C++ LayoutRect::maxY方法代码示例

void RenderMathMLOperator::paint(PaintInfo& info, const LayoutPoint& paintOffset)
{
    RenderMathMLBlock::paint(info, paintOffset);

    if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground || style().visibility() != VISIBLE)
        return;

    if (!m_isStretched && !m_stretchyCharacter) {
        RenderMathMLBlock::paint(info, paintOffset);
        return;
    }

    GraphicsContextStateSaver stateSaver(*info.context);
    info.context->setFillColor(style().visitedDependentColor(CSSPropertyColor), style().colorSpace());

    ASSERT(m_stretchyCharacter->topGlyph);
    ASSERT(m_stretchyCharacter->bottomGlyph);

    // We are positioning the glyphs so that the edge of the tight glyph bounds line up exactly with the edges of our paint box.
    LayoutPoint operatorTopLeft = ceiledIntPoint(paintOffset + location());
    FloatRect topGlyphBounds = glyphBoundsForCharacter(m_stretchyCharacter->topGlyph);
    LayoutPoint topGlyphOrigin(operatorTopLeft.x(), operatorTopLeft.y() - topGlyphBounds.y());
    LayoutRect topGlyphPaintRect = paintCharacter(info, m_stretchyCharacter->topGlyph, topGlyphOrigin, TrimBottom);

    FloatRect bottomGlyphBounds = glyphBoundsForCharacter(m_stretchyCharacter->bottomGlyph);
    LayoutPoint bottomGlyphOrigin(operatorTopLeft.x(), operatorTopLeft.y() + offsetHeight() - (bottomGlyphBounds.height() + bottomGlyphBounds.y()));
    LayoutRect bottomGlyphPaintRect = paintCharacter(info, m_stretchyCharacter->bottomGlyph, bottomGlyphOrigin, TrimTop);

    if (m_stretchyCharacter->middleGlyph) {
        // Center the glyph origin between the start and end glyph paint extents. Then shift it half the paint height toward the bottom glyph.
        FloatRect middleGlyphBounds = glyphBoundsForCharacter(m_stretchyCharacter->middleGlyph);
        LayoutPoint middleGlyphOrigin(operatorTopLeft.x(), topGlyphOrigin.y());
        middleGlyphOrigin.moveBy(LayoutPoint(0, (bottomGlyphPaintRect.y() - topGlyphPaintRect.maxY()) / 2.0));
        middleGlyphOrigin.moveBy(LayoutPoint(0, middleGlyphBounds.height() / 2.0));

        LayoutRect middleGlyphPaintRect = paintCharacter(info, m_stretchyCharacter->middleGlyph, middleGlyphOrigin, TrimTopAndBottom);
        fillWithExtensionGlyph(info, topGlyphPaintRect.minXMaxYCorner(), middleGlyphPaintRect.minXMinYCorner());
        fillWithExtensionGlyph(info, middleGlyphPaintRect.minXMaxYCorner(), bottomGlyphPaintRect.minXMinYCorner());
    } else
        fillWithExtensionGlyph(info, topGlyphPaintRect.minXMaxYCorner(), bottomGlyphPaintRect.minXMinYCorner());
}

bool RenderReplaced::shouldPaint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline 
            && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseMask)
        return false;

    if (!paintInfo.shouldPaintWithinRoot(*this))
        return false;
        
    // if we're invisible or haven't received a layout yet, then just bail.
    if (style().visibility() != VISIBLE)
        return false;
    
    RenderNamedFlowFragment* namedFlowFragment = currentRenderNamedFlowFragment();
    // Check our region range to make sure we need to be painting in this region.
    if (namedFlowFragment && !namedFlowFragment->flowThread()->objectShouldFragmentInFlowRegion(this, namedFlowFragment))
        return false;

    LayoutPoint adjustedPaintOffset = paintOffset + location();

