C++ LayoutRect::intersect方法代码示例

LayoutRect SVGRenderSupport::clippedOverflowRectForPaintInvalidation(const RenderObject* object, const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
{
    // Return early for any cases where we don't actually paint
    if (object->style()->visibility() != VISIBLE && !object->enclosingLayer()->hasVisibleContent())
        return LayoutRect();

    // Pass our local paint rect to computeRectForPaintInvalidation() which will
    // map to parent coords and recurse up the parent chain.
    FloatRect paintInvalidationRect = object->paintInvalidationRectInLocalCoordinates();
    paintInvalidationRect.inflate(object->style()->outlineWidth());

    if (paintInvalidationState && paintInvalidationState->canMapToContainer(paintInvalidationContainer)) {
        // Compute accumulated SVG transform and apply to local paint rect.
        AffineTransform transform = paintInvalidationState->svgTransform() * object->localToParentTransform();
        paintInvalidationRect = transform.mapRect(paintInvalidationRect);
        // FIXME: These are quirks carried forward from the old paint invalidation infrastructure.
        LayoutRect rect = enclosingIntRectIfNotEmpty(paintInvalidationRect);
        // Offset by SVG root paint offset and apply clipping as needed.
        rect.move(paintInvalidationState->paintOffset());
        if (paintInvalidationState->isClipped())
            rect.intersect(paintInvalidationState->clipRect());
        return rect;
    }

    LayoutRect rect;
    const RenderSVGRoot& svgRoot = mapRectToSVGRootForPaintInvalidation(object, paintInvalidationRect, rect);
    svgRoot.mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, paintInvalidationState);
    return rect;
}

LayoutRect RenderRegion::rectFlowPortionForBox(const RenderBox* box, const LayoutRect& rect) const
{
    RenderRegion* startRegion = 0;
    RenderRegion* endRegion = 0;
    m_flowThread->getRegionRangeForBox(box, startRegion, endRegion);

    LayoutRect mappedRect = m_flowThread->mapFromLocalToFlowThread(box, rect);
    if (flowThread()->isHorizontalWritingMode()) {
        if (this != startRegion)
            mappedRect.shiftYEdgeTo(std::max<LayoutUnit>(logicalTopForFlowThreadContent(), mappedRect.y()));

        if (this != endRegion)
            mappedRect.setHeight(std::max<LayoutUnit>(0, std::min<LayoutUnit>(logicalBottomForFlowThreadContent() - mappedRect.y(), mappedRect.height())));
    } else {
        if (this != startRegion)
            mappedRect.shiftXEdgeTo(std::max<LayoutUnit>(logicalTopForFlowThreadContent(), mappedRect.x()));
            
        if (this != endRegion)
            mappedRect.setWidth(std::max<LayoutUnit>(0, std::min<LayoutUnit>(logicalBottomForFlowThreadContent() - mappedRect.x(), mappedRect.width())));
    }

    bool isLastRegionWithRegionFragmentBreak = (isLastRegion() && (style().regionFragment() == BreakRegionFragment));
    if (hasOverflowClip() || isLastRegionWithRegionFragmentBreak)
        mappedRect.intersect(flowThreadPortionRect());

    return mappedRect.isEmpty() ? mappedRect : m_flowThread->mapFromFlowThreadToLocal(box, mappedRect);
}

void RenderBlockFlow::invalidatePaintForOverflow()
{
    // FIXME: We could tighten up the left and right invalidation points if we let layoutInlineChildren fill them in based off the particular lines
    // it had to lay out. We wouldn't need the hasOverflowClip() hack in that case either.
    LayoutUnit paintInvalidationLogicalLeft = logicalLeftVisualOverflow();
    LayoutUnit paintInvalidationLogicalRight = logicalRightVisualOverflow();
    if (hasOverflowClip()) {
        // If we have clipped overflow, we should use layout overflow as well, since visual overflow from lines didn't propagate to our block's overflow.
        // Note the old code did this as well but even for overflow:visible. The addition of hasOverflowClip() at least tightens up the hack a bit.
        // layoutInlineChildren should be patched to compute the entire paint invalidation rect.
        paintInvalidationLogicalLeft = std::min(paintInvalidationLogicalLeft, logicalLeftLayoutOverflow());
        paintInvalidationLogicalRight = std::max(paintInvalidationLogicalRight, logicalRightLayoutOverflow());
    }

