tests/SpecialImageTest.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file
  */

 #include "include/core/SkBitmap.h"
 #include "include/core/SkCanvas.h"
 #include "include/core/SkImage.h"
 #include "include/core/SkPixmap.h"
 #include "include/core/SkSurface.h"
 #include "src/core/SkAutoPixmapStorage.h"
 #include "src/core/SkSpecialImage.h"
 #include "src/core/SkSpecialSurface.h"
 #include "tests/Test.h"

 #include "include/gpu/GrBackendSurface.h"
 #include "include/gpu/GrContext.h"
 #include "src/gpu/GrBitmapTextureMaker.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrProxyProvider.h"
 #include "src/gpu/GrSurfaceProxy.h"
 #include "src/gpu/GrTextureProxy.h"
 #include "src/gpu/SkGr.h"


 // This test creates backing resources exactly sized to [kFullSize x kFullSize].
 // It then wraps them in an SkSpecialImage with only the center (red) region being active.
 // It then draws the SkSpecialImage to a full sized (all blue) canvas and checks that none
 // of the inactive (green) region leaked out.

 static const int kSmallerSize = 10;
 static const int kPad = 3;
 static const int kFullSize = kSmallerSize + 2 * kPad;

 // Create a bitmap with red in the center and green around it
 static SkBitmap create_bm() {
     SkImageInfo ii = SkImageInfo::Make(kFullSize, kFullSize, kRGBA_8888_SkColorType,
                                        kPremul_SkAlphaType);

     SkBitmap bm;
     bm.allocPixels(ii);

     SkCanvas temp(bm);

     temp.clear(SK_ColorGREEN);
     SkPaint p;
     p.setColor(SK_ColorRED);
     p.setAntiAlias(false);

     temp.drawRect(SkRect::MakeXYWH(SkIntToScalar(kPad), SkIntToScalar(kPad),
                                    SkIntToScalar(kSmallerSize), SkIntToScalar(kSmallerSize)),
                   p);

     bm.setImmutable();
     return bm;
 }

 // Basic test of the SkSpecialImage public API (e.g., peekTexture, peekPixels & draw)
 static void test_image(const sk_sp<SkSpecialImage>& img, skiatest::Reporter* reporter,
                        GrContext* context, bool isGPUBacked) {
     const SkIRect subset = img->subset();
     REPORTER_ASSERT(reporter, kPad == subset.left());
     REPORTER_ASSERT(reporter, kPad == subset.top());
     REPORTER_ASSERT(reporter, kSmallerSize == subset.width());
     REPORTER_ASSERT(reporter, kSmallerSize == subset.height());

     //--------------
     // Test that isTextureBacked reports the correct backing type
     REPORTER_ASSERT(reporter, isGPUBacked == img->isTextureBacked());

     //--------------
     // Test view - as long as there is a context this should succeed
     if (context) {
         GrSurfaceProxyView view = img->view(context);
         REPORTER_ASSERT(reporter, view.asTextureProxy());
     }

     //--------------
     // Test getROPixels - this should always succeed regardless of backing store
     SkBitmap bitmap;
     REPORTER_ASSERT(reporter, img->getROPixels(&bitmap));
     REPORTER_ASSERT(reporter, kSmallerSize == bitmap.width());
     REPORTER_ASSERT(reporter, kSmallerSize == bitmap.height());

     //--------------
     // Test that draw restricts itself to the subset
     sk_sp<SkSpecialSurface> surf(img->makeSurface(kN32_SkColorType, img->getColorSpace(),
                                                   SkISize::Make(kFullSize, kFullSize),
                                                   kPremul_SkAlphaType));

     SkCanvas* canvas = surf->getCanvas();

     canvas->clear(SK_ColorBLUE);
     img->draw(canvas, SkIntToScalar(kPad), SkIntToScalar(kPad), nullptr);

     SkBitmap bm;
     bm.allocN32Pixels(kFullSize, kFullSize, false);

     bool result = canvas->readPixels(bm.info(), bm.getPixels(), bm.rowBytes(), 0, 0);
     SkASSERT_RELEASE(result);

     // Only the center (red) portion should've been drawn into the canvas
     REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kPad-1, kPad-1));
     REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kPad, kPad));
     REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kSmallerSize+kPad-1,
                                                           kSmallerSize+kPad-1));
     REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kSmallerSize+kPad,
                                                           kSmallerSize+kPad));

