C++ GrContext::caps方法代码示例

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    SkBitmap bm = create_bm();

    const GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bm.info(), *context->caps());

    sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
                                                             desc, SkBudgeted::kNo,
                                                             bm.getPixels(), bm.rowBytes()));
    if (!proxy) {
        return;
    }

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

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

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

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

    void onDraw(SkCanvas* canvas) override {
        GrRenderTargetContext* renderTargetContext =
            canvas->internal_private_accessTopLayerRenderTargetContext();
        if (!renderTargetContext) {
            skiagm::GM::DrawGpuOnlyMessage(canvas);
            return;
        }

        GrContext* context = canvas->getGrContext();
        if (!context) {
            return;
        }

        GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
        sk_sp<GrTextureProxy> proxy[3];

        for (int i = 0; i < 3; ++i) {
            int index = (0 == i) ? 0 : 1;
            GrSurfaceDesc desc;
            desc.fWidth = fBmp[index].width();
            desc.fHeight = fBmp[index].height();
            desc.fConfig = SkImageInfo2GrPixelConfig(fBmp[index].info(), *context->caps());
            SkASSERT(kUnknown_GrPixelConfig != desc.fConfig);

            proxy[i] = proxyProvider->createTextureProxy(
                    desc, SkBudgeted::kYes, fBmp[index].getPixels(), fBmp[index].rowBytes());
            if (!proxy[i]) {
                return;
            }
        }

        constexpr SkScalar kDrawPad = 10.f;
        constexpr SkScalar kTestPad = 10.f;
        constexpr SkScalar kColorSpaceOffset = 36.f;
        SkISize sizes[3] = {{YSIZE, YSIZE}, {USIZE, USIZE}, {VSIZE, VSIZE}};

        for (int space = kJPEG_SkYUVColorSpace; space <= kLastEnum_SkYUVColorSpace; ++space) {
            SkRect renderRect =
                SkRect::MakeWH(SkIntToScalar(fBmp[0].width()), SkIntToScalar(fBmp[0].height()));
            renderRect.outset(kDrawPad, kDrawPad);

            SkScalar y = kDrawPad + kTestPad + space * kColorSpaceOffset;
            SkScalar x = kDrawPad + kTestPad;

            GrPaint grPaint;
            grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
            auto fp = GrYUVtoRGBEffect::Make(proxy[0], proxy[1], proxy[2], sizes,
                                             static_cast<SkYUVColorSpace>(space), true);
            if (fp) {
                SkMatrix viewMatrix;
                viewMatrix.setTranslate(x, y);
                grPaint.addColorFragmentProcessor(std::move(fp));
                std::unique_ptr<GrDrawOp> op(GrRectOpFactory::MakeNonAAFill(
                                std::move(grPaint), viewMatrix, renderRect, GrAAType::kNone));
                renderTargetContext->priv().testingOnly_addDrawOp(std::move(op));
            }
        }
    }

// 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
        const GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bm.info(), *context->caps());

        sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
                                                                 desc, SkBudgeted::kNo,
                                                                 bm.getPixels(), bm.rowBytes()));
        if (!proxy) {
            return;
        }

        sk_sp<SkSpecialImage> gpuImage(SkSpecialImage::MakeDeferredFromGpu(
                                                            context,
                                                            SkIRect::MakeWH(kFullSize, kFullSize),
                                                            kNeedNewImageUniqueID_SpecialImage,
                                                            std::move(proxy), 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);
        }
    }
}

// This tests that GrTextureStripAtlas flushes pending IO on the texture it acquires.
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(GrTextureStripAtlasFlush, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrSurfaceDesc desc;
    desc.fWidth = 32;
    desc.fHeight = 32;
    desc.fConfig = kRGBA_8888_GrPixelConfig;
    GrTexture* texture = context->textureProvider()->createTexture(desc, SkBudgeted::kYes,
                                                                   nullptr, 0);

