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diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
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+/*
+ * Copyright (C) 2017 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.
+ */
+
+//#define LOG_NDEBUG 0
+#undef LOG_TAG
+#define LOG_TAG "BufferStateLayer"
+#define ATRACE_TAG ATRACE_TAG_GRAPHICS
+
+#include <limits>
+
+#include <compositionengine/Display.h>
+#include <compositionengine/Layer.h>
+#include <compositionengine/OutputLayer.h>
+#include <compositionengine/impl/LayerCompositionState.h>
+#include <compositionengine/impl/OutputLayerCompositionState.h>
+#include <gui/BufferQueue.h>
+#include <private/gui/SyncFeatures.h>
+#include <renderengine/Image.h>
+
+#include "BufferStateLayer.h"
+#include "ColorLayer.h"
+#include "TimeStats/TimeStats.h"
+
+namespace android {
+
+// clang-format off
+const std::array<float, 16> BufferStateLayer::IDENTITY_MATRIX{
+ 1, 0, 0, 0,
+ 0, 1, 0, 0,
+ 0, 0, 1, 0,
+ 0, 0, 0, 1
+};
+// clang-format on
+
+BufferStateLayer::BufferStateLayer(const LayerCreationArgs& args)
+ : BufferLayer(args), mHwcSlotGenerator(new HwcSlotGenerator()) {
+ mOverrideScalingMode = NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
+ mCurrentState.dataspace = ui::Dataspace::V0_SRGB;
+}
+BufferStateLayer::~BufferStateLayer() {
+ if (mActiveBuffer != nullptr) {
+ auto& engine(mFlinger->getRenderEngine());
+ engine.unbindExternalTextureBuffer(mActiveBuffer->getId());
+ }
+}
+
+// -----------------------------------------------------------------------
+// Interface implementation for Layer
+// -----------------------------------------------------------------------
+void BufferStateLayer::onLayerDisplayed(const sp<Fence>& releaseFence) {
+ // The previous release fence notifies the client that SurfaceFlinger is done with the previous
+ // buffer that was presented on this layer. The first transaction that came in this frame that
+ // replaced the previous buffer on this layer needs this release fence, because the fence will
+ // let the client know when that previous buffer is removed from the screen.
+ //
+ // Every other transaction on this layer does not need a release fence because no other
+ // Transactions that were set on this layer this frame are going to have their preceeding buffer
+ // removed from the display this frame.
+ //
+ // For example, if we have 3 transactions this frame. The first transaction doesn't contain a
+ // buffer so it doesn't need a previous release fence because the layer still needs the previous
+ // buffer. The second transaction contains a buffer so it needs a previous release fence because
+ // the previous buffer will be released this frame. The third transaction also contains a
+ // buffer. It replaces the buffer in the second transaction. The buffer in the second
+ // transaction will now no longer be presented so it is released immediately and the third
+ // transaction doesn't need a previous release fence.
+ for (auto& handle : mDrawingState.callbackHandles) {
+ if (handle->releasePreviousBuffer) {
+ handle->previousReleaseFence = releaseFence;
+ break;
+ }
+ }
+}
+
+void BufferStateLayer::setTransformHint(uint32_t /*orientation*/) const {
+ // TODO(marissaw): send the transform hint to buffer owner
+ return;
+}
+
+void BufferStateLayer::releasePendingBuffer(nsecs_t /*dequeueReadyTime*/) {
+ mFlinger->getTransactionCompletedThread().addPresentedCallbackHandles(
+ mDrawingState.callbackHandles);
+
+ mDrawingState.callbackHandles = {};
+}
+
+bool BufferStateLayer::shouldPresentNow(nsecs_t /*expectedPresentTime*/) const {
+ if (getSidebandStreamChanged() || getAutoRefresh()) {
+ return true;
+ }
+
+ return hasFrameUpdate();
+}
+
+bool BufferStateLayer::willPresentCurrentTransaction() const {
+ // Returns true if the most recent Transaction applied to CurrentState will be presented.
