services/surfaceflinger/FrontEnd/LayerLifecycleManager.cpp - android_frameworks_native - Gitiles

 /*
  * Copyright 2022 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 ATRACE_TAG ATRACE_TAG_GRAPHICS

 #undef LOG_TAG
 #define LOG_TAG "LayerLifecycleManager"

 #include "LayerLifecycleManager.h"
 #include "Client.h" // temporarily needed for LayerCreationArgs
 #include "LayerLog.h"
 #include "SwapErase.h"

 namespace android::surfaceflinger::frontend {

 using namespace ftl::flag_operators;

 void LayerLifecycleManager::addLayers(std::vector<std::unique_ptr<RequestedLayerState>> newLayers) {
     if (newLayers.empty()) {
         return;
     }

     mGlobalChanges |= RequestedLayerState::Changes::Hierarchy;
     for (auto& newLayer : newLayers) {
         RequestedLayerState& layer = *newLayer.get();
         auto [it, inserted] = mIdToLayer.try_emplace(layer.id, References{.owner = layer});
         if (!inserted) {
             LOG_ALWAYS_FATAL("Duplicate layer id found. New layer: %s Existing layer: %s",
                              layer.getDebugString().c_str(),
                              it->second.owner.getDebugString().c_str());
         }
         mAddedLayers.push_back(newLayer.get());
         layer.parentId = linkLayer(layer.parentId, layer.id);
         layer.relativeParentId = linkLayer(layer.relativeParentId, layer.id);
         if (layer.layerStackToMirror != ui::INVALID_LAYER_STACK) {
             // if this layer is mirroring a display, then walk though all the existing root layers
             // for the layer stack and add them as children to be mirrored.
             mDisplayMirroringLayers.emplace_back(layer.id);
             for (auto& rootLayer : mLayers) {
                 if (rootLayer->isRoot() && rootLayer->layerStack == layer.layerStackToMirror) {
                     layer.mirrorIds.emplace_back(rootLayer->id);
                     linkLayer(rootLayer->id, layer.id);
                 }
             }
         } else {
             // Check if we are mirroring a single layer, and if so add it to the list of children
             // to be mirrored.
             layer.layerIdToMirror = linkLayer(layer.layerIdToMirror, layer.id);
             if (layer.layerIdToMirror != UNASSIGNED_LAYER_ID) {
                 layer.mirrorIds.emplace_back(layer.layerIdToMirror);
             }
         }
         layer.touchCropId = linkLayer(layer.touchCropId, layer.id);
         if (layer.isRoot()) {
             updateDisplayMirrorLayers(layer);
         }
         LLOGV(layer.id, "%s", layer.getDebugString().c_str());
         mLayers.emplace_back(std::move(newLayer));
     }
 }

 void LayerLifecycleManager::onHandlesDestroyed(const std::vector<uint32_t>& destroyedHandles,
                                                bool ignoreUnknownHandles) {
     std::vector<uint32_t> layersToBeDestroyed;
     for (const auto& layerId : destroyedHandles) {
         auto it = mIdToLayer.find(layerId);
         if (it == mIdToLayer.end()) {
             LOG_ALWAYS_FATAL_IF(!ignoreUnknownHandles, "%s Layerid not found %d", __func__,
                                 layerId);
             continue;
         }
         RequestedLayerState& layer = it->second.owner;
         LLOGV(layer.id, "%s", layer.getDebugString().c_str());
         layer.handleAlive = false;
         if (!layer.canBeDestroyed()) {
             continue;
         }
         layer.changes |= RequestedLayerState::Changes::Destroyed;
         layersToBeDestroyed.emplace_back(layerId);
     }

     if (layersToBeDestroyed.empty()) {
         return;
     }

     mGlobalChanges |= RequestedLayerState::Changes::Hierarchy;
     for (size_t i = 0; i < layersToBeDestroyed.size(); i++) {
         uint32_t layerId = layersToBeDestroyed[i];
         auto it = mIdToLayer.find(layerId);
         if (it == mIdToLayer.end()) {
             LOG_ALWAYS_FATAL("%s Layer with id %d not found", __func__, layerId);
             continue;
         }

