libs/hwui/Readback.cpp - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "Readback.h"

 #include <sync/sync.h>
 #include <system/window.h>

 #include <gui/TraceUtils.h>
 #include "DeferredLayerUpdater.h"
 #include "Properties.h"
 #include "hwui/Bitmap.h"
 #include "pipeline/skia/LayerDrawable.h"
 #include "renderthread/EglManager.h"
 #include "renderthread/VulkanManager.h"
 #include "utils/Color.h"
 #include "utils/MathUtils.h"
 #include "utils/NdkUtils.h"

 using namespace android::uirenderer::renderthread;

 namespace android {
 namespace uirenderer {

 #define ARECT_ARGS(r) float((r).left), float((r).top), float((r).right), float((r).bottom)

 CopyResult Readback::copySurfaceInto(ANativeWindow* window, const Rect& inSrcRect,
                                      SkBitmap* bitmap) {
     ATRACE_CALL();
     // Setup the source
     AHardwareBuffer* rawSourceBuffer;
     int rawSourceFence;
     ARect cropRect;
     uint32_t windowTransform;
     status_t err = ANativeWindow_getLastQueuedBuffer2(window, &rawSourceBuffer, &rawSourceFence,
                                                       &cropRect, &windowTransform);
     base::unique_fd sourceFence(rawSourceFence);
     // Really this shouldn't ever happen, but better safe than sorry.
     if (err == UNKNOWN_TRANSACTION) {
         ALOGW("Readback failed to ANativeWindow_getLastQueuedBuffer2 - who are we talking to?");
         return copySurfaceIntoLegacy(window, inSrcRect, bitmap);
     }
     ALOGV("Using new path, cropRect=" RECT_STRING ", transform=%x", ARECT_ARGS(cropRect),
           windowTransform);

     if (err != NO_ERROR) {
         ALOGW("Failed to get last queued buffer, error = %d", err);
         return CopyResult::UnknownError;
     }
     if (rawSourceBuffer == nullptr) {
         ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
         return CopyResult::SourceEmpty;
     }
     UniqueAHardwareBuffer sourceBuffer{rawSourceBuffer};
     AHardwareBuffer_Desc description;
     AHardwareBuffer_describe(sourceBuffer.get(), &description);
     if (description.usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
         ALOGW("Surface is protected, unable to copy from it");
         return CopyResult::SourceInvalid;
     }

     if (sourceFence != -1 && sync_wait(sourceFence.get(), 500 /* ms */) != NO_ERROR) {
         ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
         return CopyResult::Timeout;
     }

     sk_sp<SkColorSpace> colorSpace = DataSpaceToColorSpace(
             static_cast<android_dataspace>(ANativeWindow_getBuffersDataSpace(window)));
     sk_sp<SkImage> image =
             SkImage::MakeFromAHardwareBuffer(sourceBuffer.get(), kPremul_SkAlphaType, colorSpace);

     if (!image.get()) {
         return CopyResult::UnknownError;
     }

     sk_sp<GrDirectContext> grContext = mRenderThread.requireGrContext();

     SkRect srcRect = inSrcRect.toSkRect();

     SkRect imageSrcRect =
             SkRect::MakeLTRB(cropRect.left, cropRect.top, cropRect.right, cropRect.bottom);
     if (imageSrcRect.isEmpty()) {
         imageSrcRect = SkRect::MakeIWH(description.width, description.height);
     }
     ALOGV("imageSrcRect = " RECT_STRING, SK_RECT_ARGS(imageSrcRect));

     // Represents the "logical" width/height of the texture. That is, the dimensions of the buffer
     // after respecting crop & rotate. flipV/flipH still result in the same width & height
     // so we can ignore those for this.
     const SkRect textureRect =
             (windowTransform & NATIVE_WINDOW_TRANSFORM_ROT_90)
                     ? SkRect::MakeIWH(imageSrcRect.height(), imageSrcRect.width())
                     : SkRect::MakeIWH(imageSrcRect.width(), imageSrcRect.height());

     if (srcRect.isEmpty()) {
         srcRect = textureRect;
     } else {
         ALOGV("intersecting " RECT_STRING " with " RECT_STRING, SK_RECT_ARGS(srcRect),
               SK_RECT_ARGS(textureRect));
         if (!srcRect.intersect(textureRect)) {
             return CopyResult::UnknownError;
         }
     }

     sk_sp<SkSurface> tmpSurface =
             SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
                                         bitmap->info(), 0, kTopLeft_GrSurfaceOrigin, nullptr);