+ return getSidebandStreamChanged() || getAutoRefresh() ||
+ (mCurrentState.modified &&
+ (mCurrentState.buffer != nullptr || mCurrentState.bgColorLayer != nullptr));
+}
+
+bool BufferStateLayer::getTransformToDisplayInverse() const {
+ return mCurrentState.transformToDisplayInverse;
+}
+
+void BufferStateLayer::pushPendingState() {
+ if (!mCurrentState.modified) {
+ return;
+ }
+ mPendingStates.push_back(mCurrentState);
+ ATRACE_INT(mTransactionName.string(), mPendingStates.size());
+}
+
+bool BufferStateLayer::applyPendingStates(Layer::State* stateToCommit) {
+ const bool stateUpdateAvailable = !mPendingStates.empty();
+ while (!mPendingStates.empty()) {
+ popPendingState(stateToCommit);
+ }
+ mCurrentStateModified = stateUpdateAvailable && mCurrentState.modified;
+ mCurrentState.modified = false;
+ return stateUpdateAvailable;
+}
+
+// Crop that applies to the window
+Rect BufferStateLayer::getCrop(const Layer::State& /*s*/) const {
+ return Rect::INVALID_RECT;
+}
+
+bool BufferStateLayer::setTransform(uint32_t transform) {
+ if (mCurrentState.transform == transform) return false;
+ mCurrentState.transform = transform;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setTransformToDisplayInverse(bool transformToDisplayInverse) {
+ if (mCurrentState.transformToDisplayInverse == transformToDisplayInverse) return false;
+ mCurrentState.sequence++;
+ mCurrentState.transformToDisplayInverse = transformToDisplayInverse;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setCrop(const Rect& crop) {
+ Rect c = crop;
+ if (c.left < 0) {
+ c.left = 0;
+ }
+ if (c.top < 0) {
+ c.top = 0;
+ }
+ // If the width and/or height are < 0, make it [0, 0, -1, -1] so the equality comparision below
+ // treats all invalid rectangles the same.
+ if (!c.isValid()) {
+ c.makeInvalid();
+ }
+
+ if (mCurrentState.crop == c) return false;
+ mCurrentState.crop = c;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setFrame(const Rect& frame) {
+ int x = frame.left;
+ int y = frame.top;
+ int w = frame.getWidth();
+ int h = frame.getHeight();
+
+ if (x < 0) {
+ x = 0;
+ w = frame.right;
+ }
+
+ if (y < 0) {
+ y = 0;
+ h = frame.bottom;
+ }
+
+ if (mCurrentState.active.transform.tx() == x && mCurrentState.active.transform.ty() == y &&
+ mCurrentState.active.w == w && mCurrentState.active.h == h) {
+ return false;
+ }
+
+ if (!frame.isValid()) {
+ x = y = w = h = 0;
+ }
+ mCurrentState.active.transform.set(x, y);
+ mCurrentState.active.w = w;
+ mCurrentState.active.h = h;
+
+ mCurrentState.sequence++;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setBuffer(const sp<GraphicBuffer>& buffer, nsecs_t postTime,
+ nsecs_t desiredPresentTime, const client_cache_t& clientCacheId) {
+ if (mCurrentState.buffer) {
+ mReleasePreviousBuffer = true;
+ }
+
+ mCurrentState.buffer = buffer;
+ mCurrentState.clientCacheId = clientCacheId;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+
+ mFlinger->mTimeStats->setPostTime(getSequence(), getFrameNumber(), getName().c_str(), postTime);
+ mDesiredPresentTime = desiredPresentTime;
+
+ if (mFlinger->mUseSmart90ForVideo) {
+ const nsecs_t presentTime = (mDesiredPresentTime == -1) ? 0 : mDesiredPresentTime;
+ mFlinger->mScheduler->addLayerPresentTimeAndHDR(mSchedulerLayerHandle, presentTime,
+ mCurrentState.hdrMetadata.validTypes != 0);
+ }
+
+ return true;
+}
+
+bool BufferStateLayer::setAcquireFence(const sp<Fence>& fence) {
+ // The acquire fences of BufferStateLayers have already signaled before they are set
+ mCallbackHandleAcquireTime = fence->getSignalTime();
+
+ mCurrentState.acquireFence = fence;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setDataspace(ui::Dataspace dataspace) {
