gm/asyncrescaleandread.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2019 Google LLC
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "gm/gm.h"
 #include "include/core/SkCanvas.h"
 #include "include/core/SkColor.h"
 #include "include/core/SkPaint.h"
 #include "include/core/SkRect.h"
 #include "include/core/SkSurface.h"
 #include "include/core/SkYUVAIndex.h"
 #include "include/gpu/GrContext.h"
 #include "src/core/SkAutoPixmapStorage.h"
 #include "src/core/SkConvertPixels.h"
 #include "src/core/SkScopeExit.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrGpu.h"
 #include "tools/Resources.h"
 #include "tools/ToolUtils.h"

 // Draws the image to a surface, does a asyncRescaleAndReadPixels of the image, and then sticks
 // the result in a raster image.
 static sk_sp<SkImage> do_read_and_scale(SkSurface* surface, const SkIRect& srcRect,
                                         const SkImageInfo& ii, SkSurface::RescaleGamma rescaleGamma,
                                         SkFilterQuality quality) {
     SkBitmap bmp;
     bmp.allocPixels(ii);
     SkPaint paint;
     paint.setBlendMode(SkBlendMode::kSrc);
     struct Context {
         SkPixmap fPixmap;
         bool fCalled = false;
         bool fSucceeded = false;
     } context;
     SkAssertResult(bmp.peekPixels(&context.fPixmap));
     auto callback = [](void* c, const void* data, size_t rowBytes) {
         auto context = reinterpret_cast<Context*>(c);
         context->fCalled = true;
         if (!data) {
             context->fPixmap.reset();
             return;
         }
         context->fSucceeded = true;
         SkRectMemcpy(context->fPixmap.writable_addr(), context->fPixmap.rowBytes(), data, rowBytes,
                      context->fPixmap.info().minRowBytes(), context->fPixmap.height());
     };
     surface->asyncRescaleAndReadPixels(ii, srcRect, rescaleGamma, quality, callback, &context);
     while (!context.fCalled) {
         // Only GPU should actually be asynchronous.
         SkASSERT(surface->getCanvas()->getGrContext());
         surface->getCanvas()->getGrContext()->checkAsyncWorkCompletion();
     }
     return context.fSucceeded ? SkImage::MakeFromBitmap(bmp) : nullptr;
 }