     // if we can't generate a GPU surface that matches the destination bitmap (e.g. 565) then we
     // attempt to do the intermediate rendering step in 8888
     if (!tmpSurface.get()) {
         SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
         tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
                                                  tmpInfo, 0, kTopLeft_GrSurfaceOrigin, nullptr);
         if (!tmpSurface.get()) {
             ALOGW("Unable to generate GPU buffer in a format compatible with the provided bitmap");
             return CopyResult::UnknownError;
         }
     }

     /*
      * The grand ordering of events.
      * First we apply the buffer's crop, done by using a srcRect of the crop with a dstRect of the
      * same width/height as the srcRect but with a 0x0 origin
      *
      * Second we apply the window transform via a Canvas matrix. Ordering for that is as follows:
      *  1) FLIP_H
      *  2) FLIP_V
      *  3) ROT_90
      * as per GLConsumer::computeTransformMatrix
      *
      * Third we apply the user's supplied cropping & scale to the output by doing a RectToRect
      * matrix transform from srcRect to {0,0, bitmapWidth, bitmapHeight}
      *
      * Finally we're done messing with this bloody thing for hopefully the last time.
      *
      * That's a lie since...
      * TODO: Do all this same stuff for TextureView as it's strictly more correct & easier
      * to rationalize. And we can fix the 1-px crop bug.
      */

     SkMatrix m;
     const SkRect imageDstRect = SkRect::MakeIWH(imageSrcRect.width(), imageSrcRect.height());
     const float px = imageDstRect.centerX();
     const float py = imageDstRect.centerY();
     if (windowTransform & NATIVE_WINDOW_TRANSFORM_FLIP_H) {
         m.postScale(-1.f, 1.f, px, py);
     }
     if (windowTransform & NATIVE_WINDOW_TRANSFORM_FLIP_V) {
         m.postScale(1.f, -1.f, px, py);
     }
     if (windowTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
         m.postRotate(90, 0, 0);
         m.postTranslate(imageDstRect.height(), 0);
     }

     SkSamplingOptions sampling(SkFilterMode::kNearest);
     ALOGV("Mapping from " RECT_STRING " to " RECT_STRING, SK_RECT_ARGS(srcRect),
           SK_RECT_ARGS(SkRect::MakeWH(bitmap->width(), bitmap->height())));
     m.postConcat(SkMatrix::MakeRectToRect(srcRect,
                                           SkRect::MakeWH(bitmap->width(), bitmap->height()),
                                           SkMatrix::kFill_ScaleToFit));
     if (srcRect.width() != bitmap->width() || srcRect.height() != bitmap->height()) {
         sampling = SkSamplingOptions(SkFilterMode::kLinear);
     }

     SkCanvas* canvas = tmpSurface->getCanvas();
     canvas->save();
     canvas->concat(m);
     SkPaint paint;
     paint.setAlpha(255);
     paint.setBlendMode(SkBlendMode::kSrc);
     const bool hasBufferCrop = cropRect.left < cropRect.right && cropRect.top < cropRect.bottom;
     auto constraint =
             hasBufferCrop ? SkCanvas::kStrict_SrcRectConstraint : SkCanvas::kFast_SrcRectConstraint;
     canvas->drawImageRect(image, imageSrcRect, imageDstRect, sampling, &paint, constraint);
     canvas->restore();