    LayoutRect paintInvalidationRect = LayoutRect(paintInvalidationLogicalLeft, m_paintInvalidationLogicalTop, paintInvalidationLogicalRight - paintInvalidationLogicalLeft, m_paintInvalidationLogicalBottom - m_paintInvalidationLogicalTop);

    if (hasOverflowClip()) {
        // Adjust the paint invalidation rect for scroll offset
        paintInvalidationRect.move(-scrolledContentOffset());

        // Don't allow this rect to spill out of our overflow box.
        paintInvalidationRect.intersect(LayoutRect(LayoutPoint(), size()));
    }

    // Make sure the rect is still non-empty after intersecting for overflow above
    if (!paintInvalidationRect.isEmpty()) {
        // Hits in media/event-attributes.html
        DisableCompositingQueryAsserts disabler;

        invalidatePaintRectangle(paintInvalidationRect); // We need to do a partial paint invalidation of our content.
    }

    m_paintInvalidationLogicalTop = 0;
    m_paintInvalidationLogicalBottom = 0;
}

LayoutRect RenderRegion::rectFlowPortionForBox(const RenderBox* box, const LayoutRect& rect) const
{
    RenderRegion* startRegion = 0;
    RenderRegion* endRegion = 0;
    m_flowThread->getRegionRangeForBox(box, startRegion, endRegion);

    LayoutRect mappedRect = m_flowThread->mapFromLocalToFlowThread(box, rect);
    if (flowThread()->isHorizontalWritingMode()) {
        if (this != startRegion)
            mappedRect.shiftYEdgeTo(std::max<LayoutUnit>(logicalTopForFlowThreadContent(), mappedRect.y()));

        if (this != endRegion)
            mappedRect.setHeight(std::max<LayoutUnit>(0, std::min<LayoutUnit>(logicalBottomForFlowThreadContent() - mappedRect.y(), mappedRect.height())));
    } else {
        if (this != startRegion)
            mappedRect.shiftXEdgeTo(std::max<LayoutUnit>(logicalTopForFlowThreadContent(), mappedRect.x()));
            
        if (this != endRegion)
            mappedRect.setWidth(std::max<LayoutUnit>(0, std::min<LayoutUnit>(logicalBottomForFlowThreadContent() - mappedRect.x(), mappedRect.width())));
    }

    if (shouldClipFlowThreadContent()) {
        LayoutRect portionRect;
        if (isRenderNamedFlowFragment())
            portionRect = toRenderNamedFlowFragment(this)->flowThreadPortionRectForClipping(this == startRegion, this == endRegion);
        else
            portionRect = flowThreadPortionRect();
        
        mappedRect.intersect(portionRect);
    }

    return mappedRect.isEmpty() ? mappedRect : m_flowThread->mapFromFlowThreadToLocal(box, mappedRect);
}

bool SVGLayoutSupport::mapToVisualRectInAncestorSpace(
    const LayoutObject& object,
    const LayoutBoxModelObject* ancestor,
    const FloatRect& localPaintInvalidationRect,
    LayoutRect& resultRect,
    VisualRectFlags visualRectFlags) {
  AffineTransform rootBorderBoxTransform;
  const LayoutSVGRoot& svgRoot =
      computeTransformToSVGRoot(object, rootBorderBoxTransform);
  resultRect = transformPaintInvalidationRect(object, rootBorderBoxTransform,
                                              localPaintInvalidationRect);

  // Apply initial viewport clip.
  if (svgRoot.shouldApplyViewportClip()) {
    LayoutRect clipRect(svgRoot.overflowClipRect(LayoutPoint()));
    if (visualRectFlags & EdgeInclusive) {
      if (!resultRect.inclusiveIntersect(clipRect))
        return false;
    } else {
      resultRect.intersect(clipRect);
    }
  }
  return svgRoot.mapToVisualRectInAncestorSpace(ancestor, resultRect,
                                                visualRectFlags);
}

void RenderImage::repaintOrMarkForLayout(bool imageSizeChangedToAccomodateAltText, const IntRect* rect)
{
    LayoutSize oldIntrinsicSize = intrinsicSize();
    LayoutSize newIntrinsicSize = m_imageResource->intrinsicSize(style()->effectiveZoom());
    updateIntrinsicSizeIfNeeded(newIntrinsicSize);