 static sk_sp<SkImage> do_read_and_scale_yuv(SkSurface* surface, SkYUVColorSpace yuvCS,
                                             const SkIRect& srcRect, int dstW, int dstH,
                                             SkSurface::RescaleGamma rescaleGamma,
                                             SkFilterQuality quality, SkScopeExit* cleanup) {
     SkASSERT(!(dstW & 0b1) && !(dstH & 0b1));
     std::unique_ptr<uint8_t[]> yData(new uint8_t[dstW * dstH]);
     std::unique_ptr<uint8_t[]> uData(new uint8_t[dstW / 2 * dstH / 2]);
     std::unique_ptr<uint8_t[]> vData(new uint8_t[dstW / 2 * dstH / 2]);
     struct Context {
         int fW;
         int fH;
         uint8_t* fYData;
         uint8_t* fUData;
         uint8_t* fVData;
         bool fCalled = false;
         bool fSucceeded = false;
     } context{dstW, dstH, yData.get(), uData.get(), vData.get()};
     auto callback = [](void* c, const void* data[2], size_t rowBytes[2]) {
         auto context = reinterpret_cast<Context*>(c);
         context->fCalled = true;
         if (!data) {
             return;
         }
         context->fSucceeded = true;
         int w = context->fW;
         int h = context->fH;
         SkRectMemcpy(context->fYData, w, data[0], rowBytes[0], w, h);
         SkRectMemcpy(context->fUData, w / 2, data[1], rowBytes[1], w / 2, h / 2);
         SkRectMemcpy(context->fVData, w / 2, data[2], rowBytes[2], w / 2, h / 2);
     };
     surface->asyncRescaleAndReadPixelsYUV420(yuvCS, SkColorSpace::MakeSRGB(), srcRect, dstW, dstH,
                                              rescaleGamma, quality, callback, &context);
     while (!context.fCalled) {
         // Only GPU should actually be asynchronous.
         SkASSERT(surface->getCanvas()->getGrContext());
         surface->getCanvas()->getGrContext()->checkAsyncWorkCompletion();
     }
     if (!context.fSucceeded) {
         return nullptr;
     }
     auto* gr = surface->getCanvas()->getGrContext();
     GrBackendTexture backendTextures[3];
     GrBackendFormat format = gr->priv().caps()->getBackendFormatFromColorType(kAlpha_8_SkColorType);
     backendTextures[0] = gr->priv().getGpu()->createBackendTexture(
             dstW, dstH, format, GrMipMapped::kNo, GrRenderable::kNo, yData.get(), 0, nullptr,
             GrProtected::kNo);
     backendTextures[1] = gr->priv().getGpu()->createBackendTexture(
             dstW / 2, dstH / 2, format, GrMipMapped::kNo, GrRenderable::kNo,
             uData.get(), 0, nullptr, GrProtected::kNo);
     backendTextures[2] = gr->priv().getGpu()->createBackendTexture(
             dstW / 2, dstH / 2, format, GrMipMapped::kNo, GrRenderable::kNo,
             vData.get(), 0, nullptr, GrProtected::kNo);
     auto config = gr->priv().caps()->getConfigFromBackendFormat(format, kAlpha_8_SkColorType);
     SkColorChannel channel;
     if (config == kAlpha_8_as_Red_GrPixelConfig) {
         channel = SkColorChannel::kR;
     } else {
         SkASSERT(config == kAlpha_8_as_Alpha_GrPixelConfig);
         channel = SkColorChannel::kA;
     }
     SkYUVAIndex indices[4]{{0, channel}, {1, channel}, {2, channel}, {-1, SkColorChannel::kR}};
     *cleanup = {[gr, backendTextures] {
         GrFlushInfo flushInfo;
         flushInfo.fFlags = kSyncCpu_GrFlushFlag;
         gr->flush(flushInfo);
         gr->deleteBackendTexture(backendTextures[0]);
         gr->deleteBackendTexture(backendTextures[1]);
         gr->deleteBackendTexture(backendTextures[2]);
     }};

     return SkImage::MakeFromYUVATextures(gr, yuvCS, backendTextures, indices, {dstW, dstH},
                                          kTopLeft_GrSurfaceOrigin, SkColorSpace::MakeSRGB());
 }

 // Draws a grid of rescales. The columns are none, low, and high filter quality. The rows are
 // rescale in src gamma and rescale in linear gamma.
 static skiagm::DrawResult do_rescale_grid(SkCanvas* canvas, SkSurface* surface,
                                           const SkIRect& srcRect, int newW, int newH, bool doYUV420,
                                           SkString* errorMsg, int pad = 0) {
     if (doYUV420) {
         if (!canvas->getGrContext() || !canvas->getGrContext()->priv().asDirectContext()) {
             errorMsg->printf("YUV420 only supported on direct GPU for now.");
             return skiagm::DrawResult::kSkip;
         }
     }
     if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
         *errorMsg = "Not supported on recording/vector backends.";
         return skiagm::DrawResult::kSkip;
     }
     const auto ii = canvas->imageInfo().makeWH(newW, newH);

     SkYUVColorSpace yuvColorSpace = kRec601_SkYUVColorSpace;
     canvas->save();
     for (auto gamma : {SkSurface::RescaleGamma::kSrc, SkSurface::RescaleGamma::kLinear}) {
         canvas->save();
         for (auto quality : {kNone_SkFilterQuality, kLow_SkFilterQuality, kHigh_SkFilterQuality}) {
             SkScopeExit cleanup;
             sk_sp<SkImage> result;
             if (doYUV420) {
                 result = do_read_and_scale_yuv(surface, yuvColorSpace, srcRect, newW, newH, gamma,
                                                quality, &cleanup);
                 if (!result) {
                     errorMsg->printf("YUV420 async call failed. Allowed for now.");
                     return skiagm::DrawResult::kSkip;
                 }
                 int nextCS = static_cast<int>(yuvColorSpace + 1) % (kLastEnum_SkYUVColorSpace + 1);
                 yuvColorSpace = static_cast<SkYUVColorSpace>(nextCS);
             } else {
                 result = do_read_and_scale(surface, srcRect, ii, gamma, quality);
                 if (!result) {
                     errorMsg->printf("async read call failed.");
                     return skiagm::DrawResult::kFail;
                 }
             }
             canvas->drawImage(result, 0, 0);
             canvas->translate(newW + pad, 0);
         }
         canvas->restore();
         canvas->translate(0, newH + pad);
     }
     canvas->restore();
     return skiagm::DrawResult::kOk;
 }

