services/surfaceflinger/BufferQueueLayer.cpp - android_frameworks_native - Gitiles

 /*
  * 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.
  */

 #include "BufferQueueLayer.h"
 #include "LayerRejecter.h"
 #include "clz.h"

 #include <system/window.h>

 namespace android {

 BufferQueueLayer::BufferQueueLayer(SurfaceFlinger* flinger, const sp<Client>& client,
                                    const String8& name, uint32_t w, uint32_t h, uint32_t flags)
       : BufferLayer(flinger, client, name, w, h, flags),
         mConsumer(nullptr),
         mProducer(nullptr),
         mFormat(PIXEL_FORMAT_NONE),
         mPreviousFrameNumber(0),
         mUpdateTexImageFailed(false),
         mQueueItemLock(),
         mQueueItemCondition(),
         mQueueItems(),
         mLastFrameNumberReceived(0),
         mAutoRefresh(false),
         mActiveBufferSlot(BufferQueue::INVALID_BUFFER_SLOT),
         mQueuedFrames(0),
         mSidebandStreamChanged(false) {
     mCurrentState.requested_legacy = mCurrentState.active_legacy;
 }

 // -----------------------------------------------------------------------
 // Interface implementation for Layer
 // -----------------------------------------------------------------------

 void BufferQueueLayer::onLayerDisplayed(const sp<Fence>& releaseFence) {
     mConsumer->setReleaseFence(releaseFence);
 }

 void BufferQueueLayer::abandon() {
     mConsumer->abandon();
 }

 void BufferQueueLayer::setTransformHint(uint32_t orientation) const {
     mConsumer->setTransformHint(orientation);
 }

 std::vector<OccupancyTracker::Segment> BufferQueueLayer::getOccupancyHistory(bool forceFlush) {
     std::vector<OccupancyTracker::Segment> history;
     status_t result = mConsumer->getOccupancyHistory(forceFlush, &history);
     if (result != NO_ERROR) {
         ALOGW("[%s] Failed to obtain occupancy history (%d)", mName.string(), result);
         return {};
     }
     return history;
 }

 bool BufferQueueLayer::getTransformToDisplayInverse() const {
     return mConsumer->getTransformToDisplayInverse();
 }

 void BufferQueueLayer::releasePendingBuffer(nsecs_t dequeueReadyTime) {
     if (!mConsumer->releasePendingBuffer()) {
         return;
     }

     auto releaseFenceTime = std::make_shared<FenceTime>(mConsumer->getPrevFinalReleaseFence());
     mReleaseTimeline.updateSignalTimes();
     mReleaseTimeline.push(releaseFenceTime);

     Mutex::Autolock lock(mFrameEventHistoryMutex);
     if (mPreviousFrameNumber != 0) {
         mFrameEventHistory.addRelease(mPreviousFrameNumber, dequeueReadyTime,
                                       std::move(releaseFenceTime));
     }
 }

 void BufferQueueLayer::setDefaultBufferSize(uint32_t w, uint32_t h) {
     mConsumer->setDefaultBufferSize(w, h);
 }

 int32_t BufferQueueLayer::getQueuedFrameCount() const {
     return mQueuedFrames;
 }

 bool BufferQueueLayer::shouldPresentNow(const DispSync& dispSync) const {
     if (getSidebandStreamChanged() || getAutoRefresh()) {
         return true;
     }

     if (!hasDrawingBuffer()) {
         return false;
     }

     Mutex::Autolock lock(mQueueItemLock);

     const int64_t addedTime = mQueueItems[0].mTimestamp;
     const nsecs_t expectedPresentTime = mConsumer->computeExpectedPresent(dispSync);

     // Ignore timestamps more than a second in the future
     const bool isPlausible = addedTime < (expectedPresentTime + s2ns(1));
     ALOGW_IF(!isPlausible,
              "[%s] Timestamp %" PRId64 " seems implausible "
              "relative to expectedPresent %" PRId64,
              mName.string(), addedTime, expectedPresentTime);

     const bool isDue = addedTime < expectedPresentTime;
     return isDue || !isPlausible;
 }