    // Early exit if the element touches the edges.
    LayoutUnit top = adjustedPaintOffset.y() + visualOverflowRect().y();
    LayoutUnit bottom = adjustedPaintOffset.y() + visualOverflowRect().maxY();
    if (isSelected() && m_inlineBoxWrapper) {
        const RootInlineBox& rootBox = m_inlineBoxWrapper->root();
        LayoutUnit selTop = paintOffset.y() + rootBox.selectionTop();
        LayoutUnit selBottom = paintOffset.y() + selTop + rootBox.selectionHeight();
        top = std::min(selTop, top);
        bottom = std::max(selBottom, bottom);
    }
    
    LayoutRect localRepaintRect = paintInfo.rect;
    adjustRectWithMaximumOutline(paintInfo.phase, localRepaintRect);
    if (adjustedPaintOffset.x() + visualOverflowRect().x() >= localRepaintRect.maxX() || adjustedPaintOffset.x() + visualOverflowRect().maxX() <= localRepaintRect.x())
        return false;

    if (top >= localRepaintRect.maxY() || bottom <= localRepaintRect.y())
        return false;

    return true;
}

LayoutRect RootInlineBox::paddedLayoutOverflowRect(LayoutUnit endPadding) const
{
    LayoutRect lineLayoutOverflow = layoutOverflowRect(lineTop(), lineBottom());
    if (!endPadding)
        return lineLayoutOverflow;
    
    // FIXME: Audit whether to use pixel snapped values when not using integers for layout: https://bugs.webkit.org/show_bug.cgi?id=63656
    if (isHorizontal()) {
        if (isLeftToRightDirection())
            lineLayoutOverflow.shiftMaxXEdgeTo(std::max<LayoutUnit>(lineLayoutOverflow.maxX(), pixelSnappedLogicalRight() + endPadding));
        else
            lineLayoutOverflow.shiftXEdgeTo(std::min<LayoutUnit>(lineLayoutOverflow.x(), pixelSnappedLogicalLeft() - endPadding));
    } else {
        if (isLeftToRightDirection())
            lineLayoutOverflow.shiftMaxYEdgeTo(std::max<LayoutUnit>(lineLayoutOverflow.maxY(), pixelSnappedLogicalRight() + endPadding));
        else
            lineLayoutOverflow.shiftYEdgeTo(std::min<LayoutUnit>(lineLayoutOverflow.y(), pixelSnappedLogicalLeft() - endPadding));
    }
    
    return lineLayoutOverflow;
}

LayoutRect RenderMultiColumnSet::flowThreadPortionOverflowRect(const LayoutRect& portionRect, unsigned index, unsigned colCount, LayoutUnit colGap)
{
    // This function determines the portion of the flow thread that paints for the column. Along the inline axis, columns are
    // unclipped at outside edges (i.e., the first and last column in the set), and they clip to half the column
    // gap along interior edges.
    //
    // In the block direction, we will not clip overflow out of the top of the first column, or out of the bottom of
    // the last column. This applies only to the true first column and last column across all column sets.
    //
    // FIXME: Eventually we will know overflow on a per-column basis, but we can't do this until we have a painting
    // mode that understands not to paint contents from a previous column in the overflow area of a following column.
    // This problem applies to regions and pages as well and is not unique to columns.
    
    RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
    bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
    
    bool isFirstColumn = !index;
    bool isLastColumn = index == colCount - 1;
    bool isLeftmostColumn = style().isLeftToRightDirection() ^ progressionReversed ? isFirstColumn : isLastColumn;
    bool isRightmostColumn = style().isLeftToRightDirection() ^ progressionReversed ? isLastColumn : isFirstColumn;

    // Calculate the overflow rectangle, based on the flow thread's, clipped at column logical
    // top/bottom unless it's the first/last column.
    LayoutRect overflowRect = overflowRectForFlowThreadPortion(portionRect, isFirstColumn && isFirstRegion(), isLastColumn && isLastRegion(), VisualOverflow);