 static skiagm::DrawResult do_rescale_image_grid(SkCanvas* canvas, const char* imageFile,
                                                 const SkIRect& srcRect, int newW, int newH,
                                                 bool doYUV420, SkString* errorMsg) {
     auto image = GetResourceAsImage(imageFile);
     if (!image) {
         errorMsg->printf("Could not load image file %s.", imageFile);
         return skiagm::DrawResult::kFail;
     }
     if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
         *errorMsg = "Not supported on recording/vector backends.";
         return skiagm::DrawResult::kSkip;
     }
     // Turn the image into a surface in order to call the read and rescale API
     auto surfInfo = image->imageInfo().makeWH(image->width(), image->height());
     auto surface = canvas->makeSurface(surfInfo);
     if (!surface && surfInfo.colorType() == kBGRA_8888_SkColorType) {
         surfInfo = surfInfo.makeColorType(kRGBA_8888_SkColorType);
         surface = canvas->makeSurface(surfInfo);
     }
     if (!surface) {
         *errorMsg = "Could not create surface for image.";
         // When testing abandoned GrContext we expect surface creation to fail.
         if (canvas->getGrContext() && canvas->getGrContext()->abandoned()) {
             return skiagm::DrawResult::kSkip;
         }
         return skiagm::DrawResult::kFail;
     }
     SkPaint paint;
     paint.setBlendMode(SkBlendMode::kSrc);
     surface->getCanvas()->drawImage(image, 0, 0, &paint);
     return do_rescale_grid(canvas, surface.get(), srcRect, newW, newH, doYUV420, errorMsg);
 }

 #define DEF_RESCALE_AND_READ_GM(IMAGE_FILE, TAG, SRC_RECT, W, H)                            \
     DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_##TAG, canvas, errorMsg, 3 * W, 2 * H) {  \
         ToolUtils::draw_checkerboard(canvas, SK_ColorDKGRAY, SK_ColorLTGRAY, 25);           \
         return do_rescale_image_grid(canvas, #IMAGE_FILE, SRC_RECT, W, H, false, errorMsg); \
     }

 #define DEF_RESCALE_AND_READ_YUV_GM(IMAGE_FILE, TAG, SRC_RECT, W, H)                               \
     DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_yuv420_##TAG, canvas, errorMsg, 3 * W, 2 * H) { \
         ToolUtils::draw_checkerboard(canvas, SK_ColorDKGRAY, SK_ColorLTGRAY, 25);                  \
         return do_rescale_image_grid(canvas, #IMAGE_FILE, SRC_RECT, W, H, true, errorMsg);         \
     }

 DEF_RESCALE_AND_READ_YUV_GM(images/yellow_rose.webp, rose, SkIRect::MakeXYWH(50, 5, 200, 150),
                             410, 376)

 DEF_RESCALE_AND_READ_GM(images/yellow_rose.webp, rose, SkIRect::MakeXYWH(100, 20, 100, 100),
                         410, 410)

 DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_down, SkIRect::MakeXYWH(0, 10, 180, 150), 45, 45)
 DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_up, SkIRect::MakeWH(180, 180), 800, 400)

 DEF_RESCALE_AND_READ_GM(images/text.png, text_down, SkIRect::MakeWH(637, 105), (int)(0.7 * 637),
                         (int)(0.7 * 105))
 DEF_RESCALE_AND_READ_GM(images/text.png, text_up, SkIRect::MakeWH(637, 105), (int)(1.2 * 637),
                         (int)(1.2 * 105))
 DEF_RESCALE_AND_READ_GM(images/text.png, text_up_large, SkIRect::MakeXYWH(300, 0, 300, 105),
                         (int)(2.4 * 300), (int)(2.4 * 105))

 DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_no_bleed, canvas, errorMsg, 60, 60) {
     if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
         *errorMsg = "Not supported on recording/vector backends.";
         return skiagm::DrawResult::kSkip;
     }

     static constexpr int kBorder = 5;
     static constexpr int kInner = 5;
     const auto srcRect = SkIRect::MakeXYWH(kBorder, kBorder, kInner, kInner);
     auto surfaceII =
             SkImageInfo::Make(kInner + 2 * kBorder, kInner + 2 * kBorder, kRGBA_8888_SkColorType,
                               kPremul_SkAlphaType, SkColorSpace::MakeSRGB());
     auto surface = canvas->makeSurface(surfaceII);
     if (!surface) {
         *errorMsg = "Could not create surface for image.";
         // When testing abandoned GrContext we expect surface creation to fail.
         if (canvas->getGrContext() && canvas->getGrContext()->abandoned()) {
             return skiagm::DrawResult::kSkip;
         }
         return skiagm::DrawResult::kFail;
     }
     surface->getCanvas()->clear(SK_ColorRED);
     surface->getCanvas()->save();
     surface->getCanvas()->clipRect(SkRect::Make(srcRect), SkClipOp::kIntersect, false);
     surface->getCanvas()->clear(SK_ColorBLUE);
     surface->getCanvas()->restore();
     static constexpr int kPad = 2;
     canvas->translate(kPad, kPad);
     skiagm::DrawResult result;
     auto downW = static_cast<int>(kInner / 2);
     auto downH = static_cast<int>(kInner / 2);
     result = do_rescale_grid(canvas, surface.get(), srcRect, downW, downH, false, errorMsg, kPad);
     if (result != skiagm::DrawResult::kOk) {
         return result;
     }
     canvas->translate(0, 2 * downH);
     auto upW = static_cast<int>(kInner * 3.5);
     auto upH = static_cast<int>(kInner * 4.6);
     result = do_rescale_grid(canvas, surface.get(), srcRect, upW, upH, false, errorMsg, kPad);
     if (result != skiagm::DrawResult::kOk) {
         return result;
     }
     return skiagm::DrawResult::kOk;
 }
	/*
	* Copyright 2019 Google LLC
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "gm/gm.h"
	#include "include/core/SkCanvas.h"
	#include "include/core/SkColor.h"
	#include "include/core/SkPaint.h"
	#include "include/core/SkRect.h"
	#include "include/core/SkSurface.h"
	#include "include/core/SkYUVAIndex.h"
	#include "include/gpu/GrContext.h"
	#include "src/core/SkAutoPixmapStorage.h"
	#include "src/core/SkConvertPixels.h"
	#include "src/core/SkScopeExit.h"
	#include "src/gpu/GrContextPriv.h"
	#include "src/gpu/GrGpu.h"
	#include "tools/Resources.h"
	#include "tools/ToolUtils.h"

	// Draws the image to a surface, does a asyncRescaleAndReadPixels of the image, and then sticks
	// the result in a raster image.
	static sk_sp<SkImage> do_read_and_scale(SkSurface* surface, const SkIRect& srcRect,
	const SkImageInfo& ii, SkSurface::RescaleGamma rescaleGamma,
	SkFilterQuality quality) {
	SkBitmap bmp;
	bmp.allocPixels(ii);
	SkPaint paint;
	paint.setBlendMode(SkBlendMode::kSrc);
	struct Context {
	SkPixmap fPixmap;
	bool fCalled = false;
	bool fSucceeded = false;
	} context;
	SkAssertResult(bmp.peekPixels(&context.fPixmap));
	auto callback = [](void* c, const void* data, size_t rowBytes) {
	auto context = reinterpret_cast<Context*>(c);
	context->fCalled = true;
	if (!data) {
	context->fPixmap.reset();
	return;
	}
	context->fSucceeded = true;
	SkRectMemcpy(context->fPixmap.writable_addr(), context->fPixmap.rowBytes(), data, rowBytes,
	context->fPixmap.info().minRowBytes(), context->fPixmap.height());
	};
	surface->asyncRescaleAndReadPixels(ii, srcRect, rescaleGamma, quality, callback, &context);
	while (!context.fCalled) {
	// Only GPU should actually be asynchronous.
	SkASSERT(surface->getCanvas()->getGrContext());
	surface->getCanvas()->getGrContext()->checkAsyncWorkCompletion();
	}
	return context.fSucceeded ? SkImage::MakeFromBitmap(bmp) : nullptr;
	}