     if (!tmpSurface->readPixels(*bitmap, 0, 0)) {
         // if we fail to readback from the GPU directly (e.g. 565) then we attempt to read into
         // 8888 and then convert that into the destination format before giving up.
         SkBitmap tmpBitmap;
         SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
         if (bitmap->info().colorType() == SkColorType::kN32_SkColorType ||
             !tmpBitmap.tryAllocPixels(tmpInfo) || !tmpSurface->readPixels(tmpBitmap, 0, 0) ||
             !tmpBitmap.readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
             ALOGW("Unable to convert content into the provided bitmap");
             return CopyResult::UnknownError;
         }
     }

     bitmap->notifyPixelsChanged();

     return CopyResult::Success;
 }

 CopyResult Readback::copySurfaceIntoLegacy(ANativeWindow* window, const Rect& srcRect,
                                            SkBitmap* bitmap) {
     // Setup the source
     AHardwareBuffer* rawSourceBuffer;
     int rawSourceFence;
     Matrix4 texTransform;
     status_t err = ANativeWindow_getLastQueuedBuffer(window, &rawSourceBuffer, &rawSourceFence,
                                                      texTransform.data);
     base::unique_fd sourceFence(rawSourceFence);
     texTransform.invalidateType();
     if (err != NO_ERROR) {
         ALOGW("Failed to get last queued buffer, error = %d", err);
         return CopyResult::UnknownError;
     }
     if (rawSourceBuffer == nullptr) {
         ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
         return CopyResult::SourceEmpty;
     }

     UniqueAHardwareBuffer sourceBuffer{rawSourceBuffer};
     AHardwareBuffer_Desc description;
     AHardwareBuffer_describe(sourceBuffer.get(), &description);
     if (description.usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
         ALOGW("Surface is protected, unable to copy from it");
         return CopyResult::SourceInvalid;
     }

     if (sourceFence != -1 && sync_wait(sourceFence.get(), 500 /* ms */) != NO_ERROR) {
         ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
         return CopyResult::Timeout;
     }

     sk_sp<SkColorSpace> colorSpace = DataSpaceToColorSpace(
             static_cast<android_dataspace>(ANativeWindow_getBuffersDataSpace(window)));
     sk_sp<SkImage> image =
             SkImage::MakeFromAHardwareBuffer(sourceBuffer.get(), kPremul_SkAlphaType, colorSpace);
     return copyImageInto(image, texTransform, srcRect, bitmap);
 }

 CopyResult Readback::copyHWBitmapInto(Bitmap* hwBitmap, SkBitmap* bitmap) {
     LOG_ALWAYS_FATAL_IF(!hwBitmap->isHardware());

     Rect srcRect;
     Matrix4 transform;
     transform.loadScale(1, -1, 1);
     transform.translate(0, -1);

     return copyImageInto(hwBitmap->makeImage(), transform, srcRect, bitmap);
 }

 CopyResult Readback::copyLayerInto(DeferredLayerUpdater* deferredLayer, SkBitmap* bitmap) {
     ATRACE_CALL();
     if (!mRenderThread.getGrContext()) {
         return CopyResult::UnknownError;
     }

     // acquire most recent buffer for drawing
     deferredLayer->updateTexImage();
     deferredLayer->apply();
     const SkRect dstRect = SkRect::MakeIWH(bitmap->width(), bitmap->height());
     CopyResult copyResult = CopyResult::UnknownError;
     Layer* layer = deferredLayer->backingLayer();
     if (layer) {
         if (copyLayerInto(layer, nullptr, &dstRect, bitmap)) {
             copyResult = CopyResult::Success;
         }
     }
     return copyResult;
 }

 CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, SkBitmap* bitmap) {
     Rect srcRect;
     Matrix4 transform;
     transform.loadScale(1, -1, 1);
     transform.translate(0, -1);
     return copyImageInto(image, transform, srcRect, bitmap);
 }

 CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, Matrix4& texTransform,
                                    const Rect& srcRect, SkBitmap* bitmap) {
     ATRACE_CALL();
     if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaGL) {
         mRenderThread.requireGlContext();
     } else {
         mRenderThread.requireVkContext();
     }
     if (!image.get()) {
         return CopyResult::UnknownError;
     }
     int imgWidth = image->width();
     int imgHeight = image->height();
     sk_sp<GrDirectContext> grContext = sk_ref_sp(mRenderThread.getGrContext());

