services/surfaceflinger/CompositionEngine/src/planner/CachedSet.cpp - platform/frameworks/native - Gitiles

 /*
  * Copyright 2021 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.
  */

 #undef LOG_TAG
 #define LOG_TAG "Planner"
 // #define LOG_NDEBUG 0

 #include <android-base/properties.h>
 #include <compositionengine/impl/OutputCompositionState.h>
 #include <compositionengine/impl/planner/CachedSet.h>
 #include <math/HashCombine.h>
 #include <renderengine/DisplaySettings.h>
 #include <renderengine/RenderEngine.h>

 namespace android::compositionengine::impl::planner {

 const bool CachedSet::sDebugHighlighLayers =
         base::GetBoolProperty(std::string("debug.sf.layer_caching_highlight"), false);

 std::string durationString(std::chrono::milliseconds duration) {
     using namespace std::chrono_literals;

     std::string result;

     if (duration >= 1h) {
         const auto hours = std::chrono::duration_cast<std::chrono::hours>(duration);
         base::StringAppendF(&result, "%d hr ", static_cast<int>(hours.count()));
         duration -= hours;
     }
     if (duration >= 1min) {
         const auto minutes = std::chrono::duration_cast<std::chrono::minutes>(duration);
         base::StringAppendF(&result, "%d min ", static_cast<int>(minutes.count()));
         duration -= minutes;
     }
     base::StringAppendF(&result, "%.3f sec ", duration.count() / 1000.0f);

     return result;
 }

 CachedSet::Layer::Layer(const LayerState* state, std::chrono::steady_clock::time_point lastUpdate)
       : mState(state), mHash(state->getHash()), mLastUpdate(lastUpdate) {}

 CachedSet::CachedSet(const LayerState* layer, std::chrono::steady_clock::time_point lastUpdate)
       : mFingerprint(layer->getHash()), mLastUpdate(lastUpdate) {
     addLayer(layer, lastUpdate);
 }

 CachedSet::CachedSet(Layer layer)
       : mFingerprint(layer.getHash()),
         mLastUpdate(layer.getLastUpdate()),
         mBounds(layer.getDisplayFrame()),
         mVisibleRegion(layer.getVisibleRegion()) {
     mLayers.emplace_back(std::move(layer));
 }

 void CachedSet::addLayer(const LayerState* layer,
                          std::chrono::steady_clock::time_point lastUpdate) {
     mLayers.emplace_back(layer, lastUpdate);

     Region boundingRegion;
     boundingRegion.orSelf(mBounds);
     boundingRegion.orSelf(layer->getDisplayFrame());
     mBounds = boundingRegion.getBounds();
     mVisibleRegion.orSelf(layer->getVisibleRegion());
 }

 NonBufferHash CachedSet::getNonBufferHash() const {
     if (mLayers.size() == 1) {
         return mFingerprint;
     }

     // TODO(b/182614524): We sometimes match this with LayerState hashes. Determine if that is
     // necessary (and therefore we need to match implementations).
     size_t hash = 0;
     android::hashCombineSingle(hash, mBounds);
     android::hashCombineSingle(hash, mOutputDataspace);
     android::hashCombineSingle(hash, mOrientation);
     return hash;
 }

 size_t CachedSet::getComponentDisplayCost() const {
     size_t displayCost = 0;

     for (const Layer& layer : mLayers) {
         displayCost += static_cast<size_t>(layer.getDisplayFrame().width() *
                                            layer.getDisplayFrame().height());
     }

     return displayCost;
 }

 size_t CachedSet::getCreationCost() const {
     if (mLayers.size() == 1) {
         return 0;
     }

     // Reads
     size_t creationCost = getComponentDisplayCost();

     // Write - assumes that the output buffer only gets written once per pixel
     creationCost += static_cast<size_t>(mBounds.width() * mBounds.height());

     return creationCost;
 }

 size_t CachedSet::getDisplayCost() const {
     return static_cast<size_t>(mBounds.width() * mBounds.height());
 }

 bool CachedSet::hasBufferUpdate() const {
     for (const Layer& layer : mLayers) {
         if (layer.getFramesSinceBufferUpdate() == 0) {
             return true;
         }
     }
     return false;
 }

 bool CachedSet::hasReadyBuffer() const {
     return mTexture != nullptr && mDrawFence->getStatus() == Fence::Status::Signaled;
 }