 // -----------------------------------------------------------------------
 // Interface implementation for BufferLayer
 // -----------------------------------------------------------------------

 bool BufferQueueLayer::fenceHasSignaled() const {
     if (latchUnsignaledBuffers()) {
         return true;
     }

     if (!hasDrawingBuffer()) {
         return true;
     }

     Mutex::Autolock lock(mQueueItemLock);
     if (mQueueItems[0].mIsDroppable) {
         // Even though this buffer's fence may not have signaled yet, it could
         // be replaced by another buffer before it has a chance to, which means
         // that it's possible to get into a situation where a buffer is never
         // able to be latched. To avoid this, grab this buffer anyway.
         return true;
     }
     return mQueueItems[0].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
 }

 nsecs_t BufferQueueLayer::getDesiredPresentTime() {
     return mConsumer->getTimestamp();
 }

 std::shared_ptr<FenceTime> BufferQueueLayer::getCurrentFenceTime() const {
     return mConsumer->getCurrentFenceTime();
 }

 void BufferQueueLayer::getDrawingTransformMatrix(float *matrix) {
     return mConsumer->getTransformMatrix(matrix);
 }

 // NOTE: SurfaceFlinger's definitions of "Current" and "Drawing" do not neatly map to BufferQueue's
 // These functions get the fields for the frame that is currently in SurfaceFlinger's Drawing state
 // so the functions start with "getDrawing". The data is retrieved from the BufferQueueConsumer's
 // current buffer so the consumer functions start with "getCurrent".
 //
 // This results in the rather confusing functions below.
 uint32_t BufferQueueLayer::getDrawingTransform() const {
     return mConsumer->getCurrentTransform();
 }

 ui::Dataspace BufferQueueLayer::getDrawingDataSpace() const {
     return mConsumer->getCurrentDataSpace();
 }

 Rect BufferQueueLayer::getDrawingCrop() const {
     return mConsumer->getCurrentCrop();
 }

 uint32_t BufferQueueLayer::getDrawingScalingMode() const {
     return mConsumer->getCurrentScalingMode();
 }

 Region BufferQueueLayer::getDrawingSurfaceDamage() const {
     return mConsumer->getSurfaceDamage();
 }

 const HdrMetadata& BufferQueueLayer::getDrawingHdrMetadata() const {
     return mConsumer->getCurrentHdrMetadata();
 }

 int BufferQueueLayer::getDrawingApi() const {
     return mConsumer->getCurrentApi();
 }

 PixelFormat BufferQueueLayer::getPixelFormat() const {
     return mFormat;
 }

 uint64_t BufferQueueLayer::getFrameNumber() const {
     Mutex::Autolock lock(mQueueItemLock);
     return mQueueItems[0].mFrameNumber;
 }

 bool BufferQueueLayer::getAutoRefresh() const {
     return mAutoRefresh;
 }

 bool BufferQueueLayer::getSidebandStreamChanged() const {
     return mSidebandStreamChanged;
 }

 std::optional<Region> BufferQueueLayer::latchSidebandStream(bool& recomputeVisibleRegions) {
     if (android_atomic_acquire_cas(true, false, &mSidebandStreamChanged) == 0) {
         // mSidebandStreamChanged was true
         // replicated in LayerBE until FE/BE is ready to be synchronized
         getBE().compositionInfo.hwc.sidebandStream = mConsumer->getSidebandStream();
         if (getBE().compositionInfo.hwc.sidebandStream != nullptr) {
             setTransactionFlags(eTransactionNeeded);
             mFlinger->setTransactionFlags(eTraversalNeeded);
         }
         recomputeVisibleRegions = true;

         const State& s(getDrawingState());
         return getTransform().transform(Region(Rect(s.active_legacy.w, s.active_legacy.h)));
     }
     return {};
 }

 bool BufferQueueLayer::hasDrawingBuffer() const {
     return mQueuedFrames > 0;
 }

 void BufferQueueLayer::setFilteringEnabled(bool enabled) {
     return mConsumer->setFilteringEnabled(enabled);
 }

 status_t BufferQueueLayer::bindTextureImage() const {
     return mConsumer->bindTextureImage();
 }