     CopyResult copyResult = CopyResult::UnknownError;

     int displayedWidth = imgWidth, displayedHeight = imgHeight;
     // If this is a 90 or 270 degree rotation we need to swap width/height to get the device
     // size.
     if (texTransform[Matrix4::kSkewX] >= 0.5f || texTransform[Matrix4::kSkewX] <= -0.5f) {
         std::swap(displayedWidth, displayedHeight);
     }
     SkRect skiaDestRect = SkRect::MakeWH(bitmap->width(), bitmap->height());
     SkRect skiaSrcRect = srcRect.toSkRect();
     if (skiaSrcRect.isEmpty()) {
         skiaSrcRect = SkRect::MakeIWH(displayedWidth, displayedHeight);
     }
     bool srcNotEmpty = skiaSrcRect.intersect(SkRect::MakeIWH(displayedWidth, displayedHeight));
     if (!srcNotEmpty) {
         return copyResult;
     }

     Layer layer(mRenderThread.renderState(), nullptr, 255, SkBlendMode::kSrc);
     layer.setSize(displayedWidth, displayedHeight);
     texTransform.copyTo(layer.getTexTransform());
     layer.setImage(image);
     // Scaling filter is not explicitly set here, because it is done inside copyLayerInfo
     // after checking the necessity based on the src/dest rect size and the transformation.
     if (copyLayerInto(&layer, &skiaSrcRect, &skiaDestRect, bitmap)) {
         copyResult = CopyResult::Success;
     }

     return copyResult;
 }

 bool Readback::copyLayerInto(Layer* layer, const SkRect* srcRect, const SkRect* dstRect,
                              SkBitmap* bitmap) {
     /* This intermediate surface is present to work around limitations that LayerDrawable expects
      * to render into a GPU backed canvas.  Additionally, the offscreen buffer solution works around
      * a scaling issue (b/62262733) that was encountered when sampling from an EGLImage into a
      * software buffer.
      */
     sk_sp<SkSurface> tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(),
                                                               SkBudgeted::kYes, bitmap->info(), 0,
                                                               kTopLeft_GrSurfaceOrigin, nullptr);

     // if we can't generate a GPU surface that matches the destination bitmap (e.g. 565) then we
     // attempt to do the intermediate rendering step in 8888
     if (!tmpSurface.get()) {
         SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
         tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
                                                  tmpInfo, 0, kTopLeft_GrSurfaceOrigin, nullptr);
         if (!tmpSurface.get()) {
             ALOGW("Unable to generate GPU buffer in a format compatible with the provided bitmap");
             return false;
         }
     }

     if (!skiapipeline::LayerDrawable::DrawLayer(mRenderThread.getGrContext(),
                                                 tmpSurface->getCanvas(), layer, srcRect, dstRect,
                                                 false)) {
         ALOGW("Unable to draw content from GPU into the provided bitmap");
         return false;
     }

     if (!tmpSurface->readPixels(*bitmap, 0, 0)) {
         // if we fail to readback from the GPU directly (e.g. 565) then we attempt to read into
         // 8888 and then convert that into the destination format before giving up.
         SkBitmap tmpBitmap;
         SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
         if (bitmap->info().colorType() == SkColorType::kN32_SkColorType ||
                 !tmpBitmap.tryAllocPixels(tmpInfo) ||
                 !tmpSurface->readPixels(tmpBitmap, 0, 0) ||
                 !tmpBitmap.readPixels(bitmap->info(), bitmap->getPixels(),
                                       bitmap->rowBytes(), 0, 0)) {
             ALOGW("Unable to convert content into the provided bitmap");
             return false;
         }
     }

     bitmap->notifyPixelsChanged();
     return true;
 }

 } /* namespace uirenderer */
 } /* namespace android */
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "Readback.h"

