diff --git a/services/surfaceflinger/BufferQueueLayer.cpp b/services/surfaceflinger/BufferQueueLayer.cpp
new file mode 100644
index 0000000..d5a94b7
--- /dev/null
+++ b/services/surfaceflinger/BufferQueueLayer.cpp
@@ -0,0 +1,482 @@
+/*
+ * 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 = mCurrentState.active;
+}
+
+// -----------------------------------------------------------------------
+// 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[16]) const {
+    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.w, s.active.h)));
+    }
+    return {};
+}
+
+bool BufferQueueLayer::hasDrawingBuffer() const {
+    return mQueuedFrames > 0;
+}
+
+void BufferQueueLayer::setFilteringEnabled(bool enabled) const {
+    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() {
+    // 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