         RequestedLayerState& layer = it->second.owner;

         layer.parentId = unlinkLayer(layer.parentId, layer.id);
         layer.relativeParentId = unlinkLayer(layer.relativeParentId, layer.id);
         if (layer.layerStackToMirror != ui::INVALID_LAYER_STACK) {
             layer.mirrorIds = unlinkLayers(layer.mirrorIds, layer.id);
             swapErase(mDisplayMirroringLayers, layer.id);
         } else {
             layer.layerIdToMirror = unlinkLayer(layer.layerIdToMirror, layer.id);
             layer.mirrorIds.clear();
         }

         layer.touchCropId = unlinkLayer(layer.touchCropId, layer.id);

         auto& references = it->second.references;
         for (uint32_t linkedLayerId : references) {
             RequestedLayerState* linkedLayer = getLayerFromId(linkedLayerId);
             if (!linkedLayer) {
                 LOG_ALWAYS_FATAL("%s Layerid reference %d not found for %d", __func__,
                                  linkedLayerId, layer.id);
                 continue;
             };
             if (linkedLayer->parentId == layer.id) {
                 linkedLayer->parentId = UNASSIGNED_LAYER_ID;
                 if (linkedLayer->canBeDestroyed()) {
                     linkedLayer->changes |= RequestedLayerState::Changes::Destroyed;
                     layersToBeDestroyed.emplace_back(linkedLayer->id);
                 }
             }
             if (linkedLayer->relativeParentId == layer.id) {
                 linkedLayer->relativeParentId = UNASSIGNED_LAYER_ID;
             }
             if (swapErase(linkedLayer->mirrorIds, layer.id)) {
                 linkedLayer->changes |= RequestedLayerState::Changes::Mirror;
             }
             if (linkedLayer->touchCropId == layer.id) {
                 linkedLayer->touchCropId = UNASSIGNED_LAYER_ID;
             }
         }
         mIdToLayer.erase(it);
     }

     auto it = mLayers.begin();
     while (it != mLayers.end()) {
         RequestedLayerState* layer = it->get();
         if (layer->changes.test(RequestedLayerState::Changes::Destroyed)) {
             LLOGV(layer->id, "destroyed %s", layer->getDebugStringShort().c_str());
             std::iter_swap(it, mLayers.end() - 1);
             mDestroyedLayers.emplace_back(std::move(mLayers.back()));
             if (it == mLayers.end() - 1) {
                 it = mLayers.erase(mLayers.end() - 1);
             } else {
                 mLayers.erase(mLayers.end() - 1);
             }
         } else {
             it++;
         }
     }
 }

 void LayerLifecycleManager::applyTransactions(const std::vector<TransactionState>& transactions,
                                               bool ignoreUnknownLayers) {
     for (const auto& transaction : transactions) {
         for (const auto& resolvedComposerState : transaction.states) {
             const auto& clientState = resolvedComposerState.state;
             uint32_t layerId = resolvedComposerState.layerId;
             if (layerId == UNASSIGNED_LAYER_ID) {
                 ALOGW("%s Handle %p is not valid", __func__, clientState.surface.get());
                 continue;
             }

             RequestedLayerState* layer = getLayerFromId(layerId);
             if (layer == nullptr) {
                 LOG_ALWAYS_FATAL_IF(!ignoreUnknownLayers, "%s Layer with layerid=%d not found",
                                     __func__, layerId);
                 continue;
             }

             if (!layer->handleAlive) {
                 LOG_ALWAYS_FATAL("%s Layer's with layerid=%d) is not alive. Possible out of "
                                  "order LayerLifecycleManager updates",
                                  __func__, layerId);
                 continue;
             }

             if (transaction.flags & ISurfaceComposer::eAnimation) {
                 layer->changes |= RequestedLayerState::Changes::Animation;
             }

             uint32_t oldParentId = layer->parentId;
             uint32_t oldRelativeParentId = layer->relativeParentId;
             uint32_t oldTouchCropId = layer->touchCropId;
             layer->merge(resolvedComposerState);