    // Avoid overflowing into neighboring columns, by clipping in the middle of adjacent column
    // gaps. Also make sure that we avoid rounding errors.
    if (isHorizontalWritingMode()) {
        if (!isLeftmostColumn)
            overflowRect.shiftXEdgeTo(portionRect.x() - colGap / 2);
        if (!isRightmostColumn)
            overflowRect.shiftMaxXEdgeTo(portionRect.maxX() + colGap - colGap / 2);
    } else {
        if (!isLeftmostColumn)
            overflowRect.shiftYEdgeTo(portionRect.y() - colGap / 2);
        if (!isRightmostColumn)
            overflowRect.shiftMaxYEdgeTo(portionRect.maxY() + colGap - colGap / 2);
    }
    return overflowRect;
}

LayoutRect MultiColumnFragmentainerGroup::flowThreadPortionOverflowRectAt(unsigned columnIndex) const
{
    // This function determines the portion of the flow thread that paints for the column. Along the inline axis, columns are
    // unclipped at outside edges (i.e., the first and last column in the set), and they clip to half the column
    // gap along interior edges.
    //
    // In the block direction, we will not clip overflow out of the top of the first column, or out of the bottom of
    // the last column. This applies only to the true first column and last column across all column sets.
    //
    // FIXME: Eventually we will know overflow on a per-column basis, but we can't do this until we have a painting
    // mode that understands not to paint contents from a previous column in the overflow area of a following column.
    bool isFirstColumnInRow = !columnIndex;
    bool isLastColumnInRow = columnIndex == actualColumnCount() - 1;
    bool isLTR = m_columnSet.style()->isLeftToRightDirection();
    bool isLeftmostColumn = isLTR ? isFirstColumnInRow : isLastColumnInRow;
    bool isRightmostColumn = isLTR ? isLastColumnInRow : isFirstColumnInRow;

    LayoutRect portionRect = flowThreadPortionRectAt(columnIndex);
    bool isFirstColumnInMulticolContainer = isFirstColumnInRow && this == &m_columnSet.firstFragmentainerGroup() && !m_columnSet.previousSiblingMultiColumnSet();
    bool isLastColumnInMulticolContainer = isLastColumnInRow && this == &m_columnSet.lastFragmentainerGroup() && !m_columnSet.nextSiblingMultiColumnSet();
    // Calculate the overflow rectangle, based on the flow thread's, clipped at column logical
    // top/bottom unless it's the first/last column.
    LayoutRect overflowRect = m_columnSet.overflowRectForFlowThreadPortion(portionRect, isFirstColumnInMulticolContainer, isLastColumnInMulticolContainer);

    // Avoid overflowing into neighboring columns, by clipping in the middle of adjacent column
    // gaps. Also make sure that we avoid rounding errors.
    LayoutUnit columnGap = m_columnSet.columnGap();
    if (m_columnSet.isHorizontalWritingMode()) {
        if (!isLeftmostColumn)
            overflowRect.shiftXEdgeTo(portionRect.x() - columnGap / 2);
        if (!isRightmostColumn)
            overflowRect.shiftMaxXEdgeTo(portionRect.maxX() + columnGap - columnGap / 2);
    } else {
        if (!isLeftmostColumn)
            overflowRect.shiftYEdgeTo(portionRect.y() - columnGap / 2);
        if (!isRightmostColumn)
            overflowRect.shiftMaxYEdgeTo(portionRect.maxY() + columnGap - columnGap / 2);
    }
    return overflowRect;
}

bool RenderReplaced::shouldPaint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline 
            && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseMask)
        return false;

    if (!paintInfo.shouldPaintWithinRoot(*this))
        return false;
        
    // if we're invisible or haven't received a layout yet, then just bail.
    if (style().visibility() != VISIBLE)
        return false;

    LayoutPoint adjustedPaintOffset = paintOffset + location();

