Move rendering/RenderObject to layout/LayoutObject.

Source/core/rendering/RenderObject.h

-/*
- * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
- *           (C) 2000 Antti Koivisto (koivisto@kde.org)
- *           (C) 2000 Dirk Mueller (mueller@kde.org)
- *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
- * Copyright (C) 2009 Google 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.
- *
- */
-
-#ifndef RenderObject_h
-#define RenderObject_h
-
-#include "core/dom/Document.h"
-#include "core/dom/DocumentLifecycle.h"
-#include "core/dom/Element.h"
-#include "core/editing/TextAffinity.h"
-#include "core/fetch/ImageResourceClient.h"
-#include "core/html/HTMLElement.h"
-#include "core/inspector/InspectorTraceEvents.h"
-#include "core/layout/HitTestRequest.h"
-#include "core/layout/compositing/CompositingState.h"
-#include "core/layout/compositing/CompositingTriggers.h"
-#include "core/rendering/PaintInvalidationState.h"
-#include "core/rendering/PaintPhase.h"
-#include "core/rendering/RenderObjectChildList.h"
-#include "core/rendering/ScrollAlignment.h"
-#include "core/rendering/SubtreeLayoutScope.h"
-#include "core/rendering/style/RenderStyle.h"
-#include "core/rendering/style/StyleInheritedData.h"
-#include "platform/geometry/FloatQuad.h"
-#include "platform/geometry/LayoutRect.h"
-#include "platform/graphics/CompositingReasons.h"
-#include "platform/graphics/PaintInvalidationReason.h"
-#include "platform/graphics/paint/DisplayItemClient.h"
-#include "platform/transforms/TransformationMatrix.h"
-
-namespace blink {
-
-class AffineTransform;
-class Cursor;
-class DisplayItemList;
-class Document;
-class HitTestLocation;
-class HitTestResult;
-class InlineBox;
-class Position;
-class PositionWithAffinity;
-class PseudoStyleRequest;
-class RenderBoxModelObject;
-class RenderBlock;
-class RenderFlowThread;
-class RenderGeometryMap;
-class Layer;
-class LayoutLayerModelObject;
-class RenderMultiColumnSpannerPlaceholder;
-class RenderView;
-class TransformState;
-
-struct PaintInfo;
-
-enum CursorDirective {
-    SetCursorBasedOnStyle,
-    SetCursor,
-    DoNotSetCursor
-};
-
-enum HitTestFilter {
-    HitTestAll,
-    HitTestSelf,
-    HitTestDescendants
-};
-
-enum HitTestAction {
-    HitTestBlockBackground,
-    HitTestChildBlockBackground,
-    HitTestChildBlockBackgrounds,
-    HitTestFloat,
-    HitTestForeground
-};
-
-enum MarkingBehavior {
-    MarkOnlyThis,
-    MarkContainingBlockChain,
-};
-
-enum MapCoordinatesMode {
-    IsFixed = 1 << 0,
-    UseTransforms = 1 << 1,
-    ApplyContainerFlip = 1 << 2,
-    TraverseDocumentBoundaries = 1 << 3,
-};
-typedef unsigned MapCoordinatesFlags;
-
-const int caretWidth = 1;
-
-struct AnnotatedRegionValue {
-    bool operator==(const AnnotatedRegionValue& o) const
-    {
-        return draggable == o.draggable && bounds == o.bounds;
-    }
-
-    LayoutRect bounds;
-    bool draggable;
-};
-
-typedef WTF::HashMap<const Layer*, Vector<LayoutRect>> LayerHitTestRects;
-
-#ifndef NDEBUG
-const int showTreeCharacterOffset = 39;
-#endif
-
-// Base class for all rendering tree objects.
-class RenderObject : public ImageResourceClient {
-    friend class RenderBlock;
-    friend class RenderBlockFlow;
-    friend class LayerReflectionInfo; // For setParent
-    friend class LayerScrollableArea; // For setParent.
-    friend class RenderObjectChildList;
-    WTF_MAKE_NONCOPYABLE(RenderObject);
-public:
-    // Anonymous objects should pass the document as their node, and they will then automatically be
-    // marked as anonymous in the constructor.
-    explicit RenderObject(Node*);
-    virtual ~RenderObject();
-
-    virtual const char* renderName() const = 0;
-
-    String debugName() const;
-
-    RenderObject* parent() const { return m_parent; }
-    bool isDescendantOf(const RenderObject*) const;
-
-    RenderObject* previousSibling() const { return m_previous; }
-    RenderObject* nextSibling() const { return m_next; }
-
-    RenderObject* slowFirstChild() const
-    {
-        if (const RenderObjectChildList* children = virtualChildren())
-            return children->firstChild();
-        return 0;
-    }
-    RenderObject* slowLastChild() const
-    {
-        if (const RenderObjectChildList* children = virtualChildren())
-            return children->lastChild();
-        return 0;
-    }
-
-    virtual RenderObjectChildList* virtualChildren() { return 0; }
-    virtual const RenderObjectChildList* virtualChildren() const { return 0; }
-
-    RenderObject* nextInPreOrder() const;
-    RenderObject* nextInPreOrder(const RenderObject* stayWithin) const;
-    RenderObject* nextInPreOrderAfterChildren() const;
-    RenderObject* nextInPreOrderAfterChildren(const RenderObject* stayWithin) const;
-    RenderObject* previousInPreOrder() const;
-    RenderObject* previousInPreOrder(const RenderObject* stayWithin) const;
-    RenderObject* childAt(unsigned) const;
-
-    RenderObject* lastLeafChild() const;
-
-    // The following six functions are used when the render tree hierarchy changes to make sure layers get
-    // properly added and removed.  Since containership can be implemented by any subclass, and since a hierarchy
-    // can contain a mixture of boxes and other object types, these functions need to be in the base class.
