C++ GrBackendTexture类代码示例

sk_sp<SkSurface> SkSurface::MakeFromBackendTextureAsRenderTarget(GrContext* context,
                                                                 const GrBackendTexture& tex,
                                                                 GrSurfaceOrigin origin,
                                                                 int sampleCnt,
                                                                 sk_sp<SkColorSpace> colorSpace,
                                                                 const SkSurfaceProps* props) {
    if (!context) {
        return nullptr;
    }
    if (!SkSurface_Gpu::Valid(context, tex.config(), colorSpace.get())) {
        return nullptr;
    }
    sampleCnt = SkTMax(1, sampleCnt);

    sk_sp<GrRenderTargetContext> rtc(
        context->contextPriv().makeBackendTextureAsRenderTargetRenderTargetContext(
                                                                              tex,
                                                                              origin,
                                                                              sampleCnt,
                                                                              std::move(colorSpace),
                                                                              props));
    if (!rtc) {
        return nullptr;
    }

    sk_sp<SkGpuDevice> device(SkGpuDevice::Make(context, std::move(rtc), tex.width(), tex.height(),
                                                SkGpuDevice::kUninit_InitContents));
    if (!device) {
        return nullptr;
    }
    return sk_make_sp<SkSurface_Gpu>(std::move(device));
}

void GrMockGpu::deleteBackendTexture(const GrBackendTexture& tex) {
    SkASSERT(GrBackendApi::kMock == tex.backend());

    GrMockTextureInfo info;
    if (tex.getMockTextureInfo(&info)) {
        fOutstandingTestingOnlyTextureIDs.remove(info.fID);
    }
}

bool GrMockGpu::isTestingOnlyBackendTexture(const GrBackendTexture& tex) const {
    SkASSERT(GrBackendApi::kMock == tex.backend());

    GrMockTextureInfo info;
    if (!tex.getMockTextureInfo(&info)) {
        return false;
    }

    return fOutstandingTestingOnlyTextureIDs.contains(info.fID);
}

sk_sp<GrRenderTarget> GrGpu::wrapBackendTextureAsRenderTarget(const GrBackendTexture& tex,
                                                              int sampleCnt) {
    if (0 == this->caps()->getRenderTargetSampleCount(sampleCnt, tex.config())) {
        return nullptr;
    }
    int maxSize = this->caps()->maxTextureSize();
    if (tex.width() > maxSize || tex.height() > maxSize) {
        return nullptr;
    }
    this->handleDirtyContext();
    return this->onWrapBackendTextureAsRenderTarget(tex, sampleCnt);
}

sk_sp<GrTexture> GrMockGpu::onWrapBackendTexture(const GrBackendTexture& tex,
                                                 GrWrapOwnership ownership,
                                                 GrWrapCacheable wrapType, GrIOType ioType) {
    GrSurfaceDesc desc;
    desc.fWidth = tex.width();
    desc.fHeight = tex.height();

    GrMockTextureInfo info;
    SkAssertResult(tex.getMockTextureInfo(&info));
    desc.fConfig = info.fConfig;

    GrMipMapsStatus mipMapsStatus = tex.hasMipMaps() ? GrMipMapsStatus::kValid
                                                     : GrMipMapsStatus::kNotAllocated;

    return sk_sp<GrTexture>(new GrMockTexture(this, desc, mipMapsStatus, info, wrapType, ioType));
}

void wrap_tex_test(skiatest::Reporter* reporter, GrContext* context) {

    GrVkGpu* gpu = static_cast<GrVkGpu*>(context->contextPriv().getGpu());

    GrBackendTexture origBackendTex = gpu->createTestingOnlyBackendTexture(nullptr, kW, kH,
                                                                           kPixelConfig, false,
                                                                           GrMipMapped::kNo);
    const GrVkImageInfo* imageInfo = origBackendTex.getVkImageInfo();

    sk_sp<GrTexture> tex = gpu->wrapBackendTexture(origBackendTex, kBorrow_GrWrapOwnership);
    REPORTER_ASSERT(reporter, tex);

