C++ FrameView::hasCompositedContent方法代码示例

void RenderWidget::paintContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    LayoutPoint adjustedPaintOffset = paintOffset + location();

    // Tell the widget to paint now. This is the only time the widget is allowed
    // to paint itself. That way it will composite properly with z-indexed layers.
    IntPoint widgetLocation = m_widget->frameRect().location();
    IntPoint paintLocation(roundToInt(adjustedPaintOffset.x() + borderLeft() + paddingLeft()),
        roundToInt(adjustedPaintOffset.y() + borderTop() + paddingTop()));
    IntRect paintRect = paintInfo.rect;

    IntSize widgetPaintOffset = paintLocation - widgetLocation;
    // When painting widgets into compositing layers, tx and ty are relative to the enclosing compositing layer,
    // not the root. In this case, shift the CTM and adjust the paintRect to be root-relative to fix plug-in drawing.
    if (!widgetPaintOffset.isZero()) {
        paintInfo.context->translate(widgetPaintOffset);
        paintRect.move(-widgetPaintOffset);
    }
    m_widget->paint(paintInfo.context, paintRect);

    if (!widgetPaintOffset.isZero())
        paintInfo.context->translate(-widgetPaintOffset);

    if (m_widget->isFrameView()) {
        FrameView* frameView = toFrameView(m_widget.get());
        bool runOverlapTests = !frameView->useSlowRepaintsIfNotOverlapped() || frameView->hasCompositedContent();
        if (paintInfo.overlapTestRequests && runOverlapTests) {
            ASSERT(!paintInfo.overlapTestRequests->contains(this));
            paintInfo.overlapTestRequests->set(this, m_widget->frameRect());
        }
    }
}

void RenderWidget::paint(PaintInfo& paintInfo, int tx, int ty)
{
    if (!shouldPaint(paintInfo, tx, ty))
        return;

    tx += x();
    ty += y();

    if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection))
        paintBoxDecorations(paintInfo, tx, ty);

    if (paintInfo.phase == PaintPhaseMask) {
        paintMask(paintInfo, tx, ty);
        return;
    }

    if (!m_frameView || paintInfo.phase != PaintPhaseForeground || style()->visibility() != VISIBLE)
        return;

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

    if (style()->hasBorderRadius()) {
        IntRect borderRect = IntRect(tx, ty, width(), height());

        if (borderRect.isEmpty())
            return;

        // Push a clip if we have a border radius, since we want to round the foreground content that gets painted.
        paintInfo.context->save();
        
        IntSize topLeft, topRight, bottomLeft, bottomRight;
        style()->getBorderRadiiForRect(borderRect, topLeft, topRight, bottomLeft, bottomRight);

        paintInfo.context->addRoundedRectClip(borderRect, topLeft, topRight, bottomLeft, bottomRight);
    }

    if (m_widget) {
        // Tell the widget to paint now.  This is the only time the widget is allowed
        // to paint itself.  That way it will composite properly with z-indexed layers.
        if (m_substituteImage)
            paintInfo.context->drawImage(m_substituteImage.get(), style()->colorSpace(), m_widget->frameRect());
        else {
            IntPoint widgetLocation = m_widget->frameRect().location();
            IntPoint paintLocation(tx + borderLeft() + paddingLeft(), ty + borderTop() + paddingTop());
            IntRect paintRect = paintInfo.rect;

            IntSize paintOffset = paintLocation - widgetLocation;
            // When painting widgets into compositing layers, tx and ty are relative to the enclosing compositing layer,
            // not the root. In this case, shift the CTM and adjust the paintRect to be root-relative to fix plug-in drawing.
            if (!paintOffset.isZero()) {
                paintInfo.context->translate(paintOffset);
                paintRect.move(-paintOffset);
            }
            m_widget->paint(paintInfo.context, paintRect);

            if (!paintOffset.isZero())
                paintInfo.context->translate(-paintOffset);
        }

        if (m_widget->isFrameView()) {
            FrameView* frameView = static_cast<FrameView*>(m_widget.get());
            bool runOverlapTests = !frameView->useSlowRepaintsIfNotOverlapped() || frameView->hasCompositedContent();
            if (paintInfo.overlapTestRequests && runOverlapTests) {
                ASSERT(!paintInfo.overlapTestRequests->contains(this));
                paintInfo.overlapTestRequests->set(this, m_widget->frameRect());
            }
         }
    }

    if (style()->hasBorderRadius())
        paintInfo.context->restore();

    // Paint a partially transparent wash over selected widgets.
    if (isSelected() && !document()->printing()) {
        // FIXME: selectionRect() is in absolute, not painting coordinates.
        paintInfo.context->fillRect(selectionRect(), selectionBackgroundColor(), style()->colorSpace());
    }
}