C++ GrRenderTarget::asTexture方法代码示例

sk_sp<SkImage> SkSurface_Gpu::onNewImageSnapshot(SkBudgeted budgeted, ForceCopyMode forceCopyMode) {
    GrRenderTarget* rt = fDevice->accessDrawContext()->accessRenderTarget();
    SkASSERT(rt);
    GrTexture* tex = rt->asTexture();
    SkAutoTUnref<GrTexture> copy;
    // If the original render target is a buffer originally created by the client, then we don't
    // want to ever retarget the SkSurface at another buffer we create. Force a copy now to avoid
    // copy-on-write.
    if (kYes_ForceCopyMode == forceCopyMode || !tex || rt->resourcePriv().refsWrappedObjects()) {
        GrSurfaceDesc desc = fDevice->accessDrawContext()->desc();
        GrContext* ctx = fDevice->context();
        desc.fFlags = desc.fFlags & ~kRenderTarget_GrSurfaceFlag;
        copy.reset(ctx->textureProvider()->createTexture(desc, budgeted));
        if (!copy) {
            return nullptr;
        }
        if (!ctx->copySurface(copy, rt)) {
            return nullptr;
        }
        tex = copy;
    }
    const SkImageInfo info = fDevice->imageInfo();
    sk_sp<SkImage> image;
    if (tex) {
        image = sk_make_sp<SkImage_Gpu>(info.width(), info.height(), kNeedNewImageUniqueID,
                                        info.alphaType(), tex, sk_ref_sp(info.colorSpace()),
                                        budgeted);
    }
    return image;
}

Canvas2DLayerBridge::Canvas2DLayerBridge(PassRefPtr<GraphicsContext3D> context, SkDeferredCanvas* canvas, OpacityMode opacityMode, ThreadMode threadMode)
    : m_canvas(canvas)
    , m_context(context)
    , m_bytesAllocated(0)
    , m_didRecordDrawCommand(false)
    , m_framesPending(0)
    , m_next(0)
    , m_prev(0)
#if ENABLE(CANVAS_USES_MAILBOX)
    , m_lastImageId(0)
#endif
{
    ASSERT(m_canvas);
    // Used by browser tests to detect the use of a Canvas2DLayerBridge.
    TRACE_EVENT_INSTANT0("test_gpu", "Canvas2DLayerBridgeCreation");
    m_canvas->setNotificationClient(this);
#if ENABLE(CANVAS_USES_MAILBOX)
    m_layer = adoptPtr(WebKit::Platform::current()->compositorSupport()->createExternalTextureLayerForMailbox(this));
#else
    m_layer = adoptPtr(WebKit::Platform::current()->compositorSupport()->createExternalTextureLayer(this));
    m_layer->setRateLimitContext(threadMode == SingleThread);
    GrRenderTarget* renderTarget = reinterpret_cast<GrRenderTarget*>(m_canvas->getDevice()->accessRenderTarget());
    if (renderTarget) {
        m_layer->setTextureId(renderTarget->asTexture()->getTextureHandle());
    }
#endif
    m_layer->setOpaque(opacityMode == Opaque);
    GraphicsLayerChromium::registerContentsLayer(m_layer->layer());
}

SkImage* SkSurface_Gpu::onNewImageSnapshot(SkBudgeted budgeted, ForceCopyMode forceCopyMode) {
    GrRenderTarget* rt = fDevice->accessRenderTarget();
    SkASSERT(rt);
    GrTexture* tex = rt->asTexture();
    SkAutoTUnref<GrTexture> copy;
    // TODO: Force a copy when the rt is an external resource.
    if (kYes_ForceCopyMode == forceCopyMode || !tex) {
        GrSurfaceDesc desc = fDevice->accessRenderTarget()->desc();
        GrContext* ctx = fDevice->context();
        desc.fFlags = desc.fFlags & ~kRenderTarget_GrSurfaceFlag;
        copy.reset(ctx->textureProvider()->createTexture(desc, budgeted));
        if (!copy) {
            return nullptr;
        }
        if (!ctx->copySurface(copy, rt)) {
            return nullptr;
        }
        tex = copy;
    }
    const SkImageInfo info = fDevice->imageInfo();
    SkImage* image = nullptr;
    if (tex) {
        image = new SkImage_Gpu(info.width(), info.height(), kNeedNewImageUniqueID,
                                info.alphaType(), tex, budgeted);
    }
    return image;
}

Platform3DObject AcceleratedImageBufferSurface::getBackingTexture() const
{
    GrRenderTarget* renderTarget = m_canvas->getTopDevice()->accessRenderTarget();
    if (renderTarget) {
        return renderTarget->asTexture()->getTextureHandle();
    }
    return 0;
}

GrBackendObject SkSurface_Gpu::onGetTextureHandle(BackendHandleAccess access) {
    GrRenderTarget* rt = prepare_rt_for_external_access(this, access);
    GrTexture* texture = rt->asTexture();
    if (texture) {
        return texture->getTextureHandle();
    }
    return 0;
}

unsigned Canvas2DLayerBridge::backBufferTexture()
{
    contextAcquired();
    m_canvas->flush();
    m_context->flush();
    GrRenderTarget* renderTarget = reinterpret_cast<GrRenderTarget*>(m_canvas->getDevice()->accessRenderTarget());
    if (renderTarget) {
        return renderTarget->asTexture()->getTextureHandle();
    }
    return 0;
}