             if (layer->what & layer_state_t::eBackgroundColorChanged) {
                 if (layer->bgColorLayerId == UNASSIGNED_LAYER_ID && layer->bgColor.a != 0) {
                     LayerCreationArgs
                             backgroundLayerArgs(LayerCreationArgs::getInternalLayerId(
                                                         LayerCreationArgs::sInternalSequence++),
                                                 /*internalLayer=*/true);
                     backgroundLayerArgs.parentId = layer->id;
                     backgroundLayerArgs.name = layer->name + "BackgroundColorLayer";
                     backgroundLayerArgs.flags = ISurfaceComposerClient::eFXSurfaceEffect;
                     std::vector<std::unique_ptr<RequestedLayerState>> newLayers;
                     newLayers.emplace_back(
                             std::make_unique<RequestedLayerState>(backgroundLayerArgs));
                     RequestedLayerState* backgroundLayer = newLayers.back().get();
                     backgroundLayer->bgColorLayer = true;
                     backgroundLayer->handleAlive = false;
                     backgroundLayer->parentId = layer->id;
                     backgroundLayer->z = std::numeric_limits<int32_t>::min();
                     backgroundLayer->color = layer->bgColor;
                     backgroundLayer->dataspace = layer->bgColorDataspace;
                     layer->bgColorLayerId = backgroundLayer->id;
                     addLayers({std::move(newLayers)});
                 } else if (layer->bgColorLayerId != UNASSIGNED_LAYER_ID && layer->bgColor.a == 0) {
                     RequestedLayerState* bgColorLayer = getLayerFromId(layer->bgColorLayerId);
                     layer->bgColorLayerId = UNASSIGNED_LAYER_ID;
                     bgColorLayer->parentId = unlinkLayer(bgColorLayer->parentId, bgColorLayer->id);
                     onHandlesDestroyed({bgColorLayer->id});
                 } else if (layer->bgColorLayerId != UNASSIGNED_LAYER_ID) {
                     RequestedLayerState* bgColorLayer = getLayerFromId(layer->bgColorLayerId);
                     bgColorLayer->color = layer->bgColor;
                     bgColorLayer->dataspace = layer->bgColorDataspace;
                     bgColorLayer->what |= layer_state_t::eColorChanged |
                             layer_state_t::eDataspaceChanged | layer_state_t::eAlphaChanged;
                     bgColorLayer->changes |= RequestedLayerState::Changes::Content;
                     mGlobalChanges |= RequestedLayerState::Changes::Content;
                 }
             }

             if (oldParentId != layer->parentId) {
                 unlinkLayer(oldParentId, layer->id);
                 layer->parentId = linkLayer(layer->parentId, layer->id);
                 if (oldParentId == UNASSIGNED_LAYER_ID) {
                     updateDisplayMirrorLayers(*layer);
                 }
             }
             if (layer->what & layer_state_t::eLayerStackChanged && layer->isRoot()) {
                 updateDisplayMirrorLayers(*layer);
             }
             if (oldRelativeParentId != layer->relativeParentId) {
                 unlinkLayer(oldRelativeParentId, layer->id);
                 layer->relativeParentId = linkLayer(layer->relativeParentId, layer->id);
             }
             if (oldTouchCropId != layer->touchCropId) {
                 unlinkLayer(oldTouchCropId, layer->id);
                 layer->touchCropId = linkLayer(layer->touchCropId, layer->id);
             }

             mGlobalChanges |= layer->changes;
         }
     }
 }

 void LayerLifecycleManager::commitChanges() {
     for (auto layer : mAddedLayers) {
         for (auto& listener : mListeners) {
             listener->onLayerAdded(*layer);
         }
     }
     mAddedLayers.clear();

     for (auto& layer : mLayers) {
         layer->clearChanges();
     }

     for (auto& destroyedLayer : mDestroyedLayers) {
         for (auto& listener : mListeners) {
             listener->onLayerDestroyed(*destroyedLayer);
         }
     }
     mDestroyedLayers.clear();
     mGlobalChanges.clear();
 }

 void LayerLifecycleManager::addLifecycleListener(std::shared_ptr<ILifecycleListener> listener) {
     mListeners.emplace_back(std::move(listener));
 }

 void LayerLifecycleManager::removeLifecycleListener(std::shared_ptr<ILifecycleListener> listener) {
     swapErase(mListeners, listener);
 }

 const std::vector<std::unique_ptr<RequestedLayerState>>& LayerLifecycleManager::getLayers() const {
     return mLayers;
 }

 const std::vector<std::unique_ptr<RequestedLayerState>>& LayerLifecycleManager::getDestroyedLayers()
         const {
     return mDestroyedLayers;
 }

 const ftl::Flags<RequestedLayerState::Changes> LayerLifecycleManager::getGlobalChanges() const {
     return mGlobalChanges;
 }

