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- /*
- * 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 "include/core/SkFontArguments.h"
- #include "include/core/SkFontStyle.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/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 family.
- * Note that most systems don't have a default system family, so passing nullptr will often
- * result in the empty set.
- *
- * 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 return nullptr if no 'good' match 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.
- */
- sk_sp<SkTypeface> makeFromData(sk_sp<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.
- */
- sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, int ttcIndex = 0) const;
- /* Experimental, API subject to change. */
- sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, const SkFontArguments&) const;
- /**
- * Create a typeface from the specified font data.
- * Will return NULL if the typeface could not be created.
- * The caller must call unref() on the returned object if it is not null.
- */
- sk_sp<SkTypeface> makeFromFontData(std::unique_ptr<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.
- */
- sk_sp<SkTypeface> makeFromFile(const char path[], int ttcIndex = 0) const;
- sk_sp<SkTypeface> legacyMakeTypeface(const char familyName[], SkFontStyle style) const;
- /** Return the default fontmgr. */
- static sk_sp<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 sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const = 0;
- virtual sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>,
- int ttcIndex) const = 0;
- virtual sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>,
- const SkFontArguments&) const;
- virtual sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData>) const;
- virtual sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const = 0;
- virtual sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const = 0;
- private:
- /** Implemented by porting layer to return the default factory. */
- static sk_sp<SkFontMgr> Factory();
- typedef SkRefCnt INHERITED;
- };
- #endif
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