// Create a new render target and, if necessary, copy the contents of the old
// render target into it. Note that this flushes the SkGpuDevice but
// doesn't force an OpenGL flush.
void SkSurface_Gpu::onCopyOnWrite(ContentChangeMode mode) {
    GrRenderTarget* rt = fDevice->accessDrawContext()->accessRenderTarget();
    // are we sharing our render target with the image? Note this call should never create a new
    // image because onCopyOnWrite is only called when there is a cached image.
    sk_sp<SkImage> image(this->refCachedImage(SkBudgeted::kNo, kNo_ForceUnique));
    SkASSERT(image);
    if (rt->asTexture() == as_IB(image)->peekTexture()) {
        this->fDevice->replaceDrawContext(SkSurface::kRetain_ContentChangeMode == mode);
        SkTextureImageApplyBudgetedDecision(image.get());
    } else if (kDiscard_ContentChangeMode == mode) {
        this->SkSurface_Gpu::onDiscard();
    }
}

// Create a new render target and, if necessary, copy the contents of the old
// render target into it. Note that this flushes the SkGpuDevice but
// doesn't force an OpenGL flush.
void SkSurface_Gpu::onCopyOnWrite(ContentChangeMode mode) {
    GrRenderTarget* rt = fDevice->accessRenderTarget();
    // are we sharing our render target with the image? Note this call should never create a new
    // image because onCopyOnWrite is only called when there is a cached image.
    SkImage* image = this->getCachedImage(kNo_Budgeted);
    SkASSERT(image);
    if (rt->asTexture() == SkTextureImageGetTexture(image)) {
        this->fDevice->replaceRenderTarget(SkSurface::kRetain_ContentChangeMode == mode);
        SkTextureImageApplyBudgetedDecision(image);
    } else if (kDiscard_ContentChangeMode == mode) {
        this->SkSurface_Gpu::onDiscard();
    }
}

Platform3DObject Canvas2DLayerBridge::getBackingTexture()
{
    ASSERT(!m_destructionInProgress);
    if (!checkSurfaceValid())
        return 0;
    m_canvas->flush();
    context()->flush();
    GrRenderTarget* renderTarget = m_canvas->getTopDevice()->accessRenderTarget();
    if (renderTarget) {
        return renderTarget->asTexture()->getTextureHandle();
    }
    return 0;
}

unsigned Canvas2DLayerBridge::prepareTexture(WebTextureUpdater& updater)
{
    m_context->makeContextCurrent();

    if (m_canvas) {
        TRACE_EVENT0("cc", "Canvas2DLayerBridge::SkCanvas::flush");
        m_canvas->flush();
    }

    m_context->flush();

    if (m_useDoubleBuffering) {
        updater.appendCopy(m_backBufferTexture, m_frontBufferTexture, m_size);
        return m_frontBufferTexture;
    }

    if (m_canvas) {
        // Notify skia that the state of the backing store texture object will be touched by the compositor
        GrRenderTarget* renderTarget = reinterpret_cast<GrRenderTarget*>(m_canvas->getDevice()->accessRenderTarget());
        if (renderTarget)
            renderTarget->asTexture()->invalidateCachedState();
    }
    return m_backBufferTexture;
}

bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                           const GrPipelineOptimizations& optimizations,
                                           GrXferProcessor::DstTexture* dstTexture,
                                           const SkRect& batchBounds) {
    SkRect bounds = batchBounds;
    bounds.outset(0.5f, 0.5f);

    if (!pipelineBuilder.willXPNeedDstTexture(*this->caps(), optimizations)) {
        return true;
    }

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    if (this->caps()->textureBarrierSupport()) {
        if (GrTexture* rtTex = rt->asTexture()) {
            // The render target is a texture, so we can read from it directly in the shader. The XP
            // will be responsible to detect this situation and request a texture barrier.
            dstTexture->setTexture(rtTex);
            dstTexture->setOffset(0, 0);
            return true;
        }
    }

    SkIRect copyRect;
    pipelineBuilder.clip().getConservativeBounds(rt->width(), rt->height(), &copyRect);

    SkIRect drawIBounds;
    bounds.roundOut(&drawIBounds);
    if (!copyRect.intersect(drawIBounds)) {
#ifdef SK_DEBUG
        GrCapsDebugf(this->caps(), "Missed an early reject. "
                                   "Bailing on draw from setupDstReadIfNecessary.\n");
#endif
        return false;
    }

    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
    // have per-sample dst values by making the copy multisampled.
    GrSurfaceDesc desc;
    if (!fGpu->initCopySurfaceDstDesc(rt, &desc)) {
        desc.fOrigin = kDefault_GrSurfaceOrigin;
        desc.fFlags = kRenderTarget_GrSurfaceFlag;
        desc.fConfig = rt->config();
    }

    desc.fWidth = copyRect.width();
    desc.fHeight = copyRect.height();

    static const uint32_t kFlags = 0;
    SkAutoTUnref<GrTexture> copy(fResourceProvider->createApproxTexture(desc, kFlags));

    if (!copy) {
        SkDebugf("Failed to create temporary copy of destination texture.\n");
        return false;
    }
    SkIPoint dstPoint = {0, 0};
    this->copySurface(copy, rt, copyRect, dstPoint);
    dstTexture->setTexture(copy);
    dstTexture->setOffset(copyRect.fLeft, copyRect.fTop);
    return true;
}