 std::vector<CachedSet> CachedSet::decompose() const {
     std::vector<CachedSet> layers;

     std::transform(mLayers.begin(), mLayers.end(), std::back_inserter(layers),
                    [](Layer layer) { return CachedSet(std::move(layer)); });

     return layers;
 }

 void CachedSet::updateAge(std::chrono::steady_clock::time_point now) {
     LOG_ALWAYS_FATAL_IF(mLayers.size() > 1, "[%s] This should only be called on single-layer sets",
                         __func__);

     if (mLayers[0].getFramesSinceBufferUpdate() == 0) {
         mLastUpdate = now;
         mAge = 0;
     }
 }

 void CachedSet::render(renderengine::RenderEngine& renderEngine,
                        const OutputCompositionState& outputState) {
     const Rect& viewport = outputState.layerStackSpace.content;
     const ui::Dataspace& outputDataspace = outputState.dataspace;
     const ui::Transform::RotationFlags orientation =
             ui::Transform::toRotationFlags(outputState.framebufferSpace.orientation);

     renderengine::DisplaySettings displaySettings{
             .physicalDisplay = Rect(-mBounds.left + outputState.framebufferSpace.content.left,
                                     -mBounds.top + outputState.framebufferSpace.content.top,
                                     -mBounds.left + outputState.framebufferSpace.content.right,
                                     -mBounds.top + outputState.framebufferSpace.content.bottom),
             .clip = viewport,
             .outputDataspace = outputDataspace,
             .orientation = orientation,
     };

     Region clearRegion = Region::INVALID_REGION;
     LayerFE::ClientCompositionTargetSettings targetSettings{
             .clip = Region(viewport),
             .needsFiltering = false,
             .isSecure = true,
             .supportsProtectedContent = false,
             .clearRegion = clearRegion,
             .viewport = viewport,
             .dataspace = outputDataspace,
             .realContentIsVisible = true,
             .clearContent = false,
             .disableBlurs = false,
     };

     std::vector<renderengine::LayerSettings> layerSettings;
     renderengine::LayerSettings highlight;
     for (const auto& layer : mLayers) {
         const auto clientCompositionList =
                 layer.getState()->getOutputLayer()->getLayerFE().prepareClientCompositionList(
                         targetSettings);
         layerSettings.insert(layerSettings.end(), clientCompositionList.cbegin(),
                              clientCompositionList.cend());
     }

     std::vector<const renderengine::LayerSettings*> layerSettingsPointers;
     std::transform(layerSettings.cbegin(), layerSettings.cend(),
                    std::back_inserter(layerSettingsPointers),
                    [](const renderengine::LayerSettings& settings) { return &settings; });
     renderengine::LayerSettings holePunchSettings;
     if (mHolePunchLayer) {
         auto clientCompositionList =
                 mHolePunchLayer->getOutputLayer()->getLayerFE().prepareClientCompositionList(
                         targetSettings);
         // Assume that the final layer contains the buffer that we want to
         // replace with a hole punch.
         holePunchSettings = clientCompositionList.back();
         LOG_ALWAYS_FATAL_IF(!holePunchSettings.source.buffer.buffer, "Expected to have a buffer!");
         // This mimics Layer::prepareClearClientComposition
         holePunchSettings.source.buffer.buffer = nullptr;
         holePunchSettings.source.solidColor = half3(0.0f, 0.0f, 0.0f);
         holePunchSettings.disableBlending = true;
         holePunchSettings.alpha = 0.0f;
         holePunchSettings.name = std::string("hole punch layer");
         layerSettingsPointers.push_back(&holePunchSettings);
     }

     if (sDebugHighlighLayers) {
         highlight = {
                 .geometry =
                         renderengine::Geometry{
                                 .boundaries = FloatRect(0.0f, 0.0f,
                                                         static_cast<float>(mBounds.getWidth()),
                                                         static_cast<float>(mBounds.getHeight())),
                         },
                 .source =
                         renderengine::PixelSource{
                                 .solidColor = half3(0.25f, 0.0f, 0.5f),
                         },
                 .alpha = half(0.05f),
         };

