blob: 921b479a60f0a37ddda15ff8b9cec902f489132c [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003, 2006, 2007, 2015 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "FrameView.h"
#include "RenderBoxModelObject.h"
#include "RenderOverflow.h"
#include "ScrollSnapOffsetsInfo.h"
#include "ScrollTypes.h"
#include "ShapeOutsideInfo.h"
namespace WebCore {
class LegacyInlineElementBox;
class RenderBlockFlow;
class RenderBoxFragmentInfo;
class RenderFragmentContainer;
struct PaintInfo;
enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
enum ShouldComputePreferred { ComputeActual, ComputePreferred };
enum class StretchingMode { Any, Explicit };
class RenderBox : public RenderBoxModelObject {
WTF_MAKE_ISO_ALLOCATED(RenderBox);
public:
virtual ~RenderBox();
// hasAutoZIndex only returns true if the element is positioned or a flex-item since
// position:static elements that are not flex-items get their z-index coerced to auto.
bool requiresLayer() const override
{
return isDocumentElementRenderer() || isPositioned() || createsGroup() || hasNonVisibleOverflow()
|| hasTransformRelatedProperty() || hasHiddenBackface() || hasReflection() || style().specifiesColumns()
|| style().containsLayout() || !style().hasAutoUsedZIndex() || hasRunningAcceleratedAnimations();
}
bool requiresLayerWithScrollableArea() const;
bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const final;
// Returns false for the body renderer if its background is propagated to the root.
bool paintsOwnBackground() const;
LayoutUnit x() const { return m_frameRect.x(); }
LayoutUnit y() const { return m_frameRect.y(); }
LayoutUnit width() const { return m_frameRect.width(); }
LayoutUnit height() const { return m_frameRect.height(); }
// These represent your location relative to your container as a physical offset.
// In layout related methods you almost always want the logical location (e.g. x() and y()).
LayoutUnit top() const { return topLeftLocation().y(); }
LayoutUnit left() const { return topLeftLocation().x(); }
template<typename T> void setX(T x) { m_frameRect.setX(x); }
template<typename T> void setY(T y) { m_frameRect.setY(y); }
template<typename T> void setWidth(T width) { m_frameRect.setWidth(width); }
template<typename T> void setHeight(T height) { m_frameRect.setHeight(height); }
LayoutUnit logicalLeft() const { return style().isHorizontalWritingMode() ? x() : y(); }
LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); }
LayoutUnit logicalTop() const { return style().isHorizontalWritingMode() ? y() : x(); }
LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); }
LayoutUnit logicalWidth() const { return style().isHorizontalWritingMode() ? width() : height(); }
LayoutUnit logicalHeight() const { return style().isHorizontalWritingMode() ? height() : width(); }
enum class AllowIntrinsic { Yes, No };
LayoutUnit constrainLogicalWidthInFragmentByMinMax(LayoutUnit, LayoutUnit, RenderBlock&, RenderFragmentContainer*, AllowIntrinsic = AllowIntrinsic::Yes) const;
LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const;
LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const;
void setLogicalLeft(LayoutUnit left)
{
if (style().isHorizontalWritingMode())
setX(left);
else
setY(left);
}
void setLogicalTop(LayoutUnit top)
{
if (style().isHorizontalWritingMode())
setY(top);
else
setX(top);
}
void setLogicalLocation(const LayoutPoint& location)
{
if (style().isHorizontalWritingMode())
setLocation(location);
else
setLocation(location.transposedPoint());
}
void setLogicalWidth(LayoutUnit size)
{
if (style().isHorizontalWritingMode())
setWidth(size);
else
setHeight(size);
}
void setLogicalHeight(LayoutUnit size)
{
if (style().isHorizontalWritingMode())
setHeight(size);
else
setWidth(size);
}
void setLogicalSize(const LayoutSize& size)
{
if (style().isHorizontalWritingMode())
setSize(size);
else
setSize(size.transposedSize());
}
LayoutPoint location() const { return m_frameRect.location(); }
LayoutSize locationOffset() const { return LayoutSize(x(), y()); }
LayoutSize size() const { return m_frameRect.size(); }
LayoutSize logicalSize() const { return style().isHorizontalWritingMode() ? m_frameRect.size() : m_frameRect.size().transposedSize(); }
void setLocation(const LayoutPoint& location) { m_frameRect.setLocation(location); }
void setSize(const LayoutSize& size) { m_frameRect.setSize(size); }
void move(LayoutUnit dx, LayoutUnit dy) { m_frameRect.move(dx, dy); }
LayoutRect frameRect() const { return m_frameRect; }
void setFrameRect(const LayoutRect& rect) { m_frameRect = rect; }
LayoutRect marginBoxRect() const
{
auto marginLeft = computedCSSPadding(style().marginLeft());
auto marginRight = computedCSSPadding(style().marginRight());
auto marginTop = computedCSSPadding(style().marginTop());
auto marginBottom = computedCSSPadding(style().marginBottom());
return LayoutRect(-marginLeft, -marginTop, size().width() + marginLeft + marginRight, size().height() + marginTop + marginBottom);
}
LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); }
LayoutRect borderBoundingBox() const final { return borderBoxRect(); }
LayoutSize borderBoxLogicalSize() const { return logicalSize(); }
WEBCORE_EXPORT RoundedRect::Radii borderRadii() const;
RoundedRect roundedBorderBoxRect() const;
// The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border).