 status_t BufferQueueLayer::updateTexImage(bool& recomputeVisibleRegions, nsecs_t latchTime) {
     // This boolean is used to make sure that SurfaceFlinger's shadow copy
     // of the buffer queue isn't modified when the buffer queue is returning
     // BufferItem's that weren't actually queued. This can happen in shared
     // buffer mode.
     bool queuedBuffer = false;
     LayerRejecter r(mDrawingState, getCurrentState(), recomputeVisibleRegions,
                     getProducerStickyTransform() != 0, mName.string(), mOverrideScalingMode,
                     getTransformToDisplayInverse(), mFreezeGeometryUpdates);
     status_t updateResult =
             mConsumer->updateTexImage(&r, *mFlinger->mPrimaryDispSync, &mAutoRefresh, &queuedBuffer,
                                       mLastFrameNumberReceived);
     if (updateResult == BufferQueue::PRESENT_LATER) {
         // Producer doesn't want buffer to be displayed yet.  Signal a
         // layer update so we check again at the next opportunity.
         mFlinger->signalLayerUpdate();
         return BAD_VALUE;
     } else if (updateResult == BufferLayerConsumer::BUFFER_REJECTED) {
         // If the buffer has been rejected, remove it from the shadow queue
         // and return early
         if (queuedBuffer) {
             Mutex::Autolock lock(mQueueItemLock);
             mTimeStats.removeTimeRecord(getName().c_str(), mQueueItems[0].mFrameNumber);
             mQueueItems.removeAt(0);
             android_atomic_dec(&mQueuedFrames);
         }
         return BAD_VALUE;
     } else if (updateResult != NO_ERROR || mUpdateTexImageFailed) {
         // This can occur if something goes wrong when trying to create the
         // EGLImage for this buffer. If this happens, the buffer has already
         // been released, so we need to clean up the queue and bug out
         // early.
         if (queuedBuffer) {
             Mutex::Autolock lock(mQueueItemLock);
             mQueueItems.clear();
             android_atomic_and(0, &mQueuedFrames);
             mTimeStats.clearLayerRecord(getName().c_str());
         }

         // Once we have hit this state, the shadow queue may no longer
         // correctly reflect the incoming BufferQueue's contents, so even if
         // updateTexImage starts working, the only safe course of action is
         // to continue to ignore updates.
         mUpdateTexImageFailed = true;

         return BAD_VALUE;
     }

     if (queuedBuffer) {
         // Autolock scope
         auto currentFrameNumber = mConsumer->getFrameNumber();

         Mutex::Autolock lock(mQueueItemLock);

         // Remove any stale buffers that have been dropped during
         // updateTexImage
         while (mQueueItems[0].mFrameNumber != currentFrameNumber) {
             mTimeStats.removeTimeRecord(getName().c_str(), mQueueItems[0].mFrameNumber);
             mQueueItems.removeAt(0);
             android_atomic_dec(&mQueuedFrames);
         }

         const std::string layerName(getName().c_str());
         mTimeStats.setAcquireFence(layerName, currentFrameNumber, mQueueItems[0].mFenceTime);
         mTimeStats.setLatchTime(layerName, currentFrameNumber, latchTime);

         mQueueItems.removeAt(0);
     }

     // Decrement the queued-frames count.  Signal another event if we
     // have more frames pending.
     if ((queuedBuffer && android_atomic_dec(&mQueuedFrames) > 1) || mAutoRefresh) {
         mFlinger->signalLayerUpdate();
     }

     return NO_ERROR;
 }

 status_t BufferQueueLayer::updateActiveBuffer() {
     // update the active buffer
     mActiveBuffer = mConsumer->getCurrentBuffer(&mActiveBufferSlot);
     getBE().compositionInfo.mBuffer = mActiveBuffer;
     getBE().compositionInfo.mBufferSlot = mActiveBufferSlot;

     if (mActiveBuffer == nullptr) {
         // this can only happen if the very first buffer was rejected.
         return BAD_VALUE;
     }
     return NO_ERROR;
 }

 status_t BufferQueueLayer::updateFrameNumber(nsecs_t latchTime) {
     mPreviousFrameNumber = mCurrentFrameNumber;
     mCurrentFrameNumber = mConsumer->getFrameNumber();

     {
         Mutex::Autolock lock(mFrameEventHistoryMutex);
         mFrameEventHistory.addLatch(mCurrentFrameNumber, latchTime);
     }
     return NO_ERROR;
 }

 void BufferQueueLayer::setHwcLayerBuffer(const sp<const DisplayDevice>& display) {
     const auto displayId = display->getId();
     auto& hwcInfo = getBE().mHwcLayers[displayId];
     auto& hwcLayer = hwcInfo.layer;

     uint32_t hwcSlot = 0;
     sp<GraphicBuffer> hwcBuffer;
     hwcInfo.bufferCache.getHwcBuffer(mActiveBufferSlot, mActiveBuffer, &hwcSlot, &hwcBuffer);

     auto acquireFence = mConsumer->getCurrentFence();
     auto error = hwcLayer->setBuffer(hwcSlot, hwcBuffer, acquireFence);
     if (error != HWC2::Error::None) {
         ALOGE("[%s] Failed to set buffer %p: %s (%d)", mName.string(),
               getBE().compositionInfo.mBuffer->handle, to_string(error).c_str(),
               static_cast<int32_t>(error));
     }
 }

 // -----------------------------------------------------------------------
 // Interface implementation for BufferLayerConsumer::ContentsChangedListener
 // -----------------------------------------------------------------------

 void BufferQueueLayer::onFrameAvailable(const BufferItem& item) {
     // Add this buffer from our internal queue tracker
     { // Autolock scope
         Mutex::Autolock lock(mQueueItemLock);
         // Reset the frame number tracker when we receive the first buffer after
         // a frame number reset
         if (item.mFrameNumber == 1) {
             mLastFrameNumberReceived = 0;
         }

