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 bpc47 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 SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 74 const char bpc47[], uint32_t character) const; 75 76 SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) const; 77 78 /** 79 * Create a typeface for the specified data and TTC index (pass 0 for none) 80 * or NULL if the data is not recognized. The caller must call unref() on 81 * the returned object if it is not null. 82 */ 83 SkTypeface* createFromData(SkData*, int ttcIndex = 0) const; 84 85 /** 86 * Create a typeface for the specified stream and TTC index 87 * (pass 0 for none) or NULL if the stream is not recognized. The caller 88 * must call unref() on the returned object if it is not null. 89 */ 90 SkTypeface* createFromStream(SkStream*, int ttcIndex = 0) const; 91 92 /** 93 * Create a typeface for the specified fileName and TTC index 94 * (pass 0 for none) or NULL if the file is not found, or its contents are 95 * not recognized. The caller must call unref() on the returned object 96 * if it is not null. 97 */ 98 SkTypeface* createFromFile(const char path[], int ttcIndex = 0) const; 99 100 SkTypeface* legacyCreateTypeface(const char familyName[], 101 unsigned typefaceStyleBits) const; 102 103 /** 104 * Return a ref to the default fontmgr. The caller must call unref() on 105 * the returned object. 106 */ 107 static SkFontMgr* RefDefault(); 108 109 protected: 110 virtual int onCountFamilies() const = 0; 111 virtual void onGetFamilyName(int index, SkString* familyName) const = 0; 112 virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0; 113 114 /** May return NULL if the name is not found. */ 115 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0; 116 117 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], 118 const SkFontStyle&) const = 0; 119 // TODO: pure virtual, implement on all impls. 120 virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, 121 const char bpc47[], uint32_t character) const 122 { return NULL; } 123 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, 124 const SkFontStyle&) const = 0; 125 126 virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const = 0; 127 virtual SkTypeface* onCreateFromStream(SkStream*, int ttcIndex) const = 0; 128 virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const = 0; 129 130 virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], 131 unsigned styleBits) const = 0; 132 private: 133 static SkFontMgr* Factory(); // implemented by porting layer 134 static SkFontMgr* CreateDefault(); 135 136 typedef SkRefCnt INHERITED; 137 }; 138 139 #endif 140