    // In the case of generated image content using :before/:after/content, we might not be
    // in the render tree yet. In that case, we just need to update our intrinsic size.
    // layout() will be called after we are inserted in the tree which will take care of
    // what we are doing here.
    if (!containingBlock())
        return;

    bool imageSourceHasChangedSize = oldIntrinsicSize != newIntrinsicSize || imageSizeChangedToAccomodateAltText;
    if (imageSourceHasChangedSize)
        setPreferredLogicalWidthsDirty();

    // If the actual area occupied by the image has changed and it is not constrained by style then a layout is required.
    bool imageSizeIsConstrained = style()->logicalWidth().isSpecified() && style()->logicalHeight().isSpecified();
    bool needsLayout = !imageSizeIsConstrained && imageSourceHasChangedSize;

    // FIXME: We only need to recompute the containing block's preferred size if the containing block's size
    // depends on the image's size (i.e., the container uses shrink-to-fit sizing).
    // There's no easy way to detect that shrink-to-fit is needed, always force a layout.
    bool containingBlockNeedsToRecomputePreferredSize =  style()->logicalWidth().isPercent() || style()->logicalMaxWidth().isPercent()  || style()->logicalMinWidth().isPercent();

    if (needsLayout || containingBlockNeedsToRecomputePreferredSize) {
        setNeedsLayout();
        return;
    }

    // The image hasn't changed in size or its style constrains its size, so a repaint will suffice.
    if (everHadLayout() && !selfNeedsLayout()) {
        // The inner content rectangle is calculated during layout, but may need an update now
        // (unless the box has already been scheduled for layout). In order to calculate it, we
        // may need values from the containing block, though, so make sure that we're not too
        // early. It may be that layout hasn't even taken place once yet.
        updateInnerContentRect();
    }

    LayoutRect repaintRect;
    if (rect) {
        // The image changed rect is in source image coordinates (pre-zooming),
        // so map from the bounds of the image to the contentsBox.
        repaintRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize(1.0f)), contentBoxRect()));
        // Guard against too-large changed rects.
        repaintRect.intersect(contentBoxRect());
    } else {
        repaintRect = contentBoxRect();
    }

    {
        // FIXME: We should not be allowing repaint during layout. crbug.com/339584
        AllowRepaintScope scoper(frameView());
        repaintRectangle(repaintRect);
    }

    // Tell any potential compositing layers that the image needs updating.
    contentChanged(ImageChanged);
}

bool LayoutImage::updateImageLoadingPriorities()
{
    if (!m_imageResource || !m_imageResource->cachedImage() || m_imageResource->cachedImage()->isLoaded())
        return false;

    LayoutRect viewBounds = viewRect();
    LayoutRect objectBounds = LayoutRect(absoluteContentBox());

    // The object bounds might be empty right now, so intersects will fail since it doesn't deal
    // with empty rects. Use LayoutRect::contains in that case.
    bool isVisible;
    if (!objectBounds.isEmpty())
        isVisible =  viewBounds.intersects(objectBounds);
    else
        isVisible = viewBounds.contains(objectBounds);

    ResourceLoadPriorityOptimizer::VisibilityStatus status = isVisible ?
        ResourceLoadPriorityOptimizer::Visible : ResourceLoadPriorityOptimizer::NotVisible;

    LayoutRect screenArea;
    if (!objectBounds.isEmpty()) {
        screenArea = viewBounds;
        screenArea.intersect(objectBounds);
    }

    ResourceLoadPriorityOptimizer::resourceLoadPriorityOptimizer()->notifyImageResourceVisibility(m_imageResource->cachedImage(), status, screenArea);

    return true;
}

void RenderImage::imageDimensionsChanged(bool imageSizeChanged, const IntRect* rect)
{
    bool intrinsicSizeChanged = updateIntrinsicSizeIfNeeded(m_imageResource->imageSize(style()->effectiveZoom()), imageSizeChanged);

