C++ HTMLImageElement::compositeOperator方法代码示例

void RenderImage::readyWRATHWidgetIntoRect(PaintedWidgetsOfWRATHHandle& handle,
        ContextOfWRATH *wrath_context, const IntRect& rect)
{
    RenderImage_ReadyWRATHWidgetIntoRect *d(RenderImage_ReadyWRATHWidgetIntoRect::object(this, handle));
    ContextOfWRATH::AutoPushNode autoPushRoot(wrath_context, d->m_root_node);

    d->m_image.visible(false);

    if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || rect.width() <= 0 || rect.height() <= 0) {
        return;
    }

    RefPtr<Image> img = m_imageResource->image(rect.width(), rect.height());
    if (!img || img->isNull()) {
        return;
    }

    HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    Image* image = m_imageResource->image().get();
    /*
    bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, rect.size());
    [WRATH-TODO]: What to do with the above function call?
    */

    /*
    context->drawImage(m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
    */

    d->m_image.visible(true);
    WRATH_drawImage(d->m_image, wrath_context,
                    m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, false /*useLowQualityScaling*/);

}

void RenderImage::paintIntoRect(GraphicsContext* context, const IntRect& rect)
{
    if (!hasImage() || errorOccurred() || rect.width() <= 0 || rect.height() <= 0)
        return;

    Image* img = image(rect.width(), rect.height());
    if (!img || img->isNull())
        return;

    HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    bool useLowQualityScaling = RenderImageScaleObserver::shouldImagePaintAtLowQuality(this, rect.size());
    context->drawImage(image(rect.width(), rect.height()), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
}

void RenderImage::paintIntoRect(GraphicsContext* context, const IntRect& rect)
{
    if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || rect.width() <= 0 || rect.height() <= 0)
        return;

    RefPtr<Image> img = m_imageResource->image(rect.width(), rect.height());
    if (!img || img->isNull())
        return;

    HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    Image* image = m_imageResource->image().get();
    bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, rect.size());
    context->drawImage(m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
}

void RenderImage::paintIntoRect(GraphicsContext& context, const FloatRect& rect)
{
    if (!imageResource().hasImage() || imageResource().errorOccurred() || rect.width() <= 0 || rect.height() <= 0)
        return;

    RefPtr<Image> img = imageResource().image(rect.width(), rect.height());
    if (!img || img->isNull())
        return;

    HTMLImageElement* imageElement = is<HTMLImageElement>(element()) ? downcast<HTMLImageElement>(element()) : nullptr;
    CompositeOperator compositeOperator = imageElement ? imageElement->compositeOperator() : CompositeSourceOver;
    Image* image = imageResource().image().get();
    bool useLowQualityScaling = image && shouldPaintAtLowQuality(context, *image, image, LayoutSize(rect.size()));
    ImageOrientationDescription orientationDescription(shouldRespectImageOrientation());
#if ENABLE(CSS_IMAGE_ORIENTATION)
    orientationDescription.setImageOrientationEnum(style().imageOrientation());
#endif
    context.drawImage(*img, style().colorSpace(), rect,
        ImagePaintingOptions(compositeOperator, BlendModeNormal, orientationDescription, useLowQualityScaling));
}

void RenderImage::paintIntoRect(GraphicsContext* context, const LayoutRect& rect)
{
    IntRect alignedRect = pixelSnappedIntRect(rect);
    if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
        return;

    RefPtr<Image> img = m_imageResource->image(alignedRect.width(), alignedRect.height());
    if (!img || img->isNull())
        return;

    HTMLImageElement* imageElt = isHTMLImageElement(node()) ? toHTMLImageElement(node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    Image* image = m_imageResource->image().get();
    InterpolationQuality interpolationQuality = chooseInterpolationQuality(context, image, image, alignedRect.size());

    InspectorInstrumentation::willPaintImage(this);
    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
    context->setImageInterpolationQuality(interpolationQuality);
    context->drawImage(m_imageResource->image(alignedRect.width(), alignedRect.height()).get(), alignedRect, compositeOperator, shouldRespectImageOrientation());
    context->setImageInterpolationQuality(previousInterpolationQuality);
    InspectorInstrumentation::didPaintImage(this);
}

void ImagePainter::paintIntoRect(GraphicsContext* context, const LayoutRect& rect)
{
    IntRect alignedRect = pixelSnappedIntRect(rect);
    if (!m_renderImage.imageResource()->hasImage() || m_renderImage.imageResource()->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
        return;