    // Early exit if the element touches the edges.
    LayoutUnit top = adjustedPaintOffset.y() + visualOverflowRect().y();
    LayoutUnit bottom = adjustedPaintOffset.y() + visualOverflowRect().maxY();
    if (isSelected() && m_inlineBoxWrapper) {
        const RootInlineBox& rootBox = m_inlineBoxWrapper->root();
        LayoutUnit selTop = paintOffset.y() + rootBox.selectionTop();
        LayoutUnit selBottom = paintOffset.y() + selTop + rootBox.selectionHeight();
        top = std::min(selTop, top);
        bottom = std::max(selBottom, bottom);
    }
    
    LayoutRect localRepaintRect = paintInfo.rect;
    localRepaintRect.inflate(maximalOutlineSize(paintInfo.phase));
    if (adjustedPaintOffset.x() + visualOverflowRect().x() >= localRepaintRect.maxX() || adjustedPaintOffset.x() + visualOverflowRect().maxX() <= localRepaintRect.x())
        return false;

    if (top >= localRepaintRect.maxY() || bottom <= localRepaintRect.y())
        return false;

    return true;
}

void LayoutMultiColumnFlowThread::layout()
{
    ASSERT(!m_lastSetWorkedOn);
    m_lastSetWorkedOn = firstMultiColumnSet();
    if (m_lastSetWorkedOn)
        m_lastSetWorkedOn->beginFlow(LayoutUnit());
    LayoutFlowThread::layout();
    if (LayoutMultiColumnSet* lastSet = lastMultiColumnSet()) {
        ASSERT(lastSet == m_lastSetWorkedOn);
        if (!lastSet->nextSiblingMultiColumnBox()) {
            // Include trailing overflow in the last column set. The idea is that we will generate
            // additional columns and pages to hold that overflow, since people do write bad content
            // like <body style="height:0px"> in multi-column layouts.
            // TODO(mstensho): Once we support nested multicol, adding in overflow here may result
            // in the need for creating additional rows, since there may not be enough space
            // remaining in the currently last row.
            LayoutRect layoutRect = layoutOverflowRect();
            LayoutUnit logicalBottomInFlowThread = isHorizontalWritingMode() ? layoutRect.maxY() : layoutRect.maxX();
            ASSERT(logicalBottomInFlowThread >= logicalHeight());
            lastSet->endFlow(logicalBottomInFlowThread);
        }
    }
    m_lastSetWorkedOn = nullptr;
}

// The starting rect is the rect of the focused node, in document coordinates.
// Compose a virtual starting rect if there is no focused node or if it is off screen.
// The virtual rect is the edge of the container or frame. We select which
// edge depending on the direction of the navigation.
LayoutRect virtualRectForDirection(FocusType type, const LayoutRect& startingRect, LayoutUnit width)
{
    LayoutRect virtualStartingRect = startingRect;
    switch (type) {
    case FocusTypeLeft:
        virtualStartingRect.setX(virtualStartingRect.maxX() - width);
        virtualStartingRect.setWidth(width);
        break;
    case FocusTypeUp:
        virtualStartingRect.setY(virtualStartingRect.maxY() - width);
        virtualStartingRect.setHeight(width);
        break;
    case FocusTypeRight:
        virtualStartingRect.setWidth(width);
        break;
    case FocusTypeDown:
        virtualStartingRect.setHeight(width);
        break;
    default:
        ASSERT_NOT_REACHED();
    }

    return virtualStartingRect;
}

bool LineBoxList::rangeIntersectsRect(LayoutBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const
{
    LayoutBox* block;
    if (renderer->isBox())
        block = toLayoutBox(renderer);
    else
        block = renderer->containingBlock();
    LayoutUnit physicalStart = block->flipForWritingMode(logicalTop);
    LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom);
    LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart);
    physicalStart = std::min(physicalStart, physicalEnd);

    if (renderer->style()->isHorizontalWritingMode()) {
        physicalStart += offset.y();
        if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y())
            return false;
    } else {
        physicalStart += offset.x();
        if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x())
            return false;
    }