	static sk_sp<SkImage> do_read_and_scale_yuv(SkSurface* surface, SkYUVColorSpace yuvCS,
	const SkIRect& srcRect, int dstW, int dstH,
	SkSurface::RescaleGamma rescaleGamma,
	SkFilterQuality quality, SkScopeExit* cleanup) {
	SkASSERT(!(dstW & 0b1) && !(dstH & 0b1));
	std::unique_ptr<uint8_t[]> yData(new uint8_t[dstW * dstH]);
	std::unique_ptr<uint8_t[]> uData(new uint8_t[dstW / 2 * dstH / 2]);
	std::unique_ptr<uint8_t[]> vData(new uint8_t[dstW / 2 * dstH / 2]);
	struct Context {
	int fW;
	int fH;
	uint8_t* fYData;
	uint8_t* fUData;
	uint8_t* fVData;
	bool fCalled = false;
	bool fSucceeded = false;
	} context{dstW, dstH, yData.get(), uData.get(), vData.get()};
	auto callback = [](void* c, const void* data[2], size_t rowBytes[2]) {
	auto context = reinterpret_cast<Context*>(c);
	context->fCalled = true;
	if (!data) {
	return;
	}
	context->fSucceeded = true;
	int w = context->fW;
	int h = context->fH;
	SkRectMemcpy(context->fYData, w, data[0], rowBytes[0], w, h);
	SkRectMemcpy(context->fUData, w / 2, data[1], rowBytes[1], w / 2, h / 2);
	SkRectMemcpy(context->fVData, w / 2, data[2], rowBytes[2], w / 2, h / 2);
	};
	surface->asyncRescaleAndReadPixelsYUV420(yuvCS, SkColorSpace::MakeSRGB(), srcRect, dstW, dstH,
	rescaleGamma, quality, callback, &context);
	while (!context.fCalled) {
	// Only GPU should actually be asynchronous.
	SkASSERT(surface->getCanvas()->getGrContext());
	surface->getCanvas()->getGrContext()->checkAsyncWorkCompletion();
	}
	if (!context.fSucceeded) {
	return nullptr;
	}
	auto* gr = surface->getCanvas()->getGrContext();
	GrBackendTexture backendTextures[3];
	GrBackendFormat format = gr->priv().caps()->getBackendFormatFromColorType(kAlpha_8_SkColorType);
	backendTextures[0] = gr->priv().getGpu()->createBackendTexture(
	dstW, dstH, format, GrMipMapped::kNo, GrRenderable::kNo, yData.get(), 0, nullptr,
	GrProtected::kNo);
	backendTextures[1] = gr->priv().getGpu()->createBackendTexture(
	dstW / 2, dstH / 2, format, GrMipMapped::kNo, GrRenderable::kNo,
	uData.get(), 0, nullptr, GrProtected::kNo);
	backendTextures[2] = gr->priv().getGpu()->createBackendTexture(
	dstW / 2, dstH / 2, format, GrMipMapped::kNo, GrRenderable::kNo,
	vData.get(), 0, nullptr, GrProtected::kNo);
	auto config = gr->priv().caps()->getConfigFromBackendFormat(format, kAlpha_8_SkColorType);
	SkColorChannel channel;
	if (config == kAlpha_8_as_Red_GrPixelConfig) {
	channel = SkColorChannel::kR;
	} else {
	SkASSERT(config == kAlpha_8_as_Alpha_GrPixelConfig);
	channel = SkColorChannel::kA;
	}
	SkYUVAIndex indices[4]{{0, channel}, {1, channel}, {2, channel}, {-1, SkColorChannel::kR}};
	*cleanup = {[gr, backendTextures] {
	GrFlushInfo flushInfo;
	flushInfo.fFlags = kSyncCpu_GrFlushFlag;
	gr->flush(flushInfo);
	gr->deleteBackendTexture(backendTextures[0]);
	gr->deleteBackendTexture(backendTextures[1]);
	gr->deleteBackendTexture(backendTextures[2]);
	}};

	return SkImage::MakeFromYUVATextures(gr, yuvCS, backendTextures, indices, {dstW, dstH},
	kTopLeft_GrSurfaceOrigin, SkColorSpace::MakeSRGB());
	}