     //--------------
     // Test that asImage & makeTightSurface return appropriately sized objects
     // of the correct backing type
     SkIRect newSubset = SkIRect::MakeWH(subset.width(), subset.height());
     {
         sk_sp<SkImage> tightImg(img->asImage(&newSubset));

         REPORTER_ASSERT(reporter, tightImg->width() == subset.width());
         REPORTER_ASSERT(reporter, tightImg->height() == subset.height());
         REPORTER_ASSERT(reporter, isGPUBacked == tightImg->isTextureBacked());
         SkPixmap tmpPixmap;
         REPORTER_ASSERT(reporter, isGPUBacked != !!tightImg->peekPixels(&tmpPixmap));
     }
     {
         sk_sp<SkSurface> tightSurf(img->makeTightSurface(kN32_SkColorType, img->getColorSpace(),
                                                          subset.size()));

         REPORTER_ASSERT(reporter, tightSurf->width() == subset.width());
         REPORTER_ASSERT(reporter, tightSurf->height() == subset.height());
         GrBackendTexture backendTex = tightSurf->getBackendTexture(
                                                     SkSurface::kDiscardWrite_BackendHandleAccess);
         REPORTER_ASSERT(reporter, isGPUBacked == backendTex.isValid());
         SkPixmap tmpPixmap;
         REPORTER_ASSERT(reporter, isGPUBacked != !!tightSurf->peekPixels(&tmpPixmap));
     }
 }

 DEF_TEST(SpecialImage_Raster, reporter) {
     SkBitmap bm = create_bm();

     sk_sp<SkSpecialImage> fullSImage(SkSpecialImage::MakeFromRaster(
                                                             SkIRect::MakeWH(kFullSize, kFullSize),
                                                             bm));

     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

     {
         sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeFromRaster(subset, bm));
         test_image(subSImg1, reporter, nullptr, false);
     }

     {
         sk_sp<SkSpecialImage> subSImg2(fullSImage->makeSubset(subset));
         test_image(subSImg2, reporter, nullptr, false);
     }
 }

 static void test_specialimage_image(skiatest::Reporter* reporter) {
     SkBitmap bm = create_bm();

     sk_sp<SkImage> fullImage(SkImage::MakeFromBitmap(bm));

     sk_sp<SkSpecialImage> fullSImage(SkSpecialImage::MakeFromImage(
                                                             nullptr,
                                                             SkIRect::MakeWH(kFullSize, kFullSize),
                                                             fullImage));

     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

     {
         sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeFromImage(nullptr, subset, fullImage));
         test_image(subSImg1, reporter, nullptr, false);
     }

     {
         sk_sp<SkSpecialImage> subSImg2(fullSImage->makeSubset(subset));
         test_image(subSImg2, reporter, nullptr, false);
     }
 }

 DEF_TEST(SpecialImage_Image_Legacy, reporter) {
     test_specialimage_image(reporter);
 }

 static void test_texture_backed(skiatest::Reporter* reporter,
                                 const sk_sp<SkSpecialImage>& orig,
                                 const sk_sp<SkSpecialImage>& gpuBacked) {
     REPORTER_ASSERT(reporter, gpuBacked);
     REPORTER_ASSERT(reporter, gpuBacked->isTextureBacked());
     REPORTER_ASSERT(reporter, gpuBacked->uniqueID() == orig->uniqueID());
     REPORTER_ASSERT(reporter, gpuBacked->subset().width() == orig->subset().width() &&
                               gpuBacked->subset().height() == orig->subset().height());
     REPORTER_ASSERT(reporter, gpuBacked->getColorSpace() == orig->getColorSpace());
 }

 // Test out the SkSpecialImage::makeTextureImage entry point
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, ctxInfo) {
     GrContext* context = ctxInfo.grContext();
     SkBitmap bm = create_bm();

     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

     {
         // raster
         sk_sp<SkSpecialImage> rasterImage(SkSpecialImage::MakeFromRaster(
                                                                         SkIRect::MakeWH(kFullSize,
                                                                                         kFullSize),
                                                                         bm));

         {
             sk_sp<SkSpecialImage> fromRaster(rasterImage->makeTextureImage(context));
             test_texture_backed(reporter, rasterImage, fromRaster);
         }