         // Ensure that callbacks are handled in order
         while (item.mFrameNumber != mLastFrameNumberReceived + 1) {
             status_t result = mQueueItemCondition.waitRelative(mQueueItemLock, ms2ns(500));
             if (result != NO_ERROR) {
                 ALOGE("[%s] Timed out waiting on callback", mName.string());
             }
         }

         mQueueItems.push_back(item);
         android_atomic_inc(&mQueuedFrames);

         // Wake up any pending callbacks
         mLastFrameNumberReceived = item.mFrameNumber;
         mQueueItemCondition.broadcast();
     }

     mFlinger->mInterceptor->saveBufferUpdate(this, item.mGraphicBuffer->getWidth(),
                                              item.mGraphicBuffer->getHeight(), item.mFrameNumber);
     mFlinger->signalLayerUpdate();
 }

 void BufferQueueLayer::onFrameReplaced(const BufferItem& item) {
     { // Autolock scope
         Mutex::Autolock lock(mQueueItemLock);

         // Ensure that callbacks are handled in order
         while (item.mFrameNumber != mLastFrameNumberReceived + 1) {
             status_t result = mQueueItemCondition.waitRelative(mQueueItemLock, ms2ns(500));
             if (result != NO_ERROR) {
                 ALOGE("[%s] Timed out waiting on callback", mName.string());
             }
         }

         if (!hasDrawingBuffer()) {
             ALOGE("Can't replace a frame on an empty queue");
             return;
         }
         mQueueItems.editItemAt(mQueueItems.size() - 1) = item;

         // Wake up any pending callbacks
         mLastFrameNumberReceived = item.mFrameNumber;
         mQueueItemCondition.broadcast();
     }
 }

 void BufferQueueLayer::onSidebandStreamChanged() {
     if (android_atomic_release_cas(false, true, &mSidebandStreamChanged) == 0) {
         // mSidebandStreamChanged was false
         mFlinger->signalLayerUpdate();
     }
 }

 // -----------------------------------------------------------------------

 void BufferQueueLayer::onFirstRef() {
     BufferLayer::onFirstRef();

     // Creates a custom BufferQueue for SurfaceFlingerConsumer to use
     sp<IGraphicBufferProducer> producer;
     sp<IGraphicBufferConsumer> consumer;
     BufferQueue::createBufferQueue(&producer, &consumer, true);
     mProducer = new MonitoredProducer(producer, mFlinger, this);
     {
         // Grab the SF state lock during this since it's the only safe way to access RenderEngine
         Mutex::Autolock lock(mFlinger->mStateLock);
         mConsumer =
                 new BufferLayerConsumer(consumer, mFlinger->getRenderEngine(), mTextureName, this);
     }
     mConsumer->setConsumerUsageBits(getEffectiveUsage(0));
     mConsumer->setContentsChangedListener(this);
     mConsumer->setName(mName);

     if (mFlinger->isLayerTripleBufferingDisabled()) {
         mProducer->setMaxDequeuedBufferCount(2);
     }
 }

 status_t BufferQueueLayer::setDefaultBufferProperties(uint32_t w, uint32_t h, PixelFormat format) {
     uint32_t const maxSurfaceDims =
             min(mFlinger->getMaxTextureSize(), mFlinger->getMaxViewportDims());

     // never allow a surface larger than what our underlying GL implementation
     // can handle.
     if ((uint32_t(w) > maxSurfaceDims) || (uint32_t(h) > maxSurfaceDims)) {
         ALOGE("dimensions too large %u x %u", uint32_t(w), uint32_t(h));
         return BAD_VALUE;
     }

     mFormat = format;

     setDefaultBufferSize(w, h);
     mConsumer->setDefaultBufferFormat(format);
     mConsumer->setConsumerUsageBits(getEffectiveUsage(0));

     return NO_ERROR;
 }

 sp<IGraphicBufferProducer> BufferQueueLayer::getProducer() const {
     return mProducer;
 }

 uint32_t BufferQueueLayer::getProducerStickyTransform() const {
     int producerStickyTransform = 0;
     int ret = mProducer->query(NATIVE_WINDOW_STICKY_TRANSFORM, &producerStickyTransform);
     if (ret != OK) {
         ALOGW("%s: Error %s (%d) while querying window sticky transform.", __FUNCTION__,
               strerror(-ret), ret);
         return 0;
     }
     return static_cast<uint32_t>(producerStickyTransform);
 }

