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.
  */

 // TODO(b/129481165): remove the #pragma below and fix conversion issues
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wconversion"

 #undef LOG_TAG
 #define LOG_TAG "BufferQueueLayer"
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
 #include "BufferQueueLayer.h"

 #include <compositionengine/LayerFECompositionState.h>
 #include <gui/BufferQueueConsumer.h>
 #include <system/window.h>

 #include "LayerRejecter.h"
 #include "SurfaceInterceptor.h"

 #include "FrameTracer/FrameTracer.h"
 #include "Scheduler/LayerHistory.h"
 #include "TimeStats/TimeStats.h"

 namespace android {

 BufferQueueLayer::BufferQueueLayer(const LayerCreationArgs& args) : BufferLayer(args) {}

 BufferQueueLayer::~BufferQueueLayer() {
     mContentsChangedListener->abandon();
     mConsumer->abandon();
 }

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

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

     // Prevent tracing the same release multiple times.
     if (mPreviousFrameNumber != mPreviousReleasedFrameNumber) {
         mFlinger->mFrameTracer->traceFence(getSequence(), mPreviousBufferId, mPreviousFrameNumber,
                                            std::make_shared<FenceTime>(releaseFence),
                                            FrameTracer::FrameEvent::RELEASE_FENCE);
         mPreviousReleasedFrameNumber = mPreviousFrameNumber;
     }
 }

 void BufferQueueLayer::setTransformHint(ui::Transform::RotationFlags displayTransformHint) {
     BufferLayer::setTransformHint(displayTransformHint);
     mConsumer->setTransformHint(mTransformHint);
 }

 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)", getDebugName(), result);
         return {};
     }
     return history;
 }

 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(nsecs_t expectedPresentTime) const {
     if (getSidebandStreamChanged() || getAutoRefresh()) {
         return true;
     }

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

     Mutex::Autolock lock(mQueueItemLock);

     const int64_t addedTime = mQueueItems[0].mTimestamp;

     // 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,
              getDebugName(), addedTime, expectedPresentTime);

     if (!isPlausible) {
         mFlinger->mTimeStats->incrementBadDesiredPresent(getSequence());
     }

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

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

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

     if (!hasFrameUpdate()) {
         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;
     }
     const bool fenceSignaled =
             mQueueItems[0].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
     if (!fenceSignaled) {
         mFlinger->mTimeStats->incrementLatchSkipped(getSequence(),
                                                     TimeStats::LatchSkipReason::LateAcquire);
     }

     return fenceSignaled;
 }

 bool BufferQueueLayer::framePresentTimeIsCurrent(nsecs_t expectedPresentTime) const {
     if (!hasFrameUpdate() || isRemovedFromCurrentState()) {
         return true;
     }

     Mutex::Autolock lock(mQueueItemLock);
     return mQueueItems[0].mTimestamp <= expectedPresentTime;
 }

 uint64_t BufferQueueLayer::getFrameNumber(nsecs_t expectedPresentTime) const {
     Mutex::Autolock lock(mQueueItemLock);
     uint64_t frameNumber = mQueueItems[0].mFrameNumber;

     // The head of the queue will be dropped if there are signaled and timely frames behind it
     if (isRemovedFromCurrentState()) {
         expectedPresentTime = 0;
     }

     for (int i = 1; i < mQueueItems.size(); i++) {
         const bool fenceSignaled =
                 mQueueItems[i].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
         if (!fenceSignaled) {
             break;
         }

         // We don't drop frames without explicit timestamps
         if (mQueueItems[i].mIsAutoTimestamp) {
             break;
         }

         const nsecs_t desiredPresent = mQueueItems[i].mTimestamp;
         if (desiredPresent < expectedPresentTime - BufferQueueConsumer::MAX_REASONABLE_NSEC ||
             desiredPresent > expectedPresentTime) {
             break;
         }

         frameNumber = mQueueItems[i].mFrameNumber;
     }

     return frameNumber;
 }

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

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

 bool BufferQueueLayer::latchSidebandStream(bool& recomputeVisibleRegions) {
     bool sidebandStreamChanged = true;
     if (mSidebandStreamChanged.compare_exchange_strong(sidebandStreamChanged, false)) {
         // mSidebandStreamChanged was changed to false
         mSidebandStream = mConsumer->getSidebandStream();
         auto* layerCompositionState = editCompositionState();
         layerCompositionState->sidebandStream = mSidebandStream;
         if (layerCompositionState->sidebandStream != nullptr) {
             setTransactionFlags(eTransactionNeeded);
             mFlinger->setTransactionFlags(eTraversalNeeded);
         }
         recomputeVisibleRegions = true;