-    Layer* enclosingLayer() const;
-    void addLayers(Layer* parentLayer);
-    void removeLayers(Layer* parentLayer);
-    void moveLayers(Layer* oldParent, Layer* newParent);
-    Layer* findNextLayer(Layer* parentLayer, RenderObject* startPoint, bool checkParent = true);
-
-    // Scrolling is a RenderBox concept, however some code just cares about recursively scrolling our enclosing ScrollableArea(s).
-    bool scrollRectToVisible(const LayoutRect&, const ScrollAlignment& alignX = ScrollAlignment::alignCenterIfNeeded, const ScrollAlignment& alignY = ScrollAlignment::alignCenterIfNeeded);
-
-    // Convenience function for getting to the nearest enclosing box of a RenderObject.
-    RenderBox* enclosingBox() const;
-    RenderBoxModelObject* enclosingBoxModelObject() const;
-
-    RenderBox* enclosingScrollableBox() const;
-
-    // Function to return our enclosing flow thread if we are contained inside one. This
-    // function follows the containing block chain.
-    RenderFlowThread* flowThreadContainingBlock() const
-    {
-        if (flowThreadState() == NotInsideFlowThread)
-            return 0;
-        return locateFlowThreadContainingBlock();
-    }
-
-#if ENABLE(ASSERT)
-    void setHasAXObject(bool flag) { m_hasAXObject = flag; }
-    bool hasAXObject() const { return m_hasAXObject; }
-
-    // Helper class forbidding calls to setNeedsLayout() during its lifetime.
-    class SetLayoutNeededForbiddenScope {
-    public:
-        explicit SetLayoutNeededForbiddenScope(RenderObject&);
-        ~SetLayoutNeededForbiddenScope();
-    private:
-        RenderObject& m_renderObject;
-        bool m_preexistingForbidden;
-    };
-
-    void assertRendererLaidOut() const
-    {
-#ifndef NDEBUG
-        if (needsLayout())
-            showRenderTreeForThis();
-#endif
-        ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());
-    }
-
-    void assertSubtreeIsLaidOut() const
-    {
-        for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
-            renderer->assertRendererLaidOut();
-    }
-
-    void assertRendererClearedPaintInvalidationState() const
-    {
-#ifndef NDEBUG
-        if (paintInvalidationStateIsDirty()) {
-            showRenderTreeForThis();
-            ASSERT_NOT_REACHED();
-        }
-#endif
-    }
-
-    void assertSubtreeClearedPaintInvalidationState() const
-    {
-        for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
-            renderer->assertRendererClearedPaintInvalidationState();
-    }
-
-#endif
-
-    // FIXME: This could be used when changing the size of a renderer without children to skip some invalidations.
-    bool rendererHasNoBoxEffect() const
-    {
-        return !style()->hasVisualOverflowingEffect() && !style()->hasBorder() && !style()->hasBackground();
-    }
-
-    // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
-    // children.
-    virtual RenderBlock* firstLineBlock() const;
-
-    // Called when an object that was floating or positioned becomes a normal flow object
-    // again.  We have to make sure the render tree updates as needed to accommodate the new
-    // normal flow object.
-    void handleDynamicFloatPositionChange();
-
-    // RenderObject tree manipulation
-    //////////////////////////////////////////
-    virtual bool canHaveChildren() const { return virtualChildren(); }
-    virtual bool canHaveGeneratedChildren() const;
-    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const { return true; }
-    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);
-    virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild = 0) { return addChild(newChild, beforeChild); }
-    virtual void removeChild(RenderObject*);
-    virtual bool createsAnonymousWrapper() const { return false; }
-    //////////////////////////////////////////
-
-protected:
-    //////////////////////////////////////////
-    // Helper functions. Dangerous to use!
-    void setPreviousSibling(RenderObject* previous) { m_previous = previous; }
-    void setNextSibling(RenderObject* next) { m_next = next; }
-    void setParent(RenderObject* parent)
-    {
-        m_parent = parent;
-
-        // Only update if our flow thread state is different from our new parent and if we're not a RenderFlowThread.
-        // A RenderFlowThread is always considered to be inside itself, so it never has to change its state
-        // in response to parent changes.
