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 never return NULL, as it will return the default font if 61 * no matching font is found. 62 * 63 * Passing |nullptr| as the parameter for |familyName| will return the 64 * default system font. 65 * 66 * It is possible that this will return a style set not accessible from 67 * createStyleSet(int) or matchFamily(const char[]) due to hidden or 68 * auto-activated fonts. 69 */ 70 SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const; 71 72 /** 73 * Use the system fallback to find a typeface for the given character. 74 * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes, 75 * so it is fine to just pass a ISO 639 here. 76 * 77 * Will return NULL if no family can be found for the character 78 * in the system fallback. 79 * 80 * Passing |nullptr| as the parameter for |familyName| will return the 81 * default system font. 82 * 83 * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the 84 * most significant. If no specified bcp47 codes match, any font with the 85 * requested character will be matched. 86 */ 87 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 88 const char* bcp47[], int bcp47Count, 89 SkUnichar character) const; 90 91 SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) const; 92 93 /** 94 * Create a typeface for the specified data and TTC index (pass 0 for none) 95 * or NULL if the data is not recognized. The caller must call unref() on 96 * the returned object if it is not null. 97 */ 98 sk_sp<SkTypeface> makeFromData(sk_sp<SkData>, int ttcIndex = 0) const; 99 100 /** 101 * Create a typeface for the specified stream and TTC index 102 * (pass 0 for none) or NULL if the stream is not recognized. The caller 103 * must call unref() on the returned object if it is not null. 104 */ 105 sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, int ttcIndex = 0) const; 106 107 /* Experimental, API subject to change. */ 108 sk_sp<SkTypeface> makeFromStream(std::unique_ptr<SkStreamAsset>, const SkFontArguments&) const; 109 110 /** 111 * Create a typeface from the specified font data. 112 * Will return NULL if the typeface could not be created. 113 * The caller must call unref() on the returned object if it is not null. 114 */ 115 sk_sp<SkTypeface> makeFromFontData(std::unique_ptr<SkFontData>) const; 116 117 /** 118 * Create a typeface for the specified fileName and TTC index 119 * (pass 0 for none) or NULL if the file is not found, or its contents are 120 * not recognized. The caller must call unref() on the returned object 121 * if it is not null. 122 */ 123 sk_sp<SkTypeface> makeFromFile(const char path[], int ttcIndex = 0) const; 124 125 sk_sp<SkTypeface> legacyMakeTypeface(const char familyName[], SkFontStyle style) const; 126 127 /** Return the default fontmgr. */ 128 static sk_sp<SkFontMgr> RefDefault(); 129 130 protected: 131 virtual int onCountFamilies() const = 0; 132 virtual void onGetFamilyName(int index, SkString* familyName) const = 0; 133 virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; 134 135 /** May return NULL if the name is not found. */ 136 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; 137 138 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], 139 const SkFontStyle&) const = 0; 140 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 141 const char* bcp47[], int bcp47Count, 142 SkUnichar character) const = 0; 143 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, 144 const SkFontStyle&) const = 0; 145 146 virtual sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const = 0; 147 virtual sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>, 148 int ttcIndex) const = 0; 149 virtual sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>, 150 const SkFontArguments&) const; 151 virtual sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData>) const; 152 virtual sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const = 0; 153 154 virtual sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const = 0; 155 156 private: 157 158 /** Implemented by porting layer to return the default factory. */ 159 static sk_sp<SkFontMgr> Factory(); 160 161 typedef SkRefCnt INHERITED; 162 }; 163 164 #endif 165