         return true;
     }
     return false;
 }

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

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

 status_t BufferQueueLayer::updateTexImage(bool& recomputeVisibleRegions, nsecs_t latchTime,
                                           nsecs_t expectedPresentTime) {
     // 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;
     const int32_t layerId = getSequence();
     LayerRejecter r(mDrawingState, getCurrentState(), recomputeVisibleRegions,
                     getProducerStickyTransform() != 0, mName, mOverrideScalingMode,
                     getTransformToDisplayInverse());

     if (isRemovedFromCurrentState()) {
         expectedPresentTime = 0;
     }

     // updateTexImage() below might drop the some buffers at the head of the queue if there is a
     // buffer behind them which is timely to be presented. However this buffer may not be signaled
     // yet. The code below makes sure that this wouldn't happen by setting maxFrameNumber to the
     // last buffer that was signaled.
     uint64_t lastSignaledFrameNumber = mLastFrameNumberReceived;
     {
         Mutex::Autolock lock(mQueueItemLock);
         for (int i = 0; i < mQueueItems.size(); i++) {
             bool fenceSignaled =
                     mQueueItems[i].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
             if (!fenceSignaled) {
                 break;
             }
             lastSignaledFrameNumber = mQueueItems[i].mFrameNumber;
         }
     }
     const uint64_t maxFrameNumberToAcquire =
             std::min(mLastFrameNumberReceived.load(), lastSignaledFrameNumber);

     status_t updateResult = mConsumer->updateTexImage(&r, expectedPresentTime, &mAutoRefresh,
                                                       &queuedBuffer, maxFrameNumberToAcquire);
     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);
             mConsumer->mergeSurfaceDamage(mQueueItems[0].mSurfaceDamage);
             mFlinger->mTimeStats->removeTimeRecord(layerId, mQueueItems[0].mFrameNumber);
             mQueueItems.removeAt(0);
             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();
             mQueuedFrames = 0;
             mFlinger->mTimeStats->onDestroy(layerId);
             mFlinger->mFrameTracer->onDestroy(layerId);
         }

         // 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) {
             mConsumer->mergeSurfaceDamage(mQueueItems[0].mSurfaceDamage);
             mFlinger->mTimeStats->removeTimeRecord(layerId, mQueueItems[0].mFrameNumber);
             mQueueItems.removeAt(0);
             mQueuedFrames--;
         }

         uint64_t bufferID = mQueueItems[0].mGraphicBuffer->getId();
         mFlinger->mTimeStats->setLatchTime(layerId, currentFrameNumber, latchTime);
         mFlinger->mFrameTracer->traceTimestamp(layerId, bufferID, currentFrameNumber, latchTime,
                                                FrameTracer::FrameEvent::LATCH);

         mQueueItems.removeAt(0);
     }

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

     return NO_ERROR;
 }

 status_t BufferQueueLayer::updateActiveBuffer() {
     // update the active buffer
     mPreviousBufferId = getCurrentBufferId();
     mBufferInfo.mBuffer =
             mConsumer->getCurrentBuffer(&mBufferInfo.mBufferSlot, &mBufferInfo.mFence);

     if (mBufferInfo.mBuffer == 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;
 }

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

 void BufferQueueLayer::onFrameDequeued(const uint64_t bufferId) {
     const int32_t layerId = getSequence();
     mFlinger->mFrameTracer->traceNewLayer(layerId, getName().c_str());
     mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
                                            systemTime(), FrameTracer::FrameEvent::DEQUEUE);
 }

 void BufferQueueLayer::onFrameDetached(const uint64_t bufferId) {
     const int32_t layerId = getSequence();
     mFlinger->mFrameTracer->traceNewLayer(layerId, getName().c_str());
     mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
                                            systemTime(), FrameTracer::FrameEvent::DETACH);
 }

 void BufferQueueLayer::onFrameCancelled(const uint64_t bufferId) {
     const int32_t layerId = getSequence();
     mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
                                            systemTime(), FrameTracer::FrameEvent::CANCEL);
 }

 void BufferQueueLayer::onFrameAvailable(const BufferItem& item) {
     const int32_t layerId = getSequence();
     const uint64_t bufferId = item.mGraphicBuffer->getId();
     mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, item.mFrameNumber, systemTime(),
                                            FrameTracer::FrameEvent::QUEUE);
     mFlinger->mFrameTracer->traceFence(layerId, bufferId, item.mFrameNumber,
                                        std::make_shared<FenceTime>(item.mFence),
                                        FrameTracer::FrameEvent::ACQUIRE_FENCE);

