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/*
* Copyright (C) 2023 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.
*/
#pragma once
#include <chrono>
#include <condition_variable>
#include <functional>
#include <thread>
namespace android {
// NOLINTNEXTLINE(misc-unused-using-decls): False positive
using std::chrono_literals::operator""s;
struct FlatConCallbacks {
std::function<void()> trigger;
};
class FlatteningController {
public:
static auto CreateInstance(FlatConCallbacks &cbks)
-> std::shared_ptr<FlatteningController>;
void Disable() {
auto lock = std::lock_guard<std::mutex>(mutex_);
flatten_next_frame_ = false;
disabled_ = true;
}
/* Compositor should call this every frame */
bool NewFrame();
auto ShouldFlatten() const {
return flatten_next_frame_;
}
void StopThread() {
auto lock = std::lock_guard<std::mutex>(mutex_);
cbks_ = {};
cv_.notify_all();
}
static constexpr auto kTimeout = 1s;
private:
FlatteningController() = default;
static void ThreadFn(const std::shared_ptr<FlatteningController> &fc);
bool flatten_next_frame_{};
bool disabled_{};
decltype(std::chrono::system_clock::now()) sleep_until_{};
std::mutex mutex_;
std::condition_variable cv_;
FlatConCallbacks cbks_;
};
} // namespace android
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