services/surfaceflinger/tests/LayerTransactionTest.h - android_frameworks_native - Gitiles

 /*
  * Copyright (C) 2019 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.
  */

 #pragma once

 #include <gtest/gtest.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/SurfaceComposerClient.h>
 #include <private/gui/ComposerService.h>
 #include <ui/DisplayConfig.h>

 #include "BufferGenerator.h"
 #include "utils/ScreenshotUtils.h"
 #include "utils/TransactionUtils.h"

 namespace android {

 using android::hardware::graphics::common::V1_1::BufferUsage;

 class LayerTransactionTest : public ::testing::Test {
 protected:
     void SetUp() override {
         mClient = new SurfaceComposerClient;
         ASSERT_EQ(NO_ERROR, mClient->initCheck()) << "failed to create SurfaceComposerClient";

         ASSERT_NO_FATAL_FAILURE(SetUpDisplay());

         sp<ISurfaceComposer> sf(ComposerService::getComposerService());
         ASSERT_NO_FATAL_FAILURE(sf->getColorManagement(&mColorManagementUsed));
     }

     virtual void TearDown() {
         mBlackBgSurface = 0;
         mClient->dispose();
         mClient = 0;
     }

     virtual sp<SurfaceControl> createLayer(const sp<SurfaceComposerClient>& client,
                                            const char* name, uint32_t width, uint32_t height,
                                            uint32_t flags = 0, SurfaceControl* parent = nullptr,
                                            uint32_t* outTransformHint = nullptr,
                                            PixelFormat format = PIXEL_FORMAT_RGBA_8888) {
         auto layer =
                 createSurface(client, name, width, height, format, flags, parent, outTransformHint);

         Transaction t;
         t.setLayerStack(layer, mDisplayLayerStack).setLayer(layer, mLayerZBase);

         status_t error = t.apply();
         if (error != NO_ERROR) {
             ADD_FAILURE() << "failed to initialize SurfaceControl";
             layer.clear();
         }

         return layer;
     }

     virtual sp<SurfaceControl> createSurface(const sp<SurfaceComposerClient>& client,
                                              const char* name, uint32_t width, uint32_t height,
                                              PixelFormat format, uint32_t flags,
                                              SurfaceControl* parent = nullptr,
                                              uint32_t* outTransformHint = nullptr) {
         auto layer = client->createSurface(String8(name), width, height, format, flags, parent,
                                            LayerMetadata(), outTransformHint);
         EXPECT_NE(nullptr, layer.get()) << "failed to create SurfaceControl";
         return layer;
     }

     virtual sp<SurfaceControl> createLayer(const char* name, uint32_t width, uint32_t height,
                                            uint32_t flags = 0, SurfaceControl* parent = nullptr,
                                            uint32_t* outTransformHint = nullptr,
                                            PixelFormat format = PIXEL_FORMAT_RGBA_8888) {
         return createLayer(mClient, name, width, height, flags, parent, outTransformHint, format);
     }

     sp<SurfaceControl> createColorLayer(const char* name, const Color& color,
                                         SurfaceControl* parent = nullptr) {
         auto colorLayer = createSurface(mClient, name, 0 /* buffer width */, 0 /* buffer height */,
                                         PIXEL_FORMAT_RGBA_8888,
                                         ISurfaceComposerClient::eFXSurfaceEffect, parent);
         asTransaction([&](Transaction& t) {
             t.setColor(colorLayer, half3{color.r / 255.0f, color.g / 255.0f, color.b / 255.0f});
             t.setAlpha(colorLayer, color.a / 255.0f);
         });
         return colorLayer;
     }

     ANativeWindow_Buffer getBufferQueueLayerBuffer(const sp<SurfaceControl>& layer) {
         // wait for previous transactions (such as setSize) to complete
         Transaction().apply(true);

         ANativeWindow_Buffer buffer = {};
         EXPECT_EQ(NO_ERROR, layer->getSurface()->lock(&buffer, nullptr));

         return buffer;
     }

     void postBufferQueueLayerBuffer(const sp<SurfaceControl>& layer) {
         ASSERT_EQ(NO_ERROR, layer->getSurface()->unlockAndPost());

