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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MINIKIN_SYSTEM_FONTS_H
#define MINIKIN_SYSTEM_FONTS_H
#include <map>
#include <memory>
#include <mutex>
#include <string>
#include "minikin/FontCollection.h"
#include "minikin/U16StringPiece.h"
namespace minikin {
// Provides a system font mapping.
class SystemFonts {
public:
static std::shared_ptr<FontCollection> findFontCollection(const std::string& familyName) {
return getInstance().findFontCollectionInternal(familyName);
}
static void registerFallback(const std::string& familyName,
const std::shared_ptr<FontCollection>& fc) {
return getInstance().registerFallbackInternal(familyName, fc);
}
static void registerDefault(const std::shared_ptr<FontCollection>& fc) {
return getInstance().registerDefaultInternal(fc);
}
using FontMapDeleter = std::function<void()>;
static void addFontMap(std::shared_ptr<FontCollection>&& collections) {
return getInstance().addFontMapInternal(std::move(collections));
}
// This obtains a mutex inside, so do not call this method inside callback.
static void getFontSet(std::function<void(const std::vector<std::shared_ptr<Font>>&)> func) {
return getInstance().getFontSetInternal(func);
}
protected:
// Visible for testing purposes.
SystemFonts() {}
virtual ~SystemFonts() {}
std::shared_ptr<FontCollection> findFontCollectionInternal(const std::string& familyName);
void registerFallbackInternal(const std::string& familyName,
const std::shared_ptr<FontCollection>& fc) {
std::lock_guard<std::mutex> lock(mMutex);
mSystemFallbacks[familyName] = fc;
}
void registerDefaultInternal(const std::shared_ptr<FontCollection>& fc) {
std::lock_guard<std::mutex> lock(mMutex);
mDefaultFallback = fc;
}
void addFontMapInternal(std::shared_ptr<FontCollection>&& collections) {
std::lock_guard<std::mutex> lock(mMutex);
mCollections.emplace_back(std::move(collections));
}
void getFontSetInternal(std::function<void(const std::vector<std::shared_ptr<Font>>&)> func) {
std::lock_guard<std::mutex> lock(mMutex);
if (!mFonts) {
buildFontSetLocked();
}
func(mFonts.value());
}
private:
static SystemFonts& getInstance();
void buildFontSetLocked() EXCLUSIVE_LOCKS_REQUIRED(mMutex);
std::map<std::string, std::shared_ptr<FontCollection>> mSystemFallbacks GUARDED_BY(mMutex);
std::shared_ptr<FontCollection> mDefaultFallback GUARDED_BY(mMutex);
std::vector<std::shared_ptr<FontCollection>> mCollections GUARDED_BY(mMutex);
std::optional<std::vector<std::shared_ptr<Font>>> mFonts GUARDED_BY(mMutex);
std::mutex mMutex;
};
} // namespace minikin
#endif // MINIKIN_SYSTEM_FONTS_H
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