LayoutRect contentBoxRect() const;
LayoutPoint contentBoxLocation() const;
// https://www.w3.org/TR/css-transforms-1/#reference-box
FloatRect referenceBoxRect(CSSBoxType) const final;
// The content box in absolute coords. Ignores transforms.
IntRect absoluteContentBox() const;
// The content box converted to absolute coords (taking transforms into account).
WEBCORE_EXPORT FloatQuad absoluteContentQuad() const;
// This returns the content area of the box (excluding padding and border). The only difference with contentBoxRect is that computedCSSContentBoxRect
// does include the intrinsic padding in the content box as this is what some callers expect (like getComputedStyle).
LayoutRect computedCSSContentBoxRect() const { return LayoutRect(borderLeft() + computedCSSPaddingLeft(), borderTop() + computedCSSPaddingTop(), paddingBoxWidth() - computedCSSPaddingLeft() - computedCSSPaddingRight(), paddingBoxHeight() - computedCSSPaddingTop() - computedCSSPaddingBottom()); }
// Bounds of the outline box in absolute coords. Respects transforms
LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap*) const final;
void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = nullptr) override;
FloatRect repaintRectInLocalCoordinates() const override { return borderBoxRect(); }
FloatRect objectBoundingBox() const override { return borderBoxRect(); }
// Note these functions are not equivalent of childrenOfType<RenderBox>
RenderBox* parentBox() const;
RenderBox* firstChildBox() const;
RenderBox* lastChildBox() const;
RenderBox* previousSiblingBox() const;
RenderBox* nextSiblingBox() const;
// Visual and layout overflow are in the coordinate space of the box. This means that they aren't purely physical directions.
// For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right
// respectively are flipped when compared to their physical counterparts. For example minX is on the left in vertical-lr,
// but it is on the right in vertical-rl.
WEBCORE_EXPORT LayoutRect flippedClientBoxRect() const;
LayoutRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : flippedClientBoxRect(); }
LayoutUnit logicalLeftLayoutOverflow() const { return style().isHorizontalWritingMode() ? layoutOverflowRect().x() : layoutOverflowRect().y(); }
LayoutUnit logicalRightLayoutOverflow() const { return style().isHorizontalWritingMode() ? layoutOverflowRect().maxX() : layoutOverflowRect().maxY(); }
LayoutRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); }
LayoutUnit logicalLeftVisualOverflow() const { return style().isHorizontalWritingMode() ? visualOverflowRect().x() : visualOverflowRect().y(); }
LayoutUnit logicalRightVisualOverflow() const { return style().isHorizontalWritingMode() ? visualOverflowRect().maxX() : visualOverflowRect().maxY(); }
void addLayoutOverflow(const LayoutRect&);
void addVisualOverflow(const LayoutRect&);
void clearOverflow();
virtual bool isTopLayoutOverflowAllowed() const { return !style().isLeftToRightDirection() && !isHorizontalWritingMode(); }
virtual bool isLeftLayoutOverflowAllowed() const { return !style().isLeftToRightDirection() && isHorizontalWritingMode(); }
void addVisualEffectOverflow();
LayoutRect applyVisualEffectOverflow(const LayoutRect&) const;
void addOverflowFromChild(const RenderBox* child) { addOverflowFromChild(child, child->locationOffset()); }
void addOverflowFromChild(const RenderBox* child, const LayoutSize& delta);
void applyTransform(TransformationMatrix&, const RenderStyle&, const FloatRect& boundingBox, OptionSet<RenderStyle::TransformOperationOption> = RenderStyle::allTransformOperations) const override;
LayoutSize contentSize() const { return { contentWidth(), contentHeight() }; }
LayoutUnit contentWidth() const { return std::max(0_lu, paddingBoxWidth() - paddingLeft() - paddingRight()); }
LayoutUnit contentHeight() const { return std::max(0_lu, paddingBoxHeight() - paddingTop() - paddingBottom()); }
LayoutSize contentLogicalSize() const { return style().isHorizontalWritingMode() ? contentSize() : contentSize().transposedSize(); }
LayoutUnit contentLogicalWidth() const { return style().isHorizontalWritingMode() ? contentWidth() : contentHeight(); }
LayoutUnit contentLogicalHeight() const { return style().isHorizontalWritingMode() ? contentHeight() : contentWidth(); }
LayoutUnit paddingBoxWidth() const { return std::max(0_lu, width() - borderLeft() - borderRight() - verticalScrollbarWidth()); }
LayoutUnit paddingBoxHeight() const { return std::max(0_lu, height() - borderTop() - borderBottom() - horizontalScrollbarHeight()); }
LayoutRect paddingBoxRect() const;
LayoutRect paddingBoxRectIncludingScrollbar() const { return LayoutRect(borderLeft(), borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom()); }
// IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (RenderFlow)
// to return the remaining width on a given line (and the height of a single line).