         // wait for the newly posted buffer to be latched
         waitForLayerBuffers();
     }

     virtual void fillBufferQueueLayerColor(const sp<SurfaceControl>& layer, const Color& color,
                                            int32_t bufferWidth, int32_t bufferHeight) {
         ANativeWindow_Buffer buffer;
         ASSERT_NO_FATAL_FAILURE(buffer = getBufferQueueLayerBuffer(layer));
         TransactionUtils::fillANativeWindowBufferColor(buffer,
                                                        Rect(0, 0, bufferWidth, bufferHeight),
                                                        color);
         postBufferQueueLayerBuffer(layer);
     }

     virtual void fillBufferStateLayerColor(const sp<SurfaceControl>& layer, const Color& color,
                                            int32_t bufferWidth, int32_t bufferHeight) {
         sp<GraphicBuffer> buffer =
                 new GraphicBuffer(bufferWidth, bufferHeight, PIXEL_FORMAT_RGBA_8888, 1,
                                   BufferUsage::CPU_READ_OFTEN | BufferUsage::CPU_WRITE_OFTEN |
                                           BufferUsage::COMPOSER_OVERLAY,
                                   "test");
         TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, 0, bufferWidth, bufferHeight),
                                                  color);
         Transaction().setBuffer(layer, buffer).apply();
     }

     void fillLayerColor(uint32_t mLayerType, const sp<SurfaceControl>& layer, const Color& color,
                         int32_t bufferWidth, int32_t bufferHeight) {
         switch (mLayerType) {
             case ISurfaceComposerClient::eFXSurfaceBufferQueue:
                 fillBufferQueueLayerColor(layer, color, bufferWidth, bufferHeight);
                 break;
             case ISurfaceComposerClient::eFXSurfaceBufferState:
                 fillBufferStateLayerColor(layer, color, bufferWidth, bufferHeight);
                 break;
             default:
                 ASSERT_TRUE(false) << "unsupported layer type: " << mLayerType;
         }
     }

     void fillLayerQuadrant(uint32_t mLayerType, const sp<SurfaceControl>& layer,
                            int32_t bufferWidth, int32_t bufferHeight, const Color& topLeft,
                            const Color& topRight, const Color& bottomLeft,
                            const Color& bottomRight) {
         switch (mLayerType) {
             case ISurfaceComposerClient::eFXSurfaceBufferQueue:
                 fillBufferQueueLayerQuadrant(layer, bufferWidth, bufferHeight, topLeft, topRight,
                                              bottomLeft, bottomRight);
                 break;
             case ISurfaceComposerClient::eFXSurfaceBufferState:
                 fillBufferStateLayerQuadrant(layer, bufferWidth, bufferHeight, topLeft, topRight,
                                              bottomLeft, bottomRight);
                 break;
             default:
                 ASSERT_TRUE(false) << "unsupported layer type: " << mLayerType;
         }
     }

     virtual void fillBufferQueueLayerQuadrant(const sp<SurfaceControl>& layer, int32_t bufferWidth,
                                               int32_t bufferHeight, const Color& topLeft,
                                               const Color& topRight, const Color& bottomLeft,
                                               const Color& bottomRight) {
         ANativeWindow_Buffer buffer;
         ASSERT_NO_FATAL_FAILURE(buffer = getBufferQueueLayerBuffer(layer));
         ASSERT_TRUE(bufferWidth % 2 == 0 && bufferHeight % 2 == 0);

         const int32_t halfW = bufferWidth / 2;
         const int32_t halfH = bufferHeight / 2;
         TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(0, 0, halfW, halfH), topLeft);
         TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(halfW, 0, bufferWidth, halfH),
                                                        topRight);
         TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(0, halfH, halfW, bufferHeight),
                                                        bottomLeft);
         TransactionUtils::fillANativeWindowBufferColor(buffer,
                                                        Rect(halfW, halfH, bufferWidth,
                                                             bufferHeight),
                                                        bottomRight);

         postBufferQueueLayerBuffer(layer);
     }

     virtual void fillBufferStateLayerQuadrant(const sp<SurfaceControl>& layer, int32_t bufferWidth,
                                               int32_t bufferHeight, const Color& topLeft,
                                               const Color& topRight, const Color& bottomLeft,
                                               const Color& bottomRight) {
         sp<GraphicBuffer> buffer =
                 new GraphicBuffer(bufferWidth, bufferHeight, PIXEL_FORMAT_RGBA_8888, 1,
                                   BufferUsage::CPU_READ_OFTEN | BufferUsage::CPU_WRITE_OFTEN |
                                           BufferUsage::COMPOSER_OVERLAY,
                                   "test");