    // image is null
    {
        GrVkImageInfo backendCopy = *imageInfo;
        backendCopy.fImage = VK_NULL_HANDLE;
        GrBackendTexture backendTex = GrBackendTexture(kW, kH, backendCopy);
        tex = gpu->wrapBackendTexture(backendTex, kBorrow_GrWrapOwnership);
        REPORTER_ASSERT(reporter, !tex);
        tex = gpu->wrapBackendTexture(backendTex, kAdopt_GrWrapOwnership);
        REPORTER_ASSERT(reporter, !tex);
    }

    // alloc is null
    {
        GrVkImageInfo backendCopy = *imageInfo;
        backendCopy.fAlloc = GrVkAlloc();
        GrBackendTexture backendTex = GrBackendTexture(kW, kH, backendCopy);
        tex = gpu->wrapBackendTexture(backendTex, kBorrow_GrWrapOwnership);
        REPORTER_ASSERT(reporter, !tex);
        tex = gpu->wrapBackendTexture(backendTex, kAdopt_GrWrapOwnership);
        REPORTER_ASSERT(reporter, !tex);
    }

    // check adopt creation
    {
        GrVkImageInfo backendCopy = *imageInfo;
        GrBackendTexture backendTex = GrBackendTexture(kW, kH, backendCopy);
        tex = gpu->wrapBackendTexture(backendTex, kAdopt_GrWrapOwnership);

        REPORTER_ASSERT(reporter, tex);
    }

    gpu->deleteTestingOnlyBackendTexture(&origBackendTex, true);
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReimportImageTextureWithMipLevels, reporter, ctxInfo) {
    auto* ctx = ctxInfo.grContext();
    if (!ctx->priv().caps()->mipMapSupport()) {
        return;
    }
    static constexpr auto kCreateWithMipMaps = true;
    auto surf = SkSurface::MakeRenderTarget(
            ctx, SkBudgeted::kYes,
            SkImageInfo::Make(100, 100, kRGBA_8888_SkColorType, kPremul_SkAlphaType), 1,
            kTopLeft_GrSurfaceOrigin, nullptr, kCreateWithMipMaps);
    if (!surf) {
        return;
    }
    surf->getCanvas()->drawColor(SK_ColorDKGRAY);
    auto img = surf->makeImageSnapshot();
    if (!img) {
        return;
    }
    surf.reset();
    GrBackendTexture btex;
    SkImage::BackendTextureReleaseProc texRelease;
    if (!SkImage::MakeBackendTextureFromSkImage(ctx, std::move(img), &btex, &texRelease)) {
        // Not all backends support stealing textures yet.
        // ERRORF(reporter, "Could not turn image into texture");
        return;
    }
    REPORTER_ASSERT(reporter, btex.hasMipMaps());
    // Reimport the texture as an image and perform a downsampling draw with medium quality which
    // should use the upper MIP levels.
    img = SkImage::MakeFromTexture(ctx, btex, kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType,
                                   kPremul_SkAlphaType, nullptr);
    const auto singlePixelInfo =
            SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType, nullptr);
    surf = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kYes, singlePixelInfo, 1,
                                       kTopLeft_GrSurfaceOrigin, nullptr);
    SkPaint paint;
    paint.setFilterQuality(kMedium_SkFilterQuality);
    surf->getCanvas()->drawImageRect(img, SkRect::MakeWH(1, 1), &paint);
    uint32_t pixel;
    surf->readPixels(singlePixelInfo, &pixel, sizeof(uint32_t), 0, 0);
    REPORTER_ASSERT(reporter, pixel == SkPreMultiplyColor(SK_ColorDKGRAY));
    img.reset();
    texRelease(btex);
}

sk_sp<GrRenderTarget> GrMockGpu::onWrapBackendTextureAsRenderTarget(const GrBackendTexture& tex,
                                                                    int sampleCnt) {
    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = tex.width();
    desc.fHeight = tex.height();

    GrMockTextureInfo texInfo;
    SkAssertResult(tex.getMockTextureInfo(&texInfo));
    desc.fConfig = texInfo.fConfig;
    desc.fSampleCnt = sampleCnt;