LayoutUnit offsetWidth() const override { return width(); }
LayoutUnit offsetHeight() const override { return height(); }
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar. clientLeft/Top are just the borderLeftWidth and borderTopWidth.
LayoutUnit clientLeft() const { return borderLeft(); }
LayoutUnit clientTop() const { return borderTop(); }
WEBCORE_EXPORT LayoutUnit clientWidth() const;
WEBCORE_EXPORT LayoutUnit clientHeight() const;
LayoutUnit clientLogicalWidth() const { return style().isHorizontalWritingMode() ? clientWidth() : clientHeight(); }
LayoutUnit clientLogicalHeight() const { return style().isHorizontalWritingMode() ? clientHeight() : clientWidth(); }
LayoutUnit clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); }
LayoutRect clientBoxRect() const { return LayoutRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); }
// scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
// object has overflow:hidden/scroll/auto specified and also has overflow.
// scrollLeft/Top return the current scroll position. These methods are virtual so that objects like
// textareas can scroll shadow content (but pretend that they are the objects that are
// scrolling).
virtual int scrollLeft() const;
virtual int scrollTop() const;
virtual int scrollWidth() const;
virtual int scrollHeight() const;
virtual void setScrollLeft(int, const ScrollPositionChangeOptions&);
virtual void setScrollTop(int, const ScrollPositionChangeOptions&);
void setScrollPosition(const ScrollPosition&, const ScrollPositionChangeOptions&);
const LayoutBoxExtent& marginBox() const { return m_marginBox; }
LayoutUnit marginTop() const override { return m_marginBox.top(); }
LayoutUnit marginBottom() const override { return m_marginBox.bottom(); }
LayoutUnit marginLeft() const override { return m_marginBox.left(); }
LayoutUnit marginRight() const override { return m_marginBox.right(); }
void setMarginTop(LayoutUnit margin) { m_marginBox.setTop(margin); }
void setMarginBottom(LayoutUnit margin) { m_marginBox.setBottom(margin); }
void setMarginLeft(LayoutUnit margin) { m_marginBox.setLeft(margin); }
void setMarginRight(LayoutUnit margin) { m_marginBox.setRight(margin); }
LayoutUnit marginLogicalLeft(const RenderStyle* overrideStyle = nullptr) const { return m_marginBox.start((overrideStyle ? overrideStyle : &style())->writingMode()); }
LayoutUnit marginLogicalRight(const RenderStyle* overrideStyle = nullptr) const { return m_marginBox.end((overrideStyle ? overrideStyle : &style())->writingMode()); }
LayoutUnit marginBefore(const RenderStyle* overrideStyle = nullptr) const final { return m_marginBox.before((overrideStyle ? overrideStyle : &style())->writingMode()); }
LayoutUnit marginAfter(const RenderStyle* overrideStyle = nullptr) const final { return m_marginBox.after((overrideStyle ? overrideStyle : &style())->writingMode()); }
LayoutUnit marginStart(const RenderStyle* overrideStyle = nullptr) const final
{
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style();
return m_marginBox.start(styleToUse->writingMode(), styleToUse->direction());
}
LayoutUnit marginEnd(const RenderStyle* overrideStyle = nullptr) const final
{
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style();
return m_marginBox.end(styleToUse->writingMode(), styleToUse->direction());
}
void setMarginBefore(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) { m_marginBox.setBefore(value, (overrideStyle ? overrideStyle : &style())->writingMode()); }
void setMarginAfter(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) { m_marginBox.setAfter(value, (overrideStyle ? overrideStyle : &style())->writingMode()); }
void setMarginStart(LayoutUnit value, const RenderStyle* overrideStyle = nullptr)
{
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style();
m_marginBox.setStart(value, styleToUse->writingMode(), styleToUse->direction());
}
void setMarginEnd(LayoutUnit value, const RenderStyle* overrideStyle = nullptr)
{
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style();
m_marginBox.setEnd(value, styleToUse->writingMode(), styleToUse->direction());
}
virtual bool isSelfCollapsingBlock() const { return false; }
virtual LayoutUnit collapsedMarginBefore() const { return marginBefore(); }
virtual LayoutUnit collapsedMarginAfter() const { return marginAfter(); }
void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;
int reflectionOffset() const;
// Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
LayoutRect reflectedRect(const LayoutRect&) const;
void layout() override;
bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint& accumulatedOffset, HitTestAction) override;
bool hitTestVisualOverflow(const HitTestLocation&, const LayoutPoint& accumulatedOffset) const;
bool hitTestClipPath(const HitTestLocation&, const LayoutPoint& accumulatedOffset) const;
bool hitTestBorderRadius(const HitTestLocation&, const LayoutPoint& accumulatedOffset) const;
LayoutUnit minPreferredLogicalWidth() const override;
LayoutUnit maxPreferredLogicalWidth() const override;
LayoutUnit overridingLogicalWidth() const;
LayoutUnit overridingLogicalHeight() const;
bool hasOverridingLogicalHeight() const;
bool hasOverridingLogicalWidth() const;
void setOverridingLogicalHeight(LayoutUnit);
void setOverridingLogicalWidth(LayoutUnit);
void clearOverridingContentSize();
void clearOverridingLogicalHeight();
void clearOverridingLogicalWidth();
LayoutUnit overridingContentLogicalWidth() const { return std::max(LayoutUnit(), overridingLogicalWidth() - borderAndPaddingLogicalWidth() - scrollbarLogicalWidth()); }
LayoutUnit overridingContentLogicalHeight() const { return std::max(LayoutUnit(), overridingLogicalHeight() - borderAndPaddingLogicalHeight() - scrollbarLogicalHeight()); }
std::optional<LayoutUnit> overridingContainingBlockContentWidth() const override;
std::optional<LayoutUnit> overridingContainingBlockContentHeight() const override;