    GrSurfaceDesc targetDesc = desc;
    targetDesc.fFlags = kRenderTarget_GrSurfaceFlag;
    GrTexture* target = context->textureProvider()->createTexture(targetDesc, SkBudgeted::kYes,
                                                                  nullptr, 0);

    SkAutoTMalloc<uint32_t> pixels(desc.fWidth * desc.fHeight);
    memset(pixels.get(), 0xFF, sizeof(uint32_t) * desc.fWidth * desc.fHeight);
    texture->writePixels(0, 0, desc.fWidth, desc.fHeight, kRGBA_8888_GrPixelConfig, pixels.get());

    // Add a pending read to the texture, and then make it available for reuse.
    context->copySurface(target, texture);
    texture->unref();

    // Create an atlas with parameters that allow it to reuse the texture.
    GrTextureStripAtlas::Desc atlasDesc;
    atlasDesc.fContext = context;
    atlasDesc.fConfig = desc.fConfig;
    atlasDesc.fWidth = desc.fWidth;
    atlasDesc.fHeight = desc.fHeight;
    atlasDesc.fRowHeight = 1;
    GrTextureStripAtlas* atlas = GrTextureStripAtlas::GetAtlas(atlasDesc);

    // Write to the atlas' texture.
    SkImageInfo info = SkImageInfo::MakeN32(desc.fWidth, desc.fHeight, kPremul_SkAlphaType);
    size_t rowBytes = desc.fWidth * GrBytesPerPixel(desc.fConfig);
    SkBitmap bitmap;
    bitmap.allocPixels(info, rowBytes);
    memset(bitmap.getPixels(), 1, rowBytes * desc.fHeight);
    int row = atlas->lockRow(bitmap);
    if (!context->caps()->preferVRAMUseOverFlushes())
        REPORTER_ASSERT(reporter, texture == atlas->getTexture());

    // The atlas' use of its texture shouldn't change which pixels got copied to the target.
    SkAutoTMalloc<uint32_t> actualPixels(desc.fWidth * desc.fHeight);
    bool success = target->readPixels(0, 0, desc.fWidth, desc.fHeight, kRGBA_8888_GrPixelConfig,
                                      actualPixels.get());
    REPORTER_ASSERT(reporter, success);
    REPORTER_ASSERT(reporter,
                    !memcmp(pixels.get(), actualPixels.get(),
                            sizeof(uint32_t) * desc.fWidth * desc.fHeight));
    target->unref();
    atlas->unlockRow(row);
}

SkSurface* Request::createGPUSurface() {
    GrContext* context = fContextFactory->get(GrContextFactory::kNative_GLContextType,
                                              GrContextFactory::kNone_GLContextOptions);
    int maxRTSize = context->caps()->maxRenderTargetSize();
    SkImageInfo info = SkImageInfo::Make(SkTMin(kImageWidth, maxRTSize),
                                         SkTMin(kImageHeight, maxRTSize),
                                         kN32_SkColorType, kPremul_SkAlphaType);
    uint32_t flags = 0;
    SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);
    SkSurface* surface = SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info, 0,
                                                    &props);
    return surface;
}

DEF_GPUTEST_FOR_ALL_GL_CONTEXTS(VertexAttributeCount, reporter, ctxInfo) {
    GrContext* context = ctxInfo.fGrContext;
    GrTextureDesc desc;
    desc.fHeight = 1;
    desc.fWidth = 1;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fConfig = kRGBA_8888_GrPixelConfig;
    SkAutoTUnref<GrTexture> target(context->textureProvider()->createTexture(desc,
                                                                             SkBudgeted::kYes));
    if (!target) {
        ERRORF(reporter, "Could not create render target.");
        return;
    }
    SkAutoTUnref<GrDrawContext> dc(context->drawContext(target->asRenderTarget()));
    if (!dc) {
        ERRORF(reporter, "Could not create draw context.");
        return;
    }
    int attribCnt = context->caps()->maxVertexAttributes();
    if (!attribCnt) {
        ERRORF(reporter, "No attributes allowed?!");
        return;
    }
    context->flush();
    context->resetGpuStats();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    SkAutoTUnref<GrDrawBatch> batch;
    GrPipelineBuilder pb;
    pb.setRenderTarget(target->asRenderTarget());
    // This one should succeed.
    batch.reset(new Batch(attribCnt));
    dc->drawContextPriv().testingOnly_drawBatch(pb, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 1);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    context->resetGpuStats();
    // This one should fail.
    batch.reset(new Batch(attribCnt+1));
    dc->drawContextPriv().testingOnly_drawBatch(pb, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 1);
#endif
}