    GrMockRenderTargetInfo rtInfo;
    rtInfo.fConfig = texInfo.fConfig;
    // The client gave us the texture ID but we supply the render target ID.
    rtInfo.fID = NextInternalRenderTargetID();

    return sk_sp<GrRenderTarget>(
            new GrMockRenderTarget(this, GrMockRenderTarget::kWrapped, desc, rtInfo));
}

static sk_sp<GrTextureProxy> create_wrapped_backend(GrContext* context, SkBackingFit fit,
                                                    sk_sp<GrTexture>* backingSurface) {
    GrProxyProvider* proxyProvider = context->priv().proxyProvider();
    GrResourceProvider* resourceProvider = context->priv().resourceProvider();

    const GrSurfaceDesc desc = make_desc(kNone_GrSurfaceFlags);

    *backingSurface = resourceProvider->createTexture(desc, SkBudgeted::kNo,
                                                      GrResourceProvider::Flags::kNoPendingIO);
    if (!(*backingSurface)) {
        return nullptr;
    }

    GrBackendTexture backendTex = (*backingSurface)->getBackendTexture();
    backendTex.setPixelConfig(desc.fConfig);

    return proxyProvider->wrapBackendTexture(backendTex, kBottomLeft_GrSurfaceOrigin,
                                             kBorrow_GrWrapOwnership, GrWrapCacheable::kYes,
                                             kRead_GrIOType);
}

sk_sp<GrTexture> GrMockGpu::onWrapRenderableBackendTexture(const GrBackendTexture& tex,
                                                           int sampleCnt,
                                                           GrWrapOwnership ownership) {
    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = tex.width();
    desc.fHeight = tex.height();

    GrMockTextureInfo texInfo;
    SkAssertResult(tex.getMockTextureInfo(&texInfo));
    desc.fConfig = texInfo.fConfig;

    GrMipMapsStatus mipMapsStatus =
            tex.hasMipMaps() ? GrMipMapsStatus::kValid : GrMipMapsStatus::kNotAllocated;

    GrMockRenderTargetInfo rtInfo;
    rtInfo.fConfig = texInfo.fConfig;
    // The client gave us the texture ID but we supply the render target ID.
    rtInfo.fID = NextInternalRenderTargetID();

    return sk_sp<GrTexture>(
            new GrMockTextureRenderTarget(this, desc, mipMapsStatus, texInfo, rtInfo));
}

sk_sp<GrTexture> GrGpu::wrapRenderableBackendTexture(const GrBackendTexture& backendTex,
                                                     int sampleCnt, GrWrapOwnership ownership) {
    this->handleDirtyContext();
    if (sampleCnt < 1) {
        return nullptr;
    }
    if (!this->caps()->isConfigTexturable(backendTex.config()) ||
        !this->caps()->getRenderTargetSampleCount(sampleCnt, backendTex.config())) {
        return nullptr;
    }

    if (backendTex.width() > this->caps()->maxRenderTargetSize() ||
        backendTex.height() > this->caps()->maxRenderTargetSize()) {
        return nullptr;
    }
    sk_sp<GrTexture> tex = this->onWrapRenderableBackendTexture(backendTex, sampleCnt, ownership);
    if (tex && !backendTex.hasMipMaps()) {
        // Ganesh will not ever allocate mipmaps for a wrapped resource. By setting this flag here,
        // it will be propagated to any proxy that wraps this texture.
        tex->texturePriv().setDoesNotSupportMipMaps();
    }
    SkASSERT(!tex || tex->asRenderTarget());
    return tex;
}

void wrap_rt_test(skiatest::Reporter* reporter, GrContext* context) {
    GrVkGpu* gpu = static_cast<GrVkGpu*>(context->contextPriv().getGpu());

    GrBackendTexture origBackendTex = gpu->createTestingOnlyBackendTexture(nullptr, kW, kH,
                                                                           kPixelConfig, true,
                                                                           GrMipMapped::kNo);
    const GrVkImageInfo* imageInfo = origBackendTex.getVkImageInfo();

    GrBackendRenderTarget origBackendRT(kW, kH, 1, 0, *imageInfo);

    sk_sp<GrRenderTarget> rt = gpu->wrapBackendRenderTarget(origBackendRT);
    REPORTER_ASSERT(reporter, rt);

    // image is null
    {
        GrVkImageInfo backendCopy = *imageInfo;
        backendCopy.fImage = VK_NULL_HANDLE;
        GrBackendRenderTarget backendRT(kW, kH, 1, 0, backendCopy);
        rt = gpu->wrapBackendRenderTarget(backendRT);
        REPORTER_ASSERT(reporter, !rt);
    }