 RequestedLayerState* LayerLifecycleManager::getLayerFromId(uint32_t id) {
     if (id == UNASSIGNED_LAYER_ID) {
         return nullptr;
     }
     auto it = mIdToLayer.find(id);
     if (it == mIdToLayer.end()) {
         return nullptr;
     }
     return &it->second.owner;
 }

 std::vector<uint32_t>* LayerLifecycleManager::getLinkedLayersFromId(uint32_t id) {
     if (id == UNASSIGNED_LAYER_ID) {
         return nullptr;
     }
     auto it = mIdToLayer.find(id);
     if (it == mIdToLayer.end()) {
         return nullptr;
     }
     return &it->second.references;
 }

 uint32_t LayerLifecycleManager::linkLayer(uint32_t layerId, uint32_t layerToLink) {
     if (layerId == UNASSIGNED_LAYER_ID) {
         return UNASSIGNED_LAYER_ID;
     }

     std::vector<uint32_t>* linkedLayers = getLinkedLayersFromId(layerId);
     if (!linkedLayers) {
         ALOGV("Could not find layer id %d to link %d. Parent is probably destroyed", layerId,
               layerToLink);
         return UNASSIGNED_LAYER_ID;
     }
     linkedLayers->emplace_back(layerToLink);
     return layerId;
 }

 uint32_t LayerLifecycleManager::unlinkLayer(uint32_t layerId, uint32_t linkedLayer) {
     std::vector<uint32_t>* linkedLayers = getLinkedLayersFromId(layerId);
     if (!linkedLayers) {
         return UNASSIGNED_LAYER_ID;
     }
     swapErase(*linkedLayers, linkedLayer);
     return UNASSIGNED_LAYER_ID;
 }

 std::vector<uint32_t> LayerLifecycleManager::unlinkLayers(const std::vector<uint32_t>& layerIds,
                                                           uint32_t linkedLayer) {
     for (uint32_t layerId : layerIds) {
         unlinkLayer(layerId, linkedLayer);
     }
     return {};
 }

 std::string LayerLifecycleManager::References::getDebugString() const {
     std::string debugInfo = owner.name + "[" + std::to_string(owner.id) + "] refs:";
     std::for_each(references.begin(), references.end(),
                   [&debugInfo = debugInfo](const uint32_t& reference) mutable {
                       debugInfo += std::to_string(reference) + ",";
                   });
     return debugInfo;
 }

 void LayerLifecycleManager::fixRelativeZLoop(uint32_t relativeRootId) {
     auto it = mIdToLayer.find(relativeRootId);
     if (it == mIdToLayer.end()) {
         return;
     }
     RequestedLayerState& layer = it->second.owner;
     layer.relativeParentId = unlinkLayer(layer.relativeParentId, layer.id);
     layer.changes |=
             RequestedLayerState::Changes::Hierarchy | RequestedLayerState::Changes::RelativeParent;
     mGlobalChanges |= RequestedLayerState::Changes::Hierarchy;
 }

 // Some layers mirror the entire display stack. Since we don't have a single root layer per display
 // we have to track all these layers and update what they mirror when the list of root layers
 // on a display changes. This function walks through the list of display mirroring layers
 // and updates its list of layers that its mirroring. This function should be called when a new
 // root layer is added, removed or moved to another display.
 void LayerLifecycleManager::updateDisplayMirrorLayers(RequestedLayerState& rootLayer) {
     for (uint32_t mirrorLayerId : mDisplayMirroringLayers) {
         RequestedLayerState* mirrorLayer = getLayerFromId(mirrorLayerId);
         bool canBeMirrored =
                 rootLayer.isRoot() && rootLayer.layerStack == mirrorLayer->layerStackToMirror;
         bool currentlyMirrored =
                 std::find(mirrorLayer->mirrorIds.begin(), mirrorLayer->mirrorIds.end(),
                           rootLayer.id) != mirrorLayer->mirrorIds.end();

         if (canBeMirrored && !currentlyMirrored) {
             mirrorLayer->mirrorIds.emplace_back(rootLayer.id);
             linkLayer(rootLayer.id, mirrorLayer->id);
             mirrorLayer->changes |= RequestedLayerState::Changes::Mirror;
         } else if (!canBeMirrored && currentlyMirrored) {
             swapErase(mirrorLayer->mirrorIds, rootLayer.id);
             unlinkLayer(rootLayer.id, mirrorLayer->id);
             mirrorLayer->changes |= RequestedLayerState::Changes::Mirror;
         }
     }
 }