         ASSERT_TRUE(bufferWidth % 2 == 0 && bufferHeight % 2 == 0);

         const int32_t halfW = bufferWidth / 2;
         const int32_t halfH = bufferHeight / 2;
         TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, 0, halfW, halfH), topLeft);
         TransactionUtils::fillGraphicBufferColor(buffer, Rect(halfW, 0, bufferWidth, halfH),
                                                  topRight);
         TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, halfH, halfW, bufferHeight),
                                                  bottomLeft);
         TransactionUtils::fillGraphicBufferColor(buffer,
                                                  Rect(halfW, halfH, bufferWidth, bufferHeight),
                                                  bottomRight);

         Transaction().setBuffer(layer, buffer).setSize(layer, bufferWidth, bufferHeight).apply();
     }

     std::unique_ptr<ScreenCapture> screenshot() {
         std::unique_ptr<ScreenCapture> screenshot;
         ScreenCapture::captureScreen(&screenshot);
         return screenshot;
     }

     void asTransaction(const std::function<void(Transaction&)>& exec) {
         Transaction t;
         exec(t);
         t.apply(true);
     }

     static status_t getBuffer(sp<GraphicBuffer>* outBuffer, sp<Fence>* outFence) {
         static BufferGenerator bufferGenerator;
         return bufferGenerator.get(outBuffer, outFence);
     }

     sp<SurfaceComposerClient> mClient;

     sp<IBinder> mDisplay;
     uint32_t mDisplayWidth;
     uint32_t mDisplayHeight;
     uint32_t mDisplayLayerStack;
     Rect mDisplayRect = Rect::INVALID_RECT;

     // leave room for ~256 layers
     const int32_t mLayerZBase = std::numeric_limits<int32_t>::max() - 256;

     sp<SurfaceControl> mBlackBgSurface;
     bool mColorManagementUsed;

 private:
     void SetUpDisplay() {
         mDisplay = mClient->getInternalDisplayToken();
         ASSERT_FALSE(mDisplay == nullptr) << "failed to get display";

         DisplayConfig config;
         ASSERT_EQ(NO_ERROR, SurfaceComposerClient::getActiveDisplayConfig(mDisplay, &config));
         mDisplayRect = Rect(config.resolution);
         mDisplayWidth = mDisplayRect.getWidth();
         mDisplayHeight = mDisplayRect.getHeight();

         // After a new buffer is queued, SurfaceFlinger is notified and will
         // latch the new buffer on next vsync.  Let's heuristically wait for 3
         // vsyncs.
         mBufferPostDelay = static_cast<int32_t>(1e6 / config.refreshRate) * 3;

         mDisplayLayerStack = 0;

         mBlackBgSurface =
                 createSurface(mClient, "BaseSurface", 0 /* buffer width */, 0 /* buffer height */,
                               PIXEL_FORMAT_RGBA_8888, ISurfaceComposerClient::eFXSurfaceEffect);

         // set layer stack (b/68888219)
         Transaction t;
         t.setDisplayLayerStack(mDisplay, mDisplayLayerStack);
         t.setCrop_legacy(mBlackBgSurface, Rect(0, 0, mDisplayWidth, mDisplayHeight));
         t.setLayerStack(mBlackBgSurface, mDisplayLayerStack);
         t.setColor(mBlackBgSurface, half3{0, 0, 0});
         t.setLayer(mBlackBgSurface, mLayerZBase);
         t.apply();
     }

     void waitForLayerBuffers() {
         // Request an empty transaction to get applied synchronously to ensure the buffer is
         // latched.
         Transaction().apply(true);
         usleep(mBufferPostDelay);
     }

     int32_t mBufferPostDelay;

     friend class LayerRenderPathTestHarness;
 };

