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164 lines
6.4 KiB
164 lines
6.4 KiB
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkFontMgr_DEFINED
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#define SkFontMgr_DEFINED
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#include "SkFontArguments.h"
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#include "SkFontStyle.h"
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#include "SkRefCnt.h"
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#include "SkTypes.h"
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class SkData;
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class SkFontData;
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class SkStreamAsset;
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class SkString;
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class SkTypeface;
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class SK_API SkFontStyleSet : public SkRefCnt {
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public:
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virtual int count() = 0;
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virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0;
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virtual SkTypeface* createTypeface(int index) = 0;
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virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0;
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static SkFontStyleSet* CreateEmpty();
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protected:
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SkTypeface* matchStyleCSS3(const SkFontStyle& pattern);
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private:
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typedef SkRefCnt INHERITED;
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};
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class SK_API SkFontMgr : public SkRefCnt {
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public:
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int countFamilies() const;
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void getFamilyName(int index, SkString* familyName) const;
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SkFontStyleSet* createStyleSet(int index) const;
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/**
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* The caller must call unref() on the returned object.
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* Never returns NULL; will return an empty set if the name is not found.
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*
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* Passing nullptr as the parameter will return the default system family.
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* Note that most systems don't have a default system family, so passing nullptr will often
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* result in the empty set.
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*
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* It is possible that this will return a style set not accessible from
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* createStyleSet(int) due to hidden or auto-activated fonts.
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*/
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SkFontStyleSet* matchFamily(const char familyName[]) const;
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/**
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* Find the closest matching typeface to the specified familyName and style
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* and return a ref to it. The caller must call unref() on the returned
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* object. Will return nullptr if no 'good' match is found.
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*
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* Passing |nullptr| as the parameter for |familyName| will return the
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* default system font.
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*
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* It is possible that this will return a style set not accessible from
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* createStyleSet(int) or matchFamily(const char[]) due to hidden or
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* auto-activated fonts.
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*/
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SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const;
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/**
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* Use the system fallback to find a typeface for the given character.
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* Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes,
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* so it is fine to just pass a ISO 639 here.
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*
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* Will return NULL if no family can be found for the character
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* in the system fallback.
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*
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* Passing |nullptr| as the parameter for |familyName| will return the
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* default system font.
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*
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* bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the
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* most significant. If no specified bcp47 codes match, any font with the
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* requested character will be matched.
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*/
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SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
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const char* bcp47[], int bcp47Count,
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SkUnichar character) const;
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SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) const;
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/**
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* Create a typeface for the specified data and TTC index (pass 0 for none)
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* or NULL if the data is not recognized. The caller must call unref() on
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* the returned object if it is not null.
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*/
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sk_sp<SkTypeface> makeFromData(sk_sp<SkData>, int ttcIndex = 0) const;
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/**
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* Create a typeface for the specified stream and TTC index
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* (pass 0 for none) or NULL if the stream is not recognized. The caller
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* must call unref() on the returned object if it is not null.
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*/
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sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, int ttcIndex = 0) const;
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/* Experimental, API subject to change. */
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sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, const SkFontArguments&) const;
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/**
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* Create a typeface from the specified font data.
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* Will return NULL if the typeface could not be created.
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* The caller must call unref() on the returned object if it is not null.
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*/
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sk_sp<SkTypeface> makeFromFontData(std::unique_ptr<SkFontData>) const;
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/**
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* Create a typeface for the specified fileName and TTC index
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* (pass 0 for none) or NULL if the file is not found, or its contents are
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* not recognized. The caller must call unref() on the returned object
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* if it is not null.
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*/
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sk_sp<SkTypeface> makeFromFile(const char path[], int ttcIndex = 0) const;
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sk_sp<SkTypeface> legacyMakeTypeface(const char familyName[], SkFontStyle style) const;
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/** Return the default fontmgr. */
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static sk_sp<SkFontMgr> RefDefault();
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protected:
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virtual int onCountFamilies() const = 0;
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virtual void onGetFamilyName(int index, SkString* familyName) const = 0;
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virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0;
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/** May return NULL if the name is not found. */
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virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0;
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virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
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const SkFontStyle&) const = 0;
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virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
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const char* bcp47[], int bcp47Count,
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SkUnichar character) const = 0;
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virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
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const SkFontStyle&) const = 0;
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virtual sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const = 0;
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virtual sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>,
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int ttcIndex) const = 0;
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virtual sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>,
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const SkFontArguments&) const;
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virtual sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData>) const;
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virtual sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const = 0;
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virtual sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const = 0;
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private:
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/** Implemented by porting layer to return the default factory. */
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static sk_sp<SkFontMgr> Factory();
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typedef SkRefCnt INHERITED;
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};
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#endif
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