     ATRACE_CALL();
     // Add this buffer from our internal queue tracker
     { // Autolock scope
         const nsecs_t presentTime = item.mIsAutoTimestamp ? 0 : item.mTimestamp;
         mFlinger->mScheduler->recordLayerHistory(this, presentTime,
                                                  LayerHistory::LayerUpdateType::Buffer);

         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", getDebugName());
                 break;
             }
         }

         mQueueItems.push_back(item);
         mQueuedFrames++;

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

     mFlinger->mInterceptor->saveBufferUpdate(layerId, item.mGraphicBuffer->getWidth(),
                                              item.mGraphicBuffer->getHeight(), item.mFrameNumber);

     mFlinger->signalLayerUpdate();
     mConsumer->onBufferAvailable(item);
 }

 void BufferQueueLayer::onFrameReplaced(const BufferItem& item) {
     ATRACE_CALL();
     { // 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", getDebugName());
                 break;
             }
         }

         if (!hasFrameUpdate()) {
             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();
     }

     const int32_t layerId = getSequence();
     const uint64_t bufferId = item.mGraphicBuffer->getId();
     mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, item.mFrameNumber, systemTime(),
                                            FrameTracer::FrameEvent::QUEUE);
     mFlinger->mFrameTracer->traceFence(layerId, bufferId, item.mFrameNumber,
                                        std::make_shared<FenceTime>(item.mFence),
                                        FrameTracer::FrameEvent::ACQUIRE_FENCE);
     mConsumer->onBufferAvailable(item);
 }

 void BufferQueueLayer::onSidebandStreamChanged() {
     bool sidebandStreamChanged = false;
     if (mSidebandStreamChanged.compare_exchange_strong(sidebandStreamChanged, true)) {
         // mSidebandStreamChanged was changed to true
         mFlinger->signalLayerUpdate();
     }
 }

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

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

     // Creates a custom BufferQueue for SurfaceFlingerConsumer to use
     sp<IGraphicBufferProducer> producer;
     sp<IGraphicBufferConsumer> consumer;
     mFlinger->getFactory().createBufferQueue(&producer, &consumer, true);
     mProducer = mFlinger->getFactory().createMonitoredProducer(producer, mFlinger, this);
     mConsumer =
             mFlinger->getFactory().createBufferLayerConsumer(consumer, mFlinger->getRenderEngine(),
                                                              mTextureName, this);
     mConsumer->setConsumerUsageBits(getEffectiveUsage(0));

     mContentsChangedListener = new ContentsChangedListener(this);
     mConsumer->setContentsChangedListener(mContentsChangedListener);
     mConsumer->setName(String8(mName.data(), mName.size()));

     // BufferQueueCore::mMaxDequeuedBufferCount is default to 1
     if (!mFlinger->isLayerTripleBufferingDisabled()) {
         mProducer->setMaxDequeuedBufferCount(2);
     }
 }

 status_t BufferQueueLayer::setDefaultBufferProperties(uint32_t w, uint32_t h, PixelFormat format) {
     uint32_t const maxSurfaceDims =
           std::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;
     }

     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);
 }

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

     mBufferInfo.mDesiredPresentTime = mConsumer->getTimestamp();
     mBufferInfo.mFenceTime = mConsumer->getCurrentFenceTime();
     mBufferInfo.mFence = mConsumer->getCurrentFence();
     mBufferInfo.mTransform = mConsumer->getCurrentTransform();
     mBufferInfo.mDataspace = translateDataspace(mConsumer->getCurrentDataSpace());
     mBufferInfo.mCrop = mConsumer->getCurrentCrop();
     mBufferInfo.mScaleMode = mConsumer->getCurrentScalingMode();
     mBufferInfo.mSurfaceDamage = mConsumer->getSurfaceDamage();
     mBufferInfo.mHdrMetadata = mConsumer->getCurrentHdrMetadata();
     mBufferInfo.mApi = mConsumer->getCurrentApi();
     mBufferInfo.mTransformToDisplayInverse = mConsumer->getTransformToDisplayInverse();
 }