bool hasOverridingContainingBlockContentWidth() const override;
bool hasOverridingContainingBlockContentHeight() const override;
std::optional<LayoutUnit> overridingContainingBlockContentLogicalWidth() const;
std::optional<LayoutUnit> overridingContainingBlockContentLogicalHeight() const;
bool hasOverridingContainingBlockContentLogicalWidth() const;
bool hasOverridingContainingBlockContentLogicalHeight() const;
void setOverridingContainingBlockContentLogicalWidth(std::optional<LayoutUnit>);
void setOverridingContainingBlockContentLogicalHeight(std::optional<LayoutUnit>);
void clearOverridingContainingBlockContentSize();
void clearOverridingContainingBlockContentLogicalHeight();
// These are currently only used by Flexbox code. In some cases we must layout flex items with a different main size
// (the size in the main direction) than the one specified by the item in order to compute the value of flex basis, i.e.,
// the initial main size of the flex item before the free space is distributed.
Length overridingLogicalHeightLength() const;
Length overridingLogicalWidthLength() const;
void setOverridingLogicalHeightLength(const Length&);
void setOverridingLogicalWidthLength(const Length&);
bool hasOverridingLogicalHeightLength() const;
bool hasOverridingLogicalWidthLength() const;
void clearOverridingLogicalHeightLength();
void clearOverridingLogicalWidthLength();
LayoutSize offsetFromContainer(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const override;
LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(const Length& logicalWidth) const;
LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(const Length& logicalWidth) const;
LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit computedLogicalWidth, LengthType originalType) const;
LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit computedLogicalWidth, LengthType originalType) const;
template<typename T> LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(T computedLogicalWidth, LengthType originalType) const { return adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit(computedLogicalWidth), originalType); }
template<typename T> LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(T computedLogicalWidth, LengthType originalType) const { return adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit(computedLogicalWidth), originalType); }
// Overridden by fieldsets to subtract out the intrinsic border.
virtual LayoutUnit adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const;
virtual LayoutUnit adjustContentBoxLogicalHeightForBoxSizing(std::optional<LayoutUnit> height) const;
virtual LayoutUnit adjustIntrinsicLogicalHeightForBoxSizing(LayoutUnit height) const;
struct ComputedMarginValues {
LayoutUnit m_before;
LayoutUnit m_after;
LayoutUnit m_start;
LayoutUnit m_end;
};
struct LogicalExtentComputedValues {
LayoutUnit m_extent;
LayoutUnit m_position;
ComputedMarginValues m_margins;
};
// Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end
// of the containing block.
void computeInlineDirectionMargins(const RenderBlock& containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
// Used to resolve margins in the containing block's block-flow direction.
void computeBlockDirectionMargins(const RenderBlock& containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const;
void computeAndSetBlockDirectionMargins(const RenderBlock& containingBlock);
enum RenderBoxFragmentInfoFlags { CacheRenderBoxFragmentInfo, DoNotCacheRenderBoxFragmentInfo };
LayoutRect borderBoxRectInFragment(RenderFragmentContainer*, RenderBoxFragmentInfoFlags = CacheRenderBoxFragmentInfo) const;
LayoutRect clientBoxRectInFragment(RenderFragmentContainer*) const;
RenderFragmentContainer* clampToStartAndEndFragments(RenderFragmentContainer*) const;
bool hasFragmentRangeInFragmentedFlow() const;
virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const;
void positionLineBox(LegacyInlineElementBox&);
virtual std::unique_ptr<LegacyInlineElementBox> createInlineBox();
void dirtyLineBoxes(bool fullLayout);
// For inline replaced elements, this function returns the inline box that owns us. Enables
// the replaced RenderObject to quickly determine what line it is contained on and to easily
// iterate over structures on the line.
LegacyInlineElementBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; }
void setInlineBoxWrapper(LegacyInlineElementBox*);
void deleteLineBoxWrapper();
LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const override;
std::optional<LayoutRect> computeVisibleRectInContainer(const LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const
override;
void repaintDuringLayoutIfMoved(const LayoutRect&);
virtual void repaintOverhangingFloats(bool paintAllDescendants);
LayoutUnit containingBlockLogicalWidthForContent() const override;
LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject& containingBlock, RenderFragmentContainer* = nullptr, bool checkForPerpendicularWritingMode = true) const;
LayoutUnit containingBlockLogicalHeightForPositioned(const RenderBoxModelObject& containingBlock, bool checkForPerpendicularWritingMode = true) const;
LayoutUnit containingBlockLogicalWidthForContentInFragment(RenderFragmentContainer*) const;
LayoutUnit containingBlockAvailableLineWidthInFragment(RenderFragmentContainer*) const;
LayoutUnit perpendicularContainingBlockLogicalHeight() const;
virtual void updateLogicalWidth();
virtual void updateLogicalHeight();
virtual LogicalExtentComputedValues computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop) const;
void cacheIntrinsicContentLogicalHeightForFlexItem(LayoutUnit) const;
// This function will compute the logical border-box height, without laying
// out the box. This means that the result is only "correct" when the height
// is explicitly specified. This function exists so that intrinsic width
// calculations have a way to deal with children that have orthogonal writing modes.