    RefPtr<Image> img = m_renderImage.imageResource()->image(alignedRect.width(), alignedRect.height());
    if (!img || img->isNull())
        return;

    HTMLImageElement* imageElt = isHTMLImageElement(m_renderImage.node()) ? toHTMLImageElement(m_renderImage.node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    Image* image = img.get();
    InterpolationQuality interpolationQuality = BoxPainter::chooseInterpolationQuality(m_renderImage, context, image, image, alignedRect.size());

    TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data", InspectorPaintImageEvent::data(m_renderImage));
    // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
    InspectorInstrumentation::willPaintImage(&m_renderImage);
    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
    context->setImageInterpolationQuality(interpolationQuality);
    context->drawImage(image, alignedRect, compositeOperator, m_renderImage.shouldRespectImageOrientation());
    context->setImageInterpolationQuality(previousInterpolationQuality);
    InspectorInstrumentation::didPaintImage(&m_renderImage);
}

void RenderImage::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
{
    int cWidth = contentWidth();
    int cHeight = contentHeight();
    int leftBorder = borderLeft();
    int topBorder = borderTop();
    int leftPad = paddingLeft();
    int topPad = paddingTop();

    if (document()->printing() && !view()->printImages())
        return;

    GraphicsContext* context = paintInfo.context;

    if (!hasImage() || errorOccurred()) {
        if (paintInfo.phase == PaintPhaseSelection)
            return;

        if (cWidth > 2 && cHeight > 2) {
            // Draw an outline rect where the image should be.
            context->setStrokeStyle(SolidStroke);
            context->setStrokeColor(Color::lightGray);
            context->setFillColor(Color::transparent);
            context->drawRect(IntRect(tx + leftBorder + leftPad, ty + topBorder + topPad, cWidth, cHeight));

            bool errorPictureDrawn = false;
            int imageX = 0;
            int imageY = 0;
            // When calculating the usable dimensions, exclude the pixels of
            // the ouline rect so the error image/alt text doesn't draw on it.
            int usableWidth = cWidth - 2;
            int usableHeight = cHeight - 2;

            if (errorOccurred() && !image()->isNull() && (usableWidth >= image()->width()) && (usableHeight >= image()->height())) {
                // Center the error image, accounting for border and padding.
                int centerX = (usableWidth - image()->width()) / 2;
                if (centerX < 0)
                    centerX = 0;
                int centerY = (usableHeight - image()->height()) / 2;
                if (centerY < 0)
                    centerY = 0;
                imageX = leftBorder + leftPad + centerX + 1;
                imageY = topBorder + topPad + centerY + 1;
                context->drawImage(image(), IntPoint(tx + imageX, ty + imageY));
                errorPictureDrawn = true;
            }

            if (!m_altText.isEmpty()) {
                String text = m_altText;
                text.replace('\\', backslashAsCurrencySymbol());
                context->setFont(style()->font());
                context->setFillColor(style()->color());
                int ax = tx + leftBorder + leftPad;
                int ay = ty + topBorder + topPad;
                const Font& font = style()->font();
                int ascent = font.ascent();

                // Only draw the alt text if it'll fit within the content box,
                // and only if it fits above the error image.
                TextRun textRun(text.characters(), text.length());
                int textWidth = font.width(textRun);
                if (errorPictureDrawn) {
                    if (usableWidth >= textWidth && font.height() <= imageY)
                        context->drawText(textRun, IntPoint(ax, ay + ascent));
                } else if (usableWidth >= textWidth && cHeight >= font.height())
                    context->drawText(textRun, IntPoint(ax, ay + ascent));
            }
        }
    } else if (hasImage() && cWidth > 0 && cHeight > 0) {
        Image* img = image(cWidth, cHeight);
        if (!img || img->isNull())
            return;

#if PLATFORM(MAC)
        if (style()->highlight() != nullAtom && !paintInfo.context->paintingDisabled())
            paintCustomHighlight(tx - m_x, ty - m_y, style()->highlight(), true);
#endif

        IntSize contentSize(cWidth, cHeight);
        bool useLowQualityScaling = RenderImageScaleObserver::shouldImagePaintAtLowQuality(this, contentSize);
        IntRect rect(IntPoint(tx + leftBorder + leftPad, ty + topBorder + topPad), contentSize);
        HTMLImageElement* imageElt = (element() && element()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(element()) : 0;
        CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
        context->drawImage(image(cWidth, cHeight), rect, compositeOperator, useLowQualityScaling);
    }
}