-        FlowThreadState newState = parent ? parent->flowThreadState() : NotInsideFlowThread;
-        if (newState != flowThreadState() && !isRenderFlowThread())
-            setFlowThreadStateIncludingDescendants(newState);
-    }
-
-    //////////////////////////////////////////
-private:
-#if ENABLE(ASSERT)
-    bool isSetNeedsLayoutForbidden() const { return m_setNeedsLayoutForbidden; }
-    void setNeedsLayoutIsForbidden(bool flag) { m_setNeedsLayoutForbidden = flag; }
-#endif
-
-    void addAbsoluteRectForLayer(LayoutRect& result);
-    bool requiresAnonymousTableWrappers(const RenderObject*) const;
-
-    // Gets pseudoStyle from Shadow host(in case of input elements)
-    // or from Parent element.
-    PassRefPtr<RenderStyle> getUncachedPseudoStyleFromParentOrShadowHost() const;
-
-    bool skipInvalidationWhenLaidOutChildren() const;
-
-public:
-#ifndef NDEBUG
-    void showTreeForThis() const;
-    void showRenderTreeForThis() const;
-    void showLineTreeForThis() const;
-
-    void showRenderObject() const;
-    // We don't make printedCharacters an optional parameter so that
-    // showRenderObject can be called from gdb easily.
-    void showRenderObject(int printedCharacters) const;
-    void showRenderTreeAndMark(const RenderObject* markedObject1 = 0, const char* markedLabel1 = 0, const RenderObject* markedObject2 = 0, const char* markedLabel2 = 0, int depth = 0) const;
-#endif
-
-    static RenderObject* createObject(Element*, RenderStyle*);
-    static unsigned instanceCount() { return s_instanceCount; }
-
-    // RenderObjects are allocated out of the rendering partition.
-    void* operator new(size_t);
-    void operator delete(void*);
-
-public:
-    bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
-
-    virtual bool isBoxModelObject() const { return false; }
-    bool isBR() const { return isOfType(RenderObjectBr); }
-    bool isCanvas() const { return isOfType(RenderObjectCanvas); }
-    bool isCounter() const { return isOfType(RenderObjectCounter); }
-    bool isDetailsMarker() const { return isOfType(RenderObjectDetailsMarker); }
-    bool isEmbeddedObject() const { return isOfType(RenderObjectEmbeddedObject); }
-    bool isFieldset() const { return isOfType(RenderObjectFieldset); }
-    bool isFileUploadControl() const { return isOfType(RenderObjectFileUploadControl); }
-    bool isFrame() const { return isOfType(RenderObjectFrame); }
-    bool isFrameSet() const { return isOfType(RenderObjectFrameSet); }
-    bool isLayoutTableCol() const { return isOfType(RenderObjectLayoutTableCol); }
-    bool isListBox() const { return isOfType(RenderObjectListBox); }
-    bool isListItem() const { return isOfType(RenderObjectListItem); }
-    bool isListMarker() const { return isOfType(RenderObjectListMarker); }
-    bool isMedia() const { return isOfType(RenderObjectMedia); }
-    bool isMenuList() const { return isOfType(RenderObjectMenuList); }
-    bool isMeter() const { return isOfType(RenderObjectMeter); }
-    bool isProgress() const { return isOfType(RenderObjectProgress); }
-    bool isQuote() const { return isOfType(RenderObjectQuote); }
-    bool isRenderButton() const { return isOfType(RenderObjectRenderButton); }
-    bool isRenderFullScreen() const { return isOfType(RenderObjectRenderFullScreen); }
-    bool isRenderFullScreenPlaceholder() const { return isOfType(RenderObjectRenderFullScreenPlaceholder); }
-    bool isRenderGrid() const { return isOfType(RenderObjectRenderGrid); }
-    bool isRenderIFrame() const { return isOfType(RenderObjectRenderIFrame); }
-    bool isRenderImage() const { return isOfType(RenderObjectRenderImage); }
-    bool isRenderMultiColumnSet() const { return isOfType(RenderObjectRenderMultiColumnSet); }
-    bool isRenderMultiColumnSpannerPlaceholder() const { return isOfType(RenderObjectRenderMultiColumnSpannerPlaceholder); }
-    bool isRenderRegion() const { return isOfType(RenderObjectRenderRegion); }
-    bool isRenderScrollbarPart() const { return isOfType(RenderObjectRenderScrollbarPart); }
-    bool isRenderView() const { return isOfType(RenderObjectRenderView); }
-    bool isReplica() const { return isOfType(RenderObjectReplica); }
-    bool isRuby() const { return isOfType(RenderObjectRuby); }
-    bool isRubyBase() const { return isOfType(RenderObjectRubyBase); }
-    bool isRubyRun() const { return isOfType(RenderObjectRubyRun); }
-    bool isRubyText() const { return isOfType(RenderObjectRubyText); }
-    bool isSlider() const { return isOfType(RenderObjectSlider); }
-    bool isSliderThumb() const { return isOfType(RenderObjectSliderThumb); }
-    bool isTable() const { return isOfType(RenderObjectTable); }
-    bool isTableCaption() const { return isOfType(RenderObjectTableCaption); }
-    bool isTableCell() const { return isOfType(RenderObjectTableCell); }
-    bool isTableRow() const { return isOfType(RenderObjectTableRow); }
-    bool isTableSection() const { return isOfType(RenderObjectTableSection); }
-    bool isTextArea() const { return isOfType(RenderObjectTextArea); }
-    bool isTextControl() const { return isOfType(RenderObjectTextControl); }
-    bool isTextField() const { return isOfType(RenderObjectTextField); }
-    bool isVideo() const { return isOfType(RenderObjectVideo); }
-    bool isWidget() const { return isOfType(RenderObjectWidget); }
-
-    virtual bool isImage() const { return false; }
-
-    virtual bool isInlineBlockOrInlineTable() const { return false; }
-    virtual bool isLayoutLayerModelObject() const { return false; }
-    virtual bool isRenderBlock() const { return false; }
-    virtual bool isRenderBlockFlow() const { return false; }
-    virtual bool isRenderFlowThread() const { return false; }
-    virtual bool isRenderInline() const { return false; }
-    virtual bool isRenderPart() const { return false; }
-
-    bool isDocumentElement() const { return document().documentElement() == m_node; }
-    // isBody is called from RenderBox::styleWillChange and is thus quite hot.