    // In the case of generated image content using :before/:after/content, we might not be
    // in the render tree yet. In that case, we just need to update our intrinsic size.
    // layout() will be called after we are inserted in the tree which will take care of
    // what we are doing here.
    if (!containingBlock())
        return;

    bool shouldRepaint = true;
    if (intrinsicSizeChanged) {
        if (!preferredLogicalWidthsDirty())
            setPreferredLogicalWidthsDirty(true);

        bool hasOverrideSize = hasOverrideHeight() || hasOverrideWidth();
        if (!hasOverrideSize && !imageSizeChanged) {
            LogicalExtentComputedValues computedValues;
            computeLogicalWidthInRegion(computedValues);
            LayoutUnit newWidth = computedValues.m_extent;
            computeLogicalHeight(height(), 0, computedValues);
            LayoutUnit newHeight = computedValues.m_extent;

            imageSizeChanged = width() != newWidth || height() != newHeight;
        }

        // FIXME: We only need to recompute the containing block's preferred size
        // if the containing block's size depends on the image's size (i.e., the container uses shrink-to-fit sizing).
        // There's no easy way to detect that shrink-to-fit is needed, always force a layout.
        bool containingBlockNeedsToRecomputePreferredSize =
            style()->logicalWidth().isPercent()
            || style()->logicalMaxWidth().isPercent()
            || style()->logicalMinWidth().isPercent();

        if (imageSizeChanged || hasOverrideSize || containingBlockNeedsToRecomputePreferredSize) {
            shouldRepaint = false;
            if (!selfNeedsLayout())
                setNeedsLayout();
        }
    }

    if (shouldRepaint) {
        LayoutRect repaintRect;
        if (rect) {
            // The image changed rect is in source image coordinates (pre-zooming),
            // so map from the bounds of the image to the contentsBox.
            repaintRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize(1.0f)), contentBoxRect()));
            // Guard against too-large changed rects.
            repaintRect.intersect(contentBoxRect());
        } else
            repaintRect = contentBoxRect();

        repaintRectangle(repaintRect);

        // Tell any potential compositing layers that the image needs updating.
        contentChanged(ImageChanged);
    }
}

BoxClipper::BoxClipper(const LayoutBox& box, const PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset, ContentsClipBehavior contentsClipBehavior)
    : m_box(box)
    , m_paintInfo(paintInfo)
    , m_clipType(DisplayItem::UninitializedType)
{
    ASSERT(m_paintInfo.phase != PaintPhaseSelfBlockBackgroundOnly && m_paintInfo.phase != PaintPhaseSelfOutlineOnly);

    if (m_paintInfo.phase == PaintPhaseMask)
        return;

    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
        const auto* objectProperties = m_box.objectPaintProperties();
        if (objectProperties && objectProperties->overflowClip()) {
            PaintChunkProperties properties(paintInfo.context.getPaintController().currentPaintChunkProperties());
            properties.clip = objectProperties->overflowClip();
            m_scopedClipProperty.emplace(paintInfo.context.getPaintController(), properties);
        }
        return;
    }

    bool isControlClip = m_box.hasControlClip();
    bool isOverflowOrContainmentClip = (m_box.hasOverflowClip() && !m_box.layer()->isSelfPaintingLayer())
        || m_box.style()->containsPaint();

    if (!isControlClip && !isOverflowOrContainmentClip)
        return;

    LayoutRect clipRect = isControlClip ? m_box.controlClipRect(accumulatedOffset) : m_box.overflowClipRect(accumulatedOffset);
    FloatRoundedRect clipRoundedRect(0, 0, 0, 0);
    bool hasBorderRadius = m_box.style()->hasBorderRadius();
    if (hasBorderRadius)
        clipRoundedRect = m_box.style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, m_box.size()));

    // Selection does not affect visual overflow, so this optimization is invalid if selection
    // is present.
    if (contentsClipBehavior == SkipContentsClipIfPossible && box.getSelectionState() == SelectionNone) {
        LayoutRect contentsVisualOverflow = m_box.contentsVisualOverflowRect();
        if (contentsVisualOverflow.isEmpty())
            return;