	#include <sync/sync.h>
	#include <system/window.h>

	#include <gui/TraceUtils.h>
	#include "DeferredLayerUpdater.h"
	#include "Properties.h"
	#include "hwui/Bitmap.h"
	#include "pipeline/skia/LayerDrawable.h"
	#include "renderthread/EglManager.h"
	#include "renderthread/VulkanManager.h"
	#include "utils/Color.h"
	#include "utils/MathUtils.h"
	#include "utils/NdkUtils.h"

	using namespace android::uirenderer::renderthread;

	namespace android {
	namespace uirenderer {

	#define ARECT_ARGS(r) float((r).left), float((r).top), float((r).right), float((r).bottom)

	CopyResult Readback::copySurfaceInto(ANativeWindow* window, const Rect& inSrcRect,
	SkBitmap* bitmap) {
	ATRACE_CALL();
	// Setup the source
	AHardwareBuffer* rawSourceBuffer;
	int rawSourceFence;
	ARect cropRect;
	uint32_t windowTransform;
	status_t err = ANativeWindow_getLastQueuedBuffer2(window, &rawSourceBuffer, &rawSourceFence,
	&cropRect, &windowTransform);
	base::unique_fd sourceFence(rawSourceFence);
	// Really this shouldn't ever happen, but better safe than sorry.
	if (err == UNKNOWN_TRANSACTION) {
	ALOGW("Readback failed to ANativeWindow_getLastQueuedBuffer2 - who are we talking to?");
	return copySurfaceIntoLegacy(window, inSrcRect, bitmap);
	}
	ALOGV("Using new path, cropRect=" RECT_STRING ", transform=%x", ARECT_ARGS(cropRect),
	windowTransform);

	if (err != NO_ERROR) {
	ALOGW("Failed to get last queued buffer, error = %d", err);
	return CopyResult::UnknownError;
	}
	if (rawSourceBuffer == nullptr) {
	ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
	return CopyResult::SourceEmpty;
	}
	UniqueAHardwareBuffer sourceBuffer{rawSourceBuffer};
	AHardwareBuffer_Desc description;
	AHardwareBuffer_describe(sourceBuffer.get(), &description);
	if (description.usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
	ALOGW("Surface is protected, unable to copy from it");
	return CopyResult::SourceInvalid;
	}

	if (sourceFence != -1 && sync_wait(sourceFence.get(), 500 /* ms */) != NO_ERROR) {
	ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
	return CopyResult::Timeout;
	}

	sk_sp<SkColorSpace> colorSpace = DataSpaceToColorSpace(
	static_cast<android_dataspace>(ANativeWindow_getBuffersDataSpace(window)));
	sk_sp<SkImage> image =
	SkImage::MakeFromAHardwareBuffer(sourceBuffer.get(), kPremul_SkAlphaType, colorSpace);

	if (!image.get()) {
	return CopyResult::UnknownError;
	}

	sk_sp<GrDirectContext> grContext = mRenderThread.requireGrContext();

	SkRect srcRect = inSrcRect.toSkRect();

	SkRect imageSrcRect =
	SkRect::MakeLTRB(cropRect.left, cropRect.top, cropRect.right, cropRect.bottom);
	if (imageSrcRect.isEmpty()) {
	imageSrcRect = SkRect::MakeIWH(description.width, description.height);
	}
	ALOGV("imageSrcRect = " RECT_STRING, SK_RECT_ARGS(imageSrcRect));

	// Represents the "logical" width/height of the texture. That is, the dimensions of the buffer
	// after respecting crop & rotate. flipV/flipH still result in the same width & height
	// so we can ignore those for this.
	const SkRect textureRect =
	(windowTransform & NATIVE_WINDOW_TRANSFORM_ROT_90)
	? SkRect::MakeIWH(imageSrcRect.height(), imageSrcRect.width())
	: SkRect::MakeIWH(imageSrcRect.width(), imageSrcRect.height());

	if (srcRect.isEmpty()) {
	srcRect = textureRect;
	} else {
	ALOGV("intersecting " RECT_STRING " with " RECT_STRING, SK_RECT_ARGS(srcRect),
	SK_RECT_ARGS(textureRect));
	if (!srcRect.intersect(textureRect)) {
	return CopyResult::UnknownError;
	}
	}

	sk_sp<SkSurface> tmpSurface =
	SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
	bitmap->info(), 0, kTopLeft_GrSurfaceOrigin, nullptr);