 } // namespace android
	/*
	* Copyright (C) 2019 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.
	*/

	#pragma once

	#include <gtest/gtest.h>
	#include <gui/ISurfaceComposer.h>
	#include <gui/SurfaceComposerClient.h>
	#include <private/gui/ComposerService.h>
	#include <ui/DisplayConfig.h>

	#include "BufferGenerator.h"
	#include "utils/ScreenshotUtils.h"
	#include "utils/TransactionUtils.h"

	namespace android {

	using android::hardware::graphics::common::V1_1::BufferUsage;

	class LayerTransactionTest : public ::testing::Test {
	protected:
	void SetUp() override {
	mClient = new SurfaceComposerClient;
	ASSERT_EQ(NO_ERROR, mClient->initCheck()) << "failed to create SurfaceComposerClient";

	ASSERT_NO_FATAL_FAILURE(SetUpDisplay());

	sp<ISurfaceComposer> sf(ComposerService::getComposerService());
	ASSERT_NO_FATAL_FAILURE(sf->getColorManagement(&mColorManagementUsed));
	}

	virtual void TearDown() {
	mBlackBgSurface = 0;
	mClient->dispose();
	mClient = 0;
	}

	virtual sp<SurfaceControl> createLayer(const sp<SurfaceComposerClient>& client,
	const char* name, uint32_t width, uint32_t height,
	uint32_t flags = 0, SurfaceControl* parent = nullptr,
	uint32_t* outTransformHint = nullptr,
	PixelFormat format = PIXEL_FORMAT_RGBA_8888) {
	auto layer =
	createSurface(client, name, width, height, format, flags, parent, outTransformHint);

	Transaction t;
	t.setLayerStack(layer, mDisplayLayerStack).setLayer(layer, mLayerZBase);

	status_t error = t.apply();
	if (error != NO_ERROR) {
	ADD_FAILURE() << "failed to initialize SurfaceControl";
	layer.clear();
	}

	return layer;
	}

	virtual sp<SurfaceControl> createSurface(const sp<SurfaceComposerClient>& client,
	const char* name, uint32_t width, uint32_t height,
	PixelFormat format, uint32_t flags,
	SurfaceControl* parent = nullptr,
	uint32_t* outTransformHint = nullptr) {
	auto layer = client->createSurface(String8(name), width, height, format, flags, parent,
	LayerMetadata(), outTransformHint);
	EXPECT_NE(nullptr, layer.get()) << "failed to create SurfaceControl";
	return layer;
	}

	virtual sp<SurfaceControl> createLayer(const char* name, uint32_t width, uint32_t height,
	uint32_t flags = 0, SurfaceControl* parent = nullptr,
	uint32_t* outTransformHint = nullptr,
	PixelFormat format = PIXEL_FORMAT_RGBA_8888) {
	return createLayer(mClient, name, width, height, flags, parent, outTransformHint, format);
	}

	sp<SurfaceControl> createColorLayer(const char* name, const Color& color,
	SurfaceControl* parent = nullptr) {
	auto colorLayer = createSurface(mClient, name, 0 /* buffer width /, 0 / buffer height */,
	PIXEL_FORMAT_RGBA_8888,
	ISurfaceComposerClient::eFXSurfaceEffect, parent);
	asTransaction([&](Transaction& t) {
	t.setColor(colorLayer, half3{color.r / 255.0f, color.g / 255.0f, color.b / 255.0f});
	t.setAlpha(colorLayer, color.a / 255.0f);
	});
	return colorLayer;
	}

	ANativeWindow_Buffer getBufferQueueLayerBuffer(const sp<SurfaceControl>& layer) {
	// wait for previous transactions (such as setSize) to complete
	Transaction().apply(true);

	ANativeWindow_Buffer buffer = {};
	EXPECT_EQ(NO_ERROR, layer->getSurface()->lock(&buffer, nullptr));

	return buffer;
	}

	void postBufferQueueLayerBuffer(const sp<SurfaceControl>& layer) {
	ASSERT_EQ(NO_ERROR, layer->getSurface()->unlockAndPost());

