Example #1
0
Image* HTMLCanvasElement::copiedImage() const
{
    if (!m_copiedImage && buffer()) {
        if (m_context && m_context->is3d()) {
            toWebGLRenderingContext(m_context.get())->setSavingImage(true);
            m_context->paintRenderingResultsToCanvas();
            toWebGLRenderingContext(m_context.get())->setSavingImage(false);
        }
        m_copiedImage = buffer()->copyImage(CopyBackingStore, Unscaled);
        updateExternallyAllocatedMemory();
    }
    return m_copiedImage.get();
}
Example #2
0
void HTMLCanvasElement::paint(GraphicsContext* context, const LayoutRect& r)
{
    if (m_context) {
        if (!paintsIntoCanvasBuffer())
            return;
        m_context->paintRenderingResultsToCanvas();
    }

    if (hasImageBuffer()) {
        ImageBuffer* imageBuffer = buffer();
        if (imageBuffer) {
            CompositeOperator compositeOperator = !m_context || m_context->hasAlpha() ? CompositeSourceOver : CompositeCopy;
            if (m_presentedImage)
                context->drawImage(m_presentedImage.get(), pixelSnappedIntRect(r), compositeOperator, DoNotRespectImageOrientation);
            else
                context->drawImageBuffer(imageBuffer, pixelSnappedIntRect(r), 0, compositeOperator);
        }
    } else {
        // When alpha is false, we should draw to opaque black.
        if (m_context && !m_context->hasAlpha())
            context->fillRect(FloatRect(r), Color(0, 0, 0));
    }

    if (is3D())
        toWebGLRenderingContext(m_context.get())->markLayerComposited();
}
Example #3
0
void HTMLCanvasElement::reset()
{
    if (m_ignoreReset)
        return;

    resetDirtyRect();

    bool ok;
    bool hadImageBuffer = hasImageBuffer();

    int w = getAttribute(widthAttr).toInt(&ok);
    if (!ok || w < 0)
        w = DefaultWidth;

    int h = getAttribute(heightAttr).toInt(&ok);
    if (!ok || h < 0)
        h = DefaultHeight;

    if (m_contextStateSaver) {
        // Reset to the initial graphics context state.
        m_contextStateSaver->restore();
        m_contextStateSaver->save();
    }

    if (m_context && m_context->is2d())
        toCanvasRenderingContext2D(m_context.get())->reset();

    IntSize oldSize = size();
    IntSize newSize(w, h);

    // If the size of an existing buffer matches, we can just clear it instead of reallocating.
    // This optimization is only done for 2D canvases for now.
    if (hadImageBuffer && oldSize == newSize && m_context && m_context->is2d()) {
        if (!m_didClearImageBuffer)
            clearImageBuffer();
        return;
    }

    setSurfaceSize(newSize);

    if (m_context && m_context->is3d() && oldSize != size())
        toWebGLRenderingContext(m_context.get())->reshape(width(), height());

    if (RenderObject* renderer = this->renderer()) {
        if (renderer->isCanvas()) {
            if (oldSize != size()) {
                toRenderHTMLCanvas(renderer)->canvasSizeChanged();
                if (renderBox() && renderBox()->hasAcceleratedCompositing())
                    renderBox()->contentChanged(CanvasChanged);
            }
            if (hadImageBuffer)
                renderer->setShouldDoFullPaintInvalidation(true);
        }
    }

    WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator end = m_observers.end();
    for (WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator it = m_observers.begin(); it != end; ++it)
        (*it)->canvasResized(this);
}
void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
{
    v8::Handle<v8::Object> holder = info.Holder();
    v8::Isolate* isolate = info.GetIsolate();
    HTMLCanvasElement* impl = V8HTMLCanvasElement::toNative(holder);
    TOSTRING_VOID(V8StringResource<>, contextIdResource, info[0]);
    String contextId = contextIdResource;
    RefPtr<CanvasContextAttributes> attributes = nullptr;
    if (contextId == "webgl" || contextId == "experimental-webgl") {
        RefPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
        if (info.Length() > 1 && info[1]->IsObject()) {
            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
            if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
                webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
            v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
            if (jsAttributes->Has(depth) && !isUndefinedOrNull(jsAttributes->Get(depth)))
                webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
            v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
            if (jsAttributes->Has(stencil) && !isUndefinedOrNull(jsAttributes->Get(stencil)))
                webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
            v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
            if (jsAttributes->Has(antialias) && !isUndefinedOrNull(jsAttributes->Get(antialias)))
                webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
            v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
            if (jsAttributes->Has(premultipliedAlpha) && !isUndefinedOrNull(jsAttributes->Get(premultipliedAlpha)))
                webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
            v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
            if (jsAttributes->Has(preserveDrawingBuffer) && !isUndefinedOrNull(jsAttributes->Get(preserveDrawingBuffer)))
                webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
            v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
            if (jsAttributes->Has(failIfMajorPerformanceCaveat) && !isUndefinedOrNull(jsAttributes->Get(failIfMajorPerformanceCaveat)))
                webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
        }
        attributes = webGLAttributes;
    } else {
        RefPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
        attributes = canvas2DAttributes;
    }
    CanvasRenderingContext* result = impl->getContext(contextId, attributes.get());
    if (!result) {
        v8SetReturnValueNull(info);
        return;
    }
    if (result->is2d()) {
        v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
        v8SetReturnValue(info, v8Result);
        return;
    }
    if (result->is3d()) {
        v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
        v8SetReturnValue(info, v8Result);
        return;
    }
    ASSERT_NOT_REACHED();
    v8SetReturnValueNull(info);
}
Example #5
0
String HTMLCanvasElement::toDataURLInternal(const String& mimeType, const double* quality, bool isSaving) const
{
    if (m_size.isEmpty() || !buffer())
        return String("data:,");

    String encodingMimeType = toEncodingMimeType(mimeType);

    // Try to get ImageData first, as that may avoid lossy conversions.
    RefPtr<ImageData> imageData = getImageData();

    if (imageData)
        return ImageDataToDataURL(ImageDataBuffer(imageData->size(), imageData->data()), encodingMimeType, quality);

    if (m_context && m_context->is3d()) {
        toWebGLRenderingContext(m_context.get())->setSavingImage(isSaving);
        m_context->paintRenderingResultsToCanvas();
        toWebGLRenderingContext(m_context.get())->setSavingImage(false);
    }

    return buffer()->toDataURL(encodingMimeType, quality);
}
Example #6
0
PassRefPtr<ImageData> HTMLCanvasElement::getImageData() const
{
    if (!m_context || !m_context->is3d())
        return nullptr;
    return toWebGLRenderingContext(m_context.get())->paintRenderingResultsToImageData();
}