    return true;
}

IntRect enclosingIntRect(const LayoutRect& rect)
{
    // Empty rects with fractional x, y values turn into non-empty rects when converting to enclosing.
    // We need to ensure that empty rects stay empty after the conversion, because the selection code expects them to be empty.
    IntPoint location = flooredIntPoint(rect.minXMinYCorner());
    IntPoint maxPoint = IntPoint(rect.width() ? rect.maxX().ceil() : location.x(), rect.height() ? rect.maxY().ceil() : location.y());
    return IntRect(location, maxPoint - location);
}

void RenderLineBreak::collectSelectionRects(Vector<SelectionRect>& rects, unsigned, unsigned)
{
    ensureLineBoxes(*this);
    InlineElementBox* box = m_inlineBoxWrapper;
    if (!box)
        return;
    const RootInlineBox& rootBox = box->root();
    LayoutRect rect = rootBox.computeCaretRect(box->logicalLeft(), 0, nullptr);
    if (rootBox.isFirstAfterPageBreak()) {
        if (box->isHorizontal())
            rect.shiftYEdgeTo(rootBox.lineTopWithLeading());
        else
            rect.shiftXEdgeTo(rootBox.lineTopWithLeading());
    }

    RenderBlock* containingBlock = this->containingBlock();
    // Map rect, extended left to leftOffset, and right to rightOffset, through transforms to get minX and maxX.
    LogicalSelectionOffsetCaches cache(*containingBlock);
    LayoutUnit leftOffset = containingBlock->logicalLeftSelectionOffset(*containingBlock, box->logicalTop(), cache);
    LayoutUnit rightOffset = containingBlock->logicalRightSelectionOffset(*containingBlock, box->logicalTop(), cache);
    LayoutRect extentsRect = rect;
    if (box->isHorizontal()) {
        extentsRect.setX(leftOffset);
        extentsRect.setWidth(rightOffset - leftOffset);
    } else {
        extentsRect.setY(leftOffset);
        extentsRect.setHeight(rightOffset - leftOffset);
    }
    extentsRect = localToAbsoluteQuad(FloatRect(extentsRect)).enclosingBoundingBox();
    if (!box->isHorizontal())
        extentsRect = extentsRect.transposedRect();
    bool isFirstOnLine = !box->previousOnLineExists();
    bool isLastOnLine = !box->nextOnLineExists();
    if (containingBlock->isRubyBase() || containingBlock->isRubyText())
        isLastOnLine = !containingBlock->containingBlock()->inlineBoxWrapper()->nextOnLineExists();

    bool isFixed = false;
    IntRect absRect = localToAbsoluteQuad(FloatRect(rect), UseTransforms, &isFixed).enclosingBoundingBox();
    bool boxIsHorizontal = !box->isSVGInlineTextBox() ? box->isHorizontal() : !style().svgStyle().isVerticalWritingMode();
    // If the containing block is an inline element, we want to check the inlineBoxWrapper orientation
    // to determine the orientation of the block. In this case we also use the inlineBoxWrapper to
    // determine if the element is the last on the line.
    if (containingBlock->inlineBoxWrapper()) {
        if (containingBlock->inlineBoxWrapper()->isHorizontal() != boxIsHorizontal) {
            boxIsHorizontal = containingBlock->inlineBoxWrapper()->isHorizontal();
            isLastOnLine = !containingBlock->inlineBoxWrapper()->nextOnLineExists();
        }
    }

    rects.append(SelectionRect(absRect, box->direction(), extentsRect.x(), extentsRect.maxX(), extentsRect.maxY(), 0, box->isLineBreak(), isFirstOnLine, isLastOnLine, false, false, boxIsHorizontal, isFixed, containingBlock->isRubyText(), view().pageNumberForBlockProgressionOffset(absRect.x())));
}