+ if (mCurrentState.dataspace == dataspace) return false;
+ mCurrentState.dataspace = dataspace;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setHdrMetadata(const HdrMetadata& hdrMetadata) {
+ if (mCurrentState.hdrMetadata == hdrMetadata) return false;
+ mCurrentState.hdrMetadata = hdrMetadata;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setSurfaceDamageRegion(const Region& surfaceDamage) {
+ mCurrentState.surfaceDamageRegion = surfaceDamage;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setApi(int32_t api) {
+ if (mCurrentState.api == api) return false;
+ mCurrentState.api = api;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+bool BufferStateLayer::setSidebandStream(const sp<NativeHandle>& sidebandStream) {
+ if (mCurrentState.sidebandStream == sidebandStream) return false;
+ mCurrentState.sidebandStream = sidebandStream;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+
+ if (!mSidebandStreamChanged.exchange(true)) {
+ // mSidebandStreamChanged was false
+ mFlinger->signalLayerUpdate();
+ }
+ return true;
+}
+
+bool BufferStateLayer::setTransactionCompletedListeners(
+ const std::vector<sp<CallbackHandle>>& handles) {
+ // If there is no handle, we will not send a callback so reset mReleasePreviousBuffer and return
+ if (handles.empty()) {
+ mReleasePreviousBuffer = false;
+ return false;
+ }
+
+ const bool willPresent = willPresentCurrentTransaction();
+
+ for (const auto& handle : handles) {
+ // If this transaction set a buffer on this layer, release its previous buffer
+ handle->releasePreviousBuffer = mReleasePreviousBuffer;
+
+ // If this layer will be presented in this frame
+ if (willPresent) {
+ // If this transaction set an acquire fence on this layer, set its acquire time
+ handle->acquireTime = mCallbackHandleAcquireTime;
+
+ // Notify the transaction completed thread that there is a pending latched callback
+ // handle
+ mFlinger->getTransactionCompletedThread().registerPendingCallbackHandle(handle);
+
+ // Store so latched time and release fence can be set
+ mCurrentState.callbackHandles.push_back(handle);
+
+ } else { // If this layer will NOT need to be relatched and presented this frame
+ // Notify the transaction completed thread this handle is done
+ mFlinger->getTransactionCompletedThread().addUnpresentedCallbackHandle(handle);
+ }
+ }
+
+ mReleasePreviousBuffer = false;
+ mCallbackHandleAcquireTime = -1;
+
+ return willPresent;
+}
+
+bool BufferStateLayer::setTransparentRegionHint(const Region& transparent) {
+ mCurrentState.transparentRegionHint = transparent;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+ return true;
+}
+
+Rect BufferStateLayer::getBufferSize(const State& s) const {
+ // for buffer state layers we use the display frame size as the buffer size.
+ if (getActiveWidth(s) < UINT32_MAX && getActiveHeight(s) < UINT32_MAX) {
+ return Rect(getActiveWidth(s), getActiveHeight(s));
+ }
+
+ // if the display frame is not defined, use the parent bounds as the buffer size.
+ const auto& p = mDrawingParent.promote();
+ if (p != nullptr) {
+ Rect parentBounds = Rect(p->getBounds(Region()));
+ if (!parentBounds.isEmpty()) {
+ return parentBounds;
+ }
+ }
+
+ return Rect::INVALID_RECT;
+}
+
+FloatRect BufferStateLayer::computeSourceBounds(const FloatRect& parentBounds) const {
+ const State& s(getDrawingState());
+ // for buffer state layers we use the display frame size as the buffer size.
+ if (getActiveWidth(s) < UINT32_MAX && getActiveHeight(s) < UINT32_MAX) {
+ return FloatRect(0, 0, getActiveWidth(s), getActiveHeight(s));
+ }
+
+ // if the display frame is not defined, use the parent bounds as the buffer size.