// TODO factor this out into functions, also handle CPU path
SkSurface* setupSurface(GrContextFactory* factory) {
    GrContext* context = factory->get(GrContextFactory::kNative_GLContextType,
                                      GrContextFactory::kNone_GLContextOptions);
    int maxRTSize = context->caps()->maxRenderTargetSize();
    SkImageInfo info = SkImageInfo::Make(SkTMin(kImageWidth, maxRTSize),
                                         SkTMin(kImageHeight, maxRTSize),
                                         kN32_SkColorType, kPremul_SkAlphaType);
    uint32_t flags = 0;
    SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);
    SkSurface* surface = SkSurface::NewRenderTarget(context, SkSurface::kNo_Budgeted, info, 0,
                         &props);
    SkASSERT(surface);

    SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
                      GrContextFactory::kNone_GLContextOptions).fGLContext;
    gl->makeCurrent();
    return surface;
}

DEF_GPUTEST_FOR_ALL_CONTEXTS(VertexAttributeCount, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();

    sk_sp<GrDrawContext> drawContext(context->newDrawContext(SkBackingFit::kApprox,
                                                             1, 1, kRGBA_8888_GrPixelConfig));
    if (!drawContext) {
        ERRORF(reporter, "Could not create draw context.");
        return;
    }
    int attribCnt = context->caps()->maxVertexAttributes();
    if (!attribCnt) {
        ERRORF(reporter, "No attributes allowed?!");
        return;
    }
    context->flush();
    context->resetGpuStats();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    SkAutoTUnref<GrDrawBatch> batch;
    GrPaint grPaint;
    // This one should succeed.
    batch.reset(new Batch(attribCnt));
    drawContext->drawContextPriv().testingOnly_drawBatch(grPaint, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 1);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    context->resetGpuStats();
    // This one should fail.
    batch.reset(new Batch(attribCnt+1));
    drawContext->drawContextPriv().testingOnly_drawBatch(grPaint, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 1);
#endif
}

DEF_GPUTEST_FOR_ALL_CONTEXTS(VertexAttributeCount, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();

    sk_sp<GrRenderTargetContext> renderTargetContext(context->makeDeferredRenderTargetContext(
                                                                     SkBackingFit::kApprox,
                                                                     1, 1, kRGBA_8888_GrPixelConfig,
                                                                     nullptr));
    if (!renderTargetContext) {
        ERRORF(reporter, "Could not create render target context.");
        return;
    }
    int attribCnt = context->caps()->maxVertexAttributes();
    if (!attribCnt) {
        ERRORF(reporter, "No attributes allowed?!");
        return;
    }
    context->flush();
    context->resetGpuStats();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    GrPaint grPaint;
    // This one should succeed.
    renderTargetContext->priv().testingOnly_addDrawOp(Op::Make(attribCnt));
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 1);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    context->resetGpuStats();
    renderTargetContext->priv().testingOnly_addDrawOp(Op::Make(attribCnt + 1));
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 1);
#endif
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(EmptySurfaceSemaphoreTest, reporter, ctxInfo) {
    GrContext* ctx = ctxInfo.grContext();
    if (!ctx->caps()->fenceSyncSupport()) {
        return;
    }

    const SkImageInfo ii = SkImageInfo::Make(MAIN_W, MAIN_H, kRGBA_8888_SkColorType,
                                             kPremul_SkAlphaType);

    sk_sp<SkSurface> mainSurface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo,
                                                             ii, 0, kTopLeft_GrSurfaceOrigin,
                                                             nullptr));