// When there is no explicit height, this function assumes a content height of
// zero (and returns just border + padding).
LayoutUnit computeLogicalHeightWithoutLayout() const;
RenderBoxFragmentInfo* renderBoxFragmentInfo(RenderFragmentContainer*, RenderBoxFragmentInfoFlags = CacheRenderBoxFragmentInfo) const;
void computeLogicalWidthInFragment(LogicalExtentComputedValues&, RenderFragmentContainer* = nullptr) const;
bool stretchesToViewport() const
{
return document().inQuirksMode() && style().logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isDocumentElementRenderer() || isBody()) && !shouldComputeLogicalHeightFromAspectRatio() && !isInline();
}
virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
LayoutUnit intrinsicLogicalWidth() const { return style().isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
LayoutUnit intrinsicLogicalHeight() const { return style().isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
// Whether or not the element shrinks to its intrinsic width (rather than filling the width
// of a containing block). HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
bool sizesLogicalWidthToFitContent(SizeType) const;
bool hasStretchedLogicalHeight() const;
bool hasStretchedLogicalWidth(StretchingMode = StretchingMode::Any) const;
bool isStretchingColumnFlexItem() const;
bool columnFlexItemHasStretchAlignment() const;
LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock& cb, RenderFragmentContainer*) const;
LayoutUnit computeLogicalWidthInFragmentUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock& containingBlock, RenderFragmentContainer*) const;
std::optional<LayoutUnit> computeLogicalHeightUsing(SizeType, const Length& height, std::optional<LayoutUnit> intrinsicContentHeight) const;
std::optional<LayoutUnit> computeContentLogicalHeight(SizeType, const Length& height, std::optional<LayoutUnit> intrinsicContentHeight) const;
std::optional<LayoutUnit> computeContentAndScrollbarLogicalHeightUsing(SizeType, const Length& height, std::optional<LayoutUnit> intrinsicContentHeight) const;
LayoutUnit computeReplacedLogicalWidthUsing(SizeType, Length width) const;
LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred = ComputeActual) const;
LayoutUnit computeReplacedLogicalHeightUsing(SizeType, Length height) const;
LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const;
template<typename T> LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(T logicalWidth, ShouldComputePreferred shouldComputePreferred = ComputeActual) const { return computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit(logicalWidth), shouldComputePreferred); }
template<typename T> LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(T logicalHeight) const { return computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit(logicalHeight)); }
virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred = ComputeActual) const;
virtual LayoutUnit computeReplacedLogicalHeight(std::optional<LayoutUnit> estimatedUsedWidth = std::nullopt) const;
enum class UpdatePercentageHeightDescendants { Yes , No };
std::optional<LayoutUnit> computePercentageLogicalHeight(const Length& height, UpdatePercentageHeightDescendants = UpdatePercentageHeightDescendants::Yes) const;
LayoutUnit availableLogicalWidth() const { return contentLogicalWidth(); }
virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const;
LayoutUnit availableLogicalHeightUsing(const Length&, AvailableLogicalHeightType) const;
// There are a few cases where we need to refer specifically to the available physical width and available physical height.
// Relative positioning is one of those cases, since left/top offsets are physical.