RoundedInnerRectClipper::RoundedInnerRectClipper(LayoutObject& layoutObject, const PaintInfo& paintInfo, const LayoutRect& rect, const FloatRoundedRect& clipRect, RoundedInnerRectClipperBehavior behavior)
    : m_layoutObject(layoutObject)
    , m_paintInfo(paintInfo)
    , m_useDisplayItemList(RuntimeEnabledFeatures::slimmingPaintEnabled() && behavior == ApplyToDisplayListIfEnabled)
    , m_clipType(m_useDisplayItemList ? m_paintInfo.displayItemTypeForClipping() : DisplayItem::ClipBoxPaintPhaseFirst)
{
    Vector<FloatRoundedRect> roundedRectClips;
    if (clipRect.isRenderable()) {
        roundedRectClips.append(clipRect);
    } else {
        // We create a rounded rect for each of the corners and clip it, while making sure we clip opposing corners together.
        if (!clipRect.radii().topLeft().isEmpty() || !clipRect.radii().bottomRight().isEmpty()) {
            FloatRect topCorner(clipRect.rect().x(), clipRect.rect().y(), rect.maxX() - clipRect.rect().x(), rect.maxY() - clipRect.rect().y());
            FloatRoundedRect::Radii topCornerRadii;
            topCornerRadii.setTopLeft(clipRect.radii().topLeft());
            roundedRectClips.append(FloatRoundedRect(topCorner, topCornerRadii));

            FloatRect bottomCorner(rect.x().toFloat(), rect.y().toFloat(), clipRect.rect().maxX() - rect.x().toFloat(), clipRect.rect().maxY() - rect.y().toFloat());
            FloatRoundedRect::Radii bottomCornerRadii;
            bottomCornerRadii.setBottomRight(clipRect.radii().bottomRight());
            roundedRectClips.append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
        }

        if (!clipRect.radii().topRight().isEmpty() || !clipRect.radii().bottomLeft().isEmpty()) {
            FloatRect topCorner(rect.x().toFloat(), clipRect.rect().y(), clipRect.rect().maxX() - rect.x().toFloat(), rect.maxY() - clipRect.rect().y());
            FloatRoundedRect::Radii topCornerRadii;
            topCornerRadii.setTopRight(clipRect.radii().topRight());
            roundedRectClips.append(FloatRoundedRect(topCorner, topCornerRadii));

            FloatRect bottomCorner(clipRect.rect().x(), rect.y().toFloat(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y().toFloat());
            FloatRoundedRect::Radii bottomCornerRadii;
            bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
            roundedRectClips.append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
        }
    }

    if (m_useDisplayItemList) {
        ASSERT(m_paintInfo.context->displayItemList());
        if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
            return;
        m_paintInfo.context->displayItemList()->createAndAppend<ClipDisplayItem>(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips);
    } else {
        ClipDisplayItem clipDisplayItem(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips);
        clipDisplayItem.replay(*paintInfo.context);
    }
}

LayoutRect RenderNamedFlowThread::decorationsClipRectForBoxInNamedFlowFragment(const RenderBox& box, RenderNamedFlowFragment& fragment) const
{
    LayoutRect visualOverflowRect = fragment.visualOverflowRectForBox(&box);
    LayoutUnit initialLogicalX = style().isHorizontalWritingMode() ? visualOverflowRect.x() : visualOverflowRect.y();

    // The visual overflow rect returned by visualOverflowRectForBox is already flipped but the
    // RenderRegion::rectFlowPortionForBox method expects it unflipped.
    flipForWritingModeLocalCoordinates(visualOverflowRect);
    visualOverflowRect = fragment.rectFlowPortionForBox(&box, visualOverflowRect);
    
    // Now flip it again.
    flipForWritingModeLocalCoordinates(visualOverflowRect);