-    bool isBody() const { return node() && node()->hasTagName(HTMLNames::bodyTag); }
-    bool isHR() const;
-    bool isLegend() const;
-
-    bool isTablePart() const { return isTableCell() || isLayoutTableCol() || isTableCaption() || isTableRow() || isTableSection(); }
-
-    inline bool isBeforeContent() const;
-    inline bool isAfterContent() const;
-    inline bool isBeforeOrAfterContent() const;
-    static inline bool isAfterContent(const RenderObject* obj) { return obj && obj->isAfterContent(); }
-
-    bool hasCounterNodeMap() const { return m_bitfields.hasCounterNodeMap(); }
-    void setHasCounterNodeMap(bool hasCounterNodeMap) { m_bitfields.setHasCounterNodeMap(hasCounterNodeMap); }
-    bool everHadLayout() const { return m_bitfields.everHadLayout(); }
-
-    bool childrenInline() const { return m_bitfields.childrenInline(); }
-    void setChildrenInline(bool b) { m_bitfields.setChildrenInline(b); }
-    bool hasColumns() const { return m_bitfields.hasColumns(); }
-    void setHasColumns(bool b = true) { m_bitfields.setHasColumns(b); }
-
-    bool alwaysCreateLineBoxesForRenderInline() const
-    {
-        ASSERT(isRenderInline());
-        return m_bitfields.alwaysCreateLineBoxesForRenderInline();
-    }
-    void setAlwaysCreateLineBoxesForRenderInline(bool alwaysCreateLineBoxes)
-    {
-        ASSERT(isRenderInline());
-        m_bitfields.setAlwaysCreateLineBoxesForRenderInline(alwaysCreateLineBoxes);
-    }
-
-    bool ancestorLineBoxDirty() const { return m_bitfields.ancestorLineBoxDirty(); }
-    void setAncestorLineBoxDirty(bool value = true)
-    {
-        m_bitfields.setAncestorLineBoxDirty(value);
-        if (value)
-            setNeedsLayoutAndFullPaintInvalidation();
-    }
-
-    enum FlowThreadState {
-        NotInsideFlowThread = 0,
-        InsideOutOfFlowThread = 1,
-        InsideInFlowThread = 2,
-    };
-
-    void setFlowThreadStateIncludingDescendants(FlowThreadState);
-
-    FlowThreadState flowThreadState() const { return m_bitfields.flowThreadState(); }
-    void setFlowThreadState(FlowThreadState state) { m_bitfields.setFlowThreadState(state); }
-
-    // FIXME: Until all SVG renders can be subclasses of RenderSVGModelObject we have
-    // to add SVG renderer methods to RenderObject with an ASSERT_NOT_REACHED() default implementation.
