| /* |
| * Copyright 2006-2012 The Android Open Source Project |
| * Copyright 2012 Mozilla Foundation |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SKFONTHOST_FREETYPE_COMMON_H_ |
| #define SKFONTHOST_FREETYPE_COMMON_H_ |
| |
| #include "include/core/SkTypeface.h" |
| #include "include/core/SkTypes.h" |
| #include "src/core/SkGlyph.h" |
| #include "src/core/SkScalerContext.h" |
| #include "src/core/SkSharedMutex.h" |
| #include "src/utils/SkCharToGlyphCache.h" |
| |
| #include "include/core/SkFontMgr.h" |
| |
| // These are forward declared to avoid pimpl but also hide the FreeType implementation. |
| typedef struct FT_LibraryRec_* FT_Library; |
| typedef struct FT_FaceRec_* FT_Face; |
| typedef struct FT_StreamRec_* FT_Stream; |
| typedef signed long FT_Pos; |
| |
| #ifdef SK_DEBUG |
| const char* SkTraceFtrGetError(int); |
| #define SK_TRACEFTR(ERR, MSG, ...) \ |
| SkDebugf("%s:%lu:1: error: 0x%x '%s' " MSG "\n", __FILE__, __LINE__, ERR, \ |
| SkTraceFtrGetError((int)(ERR)), __VA_ARGS__) |
| #else |
| #define SK_TRACEFTR(ERR, ...) do { sk_ignore_unused_variable(ERR); } while (false) |
| #endif |
| |
| |
| class SkScalerContext_FreeType_Base : public SkScalerContext { |
| protected: |
| // See http://freetype.sourceforge.net/freetype2/docs/reference/ft2-bitmap_handling.html#FT_Bitmap_Embolden |
| // This value was chosen by eyeballing the result in Firefox and trying to match it. |
| static const FT_Pos kBitmapEmboldenStrength = 1 << 6; |
| |
| SkScalerContext_FreeType_Base(sk_sp<SkTypeface> typeface, const SkScalerContextEffects& effects, |
| const SkDescriptor *desc) |
| : INHERITED(std::move(typeface), effects, desc) |
| {} |
| |
| void generateGlyphImage(FT_Face face, const SkGlyph& glyph, const SkMatrix& bitmapTransform); |
| bool generateGlyphPath(FT_Face face, SkPath* path); |
| bool generateFacePath(FT_Face face, SkGlyphID glyphID, SkPath* path); |
| private: |
| using INHERITED = SkScalerContext; |
| }; |
| |
| class SkTypeface_FreeType : public SkTypeface { |
| public: |
| /** For SkFontMgrs to make use of our ability to extract |
| * name and style from a stream, using FreeType's API. |
| */ |
| class Scanner : ::SkNoncopyable { |
| public: |
| Scanner(); |
| ~Scanner(); |
| struct AxisDefinition { |
| SkFourByteTag fTag; |
| SkFixed fMinimum; |
| SkFixed fDefault; |
| SkFixed fMaximum; |
| }; |
| using AxisDefinitions = SkSTArray<4, AxisDefinition, true>; |
| bool recognizedFont(SkStreamAsset* stream, int* numFonts) const; |
| bool scanFont(SkStreamAsset* stream, int ttcIndex, |
| SkString* name, SkFontStyle* style, bool* isFixedPitch, |
| AxisDefinitions* axes) const; |
| static void computeAxisValues( |
| AxisDefinitions axisDefinitions, |
| const SkFontArguments::VariationPosition position, |
| SkFixed* axisValues, |
| const SkString& name, |
| const SkFontArguments::VariationPosition::Coordinate* currentPosition = nullptr); |
| static bool GetAxes(FT_Face face, AxisDefinitions* axes); |
| |
| private: |
| FT_Face openFace(SkStreamAsset* stream, int ttcIndex, FT_Stream ftStream) const; |
| FT_Library fLibrary; |
| mutable SkMutex fLibraryMutex; |
| }; |
| |
| /** Fetch units/EM from "head" table if needed (ie for bitmap fonts) */ |
| static int GetUnitsPerEm(FT_Face face); |
| |
| /** |
| * Return the font data, or nullptr on failure. |
| */ |
| std::unique_ptr<SkFontData> makeFontData() const; |
| class FaceRec; |
| FaceRec* getFaceRec() const; |
| |
| protected: |
| SkTypeface_FreeType(const SkFontStyle& style, bool isFixedPitch); |
| ~SkTypeface_FreeType() override; |
| |
| std::unique_ptr<SkFontData> cloneFontData(const SkFontArguments&) const; |
| std::unique_ptr<SkScalerContext> onCreateScalerContext(const SkScalerContextEffects&, |
| const SkDescriptor*) const override; |
| void onFilterRec(SkScalerContextRec*) const override; |
| void getGlyphToUnicodeMap(SkUnichar*) const override; |
| std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override; |
| void getPostScriptGlyphNames(SkString* dstArray) const override; |
| bool onGetPostScriptName(SkString*) const override; |
| int onGetUPEM() const override; |
| bool onGetKerningPairAdjustments(const uint16_t glyphs[], int count, |
| int32_t adjustments[]) const override; |
| void onCharsToGlyphs(const SkUnichar uni[], int count, SkGlyphID glyphs[]) const override; |
| int onCountGlyphs() const override; |
| |
| LocalizedStrings* onCreateFamilyNameIterator() const override; |
| |
| int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[], |
| int coordinateCount) const override; |
| int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[], |
| int parameterCount) const override; |
| int onGetTableTags(SkFontTableTag tags[]) const override; |
| size_t onGetTableData(SkFontTableTag, size_t offset, |
| size_t length, void* data) const override; |
| sk_sp<SkData> onCopyTableData(SkFontTableTag) const override; |
| |
| virtual std::unique_ptr<SkFontData> onMakeFontData() const = 0; |
| |
| private: |
| mutable SkOnce fFTFaceOnce; |
| mutable std::unique_ptr<FaceRec> fFaceRec; |
| |
| mutable SkSharedMutex fC2GCacheMutex; |
| mutable SkCharToGlyphCache fC2GCache; |
| |
| using INHERITED = SkTypeface; |
| }; |
| |
| #endif // SKFONTHOST_FREETYPE_COMMON_H_ |