    // Take the scrolled offset of this object's parents into consideration.
    IntSize scrolledContentOffset;
    RenderBlock* containingBlock = box.containingBlock();
    while (containingBlock) {
        if (containingBlock->isRenderNamedFlowThread()) {
            // We've reached the flow thread, take the scrolled offset of the region into consideration.
            ASSERT(containingBlock == this);
            scrolledContentOffset += fragment.fragmentContainer().scrolledContentOffset();
            break;
        }
        
        scrolledContentOffset += containingBlock->scrolledContentOffset();
        containingBlock = containingBlock->containingBlock();
    }

    if (!scrolledContentOffset.isZero()) {
        if (style().isFlippedBlocksWritingMode())
            scrolledContentOffset = -scrolledContentOffset;
        
        visualOverflowRect.inflateX(scrolledContentOffset.width());
        visualOverflowRect.inflateY(scrolledContentOffset.height());
    }
    
    // Layers are in physical coordinates so the origin must be moved to the physical top-left of the flowthread.
    if (style().isFlippedBlocksWritingMode()) {
        if (style().isHorizontalWritingMode())
            visualOverflowRect.moveBy(LayoutPoint(0, height()));
        else
            visualOverflowRect.moveBy(LayoutPoint(width(), 0));
    }

    const RenderBox* iterBox = &box;
    while (iterBox && iterBox != this) {
        RenderBlock* containerBlock = iterBox->containingBlock();

        // FIXME: This doesn't work properly with flipped writing modes.
        // https://bugs.webkit.org/show_bug.cgi?id=125149
        if (iterBox->isPositioned()) {
            // For positioned elements, just use the layer's absolute bounding box.
            visualOverflowRect.moveBy(iterBox->layer()->absoluteBoundingBox().location());
            break;
        }

        LayoutRect currentBoxRect = iterBox->frameRect();
        if (iterBox->style().isFlippedBlocksWritingMode()) {
            if (iterBox->style().isHorizontalWritingMode())
                currentBoxRect.setY(currentBoxRect.height() - currentBoxRect.maxY());
            else
                currentBoxRect.setX(currentBoxRect.width() - currentBoxRect.maxX());
        }

        if (containerBlock->style().writingMode() != iterBox->style().writingMode())
            iterBox->flipForWritingMode(currentBoxRect);

        visualOverflowRect.moveBy(currentBoxRect.location());
        iterBox = containerBlock;
    }

    // Since the purpose of this method is to make sure the borders of a fragmented
    // element don't overflow the region in the fragmentation direction, there's no
    // point in restricting the clipping rect on the logical X axis. 
    // This also saves us the trouble of handling percent-based widths and margins
    // since the absolute bounding box of a positioned element would not contain
    // the correct coordinates relative to the region we're interested in, but rather
    // relative to the actual flow thread.
    if (style().isHorizontalWritingMode()) {
        if (initialLogicalX < visualOverflowRect.x())
            visualOverflowRect.shiftXEdgeTo(initialLogicalX);
        if (visualOverflowRect.width() < frameRect().width())
            visualOverflowRect.setWidth(frameRect().width());
    } else {
        if (initialLogicalX < visualOverflowRect.y())
            visualOverflowRect.shiftYEdgeTo(initialLogicalX);
        if (visualOverflowRect.height() < frameRect().height())
            visualOverflowRect.setHeight(frameRect().height());
    }

    return visualOverflowRect;
}

void TableCellPainter::paintCollapsedBorders(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    ASSERT(paintInfo.phase == PaintPhaseCollapsedTableBorders);

    if (!paintInfo.shouldPaintWithinRoot(&m_renderTableCell) || m_renderTableCell.style()->visibility() != VISIBLE)
        return;

    LayoutRect paintRect = paintBounds(paintOffset, AddOffsetFromParent);
    if (paintRect.y() - m_renderTableCell.table()->outerBorderTop() >= paintInfo.rect.maxY())
        return;

    if (paintRect.maxY() + m_renderTableCell.table()->outerBorderBottom() <= paintInfo.rect.y())
        return;

    if (!m_renderTableCell.table()->currentBorderValue())
        return;