 } // namespace android
	/*
	* 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.
	*/

	#include "BufferQueueLayer.h"
	#include "LayerRejecter.h"
	#include "clz.h"

	#include <system/window.h>

	namespace android {

	BufferQueueLayer::BufferQueueLayer(SurfaceFlinger* flinger, const sp<Client>& client,
	const String8& name, uint32_t w, uint32_t h, uint32_t flags)
	: BufferLayer(flinger, client, name, w, h, flags),
	mConsumer(nullptr),
	mProducer(nullptr),
	mFormat(PIXEL_FORMAT_NONE),
	mPreviousFrameNumber(0),
	mUpdateTexImageFailed(false),
	mQueueItemLock(),
	mQueueItemCondition(),
	mQueueItems(),
	mLastFrameNumberReceived(0),
	mAutoRefresh(false),
	mActiveBufferSlot(BufferQueue::INVALID_BUFFER_SLOT),
	mQueuedFrames(0),
	mSidebandStreamChanged(false) {
	mCurrentState.requested_legacy = mCurrentState.active_legacy;
	}

	// -----------------------------------------------------------------------
	// Interface implementation for Layer
	// -----------------------------------------------------------------------

	void BufferQueueLayer::onLayerDisplayed(const sp<Fence>& releaseFence) {
	mConsumer->setReleaseFence(releaseFence);
	}

	void BufferQueueLayer::abandon() {
	mConsumer->abandon();
	}

	void BufferQueueLayer::setTransformHint(uint32_t orientation) const {
	mConsumer->setTransformHint(orientation);
	}

	std::vector<OccupancyTracker::Segment> BufferQueueLayer::getOccupancyHistory(bool forceFlush) {
	std::vector<OccupancyTracker::Segment> history;
	status_t result = mConsumer->getOccupancyHistory(forceFlush, &history);
	if (result != NO_ERROR) {
	ALOGW("[%s] Failed to obtain occupancy history (%d)", mName.string(), result);
	return {};
	}
	return history;
	}

	bool BufferQueueLayer::getTransformToDisplayInverse() const {
	return mConsumer->getTransformToDisplayInverse();
	}

	void BufferQueueLayer::releasePendingBuffer(nsecs_t dequeueReadyTime) {
	if (!mConsumer->releasePendingBuffer()) {
	return;
	}

	auto releaseFenceTime = std::make_shared<FenceTime>(mConsumer->getPrevFinalReleaseFence());
	mReleaseTimeline.updateSignalTimes();
	mReleaseTimeline.push(releaseFenceTime);

	Mutex::Autolock lock(mFrameEventHistoryMutex);
	if (mPreviousFrameNumber != 0) {
	mFrameEventHistory.addRelease(mPreviousFrameNumber, dequeueReadyTime,
	std::move(releaseFenceTime));
	}
	}

	void BufferQueueLayer::setDefaultBufferSize(uint32_t w, uint32_t h) {
	mConsumer->setDefaultBufferSize(w, h);
	}

	int32_t BufferQueueLayer::getQueuedFrameCount() const {
	return mQueuedFrames;
	}

	bool BufferQueueLayer::shouldPresentNow(const DispSync& dispSync) const {
	if (getSidebandStreamChanged() \|\| getAutoRefresh()) {
	return true;
	}

	if (!hasDrawingBuffer()) {
	return false;
	}

	Mutex::Autolock lock(mQueueItemLock);

	const int64_t addedTime = mQueueItems[0].mTimestamp;
	const nsecs_t expectedPresentTime = mConsumer->computeExpectedPresent(dispSync);

	// Ignore timestamps more than a second in the future
	const bool isPlausible = addedTime < (expectedPresentTime + s2ns(1));
	ALOGW_IF(!isPlausible,
	"[%s] Timestamp %" PRId64 " seems implausible "
	"relative to expectedPresent %" PRId64,
	mName.string(), addedTime, expectedPresentTime);

	const bool isDue = addedTime < expectedPresentTime;
	return isDue \|\| !isPlausible;
	}

	// -----------------------------------------------------------------------
	// Interface implementation for BufferLayer
	// -----------------------------------------------------------------------

	bool BufferQueueLayer::fenceHasSignaled() const {
	if (latchUnsignaledBuffers()) {
	return true;
	}

	if (!hasDrawingBuffer()) {
	return true;
	}

	Mutex::Autolock lock(mQueueItemLock);
	if (mQueueItems[0].mIsDroppable) {
	// Even though this buffer's fence may not have signaled yet, it could
	// be replaced by another buffer before it has a chance to, which means
	// that it's possible to get into a situation where a buffer is never
	// able to be latched. To avoid this, grab this buffer anyway.
	return true;
	}
	return mQueueItems[0].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
	}

	nsecs_t BufferQueueLayer::getDesiredPresentTime() {
	return mConsumer->getTimestamp();
	}

	std::shared_ptr<FenceTime> BufferQueueLayer::getCurrentFenceTime() const {
	return mConsumer->getCurrentFenceTime();
	}

	void BufferQueueLayer::getDrawingTransformMatrix(float *matrix) {
	return mConsumer->getTransformMatrix(matrix);
	}