         {
             sk_sp<SkSpecialImage> subRasterImage(rasterImage->makeSubset(subset));

             sk_sp<SkSpecialImage> fromSubRaster(subRasterImage->makeTextureImage(context));
             test_texture_backed(reporter, subRasterImage, fromSubRaster);
         }
     }

     {
         // gpu
         GrBitmapTextureMaker maker(context, bm);
         auto[view, grCT] = maker.view(GrMipMapped::kNo);
         if (!view.proxy()) {
             return;
         }

         sk_sp<SkSpecialImage> gpuImage(SkSpecialImage::MakeDeferredFromGpu(
                                                             context,
                                                             SkIRect::MakeWH(kFullSize, kFullSize),
                                                             kNeedNewImageUniqueID_SpecialImage,
                                                             std::move(view),
                                                             grCT,
                                                             nullptr));

         {
             sk_sp<SkSpecialImage> fromGPU(gpuImage->makeTextureImage(context));
             test_texture_backed(reporter, gpuImage, fromGPU);
         }

         {
             sk_sp<SkSpecialImage> subGPUImage(gpuImage->makeSubset(subset));

             sk_sp<SkSpecialImage> fromSubGPU(subGPUImage->makeTextureImage(context));
             test_texture_backed(reporter, subGPUImage, fromSubGPU);
         }
     }
 }

 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
     GrContext* context = ctxInfo.grContext();
     SkBitmap bm = create_bm();
     GrBitmapTextureMaker maker(context, bm);
     auto[view, grCT] = maker.view(GrMipMapped::kNo);
     if (!view.proxy()) {
         return;
     }

     sk_sp<SkSpecialImage> fullSImg(SkSpecialImage::MakeDeferredFromGpu(
                                                             context,
                                                             SkIRect::MakeWH(kFullSize, kFullSize),
                                                             kNeedNewImageUniqueID_SpecialImage,
                                                             view,
                                                             grCT,
                                                             nullptr));

     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

     {
         sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeDeferredFromGpu(
                                                                context, subset,
                                                                kNeedNewImageUniqueID_SpecialImage,
                                                                std::move(view),
                                                                grCT,
                                                                nullptr));
         test_image(subSImg1, reporter, context, true);
     }

     {
         sk_sp<SkSpecialImage> subSImg2(fullSImg->makeSubset(subset));
         test_image(subSImg2, reporter, context, true);
     }
 }

 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_ReadbackAndCachingSubsets_Gpu, reporter, ctxInfo) {
     GrContext* context = ctxInfo.grContext();
     SkImageInfo ii = SkImageInfo::Make(50, 50, kN32_SkColorType, kPremul_SkAlphaType);
     auto surface = SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii);

     // Fill out our surface:
     // Green | Blue
     //  Red  | Green
     {
         surface->getCanvas()->clear(SK_ColorGREEN);
         SkPaint p;
         p.setColor(SK_ColorRED);
         surface->getCanvas()->drawRect(SkRect::MakeXYWH(0, 25, 25, 25), p);
         p.setColor(SK_ColorBLUE);
         surface->getCanvas()->drawRect(SkRect::MakeXYWH(25, 0, 25, 25), p);
     }

     auto image = surface->makeImageSnapshot();
     auto redImg  = SkSpecialImage::MakeFromImage(context, SkIRect::MakeXYWH(10, 30, 10, 10), image);
     auto blueImg = SkSpecialImage::MakeFromImage(context, SkIRect::MakeXYWH(30, 10, 10, 10), image);

     // This isn't necessary, but if it ever becomes false, then the cache collision bug that we're
     // checking below is irrelevant.
     REPORTER_ASSERT(reporter, redImg->uniqueID() == blueImg->uniqueID());

     SkBitmap redBM, blueBM;
     SkAssertResult(redImg->getROPixels(&redBM));
     SkAssertResult(blueImg->getROPixels(&blueBM));

     // Each image should read from the correct sub-rect. Past bugs (skbug.com/8448) have included:
     // - Always reading back from (0, 0), producing green
     // - Incorrectly hitting the cache on the 2nd read-back, causing blueBM to be red
     REPORTER_ASSERT(reporter, redBM.getColor(0, 0) == SK_ColorRED,
                     "0x%08x != 0x%08x", redBM.getColor(0, 0), SK_ColorRED);
     REPORTER_ASSERT(reporter, blueBM.getColor(0, 0) == SK_ColorBLUE,
                     "0x%08x != 0x%08x", blueBM.getColor(0, 0), SK_ColorBLUE);
 }
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file
	*/