 } // namespace android::surfaceflinger::frontend
	/*
	* Copyright 2022 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 ATRACE_TAG ATRACE_TAG_GRAPHICS

	#undef LOG_TAG
	#define LOG_TAG "LayerLifecycleManager"

	#include "LayerLifecycleManager.h"
	#include "Client.h" // temporarily needed for LayerCreationArgs
	#include "LayerLog.h"
	#include "SwapErase.h"

	namespace android::surfaceflinger::frontend {

	using namespace ftl::flag_operators;

	void LayerLifecycleManager::addLayers(std::vector<std::unique_ptr<RequestedLayerState>> newLayers) {
	if (newLayers.empty()) {
	return;
	}

	mGlobalChanges \|= RequestedLayerState::Changes::Hierarchy;
	for (auto& newLayer : newLayers) {
	RequestedLayerState& layer = *newLayer.get();
	auto [it, inserted] = mIdToLayer.try_emplace(layer.id, References{.owner = layer});
	if (!inserted) {
	LOG_ALWAYS_FATAL("Duplicate layer id found. New layer: %s Existing layer: %s",
	layer.getDebugString().c_str(),
	it->second.owner.getDebugString().c_str());
	}
	mAddedLayers.push_back(newLayer.get());
	layer.parentId = linkLayer(layer.parentId, layer.id);
	layer.relativeParentId = linkLayer(layer.relativeParentId, layer.id);
	if (layer.layerStackToMirror != ui::INVALID_LAYER_STACK) {
	// if this layer is mirroring a display, then walk though all the existing root layers
	// for the layer stack and add them as children to be mirrored.
	mDisplayMirroringLayers.emplace_back(layer.id);
	for (auto& rootLayer : mLayers) {
	if (rootLayer->isRoot() && rootLayer->layerStack == layer.layerStackToMirror) {
	layer.mirrorIds.emplace_back(rootLayer->id);
	linkLayer(rootLayer->id, layer.id);
	}
	}
	} else {
	// Check if we are mirroring a single layer, and if so add it to the list of children
	// to be mirrored.
	layer.layerIdToMirror = linkLayer(layer.layerIdToMirror, layer.id);
	if (layer.layerIdToMirror != UNASSIGNED_LAYER_ID) {
	layer.mirrorIds.emplace_back(layer.layerIdToMirror);
	}
	}
	layer.touchCropId = linkLayer(layer.touchCropId, layer.id);
	if (layer.isRoot()) {
	updateDisplayMirrorLayers(layer);
	}
	LLOGV(layer.id, "%s", layer.getDebugString().c_str());
	mLayers.emplace_back(std::move(newLayer));
	}
	}

	void LayerLifecycleManager::onHandlesDestroyed(const std::vector<uint32_t>& destroyedHandles,
	bool ignoreUnknownHandles) {
	std::vector<uint32_t> layersToBeDestroyed;
	for (const auto& layerId : destroyedHandles) {
	auto it = mIdToLayer.find(layerId);
	if (it == mIdToLayer.end()) {
	LOG_ALWAYS_FATAL_IF(!ignoreUnknownHandles, "%s Layerid not found %d", __func__,
	layerId);
	continue;
	}
	RequestedLayerState& layer = it->second.owner;
	LLOGV(layer.id, "%s", layer.getDebugString().c_str());
	layer.handleAlive = false;
	if (!layer.canBeDestroyed()) {
	continue;
	}
	layer.changes \|= RequestedLayerState::Changes::Destroyed;
	layersToBeDestroyed.emplace_back(layerId);
	}

	if (layersToBeDestroyed.empty()) {
	return;
	}

	mGlobalChanges \|= RequestedLayerState::Changes::Hierarchy;
	for (size_t i = 0; i < layersToBeDestroyed.size(); i++) {
	uint32_t layerId = layersToBeDestroyed[i];
	auto it = mIdToLayer.find(layerId);
	if (it == mIdToLayer.end()) {
	LOG_ALWAYS_FATAL("%s Layer with id %d not found", __func__, layerId);
	continue;
	}

