LocalizedStrings_NameTable::MakeForFamilyNames(*this); |
| if (!nameIter) { |
| SkString familyName; |
| this->getFamilyName(&familyName); |
| SkString language("und"); //undetermined |
| nameIter = sk_make_sp<SkOTUtils::LocalizedStrings_SingleName>(familyName, language); |
| } |
| return nameIter.release(); |
| } |
| |
| int SkTypeface_FreeType::onGetVariationDesignPosition( |
| SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const |
| { |
| AutoFTAccess fta(this); |
| return GetVariationDesignPosition(fta, coordinates, coordinateCount); |
| } |
| |
| int SkTypeface_FreeType::onGetVariationDesignParameters( |
| SkFontParameters::Variation::Axis parameters[], int parameterCount) const |
| { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return -1; |
| } |
| |
| if (!(face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) { |
| return 0; |
| } |
| |
| FT_MM_Var* variations = nullptr; |
| if (FT_Get_MM_Var(face, &variations)) { |
| return -1; |
| } |
| SkAutoFree autoFreeVariations(variations); |
| |
| if (!parameters || parameterCount < SkToInt(variations->num_axis)) { |
| return variations->num_axis; |
| } |
| |
| for (FT_UInt i = 0; i < variations->num_axis; ++i) { |
| parameters[i].tag = variations->axis[i].tag; |
| parameters[i].min = SkFixedToScalar(variations->axis[i].minimum); |
| parameters[i].def = SkFixedToScalar(variations->axis[i].def); |
| parameters[i].max = SkFixedToScalar(variations->axis[i].maximum); |
| FT_UInt flags = 0; |
| bool hidden = gFTLibrary->fGetVarAxisFlags && |
| !gFTLibrary->fGetVarAxisFlags(variations, i, &flags) && |
| (flags & FT_VAR_AXIS_FLAG_HIDDEN); |
| parameters[i].setHidden(hidden); |
| } |
| |
| return variations->num_axis; |
| } |
| |
| int SkTypeface_FreeType::onGetTableTags(SkFontTableTag tags[]) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return 0; |
| } |
| |
| 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(); |
| if (!face) { |
| return 0; |
| } |
| |
| 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 = std::min((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; |
| } |
| |
| sk_sp<SkData> SkTypeface_FreeType::onCopyTableData(SkFontTableTag tag) const { |
| AutoFTAccess fta(this); |
| FT_Face face = fta.face(); |
| if (!face) { |
| return nullptr; |
| } |
| |
| 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 nullptr; |
| } |
| |
| sk_sp<SkData> data = SkData::MakeUninitialized(tableLength); |
| if (data) { |
| error = FT_Load_Sfnt_Table(face, tag, 0, |
| reinterpret_cast<FT_Byte*>(data->writable_data()), &tableLength); |
| if (error) { |
| data.reset(); |
| } |
| } |
| return data; |
| } |
| |
| SkTypeface_FreeType::FaceRec* SkTypeface_FreeType::getFaceRec() const { |
| f_t_mutex().assertHeld(); |
| fFTFaceOnce([this]{ fFaceRec = SkTypeface_FreeType::FaceRec::Make(this); }); |
| return fFaceRec.get(); |
| } |
| |
| std::unique_ptr<SkFontData> SkTypeface_FreeType::makeFontData() const { |
| return this->onMakeFontData(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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(SkStreamAsset* stream, int ttcIndex, |
| FT_Stream ftStream) const |
| { |
| if (fLibrary == nullptr || stream == 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(SkStreamAsset* stream, int* numFaces) const { |
| SkAutoMutexExclusive libraryLock(fLibraryMutex); |
| |
| FT_StreamRec streamRec; |
| SkUniqueFTFace face(this->openFace(stream, -1, &streamRec)); |
| if (!face) { |
| return false; |
| } |
| |
| *numFaces = face->num_faces; |
| return true; |
| } |
| |
| #include "src/core/SkTSearch.h" |