	// NOTE: SurfaceFlinger's definitions of "Current" and "Drawing" do not neatly map to BufferQueue's
	// These functions get the fields for the frame that is currently in SurfaceFlinger's Drawing state
	// so the functions start with "getDrawing". The data is retrieved from the BufferQueueConsumer's
	// current buffer so the consumer functions start with "getCurrent".
	//
	// This results in the rather confusing functions below.
	uint32_t BufferQueueLayer::getDrawingTransform() const {
	return mConsumer->getCurrentTransform();
	}

	ui::Dataspace BufferQueueLayer::getDrawingDataSpace() const {
	return mConsumer->getCurrentDataSpace();
	}

	Rect BufferQueueLayer::getDrawingCrop() const {
	return mConsumer->getCurrentCrop();
	}

	uint32_t BufferQueueLayer::getDrawingScalingMode() const {
	return mConsumer->getCurrentScalingMode();
	}

	Region BufferQueueLayer::getDrawingSurfaceDamage() const {
	return mConsumer->getSurfaceDamage();
	}

	const HdrMetadata& BufferQueueLayer::getDrawingHdrMetadata() const {
	return mConsumer->getCurrentHdrMetadata();
	}

	int BufferQueueLayer::getDrawingApi() const {
	return mConsumer->getCurrentApi();
	}

	PixelFormat BufferQueueLayer::getPixelFormat() const {
	return mFormat;
	}

	uint64_t BufferQueueLayer::getFrameNumber() const {
	Mutex::Autolock lock(mQueueItemLock);
	return mQueueItems[0].mFrameNumber;
	}

	bool BufferQueueLayer::getAutoRefresh() const {
	return mAutoRefresh;
	}

	bool BufferQueueLayer::getSidebandStreamChanged() const {
	return mSidebandStreamChanged;
	}

	std::optional<Region> BufferQueueLayer::latchSidebandStream(bool& recomputeVisibleRegions) {
	if (android_atomic_acquire_cas(true, false, &mSidebandStreamChanged) == 0) {
	// mSidebandStreamChanged was true
	// replicated in LayerBE until FE/BE is ready to be synchronized
	getBE().compositionInfo.hwc.sidebandStream = mConsumer->getSidebandStream();
	if (getBE().compositionInfo.hwc.sidebandStream != nullptr) {
	setTransactionFlags(eTransactionNeeded);
	mFlinger->setTransactionFlags(eTraversalNeeded);
	}
	recomputeVisibleRegions = true;

	const State& s(getDrawingState());
	return getTransform().transform(Region(Rect(s.active_legacy.w, s.active_legacy.h)));
	}
	return {};
	}

	bool BufferQueueLayer::hasDrawingBuffer() const {
	return mQueuedFrames > 0;
	}

	void BufferQueueLayer::setFilteringEnabled(bool enabled) {
	return mConsumer->setFilteringEnabled(enabled);
	}

	status_t BufferQueueLayer::bindTextureImage() const {
	return mConsumer->bindTextureImage();
	}

	status_t BufferQueueLayer::updateTexImage(bool& recomputeVisibleRegions, nsecs_t latchTime) {
	// This boolean is used to make sure that SurfaceFlinger's shadow copy
	// of the buffer queue isn't modified when the buffer queue is returning
	// BufferItem's that weren't actually queued. This can happen in shared
	// buffer mode.
	bool queuedBuffer = false;
	LayerRejecter r(mDrawingState, getCurrentState(), recomputeVisibleRegions,
	getProducerStickyTransform() != 0, mName.string(), mOverrideScalingMode,
	getTransformToDisplayInverse(), mFreezeGeometryUpdates);
	status_t updateResult =
	mConsumer->updateTexImage(&r, *mFlinger->mPrimaryDispSync, &mAutoRefresh, &queuedBuffer,
	mLastFrameNumberReceived);
	if (updateResult == BufferQueue::PRESENT_LATER) {
	// Producer doesn't want buffer to be displayed yet. Signal a
	// layer update so we check again at the next opportunity.
	mFlinger->signalLayerUpdate();
	return BAD_VALUE;
	} else if (updateResult == BufferLayerConsumer::BUFFER_REJECTED) {
	// If the buffer has been rejected, remove it from the shadow queue
	// and return early
	if (queuedBuffer) {
	Mutex::Autolock lock(mQueueItemLock);
	mTimeStats.removeTimeRecord(getName().c_str(), mQueueItems[0].mFrameNumber);
	mQueueItems.removeAt(0);
	android_atomic_dec(&mQueuedFrames);
	}
	return BAD_VALUE;
	} else if (updateResult != NO_ERROR \|\| mUpdateTexImageFailed) {
	// This can occur if something goes wrong when trying to create the
	// EGLImage for this buffer. If this happens, the buffer has already
	// been released, so we need to clean up the queue and bug out
	// early.
	if (queuedBuffer) {
	Mutex::Autolock lock(mQueueItemLock);
	mQueueItems.clear();
	android_atomic_and(0, &mQueuedFrames);
	mTimeStats.clearLayerRecord(getName().c_str());
	}