	// Draws a grid of rescales. The columns are none, low, and high filter quality. The rows are
	// rescale in src gamma and rescale in linear gamma.
	static skiagm::DrawResult do_rescale_grid(SkCanvas* canvas, SkSurface* surface,
	const SkIRect& srcRect, int newW, int newH, bool doYUV420,
	SkString* errorMsg, int pad = 0) {
	if (doYUV420) {
	if (!canvas->getGrContext() \|\| !canvas->getGrContext()->priv().asDirectContext()) {
	errorMsg->printf("YUV420 only supported on direct GPU for now.");
	return skiagm::DrawResult::kSkip;
	}
	}
	if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
	*errorMsg = "Not supported on recording/vector backends.";
	return skiagm::DrawResult::kSkip;
	}
	const auto ii = canvas->imageInfo().makeWH(newW, newH);

	SkYUVColorSpace yuvColorSpace = kRec601_SkYUVColorSpace;
	canvas->save();
	for (auto gamma : {SkSurface::RescaleGamma::kSrc, SkSurface::RescaleGamma::kLinear}) {
	canvas->save();
	for (auto quality : {kNone_SkFilterQuality, kLow_SkFilterQuality, kHigh_SkFilterQuality}) {
	SkScopeExit cleanup;
	sk_sp<SkImage> result;
	if (doYUV420) {
	result = do_read_and_scale_yuv(surface, yuvColorSpace, srcRect, newW, newH, gamma,
	quality, &cleanup);
	if (!result) {
	errorMsg->printf("YUV420 async call failed. Allowed for now.");
	return skiagm::DrawResult::kSkip;
	}
	int nextCS = static_cast<int>(yuvColorSpace + 1) % (kLastEnum_SkYUVColorSpace + 1);
	yuvColorSpace = static_cast<SkYUVColorSpace>(nextCS);
	} else {
	result = do_read_and_scale(surface, srcRect, ii, gamma, quality);
	if (!result) {
	errorMsg->printf("async read call failed.");
	return skiagm::DrawResult::kFail;
	}
	}
	canvas->drawImage(result, 0, 0);
	canvas->translate(newW + pad, 0);
	}
	canvas->restore();
	canvas->translate(0, newH + pad);
	}
	canvas->restore();
	return skiagm::DrawResult::kOk;
	}

	static skiagm::DrawResult do_rescale_image_grid(SkCanvas* canvas, const char* imageFile,
	const SkIRect& srcRect, int newW, int newH,
	bool doYUV420, SkString* errorMsg) {
	auto image = GetResourceAsImage(imageFile);
	if (!image) {
	errorMsg->printf("Could not load image file %s.", imageFile);
	return skiagm::DrawResult::kFail;
	}
	if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
	*errorMsg = "Not supported on recording/vector backends.";
	return skiagm::DrawResult::kSkip;
	}
	// Turn the image into a surface in order to call the read and rescale API
	auto surfInfo = image->imageInfo().makeWH(image->width(), image->height());
	auto surface = canvas->makeSurface(surfInfo);
	if (!surface && surfInfo.colorType() == kBGRA_8888_SkColorType) {
	surfInfo = surfInfo.makeColorType(kRGBA_8888_SkColorType);
	surface = canvas->makeSurface(surfInfo);
	}
	if (!surface) {
	*errorMsg = "Could not create surface for image.";
	// When testing abandoned GrContext we expect surface creation to fail.
	if (canvas->getGrContext() && canvas->getGrContext()->abandoned()) {
	return skiagm::DrawResult::kSkip;
	}
	return skiagm::DrawResult::kFail;
	}
	SkPaint paint;
	paint.setBlendMode(SkBlendMode::kSrc);
	surface->getCanvas()->drawImage(image, 0, 0, &paint);
	return do_rescale_grid(canvas, surface.get(), srcRect, newW, newH, doYUV420, errorMsg);
	}