    // Flush surface once without semaphores to make sure there is no peneding IO for it.
    mainSurface->flush();

    GrBackendSemaphore semaphore;
    GrSemaphoresSubmitted submitted = mainSurface->flushAndSignalSemaphores(1, &semaphore);
    REPORTER_ASSERT(reporter, GrSemaphoresSubmitted::kYes == submitted);

    if (kOpenGL_GrBackend == ctxInfo.backend()) {
        GrGLGpu* gpu = static_cast<GrGLGpu*>(ctx->contextPriv().getGpu());
        const GrGLInterface* interface = gpu->glInterface();
        GrGLsync sync = semaphore.glSync();
        REPORTER_ASSERT(reporter, sync);
        bool result;
        GR_GL_CALL_RET(interface, result, IsSync(sync));
        REPORTER_ASSERT(reporter, result);
    }

#ifdef SK_VULKAN
    if (kVulkan_GrBackend == ctxInfo.backend()) {
        GrVkGpu* gpu = static_cast<GrVkGpu*>(ctx->contextPriv().getGpu());
        const GrVkInterface* interface = gpu->vkInterface();
        VkDevice device = gpu->device();
        VkQueue queue = gpu->queue();
        VkCommandPool cmdPool = gpu->cmdPool();
        VkCommandBuffer cmdBuffer;

        // Create Command Buffer
        const VkCommandBufferAllocateInfo cmdInfo = {
            VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,   // sType
            nullptr,                                          // pNext
            cmdPool,                                          // commandPool
            VK_COMMAND_BUFFER_LEVEL_PRIMARY,                  // level
            1                                                 // bufferCount
        };

        VkResult err = GR_VK_CALL(interface, AllocateCommandBuffers(device, &cmdInfo, &cmdBuffer));
        if (err) {
            return;
        }

        VkCommandBufferBeginInfo cmdBufferBeginInfo;
        memset(&cmdBufferBeginInfo, 0, sizeof(VkCommandBufferBeginInfo));
        cmdBufferBeginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
        cmdBufferBeginInfo.pNext = nullptr;
        cmdBufferBeginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
        cmdBufferBeginInfo.pInheritanceInfo = nullptr;

        GR_VK_CALL_ERRCHECK(interface, BeginCommandBuffer(cmdBuffer, &cmdBufferBeginInfo));
        GR_VK_CALL_ERRCHECK(interface, EndCommandBuffer(cmdBuffer));

        VkFenceCreateInfo fenceInfo;
        VkFence fence;

        memset(&fenceInfo, 0, sizeof(VkFenceCreateInfo));
        fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
        err = GR_VK_CALL(interface, CreateFence(device, &fenceInfo, nullptr, &fence));
        SkASSERT(!err);

        VkPipelineStageFlags waitStages = VK_PIPELINE_STAGE_ALL_COMMANDS_BIT;
        VkSubmitInfo submitInfo;
        memset(&submitInfo, 0, sizeof(VkSubmitInfo));
        submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
        submitInfo.pNext = nullptr;
        submitInfo.waitSemaphoreCount = 1;
        VkSemaphore vkSem = semaphore.vkSemaphore();
        submitInfo.pWaitSemaphores = &vkSem;
        submitInfo.pWaitDstStageMask = &waitStages;
        submitInfo.commandBufferCount = 1;
        submitInfo.pCommandBuffers = &cmdBuffer;
        submitInfo.signalSemaphoreCount = 0;
        submitInfo.pSignalSemaphores = nullptr;
        GR_VK_CALL_ERRCHECK(interface, QueueSubmit(queue, 1, &submitInfo, fence));

        err = GR_VK_CALL(interface, WaitForFences(device, 1, &fence, true, 3000000000));

        REPORTER_ASSERT(reporter, err != VK_TIMEOUT);

