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