LayoutUnit availableWidth() const { return style().isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); }
LayoutUnit availableHeight() const { return style().isHorizontalWritingMode() ? availableLogicalHeight(IncludeMarginBorderPadding) : availableLogicalWidth(); }
WEBCORE_EXPORT virtual int verticalScrollbarWidth() const;
WEBCORE_EXPORT int horizontalScrollbarHeight() const;
int intrinsicScrollbarLogicalWidth() const;
int scrollbarLogicalWidth() const { return style().isHorizontalWritingMode() ? verticalScrollbarWidth() : horizontalScrollbarHeight(); }
int scrollbarLogicalHeight() const { return style().isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); }
virtual bool scroll(ScrollDirection, ScrollGranularity, unsigned stepCount = 1, Element** stopElement = nullptr, RenderBox* startBox = nullptr, const IntPoint& wheelEventAbsolutePoint = IntPoint());
virtual bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, unsigned stepCount = 1, Element** stopElement = nullptr);
WEBCORE_EXPORT bool canBeScrolledAndHasScrollableArea() const;
virtual bool canBeProgramaticallyScrolled() const;
virtual void autoscroll(const IntPoint&);
bool canAutoscroll() const;
IntSize calculateAutoscrollDirection(const IntPoint& windowPoint) const;
static RenderBox* findAutoscrollable(RenderObject*);
virtual void stopAutoscroll() { }
virtual void panScroll(const IntPoint&);
bool canUseOverlayScrollbars() const;
bool hasAutoScrollbar(ScrollbarOrientation) const;
bool hasAlwaysPresentScrollbar(ScrollbarOrientation) const;
bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); }
bool scrollsOverflowX() const { return hasNonVisibleOverflow() && (style().overflowX() == Overflow::Scroll || style().overflowX() == Overflow::Auto); }
bool scrollsOverflowY() const { return hasNonVisibleOverflow() && (style().overflowY() == Overflow::Scroll || style().overflowY() == Overflow::Auto); }
bool hasHorizontalOverflow() const { return scrollWidth() != roundToInt(paddingBoxWidth()); }
bool hasVerticalOverflow() const { return scrollHeight() != roundToInt(paddingBoxHeight()); }
bool hasScrollableOverflowX() const { return scrollsOverflowX() && hasHorizontalOverflow(); }
bool hasScrollableOverflowY() const { return scrollsOverflowY() && hasVerticalOverflow(); }
LayoutBoxExtent scrollPaddingForViewportRect(const LayoutRect& viewportRect);
bool usesCompositedScrolling() const;
bool percentageLogicalHeightIsResolvable() const;
bool hasUnsplittableScrollingOverflow() const;
bool isUnsplittableForPagination() const;
bool shouldTreatChildAsReplacedInTableCells() const;
virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderFragmentContainer* = nullptr, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, PaintPhase = PaintPhase::BlockBackground) const;
virtual LayoutRect overflowClipRectForChildLayers(const LayoutPoint& location, RenderFragmentContainer* fragment, OverlayScrollbarSizeRelevancy relevancy) const { return overflowClipRect(location, fragment, relevancy); }
LayoutRect clipRect(const LayoutPoint& location, RenderFragmentContainer*) const;
virtual bool hasControlClip() const { return false; }
virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
bool pushContentsClip(PaintInfo&, const LayoutPoint& accumulatedOffset);
void popContentsClip(PaintInfo&, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset);
virtual void paintObject(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); }
virtual void paintBoxDecorations(PaintInfo&, const LayoutPoint&);
virtual void paintMask(PaintInfo&, const LayoutPoint&);
virtual void paintClippingMask(PaintInfo&, const LayoutPoint&);
void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
// Called when a positioned object moves but doesn't necessarily change size. A simplified layout is attempted
// that just updates the object's position. If the size does change, the object remains dirty.
bool tryLayoutDoingPositionedMovementOnly()
{
LayoutUnit oldWidth = width();
updateLogicalWidth();
// If we shrink to fit our width may have changed, so we still need full layout.
if (oldWidth != width())
return false;
updateLogicalHeight();
return true;
}
LayoutRect maskClipRect(const LayoutPoint& paintOffset);
VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;
void removeFloatingOrPositionedChildFromBlockLists();
RenderLayer* enclosingFloatPaintingLayer() const;
virtual std::optional<LayoutUnit> firstLineBaseline() const { return std::optional<LayoutUnit>(); }
virtual std::optional<LayoutUnit> inlineBlockBaseline(LineDirectionMode) const { return std::optional<LayoutUnit>(); } // Returns empty if we should skip this box when computing the baseline of an inline-block.
bool shrinkToAvoidFloats() const;
virtual bool avoidsFloats() const;
virtual void markForPaginationRelayoutIfNeeded() { }
LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
LayoutUnit baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
LayoutUnit offsetLeft() const override;
LayoutUnit offsetTop() const override;
LayoutPoint flipForWritingModeForChild(const RenderBox& child, const LayoutPoint&) const;
LayoutUnit flipForWritingMode(LayoutUnit position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
LayoutPoint flipForWritingMode(const LayoutPoint&) const;
LayoutSize flipForWritingMode(const LayoutSize&) const;
void flipForWritingMode(LayoutRect&) const;
FloatPoint flipForWritingMode(const FloatPoint&) const;
void flipForWritingMode(FloatRect&) const;
// These represent your location relative to your container as a physical offset.
// In layout related methods you almost always want the logical location (e.g. x() and y()).
LayoutPoint topLeftLocation() const;
LayoutSize topLeftLocationOffset() const;
void applyTopLeftLocationOffset(LayoutPoint& point) const
{
// This is inlined for speed, since it is used by updateLayerPosition() during scrolling.
if (!document().view() || !document().view()->hasFlippedBlockRenderers())
point.move(m_frameRect.x(), m_frameRect.y());
else
applyTopLeftLocationOffsetWithFlipping(point);
}
LayoutRect logicalVisualOverflowRectForPropagation(const RenderStyle*) const;
LayoutRect visualOverflowRectForPropagation(const RenderStyle*) const;
LayoutRect logicalLayoutOverflowRectForPropagation(const RenderStyle*) const;
LayoutRect layoutOverflowRectForPropagation(const RenderStyle*) const;
bool hasRenderOverflow() const { return m_overflow; }
bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); }
virtual bool needsPreferredWidthsRecalculation() const;
virtual void computeIntrinsicRatioInformation(FloatSize& /* intrinsicSize */, double& /* intrinsicRatio */) const { }
ScrollPosition scrollPosition() const;
LayoutSize cachedSizeForOverflowClip() const;
// Returns false if the rect has no intersection with the applied clip rect. When the context specifies edge-inclusive
// intersection, this return value allows distinguishing between no intersection and zero-area intersection.