         layerSettingsPointers.emplace_back(&highlight);
     }

     const uint64_t usageFlags = GraphicBuffer::USAGE_HW_RENDER | GraphicBuffer::USAGE_HW_COMPOSER |
             GraphicBuffer::USAGE_HW_TEXTURE;
     sp<GraphicBuffer> buffer = new GraphicBuffer(static_cast<uint32_t>(mBounds.getWidth()),
                                                  static_cast<uint32_t>(mBounds.getHeight()),
                                                  HAL_PIXEL_FORMAT_RGBA_8888, 1, usageFlags);
     const auto texture = std::make_shared<
             renderengine::ExternalTexture>(buffer, renderEngine,
                                            renderengine::ExternalTexture::Usage::READABLE |
                                                    renderengine::ExternalTexture::Usage::WRITEABLE);
     LOG_ALWAYS_FATAL_IF(buffer->initCheck() != OK);
     base::unique_fd drawFence;

     status_t result = renderEngine.drawLayers(displaySettings, layerSettingsPointers, texture,
                                               false, base::unique_fd(), &drawFence);

     if (result == NO_ERROR) {
         mDrawFence = new Fence(drawFence.release());
         mOutputSpace = outputState.framebufferSpace;
         mTexture = std::move(texture);
         mOutputSpace.orientation = outputState.framebufferSpace.orientation;
         mOutputDataspace = outputDataspace;
         mOrientation = orientation;
     } else {
         mTexture = nullptr;
     }
 }

 bool CachedSet::requiresHolePunch() const {
     // In order for the hole punch to be beneficial, the layer must be updating
     // regularly, meaning  it should not have been merged with other layers.
     if (getLayerCount() != 1) {
         return false;
     }

     // There is no benefit to a hole punch unless the layer has a buffer.
     if (!mLayers[0].getBuffer()) {
         return false;
     }

     const auto& layerFE = mLayers[0].getState()->getOutputLayer()->getLayerFE();
     if (layerFE.getCompositionState()->forceClientComposition) {
         return false;
     }

     return layerFE.hasRoundedCorners();
 }

 namespace {
 bool contains(const Rect& outer, const Rect& inner) {
     return outer.left <= inner.left && outer.right >= inner.right && outer.top <= inner.top &&
             outer.bottom >= inner.bottom;
 }
 }; // namespace

 void CachedSet::addHolePunchLayerIfFeasible(const CachedSet& holePunchLayer, bool isFirstLayer) {
     // Verify that this CachedSet is opaque where the hole punch layer
     // will draw.
     const Rect& holePunchBounds = holePunchLayer.getBounds();
     for (const auto& layer : mLayers) {
         // The first layer is considered opaque because nothing is behind it.
         // Note that isOpaque is always false for a layer with rounded
         // corners, even if the interior is opaque. In theory, such a layer
         // could be used for a hole punch, but this is unlikely to happen in
         // practice.
         const auto* outputLayer = layer.getState()->getOutputLayer();
         if (contains(outputLayer->getState().displayFrame, holePunchBounds) &&
             (isFirstLayer || outputLayer->getLayerFE().getCompositionState()->isOpaque)) {
             mHolePunchLayer = holePunchLayer.getFirstLayer().getState();
             return;
         }
     }
 }

 OutputLayer* CachedSet::getHolePunchLayer() const {
     return mHolePunchLayer ? mHolePunchLayer->getOutputLayer() : nullptr;
 }

 void CachedSet::dump(std::string& result) const {
     const auto now = std::chrono::steady_clock::now();

     const auto lastUpdate =
             std::chrono::duration_cast<std::chrono::milliseconds>(now - mLastUpdate);
     base::StringAppendF(&result, "  + Fingerprint %016zx, last update %sago, age %zd\n",
                         mFingerprint, durationString(lastUpdate).c_str(), mAge);
     {
         const auto b = mTexture ? mTexture->getBuffer().get() : nullptr;
         base::StringAppendF(&result, "    Override buffer: %p\n", b);
     }
     base::StringAppendF(&result, "    HolePunchLayer: %p\n", mHolePunchLayer);

     if (mLayers.size() == 1) {
         base::StringAppendF(&result, "    Layer [%s]\n", mLayers[0].getName().c_str());
         base::StringAppendF(&result, "    Buffer %p", mLayers[0].getBuffer().get());
     } else {
         result.append("    Cached set of:");
         for (const Layer& layer : mLayers) {
             base::StringAppendF(&result, "\n      Layer [%s]", layer.getName().c_str());
         }
     }

     base::StringAppendF(&result, "\n    Creation cost: %zd", getCreationCost());
     base::StringAppendF(&result, "\n    Display cost: %zd\n", getDisplayCost());
 }

