1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MINIKIN_FONT_FAMILY_H 18 #define MINIKIN_FONT_FAMILY_H 19 20 #include <vector> 21 #include <string> 22 23 #include <utils/TypeHelpers.h> 24 25 #include <minikin/MinikinRefCounted.h> 26 27 namespace android { 28 29 class MinikinFont; 30 31 // FontLanguage is a compact representation of a bcp-47 language tag. It 32 // does not capture all possible information, only what directly affects 33 // font rendering. 34 class FontLanguage { 35 friend class FontStyle; 36 public: 37 FontLanguage() : mBits(0) { } 38 39 // Parse from string 40 FontLanguage(const char* buf, size_t size); 41 42 bool operator==(const FontLanguage other) const { return mBits == other.mBits; } 43 operator bool() const { return mBits != 0; } 44 45 std::string getString() const; 46 47 // 0 = no match, 1 = language matches, 2 = language and script match 48 int match(const FontLanguage other) const; 49 50 private: 51 explicit FontLanguage(uint32_t bits) : mBits(bits) { } 52 53 uint32_t bits() const { return mBits; } 54 55 static const uint32_t kBaseLangMask = 0xffff; 56 static const uint32_t kScriptMask = (1 << 18) - (1 << 16); 57 static const uint32_t kHansFlag = 1 << 16; 58 static const uint32_t kHantFlag = 1 << 17; 59 uint32_t mBits; 60 }; 61 62 // FontStyle represents all style information needed to select an actual font 63 // from a collection. The implementation is packed into a single 32-bit word 64 // so it can be efficiently copied, embedded in other objects, etc. 65 class FontStyle { 66 public: 67 FontStyle(int weight = 4, bool italic = false) { 68 bits = (weight & kWeightMask) | (italic ? kItalicMask : 0); 69 } 70 FontStyle(FontLanguage lang, int variant = 0, int weight = 4, bool italic = false) { 71 bits = (weight & kWeightMask) | (italic ? kItalicMask : 0) 72 | (variant << kVariantShift) | (lang.bits() << kLangShift); 73 } 74 int getWeight() const { return bits & kWeightMask; } 75 bool getItalic() const { return (bits & kItalicMask) != 0; } 76 int getVariant() const { return (bits >> kVariantShift) & kVariantMask; } 77 FontLanguage getLanguage() const { return FontLanguage(bits >> kLangShift); } 78 79 bool operator==(const FontStyle other) const { return bits == other.bits; } 80 81 hash_t hash() const { return bits; } 82 private: 83 static const uint32_t kWeightMask = (1 << 4) - 1; 84 static const uint32_t kItalicMask = 1 << 4; 85 static const int kVariantShift = 5; 86 static const uint32_t kVariantMask = (1 << 2) - 1; 87 static const int kLangShift = 7; 88 uint32_t bits; 89 }; 90 91 enum FontVariant { 92 VARIANT_DEFAULT = 0, 93 VARIANT_COMPACT = 1, 94 VARIANT_ELEGANT = 2, 95 }; 96 97 inline hash_t hash_type(const FontStyle &style) { 98 return style.hash(); 99 } 100 101 // attributes representing transforms (fake bold, fake italic) to match styles 102 class FontFakery { 103 public: 104 FontFakery() : mFakeBold(false), mFakeItalic(false) { } 105 FontFakery(bool fakeBold, bool fakeItalic) : mFakeBold(fakeBold), mFakeItalic(fakeItalic) { } 106 // TODO: want to support graded fake bolding 107 bool isFakeBold() { return mFakeBold; } 108 bool isFakeItalic() { return mFakeItalic; } 109 private: 110 bool mFakeBold; 111 bool mFakeItalic; 112 }; 113 114 struct FakedFont { 115 // ownership is the enclosing FontCollection 116 MinikinFont* font; 117 FontFakery fakery; 118 }; 119 120 class FontFamily : public MinikinRefCounted { 121 public: 122 FontFamily() { } 123 124 FontFamily(FontLanguage lang, int variant) : mLang(lang), mVariant(variant) { 125 } 126 127 ~FontFamily(); 128 129 // Add font to family, extracting style information from the font 130 bool addFont(MinikinFont* typeface); 131 132 void addFont(MinikinFont* typeface, FontStyle style); 133 FakedFont getClosestMatch(FontStyle style) const; 134 135 FontLanguage lang() const { return mLang; } 136 int variant() const { return mVariant; } 137 138 // API's for enumerating the fonts in a family. These don't guarantee any particular order 139 size_t getNumFonts() const; 140 MinikinFont* getFont(size_t index) const; 141 FontStyle getStyle(size_t index) const; 142 private: 143 void addFontLocked(MinikinFont* typeface, FontStyle style); 144 145 class Font { 146 public: 147 Font(MinikinFont* typeface, FontStyle style) : 148 typeface(typeface), style(style) { } 149 MinikinFont* typeface; 150 FontStyle style; 151 }; 152 FontLanguage mLang; 153 int mVariant; 154 std::vector<Font> mFonts; 155 }; 156 157 } // namespace android 158 159 #endif // MINIKIN_FONT_FAMILY_H 160