 sp<Layer> BufferQueueLayer::createClone() {
     LayerCreationArgs args(mFlinger.get(), nullptr, mName + " (Mirror)", 0, 0, 0, LayerMetadata());
     args.textureName = mTextureName;
     sp<BufferQueueLayer> layer = mFlinger->getFactory().createBufferQueueLayer(args);
     layer->setInitialValuesForClone(this);

     return layer;
 }

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

 void BufferQueueLayer::ContentsChangedListener::onFrameAvailable(const BufferItem& item) {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onFrameAvailable(item);
     }
 }

 void BufferQueueLayer::ContentsChangedListener::onFrameReplaced(const BufferItem& item) {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onFrameReplaced(item);
     }
 }

 void BufferQueueLayer::ContentsChangedListener::onSidebandStreamChanged() {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onSidebandStreamChanged();
     }
 }

 void BufferQueueLayer::ContentsChangedListener::onFrameDequeued(const uint64_t bufferId) {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onFrameDequeued(bufferId);
     }
 }

 void BufferQueueLayer::ContentsChangedListener::onFrameDetached(const uint64_t bufferId) {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onFrameDetached(bufferId);
     }
 }

 void BufferQueueLayer::ContentsChangedListener::onFrameCancelled(const uint64_t bufferId) {
     Mutex::Autolock lock(mMutex);
     if (mBufferQueueLayer != nullptr) {
         mBufferQueueLayer->onFrameCancelled(bufferId);
     }
 }

 void BufferQueueLayer::ContentsChangedListener::abandon() {
     Mutex::Autolock lock(mMutex);
     mBufferQueueLayer = nullptr;
 }

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

 } // namespace android

 // TODO(b/129481165): remove the #pragma below and fix conversion issues
 #pragma clang diagnostic pop // ignored "-Wconversion"
	/*
	* 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.
	*/

	// TODO(b/129481165): remove the #pragma below and fix conversion issues
	#pragma clang diagnostic push
	#pragma clang diagnostic ignored "-Wconversion"

	#undef LOG_TAG
	#define LOG_TAG "BufferQueueLayer"
	#define ATRACE_TAG ATRACE_TAG_GRAPHICS
	#include "BufferQueueLayer.h"

	#include <compositionengine/LayerFECompositionState.h>
	#include <gui/BufferQueueConsumer.h>
	#include <system/window.h>

	#include "LayerRejecter.h"
	#include "SurfaceInterceptor.h"

	#include "FrameTracer/FrameTracer.h"
	#include "Scheduler/LayerHistory.h"
	#include "TimeStats/TimeStats.h"

	namespace android {

	BufferQueueLayer::BufferQueueLayer(const LayerCreationArgs& args) : BufferLayer(args) {}

	BufferQueueLayer::~BufferQueueLayer() {
	mContentsChangedListener->abandon();
	mConsumer->abandon();
	}

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

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

	// Prevent tracing the same release multiple times.
	if (mPreviousFrameNumber != mPreviousReleasedFrameNumber) {
	mFlinger->mFrameTracer->traceFence(getSequence(), mPreviousBufferId, mPreviousFrameNumber,
	std::make_shared<FenceTime>(releaseFence),
	FrameTracer::FrameEvent::RELEASE_FENCE);
	mPreviousReleasedFrameNumber = mPreviousFrameNumber;
	}
	}

	void BufferQueueLayer::setTransformHint(ui::Transform::RotationFlags displayTransformHint) {
	BufferLayer::setTransformHint(displayTransformHint);
	mConsumer->setTransformHint(mTransformHint);
	}

	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)", getDebugName(), result);
	return {};
	}
	return history;
	}

	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(nsecs_t expectedPresentTime) const {
	if (getSidebandStreamChanged() \|\| getAutoRefresh()) {
	return true;
	}

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

	Mutex::Autolock lock(mQueueItemLock);

	const int64_t addedTime = mQueueItems[0].mTimestamp;

	// 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,
	getDebugName(), addedTime, expectedPresentTime);

	if (!isPlausible) {
	mFlinger->mTimeStats->incrementBadDesiredPresent(getSequence());
	}