        LayoutRect conservativeClipRect = clipRect;
        if (hasBorderRadius)
            conservativeClipRect.intersect(LayoutRect(clipRoundedRect.radiusCenterRect()));
        conservativeClipRect.moveBy(-accumulatedOffset);
        if (m_box.hasLayer())
            conservativeClipRect.move(m_box.scrolledContentOffset());
        if (conservativeClipRect.contains(contentsVisualOverflow))
            return;
    }

    if (!m_paintInfo.context.getPaintController().displayItemConstructionIsDisabled()) {
        m_clipType = m_paintInfo.displayItemTypeForClipping();
        Vector<FloatRoundedRect> roundedRects;
        if (hasBorderRadius)
            roundedRects.append(clipRoundedRect);
        m_paintInfo.context.getPaintController().createAndAppend<ClipDisplayItem>(m_box, m_clipType, pixelSnappedIntRect(clipRect), roundedRects);
    }
}

void RenderImage::paintInvalidationOrMarkForLayout(const IntRect* rect)
{
    ASSERT(isRooted());

    LayoutSize oldIntrinsicSize = intrinsicSize();
    LayoutSize newIntrinsicSize = m_imageResource->intrinsicSize();
    updateIntrinsicSizeIfNeeded(newIntrinsicSize);

    bool imageSourceHasChangedSize = oldIntrinsicSize != newIntrinsicSize;
    if (imageSourceHasChangedSize)
        setPreferredLogicalWidthsDirty();

    // If the actual area occupied by the image has changed and it is not constrained by style then a layout is required.
    bool imageSizeIsConstrained = style()->logicalWidth().isSpecified() && style()->logicalHeight().isSpecified();

    // FIXME: We only need to recompute the containing block's preferred size if the containing block's size
    // depends on the image's size (i.e., the container uses shrink-to-fit sizing).
    // There's no easy way to detect that shrink-to-fit is needed, always force a layout.
    bool containingBlockNeedsToRecomputePreferredSize = style()->logicalWidth().isPercent() || style()->logicalMaxWidth().isPercent()  || style()->logicalMinWidth().isPercent();

    if (imageSourceHasChangedSize && (!imageSizeIsConstrained || containingBlockNeedsToRecomputePreferredSize)) {
        setNeedsLayoutAndFullPaintInvalidation();
        return;
    }

    // The image hasn't changed in size or its style constrains its size, so a paint invalidation will suffice.
    if (everHadLayout() && !selfNeedsLayout()) {
        // The inner content rectangle is calculated during layout, but may need an update now
        // (unless the box has already been scheduled for layout). In order to calculate it, we
        // may need values from the containing block, though, so make sure that we're not too
        // early. It may be that layout hasn't even taken place once yet.
        updateInnerContentRect();
    }

    LayoutRect paintInvalidationRect;
    if (rect) {
        // The image changed rect is in source image coordinates,
        // so map from the bounds of the image to the contentsBox.
        paintInvalidationRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize()), contentBoxRect()));
        // Guard against too-large changed rects.
        paintInvalidationRect.intersect(contentBoxRect());
    } else {
        paintInvalidationRect = contentBoxRect();
    }

    {
        // FIXME: We should not be allowing paint invalidations during layout. crbug.com/339584
        AllowPaintInvalidationScope scoper(frameView());
        DisableCompositingQueryAsserts disabler;
        invalidatePaintRectangle(paintInvalidationRect);
    }

    // Tell any potential compositing layers that the image needs updating.
    contentChanged(ImageChanged);
}

void LayoutSVGRoot::mapToVisibleRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect& rect, const PaintInvalidationState* paintInvalidationState) const
{
    // Note that we don't apply the border-box transform here - it's assumed
    // that whoever called us has done that already.