	#define DEF_RESCALE_AND_READ_GM(IMAGE_FILE, TAG, SRC_RECT, W, H) \
	DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_##TAG, canvas, errorMsg, 3 * W, 2 * H) { \
	ToolUtils::draw_checkerboard(canvas, SK_ColorDKGRAY, SK_ColorLTGRAY, 25); \
	return do_rescale_image_grid(canvas, #IMAGE_FILE, SRC_RECT, W, H, false, errorMsg); \
	}

	#define DEF_RESCALE_AND_READ_YUV_GM(IMAGE_FILE, TAG, SRC_RECT, W, H) \
	DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_yuv420_##TAG, canvas, errorMsg, 3 * W, 2 * H) { \
	ToolUtils::draw_checkerboard(canvas, SK_ColorDKGRAY, SK_ColorLTGRAY, 25); \
	return do_rescale_image_grid(canvas, #IMAGE_FILE, SRC_RECT, W, H, true, errorMsg); \
	}

	DEF_RESCALE_AND_READ_YUV_GM(images/yellow_rose.webp, rose, SkIRect::MakeXYWH(50, 5, 200, 150),
	410, 376)

	DEF_RESCALE_AND_READ_GM(images/yellow_rose.webp, rose, SkIRect::MakeXYWH(100, 20, 100, 100),
	410, 410)

	DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_down, SkIRect::MakeXYWH(0, 10, 180, 150), 45, 45)
	DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_up, SkIRect::MakeWH(180, 180), 800, 400)

	DEF_RESCALE_AND_READ_GM(images/text.png, text_down, SkIRect::MakeWH(637, 105), (int)(0.7 * 637),
	(int)(0.7 * 105))
	DEF_RESCALE_AND_READ_GM(images/text.png, text_up, SkIRect::MakeWH(637, 105), (int)(1.2 * 637),
	(int)(1.2 * 105))
	DEF_RESCALE_AND_READ_GM(images/text.png, text_up_large, SkIRect::MakeXYWH(300, 0, 300, 105),
	(int)(2.4 * 300), (int)(2.4 * 105))

	DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_no_bleed, canvas, errorMsg, 60, 60) {
	if (canvas->imageInfo().colorType() == kUnknown_SkColorType) {
	*errorMsg = "Not supported on recording/vector backends.";
	return skiagm::DrawResult::kSkip;
	}

	static constexpr int kBorder = 5;
	static constexpr int kInner = 5;
	const auto srcRect = SkIRect::MakeXYWH(kBorder, kBorder, kInner, kInner);
	auto surfaceII =
	SkImageInfo::Make(kInner + 2 * kBorder, kInner + 2 * kBorder, kRGBA_8888_SkColorType,
	kPremul_SkAlphaType, SkColorSpace::MakeSRGB());
	auto surface = canvas->makeSurface(surfaceII);
	if (!surface) {
	*errorMsg = "Could not create surface for image.";
	// When testing abandoned GrContext we expect surface creation to fail.
	if (canvas->getGrContext() && canvas->getGrContext()->abandoned()) {
	return skiagm::DrawResult::kSkip;
	}
	return skiagm::DrawResult::kFail;
	}
	surface->getCanvas()->clear(SK_ColorRED);
	surface->getCanvas()->save();
	surface->getCanvas()->clipRect(SkRect::Make(srcRect), SkClipOp::kIntersect, false);
	surface->getCanvas()->clear(SK_ColorBLUE);
	surface->getCanvas()->restore();
	static constexpr int kPad = 2;
	canvas->translate(kPad, kPad);
	skiagm::DrawResult result;
	auto downW = static_cast<int>(kInner / 2);
	auto downH = static_cast<int>(kInner / 2);
	result = do_rescale_grid(canvas, surface.get(), srcRect, downW, downH, false, errorMsg, kPad);
	if (result != skiagm::DrawResult::kOk) {
	return result;
	}
	canvas->translate(0, 2 * downH);
	auto upW = static_cast<int>(kInner * 3.5);
	auto upH = static_cast<int>(kInner * 4.6);
	result = do_rescale_grid(canvas, surface.get(), srcRect, upW, upH, false, errorMsg, kPad);
	if (result != skiagm::DrawResult::kOk) {
	return result;
	}
	return skiagm::DrawResult::kOk;
	}