1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkFontMgr_DEFINED 9 #define SkFontMgr_DEFINED 10 11 #include "include/core/SkFontArguments.h" 12 #include "include/core/SkFontStyle.h" 13 #include "include/core/SkRefCnt.h" 14 #include "include/core/SkTypes.h" 15 16 #include <memory> 17 18 class SkData; 19 class SkFontData; 20 class SkStreamAsset; 21 class SkString; 22 class SkTypeface; 23 24 class SK_API SkFontStyleSet : public SkRefCnt { 25 public: 26 virtual int count() = 0; 27 virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0; 28 virtual SkTypeface* createTypeface(int index) = 0; 29 virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0; 30 31 static SkFontStyleSet* CreateEmpty(); 32 33 protected: 34 SkTypeface* matchStyleCSS3(const SkFontStyle& pattern); 35 36 private: 37 using INHERITED = SkRefCnt; 38 }; 39 40 class SK_API SkFontMgr : public SkRefCnt { 41 public: 42 int countFamilies() const; 43 void getFamilyName(int index, SkString* familyName) const; 44 SkFontStyleSet* createStyleSet(int index) const; 45 46 /** 47 * The caller must call unref() on the returned object. 48 * Never returns NULL; will return an empty set if the name is not found. 49 * 50 * Passing nullptr as the parameter will return the default system family. 51 * Note that most systems don't have a default system family, so passing nullptr will often 52 * result in the empty set. 53 * 54 * It is possible that this will return a style set not accessible from 55 * createStyleSet(int) due to hidden or auto-activated fonts. 56 */ 57 SkFontStyleSet* matchFamily(const char familyName[]) const; 58 59 /** 60 * Find the closest matching typeface to the specified familyName and style 61 * and return a ref to it. The caller must call unref() on the returned 62 * object. Will return nullptr if no 'good' match is found. 63 * 64 * Passing |nullptr| as the parameter for |familyName| will return the 65 * default system font. 66 * 67 * It is possible that this will return a style set not accessible from 68 * createStyleSet(int) or matchFamily(const char[]) due to hidden or 69 * auto-activated fonts. 70 */ 71 SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const; 72 73 /** 74 * Use the system fallback to find a typeface for the given character. 75 * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes, 76 * so it is fine to just pass a ISO 639 here. 77 * 78 * Will return NULL if no family can be found for the character 79 * in the system fallback. 80 * 81 * Passing |nullptr| as the parameter for |familyName| will return the 82 * default system font. 83 * 84 * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the 85 * most significant. If no specified bcp47 codes match, any font with the 86 * requested character will be matched. 87 */ 88 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 89 const char* bcp47[], int bcp47Count, 90 SkUnichar character) const; 91 92 /** 93 * Create a typeface for the specified data and TTC index (pass 0 for none) 94 * or NULL if the data is not recognized. The caller must call unref() on 95 * the returned object if it is not null. 96 */ 97 sk_sp<SkTypeface> makeFromData(sk_sp<SkData>, int ttcIndex = 0) const; 98 99 /** 100 * Create a typeface for the specified stream and TTC index 101 * (pass 0 for none) or NULL if the stream is not recognized. The caller 102 * must call unref() on the returned object if it is not null. 103 */ 104 sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, int ttcIndex = 0) const; 105 106 /* Experimental, API subject to change. */ 107 sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, const SkFontArguments&) const; 108 109 /** 110 * Create a typeface for the specified fileName and TTC index 111 * (pass 0 for none) or NULL if the file is not found, or its contents are 112 * not recognized. The caller must call unref() on the returned object 113 * if it is not null. 114 */ 115 sk_sp<SkTypeface> makeFromFile(const char path[], int ttcIndex = 0) const; 116 117 sk_sp<SkTypeface> legacyMakeTypeface(const char familyName[], SkFontStyle style) const; 118 119 /** Return the default fontmgr. */ 120 static sk_sp<SkFontMgr> RefDefault(); 121 122 /* Returns an empty font manager without any typeface dependencies */ 123 static sk_sp<SkFontMgr> RefEmpty(); 124 125 protected: 126 virtual int onCountFamilies() const = 0; 127 virtual void onGetFamilyName(int index, SkString* familyName) const = 0; 128 virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; 129 130 /** May return NULL if the name is not found. */ 131 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; 132 133 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], 134 const SkFontStyle&) const = 0; 135 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 136 const char* bcp47[], int bcp47Count, 137 SkUnichar character) const = 0; 138 139 virtual sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const = 0; 140 virtual sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>, 141 int ttcIndex) const = 0; 142 virtual sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>, 143 const SkFontArguments&) const = 0; 144 virtual sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const = 0; 145 146 virtual sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const = 0; 147 148 // this method is never called -- will be removed onMatchFaceStyle(const SkTypeface *,const SkFontStyle &)149 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, 150 const SkFontStyle&) const { 151 return nullptr; 152 } 153 154 private: 155 156 /** Implemented by porting layer to return the default factory. */ 157 static sk_sp<SkFontMgr> Factory(); 158 159 using INHERITED = SkRefCnt; 160 }; 161 162 #endif 163