        GR_VK_CALL(interface, DestroyFence(device, fence, nullptr));
        GR_VK_CALL(interface, DestroySemaphore(device, vkSem, nullptr));
        // If the above test fails the wait semaphore will never be signaled which can cause the
        // device to hang when tearing down (even if just tearing down GL). So we Fail here to
        // kill things.
        if (err == VK_TIMEOUT) {
            SK_ABORT("Waiting on semaphore indefinitely");
        }
    }
#endif
//.........这里部分代码省略.........

void surface_semaphore_test(skiatest::Reporter* reporter,
                            const sk_gpu_test::ContextInfo& mainInfo,
                            const sk_gpu_test::ContextInfo& childInfo1,
                            const sk_gpu_test::ContextInfo& childInfo2,
                            bool flushContext) {
    GrContext* mainCtx = mainInfo.grContext();
    if (!mainCtx->caps()->fenceSyncSupport()) {
        return;
    }

    const SkImageInfo ii = SkImageInfo::Make(MAIN_W, MAIN_H, kRGBA_8888_SkColorType,
                                             kPremul_SkAlphaType);

    sk_sp<SkSurface> mainSurface(SkSurface::MakeRenderTarget(mainCtx, SkBudgeted::kNo,
                                                             ii, 0, kTopLeft_GrSurfaceOrigin,
                                                             nullptr));
    SkCanvas* mainCanvas = mainSurface->getCanvas();
    mainCanvas->clear(SK_ColorBLUE);

    SkAutoTArray<GrBackendSemaphore> semaphores(2);
#ifdef SK_VULKAN
    if (kVulkan_GrBackend == mainInfo.backend()) {
        // Initialize the secondary semaphore instead of having Ganesh create one internally
        GrVkGpu* gpu = static_cast<GrVkGpu*>(mainCtx->contextPriv().getGpu());
        const GrVkInterface* interface = gpu->vkInterface();
        VkDevice device = gpu->device();

        VkSemaphore vkSem;

        VkSemaphoreCreateInfo createInfo;
        createInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
        createInfo.pNext = nullptr;
        createInfo.flags = 0;
        GR_VK_CALL_ERRCHECK(interface, CreateSemaphore(device, &createInfo, nullptr, &vkSem));

        semaphores[1].initVulkan(vkSem);
    }
#endif

    if (flushContext) {
        mainCtx->flushAndSignalSemaphores(2, semaphores.get());
    } else {
        mainSurface->flushAndSignalSemaphores(2, semaphores.get());
    }

    sk_sp<SkImage> mainImage = mainSurface->makeImageSnapshot();
    GrBackendTexture backendTexture = mainImage->getBackendTexture(false);

    draw_child(reporter, childInfo1, backendTexture, semaphores[0]);

#ifdef SK_VULKAN
    if (kVulkan_GrBackend == mainInfo.backend()) {
        // In Vulkan we need to make sure we are sending the correct VkImageLayout in with the
        // backendImage. After the first child draw the layout gets changed to SHADER_READ, so
        // we just manually set that here.
        GrVkImageInfo vkInfo;
        SkAssertResult(backendTexture.getVkImageInfo(&vkInfo));
        vkInfo.updateImageLayout(VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
    }
#endif

    draw_child(reporter, childInfo2, backendTexture, semaphores[1]);
}

static GrTexture* copy_on_gpu(GrTexture* inputTexture, const SkIRect* subset,
                              const CopyParams& copyParams) {
    SkASSERT(!subset || !subset->isEmpty());
    GrContext* context = inputTexture->getContext();
    SkASSERT(context);
    const GrCaps* caps = context->caps();

    // Either it's a cache miss or the original wasn't cached to begin with.
    GrSurfaceDesc rtDesc = inputTexture->desc();
    rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
    rtDesc.fWidth = copyParams.fWidth;
    rtDesc.fHeight = copyParams.fHeight;
    rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);