	#include "include/core/SkBitmap.h"
	#include "include/core/SkCanvas.h"
	#include "include/core/SkImage.h"
	#include "include/core/SkPixmap.h"
	#include "include/core/SkSurface.h"
	#include "src/core/SkAutoPixmapStorage.h"
	#include "src/core/SkSpecialImage.h"
	#include "src/core/SkSpecialSurface.h"
	#include "tests/Test.h"

	#include "include/gpu/GrBackendSurface.h"
	#include "include/gpu/GrContext.h"
	#include "src/gpu/GrBitmapTextureMaker.h"
	#include "src/gpu/GrContextPriv.h"
	#include "src/gpu/GrProxyProvider.h"
	#include "src/gpu/GrSurfaceProxy.h"
	#include "src/gpu/GrTextureProxy.h"
	#include "src/gpu/SkGr.h"


	// This test creates backing resources exactly sized to [kFullSize x kFullSize].
	// It then wraps them in an SkSpecialImage with only the center (red) region being active.
	// It then draws the SkSpecialImage to a full sized (all blue) canvas and checks that none
	// of the inactive (green) region leaked out.

	static const int kSmallerSize = 10;
	static const int kPad = 3;
	static const int kFullSize = kSmallerSize + 2 * kPad;

	// Create a bitmap with red in the center and green around it
	static SkBitmap create_bm() {
	SkImageInfo ii = SkImageInfo::Make(kFullSize, kFullSize, kRGBA_8888_SkColorType,
	kPremul_SkAlphaType);

	SkBitmap bm;
	bm.allocPixels(ii);

	SkCanvas temp(bm);

	temp.clear(SK_ColorGREEN);
	SkPaint p;
	p.setColor(SK_ColorRED);
	p.setAntiAlias(false);

	temp.drawRect(SkRect::MakeXYWH(SkIntToScalar(kPad), SkIntToScalar(kPad),
	SkIntToScalar(kSmallerSize), SkIntToScalar(kSmallerSize)),
	p);

	bm.setImmutable();
	return bm;
	}

	// Basic test of the SkSpecialImage public API (e.g., peekTexture, peekPixels & draw)
	static void test_image(const sk_sp<SkSpecialImage>& img, skiatest::Reporter* reporter,
	GrContext* context, bool isGPUBacked) {
	const SkIRect subset = img->subset();
	REPORTER_ASSERT(reporter, kPad == subset.left());
	REPORTER_ASSERT(reporter, kPad == subset.top());
	REPORTER_ASSERT(reporter, kSmallerSize == subset.width());
	REPORTER_ASSERT(reporter, kSmallerSize == subset.height());

	//--------------
	// Test that isTextureBacked reports the correct backing type
	REPORTER_ASSERT(reporter, isGPUBacked == img->isTextureBacked());

	//--------------
	// Test view - as long as there is a context this should succeed
	if (context) {
	GrSurfaceProxyView view = img->view(context);
	REPORTER_ASSERT(reporter, view.asTextureProxy());
	}

	//--------------
	// Test getROPixels - this should always succeed regardless of backing store
	SkBitmap bitmap;
	REPORTER_ASSERT(reporter, img->getROPixels(&bitmap));
	REPORTER_ASSERT(reporter, kSmallerSize == bitmap.width());
	REPORTER_ASSERT(reporter, kSmallerSize == bitmap.height());

	//--------------
	// Test that draw restricts itself to the subset
	sk_sp<SkSpecialSurface> surf(img->makeSurface(kN32_SkColorType, img->getColorSpace(),
	SkISize::Make(kFullSize, kFullSize),
	kPremul_SkAlphaType));

	SkCanvas* canvas = surf->getCanvas();

	canvas->clear(SK_ColorBLUE);
	img->draw(canvas, SkIntToScalar(kPad), SkIntToScalar(kPad), nullptr);

	SkBitmap bm;
	bm.allocN32Pixels(kFullSize, kFullSize, false);

	bool result = canvas->readPixels(bm.info(), bm.getPixels(), bm.rowBytes(), 0, 0);
	SkASSERT_RELEASE(result);

	// Only the center (red) portion should've been drawn into the canvas
	REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kPad-1, kPad-1));
	REPORTER_ASSERT(reporter, SK_ColorRED == bm.getColor(kPad, kPad));
	REPORTER_ASSERT(reporter, SK_ColorRED == bm.getColor(kSmallerSize+kPad-1,
	kSmallerSize+kPad-1));
	REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kSmallerSize+kPad,
	kSmallerSize+kPad));