    // alloc is null
    {
        GrVkImageInfo backendCopy = *imageInfo;
        backendCopy.fAlloc = GrVkAlloc();
        // can wrap null alloc
        GrBackendRenderTarget backendRT(kW, kH, 1, 0, backendCopy);
        rt = gpu->wrapBackendRenderTarget(backendRT);
        REPORTER_ASSERT(reporter, rt);
    }

    // When we wrapBackendRenderTarget it is always borrowed, so we must make sure to free the
    // resource when we're done.
    gpu->deleteTestingOnlyBackendTexture(&origBackendTex);
}

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]);
}

sk_sp<GrTextureProxy> GrAHardwareBufferImageGenerator::makeProxy(GrContext* context) {
    if (context->abandoned()) {
        return nullptr;
    }

    GrPixelConfig pixelConfig;
    GrBackendFormat backendFormat = get_backend_format(context->contextPriv().getBackend(),
                                                       fBufferFormat);
    if (!context->contextPriv().caps()->getConfigFromBackendFormat(
            backendFormat, this->getInfo().colorType(), &pixelConfig)) {
        return nullptr;
    }

    int width = this->getInfo().width();
    int height = this->getInfo().height();

    GrSurfaceDesc desc;
    desc.fWidth = width;
    desc.fHeight = height;
    desc.fConfig = pixelConfig;

    GrTextureType textureType = GrTextureType::k2D;
    if (context->contextPriv().getBackend() == kOpenGL_GrBackend) {
        textureType = GrTextureType::kExternal;
    }

    auto proxyProvider = context->contextPriv().proxyProvider();

    AHardwareBuffer* hardwareBuffer = fHardwareBuffer;
    AHardwareBuffer_acquire(hardwareBuffer);

    const bool isProtectedContent = fIsProtectedContent;

    sk_sp<GrTextureProxy> texProxy = proxyProvider->createLazyProxy(
            [context, hardwareBuffer, width, height, pixelConfig, isProtectedContent, backendFormat]
            (GrResourceProvider* resourceProvider) {
                if (!resourceProvider) {
                    AHardwareBuffer_release(hardwareBuffer);
                    return sk_sp<GrTexture>();
                }

                DeleteImageProc deleteImageProc = nullptr;
                DeleteImageCtx deleteImageCtx = nullptr;

                GrBackendTexture backendTex = make_backend_texture(context, hardwareBuffer,
                                                                   width, height, pixelConfig,
                                                                   &deleteImageProc,
                                                                   &deleteImageCtx,
                                                                   isProtectedContent,
                                                                   backendFormat);
                if (!backendTex.isValid()) {
                    return sk_sp<GrTexture>();
                }
                SkASSERT(deleteImageProc && deleteImageCtx);

                backendTex.fConfig = pixelConfig;
                sk_sp<GrTexture> tex = resourceProvider->wrapBackendTexture(backendTex);
                if (!tex) {
                    deleteImageProc(deleteImageCtx);
                    return sk_sp<GrTexture>();
                }

                if (deleteImageProc) {
                    sk_sp<GrReleaseProcHelper> releaseProcHelper(
                            new GrReleaseProcHelper(deleteImageProc, deleteImageCtx));
                    tex->setRelease(releaseProcHelper);
                }

                return tex;
            },
            desc, fSurfaceOrigin, GrMipMapped::kNo, textureType, SkBackingFit::kExact,
            SkBudgeted::kNo);

    if (!texProxy) {
        AHardwareBuffer_release(hardwareBuffer);
    }
    return texProxy;
}

DEF_GPUTEST_FOR_VULKAN_CONTEXT(VkImageLayoutTest, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrVkGpu* gpu = static_cast<GrVkGpu*>(context->contextPriv().getGpu());

    GrBackendTexture backendTex = gpu->createTestingOnlyBackendTexture(nullptr, 1, 1,
                                                                       kRGBA_8888_GrPixelConfig,
                                                                       false,
                                                                       GrMipMapped::kNo);
    REPORTER_ASSERT(reporter, backendTex.isValid());

    GrVkImageInfo info;
    REPORTER_ASSERT(reporter, backendTex.getVkImageInfo(&info));
    VkImageLayout initLayout = info.fImageLayout;

