C++ (Cpp) hasImageBuffer Examples

Example #1

GraphicsContext* HTMLCanvasElement::existingDrawingContext() const
{
    if (!hasImageBuffer())
        return 0;

    return drawingContext();
}

Example #2

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

File: CanvasRenderingContext2D.cpp Project: ollie314/chromium

PassRefPtr<Image> blink::CanvasRenderingContext2D::getImage(
    AccelerationHint hint,
    SnapshotReason reason) const {
  if (!hasImageBuffer())
    return nullptr;
  return canvas()->buffer()->newImageSnapshot(hint, reason);
}

Example #4

File: HTMLCanvasElement.cpp Project: 335969568/Blink-1

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);
}

Example #5

void HTMLCanvasElement::ensureUnacceleratedImageBuffer()
{
    if ((hasImageBuffer() && !m_imageBuffer->isAccelerated()) || m_didFailToCreateImageBuffer)
        return;
    discardImageBuffer();
    OpacityMode opacityMode = !m_context || m_context->hasAlpha() ? NonOpaque : Opaque;
    m_imageBuffer = ImageBuffer::create(size(), opacityMode);
    m_didFailToCreateImageBuffer = !m_imageBuffer;
}

Example #6

File: HTMLCanvasElement.cpp Project: 335969568/Blink-1

void HTMLCanvasElement::didProcessTask()
{
    // This method gets invoked if didDraw was called earlier in the current task.
    ASSERT(!m_dirtyRect.isEmpty());
    if (is3D()) {
        didFinalizeFrame();
    } else {
        ASSERT(hasImageBuffer());
        m_imageBuffer->finalizeFrame(m_dirtyRect);
    }
    ASSERT(m_dirtyRect.isEmpty());
}

Example #7

void HTMLCanvasElement::clearImageBuffer()
{
    ASSERT(hasImageBuffer() && !m_didFailToCreateImageBuffer);
    ASSERT(!m_didClearImageBuffer);
    ASSERT(m_context);

    m_didClearImageBuffer = true;

    if (m_context->is2d()) {
        // No need to undo transforms/clip/etc. because we are called right
        // after the context is reset.
        toCanvasRenderingContext2D(m_context.get())->clearRect(0, 0, width(), height());
    }
}

Example #8

AffineTransform HTMLCanvasElement::baseTransform() const
{
    ASSERT(hasImageBuffer() && !m_didFailToCreateImageBuffer);
    return m_imageBuffer->baseTransform();
}

Example #9

ImageBuffer* HTMLCanvasElement::buffer() const
{
    if (!hasImageBuffer() && !m_didFailToCreateImageBuffer)
        const_cast<HTMLCanvasElement*>(this)->createImageBuffer();
    return m_imageBuffer.get();
}