/* * Copyright 2013 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef SkFontMgr_DEFINED #define SkFontMgr_DEFINED #include "SkFontStyle.h" #include "SkRefCnt.h" #include "SkScalar.h" #include "SkTypes.h" class SkData; class SkFontData; class SkStreamAsset; class SkString; class SkTypeface; class SK_API SkFontStyleSet : public SkRefCnt { public: virtual int count() = 0; virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0; virtual SkTypeface* createTypeface(int index) = 0; virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0; static SkFontStyleSet* CreateEmpty(); protected: SkTypeface* matchStyleCSS3(const SkFontStyle& pattern); private: typedef SkRefCnt INHERITED; }; class SK_API SkFontMgr : public SkRefCnt { public: int countFamilies() const; void getFamilyName(int index, SkString* familyName) const; SkFontStyleSet* createStyleSet(int index) const; /** * The caller must call unref() on the returned object. * Never returns NULL; will return an empty set if the name is not found. * * Passing |nullptr| as the parameter will return the default system font. * * It is possible that this will return a style set not accessible from * createStyleSet(int) due to hidden or auto-activated fonts. */ SkFontStyleSet* matchFamily(const char familyName[]) const; /** * Find the closest matching typeface to the specified familyName and style * and return a ref to it. The caller must call unref() on the returned * object. Will never return NULL, as it will return the default font if * no matching font is found. * * Passing |nullptr| as the parameter for |familyName| will return the * default system font. * * It is possible that this will return a style set not accessible from * createStyleSet(int) or matchFamily(const char[]) due to hidden or * auto-activated fonts. */ SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const; /** * Use the system fallback to find a typeface for the given character. * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes, * so it is fine to just pass a ISO 639 here. * * Will return NULL if no family can be found for the character * in the system fallback. * * Passing |nullptr| as the parameter for |familyName| will return the * default system font. * * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the * most significant. If no specified bcp47 codes match, any font with the * requested character will be matched. */ SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, const char* bcp47[], int bcp47Count, SkUnichar character) const; SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) const; /** * Create a typeface for the specified data and TTC index (pass 0 for none) * or NULL if the data is not recognized. The caller must call unref() on * the returned object if it is not null. */ SkTypeface* createFromData(SkData*, int ttcIndex = 0) const; /** * Create a typeface for the specified stream and TTC index * (pass 0 for none) or NULL if the stream is not recognized. The caller * must call unref() on the returned object if it is not null. */ SkTypeface* createFromStream(SkStreamAsset*, int ttcIndex = 0) const; struct FontParameters { struct Axis { SkFourByteTag fTag; SkScalar fStyleValue; }; FontParameters() : fCollectionIndex(0), fAxisCount(0), fAxes(nullptr) {} /** Specify the index of the desired font. * * Font formats like ttc, dfont, cff, cid, pfr, t42, t1, and fon may actually be indexed * collections of fonts. */ FontParameters& setCollectionIndex(int collectionIndex) { fCollectionIndex = collectionIndex; return *this; } /** Specify the GX variation axis values. * * Any axes not specified will use the default value. Specified axes not present in the * font will be ignored. * * @param axes not copied. This pointer must remain valid for life of FontParameters. */ FontParameters& setAxes(const Axis* axes, int axisCount) { fAxisCount = axisCount; fAxes = axes; return *this; } int getCollectionIndex() const { return fCollectionIndex; } const Axis* getAxes(int* axisCount) const { *axisCount = fAxisCount; return fAxes; } private: int fCollectionIndex; int fAxisCount; const Axis* fAxes; }; /* Experimental, API subject to change. */ SkTypeface* createFromStream(SkStreamAsset*, const FontParameters&) const; /** * Create a typeface from the specified font data. * Takes ownership of the font data, so the caller should not reference it again. * Will return NULL if the typeface could not be created. * The caller must call unref() on the returned object if it is not null. */ SkTypeface* createFromFontData(SkFontData*) const; /** * Create a typeface for the specified fileName and TTC index * (pass 0 for none) or NULL if the file is not found, or its contents are * not recognized. The caller must call unref() on the returned object * if it is not null. */ SkTypeface* createFromFile(const char path[], int ttcIndex = 0) const; SkTypeface* legacyCreateTypeface(const char familyName[], SkFontStyle style) const; /** * Return a ref to the default fontmgr. The caller must call unref() on * the returned object. */ static SkFontMgr* RefDefault(); protected: virtual int onCountFamilies() const = 0; virtual void onGetFamilyName(int index, SkString* familyName) const = 0; virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; /** May return NULL if the name is not found. */ virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; virtual SkTypeface* onMatchFamilyStyle(const char familyName[], const SkFontStyle&) const = 0; virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, const char* bcp47[], int bcp47Count, SkUnichar character) const = 0; virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, const SkFontStyle&) const = 0; virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const = 0; virtual SkTypeface* onCreateFromStream(SkStreamAsset*, int ttcIndex) const = 0; // TODO: make pure virtual. virtual SkTypeface* onCreateFromStream(SkStreamAsset*, const FontParameters&) const; virtual SkTypeface* onCreateFromFontData(SkFontData*) const; virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const = 0; virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], SkFontStyle) const = 0; private: static SkFontMgr* Factory(); // implemented by porting layer typedef SkRefCnt INHERITED; }; #endif