    // If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
    // fail.
    if (!caps->isConfigRenderable(rtDesc.fConfig, false)) {
        if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
            if (caps->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
                rtDesc.fConfig = kAlpha_8_GrPixelConfig;
            } else if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
                rtDesc.fConfig = kSkia8888_GrPixelConfig;
            } else {
                return nullptr;
            }
        } else if (kRGB_GrColorComponentFlags ==
                   (kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(rtDesc.fConfig))) {
            if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
                rtDesc.fConfig = kSkia8888_GrPixelConfig;
            } else {
                return nullptr;
            }
        } else {
            return nullptr;
        }
    }

    SkAutoTUnref<GrTexture> copy(context->textureProvider()->createTexture(rtDesc,
                                                                           SkBudgeted::kYes));
    if (!copy) {
        return nullptr;
    }

    // TODO: If no scaling is being performed then use copySurface.

    GrPaint paint;
    paint.setGammaCorrect(true);

    // TODO: Initializing these values for no reason cause the compiler is complaining
    SkScalar sx = 0.f;
    SkScalar sy = 0.f;
    if (subset) {
        sx = 1.f / inputTexture->width();
        sy = 1.f / inputTexture->height();
    }

    if (copyParams.fFilter != GrTextureParams::kNone_FilterMode && subset &&
        (subset->width() != copyParams.fWidth || subset->height() != copyParams.fHeight)) {
        SkRect domain;
        domain.fLeft = (subset->fLeft + 0.5f) * sx;
        domain.fTop = (subset->fTop + 0.5f)* sy;
        domain.fRight = (subset->fRight - 0.5f) * sx;
        domain.fBottom = (subset->fBottom - 0.5f) * sy;
        // This would cause us to read values from outside the subset. Surely, the caller knows
        // better!
        SkASSERT(copyParams.fFilter != GrTextureParams::kMipMap_FilterMode);
        paint.addColorFragmentProcessor(
            GrTextureDomainEffect::Make(inputTexture, SkMatrix::I(), domain,
                                        GrTextureDomain::kClamp_Mode,
                                        copyParams.fFilter));
    } else {
        GrTextureParams params(SkShader::kClamp_TileMode, copyParams.fFilter);
        paint.addColorTextureProcessor(inputTexture, SkMatrix::I(), params);
    }
    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);

    SkRect localRect;
    if (subset) {
        localRect = SkRect::Make(*subset);
        localRect.fLeft *= sx;
        localRect.fTop *= sy;
        localRect.fRight *= sx;
        localRect.fBottom *= sy;
    } else {
        localRect = SkRect::MakeWH(1.f, 1.f);
    }

    sk_sp<GrDrawContext> drawContext(context->drawContext(sk_ref_sp(copy->asRenderTarget())));
    if (!drawContext) {
        return nullptr;
    }

    SkRect dstRect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
    drawContext->fillRectToRect(GrNoClip(), paint, SkMatrix::I(), dstRect, localRect);
    return copy.release();
}

// creates a new texture that is the input texture scaled up. If optionalKey is valid it will be
// set on the new texture. stretch controls whether the scaling is done using nearest or bilerp
// filtering and the size to stretch the texture to.
GrTexture* stretch_texture(GrTexture* inputTexture, const SkGrStretch& stretch,
                           SkPixelRef* pixelRef,
                           const GrUniqueKey& optionalKey) {
    SkASSERT(SkGrStretch::kNone_Type != stretch.fType);

    GrContext* context = inputTexture->getContext();
    SkASSERT(context);
    const GrCaps* caps = context->caps();

    // Either it's a cache miss or the original wasn't cached to begin with.
    GrSurfaceDesc rtDesc = inputTexture->desc();
    rtDesc.fFlags =  rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
    rtDesc.fWidth  = stretch.fWidth;
    rtDesc.fHeight = stretch.fHeight;
    rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);

    // If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
    // fail.
    if (!caps->isConfigRenderable(rtDesc.fConfig, false)) {
        if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
            if (caps->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
                rtDesc.fConfig = kAlpha_8_GrPixelConfig;
            } else if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
                rtDesc.fConfig = kSkia8888_GrPixelConfig;
            } else {
                return nullptr;
            }
        } else if (kRGB_GrColorComponentFlags ==
                   (kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(rtDesc.fConfig))) {
            if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
                rtDesc.fConfig = kSkia8888_GrPixelConfig;
            } else {
                return nullptr;
            }
        } else {
            return nullptr;
        }
    }