	// wait for the newly posted buffer to be latched
	waitForLayerBuffers();
	}

	virtual void fillBufferQueueLayerColor(const sp<SurfaceControl>& layer, const Color& color,
	int32_t bufferWidth, int32_t bufferHeight) {
	ANativeWindow_Buffer buffer;
	ASSERT_NO_FATAL_FAILURE(buffer = getBufferQueueLayerBuffer(layer));
	TransactionUtils::fillANativeWindowBufferColor(buffer,
	Rect(0, 0, bufferWidth, bufferHeight),
	color);
	postBufferQueueLayerBuffer(layer);
	}

	virtual void fillBufferStateLayerColor(const sp<SurfaceControl>& layer, const Color& color,
	int32_t bufferWidth, int32_t bufferHeight) {
	sp<GraphicBuffer> buffer =
	new GraphicBuffer(bufferWidth, bufferHeight, PIXEL_FORMAT_RGBA_8888, 1,
	BufferUsage::CPU_READ_OFTEN \| BufferUsage::CPU_WRITE_OFTEN \|
	BufferUsage::COMPOSER_OVERLAY,
	"test");
	TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, 0, bufferWidth, bufferHeight),
	color);
	Transaction().setBuffer(layer, buffer).apply();
	}

	void fillLayerColor(uint32_t mLayerType, const sp<SurfaceControl>& layer, const Color& color,
	int32_t bufferWidth, int32_t bufferHeight) {
	switch (mLayerType) {
	case ISurfaceComposerClient::eFXSurfaceBufferQueue:
	fillBufferQueueLayerColor(layer, color, bufferWidth, bufferHeight);
	break;
	case ISurfaceComposerClient::eFXSurfaceBufferState:
	fillBufferStateLayerColor(layer, color, bufferWidth, bufferHeight);
	break;
	default:
	ASSERT_TRUE(false) << "unsupported layer type: " << mLayerType;
	}
	}

	void fillLayerQuadrant(uint32_t mLayerType, const sp<SurfaceControl>& layer,
	int32_t bufferWidth, int32_t bufferHeight, const Color& topLeft,
	const Color& topRight, const Color& bottomLeft,
	const Color& bottomRight) {
	switch (mLayerType) {
	case ISurfaceComposerClient::eFXSurfaceBufferQueue:
	fillBufferQueueLayerQuadrant(layer, bufferWidth, bufferHeight, topLeft, topRight,
	bottomLeft, bottomRight);
	break;
	case ISurfaceComposerClient::eFXSurfaceBufferState:
	fillBufferStateLayerQuadrant(layer, bufferWidth, bufferHeight, topLeft, topRight,
	bottomLeft, bottomRight);
	break;
	default:
	ASSERT_TRUE(false) << "unsupported layer type: " << mLayerType;
	}
	}

	virtual void fillBufferQueueLayerQuadrant(const sp<SurfaceControl>& layer, int32_t bufferWidth,
	int32_t bufferHeight, const Color& topLeft,
	const Color& topRight, const Color& bottomLeft,
	const Color& bottomRight) {
	ANativeWindow_Buffer buffer;
	ASSERT_NO_FATAL_FAILURE(buffer = getBufferQueueLayerBuffer(layer));
	ASSERT_TRUE(bufferWidth % 2 == 0 && bufferHeight % 2 == 0);

	const int32_t halfW = bufferWidth / 2;
	const int32_t halfH = bufferHeight / 2;
	TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(0, 0, halfW, halfH), topLeft);
	TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(halfW, 0, bufferWidth, halfH),
	topRight);
	TransactionUtils::fillANativeWindowBufferColor(buffer, Rect(0, halfH, halfW, bufferHeight),
	bottomLeft);
	TransactionUtils::fillANativeWindowBufferColor(buffer,
	Rect(halfW, halfH, bufferWidth,
	bufferHeight),
	bottomRight);

	postBufferQueueLayerBuffer(layer);
	}

	virtual void fillBufferStateLayerQuadrant(const sp<SurfaceControl>& layer, int32_t bufferWidth,
	int32_t bufferHeight, const Color& topLeft,
	const Color& topRight, const Color& bottomLeft,
	const Color& bottomRight) {
	sp<GraphicBuffer> buffer =
	new GraphicBuffer(bufferWidth, bufferHeight, PIXEL_FORMAT_RGBA_8888, 1,
	BufferUsage::CPU_READ_OFTEN \| BufferUsage::CPU_WRITE_OFTEN \|
	BufferUsage::COMPOSER_OVERLAY,
	"test");