-    bool isSVG() const { return isOfType(RenderObjectSVG); }
-    bool isSVGRoot() const { return isOfType(RenderObjectSVGRoot); }
-    bool isSVGContainer() const { return isOfType(RenderObjectSVGContainer); }
-    bool isSVGTransformableContainer() const { return isOfType(RenderObjectSVGTransformableContainer); }
-    bool isSVGViewportContainer() const { return isOfType(RenderObjectSVGViewportContainer); }
-    bool isSVGGradientStop() const { return isOfType(RenderObjectSVGGradientStop); }
-    bool isSVGHiddenContainer() const { return isOfType(RenderObjectSVGHiddenContainer); }
-    bool isSVGShape() const { return isOfType(RenderObjectSVGShape); }
-    bool isSVGText() const { return isOfType(RenderObjectSVGText); }
-    bool isSVGTextPath() const { return isOfType(RenderObjectSVGTextPath); }
-    bool isSVGInline() const { return isOfType(RenderObjectSVGInline); }
-    bool isSVGInlineText() const { return isOfType(RenderObjectSVGInlineText); }
-    bool isSVGImage() const { return isOfType(RenderObjectSVGImage); }
-    bool isSVGForeignObject() const { return isOfType(RenderObjectSVGForeignObject); }
-    bool isSVGResourceContainer() const { return isOfType(RenderObjectSVGResourceContainer); }
-    bool isSVGResourceFilter() const { return isOfType(RenderObjectSVGResourceFilter); }
-    bool isSVGResourceFilterPrimitive() const { return isOfType(RenderObjectSVGResourceFilterPrimitive); }
-
-    // FIXME: Those belong into a SVG specific base-class for all renderers (see above)
-    // Unfortunately we don't have such a class yet, because it's not possible for all renderers
-    // to inherit from RenderSVGObject -> RenderObject (some need RenderBlock inheritance for instance)
-    virtual void setNeedsTransformUpdate() { }
-    virtual void setNeedsBoundariesUpdate();
-
-    bool isBlendingAllowed() const { return !isSVG() || (isSVGContainer() && !isSVGHiddenContainer()) || isSVGShape() || isSVGImage() || isSVGText(); }
-    virtual bool hasNonIsolatedBlendingDescendants() const { return false; }
-    enum DescendantIsolationState {
-        DescendantIsolationRequired,
-        DescendantIsolationNeedsUpdate,
-    };
-    virtual void descendantIsolationRequirementsChanged(DescendantIsolationState) { }
-
-    // Per SVG 1.1 objectBoundingBox ignores clipping, masking, filter effects, opacity and stroke-width.
-    // This is used for all computation of objectBoundingBox relative units and by SVGLocatable::getBBox().
-    // NOTE: Markers are not specifically ignored here by SVG 1.1 spec, but we ignore them
-    // since stroke-width is ignored (and marker size can depend on stroke-width).
-    // objectBoundingBox is returned local coordinates.
-    // The name objectBoundingBox is taken from the SVG 1.1 spec.
-    virtual FloatRect objectBoundingBox() const;
-    virtual FloatRect strokeBoundingBox() const;
-
-    // Returns the smallest rectangle enclosing all of the painted content
-    // respecting clipping, masking, filters, opacity, stroke-width and markers
-    virtual FloatRect paintInvalidationRectInLocalCoordinates() const;
-
-    // This only returns the transform="" value from the element
-    // most callsites want localToParentTransform() instead.
-    virtual AffineTransform localTransform() const;
-
-    // Returns the full transform mapping from local coordinates to local coords for the parent SVG renderer
-    // This includes any viewport transforms and x/y offsets as well as the transform="" value off the element.
-    virtual const AffineTransform& localToParentTransform() const;
-
-    // SVG uses FloatPoint precise hit testing, and passes the point in parent
-    // coordinates instead of in paint invalidaiton container coordinates. Eventually the
-    // rest of the rendering tree will move to a similar model.
-    virtual bool nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint& pointInParent, HitTestAction);
-
-    bool isAnonymous() const { return m_bitfields.isAnonymous(); }
-    bool isAnonymousBlock() const
-    {
-        // This function is kept in sync with anonymous block creation conditions in
-        // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
-        // RenderBlock having a BLOCK or BOX display. Other classes such as RenderTextFragment
-        // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
-        return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderMultiColumnSet()
-            && !isRenderFullScreen()
-            && !isRenderFullScreenPlaceholder();
-    }
-    bool isAnonymousColumnsBlock() const { return style()->specifiesColumns() && isAnonymousBlock(); }
-    bool isAnonymousColumnSpanBlock() const { return style()->columnSpan() && isAnonymousBlock(); }
-    bool isElementContinuation() const { return node() && node()->renderer() != this; }
-    bool isInlineElementContinuation() const { return isElementContinuation() && isInline(); }
-    virtual RenderBoxModelObject* virtualContinuation() const { return 0; }
-
-    bool isFloating() const { return m_bitfields.floating(); }
-
-    bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
-    bool isRelPositioned() const { return m_bitfields.isRelPositioned(); } // relative positioning
-    bool isPositioned() const { return m_bitfields.isPositioned(); }
-
-    bool isText() const  { return m_bitfields.isText(); }
-    bool isBox() const { return m_bitfields.isBox(); }
-    bool isInline() const { return m_bitfields.isInline(); } // inline object
-    bool isDragging() const { return m_bitfields.isDragging(); }
-    bool isReplaced() const { return m_bitfields.isReplaced(); } // a "replaced" element (see CSS)
-    bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); }
-    bool hasFlippedBlocksWritingMode() const
-    {
-        return style()->isFlippedBlocksWritingMode();
-    }
-
-    bool hasLayer() const { return m_bitfields.hasLayer(); }
-
-    // "Box decoration background" includes all box decorations and backgrounds
-    // that are painted as the background of the object. It includes borders,
-    // box-shadows, background-color and background-image, etc.
