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 "SkRefCnt.h" 12 #include "SkFontStyle.h" 13 14 class SkData; 15 class SkStream; 16 class SkString; 17 class SkTypeface; 18 19 class SK_API SkFontStyleSet : public SkRefCnt { 20 public: 21 SK_DECLARE_INST_COUNT(SkFontStyleSet) 22 23 virtual int count() = 0; 24 virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0; 25 virtual SkTypeface* createTypeface(int index) = 0; 26 virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0; 27 28 static SkFontStyleSet* CreateEmpty(); 29 30 private: 31 typedef SkRefCnt INHERITED; 32 }; 33 34 class SkTypeface; 35 36 class SK_API SkFontMgr : public SkRefCnt { 37 public: 38 SK_DECLARE_INST_COUNT(SkFontMgr) 39 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 * It is possible that this will return a style set not accessible from 49 * createStyleSet(int) due to hidden or auto-activated fonts. 50 */ 51 SkFontStyleSet* matchFamily(const char familyName[]) const; 52 53 /** 54 * Find the closest matching typeface to the specified familyName and style 55 * and return a ref to it. The caller must call unref() on the returned 56 * object. Will never return NULL, as it will return the default font if 57 * no matching font is found. 58 * 59 * It is possible that this will return a style set not accessible from 60 * createStyleSet(int) or matchFamily(const char[]) due to hidden or 61 * auto-activated fonts. 62 */ 63 SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const; 64 65 /** 66 * Use the system fallback to find a typeface for the given character. 67 * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes, 68 * so it is fine to just pass a ISO 639 here. 69 * 70 * Will return NULL if no family can be found for the character 71 * in the system fallback. 72 * 73 * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the 74 * most significant. If no specified bcp47 codes match, any font with the 75 * requested character will be matched. 76 */ 77 #ifdef SK_FM_NEW_MATCH_FAMILY_STYLE_CHARACTER 78 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 79 const char* bcp47[], int bcp47Count, 80 SkUnichar character) const; 81 #else 82 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 83 const char bcp47[], SkUnichar character) const; 84 #endif 85 86 SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) 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 SkTypeface* createFromData(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 SkTypeface* createFromStream(SkStream*, int ttcIndex = 0) const; 101 102 /** 103 * Create a typeface for the specified fileName and TTC index 104 * (pass 0 for none) or NULL if the file is not found, or its contents are 105 * not recognized. The caller must call unref() on the returned object 106 * if it is not null. 107 */ 108 SkTypeface* createFromFile(const char path[], int ttcIndex = 0) const; 109 110 SkTypeface* legacyCreateTypeface(const char familyName[], 111 unsigned typefaceStyleBits) const; 112 113 /** 114 * Return a ref to the default fontmgr. The caller must call unref() on 115 * the returned object. 116 */ 117 static SkFontMgr* RefDefault(); 118 119 protected: 120 virtual int onCountFamilies() const = 0; 121 virtual void onGetFamilyName(int index, SkString* familyName) const = 0; 122 virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; 123 124 /** May return NULL if the name is not found. */ 125 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; 126 127 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], 128 const SkFontStyle&) const = 0; 129 // TODO: pure virtual, implement on all impls. 130 #ifdef SK_FM_NEW_MATCH_FAMILY_STYLE_CHARACTER 131 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 132 const char* bcp47[], int bcp47Count, 133 SkUnichar character) const 134 #else 135 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 136 const char bcp47[], SkUnichar character) const 137 #endif 138 { return NULL; } 139 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, 140 const SkFontStyle&) const = 0; 141 142 virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const = 0; 143 virtual SkTypeface* onCreateFromStream(SkStream*, int ttcIndex) const = 0; 144 virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const = 0; 145 146 virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], 147 unsigned styleBits) const = 0; 148 private: 149 static SkFontMgr* Factory(); // implemented by porting layer 150 static SkFontMgr* CreateDefault(); 151 152 typedef SkRefCnt INHERITED; 153 }; 154 155 #endif 156