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

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

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

	if (!hasFrameUpdate()) {
	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;
	}
	const bool fenceSignaled =
	mQueueItems[0].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
	if (!fenceSignaled) {
	mFlinger->mTimeStats->incrementLatchSkipped(getSequence(),
	TimeStats::LatchSkipReason::LateAcquire);
	}

	return fenceSignaled;
	}

	bool BufferQueueLayer::framePresentTimeIsCurrent(nsecs_t expectedPresentTime) const {
	if (!hasFrameUpdate() \|\| isRemovedFromCurrentState()) {
	return true;
	}

	Mutex::Autolock lock(mQueueItemLock);
	return mQueueItems[0].mTimestamp <= expectedPresentTime;
	}

	uint64_t BufferQueueLayer::getFrameNumber(nsecs_t expectedPresentTime) const {
	Mutex::Autolock lock(mQueueItemLock);
	uint64_t frameNumber = mQueueItems[0].mFrameNumber;

	// The head of the queue will be dropped if there are signaled and timely frames behind it
	if (isRemovedFromCurrentState()) {
	expectedPresentTime = 0;
	}

	for (int i = 1; i < mQueueItems.size(); i++) {
	const bool fenceSignaled =
	mQueueItems[i].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
	if (!fenceSignaled) {
	break;
	}

	// We don't drop frames without explicit timestamps
	if (mQueueItems[i].mIsAutoTimestamp) {
	break;
	}

	const nsecs_t desiredPresent = mQueueItems[i].mTimestamp;
	if (desiredPresent < expectedPresentTime - BufferQueueConsumer::MAX_REASONABLE_NSEC \|\|
	desiredPresent > expectedPresentTime) {
	break;
	}

	frameNumber = mQueueItems[i].mFrameNumber;
	}

	return frameNumber;
	}

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

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

	bool BufferQueueLayer::latchSidebandStream(bool& recomputeVisibleRegions) {
	bool sidebandStreamChanged = true;
	if (mSidebandStreamChanged.compare_exchange_strong(sidebandStreamChanged, false)) {
	// mSidebandStreamChanged was changed to false
	mSidebandStream = mConsumer->getSidebandStream();
	auto* layerCompositionState = editCompositionState();
	layerCompositionState->sidebandStream = mSidebandStream;
	if (layerCompositionState->sidebandStream != nullptr) {
	setTransactionFlags(eTransactionNeeded);
	mFlinger->setTransactionFlags(eTraversalNeeded);
	}
	recomputeVisibleRegions = true;

	return true;
	}
	return false;
	}

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

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

	status_t BufferQueueLayer::updateTexImage(bool& recomputeVisibleRegions, nsecs_t latchTime,
	nsecs_t expectedPresentTime) {
	// 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;
	const int32_t layerId = getSequence();
	LayerRejecter r(mDrawingState, getCurrentState(), recomputeVisibleRegions,
	getProducerStickyTransform() != 0, mName, mOverrideScalingMode,
	getTransformToDisplayInverse());

	if (isRemovedFromCurrentState()) {
	expectedPresentTime = 0;
	}

	// updateTexImage() below might drop the some buffers at the head of the queue if there is a
	// buffer behind them which is timely to be presented. However this buffer may not be signaled
	// yet. The code below makes sure that this wouldn't happen by setting maxFrameNumber to the
	// last buffer that was signaled.
	uint64_t lastSignaledFrameNumber = mLastFrameNumberReceived;
	{
	Mutex::Autolock lock(mQueueItemLock);
	for (int i = 0; i < mQueueItems.size(); i++) {
	bool fenceSignaled =
	mQueueItems[i].mFenceTime->getSignalTime() != Fence::SIGNAL_TIME_PENDING;
	if (!fenceSignaled) {
	break;
	}
	lastSignaledFrameNumber = mQueueItems[i].mFrameNumber;
	}
	}
	const uint64_t maxFrameNumberToAcquire =
	std::min(mLastFrameNumberReceived.load(), lastSignaledFrameNumber);

	status_t updateResult = mConsumer->updateTexImage(&r, expectedPresentTime, &mAutoRefresh,
	&queuedBuffer, maxFrameNumberToAcquire);
	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);
	mConsumer->mergeSurfaceDamage(mQueueItems[0].mSurfaceDamage);
	mFlinger->mTimeStats->removeTimeRecord(layerId, mQueueItems[0].mFrameNumber);
	mQueueItems.removeAt(0);
	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();
	mQueuedFrames = 0;
	mFlinger->mTimeStats->onDestroy(layerId);
	mFlinger->mFrameTracer->onDestroy(layerId);
	}