| bool SkTypeface_FreeType::Scanner::scanFont( |
| SkStreamAsset* stream, int ttcIndex, |
| SkString* name, SkFontStyle* style, bool* isFixedPitch, AxisDefinitions* axes) const |
| { |
| SkAutoMutexExclusive libraryLock(fLibraryMutex); |
| |
| FT_StreamRec streamRec; |
| SkUniqueFTFace face(this->openFace(stream, ttcIndex, &streamRec)); |
| if (!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.get(), ft_sfnt_os2)); |
| if (os2 && os2->version != 0xffff) { |
| weight = os2->usWeightClass; |
| width = os2->usWidthClass; |
| |
| // OS/2::fsSelection bit 9 indicates oblique. |
| if (SkToBool(os2->fsSelection & (1u << 9))) { |
| slant = SkFontStyle::kOblique_Slant; |
| } |
| } else if (0 == FT_Get_PS_Font_Info(face.get(), &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", SkFontStyle::kExtraBlack_Weight }, |
| { "ultrabold", SkFontStyle::kExtraBold_Weight }, |
| { "ultraheavy", SkFontStyle::kExtraBlack_Weight }, |
| { "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 { |
| LOG_INFO("Do not know weight for: %s (%s) \n", face->family_name, psFontInfo.weight); |
| } |
| } |
| |
| if (name != nullptr) { |
| name->set(face->family_name); |
| } |
| if (style != nullptr) { |
| *style = SkFontStyle(weight, width, slant); |
| } |
| if (isFixedPitch != nullptr) { |
| *isFixedPitch = FT_IS_FIXED_WIDTH(face); |
| } |
| |
| if (axes != nullptr && !GetAxes(face.get(), axes)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool SkTypeface_FreeType::Scanner::GetAxes(FT_Face face, AxisDefinitions* axes) { |
| SkASSERT(face && axes); |
| if (face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) { |
| FT_MM_Var* variations = nullptr; |
| FT_Error err = FT_Get_MM_Var(face, &variations); |
| if (err) { |
| LOG_INFO("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; |
| } |
| } |
| return true; |
| } |
| |
| /*static*/ void SkTypeface_FreeType::Scanner::computeAxisValues( |
| AxisDefinitions axisDefinitions, |
| const SkFontArguments::VariationPosition position, |
| SkFixed* axisValues, |
| const SkString& name, |
| const SkFontArguments::VariationPosition::Coordinate* current) |
| { |
| 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); |
| |
| // Start with the default value. |
| axisValues[i] = axisDefinition.fDefault; |
| |
| // Then the current value. |
| if (current) { |
| for (int j = 0; j < axisDefinitions.count(); ++j) { |
| const auto& coordinate = current[j]; |
| if (axisDefinition.fTag == coordinate.axis) { |
| const SkScalar axisValue = SkTPin(coordinate.value, axisMin, axisMax); |
| axisValues[i] = SkScalarToFixed(axisValue); |
| break; |
| } |
| } |
| } |
| |
| // Then the requested value. |
| // The position may be over specified. If there are multiple values for a given axis, |
| // use the last one since that's what css-fonts-4 requires. |
| for (int j = position.coordinateCount; j --> 0;) { |
| const auto& coordinate = position.coordinates[j]; |
| if (axisDefinition.fTag == coordinate.axis) { |
| const SkScalar axisValue = SkTPin(coordinate.value, axisMin, axisMax); |
| if (coordinate.value != axisValue) { |
| LOG_INFO("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(coordinate.value), |
| 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 < position.coordinateCount; ++i) { |
| SkFourByteTag skTag = position.coordinates[i].axis; |
| bool found = false; |
| for (int j = 0; j < axisDefinitions.count(); ++j) { |
| if (skTag == axisDefinitions[j].fTag) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) { |
| LOG_INFO("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); |
| } |
| } |
| ) |
| } |