+ return parentBounds;
+}
+
+// -----------------------------------------------------------------------
+
+// -----------------------------------------------------------------------
+// Interface implementation for BufferLayer
+// -----------------------------------------------------------------------
+bool BufferStateLayer::fenceHasSignaled() const {
+ if (latchUnsignaledBuffers()) {
+ return true;
+ }
+
+ return getDrawingState().acquireFence->getStatus() == Fence::Status::Signaled;
+}
+
+bool BufferStateLayer::framePresentTimeIsCurrent() const {
+ if (!hasFrameUpdate() || isRemovedFromCurrentState()) {
+ return true;
+ }
+
+ return mDesiredPresentTime <= mFlinger->mScheduler->expectedPresentTime();
+}
+
+nsecs_t BufferStateLayer::getDesiredPresentTime() {
+ return mDesiredPresentTime;
+}
+
+std::shared_ptr<FenceTime> BufferStateLayer::getCurrentFenceTime() const {
+ return std::make_shared<FenceTime>(getDrawingState().acquireFence);
+}
+
+void BufferStateLayer::getDrawingTransformMatrix(float *matrix) {
+ std::copy(std::begin(mTransformMatrix), std::end(mTransformMatrix), matrix);
+}
+
+uint32_t BufferStateLayer::getDrawingTransform() const {
+ return getDrawingState().transform;
+}
+
+ui::Dataspace BufferStateLayer::getDrawingDataSpace() const {
+ return getDrawingState().dataspace;
+}
+
+// Crop that applies to the buffer
+Rect BufferStateLayer::getDrawingCrop() const {
+ const State& s(getDrawingState());
+
+ if (s.crop.isEmpty() && s.buffer) {
+ return s.buffer->getBounds();
+ } else if (s.buffer) {
+ Rect crop = s.crop;
+ crop.left = std::max(crop.left, 0);
+ crop.top = std::max(crop.top, 0);
+ uint32_t bufferWidth = s.buffer->getWidth();
+ uint32_t bufferHeight = s.buffer->getHeight();
+ if (bufferHeight <= std::numeric_limits<int32_t>::max() &&
+ bufferWidth <= std::numeric_limits<int32_t>::max()) {
+ crop.right = std::min(crop.right, static_cast<int32_t>(bufferWidth));
+ crop.bottom = std::min(crop.bottom, static_cast<int32_t>(bufferHeight));
+ }
+ if (!crop.isValid()) {
+ // Crop rect is out of bounds, return whole buffer
+ return s.buffer->getBounds();
+ }
+ return crop;
+ }
+ return s.crop;
+}
+
+uint32_t BufferStateLayer::getDrawingScalingMode() const {
+ return NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
+}
+
+Region BufferStateLayer::getDrawingSurfaceDamage() const {
+ return getDrawingState().surfaceDamageRegion;
+}
+
+const HdrMetadata& BufferStateLayer::getDrawingHdrMetadata() const {
+ return getDrawingState().hdrMetadata;
+}
+
+int BufferStateLayer::getDrawingApi() const {
+ return getDrawingState().api;
+}
+
+PixelFormat BufferStateLayer::getPixelFormat() const {
+ if (!mActiveBuffer) {
+ return PIXEL_FORMAT_NONE;
+ }
+ return mActiveBuffer->format;
+}
+
+uint64_t BufferStateLayer::getFrameNumber() const {
+ return mFrameNumber;
+}
+
+bool BufferStateLayer::getAutoRefresh() const {
+ // TODO(marissaw): support shared buffer mode
+ return false;
+}
+
+bool BufferStateLayer::getSidebandStreamChanged() const {
+ return mSidebandStreamChanged.load();
+}
+
+bool BufferStateLayer::latchSidebandStream(bool& recomputeVisibleRegions) {
+ if (mSidebandStreamChanged.exchange(false)) {
+ const State& s(getDrawingState());
+ // mSidebandStreamChanged was true
+ LOG_ALWAYS_FATAL_IF(!getCompositionLayer());
+ mSidebandStream = s.sidebandStream;
+ getCompositionLayer()->editState().frontEnd.sidebandStream = mSidebandStream;