	// if we can't generate a GPU surface that matches the destination bitmap (e.g. 565) then we
	// attempt to do the intermediate rendering step in 8888
	if (!tmpSurface.get()) {
	SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
	tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
	tmpInfo, 0, kTopLeft_GrSurfaceOrigin, nullptr);
	if (!tmpSurface.get()) {
	ALOGW("Unable to generate GPU buffer in a format compatible with the provided bitmap");
	return CopyResult::UnknownError;
	}
	}

	/*
	* The grand ordering of events.
	* First we apply the buffer's crop, done by using a srcRect of the crop with a dstRect of the
	* same width/height as the srcRect but with a 0x0 origin
	*
	* Second we apply the window transform via a Canvas matrix. Ordering for that is as follows:
	* 1) FLIP_H
	* 2) FLIP_V
	* 3) ROT_90
	* as per GLConsumer::computeTransformMatrix
	*
	* Third we apply the user's supplied cropping & scale to the output by doing a RectToRect
	* matrix transform from srcRect to {0,0, bitmapWidth, bitmapHeight}
	*
	* Finally we're done messing with this bloody thing for hopefully the last time.
	*
	* That's a lie since...
	* TODO: Do all this same stuff for TextureView as it's strictly more correct & easier
	* to rationalize. And we can fix the 1-px crop bug.
	*/

	SkMatrix m;
	const SkRect imageDstRect = SkRect::MakeIWH(imageSrcRect.width(), imageSrcRect.height());
	const float px = imageDstRect.centerX();
	const float py = imageDstRect.centerY();
	if (windowTransform & NATIVE_WINDOW_TRANSFORM_FLIP_H) {
	m.postScale(-1.f, 1.f, px, py);
	}
	if (windowTransform & NATIVE_WINDOW_TRANSFORM_FLIP_V) {
	m.postScale(1.f, -1.f, px, py);
	}
	if (windowTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
	m.postRotate(90, 0, 0);
	m.postTranslate(imageDstRect.height(), 0);
	}

	SkSamplingOptions sampling(SkFilterMode::kNearest);
	ALOGV("Mapping from " RECT_STRING " to " RECT_STRING, SK_RECT_ARGS(srcRect),
	SK_RECT_ARGS(SkRect::MakeWH(bitmap->width(), bitmap->height())));
	m.postConcat(SkMatrix::MakeRectToRect(srcRect,
	SkRect::MakeWH(bitmap->width(), bitmap->height()),
	SkMatrix::kFill_ScaleToFit));
	if (srcRect.width() != bitmap->width() \|\| srcRect.height() != bitmap->height()) {
	sampling = SkSamplingOptions(SkFilterMode::kLinear);
	}

	SkCanvas* canvas = tmpSurface->getCanvas();
	canvas->save();
	canvas->concat(m);
	SkPaint paint;
	paint.setAlpha(255);
	paint.setBlendMode(SkBlendMode::kSrc);
	const bool hasBufferCrop = cropRect.left < cropRect.right && cropRect.top < cropRect.bottom;
	auto constraint =
	hasBufferCrop ? SkCanvas::kStrict_SrcRectConstraint : SkCanvas::kFast_SrcRectConstraint;
	canvas->drawImageRect(image, imageSrcRect, imageDstRect, sampling, &paint, constraint);
	canvas->restore();

