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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <unordered_map>
#include <android-base/thread_annotations.h>
#include <binder/IBinder.h>
#include <ui/GraphicBuffer.h>
#include <ui/Rect.h>
#include <utils/StrongPointer.h>
#include "Scheduler/IdleTimer.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 {
struct TimingTunables {
// debug.sf.sampling_offset_ns
// When asynchronously collecting sample, the offset, from zero phase in the vsync timeline
// at which the sampling should start.
std::chrono::nanoseconds mSamplingOffset;
// 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 {
explicit RegionSamplingThread(SurfaceFlinger& flinger, Scheduler& scheduler,
const TimingTunables& tunables);
explicit RegionSamplingThread(SurfaceFlinger& flinger, Scheduler& scheduler);
// 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 sp<IBinder>& stopLayerHandle,
const sp<IRegionSamplingListener>& listener);
// Remove the listener to stop receiving median luma notifications.
void removeListener(const sp<IRegionSamplingListener>& listener);
// Notifies sampling engine that new content is available. This will trigger a sampling
// pass at some point in the future.
void notifyNewContent();
// Notifies the sampling engine that it has a good timing window in which to sample.
void notifySamplingOffset();
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();
void binderDied(const wp<IBinder>& who) override;
void checkForStaleLuma();
void captureSample();
void threadMain();
SurfaceFlinger& mFlinger;
Scheduler& mScheduler;
const TimingTunables mTunables;
scheduler::IdleTimer mIdleTimer;
std::unique_ptr<SamplingOffsetCallback> const mPhaseCallback;
std::thread mThread;
std::mutex mThreadControlMutex;
std::condition_variable_any mCondition;
bool mRunning GUARDED_BY(mThreadControlMutex) = true;
bool mSampleRequested GUARDED_BY(mThreadControlMutex) = false;
bool mDiscardedFrames GUARDED_BY(mThreadControlMutex) = false;
std::chrono::nanoseconds lastSampleTime GUARDED_BY(mThreadControlMutex);
std::mutex mSamplingMutex;
std::unordered_map<wp<IBinder>, Descriptor, WpHash> mDescriptors GUARDED_BY(mSamplingMutex);
sp<GraphicBuffer> mCachedBuffer GUARDED_BY(mSamplingMutex) = nullptr;
} // namespace android