-    enum BoxDecorationBackgroundState {
-        NoBoxDecorationBackground,
-        HasBoxDecorationBackgroundObscurationStatusInvalid,
-        HasBoxDecorationBackgroundKnownToBeObscured,
-        HasBoxDecorationBackgroundMayBeVisible,
-    };
-    bool hasBoxDecorationBackground() const { return m_bitfields.boxDecorationBackgroundState() != NoBoxDecorationBackground; }
-    bool boxDecorationBackgroundIsKnownToBeObscured();
-    bool canRenderBorderImage() const;
-    bool mustInvalidateBackgroundOrBorderPaintOnWidthChange() const;
-    bool mustInvalidateBackgroundOrBorderPaintOnHeightChange() const;
-    bool mustInvalidateFillLayersPaintOnWidthChange(const FillLayer&) const;
-    bool mustInvalidateFillLayersPaintOnHeightChange(const FillLayer&) const;
-    bool hasBackground() const { return style()->hasBackground(); }
-    bool hasEntirelyFixedBackground() const;
-
-    bool needsLayoutBecauseOfChildren() const { return needsLayout() && !selfNeedsLayout() && !needsPositionedMovementLayout() && !needsSimplifiedNormalFlowLayout(); }
-
-    bool needsLayout() const
-    {
-        return m_bitfields.selfNeedsLayout() || m_bitfields.normalChildNeedsLayout() || m_bitfields.posChildNeedsLayout()
-            || m_bitfields.needsSimplifiedNormalFlowLayout() || m_bitfields.needsPositionedMovementLayout();
-    }
-
-    bool selfNeedsLayout() const { return m_bitfields.selfNeedsLayout(); }
-    bool needsPositionedMovementLayout() const { return m_bitfields.needsPositionedMovementLayout(); }
-    bool needsPositionedMovementLayoutOnly() const
-    {
-        return m_bitfields.needsPositionedMovementLayout() && !m_bitfields.selfNeedsLayout() && !m_bitfields.normalChildNeedsLayout()
-            && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsSimplifiedNormalFlowLayout();
-    }
-
-    bool posChildNeedsLayout() const { return m_bitfields.posChildNeedsLayout(); }
-    bool needsSimplifiedNormalFlowLayout() const { return m_bitfields.needsSimplifiedNormalFlowLayout(); }
-    bool normalChildNeedsLayout() const { return m_bitfields.normalChildNeedsLayout(); }
-
-    bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }
-
-    bool needsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange() || m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
-    bool selfNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange(); }
-    bool childNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
-
-    bool isSelectionBorder() const;
-
-    bool hasClip() const { return isOutOfFlowPositioned() && !style()->hasAutoClip(); }
-    bool hasOverflowClip() const { return m_bitfields.hasOverflowClip(); }
-    bool hasClipOrOverflowClip() const { return hasClip() || hasOverflowClip(); }
-
-    bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); }
-    bool hasMask() const { return style() && style()->hasMask(); }
-    bool hasClipPath() const { return style() && style()->clipPath(); }
-    bool hasHiddenBackface() const { return style() && style()->backfaceVisibility() == BackfaceVisibilityHidden; }
-
-    bool hasFilter() const { return style() && style()->hasFilter(); }
-
-    bool hasShapeOutside() const { return style() && style()->shapeOutside(); }
-
-    inline bool preservesNewline() const;
-
-    // The pseudo element style can be cached or uncached.  Use the cached method if the pseudo element doesn't respect
-    // any pseudo classes (and therefore has no concept of changing state).
-    RenderStyle* getCachedPseudoStyle(PseudoId, RenderStyle* parentStyle = 0) const;
-    PassRefPtr<RenderStyle> getUncachedPseudoStyle(const PseudoStyleRequest&, RenderStyle* parentStyle = 0, RenderStyle* ownStyle = 0) const;
-
-    virtual void updateDragState(bool dragOn);
-
-    RenderView* view() const { return document().renderView(); };
-    FrameView* frameView() const { return document().view(); };
-
-    bool isRooted() const;
-
-    Node* node() const
-    {
-        return isAnonymous() ? 0 : m_node;
-    }
-
-    Node* nonPseudoNode() const
-    {
-        return isPseudoElement() ? 0 : node();
-    }
-
-    // FIXME: Why does RenderPart need this? crbug.com/422457
-    void clearNode() { m_node = nullptr; }
-
-    // Returns the styled node that caused the generation of this renderer.
-    // This is the same as node() except for renderers of :before, :after and
-    // :first-letter pseudo elements for which their parent node is returned.
-    Node* generatingNode() const { return isPseudoElement() ? node()->parentOrShadowHostNode() : node(); }
-
-    Document& document() const { return m_node->document(); }
-    LocalFrame* frame() const { return document().frame(); }
-
-    virtual RenderMultiColumnSpannerPlaceholder* spannerPlaceholder() const { return 0; }
-    bool isColumnSpanAll() const { return style()->columnSpan() == ColumnSpanAll && spannerPlaceholder(); }
-
-    // Returns the object containing this one. Can be different from parent for positioned elements.
-    // If paintInvalidationContainer and paintInvalidationContainerSkipped are not null, on return *paintInvalidationContainerSkipped
-    // is true if the renderer returned is an ancestor of paintInvalidationContainer.