	ASSERT_TRUE(bufferWidth % 2 == 0 && bufferHeight % 2 == 0);

	const int32_t halfW = bufferWidth / 2;
	const int32_t halfH = bufferHeight / 2;
	TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, 0, halfW, halfH), topLeft);
	TransactionUtils::fillGraphicBufferColor(buffer, Rect(halfW, 0, bufferWidth, halfH),
	topRight);
	TransactionUtils::fillGraphicBufferColor(buffer, Rect(0, halfH, halfW, bufferHeight),
	bottomLeft);
	TransactionUtils::fillGraphicBufferColor(buffer,
	Rect(halfW, halfH, bufferWidth, bufferHeight),
	bottomRight);

	Transaction().setBuffer(layer, buffer).setSize(layer, bufferWidth, bufferHeight).apply();
	}

	std::unique_ptr<ScreenCapture> screenshot() {
	std::unique_ptr<ScreenCapture> screenshot;
	ScreenCapture::captureScreen(&screenshot);
	return screenshot;
	}

	void asTransaction(const std::function<void(Transaction&)>& exec) {
	Transaction t;
	exec(t);
	t.apply(true);
	}

	static status_t getBuffer(sp<GraphicBuffer>* outBuffer, sp<Fence>* outFence) {
	static BufferGenerator bufferGenerator;
	return bufferGenerator.get(outBuffer, outFence);
	}

	sp<SurfaceComposerClient> mClient;

	sp<IBinder> mDisplay;
	uint32_t mDisplayWidth;
	uint32_t mDisplayHeight;
	uint32_t mDisplayLayerStack;
	Rect mDisplayRect = Rect::INVALID_RECT;

	// leave room for ~256 layers
	const int32_t mLayerZBase = std::numeric_limits<int32_t>::max() - 256;

	sp<SurfaceControl> mBlackBgSurface;
	bool mColorManagementUsed;

	private:
	void SetUpDisplay() {
	mDisplay = mClient->getInternalDisplayToken();
	ASSERT_FALSE(mDisplay == nullptr) << "failed to get display";

	DisplayConfig config;
	ASSERT_EQ(NO_ERROR, SurfaceComposerClient::getActiveDisplayConfig(mDisplay, &config));
	mDisplayRect = Rect(config.resolution);
	mDisplayWidth = mDisplayRect.getWidth();
	mDisplayHeight = mDisplayRect.getHeight();

	// After a new buffer is queued, SurfaceFlinger is notified and will
	// latch the new buffer on next vsync. Let's heuristically wait for 3
	// vsyncs.
	mBufferPostDelay = static_cast<int32_t>(1e6 / config.refreshRate) * 3;

	mDisplayLayerStack = 0;

	mBlackBgSurface =
	createSurface(mClient, "BaseSurface", 0 /* buffer width /, 0 / buffer height */,
	PIXEL_FORMAT_RGBA_8888, ISurfaceComposerClient::eFXSurfaceEffect);

	// set layer stack (b/68888219)
	Transaction t;
	t.setDisplayLayerStack(mDisplay, mDisplayLayerStack);
	t.setCrop_legacy(mBlackBgSurface, Rect(0, 0, mDisplayWidth, mDisplayHeight));
	t.setLayerStack(mBlackBgSurface, mDisplayLayerStack);
	t.setColor(mBlackBgSurface, half3{0, 0, 0});
	t.setLayer(mBlackBgSurface, mLayerZBase);
	t.apply();
	}

	void waitForLayerBuffers() {
	// Request an empty transaction to get applied synchronously to ensure the buffer is
	// latched.
	Transaction().apply(true);
	usleep(mBufferPostDelay);
	}

	int32_t mBufferPostDelay;

	friend class LayerRenderPathTestHarness;
	};

	} // namespace android