gistfile1.cpp

namespace WebCore {

namespace{

inline LayoutSize frameToMainFrameOffset(Frame* frame)
{
    LayoutPoint mainFramePoint = frame->page()->mainFrame()->view()->rootViewToContents(frame->view()->contentsToRootView(LayoutPoint()));
    return toLayoutSize(mainFramePoint);
}

} // anonymous namespace

namespace GestureTapHighlighter {

void drawHighlight(GraphicsContext* context, Node* node, const Color& color)
{
    RenderObject* renderer = node->renderer();
    Frame* containingFrame = node->document()->frame();

    if (!renderer || !containingFrame || !context)
        return;

    LayoutSize mainFrameOffset = frameToMainFrameOffset(containingFrame);

    // Don't translate the context if the frame is rendered in page coordinates.
    FrameView* view = containingFrame->page()->mainFrame()->view();
    if (!view->delegatesScrolling()) {
        FloatRect visibleRect = view->visibleContentRect();
        context->translate(-visibleRect.x(), -visibleRect.y());
    }

    if (renderer->isBox() || renderer->isRenderInline()) {
        LayoutRect contentBox;
        LayoutRect paddingBox;
        LayoutRect borderBox;

        if (renderer->isBox()) {
            RenderBox* renderBox = toRenderBox(renderer);
            contentBox = renderBox->contentBoxRect();
            paddingBox = LayoutRect(contentBox.x() - renderBox->paddingLeft(), contentBox.y() - renderBox->paddingTop(),
                    contentBox.width() + renderBox->paddingLeft() + renderBox->paddingRight(), contentBox.height() + renderBox->paddingTop() + renderBox->paddingBottom());
            borderBox = LayoutRect(paddingBox.x() - renderBox->borderLeft(), paddingBox.y() - renderBox->borderTop(),
                    paddingBox.width() + renderBox->borderLeft() + renderBox->borderRight(), paddingBox.height() + renderBox->borderTop() + renderBox->borderBottom());
        } else {
            RenderInline* renderInline = toRenderInline(renderer);
            // RenderInline's bounding box includes paddings and borders, excludes margins.
            borderBox = renderInline->linesBoundingBox();
        }

        RoundedRect rect(borderBox);
        rect.expandRadii(10);
        rect.inflateWithRadii(5);

        if (!renderer->hasLayer())
            return;

        LayoutSize containerOffset = renderer->offsetFromAncestorContainer(renderer);
        TransformationMatrix t;
        renderer->getTransformFromContainer(renderer, containerOffset, t);
        AffineTransform trans = t.toAffineTransform();

        rect.move(mainFrameOffset);

        context->concatCTM(trans);
        context->fillRoundedRect(rect, color, ColorSpaceDeviceRGB);
    }
}

} // namespace GestureTapHighlighter

} // namespace WebCore