    SkAutoTUnref<GrTexture> stretched(GrCreateTextureForPixels(context, optionalKey, rtDesc,
                                                               pixelRef, nullptr,0));
    if (!stretched) {
        return nullptr;
    }
    GrPaint paint;

    // If filtering is not desired then we want to ensure all texels in the resampled image are
    // copies of texels from the original.
    GrTextureParams params(SkShader::kClamp_TileMode,
                           SkGrStretch::kBilerp_Type == stretch.fType ?
                              GrTextureParams::kBilerp_FilterMode :
                              GrTextureParams::kNone_FilterMode);
    paint.addColorTextureProcessor(inputTexture, SkMatrix::I(), params);

    SkRect rect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
    SkRect localRect = SkRect::MakeWH(1.f, 1.f);

    SkAutoTUnref<GrDrawContext> drawContext(context->drawContext());
    if (!drawContext) {
        return nullptr;
    }

    drawContext->drawNonAARectToRect(stretched->asRenderTarget(), GrClip::WideOpen(), paint,
                                     SkMatrix::I(), rect, localRect);

    return stretched.detach();
}

DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SRGBMipMaps, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    if (!context->caps()->srgbSupport()) {
        return;
    }

    const int rtS = 16;
    const int texS = rtS * 2;

    // Fill texture with a dither of black and 60% sRGB (~ 32.5% linear) gray. Although there is
    // only one likely failure mode (doing a direct downsample of the sRGB values), this pattern
    // maximizes the minimum error across all three conceivable failure modes:
    // 1) Likely incorrect:
    //      (A + B) / 2
    // 2) No input decode, decode output:
    //      linear_to_srgb((A + B) / 2)
    // 3) Decode input, no output encode:
    //      (srgb_to_linear(A) + srgb_to_linear(B)) / 2

    const U8CPU srgb60 = sk_float_round2int(0.6f * 255.0f);
    static const SkPMColor colors[2] = {
        SkPackARGB32(0xFF, srgb60, srgb60, srgb60),
        SkPackARGB32(0xFF, 0x00, 0x00, 0x00)
    };
    uint32_t texData[texS * texS];
    for (int y = 0; y < texS; ++y) {
        for (int x = 0; x < texS; ++x) {
            texData[y * texS + x] = colors[(x + y) % 2];
        }
    }

    // We can be pretty generous with the error detection, thanks to the choice of input.
    // The closest likely failure mode is off by > 0.1, so anything that encodes within
    // 10/255 of optimal is more than good enough for this test.
    const U8CPU expectedSRGB = sk_float_round2int(
        linear_to_srgb(srgb_to_linear(srgb60 / 255.0f) / 2.0f) * 255.0f);
    const U8CPU expectedLinear = srgb60 / 2;
    const U8CPU error = 10;

    // Create our test texture
    GrSurfaceDesc desc;
    desc.fFlags = kNone_GrSurfaceFlags;
    desc.fConfig = kSRGBA_8888_GrPixelConfig;
    desc.fWidth = texS;
    desc.fHeight = texS;

    GrTextureProvider* texProvider = context->textureProvider();
    SkAutoTUnref<GrTexture> texture(texProvider->createTexture(desc, SkBudgeted::kNo, texData, 0));

    // Create two render target contexts (L32 and S32)
    sk_sp<SkColorSpace> srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
    sk_sp<GrRenderTargetContext> l32RenderTargetContext = context->makeRenderTargetContext(
        SkBackingFit::kExact, rtS, rtS, kRGBA_8888_GrPixelConfig, nullptr);
    sk_sp<GrRenderTargetContext> s32RenderTargetContext = context->makeRenderTargetContext(
        SkBackingFit::kExact, rtS, rtS, kSRGBA_8888_GrPixelConfig, std::move(srgbColorSpace));