bool applyCachedClipAndScrollPosition(LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const;
virtual bool hasRelativeDimensions() const;
virtual bool hasRelativeLogicalHeight() const;
virtual bool hasRelativeLogicalWidth() const;
bool hasHorizontalLayoutOverflow() const
{
if (!m_overflow)
return false;
auto layoutOverflowRect = m_overflow->layoutOverflowRect();
auto paddingBoxRect = flippedClientBoxRect();
return layoutOverflowRect.x() < paddingBoxRect.x() || layoutOverflowRect.maxX() > paddingBoxRect.maxX();
}
bool hasVerticalLayoutOverflow() const
{
if (!m_overflow)
return false;
auto layoutOverflowRect = m_overflow->layoutOverflowRect();
auto paddingBoxRect = flippedClientBoxRect();
return layoutOverflowRect.y() < paddingBoxRect.y() || layoutOverflowRect.maxY() > paddingBoxRect.maxY();
}
virtual RenderPtr<RenderBox> createAnonymousBoxWithSameTypeAs(const RenderBox&) const
{
ASSERT_NOT_REACHED();
return nullptr;
}
ShapeOutsideInfo* shapeOutsideInfo() const
{
return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr;
}
void markShapeOutsideDependentsForLayout()
{
if (isFloating())
removeFloatingOrPositionedChildFromBlockLists();
}
// True if this box can have a range in an outside fragmentation context.
bool canHaveOutsideFragmentRange() const { return !isRenderFragmentedFlow(); }
virtual bool needsLayoutAfterFragmentRangeChange() const { return false; }
bool isGridItem() const { return parent() && parent()->isRenderGrid() && !isExcludedFromNormalLayout(); }
bool isFlexItem() const { return parent() && parent()->isFlexibleBox() && !isExcludedFromNormalLayout(); }
virtual void adjustBorderBoxRectForPainting(LayoutRect&) { };
bool shouldComputeLogicalHeightFromAspectRatio() const;
protected:
RenderBox(Element&, RenderStyle&&, BaseTypeFlags);
RenderBox(Document&, RenderStyle&&, BaseTypeFlags);
void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
void updateFromStyle() override;
void willBeDestroyed() override;
bool establishesIndependentFormattingContext() const override;
virtual bool shouldResetLogicalHeightBeforeLayout() const { return false; }
void resetLogicalHeightBeforeLayoutIfNeeded();
virtual ItemPosition selfAlignmentNormalBehavior(const RenderBox* = nullptr) const { return ItemPosition::Stretch; }
// Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect.
bool getBackgroundPaintedExtent(const LayoutPoint& paintOffset, LayoutRect&) const;
virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const;
bool computeBackgroundIsKnownToBeObscured(const LayoutPoint& paintOffset) override;
void paintBackground(const PaintInfo&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone);
void paintFillLayer(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance, CompositeOperator, RenderElement* backgroundObject, BaseBackgroundColorUsage = BaseBackgroundColorUse);
void paintFillLayers(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, CompositeOperator = CompositeOperator::SourceOver, RenderElement* backgroundObject = nullptr);
void paintMaskImages(const PaintInfo&, const LayoutRect&);
BackgroundBleedAvoidance determineBackgroundBleedAvoidance(GraphicsContext&) const;
bool backgroundHasOpaqueTopLayer() const;
void computePositionedLogicalWidth(LogicalExtentComputedValues&, RenderFragmentContainer* = nullptr) const;
LayoutUnit computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const;
std::optional<LayoutUnit> computeIntrinsicLogicalContentHeightUsing(Length logicalHeightLength, std::optional<LayoutUnit> intrinsicContentHeight, LayoutUnit borderAndPadding) const;
virtual bool shouldComputeSizeAsReplaced() const { return isReplacedOrInlineBlock() && !isInlineBlockOrInlineTable(); }
void mapLocalToContainer(const RenderLayerModelObject* ancestorContainer, TransformState&, OptionSet<MapCoordinatesMode>, bool* wasFixed) const override;
const RenderObject* pushMappingToContainer(const RenderLayerModelObject*, RenderGeometryMap&) const override;
void mapAbsoluteToLocalPoint(OptionSet<MapCoordinatesMode>, TransformState&) const override;
void paintRootBoxFillLayers(const PaintInfo&);
bool skipContainingBlockForPercentHeightCalculation(const RenderBox& containingBlock, bool isPerpendicularWritingMode) const;
void incrementVisuallyNonEmptyPixelCountIfNeeded(const IntSize&);
bool shouldIgnoreAspectRatio() const;
bool shouldComputeLogicalWidthFromAspectRatio() const;
LayoutUnit computeLogicalWidthFromAspectRatioInternal() const;
LayoutUnit computeLogicalWidthFromAspectRatio(RenderFragmentContainer* = nullptr) const;
std::pair<LayoutUnit, LayoutUnit> computeMinMaxLogicalWidthFromAspectRatio() const;
static LayoutUnit blockSizeFromAspectRatio(LayoutUnit borderPaddingInlineSum, LayoutUnit borderPaddingBlockSum, double aspectRatio, BoxSizing boxSizing, LayoutUnit inlineSize)
{
if (boxSizing == BoxSizing::BorderBox)
return LayoutUnit(inlineSize / aspectRatio);
return LayoutUnit((inlineSize - borderPaddingInlineSum) / aspectRatio) + borderPaddingBlockSum;
}
void computePreferredLogicalWidths(const Length& minWidth, const Length& maxWidth, LayoutUnit borderAndPadding);
private:
bool replacedMinMaxLogicalHeightComputesAsNone(SizeType) const;
void updateShapeOutsideInfoAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle);
void updateGridPositionAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle);
bool scrollLayer(ScrollDirection, ScrollGranularity, unsigned stepCount, Element** stopElement);
bool fixedElementLaysOutRelativeToFrame(const FrameView&) const;
bool includeVerticalScrollbarSize() const;
bool includeHorizontalScrollbarSize() const;
bool isScrollableOrRubberbandableBox() const override;
// Returns true if we did a full repaint.