	if (!tmpSurface->readPixels(*bitmap, 0, 0)) {
	// if we fail to readback from the GPU directly (e.g. 565) then we attempt to read into
	// 8888 and then convert that into the destination format before giving up.
	SkBitmap tmpBitmap;
	SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
	if (bitmap->info().colorType() == SkColorType::kN32_SkColorType \|\|
	!tmpBitmap.tryAllocPixels(tmpInfo) \|\| !tmpSurface->readPixels(tmpBitmap, 0, 0) \|\|
	!tmpBitmap.readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
	ALOGW("Unable to convert content into the provided bitmap");
	return CopyResult::UnknownError;
	}
	}

	bitmap->notifyPixelsChanged();

	return CopyResult::Success;
	}

	CopyResult Readback::copySurfaceIntoLegacy(ANativeWindow* window, const Rect& srcRect,
	SkBitmap* bitmap) {
	// Setup the source
	AHardwareBuffer* rawSourceBuffer;
	int rawSourceFence;
	Matrix4 texTransform;
	status_t err = ANativeWindow_getLastQueuedBuffer(window, &rawSourceBuffer, &rawSourceFence,
	texTransform.data);
	base::unique_fd sourceFence(rawSourceFence);
	texTransform.invalidateType();
	if (err != NO_ERROR) {
	ALOGW("Failed to get last queued buffer, error = %d", err);
	return CopyResult::UnknownError;
	}
	if (rawSourceBuffer == nullptr) {
	ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
	return CopyResult::SourceEmpty;
	}

	UniqueAHardwareBuffer sourceBuffer{rawSourceBuffer};
	AHardwareBuffer_Desc description;
	AHardwareBuffer_describe(sourceBuffer.get(), &description);
	if (description.usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
	ALOGW("Surface is protected, unable to copy from it");
	return CopyResult::SourceInvalid;
	}

	if (sourceFence != -1 && sync_wait(sourceFence.get(), 500 /* ms */) != NO_ERROR) {
	ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
	return CopyResult::Timeout;
	}

	sk_sp<SkColorSpace> colorSpace = DataSpaceToColorSpace(
	static_cast<android_dataspace>(ANativeWindow_getBuffersDataSpace(window)));
	sk_sp<SkImage> image =
	SkImage::MakeFromAHardwareBuffer(sourceBuffer.get(), kPremul_SkAlphaType, colorSpace);
	return copyImageInto(image, texTransform, srcRect, bitmap);
	}

	CopyResult Readback::copyHWBitmapInto(Bitmap* hwBitmap, SkBitmap* bitmap) {
	LOG_ALWAYS_FATAL_IF(!hwBitmap->isHardware());

	Rect srcRect;
	Matrix4 transform;
	transform.loadScale(1, -1, 1);
	transform.translate(0, -1);

	return copyImageInto(hwBitmap->makeImage(), transform, srcRect, bitmap);
	}

	CopyResult Readback::copyLayerInto(DeferredLayerUpdater* deferredLayer, SkBitmap* bitmap) {
	ATRACE_CALL();
	if (!mRenderThread.getGrContext()) {
	return CopyResult::UnknownError;
	}

	// acquire most recent buffer for drawing
	deferredLayer->updateTexImage();
	deferredLayer->apply();
	const SkRect dstRect = SkRect::MakeIWH(bitmap->width(), bitmap->height());
	CopyResult copyResult = CopyResult::UnknownError;
	Layer* layer = deferredLayer->backingLayer();
	if (layer) {
	if (copyLayerInto(layer, nullptr, &dstRect, bitmap)) {
	copyResult = CopyResult::Success;
	}
	}
	return copyResult;
	}

	CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, SkBitmap* bitmap) {
	Rect srcRect;
	Matrix4 transform;
	transform.loadScale(1, -1, 1);
	transform.translate(0, -1);
	return copyImageInto(image, transform, srcRect, bitmap);
	}

	CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, Matrix4& texTransform,
	const Rect& srcRect, SkBitmap* bitmap) {
	ATRACE_CALL();
	if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaGL) {
	mRenderThread.requireGlContext();
	} else {
	mRenderThread.requireVkContext();
	}
	if (!image.get()) {
	return CopyResult::UnknownError;
	}
	int imgWidth = image->width();
	int imgHeight = image->height();
	sk_sp<GrDirectContext> grContext = sk_ref_sp(mRenderThread.getGrContext());