    SkRect rect = SkRect::MakeWH(SkIntToScalar(rtS), SkIntToScalar(rtS));
    GrNoClip noClip;
    GrPaint paint;
    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
    GrTextureParams mipMapParams(SkShader::kRepeat_TileMode, GrTextureParams::kMipMap_FilterMode);
    paint.addColorTextureProcessor(texture, nullptr, SkMatrix::MakeScale(0.5f), mipMapParams);

    // 1) Draw texture to S32 surface (should generate/use sRGB mips)
    paint.setGammaCorrect(true);
    s32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect);
    read_and_check_pixels(reporter, s32RenderTargetContext->asTexture().get(), expectedSRGB, error,
                          "first render of sRGB");

    // 2) Draw texture to L32 surface (should generate/use linear mips)
    paint.setGammaCorrect(false);
    l32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect);
    read_and_check_pixels(reporter, l32RenderTargetContext->asTexture().get(), expectedLinear,
                          error, "re-render as linear");

    // 3) Go back to sRGB
    paint.setGammaCorrect(true);
    s32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect);
    read_and_check_pixels(reporter, s32RenderTargetContext->asTexture().get(), expectedSRGB, error,
                          "re-render as sRGB");
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ApplyGamma, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    static const int kW = 256;
    static const int kH = 256;
    static const size_t kRowBytes = sizeof(uint32_t) * kW;

    GrSurfaceDesc baseDesc;
    baseDesc.fConfig = kRGBA_8888_GrPixelConfig;
    baseDesc.fWidth = kW;
    baseDesc.fHeight = kH;

    const SkImageInfo ii = SkImageInfo::MakeN32Premul(kW, kH);

    SkAutoTMalloc<uint32_t> srcPixels(kW * kH);
    for (int y = 0; y < kH; ++y) {
        for (int x = 0; x < kW; ++x) {
            srcPixels.get()[y*kW+x] = SkPreMultiplyARGB(x, y, x, 0xFF);
        }
    }

    SkBitmap bm;
    bm.installPixels(ii, srcPixels.get(), kRowBytes);

    SkAutoTMalloc<uint32_t> read(kW * kH);

    // We allow more error on GPUs with lower precision shader variables.
    float error = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.2f : 0.5f;

    for (auto toSRGB : { false, true }) {
        sk_sp<SkSurface> dst(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));

        if (!dst) {
            ERRORF(reporter, "Could not create surfaces for copy surface test.");
            continue;
        }

        SkCanvas* dstCanvas = dst->getCanvas();

        dstCanvas->clear(SK_ColorRED);
        dstCanvas->flush();

        SkPaint gammaPaint;
        gammaPaint.setBlendMode(SkBlendMode::kSrc);
        gammaPaint.setColorFilter(toSRGB ? SkColorFilter::MakeLinearToSRGBGamma()
                                         : SkColorFilter::MakeSRGBToLinearGamma());

        dstCanvas->drawBitmap(bm, 0, 0, &gammaPaint);
        dstCanvas->flush();

        sk_memset32(read.get(), 0, kW * kH);
        if (!dstCanvas->readPixels(ii, read.get(), kRowBytes, 0, 0)) {
            ERRORF(reporter, "Error calling readPixels");
            continue;
        }

        bool abort = false;
        // Validate that pixels were copied/transformed correctly.
        for (int y = 0; y < kH && !abort; ++y) {
            for (int x = 0; x < kW && !abort; ++x) {
                uint32_t r = read.get()[y * kW + x];
                uint32_t s = srcPixels.get()[y * kW + x];
                uint32_t expected;
                if (!check_gamma(s, r, toSRGB, error, &expected)) {
                    ERRORF(reporter, "Expected dst %d,%d to contain 0x%08x "
                           "from src 0x%08x and mode %s. Got %08x", x, y, expected, s,
                           toSRGB ? "ToSRGB" : "ToLinear", r);
                    abort = true;
                    break;
                }
            }
        }
    }
}