    // Apply initial viewport clip
    if (shouldApplyViewportClip())
        rect.intersect(LayoutRect(pixelSnappedBorderBoxRect()));

    LayoutReplaced::mapToVisibleRectInAncestorSpace(ancestor, rect, paintInvalidationState);
}

LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
{
    // The result of this function is the area in the "filterBoxRect" that needs to be repainted, so that we fully cover the "dirtyRect".
    LayoutRect rectForRepaint = dirtyRect;
    if (hasFilterThatMovesPixels()) {
        // Note that the outsets are reversed here because we are going backwards -> we have the dirty rect and
        // need to find out what is the rectangle that might influence the result inside that dirty rect.
        rectForRepaint.move(-m_outsets.right(), -m_outsets.bottom());
        rectForRepaint.expand(m_outsets.left() + m_outsets.right(), m_outsets.top() + m_outsets.bottom());
    }
    rectForRepaint.intersect(filterBoxRect);
    return rectForRepaint;
}

void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, LayoutRect& repaintRect, bool fixed) const
{
    // Apply our local transforms (except for x/y translation), then our shadow, 
    // and then call RenderBox's method to handle all the normal CSS Box model bits
    repaintRect = localToBorderBoxTransform().mapRect(repaintRect);

    // Apply initial viewport clip - not affected by overflow settings    
    repaintRect.intersect(enclosingLayoutRect(FloatRect(FloatPoint(), m_viewportSize)));

    const SVGRenderStyle* svgStyle = style()->svgStyle();
    if (const ShadowData* shadow = svgStyle->shadow())
        shadow->adjustRectForShadow(repaintRect);

    RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
}

void RenderImage::imageDimensionsChanged(bool imageSizeChanged, const IntRect* rect)
{
    bool shouldRepaint = true;
    if (updateIntrinsicSizeIfNeeded(m_imageResource->imageSize(style()->effectiveZoom()), imageSizeChanged)) {
        // In the case of generated image content using :before/:after, we might not be in the
        // render tree yet.  In that case, we don't need to worry about check for layout, since we'll get a
        // layout when we get added in to the render tree hierarchy later.
        if (containingBlock()) {
            // lets see if we need to relayout at all..
            int oldwidth = width();
            int oldheight = height();
            if (!preferredLogicalWidthsDirty())
                setPreferredLogicalWidthsDirty(true);
            computeLogicalWidth();
            computeLogicalHeight();

            if (imageSizeChanged || width() != oldwidth || height() != oldheight) {
                shouldRepaint = false;
                if (!selfNeedsLayout())
                    setNeedsLayout(true);
            }

            setWidth(oldwidth);
            setHeight(oldheight);
        }
    }

    if (shouldRepaint) {
        LayoutRect repaintRect;
        if (rect) {
            // The image changed rect is in source image coordinates (pre-zooming),
            // so map from the bounds of the image to the contentsBox.
            repaintRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize(1.0f)), contentBoxRect()));
            // Guard against too-large changed rects.
            repaintRect.intersect(contentBoxRect());
        } else
            repaintRect = contentBoxRect();
        
        repaintRectangle(repaintRect);

#if USE(ACCELERATED_COMPOSITING)
        if (hasLayer()) {
            // Tell any potential compositing layers that the image needs updating.
            layer()->contentChanged(RenderLayer::ImageChanged);
        }
#endif
    }
}

void IntersectionObservation::clipToRoot(LayoutRect& rect)
{
    // Map and clip rect into root element coordinates.
    // TODO(szager): the writing mode flipping needs a test.
    ASSERT(m_target);
    LayoutObject* rootLayoutObject = m_observer->rootLayoutObject();
    LayoutObject* targetLayoutObject = target()->layoutObject();
    targetLayoutObject->mapToVisibleRectInAncestorSpace(toLayoutBoxModelObject(rootLayoutObject), rect, nullptr);
    if (rootLayoutObject->hasOverflowClip()) {
        LayoutBox* rootLayoutBox = toLayoutBox(rootLayoutObject);
        LayoutRect clipRect(LayoutPoint(), LayoutSize(rootLayoutBox->layer()->size()));
        m_observer->applyRootMargin(clipRect);
        rootLayoutBox->flipForWritingMode(rect);
        rect.intersect(clipRect);
        rootLayoutBox->flipForWritingMode(rect);
    }
}