 } // namespace android::compositionengine::impl::planner
	/*
	* Copyright 2021 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.
	*/

	#undef LOG_TAG
	#define LOG_TAG "Planner"
	// #define LOG_NDEBUG 0

	#include <android-base/properties.h>
	#include <compositionengine/impl/OutputCompositionState.h>
	#include <compositionengine/impl/planner/CachedSet.h>
	#include <math/HashCombine.h>
	#include <renderengine/DisplaySettings.h>
	#include <renderengine/RenderEngine.h>

	namespace android::compositionengine::impl::planner {

	const bool CachedSet::sDebugHighlighLayers =
	base::GetBoolProperty(std::string("debug.sf.layer_caching_highlight"), false);

	std::string durationString(std::chrono::milliseconds duration) {
	using namespace std::chrono_literals;

	std::string result;

	if (duration >= 1h) {
	const auto hours = std::chrono::duration_cast<std::chrono::hours>(duration);
	base::StringAppendF(&result, "%d hr ", static_cast<int>(hours.count()));
	duration -= hours;
	}
	if (duration >= 1min) {
	const auto minutes = std::chrono::duration_cast<std::chrono::minutes>(duration);
	base::StringAppendF(&result, "%d min ", static_cast<int>(minutes.count()));
	duration -= minutes;
	}
	base::StringAppendF(&result, "%.3f sec ", duration.count() / 1000.0f);

	return result;
	}

	CachedSet::Layer::Layer(const LayerState* state, std::chrono::steady_clock::time_point lastUpdate)
	: mState(state), mHash(state->getHash()), mLastUpdate(lastUpdate) {}

	CachedSet::CachedSet(const LayerState* layer, std::chrono::steady_clock::time_point lastUpdate)
	: mFingerprint(layer->getHash()), mLastUpdate(lastUpdate) {
	addLayer(layer, lastUpdate);
	}

	CachedSet::CachedSet(Layer layer)
	: mFingerprint(layer.getHash()),
	mLastUpdate(layer.getLastUpdate()),
	mBounds(layer.getDisplayFrame()),
	mVisibleRegion(layer.getVisibleRegion()) {
	mLayers.emplace_back(std::move(layer));
	}

	void CachedSet::addLayer(const LayerState* layer,
	std::chrono::steady_clock::time_point lastUpdate) {
	mLayers.emplace_back(layer, lastUpdate);

	Region boundingRegion;
	boundingRegion.orSelf(mBounds);
	boundingRegion.orSelf(layer->getDisplayFrame());
	mBounds = boundingRegion.getBounds();
	mVisibleRegion.orSelf(layer->getVisibleRegion());
	}

	NonBufferHash CachedSet::getNonBufferHash() const {
	if (mLayers.size() == 1) {
	return mFingerprint;
	}

	// TODO(b/182614524): We sometimes match this with LayerState hashes. Determine if that is
	// necessary (and therefore we need to match implementations).
	size_t hash = 0;
	android::hashCombineSingle(hash, mBounds);
	android::hashCombineSingle(hash, mOutputDataspace);
	android::hashCombineSingle(hash, mOrientation);
	return hash;
	}

	size_t CachedSet::getComponentDisplayCost() const {
	size_t displayCost = 0;

	for (const Layer& layer : mLayers) {
	displayCost += static_cast<size_t>(layer.getDisplayFrame().width() *
	layer.getDisplayFrame().height());
	}

	return displayCost;
	}

	size_t CachedSet::getCreationCost() const {
	if (mLayers.size() == 1) {
	return 0;
	}

	// Reads
	size_t creationCost = getComponentDisplayCost();

	// Write - assumes that the output buffer only gets written once per pixel
	creationCost += static_cast<size_t>(mBounds.width() * mBounds.height());

	return creationCost;
	}

	size_t CachedSet::getDisplayCost() const {
	return static_cast<size_t>(mBounds.width() * mBounds.height());
	}

	bool CachedSet::hasBufferUpdate() const {
	for (const Layer& layer : mLayers) {
	if (layer.getFramesSinceBufferUpdate() == 0) {
	return true;
	}
	}
	return false;
	}

	bool CachedSet::hasReadyBuffer() const {
	return mTexture != nullptr && mDrawFence->getStatus() == Fence::Status::Signaled;
	}

