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 "SkFontArguments.h" 12 #include "SkFontStyle.h" 13 #include "SkRefCnt.h" 14 #include "SkTypes.h" 15 16 class SkData; 17 class SkFontData; 18 class SkStreamAsset; 19 class SkString; 20 class SkTypeface; 21 22 class SK_API SkFontStyleSet : public SkRefCnt { 23 public: 24 virtual int count() = 0; 25 virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0; 26 virtual SkTypeface* createTypeface(int index) = 0; 27 virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0; 28 29 static SkFontStyleSet* CreateEmpty(); 30 31 protected: 32 SkTypeface* matchStyleCSS3(const SkFontStyle& pattern); 33 34 private: 35 typedef SkRefCnt INHERITED; 36 }; 37 38 class SK_API SkFontMgr : public SkRefCnt { 39 public: 40 int countFamilies() const; 41 void getFamilyName(int index, SkString* familyName) const; 42 SkFontStyleSet* createStyleSet(int index) const; 43 44 /** 45 * The caller must call unref() on the returned object. 46 * Never returns NULL; will return an empty set if the name is not found. 47 * 48 * Passing nullptr as the parameter will return the default system family. 49 * Note that most systems don't have a default system family, so passing nullptr will often 50 * result in the empty set. 51 * 52 * It is possible that this will return a style set not accessible from 53 * createStyleSet(int) due to hidden or auto-activated fonts. 54 */ 55 SkFontStyleSet* matchFamily(const char familyName[]) const; 56 57 /** 58 * Find the closest matching typeface to the specified familyName and style 59 * and return a ref to it. The caller must call unref() on the returned 60 * object. Will return nullptr if no 'good' match is found. 61 * 62 * Passing |nullptr| as the parameter for |familyName| will return the 63 * default system font. 64 * 65 * It is possible that this will return a style set not accessible from 66 * createStyleSet(int) or matchFamily(const char[]) due to hidden or 67 * auto-activated fonts. 68 */ 69 SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const; 70 71 /** 72 * Use the system fallback to find a typeface for the given character. 73 * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes, 74 * so it is fine to just pass a ISO 639 here. 75 * 76 * Will return NULL if no family can be found for the character 77 * in the system fallback. 78 * 79 * Passing |nullptr| as the parameter for |familyName| will return the 80 * default system font. 81 * 82 * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the 83 * most significant. If no specified bcp47 codes match, any font with the 84 * requested character will be matched. 85 */ 86 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 87 const char* bcp47[], int bcp47Count, 88 SkUnichar character) const; 89 90 SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) 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 from the specified font data. 111 * Will return NULL if the typeface could not be created. 112 * The caller must call unref() on the returned object if it is not null. 113 */ 114 sk_sp<SkTypeface> makeFromFontData(std::unique_ptr<SkFontData>) const; 115 116 /** 117 * Create a typeface for the specified fileName and TTC index 118 * (pass 0 for none) or NULL if the file is not found, or its contents are 119 * not recognized. The caller must call unref() on the returned object 120 * if it is not null. 121 */ 122 sk_sp<SkTypeface> makeFromFile(const char path[], int ttcIndex = 0) const; 123 124 sk_sp<SkTypeface> legacyMakeTypeface(const char familyName[], SkFontStyle style) const; 125 126 /** Return the default fontmgr. */ 127 static sk_sp<SkFontMgr> RefDefault(); 128 129 protected: 130 virtual int onCountFamilies() const = 0; 131 virtual void onGetFamilyName(int index, SkString* familyName) const = 0; 132 virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; 133 134 /** May return NULL if the name is not found. */ 135 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; 136 137 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], 138 const SkFontStyle&) const = 0; 139 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 140 const char* bcp47[], int bcp47Count, 141 SkUnichar character) const = 0; 142 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, 143 const SkFontStyle&) const = 0; 144 145 virtual sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const = 0; 146 virtual sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>, 147 int ttcIndex) const = 0; 148 virtual sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>, 149 const SkFontArguments&) const; 150 virtual sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData>) const; 151 virtual sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const = 0; 152 153 virtual sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const = 0; 154 155 private: 156 157 /** Implemented by porting layer to return the default factory. */ 158 static sk_sp<SkFontMgr> Factory(); 159 160 typedef SkRefCnt INHERITED; 161 }; 162 163 #endif 164