	// Once we have hit this state, the shadow queue may no longer
	// correctly reflect the incoming BufferQueue's contents, so even if
	// updateTexImage starts working, the only safe course of action is
	// to continue to ignore updates.
	mUpdateTexImageFailed = true;

	return BAD_VALUE;
	}

	if (queuedBuffer) {
	// Autolock scope
	auto currentFrameNumber = mConsumer->getFrameNumber();

	Mutex::Autolock lock(mQueueItemLock);

	// Remove any stale buffers that have been dropped during
	// updateTexImage
	while (mQueueItems[0].mFrameNumber != currentFrameNumber) {
	mTimeStats.removeTimeRecord(getName().c_str(), mQueueItems[0].mFrameNumber);
	mQueueItems.removeAt(0);
	android_atomic_dec(&mQueuedFrames);
	}

	const std::string layerName(getName().c_str());
	mTimeStats.setAcquireFence(layerName, currentFrameNumber, mQueueItems[0].mFenceTime);
	mTimeStats.setLatchTime(layerName, currentFrameNumber, latchTime);

	mQueueItems.removeAt(0);
	}

	// Decrement the queued-frames count. Signal another event if we
	// have more frames pending.
	if ((queuedBuffer && android_atomic_dec(&mQueuedFrames) > 1) \|\| mAutoRefresh) {
	mFlinger->signalLayerUpdate();
	}

	return NO_ERROR;
	}

	status_t BufferQueueLayer::updateActiveBuffer() {
	// update the active buffer
	mActiveBuffer = mConsumer->getCurrentBuffer(&mActiveBufferSlot);
	getBE().compositionInfo.mBuffer = mActiveBuffer;
	getBE().compositionInfo.mBufferSlot = mActiveBufferSlot;

	if (mActiveBuffer == nullptr) {
	// this can only happen if the very first buffer was rejected.
	return BAD_VALUE;
	}
	return NO_ERROR;
	}

	status_t BufferQueueLayer::updateFrameNumber(nsecs_t latchTime) {
	mPreviousFrameNumber = mCurrentFrameNumber;
	mCurrentFrameNumber = mConsumer->getFrameNumber();

	{
	Mutex::Autolock lock(mFrameEventHistoryMutex);
	mFrameEventHistory.addLatch(mCurrentFrameNumber, latchTime);
	}
	return NO_ERROR;
	}

	void BufferQueueLayer::setHwcLayerBuffer(const sp<const DisplayDevice>& display) {
	const auto displayId = display->getId();
	auto& hwcInfo = getBE().mHwcLayers[displayId];
	auto& hwcLayer = hwcInfo.layer;

	uint32_t hwcSlot = 0;
	sp<GraphicBuffer> hwcBuffer;
	hwcInfo.bufferCache.getHwcBuffer(mActiveBufferSlot, mActiveBuffer, &hwcSlot, &hwcBuffer);

	auto acquireFence = mConsumer->getCurrentFence();
	auto error = hwcLayer->setBuffer(hwcSlot, hwcBuffer, acquireFence);
	if (error != HWC2::Error::None) {
	ALOGE("[%s] Failed to set buffer %p: %s (%d)", mName.string(),
	getBE().compositionInfo.mBuffer->handle, to_string(error).c_str(),
	static_cast<int32_t>(error));
	}
	}

	// -----------------------------------------------------------------------
	// Interface implementation for BufferLayerConsumer::ContentsChangedListener
	// -----------------------------------------------------------------------

	void BufferQueueLayer::onFrameAvailable(const BufferItem& item) {
	// Add this buffer from our internal queue tracker
	{ // Autolock scope
	Mutex::Autolock lock(mQueueItemLock);
	// Reset the frame number tracker when we receive the first buffer after
	// a frame number reset
	if (item.mFrameNumber == 1) {
	mLastFrameNumberReceived = 0;
	}