	std::vector<CachedSet> CachedSet::decompose() const {
	std::vector<CachedSet> layers;

	std::transform(mLayers.begin(), mLayers.end(), std::back_inserter(layers),
	[](Layer layer) { return CachedSet(std::move(layer)); });

	return layers;
	}

	void CachedSet::updateAge(std::chrono::steady_clock::time_point now) {
	LOG_ALWAYS_FATAL_IF(mLayers.size() > 1, "[%s] This should only be called on single-layer sets",
	__func__);

	if (mLayers[0].getFramesSinceBufferUpdate() == 0) {
	mLastUpdate = now;
	mAge = 0;
	}
	}

	void CachedSet::render(renderengine::RenderEngine& renderEngine,
	const OutputCompositionState& outputState) {
	const Rect& viewport = outputState.layerStackSpace.content;
	const ui::Dataspace& outputDataspace = outputState.dataspace;
	const ui::Transform::RotationFlags orientation =
	ui::Transform::toRotationFlags(outputState.framebufferSpace.orientation);

	renderengine::DisplaySettings displaySettings{
	.physicalDisplay = Rect(-mBounds.left + outputState.framebufferSpace.content.left,
	-mBounds.top + outputState.framebufferSpace.content.top,
	-mBounds.left + outputState.framebufferSpace.content.right,
	-mBounds.top + outputState.framebufferSpace.content.bottom),
	.clip = viewport,
	.outputDataspace = outputDataspace,
	.orientation = orientation,
	};

	Region clearRegion = Region::INVALID_REGION;
	LayerFE::ClientCompositionTargetSettings targetSettings{
	.clip = Region(viewport),
	.needsFiltering = false,
	.isSecure = true,
	.supportsProtectedContent = false,
	.clearRegion = clearRegion,
	.viewport = viewport,
	.dataspace = outputDataspace,
	.realContentIsVisible = true,
	.clearContent = false,
	.disableBlurs = false,
	};

	std::vector<renderengine::LayerSettings> layerSettings;
	renderengine::LayerSettings highlight;
	for (const auto& layer : mLayers) {
	const auto clientCompositionList =
	layer.getState()->getOutputLayer()->getLayerFE().prepareClientCompositionList(
	targetSettings);
	layerSettings.insert(layerSettings.end(), clientCompositionList.cbegin(),
	clientCompositionList.cend());
	}

	std::vector<const renderengine::LayerSettings*> layerSettingsPointers;
	std::transform(layerSettings.cbegin(), layerSettings.cend(),
	std::back_inserter(layerSettingsPointers),
	[](const renderengine::LayerSettings& settings) { return &settings; });
	renderengine::LayerSettings holePunchSettings;
	if (mHolePunchLayer) {
	auto clientCompositionList =
	mHolePunchLayer->getOutputLayer()->getLayerFE().prepareClientCompositionList(
	targetSettings);
	// Assume that the final layer contains the buffer that we want to
	// replace with a hole punch.
	holePunchSettings = clientCompositionList.back();
	LOG_ALWAYS_FATAL_IF(!holePunchSettings.source.buffer.buffer, "Expected to have a buffer!");
	// This mimics Layer::prepareClearClientComposition
	holePunchSettings.source.buffer.buffer = nullptr;
	holePunchSettings.source.solidColor = half3(0.0f, 0.0f, 0.0f);
	holePunchSettings.disableBlending = true;
	holePunchSettings.alpha = 0.0f;
	holePunchSettings.name = std::string("hole punch layer");
	layerSettingsPointers.push_back(&holePunchSettings);
	}

	if (sDebugHighlighLayers) {
	highlight = {
	.geometry =
	renderengine::Geometry{
	.boundaries = FloatRect(0.0f, 0.0f,
	static_cast<float>(mBounds.getWidth()),
	static_cast<float>(mBounds.getHeight())),
	},
	.source =
	renderengine::PixelSource{
	.solidColor = half3(0.25f, 0.0f, 0.5f),
	},
	.alpha = half(0.05f),
	};