bool repaintLayerRectsForImage(WrappedImagePtr, const FillLayer& layers, bool drawingBackground);
void computePositionedLogicalHeight(LogicalExtentComputedValues&) const;
void computePositionedLogicalWidthUsing(SizeType, Length logicalWidth, const RenderBoxModelObject& containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
LogicalExtentComputedValues&) const;
void computePositionedLogicalHeightUsing(SizeType, Length logicalHeightLength, const RenderBoxModelObject& containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
Length logicalTop, Length logicalBottom, Length marginLogicalTop, Length marginLogicalBottom,
LogicalExtentComputedValues&) const;
void computePositionedLogicalHeightReplaced(LogicalExtentComputedValues&) const;
void computePositionedLogicalWidthReplaced(LogicalExtentComputedValues&) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
virtual void computeIntrinsicKeywordLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
}
// This function calculates the minimum and maximum preferred widths for an object.
// These values are used in shrink-to-fit layout systems.
// These include tables, positioned objects, floats and flexible boxes.
virtual void computePreferredLogicalWidths();
LayoutRect frameRectForStickyPositioning() const override { return frameRect(); }
LayoutRect computeVisibleRectUsingPaintOffset(const LayoutRect&) const;
void applyTopLeftLocationOffsetWithFlipping(LayoutPoint&) const;
private:
// The width/height of the contents + borders + padding. The x/y location is relative to our container (which is not always our parent).
LayoutRect m_frameRect;
protected:
LayoutBoxExtent m_marginBox;
// The preferred logical width of the element if it were to break its lines at every possible opportunity.
LayoutUnit m_minPreferredLogicalWidth;
// The preferred logical width of the element if it never breaks any lines at all.
LayoutUnit m_maxPreferredLogicalWidth;
// For inline replaced elements, the inline box that owns us.
LegacyInlineElementBox* m_inlineBoxWrapper { nullptr };
// Our overflow information.
RefPtr<RenderOverflow> m_overflow;
private:
// Used to store state between styleWillChange and styleDidChange
static bool s_hadNonVisibleOverflow;
};
inline RenderBox* RenderBox::parentBox() const
{
if (is<RenderBox>(parent()))
return downcast<RenderBox>(parent());
ASSERT(!parent());
return nullptr;
}
inline RenderBox* RenderBox::firstChildBox() const
{
if (is<RenderBox>(firstChild()))
return downcast<RenderBox>(firstChild());
ASSERT(!firstChild());
return nullptr;
}
inline RenderBox* RenderBox::lastChildBox() const
{
if (is<RenderBox>(lastChild()))
return downcast<RenderBox>(lastChild());
ASSERT(!lastChild());
return nullptr;
}
inline RenderBox* RenderBox::previousSiblingBox() const
{
if (is<RenderBox>(previousSibling()))
return downcast<RenderBox>(previousSibling());
ASSERT(!previousSibling());
return nullptr;
}
inline RenderBox* RenderBox::nextSiblingBox() const
{
if (is<RenderBox>(nextSibling()))
return downcast<RenderBox>(nextSibling());
ASSERT(!nextSibling());
return nullptr;
}
inline void RenderBox::setInlineBoxWrapper(LegacyInlineElementBox* boxWrapper)
{
if (boxWrapper) {
ASSERT(!m_inlineBoxWrapper);
// m_inlineBoxWrapper should already be 0. Deleting it is a safeguard against security issues.
// Otherwise, there will two line box wrappers keeping the reference to this renderer, and
// only one will be notified when the renderer is getting destroyed. The second line box wrapper
// will keep a stale reference.
if (UNLIKELY(m_inlineBoxWrapper != nullptr))
deleteLineBoxWrapper();
}
m_inlineBoxWrapper = boxWrapper;
}
LayoutUnit synthesizedBaselineFromBorderBox(const RenderBox&, LineDirectionMode);
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderBox, isBox())