	// 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) {
	mConsumer->mergeSurfaceDamage(mQueueItems[0].mSurfaceDamage);
	mFlinger->mTimeStats->removeTimeRecord(layerId, mQueueItems[0].mFrameNumber);
	mQueueItems.removeAt(0);
	mQueuedFrames--;
	}

	uint64_t bufferID = mQueueItems[0].mGraphicBuffer->getId();
	mFlinger->mTimeStats->setLatchTime(layerId, currentFrameNumber, latchTime);
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferID, currentFrameNumber, latchTime,
	FrameTracer::FrameEvent::LATCH);

	mQueueItems.removeAt(0);
	}

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

	return NO_ERROR;
	}

	status_t BufferQueueLayer::updateActiveBuffer() {
	// update the active buffer
	mPreviousBufferId = getCurrentBufferId();
	mBufferInfo.mBuffer =
	mConsumer->getCurrentBuffer(&mBufferInfo.mBufferSlot, &mBufferInfo.mFence);

	if (mBufferInfo.mBuffer == 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;
	}

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

	void BufferQueueLayer::onFrameDequeued(const uint64_t bufferId) {
	const int32_t layerId = getSequence();
	mFlinger->mFrameTracer->traceNewLayer(layerId, getName().c_str());
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
	systemTime(), FrameTracer::FrameEvent::DEQUEUE);
	}

	void BufferQueueLayer::onFrameDetached(const uint64_t bufferId) {
	const int32_t layerId = getSequence();
	mFlinger->mFrameTracer->traceNewLayer(layerId, getName().c_str());
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
	systemTime(), FrameTracer::FrameEvent::DETACH);
	}

	void BufferQueueLayer::onFrameCancelled(const uint64_t bufferId) {
	const int32_t layerId = getSequence();
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, FrameTracer::UNSPECIFIED_FRAME_NUMBER,
	systemTime(), FrameTracer::FrameEvent::CANCEL);
	}

	void BufferQueueLayer::onFrameAvailable(const BufferItem& item) {
	const int32_t layerId = getSequence();
	const uint64_t bufferId = item.mGraphicBuffer->getId();
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, item.mFrameNumber, systemTime(),
	FrameTracer::FrameEvent::QUEUE);
	mFlinger->mFrameTracer->traceFence(layerId, bufferId, item.mFrameNumber,
	std::make_shared<FenceTime>(item.mFence),
	FrameTracer::FrameEvent::ACQUIRE_FENCE);

	ATRACE_CALL();
	// Add this buffer from our internal queue tracker
	{ // Autolock scope
	const nsecs_t presentTime = item.mIsAutoTimestamp ? 0 : item.mTimestamp;
	mFlinger->mScheduler->recordLayerHistory(this, presentTime,
	LayerHistory::LayerUpdateType::Buffer);

	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", getDebugName());
	break;
	}
	}

	mQueueItems.push_back(item);
	mQueuedFrames++;

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

	mFlinger->mInterceptor->saveBufferUpdate(layerId, item.mGraphicBuffer->getWidth(),
	item.mGraphicBuffer->getHeight(), item.mFrameNumber);

	mFlinger->signalLayerUpdate();
	mConsumer->onBufferAvailable(item);
	}

	void BufferQueueLayer::onFrameReplaced(const BufferItem& item) {
	ATRACE_CALL();
	{ // 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", getDebugName());
	break;
	}
	}

	if (!hasFrameUpdate()) {
	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();
	}

	const int32_t layerId = getSequence();
	const uint64_t bufferId = item.mGraphicBuffer->getId();
	mFlinger->mFrameTracer->traceTimestamp(layerId, bufferId, item.mFrameNumber, systemTime(),
	FrameTracer::FrameEvent::QUEUE);
	mFlinger->mFrameTracer->traceFence(layerId, bufferId, item.mFrameNumber,
	std::make_shared<FenceTime>(item.mFence),
	FrameTracer::FrameEvent::ACQUIRE_FENCE);
	mConsumer->onBufferAvailable(item);
	}

	void BufferQueueLayer::onSidebandStreamChanged() {
	bool sidebandStreamChanged = false;
	if (mSidebandStreamChanged.compare_exchange_strong(sidebandStreamChanged, true)) {
	// mSidebandStreamChanged was changed to true
	mFlinger->signalLayerUpdate();
	}
	}

