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/*
* Copyright (C) 2009 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 <cstdint>
#include <future>
#include <type_traits>
#include <utility>
#include <android-base/thread_annotations.h>
#include <android/gui/IDisplayEventConnection.h>
#include <private/gui/BitTube.h>
#include <utils/Looper.h>
#include <utils/Timers.h>
#include "EventThread.h"
#include "TracedOrdinal.h"
#include "VSyncDispatch.h"
namespace android {
struct ICompositor {
virtual bool commit(nsecs_t frameTime, int64_t vsyncId, nsecs_t expectedVsyncTime) = 0;
virtual void composite(nsecs_t frameTime, int64_t vsyncId) = 0;
virtual void sample() = 0;
protected:
~ICompositor() = default;
};
template <typename F>
class Task : public MessageHandler {
template <typename G>
friend auto makeTask(G&&);
explicit Task(F&& f) : mTask(std::move(f)) {}
void handleMessage(const Message&) override { mTask(); }
using T = std::invoke_result_t<F>;
std::packaged_task<T()> mTask;
};
template <typename F>
inline auto makeTask(F&& f) {
sp<Task<F>> task = new Task<F>(std::move(f));
return std::make_pair(task, task->mTask.get_future());
}
class MessageQueue {
public:
virtual ~MessageQueue() = default;
virtual void initVsync(scheduler::VSyncDispatch&, frametimeline::TokenManager&,
std::chrono::nanoseconds workDuration) = 0;
virtual void setDuration(std::chrono::nanoseconds workDuration) = 0;
virtual void setInjector(sp<EventThreadConnection>) = 0;
virtual void waitMessage() = 0;
virtual void postMessage(sp<MessageHandler>&&) = 0;
virtual void scheduleFrame() = 0;
using Clock = std::chrono::steady_clock;
virtual std::optional<Clock::time_point> getScheduledFrameTime() const = 0;
};
namespace impl {
class MessageQueue : public android::MessageQueue {
protected:
class Handler : public MessageHandler {
MessageQueue& mQueue;
std::atomic_bool mFramePending = false;
std::atomic<int64_t> mVsyncId = 0;
std::atomic<nsecs_t> mExpectedVsyncTime = 0;
public:
explicit Handler(MessageQueue& queue) : mQueue(queue) {}
void handleMessage(const Message& message) override;
bool isFramePending() const;
virtual void dispatchFrame(int64_t vsyncId, nsecs_t expectedVsyncTime);
};
friend class Handler;
// For tests.
MessageQueue(ICompositor&, sp<Handler>);
void vsyncCallback(nsecs_t vsyncTime, nsecs_t targetWakeupTime, nsecs_t readyTime);
private:
ICompositor& mCompositor;
const sp<Looper> mLooper;
const sp<Handler> mHandler;
struct Vsync {
frametimeline::TokenManager* tokenManager = nullptr;
std::unique_ptr<scheduler::VSyncCallbackRegistration> registration;
mutable std::mutex mutex;
TracedOrdinal<std::chrono::nanoseconds> workDuration
GUARDED_BY(mutex) = {"VsyncWorkDuration-sf", std::chrono::nanoseconds(0)};
std::chrono::nanoseconds lastCallbackTime GUARDED_BY(mutex) = std::chrono::nanoseconds{0};
std::optional<nsecs_t> scheduledFrameTime GUARDED_BY(mutex);
TracedOrdinal<int> value = {"VSYNC-sf", 0};
};
struct Injector {
gui::BitTube tube;
std::mutex mutex;
sp<EventThreadConnection> connection GUARDED_BY(mutex);
};
Vsync mVsync;
Injector mInjector;
void injectorCallback();
public:
explicit MessageQueue(ICompositor&);
void initVsync(scheduler::VSyncDispatch&, frametimeline::TokenManager&,
std::chrono::nanoseconds workDuration) override;
void setDuration(std::chrono::nanoseconds workDuration) override;
void setInjector(sp<EventThreadConnection>) override;
void waitMessage() override;
void postMessage(sp<MessageHandler>&&) override;
void scheduleFrame() override;
std::optional<Clock::time_point> getScheduledFrameTime() const override;
};
} // namespace impl
} // namespace android
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