-    RenderObject* container(const LayoutLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
-    RenderBlock* containerForFixedPosition(const LayoutLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
-
-    virtual RenderObject* hoverAncestor() const { return parent(); }
-
-    Element* offsetParent() const;
-
-    void markContainingBlocksForLayout(bool scheduleRelayout = true, RenderObject* newRoot = 0, SubtreeLayoutScope* = 0);
-    void setNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
-    void setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
-    void clearNeedsLayout();
-    void setChildNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
-    void setNeedsPositionedMovementLayout();
-    void setPreferredLogicalWidthsDirty(MarkingBehavior = MarkContainingBlockChain);
-    void clearPreferredLogicalWidthsDirty();
-    void invalidateContainerPreferredLogicalWidths();
-
-    void setNeedsLayoutAndPrefWidthsRecalc()
-    {
-        setNeedsLayout();
-        setPreferredLogicalWidthsDirty();
-    }
-    void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation()
-    {
-        setNeedsLayoutAndFullPaintInvalidation();
-        setPreferredLogicalWidthsDirty();
-    }
-
-    void setPositionState(EPosition position)
-    {
-        ASSERT((position != AbsolutePosition && position != FixedPosition) || isBox());
-        m_bitfields.setPositionedState(position);
-    }
-    void clearPositionedState() { m_bitfields.clearPositionedState(); }
-
-    void setFloating(bool isFloating) { m_bitfields.setFloating(isFloating); }
-    void setInline(bool isInline) { m_bitfields.setIsInline(isInline); }
-
-    void setHasBoxDecorationBackground(bool);
-    void invalidateBackgroundObscurationStatus();
-    virtual bool computeBackgroundIsKnownToBeObscured() { return false; }
-
-    void setIsText() { m_bitfields.setIsText(true); }
-    void setIsBox() { m_bitfields.setIsBox(true); }
-    void setReplaced(bool isReplaced) { m_bitfields.setIsReplaced(isReplaced); }
-    void setHorizontalWritingMode(bool hasHorizontalWritingMode) { m_bitfields.setHorizontalWritingMode(hasHorizontalWritingMode); }
-    void setHasOverflowClip(bool hasOverflowClip) { m_bitfields.setHasOverflowClip(hasOverflowClip); }
-    void setHasLayer(bool hasLayer) { m_bitfields.setHasLayer(hasLayer); }
-    void setHasTransformRelatedProperty(bool hasTransform) { m_bitfields.setHasTransformRelatedProperty(hasTransform); }
-    void setHasReflection(bool hasReflection) { m_bitfields.setHasReflection(hasReflection); }
-
-    void scheduleRelayout();
-
-    void updateFillImages(const FillLayer* oldLayers, const FillLayer& newLayers);
-    void updateImage(StyleImage*, StyleImage*);
-    void updateShapeImage(const ShapeValue*, const ShapeValue*);
-
-    // paintOffset is the offset from the origin of the GraphicsContext at which to paint the current object.
-    virtual void paint(const PaintInfo&, const LayoutPoint& paintOffset);
-
-    // Subclasses must reimplement this method to compute the size and position
-    // of this object and all its descendants.
-    virtual void layout() = 0;
-    virtual bool updateImageLoadingPriorities() { return false; }
-    void setHasPendingResourceUpdate(bool hasPendingResourceUpdate) { m_bitfields.setHasPendingResourceUpdate(hasPendingResourceUpdate); }
-    bool hasPendingResourceUpdate() const { return m_bitfields.hasPendingResourceUpdate(); }
-
-    /* This function performs a layout only if one is needed. */
-    void layoutIfNeeded() { if (needsLayout()) layout(); }
-
-    void forceLayout();
-    void forceChildLayout();
-
-    // Used for element state updates that cannot be fixed with a
-    // paint invalidation and do not need a relayout.
-    virtual void updateFromElement() { }
-
-    virtual void addAnnotatedRegions(Vector<AnnotatedRegionValue>&);
-    void collectAnnotatedRegions(Vector<AnnotatedRegionValue>&);
-
-    CompositingState compositingState() const;
-    virtual CompositingReasons additionalCompositingReasons() const;
-
-    bool hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter = HitTestAll);
-    virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&);
-    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
-
-    virtual PositionWithAffinity positionForPoint(const LayoutPoint&);
-    PositionWithAffinity createPositionWithAffinity(int offset, EAffinity);
-    PositionWithAffinity createPositionWithAffinity(const Position&);
-
-    virtual void dirtyLinesFromChangedChild(RenderObject*);
-
-    // Set the style of the object and update the state of the object accordingly.
-    void setStyle(PassRefPtr<RenderStyle>);
-
-    // Set the style of the object if it's generated content.
-    void setPseudoStyle(PassRefPtr<RenderStyle>);
-
-    // Updates only the local style ptr of the object.  Does not update the state of the object,
-    // and so only should be called when the style is known not to have changed (or from setStyle).