    RenderDrawingRecorder recorder(paintInfo.context, m_renderTableCell, paintInfo.phase, paintRect);
    if (recorder.canUseCachedDrawing())
        return;

    const RenderStyle* styleForCellFlow = m_renderTableCell.styleForCellFlow();
    CollapsedBorderValue leftVal = cachedCollapsedLeftBorder(styleForCellFlow);
    CollapsedBorderValue rightVal = cachedCollapsedRightBorder(styleForCellFlow);
    CollapsedBorderValue topVal = cachedCollapsedTopBorder(styleForCellFlow);
    CollapsedBorderValue bottomVal = cachedCollapsedBottomBorder(styleForCellFlow);

    // Adjust our x/y/width/height so that we paint the collapsed borders at the correct location.
    int topWidth = topVal.width();
    int bottomWidth = bottomVal.width();
    int leftWidth = leftVal.width();
    int rightWidth = rightVal.width();

    IntRect borderRect = pixelSnappedIntRect(paintRect.x() - leftWidth / 2,
        paintRect.y() - topWidth / 2,
        paintRect.width() + leftWidth / 2 + (rightWidth + 1) / 2,
        paintRect.height() + topWidth / 2 + (bottomWidth + 1) / 2);

    EBorderStyle topStyle = collapsedBorderStyle(topVal.style());
    EBorderStyle bottomStyle = collapsedBorderStyle(bottomVal.style());
    EBorderStyle leftStyle = collapsedBorderStyle(leftVal.style());
    EBorderStyle rightStyle = collapsedBorderStyle(rightVal.style());

    bool renderTop = topStyle > BHIDDEN && !topVal.isTransparent();
    bool renderBottom = bottomStyle > BHIDDEN && !bottomVal.isTransparent();
    bool renderLeft = leftStyle > BHIDDEN && !leftVal.isTransparent();
    bool renderRight = rightStyle > BHIDDEN && !rightVal.isTransparent();

    // We never paint diagonals at the joins.  We simply let the border with the highest
    // precedence paint on top of borders with lower precedence.
    CollapsedBorders borders;
    borders.addBorder(topVal, BSTop, renderTop, borderRect.x(), borderRect.y(), borderRect.maxX(), borderRect.y() + topWidth, topStyle);
    borders.addBorder(bottomVal, BSBottom, renderBottom, borderRect.x(), borderRect.maxY() - bottomWidth, borderRect.maxX(), borderRect.maxY(), bottomStyle);
    borders.addBorder(leftVal, BSLeft, renderLeft, borderRect.x(), borderRect.y(), borderRect.x() + leftWidth, borderRect.maxY(), leftStyle);
    borders.addBorder(rightVal, BSRight, renderRight, borderRect.maxX() - rightWidth, borderRect.y(), borderRect.maxX(), borderRect.maxY(), rightStyle);

    GraphicsContext* graphicsContext = paintInfo.context;
    bool antialias = BoxPainter::shouldAntialiasLines(graphicsContext);

    for (CollapsedBorder* border = borders.nextBorder(); border; border = borders.nextBorder()) {
        if (border->borderValue.isSameIgnoringColor(*m_renderTableCell.table()->currentBorderValue())) {
            ObjectPainter::drawLineForBoxSide(graphicsContext, border->x1, border->y1, border->x2, border->y2, border->side,
                border->borderValue.color().resolve(m_renderTableCell.resolveColor(CSSPropertyColor)), border->style, 0, 0, antialias);
        }
    }
}

// Return true if rect |a| is below |b|. False otherwise.
// For overlapping rects, |a| is considered to be below |b|
// if both edges of |a| are below the respective ones of |b|
static inline bool below(const LayoutRect& a, const LayoutRect& b)
{
    return a.y() >= b.maxY()
        || (a.y() >= b.y() && a.maxY() > b.maxY());
}