	RequestedLayerState& layer = it->second.owner;

	layer.parentId = unlinkLayer(layer.parentId, layer.id);
	layer.relativeParentId = unlinkLayer(layer.relativeParentId, layer.id);
	if (layer.layerStackToMirror != ui::INVALID_LAYER_STACK) {
	layer.mirrorIds = unlinkLayers(layer.mirrorIds, layer.id);
	swapErase(mDisplayMirroringLayers, layer.id);
	} else {
	layer.layerIdToMirror = unlinkLayer(layer.layerIdToMirror, layer.id);
	layer.mirrorIds.clear();
	}

	layer.touchCropId = unlinkLayer(layer.touchCropId, layer.id);

	auto& references = it->second.references;
	for (uint32_t linkedLayerId : references) {
	RequestedLayerState* linkedLayer = getLayerFromId(linkedLayerId);
	if (!linkedLayer) {
	LOG_ALWAYS_FATAL("%s Layerid reference %d not found for %d", __func__,
	linkedLayerId, layer.id);
	continue;
	};
	if (linkedLayer->parentId == layer.id) {
	linkedLayer->parentId = UNASSIGNED_LAYER_ID;
	if (linkedLayer->canBeDestroyed()) {
	linkedLayer->changes \|= RequestedLayerState::Changes::Destroyed;
	layersToBeDestroyed.emplace_back(linkedLayer->id);
	}
	}
	if (linkedLayer->relativeParentId == layer.id) {
	linkedLayer->relativeParentId = UNASSIGNED_LAYER_ID;
	}
	if (swapErase(linkedLayer->mirrorIds, layer.id)) {
	linkedLayer->changes \|= RequestedLayerState::Changes::Mirror;
	}
	if (linkedLayer->touchCropId == layer.id) {
	linkedLayer->touchCropId = UNASSIGNED_LAYER_ID;
	}
	}
	mIdToLayer.erase(it);
	}

	auto it = mLayers.begin();
	while (it != mLayers.end()) {
	RequestedLayerState* layer = it->get();
	if (layer->changes.test(RequestedLayerState::Changes::Destroyed)) {
	LLOGV(layer->id, "destroyed %s", layer->getDebugStringShort().c_str());
	std::iter_swap(it, mLayers.end() - 1);
	mDestroyedLayers.emplace_back(std::move(mLayers.back()));
	if (it == mLayers.end() - 1) {
	it = mLayers.erase(mLayers.end() - 1);
	} else {
	mLayers.erase(mLayers.end() - 1);
	}
	} else {
	it++;
	}
	}
	}

	void LayerLifecycleManager::applyTransactions(const std::vector<TransactionState>& transactions,
	bool ignoreUnknownLayers) {
	for (const auto& transaction : transactions) {
	for (const auto& resolvedComposerState : transaction.states) {
	const auto& clientState = resolvedComposerState.state;
	uint32_t layerId = resolvedComposerState.layerId;
	if (layerId == UNASSIGNED_LAYER_ID) {
	ALOGW("%s Handle %p is not valid", __func__, clientState.surface.get());
	continue;
	}

	RequestedLayerState* layer = getLayerFromId(layerId);
	if (layer == nullptr) {
	LOG_ALWAYS_FATAL_IF(!ignoreUnknownLayers, "%s Layer with layerid=%d not found",
	__func__, layerId);
	continue;
	}

	if (!layer->handleAlive) {
	LOG_ALWAYS_FATAL("%s Layer's with layerid=%d) is not alive. Possible out of "
	"order LayerLifecycleManager updates",
	__func__, layerId);
	continue;
	}

	if (transaction.flags & ISurfaceComposer::eAnimation) {
	layer->changes \|= RequestedLayerState::Changes::Animation;
	}

	uint32_t oldParentId = layer->parentId;
	uint32_t oldRelativeParentId = layer->relativeParentId;
	uint32_t oldTouchCropId = layer->touchCropId;
	layer->merge(resolvedComposerState);