+ if (mSidebandStream != nullptr) {
+ setTransactionFlags(eTransactionNeeded);
+ mFlinger->setTransactionFlags(eTraversalNeeded);
+ }
+ recomputeVisibleRegions = true;
+
+ return true;
+ }
+ return false;
+}
+
+bool BufferStateLayer::hasFrameUpdate() const {
+ const State& c(getCurrentState());
+ return mCurrentStateModified && (c.buffer != nullptr || c.bgColorLayer != nullptr);
+}
+
+void BufferStateLayer::setFilteringEnabled(bool enabled) {
+ GLConsumer::computeTransformMatrix(mTransformMatrix.data(), mActiveBuffer, mCurrentCrop,
+ mCurrentTransform, enabled);
+}
+
+status_t BufferStateLayer::bindTextureImage() {
+ const State& s(getDrawingState());
+ auto& engine(mFlinger->getRenderEngine());
+
+ return engine.bindExternalTextureBuffer(mTextureName, s.buffer, s.acquireFence);
+}
+
+status_t BufferStateLayer::updateTexImage(bool& /*recomputeVisibleRegions*/, nsecs_t latchTime) {
+ const State& s(getDrawingState());
+
+ if (!s.buffer) {
+ if (s.bgColorLayer) {
+ for (auto& handle : mDrawingState.callbackHandles) {
+ handle->latchTime = latchTime;
+ }
+ }
+ return NO_ERROR;
+ }
+
+ const int32_t layerID = getSequence();
+
+ // Reject if the layer is invalid
+ uint32_t bufferWidth = s.buffer->width;
+ uint32_t bufferHeight = s.buffer->height;
+
+ if (s.transform & ui::Transform::ROT_90) {
+ std::swap(bufferWidth, bufferHeight);
+ }
+
+ if (s.transformToDisplayInverse) {
+ uint32_t invTransform = DisplayDevice::getPrimaryDisplayOrientationTransform();
+ if (invTransform & ui::Transform::ROT_90) {
+ std::swap(bufferWidth, bufferHeight);
+ }
+ }
+
+ if (getEffectiveScalingMode() == NATIVE_WINDOW_SCALING_MODE_FREEZE &&
+ (s.active.w != bufferWidth || s.active.h != bufferHeight)) {
+ ALOGE("[%s] rejecting buffer: "
+ "bufferWidth=%d, bufferHeight=%d, front.active.{w=%d, h=%d}",
+ mName.string(), bufferWidth, bufferHeight, s.active.w, s.active.h);
+ mFlinger->mTimeStats->removeTimeRecord(layerID, getFrameNumber());
+ return BAD_VALUE;
+ }
+
+ for (auto& handle : mDrawingState.callbackHandles) {
+ handle->latchTime = latchTime;
+ }
+
+ if (!SyncFeatures::getInstance().useNativeFenceSync()) {
+ // Bind the new buffer to the GL texture.
+ //
+ // Older devices require the "implicit" synchronization provided
+ // by glEGLImageTargetTexture2DOES, which this method calls. Newer
+ // devices will either call this in Layer::onDraw, or (if it's not
+ // a GL-composited layer) not at all.
+ status_t err = bindTextureImage();
+ if (err != NO_ERROR) {
+ mFlinger->mTimeStats->onDestroy(layerID);
+ return BAD_VALUE;
+ }
+ }
+
+ mFlinger->mTimeStats->setAcquireFence(layerID, getFrameNumber(), getCurrentFenceTime());
+ mFlinger->mTimeStats->setLatchTime(layerID, getFrameNumber(), latchTime);
+
+ mCurrentStateModified = false;
+
+ return NO_ERROR;
+}
+
+status_t BufferStateLayer::updateActiveBuffer() {
+ const State& s(getDrawingState());
+
+ if (s.buffer == nullptr) {
+ return BAD_VALUE;
+ }
+
+ if (mActiveBuffer != nullptr) {
+ // todo: get this to work with BufferStateLayerCache
+ auto& engine(mFlinger->getRenderEngine());
+ engine.unbindExternalTextureBuffer(mActiveBuffer->getId());
+ }
+ mActiveBuffer = s.buffer;
+ mActiveBufferFence = s.acquireFence;
+ auto& layerCompositionState = getCompositionLayer()->editState().frontEnd;
+ layerCompositionState.buffer = mActiveBuffer;
+ layerCompositionState.bufferSlot = 0;
+
+ return NO_ERROR;
+}
+
+status_t BufferStateLayer::updateFrameNumber(nsecs_t /*latchTime*/) {