	CopyResult copyResult = CopyResult::UnknownError;

	int displayedWidth = imgWidth, displayedHeight = imgHeight;
	// If this is a 90 or 270 degree rotation we need to swap width/height to get the device
	// size.
	if (texTransform[Matrix4::kSkewX] >= 0.5f \|\| texTransform[Matrix4::kSkewX] <= -0.5f) {
	std::swap(displayedWidth, displayedHeight);
	}
	SkRect skiaDestRect = SkRect::MakeWH(bitmap->width(), bitmap->height());
	SkRect skiaSrcRect = srcRect.toSkRect();
	if (skiaSrcRect.isEmpty()) {
	skiaSrcRect = SkRect::MakeIWH(displayedWidth, displayedHeight);
	}
	bool srcNotEmpty = skiaSrcRect.intersect(SkRect::MakeIWH(displayedWidth, displayedHeight));
	if (!srcNotEmpty) {
	return copyResult;
	}

	Layer layer(mRenderThread.renderState(), nullptr, 255, SkBlendMode::kSrc);
	layer.setSize(displayedWidth, displayedHeight);
	texTransform.copyTo(layer.getTexTransform());
	layer.setImage(image);
	// Scaling filter is not explicitly set here, because it is done inside copyLayerInfo
	// after checking the necessity based on the src/dest rect size and the transformation.
	if (copyLayerInto(&layer, &skiaSrcRect, &skiaDestRect, bitmap)) {
	copyResult = CopyResult::Success;
	}

	return copyResult;
	}

	bool Readback::copyLayerInto(Layer* layer, const SkRect* srcRect, const SkRect* dstRect,
	SkBitmap* bitmap) {
	/* This intermediate surface is present to work around limitations that LayerDrawable expects
	* to render into a GPU backed canvas. Additionally, the offscreen buffer solution works around
	* a scaling issue (b/62262733) that was encountered when sampling from an EGLImage into a
	* software buffer.
	*/
	sk_sp<SkSurface> tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(),
	SkBudgeted::kYes, bitmap->info(), 0,
	kTopLeft_GrSurfaceOrigin, nullptr);

	// if we can't generate a GPU surface that matches the destination bitmap (e.g. 565) then we
	// attempt to do the intermediate rendering step in 8888
	if (!tmpSurface.get()) {
	SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
	tmpSurface = SkSurface::MakeRenderTarget(mRenderThread.getGrContext(), SkBudgeted::kYes,
	tmpInfo, 0, kTopLeft_GrSurfaceOrigin, nullptr);
	if (!tmpSurface.get()) {
	ALOGW("Unable to generate GPU buffer in a format compatible with the provided bitmap");
	return false;
	}
	}

	if (!skiapipeline::LayerDrawable::DrawLayer(mRenderThread.getGrContext(),
	tmpSurface->getCanvas(), layer, srcRect, dstRect,
	false)) {
	ALOGW("Unable to draw content from GPU into the provided bitmap");
	return false;
	}

	if (!tmpSurface->readPixels(*bitmap, 0, 0)) {
	// if we fail to readback from the GPU directly (e.g. 565) then we attempt to read into
	// 8888 and then convert that into the destination format before giving up.
	SkBitmap tmpBitmap;
	SkImageInfo tmpInfo = bitmap->info().makeColorType(SkColorType::kN32_SkColorType);
	if (bitmap->info().colorType() == SkColorType::kN32_SkColorType \|\|
	!tmpBitmap.tryAllocPixels(tmpInfo) \|\|
	!tmpSurface->readPixels(tmpBitmap, 0, 0) \|\|
	!tmpBitmap.readPixels(bitmap->info(), bitmap->getPixels(),
	bitmap->rowBytes(), 0, 0)) {
	ALOGW("Unable to convert content into the provided bitmap");
	return false;
	}
	}

	bitmap->notifyPixelsChanged();
	return true;
	}

	} /* namespace uirenderer */
	} /* namespace android */