	//--------------
	// Test that asImage & makeTightSurface return appropriately sized objects
	// of the correct backing type
	SkIRect newSubset = SkIRect::MakeWH(subset.width(), subset.height());
	{
	sk_sp<SkImage> tightImg(img->asImage(&newSubset));

	REPORTER_ASSERT(reporter, tightImg->width() == subset.width());
	REPORTER_ASSERT(reporter, tightImg->height() == subset.height());
	REPORTER_ASSERT(reporter, isGPUBacked == tightImg->isTextureBacked());
	SkPixmap tmpPixmap;
	REPORTER_ASSERT(reporter, isGPUBacked != !!tightImg->peekPixels(&tmpPixmap));
	}
	{
	sk_sp<SkSurface> tightSurf(img->makeTightSurface(kN32_SkColorType, img->getColorSpace(),
	subset.size()));

	REPORTER_ASSERT(reporter, tightSurf->width() == subset.width());
	REPORTER_ASSERT(reporter, tightSurf->height() == subset.height());
	GrBackendTexture backendTex = tightSurf->getBackendTexture(
	SkSurface::kDiscardWrite_BackendHandleAccess);
	REPORTER_ASSERT(reporter, isGPUBacked == backendTex.isValid());
	SkPixmap tmpPixmap;
	REPORTER_ASSERT(reporter, isGPUBacked != !!tightSurf->peekPixels(&tmpPixmap));
	}
	}

	DEF_TEST(SpecialImage_Raster, reporter) {
	SkBitmap bm = create_bm();

	sk_sp<SkSpecialImage> fullSImage(SkSpecialImage::MakeFromRaster(
	SkIRect::MakeWH(kFullSize, kFullSize),
	bm));

	const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

	{
	sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeFromRaster(subset, bm));
	test_image(subSImg1, reporter, nullptr, false);
	}

	{
	sk_sp<SkSpecialImage> subSImg2(fullSImage->makeSubset(subset));
	test_image(subSImg2, reporter, nullptr, false);
	}
	}

	static void test_specialimage_image(skiatest::Reporter* reporter) {
	SkBitmap bm = create_bm();

	sk_sp<SkImage> fullImage(SkImage::MakeFromBitmap(bm));

	sk_sp<SkSpecialImage> fullSImage(SkSpecialImage::MakeFromImage(
	nullptr,
	SkIRect::MakeWH(kFullSize, kFullSize),
	fullImage));

	const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

	{
	sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeFromImage(nullptr, subset, fullImage));
	test_image(subSImg1, reporter, nullptr, false);
	}

	{
	sk_sp<SkSpecialImage> subSImg2(fullSImage->makeSubset(subset));
	test_image(subSImg2, reporter, nullptr, false);
	}
	}

	DEF_TEST(SpecialImage_Image_Legacy, reporter) {
	test_specialimage_image(reporter);
	}

	static void test_texture_backed(skiatest::Reporter* reporter,
	const sk_sp<SkSpecialImage>& orig,
	const sk_sp<SkSpecialImage>& gpuBacked) {
	REPORTER_ASSERT(reporter, gpuBacked);
	REPORTER_ASSERT(reporter, gpuBacked->isTextureBacked());
	REPORTER_ASSERT(reporter, gpuBacked->uniqueID() == orig->uniqueID());
	REPORTER_ASSERT(reporter, gpuBacked->subset().width() == orig->subset().width() &&
	gpuBacked->subset().height() == orig->subset().height());
	REPORTER_ASSERT(reporter, gpuBacked->getColorSpace() == orig->getColorSpace());
	}

	// Test out the SkSpecialImage::makeTextureImage entry point
	DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, ctxInfo) {
	GrContext* context = ctxInfo.grContext();
	SkBitmap bm = create_bm();

	const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

	{
	// raster
	sk_sp<SkSpecialImage> rasterImage(SkSpecialImage::MakeFromRaster(
	SkIRect::MakeWH(kFullSize,
	kFullSize),
	bm));

	{
	sk_sp<SkSpecialImage> fromRaster(rasterImage->makeTextureImage(context));
	test_texture_backed(reporter, rasterImage, fromRaster);
	}