+ // TODO(marissaw): support frame history events
+ mCurrentFrameNumber = mFrameNumber;
+ return NO_ERROR;
+}
+
+void BufferStateLayer::setHwcLayerBuffer(const sp<const DisplayDevice>& display) {
+ const auto outputLayer = findOutputLayerForDisplay(display);
+ LOG_FATAL_IF(!outputLayer || !outputLayer->getState().hwc);
+ auto& hwcInfo = *outputLayer->editState().hwc;
+ auto& hwcLayer = hwcInfo.hwcLayer;
+
+ const State& s(getDrawingState());
+
+ uint32_t hwcSlot;
+ sp<GraphicBuffer> buffer;
+ hwcInfo.hwcBufferCache.getHwcBuffer(mHwcSlotGenerator->getHwcCacheSlot(s.clientCacheId),
+ s.buffer, &hwcSlot, &buffer);
+
+ auto error = hwcLayer->setBuffer(hwcSlot, buffer, s.acquireFence);
+ if (error != HWC2::Error::None) {
+ ALOGE("[%s] Failed to set buffer %p: %s (%d)", mName.string(),
+ s.buffer->handle, to_string(error).c_str(), static_cast<int32_t>(error));
+ }
+
+ mFrameNumber++;
+}
+
+void BufferStateLayer::onFirstRef() {
+ BufferLayer::onFirstRef();
+
+ if (const auto display = mFlinger->getDefaultDisplayDevice()) {
+ updateTransformHint(display);
+ }
+}
+
+void BufferStateLayer::HwcSlotGenerator::bufferErased(const client_cache_t& clientCacheId) {
+ std::lock_guard lock(mMutex);
+ if (!clientCacheId.isValid()) {
+ ALOGE("invalid process, failed to erase buffer");
+ return;
+ }
+ eraseBufferLocked(clientCacheId);
+}
+
+uint32_t BufferStateLayer::HwcSlotGenerator::getHwcCacheSlot(const client_cache_t& clientCacheId) {
+ std::lock_guard<std::mutex> lock(mMutex);
+ auto itr = mCachedBuffers.find(clientCacheId);
+ if (itr == mCachedBuffers.end()) {
+ return addCachedBuffer(clientCacheId);
+ }
+ auto& [hwcCacheSlot, counter] = itr->second;
+ counter = mCounter++;
+ return hwcCacheSlot;
+}
+
+uint32_t BufferStateLayer::HwcSlotGenerator::addCachedBuffer(const client_cache_t& clientCacheId)
+ REQUIRES(mMutex) {
+ if (!clientCacheId.isValid()) {
+ ALOGE("invalid process, returning invalid slot");
+ return BufferQueue::INVALID_BUFFER_SLOT;
+ }
+
+ ClientCache::getInstance().registerErasedRecipient(clientCacheId, wp<ErasedRecipient>(this));
+
+ uint32_t hwcCacheSlot = getFreeHwcCacheSlot();
+ mCachedBuffers[clientCacheId] = {hwcCacheSlot, mCounter++};
+ return hwcCacheSlot;
+}
+
+uint32_t BufferStateLayer::HwcSlotGenerator::getFreeHwcCacheSlot() REQUIRES(mMutex) {
+ if (mFreeHwcCacheSlots.empty()) {
+ evictLeastRecentlyUsed();
+ }
+
+ uint32_t hwcCacheSlot = mFreeHwcCacheSlots.top();
+ mFreeHwcCacheSlots.pop();
+ return hwcCacheSlot;
+}
+
+void BufferStateLayer::HwcSlotGenerator::evictLeastRecentlyUsed() REQUIRES(mMutex) {
+ uint64_t minCounter = UINT_MAX;
+ client_cache_t minClientCacheId = {};
+ for (const auto& [clientCacheId, slotCounter] : mCachedBuffers) {
+ const auto& [hwcCacheSlot, counter] = slotCounter;
+ if (counter < minCounter) {
+ minCounter = counter;
+ minClientCacheId = clientCacheId;
+ }
+ }
+ eraseBufferLocked(minClientCacheId);
+
+ ClientCache::getInstance().unregisterErasedRecipient(minClientCacheId, this);
+}
+
+void BufferStateLayer::HwcSlotGenerator::eraseBufferLocked(const client_cache_t& clientCacheId)
+ REQUIRES(mMutex) {
+ auto itr = mCachedBuffers.find(clientCacheId);
+ if (itr == mCachedBuffers.end()) {
+ return;
+ }
+ auto& [hwcCacheSlot, counter] = itr->second;
+
+ // TODO send to hwc cache and resources
+
+ mFreeHwcCacheSlots.push(hwcCacheSlot);
+ mCachedBuffers.erase(clientCacheId);
+}
+} // namespace android