	// Ensure that callbacks are handled in order
	while (item.mFrameNumber != mLastFrameNumberReceived + 1) {
	status_t result = mQueueItemCondition.waitRelative(mQueueItemLock, ms2ns(500));
	if (result != NO_ERROR) {
	ALOGE("[%s] Timed out waiting on callback", mName.string());
	}
	}

	mQueueItems.push_back(item);
	android_atomic_inc(&mQueuedFrames);

	// Wake up any pending callbacks
	mLastFrameNumberReceived = item.mFrameNumber;
	mQueueItemCondition.broadcast();
	}

	mFlinger->mInterceptor->saveBufferUpdate(this, item.mGraphicBuffer->getWidth(),
	item.mGraphicBuffer->getHeight(), item.mFrameNumber);
	mFlinger->signalLayerUpdate();
	}

	void BufferQueueLayer::onFrameReplaced(const BufferItem& item) {
	{ // Autolock scope
	Mutex::Autolock lock(mQueueItemLock);

	// Ensure that callbacks are handled in order
	while (item.mFrameNumber != mLastFrameNumberReceived + 1) {
	status_t result = mQueueItemCondition.waitRelative(mQueueItemLock, ms2ns(500));
	if (result != NO_ERROR) {
	ALOGE("[%s] Timed out waiting on callback", mName.string());
	}
	}

	if (!hasDrawingBuffer()) {
	ALOGE("Can't replace a frame on an empty queue");
	return;
	}
	mQueueItems.editItemAt(mQueueItems.size() - 1) = item;

	// Wake up any pending callbacks
	mLastFrameNumberReceived = item.mFrameNumber;
	mQueueItemCondition.broadcast();
	}
	}

	void BufferQueueLayer::onSidebandStreamChanged() {
	if (android_atomic_release_cas(false, true, &mSidebandStreamChanged) == 0) {
	// mSidebandStreamChanged was false
	mFlinger->signalLayerUpdate();
	}
	}

	// -----------------------------------------------------------------------

	void BufferQueueLayer::onFirstRef() {
	BufferLayer::onFirstRef();

	// Creates a custom BufferQueue for SurfaceFlingerConsumer to use
	sp<IGraphicBufferProducer> producer;
	sp<IGraphicBufferConsumer> consumer;
	BufferQueue::createBufferQueue(&producer, &consumer, true);
	mProducer = new MonitoredProducer(producer, mFlinger, this);
	{
	// Grab the SF state lock during this since it's the only safe way to access RenderEngine
	Mutex::Autolock lock(mFlinger->mStateLock);
	mConsumer =
	new BufferLayerConsumer(consumer, mFlinger->getRenderEngine(), mTextureName, this);
	}
	mConsumer->setConsumerUsageBits(getEffectiveUsage(0));
	mConsumer->setContentsChangedListener(this);
	mConsumer->setName(mName);

	if (mFlinger->isLayerTripleBufferingDisabled()) {
	mProducer->setMaxDequeuedBufferCount(2);
	}
	}

	status_t BufferQueueLayer::setDefaultBufferProperties(uint32_t w, uint32_t h, PixelFormat format) {
	uint32_t const maxSurfaceDims =
	min(mFlinger->getMaxTextureSize(), mFlinger->getMaxViewportDims());

	// never allow a surface larger than what our underlying GL implementation
	// can handle.
	if ((uint32_t(w) > maxSurfaceDims) \|\| (uint32_t(h) > maxSurfaceDims)) {
	ALOGE("dimensions too large %u x %u", uint32_t(w), uint32_t(h));
	return BAD_VALUE;
	}

	mFormat = format;

	setDefaultBufferSize(w, h);
	mConsumer->setDefaultBufferFormat(format);
	mConsumer->setConsumerUsageBits(getEffectiveUsage(0));

	return NO_ERROR;
	}

	sp<IGraphicBufferProducer> BufferQueueLayer::getProducer() const {
	return mProducer;
	}

	uint32_t BufferQueueLayer::getProducerStickyTransform() const {
	int producerStickyTransform = 0;
	int ret = mProducer->query(NATIVE_WINDOW_STICKY_TRANSFORM, &producerStickyTransform);
	if (ret != OK) {
	ALOGW("%s: Error %s (%d) while querying window sticky transform.", __FUNCTION__,
	strerror(-ret), ret);
	return 0;
	}
	return static_cast<uint32_t>(producerStickyTransform);
	}

	} // namespace android