	if (layer->what & layer_state_t::eBackgroundColorChanged) {
	if (layer->bgColorLayerId == UNASSIGNED_LAYER_ID && layer->bgColor.a != 0) {
	LayerCreationArgs
	backgroundLayerArgs(LayerCreationArgs::getInternalLayerId(
	LayerCreationArgs::sInternalSequence++),
	/internalLayer=/true);
	backgroundLayerArgs.parentId = layer->id;
	backgroundLayerArgs.name = layer->name + "BackgroundColorLayer";
	backgroundLayerArgs.flags = ISurfaceComposerClient::eFXSurfaceEffect;
	std::vector<std::unique_ptr<RequestedLayerState>> newLayers;
	newLayers.emplace_back(
	std::make_unique<RequestedLayerState>(backgroundLayerArgs));
	RequestedLayerState* backgroundLayer = newLayers.back().get();
	backgroundLayer->bgColorLayer = true;
	backgroundLayer->handleAlive = false;
	backgroundLayer->parentId = layer->id;
	backgroundLayer->z = std::numeric_limits<int32_t>::min();
	backgroundLayer->color = layer->bgColor;
	backgroundLayer->dataspace = layer->bgColorDataspace;
	layer->bgColorLayerId = backgroundLayer->id;
	addLayers({std::move(newLayers)});
	} else if (layer->bgColorLayerId != UNASSIGNED_LAYER_ID && layer->bgColor.a == 0) {
	RequestedLayerState* bgColorLayer = getLayerFromId(layer->bgColorLayerId);
	layer->bgColorLayerId = UNASSIGNED_LAYER_ID;
	bgColorLayer->parentId = unlinkLayer(bgColorLayer->parentId, bgColorLayer->id);
	onHandlesDestroyed({bgColorLayer->id});
	} else if (layer->bgColorLayerId != UNASSIGNED_LAYER_ID) {
	RequestedLayerState* bgColorLayer = getLayerFromId(layer->bgColorLayerId);
	bgColorLayer->color = layer->bgColor;
	bgColorLayer->dataspace = layer->bgColorDataspace;
	bgColorLayer->what \|= layer_state_t::eColorChanged \|
	layer_state_t::eDataspaceChanged \| layer_state_t::eAlphaChanged;
	bgColorLayer->changes \|= RequestedLayerState::Changes::Content;
	mGlobalChanges \|= RequestedLayerState::Changes::Content;
	}
	}

	if (oldParentId != layer->parentId) {
	unlinkLayer(oldParentId, layer->id);
	layer->parentId = linkLayer(layer->parentId, layer->id);
	if (oldParentId == UNASSIGNED_LAYER_ID) {
	updateDisplayMirrorLayers(*layer);
	}
	}
	if (layer->what & layer_state_t::eLayerStackChanged && layer->isRoot()) {
	updateDisplayMirrorLayers(*layer);
	}
	if (oldRelativeParentId != layer->relativeParentId) {
	unlinkLayer(oldRelativeParentId, layer->id);
	layer->relativeParentId = linkLayer(layer->relativeParentId, layer->id);
	}
	if (oldTouchCropId != layer->touchCropId) {
	unlinkLayer(oldTouchCropId, layer->id);
	layer->touchCropId = linkLayer(layer->touchCropId, layer->id);
	}

	mGlobalChanges \|= layer->changes;
	}
	}
	}

	void LayerLifecycleManager::commitChanges() {
	for (auto layer : mAddedLayers) {
	for (auto& listener : mListeners) {
	listener->onLayerAdded(*layer);
	}
	}
	mAddedLayers.clear();

	for (auto& layer : mLayers) {
	layer->clearChanges();
	}

	for (auto& destroyedLayer : mDestroyedLayers) {
	for (auto& listener : mListeners) {
	listener->onLayerDestroyed(*destroyedLayer);
	}
	}
	mDestroyedLayers.clear();
	mGlobalChanges.clear();
	}

	void LayerLifecycleManager::addLifecycleListener(std::shared_ptr<ILifecycleListener> listener) {
	mListeners.emplace_back(std::move(listener));
	}

	void LayerLifecycleManager::removeLifecycleListener(std::shared_ptr<ILifecycleListener> listener) {
	swapErase(mListeners, listener);
	}

	const std::vector<std::unique_ptr<RequestedLayerState>>& LayerLifecycleManager::getLayers() const {
	return mLayers;
	}

	const std::vector<std::unique_ptr<RequestedLayerState>>& LayerLifecycleManager::getDestroyedLayers()
	const {
	return mDestroyedLayers;
	}

	const ftl::Flags<RequestedLayerState::Changes> LayerLifecycleManager::getGlobalChanges() const {
	return mGlobalChanges;
	}

