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/*
* Copyright 2019 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 <android-base/thread_annotations.h>
#include <binder/IBinder.h>
#include <renderengine/ExternalTexture.h>
#include <ui/GraphicBuffer.h>
#include <ui/Rect.h>
#include <utils/StrongPointer.h>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <unordered_map>
#include "Scheduler/OneShotTimer.h"
namespace android {
class IRegionSamplingListener;
class Layer;
class Scheduler;
class SurfaceFlinger;
struct SamplingOffsetCallback;
float sampleArea(const uint32_t* data, int32_t width, int32_t height, int32_t stride,
uint32_t orientation, const Rect& area);
class RegionSamplingThread : public IBinder::DeathRecipient {
public:
struct TimingTunables {
// debug.sf.sampling_duration_ns
// When asynchronously collecting sample, the duration, at which the sampling should start
// before a vsync
std::chrono::nanoseconds mSamplingDuration;
// debug.sf.sampling_period_ns
// This is the maximum amount of time the luma recieving client
// should have to wait for a new luma value after a frame is updated. The inverse of this is
// roughly the sampling rate. Sampling system rounds up sub-vsync sampling period to vsync
// period.
std::chrono::nanoseconds mSamplingPeriod;
// debug.sf.sampling_timer_timeout_ns
// This is the interval at which the luma sampling system will check that the luma clients
// have up to date information. It defaults to the mSamplingPeriod.
std::chrono::nanoseconds mSamplingTimerTimeout;
};
struct EnvironmentTimingTunables : TimingTunables {
EnvironmentTimingTunables();
};
explicit RegionSamplingThread(SurfaceFlinger& flinger, const TimingTunables& tunables);
explicit RegionSamplingThread(SurfaceFlinger& flinger);
~RegionSamplingThread();
// Add a listener to receive luma notifications. The luma reported via listener will
// report the median luma for the layers under the stopLayerHandle, in the samplingArea region.
void addListener(const Rect& samplingArea, const wp<Layer>& stopLayer,
const sp<IRegionSamplingListener>& listener);
// Remove the listener to stop receiving median luma notifications.
void removeListener(const sp<IRegionSamplingListener>& listener);
// Notifies sampling engine that composition is done and new content is
// available, and the deadline for the sampling work on the main thread to
// be completed without eating the budget of another frame.
void onCompositionComplete(
std::optional<std::chrono::steady_clock::time_point> samplingDeadline);
private:
struct Descriptor {
Rect area = Rect::EMPTY_RECT;
wp<Layer> stopLayer;
sp<IRegionSamplingListener> listener;
};
struct WpHash {
size_t operator()(const wp<IBinder>& p) const {
return std::hash<IBinder*>()(p.unsafe_get());
}
};
std::vector<float> sampleBuffer(
const sp<GraphicBuffer>& buffer, const Point& leftTop,
const std::vector<RegionSamplingThread::Descriptor>& descriptors, uint32_t orientation);
void doSample(std::optional<std::chrono::steady_clock::time_point> samplingDeadline);
void binderDied(const wp<IBinder>& who) override;
void checkForStaleLuma();
void captureSample();
void threadMain();
SurfaceFlinger& mFlinger;
const TimingTunables mTunables;
scheduler::OneShotTimer mIdleTimer;
std::thread mThread;
std::mutex mThreadControlMutex;
std::condition_variable_any mCondition;
bool mRunning GUARDED_BY(mThreadControlMutex) = true;
bool mSampleRequested GUARDED_BY(mThreadControlMutex) = false;
std::optional<std::chrono::steady_clock::time_point> mSampleRequestTime
GUARDED_BY(mThreadControlMutex);
std::chrono::steady_clock::time_point mLastSampleTime GUARDED_BY(mThreadControlMutex);
std::mutex mSamplingMutex;
std::unordered_map<wp<IBinder>, Descriptor, WpHash> mDescriptors GUARDED_BY(mSamplingMutex);
std::shared_ptr<renderengine::ExternalTexture> mCachedBuffer GUARDED_BY(mSamplingMutex) =
nullptr;
};
} // namespace android
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