1 /* 2 * Copyright (C) 2018 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_SYSTEM_FONTS_H 18 #define MINIKIN_SYSTEM_FONTS_H 19 20 #include <map> 21 #include <memory> 22 #include <mutex> 23 #include <string> 24 25 #include "minikin/FontCollection.h" 26 #include "minikin/U16StringPiece.h" 27 28 namespace minikin { 29 30 // Provides a system font mapping. 31 class SystemFonts { 32 public: findFontCollection(const std::string & familyName)33 static std::shared_ptr<FontCollection> findFontCollection(const std::string& familyName) { 34 return getInstance().findFontCollectionInternal(familyName); 35 } 36 registerFallback(const std::string & familyName,const std::shared_ptr<FontCollection> & fc)37 static void registerFallback(const std::string& familyName, 38 const std::shared_ptr<FontCollection>& fc) { 39 return getInstance().registerFallbackInternal(familyName, fc); 40 } 41 registerDefault(const std::shared_ptr<FontCollection> & fc)42 static void registerDefault(const std::shared_ptr<FontCollection>& fc) { 43 return getInstance().registerDefaultInternal(fc); 44 } 45 46 using FontMapDeleter = std::function<void()>; 47 addFontMap(std::shared_ptr<FontCollection> && collections)48 static void addFontMap(std::shared_ptr<FontCollection>&& collections) { 49 return getInstance().addFontMapInternal(std::move(collections)); 50 } 51 52 // This obtains a mutex inside, so do not call this method inside callback. getFontSet(std::function<void (const std::vector<std::shared_ptr<Font>> &)> func)53 static void getFontSet(std::function<void(const std::vector<std::shared_ptr<Font>>&)> func) { 54 return getInstance().getFontSetInternal(func); 55 } 56 57 protected: 58 // Visible for testing purposes. SystemFonts()59 SystemFonts() {} ~SystemFonts()60 virtual ~SystemFonts() {} 61 62 std::shared_ptr<FontCollection> findFontCollectionInternal(const std::string& familyName); registerFallbackInternal(const std::string & familyName,const std::shared_ptr<FontCollection> & fc)63 void registerFallbackInternal(const std::string& familyName, 64 const std::shared_ptr<FontCollection>& fc) { 65 std::lock_guard<std::mutex> lock(mMutex); 66 mSystemFallbacks[familyName] = fc; 67 } 68 registerDefaultInternal(const std::shared_ptr<FontCollection> & fc)69 void registerDefaultInternal(const std::shared_ptr<FontCollection>& fc) { 70 std::lock_guard<std::mutex> lock(mMutex); 71 mDefaultFallback = fc; 72 } 73 addFontMapInternal(std::shared_ptr<FontCollection> && collections)74 void addFontMapInternal(std::shared_ptr<FontCollection>&& collections) { 75 std::lock_guard<std::mutex> lock(mMutex); 76 mCollections.emplace_back(std::move(collections)); 77 } 78 getFontSetInternal(std::function<void (const std::vector<std::shared_ptr<Font>> &)> func)79 void getFontSetInternal(std::function<void(const std::vector<std::shared_ptr<Font>>&)> func) { 80 std::lock_guard<std::mutex> lock(mMutex); 81 if (!mFonts) { 82 buildFontSetLocked(); 83 } 84 func(mFonts.value()); 85 } 86 87 private: 88 static SystemFonts& getInstance(); 89 90 void buildFontSetLocked() EXCLUSIVE_LOCKS_REQUIRED(mMutex); 91 92 std::map<std::string, std::shared_ptr<FontCollection>> mSystemFallbacks GUARDED_BY(mMutex); 93 std::shared_ptr<FontCollection> mDefaultFallback GUARDED_BY(mMutex); 94 std::vector<std::shared_ptr<FontCollection>> mCollections GUARDED_BY(mMutex); 95 std::optional<std::vector<std::shared_ptr<Font>>> mFonts GUARDED_BY(mMutex); 96 97 std::mutex mMutex; 98 }; 99 100 } // namespace minikin 101 102 #endif // MINIKIN_SYSTEM_FONTS_H 103