	{
	sk_sp<SkSpecialImage> subRasterImage(rasterImage->makeSubset(subset));

	sk_sp<SkSpecialImage> fromSubRaster(subRasterImage->makeTextureImage(context));
	test_texture_backed(reporter, subRasterImage, fromSubRaster);
	}
	}

	{
	// gpu
	GrBitmapTextureMaker maker(context, bm);
	auto[view, grCT] = maker.view(GrMipMapped::kNo);
	if (!view.proxy()) {
	return;
	}

	sk_sp<SkSpecialImage> gpuImage(SkSpecialImage::MakeDeferredFromGpu(
	context,
	SkIRect::MakeWH(kFullSize, kFullSize),
	kNeedNewImageUniqueID_SpecialImage,
	std::move(view),
	grCT,
	nullptr));

	{
	sk_sp<SkSpecialImage> fromGPU(gpuImage->makeTextureImage(context));
	test_texture_backed(reporter, gpuImage, fromGPU);
	}

	{
	sk_sp<SkSpecialImage> subGPUImage(gpuImage->makeSubset(subset));

	sk_sp<SkSpecialImage> fromSubGPU(subGPUImage->makeTextureImage(context));
	test_texture_backed(reporter, subGPUImage, fromSubGPU);
	}
	}
	}

	DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
	GrContext* context = ctxInfo.grContext();
	SkBitmap bm = create_bm();
	GrBitmapTextureMaker maker(context, bm);
	auto[view, grCT] = maker.view(GrMipMapped::kNo);
	if (!view.proxy()) {
	return;
	}

	sk_sp<SkSpecialImage> fullSImg(SkSpecialImage::MakeDeferredFromGpu(
	context,
	SkIRect::MakeWH(kFullSize, kFullSize),
	kNeedNewImageUniqueID_SpecialImage,
	view,
	grCT,
	nullptr));

	const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

	{
	sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeDeferredFromGpu(
	context, subset,
	kNeedNewImageUniqueID_SpecialImage,
	std::move(view),
	grCT,
	nullptr));
	test_image(subSImg1, reporter, context, true);
	}

	{
	sk_sp<SkSpecialImage> subSImg2(fullSImg->makeSubset(subset));
	test_image(subSImg2, reporter, context, true);
	}
	}

	DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_ReadbackAndCachingSubsets_Gpu, reporter, ctxInfo) {
	GrContext* context = ctxInfo.grContext();
	SkImageInfo ii = SkImageInfo::Make(50, 50, kN32_SkColorType, kPremul_SkAlphaType);
	auto surface = SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii);

	// Fill out our surface:
	// Green \| Blue
	// Red \| Green
	{
	surface->getCanvas()->clear(SK_ColorGREEN);
	SkPaint p;
	p.setColor(SK_ColorRED);
	surface->getCanvas()->drawRect(SkRect::MakeXYWH(0, 25, 25, 25), p);
	p.setColor(SK_ColorBLUE);
	surface->getCanvas()->drawRect(SkRect::MakeXYWH(25, 0, 25, 25), p);
	}

	auto image = surface->makeImageSnapshot();
	auto redImg = SkSpecialImage::MakeFromImage(context, SkIRect::MakeXYWH(10, 30, 10, 10), image);
	auto blueImg = SkSpecialImage::MakeFromImage(context, SkIRect::MakeXYWH(30, 10, 10, 10), image);

	// This isn't necessary, but if it ever becomes false, then the cache collision bug that we're
	// checking below is irrelevant.
	REPORTER_ASSERT(reporter, redImg->uniqueID() == blueImg->uniqueID());

	SkBitmap redBM, blueBM;
	SkAssertResult(redImg->getROPixels(&redBM));
	SkAssertResult(blueImg->getROPixels(&blueBM));

	// Each image should read from the correct sub-rect. Past bugs (skbug.com/8448) have included:
	// - Always reading back from (0, 0), producing green
	// - Incorrectly hitting the cache on the 2nd read-back, causing blueBM to be red
	REPORTER_ASSERT(reporter, redBM.getColor(0, 0) == SK_ColorRED,
	"0x%08x != 0x%08x", redBM.getColor(0, 0), SK_ColorRED);
	REPORTER_ASSERT(reporter, blueBM.getColor(0, 0) == SK_ColorBLUE,
	"0x%08x != 0x%08x", blueBM.getColor(0, 0), SK_ColorBLUE);
	}