    // Verify that setting that layout via a copy of a backendTexture is reflected in all the
    // backendTextures.
    GrBackendTexture backendTexCopy = backendTex;
    REPORTER_ASSERT(reporter, backendTexCopy.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, initLayout == info.fImageLayout);

    backendTexCopy.setVkImageLayout(VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

    REPORTER_ASSERT(reporter, backendTex.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL == info.fImageLayout);

    REPORTER_ASSERT(reporter, backendTexCopy.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL == info.fImageLayout);

    // Setting back the layout since we didn't actually change it
    backendTex.setVkImageLayout(initLayout);

    sk_sp<SkImage> wrappedImage = SkImage::MakeFromTexture(context, backendTex,
                                                           kTopLeft_GrSurfaceOrigin,
                                                           kRGBA_8888_SkColorType,
                                                           kPremul_SkAlphaType, nullptr);
    REPORTER_ASSERT(reporter, wrappedImage.get());

    sk_sp<GrTextureProxy> texProxy = as_IB(wrappedImage)->asTextureProxyRef();
    REPORTER_ASSERT(reporter, texProxy.get());
    REPORTER_ASSERT(reporter, texProxy->priv().isInstantiated());
    GrTexture* texture = texProxy->priv().peekTexture();
    REPORTER_ASSERT(reporter, texture);

    // Verify that modifying the layout via the GrVkTexture is reflected in the GrBackendTexture
    GrVkTexture* vkTexture = static_cast<GrVkTexture*>(texture);
    REPORTER_ASSERT(reporter, initLayout == vkTexture->currentLayout());
    vkTexture->updateImageLayout(VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);

    REPORTER_ASSERT(reporter, backendTex.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL == info.fImageLayout);

    GrBackendTexture backendTexImage = wrappedImage->getBackendTexture(false);
    REPORTER_ASSERT(reporter, backendTexImage.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL == info.fImageLayout);

    // Verify that modifying the layout via the GrBackendTexutre is reflected in the GrVkTexture
    backendTexImage.setVkImageLayout(VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL == vkTexture->currentLayout());

#ifdef SK_SUPPORT_LEGACY_BACKEND_OBJECTS
    // Verify that modifying the layout via the old textureHandle sitll works in is reflected in the
    // GrVkTexture and GrBackendTexture.
    GrVkImageInfo* backendInfo = (GrVkImageInfo*)wrappedImage->getTextureHandle(false);
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL == backendInfo->fImageLayout);

    backendInfo->updateImageLayout(VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
    REPORTER_ASSERT(reporter,
                    VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL == vkTexture->currentLayout());
    REPORTER_ASSERT(reporter, backendTexImage.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL == info.fImageLayout);
#endif

    vkTexture->updateImageLayout(initLayout);

    REPORTER_ASSERT(reporter, backendTex.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, initLayout == info.fImageLayout);

    REPORTER_ASSERT(reporter, backendTexCopy.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, initLayout == info.fImageLayout);

    REPORTER_ASSERT(reporter, backendTexImage.getVkImageInfo(&info));
    REPORTER_ASSERT(reporter, initLayout == info.fImageLayout);

    // Check that we can do things like assigning the backend texture to invalid one, assign an
    // invalid one, assin a backend texture to inself etc. Success here is that we don't hit any of
    // our ref counting asserts.
    REPORTER_ASSERT(reporter, GrBackendTexture::TestingOnly_Equals(backendTex, backendTexCopy));

    GrBackendTexture invalidTexture;
    REPORTER_ASSERT(reporter, !invalidTexture.isValid());
    REPORTER_ASSERT(reporter, !GrBackendTexture::TestingOnly_Equals(invalidTexture, backendTexCopy));

    backendTexCopy = invalidTexture;
    REPORTER_ASSERT(reporter, !backendTexCopy.isValid());
    REPORTER_ASSERT(reporter, !GrBackendTexture::TestingOnly_Equals(invalidTexture, backendTexCopy));

    invalidTexture = backendTex;
    REPORTER_ASSERT(reporter, invalidTexture.isValid());
    REPORTER_ASSERT(reporter, GrBackendTexture::TestingOnly_Equals(invalidTexture, backendTex));

//.........这里部分代码省略.........