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

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

	// Creates a custom BufferQueue for SurfaceFlingerConsumer to use
	sp<IGraphicBufferProducer> producer;
	sp<IGraphicBufferConsumer> consumer;
	mFlinger->getFactory().createBufferQueue(&producer, &consumer, true);
	mProducer = mFlinger->getFactory().createMonitoredProducer(producer, mFlinger, this);
	mConsumer =
	mFlinger->getFactory().createBufferLayerConsumer(consumer, mFlinger->getRenderEngine(),
	mTextureName, this);
	mConsumer->setConsumerUsageBits(getEffectiveUsage(0));

	mContentsChangedListener = new ContentsChangedListener(this);
	mConsumer->setContentsChangedListener(mContentsChangedListener);
	mConsumer->setName(String8(mName.data(), mName.size()));

	// BufferQueueCore::mMaxDequeuedBufferCount is default to 1
	if (!mFlinger->isLayerTripleBufferingDisabled()) {
	mProducer->setMaxDequeuedBufferCount(2);
	}
	}

	status_t BufferQueueLayer::setDefaultBufferProperties(uint32_t w, uint32_t h, PixelFormat format) {
	uint32_t const maxSurfaceDims =
	std::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;
	}

	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);
	}

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

	mBufferInfo.mDesiredPresentTime = mConsumer->getTimestamp();
	mBufferInfo.mFenceTime = mConsumer->getCurrentFenceTime();
	mBufferInfo.mFence = mConsumer->getCurrentFence();
	mBufferInfo.mTransform = mConsumer->getCurrentTransform();
	mBufferInfo.mDataspace = translateDataspace(mConsumer->getCurrentDataSpace());
	mBufferInfo.mCrop = mConsumer->getCurrentCrop();
	mBufferInfo.mScaleMode = mConsumer->getCurrentScalingMode();
	mBufferInfo.mSurfaceDamage = mConsumer->getSurfaceDamage();
	mBufferInfo.mHdrMetadata = mConsumer->getCurrentHdrMetadata();
	mBufferInfo.mApi = mConsumer->getCurrentApi();
	mBufferInfo.mTransformToDisplayInverse = mConsumer->getTransformToDisplayInverse();
	}

	sp<Layer> BufferQueueLayer::createClone() {
	LayerCreationArgs args(mFlinger.get(), nullptr, mName + " (Mirror)", 0, 0, 0, LayerMetadata());
	args.textureName = mTextureName;
	sp<BufferQueueLayer> layer = mFlinger->getFactory().createBufferQueueLayer(args);
	layer->setInitialValuesForClone(this);

	return layer;
	}

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

	void BufferQueueLayer::ContentsChangedListener::onFrameAvailable(const BufferItem& item) {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onFrameAvailable(item);
	}
	}

	void BufferQueueLayer::ContentsChangedListener::onFrameReplaced(const BufferItem& item) {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onFrameReplaced(item);
	}
	}

	void BufferQueueLayer::ContentsChangedListener::onSidebandStreamChanged() {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onSidebandStreamChanged();
	}
	}

	void BufferQueueLayer::ContentsChangedListener::onFrameDequeued(const uint64_t bufferId) {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onFrameDequeued(bufferId);
	}
	}

	void BufferQueueLayer::ContentsChangedListener::onFrameDetached(const uint64_t bufferId) {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onFrameDetached(bufferId);
	}
	}

	void BufferQueueLayer::ContentsChangedListener::onFrameCancelled(const uint64_t bufferId) {
	Mutex::Autolock lock(mMutex);
	if (mBufferQueueLayer != nullptr) {
	mBufferQueueLayer->onFrameCancelled(bufferId);
	}
	}

	void BufferQueueLayer::ContentsChangedListener::abandon() {
	Mutex::Autolock lock(mMutex);
	mBufferQueueLayer = nullptr;
	}

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

	} // namespace android

	// TODO(b/129481165): remove the #pragma below and fix conversion issues
	#pragma clang diagnostic pop // ignored "-Wconversion"