	layerSettingsPointers.emplace_back(&highlight);
	}

	const uint64_t usageFlags = GraphicBuffer::USAGE_HW_RENDER \| GraphicBuffer::USAGE_HW_COMPOSER \|
	GraphicBuffer::USAGE_HW_TEXTURE;
	sp<GraphicBuffer> buffer = new GraphicBuffer(static_cast<uint32_t>(mBounds.getWidth()),
	static_cast<uint32_t>(mBounds.getHeight()),
	HAL_PIXEL_FORMAT_RGBA_8888, 1, usageFlags);
	const auto texture = std::make_shared<
	renderengine::ExternalTexture>(buffer, renderEngine,
	renderengine::ExternalTexture::Usage::READABLE \|
	renderengine::ExternalTexture::Usage::WRITEABLE);
	LOG_ALWAYS_FATAL_IF(buffer->initCheck() != OK);
	base::unique_fd drawFence;

	status_t result = renderEngine.drawLayers(displaySettings, layerSettingsPointers, texture,
	false, base::unique_fd(), &drawFence);

	if (result == NO_ERROR) {
	mDrawFence = new Fence(drawFence.release());
	mOutputSpace = outputState.framebufferSpace;
	mTexture = std::move(texture);
	mOutputSpace.orientation = outputState.framebufferSpace.orientation;
	mOutputDataspace = outputDataspace;
	mOrientation = orientation;
	} else {
	mTexture = nullptr;
	}
	}

	bool CachedSet::requiresHolePunch() const {
	// In order for the hole punch to be beneficial, the layer must be updating
	// regularly, meaning it should not have been merged with other layers.
	if (getLayerCount() != 1) {
	return false;
	}

	// There is no benefit to a hole punch unless the layer has a buffer.
	if (!mLayers[0].getBuffer()) {
	return false;
	}

	const auto& layerFE = mLayers[0].getState()->getOutputLayer()->getLayerFE();
	if (layerFE.getCompositionState()->forceClientComposition) {
	return false;
	}

	return layerFE.hasRoundedCorners();
	}

	namespace {
	bool contains(const Rect& outer, const Rect& inner) {
	return outer.left <= inner.left && outer.right >= inner.right && outer.top <= inner.top &&
	outer.bottom >= inner.bottom;
	}
	}; // namespace

	void CachedSet::addHolePunchLayerIfFeasible(const CachedSet& holePunchLayer, bool isFirstLayer) {
	// Verify that this CachedSet is opaque where the hole punch layer
	// will draw.
	const Rect& holePunchBounds = holePunchLayer.getBounds();
	for (const auto& layer : mLayers) {
	// The first layer is considered opaque because nothing is behind it.
	// Note that isOpaque is always false for a layer with rounded
	// corners, even if the interior is opaque. In theory, such a layer
	// could be used for a hole punch, but this is unlikely to happen in
	// practice.
	const auto* outputLayer = layer.getState()->getOutputLayer();
	if (contains(outputLayer->getState().displayFrame, holePunchBounds) &&
	(isFirstLayer \|\| outputLayer->getLayerFE().getCompositionState()->isOpaque)) {
	mHolePunchLayer = holePunchLayer.getFirstLayer().getState();
	return;
	}
	}
	}

	OutputLayer* CachedSet::getHolePunchLayer() const {
	return mHolePunchLayer ? mHolePunchLayer->getOutputLayer() : nullptr;
	}

	void CachedSet::dump(std::string& result) const {
	const auto now = std::chrono::steady_clock::now();

	const auto lastUpdate =
	std::chrono::duration_cast<std::chrono::milliseconds>(now - mLastUpdate);
	base::StringAppendF(&result, " + Fingerprint %016zx, last update %sago, age %zd\n",
	mFingerprint, durationString(lastUpdate).c_str(), mAge);
	{
	const auto b = mTexture ? mTexture->getBuffer().get() : nullptr;
	base::StringAppendF(&result, " Override buffer: %p\n", b);
	}
	base::StringAppendF(&result, " HolePunchLayer: %p\n", mHolePunchLayer);

	if (mLayers.size() == 1) {
	base::StringAppendF(&result, " Layer [%s]\n", mLayers[0].getName().c_str());
	base::StringAppendF(&result, " Buffer %p", mLayers[0].getBuffer().get());
	} else {
	result.append(" Cached set of:");
	for (const Layer& layer : mLayers) {
	base::StringAppendF(&result, "\n Layer [%s]", layer.getName().c_str());
	}
	}

	base::StringAppendF(&result, "\n Creation cost: %zd", getCreationCost());
	base::StringAppendF(&result, "\n Display cost: %zd\n", getDisplayCost());
	}

	} // namespace android::compositionengine::impl::planner