	RequestedLayerState* LayerLifecycleManager::getLayerFromId(uint32_t id) {
	if (id == UNASSIGNED_LAYER_ID) {
	return nullptr;
	}
	auto it = mIdToLayer.find(id);
	if (it == mIdToLayer.end()) {
	return nullptr;
	}
	return &it->second.owner;
	}

	std::vector<uint32_t>* LayerLifecycleManager::getLinkedLayersFromId(uint32_t id) {
	if (id == UNASSIGNED_LAYER_ID) {
	return nullptr;
	}
	auto it = mIdToLayer.find(id);
	if (it == mIdToLayer.end()) {
	return nullptr;
	}
	return &it->second.references;
	}

	uint32_t LayerLifecycleManager::linkLayer(uint32_t layerId, uint32_t layerToLink) {
	if (layerId == UNASSIGNED_LAYER_ID) {
	return UNASSIGNED_LAYER_ID;
	}

	std::vector<uint32_t>* linkedLayers = getLinkedLayersFromId(layerId);
	if (!linkedLayers) {
	ALOGV("Could not find layer id %d to link %d. Parent is probably destroyed", layerId,
	layerToLink);
	return UNASSIGNED_LAYER_ID;
	}
	linkedLayers->emplace_back(layerToLink);
	return layerId;
	}

	uint32_t LayerLifecycleManager::unlinkLayer(uint32_t layerId, uint32_t linkedLayer) {
	std::vector<uint32_t>* linkedLayers = getLinkedLayersFromId(layerId);
	if (!linkedLayers) {
	return UNASSIGNED_LAYER_ID;
	}
	swapErase(*linkedLayers, linkedLayer);
	return UNASSIGNED_LAYER_ID;
	}

	std::vector<uint32_t> LayerLifecycleManager::unlinkLayers(const std::vector<uint32_t>& layerIds,
	uint32_t linkedLayer) {
	for (uint32_t layerId : layerIds) {
	unlinkLayer(layerId, linkedLayer);
	}
	return {};
	}

	std::string LayerLifecycleManager::References::getDebugString() const {
	std::string debugInfo = owner.name + "[" + std::to_string(owner.id) + "] refs:";
	std::for_each(references.begin(), references.end(),
	[&debugInfo = debugInfo](const uint32_t& reference) mutable {
	debugInfo += std::to_string(reference) + ",";
	});
	return debugInfo;
	}

	void LayerLifecycleManager::fixRelativeZLoop(uint32_t relativeRootId) {
	auto it = mIdToLayer.find(relativeRootId);
	if (it == mIdToLayer.end()) {
	return;
	}
	RequestedLayerState& layer = it->second.owner;
	layer.relativeParentId = unlinkLayer(layer.relativeParentId, layer.id);
	layer.changes \|=
	RequestedLayerState::Changes::Hierarchy \| RequestedLayerState::Changes::RelativeParent;
	mGlobalChanges \|= RequestedLayerState::Changes::Hierarchy;
	}

	// Some layers mirror the entire display stack. Since we don't have a single root layer per display
	// we have to track all these layers and update what they mirror when the list of root layers
	// on a display changes. This function walks through the list of display mirroring layers
	// and updates its list of layers that its mirroring. This function should be called when a new
	// root layer is added, removed or moved to another display.
	void LayerLifecycleManager::updateDisplayMirrorLayers(RequestedLayerState& rootLayer) {
	for (uint32_t mirrorLayerId : mDisplayMirroringLayers) {
	RequestedLayerState* mirrorLayer = getLayerFromId(mirrorLayerId);
	bool canBeMirrored =
	rootLayer.isRoot() && rootLayer.layerStack == mirrorLayer->layerStackToMirror;
	bool currentlyMirrored =
	std::find(mirrorLayer->mirrorIds.begin(), mirrorLayer->mirrorIds.end(),
	rootLayer.id) != mirrorLayer->mirrorIds.end();

	if (canBeMirrored && !currentlyMirrored) {
	mirrorLayer->mirrorIds.emplace_back(rootLayer.id);
	linkLayer(rootLayer.id, mirrorLayer->id);
	mirrorLayer->changes \|= RequestedLayerState::Changes::Mirror;
	} else if (!canBeMirrored && currentlyMirrored) {
	swapErase(mirrorLayer->mirrorIds, rootLayer.id);
	unlinkLayer(rootLayer.id, mirrorLayer->id);
	mirrorLayer->changes \|= RequestedLayerState::Changes::Mirror;
	}
	}
	}

	} // namespace android::surfaceflinger::frontend