-    void setStyleInternal(PassRefPtr<RenderStyle> style) { m_style = style; }
-
-    // returns the containing block level element for this element.
-    RenderBlock* containingBlock() const;
-
-    bool canContainFixedPositionObjects() const
-    {
-        return isRenderView() || (hasTransformRelatedProperty() && isRenderBlock()) || isSVGForeignObject();
-    }
-
-    // Convert the given local point to absolute coordinates
-    // FIXME: Temporary. If UseTransforms is true, take transforms into account. Eventually localToAbsolute() will always be transform-aware.
-    FloatPoint localToAbsolute(const FloatPoint& localPoint = FloatPoint(), MapCoordinatesFlags = 0) const;
-    FloatPoint absoluteToLocal(const FloatPoint&, MapCoordinatesFlags = 0) const;
-
-    // Convert a local quad to absolute coordinates, taking transforms into account.
-    FloatQuad localToAbsoluteQuad(const FloatQuad& quad, MapCoordinatesFlags mode = 0, bool* wasFixed = 0) const
-    {
-        return localToContainerQuad(quad, 0, mode, wasFixed);
-    }
-    // Convert an absolute quad to local coordinates.
-    FloatQuad absoluteToLocalQuad(const FloatQuad&, MapCoordinatesFlags mode = 0) const;
-
-    // Convert a local quad into the coordinate system of container, taking transforms into account.
-    FloatQuad localToContainerQuad(const FloatQuad&, const LayoutLayerModelObject* paintInvalidatinoContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0) const;
-    FloatPoint localToContainerPoint(const FloatPoint&, const LayoutLayerModelObject* paintInvalidationContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0, const PaintInvalidationState* = 0) const;
-
-    // Convert a local point into the coordinate system of backing coordinates. Also returns the backing layer if needed.
-    FloatPoint localToInvalidationBackingPoint(const LayoutPoint&, Layer** backingLayer = nullptr);
-
-    // Return the offset from the container() renderer (excluding transforms). In multi-column layout,
-    // different offsets apply at different points, so return the offset that applies to the given point.
-    virtual LayoutSize offsetFromContainer(const RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const;
-    // Return the offset from an object up the container() chain. Asserts that none of the intermediate objects have transforms.
-    LayoutSize offsetFromAncestorContainer(const RenderObject*) const;
-
-    virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const { }
-
-    IntRect absoluteBoundingBoxRect() const;
-    // FIXME: This function should go away eventually
-    IntRect absoluteBoundingBoxRectIgnoringTransforms() const;
-
-    // Build an array of quads in absolute coords for line boxes
-    virtual void absoluteQuads(Vector<FloatQuad>&, bool* /*wasFixed*/ = 0) const { }
-
-    virtual IntRect absoluteFocusRingBoundingBoxRect() const;
-
-    static FloatRect absoluteBoundingBoxRectForRange(const Range*);
-
-    // the rect that will be painted if this object is passed as the paintingRoot
-    LayoutRect paintingRootRect(LayoutRect& topLevelRect);
-
-    virtual LayoutUnit minPreferredLogicalWidth() const { return 0; }
-    virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }
-
-    RenderStyle* style() const { return m_style.get(); }
-
-    // m_style can only be nullptr before the first style is set, thus most
-    // callers will never see a nullptr style and should use styleRef().
-    // FIXME: It would be better if style() returned a const reference.
-    const RenderStyle& styleRef() const { ASSERT(m_style); return *m_style; }
-
-    /* The following methods are inlined in RenderObjectInlines.h */
-    RenderStyle* firstLineStyle() const;
-    RenderStyle* style(bool firstLine) const;
-    const RenderStyle& styleRef(bool firstLine) const;
-
-    static inline Color resolveColor(const RenderStyle& styleToUse, int colorProperty)
-    {
-        return styleToUse.visitedDependentColor(colorProperty);
-    }
-
-    inline Color resolveColor(int colorProperty) const
-    {
-        return style()->visitedDependentColor(colorProperty);
-    }
-
-    // Used only by Element::pseudoStyleCacheIsInvalid to get a first line style based off of a
-    // given new style, without accessing the cache.
-    PassRefPtr<RenderStyle> uncachedFirstLineStyle(RenderStyle*) const;
-
-    virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
-
-    struct AppliedTextDecoration {
-        Color color;
-        TextDecorationStyle style;
-        AppliedTextDecoration() : color(Color::transparent), style(TextDecorationStyleSolid) { }
-    };
-
-    void getTextDecorations(unsigned decorations, AppliedTextDecoration& underline, AppliedTextDecoration& overline, AppliedTextDecoration& linethrough, bool quirksMode = false, bool firstlineStyle = false);
-
-    // Return the LayoutLayerModelObject in the container chain which is responsible for painting this object, or 0
-    // if painting is root-relative. This is the container that should be passed to the 'forPaintInvalidation'
-    // methods.
-    const LayoutLayerModelObject* containerForPaintInvalidation() const;
-    const LayoutLayerModelObject* adjustCompositedContainerForSpecialAncestors(const LayoutLayerModelObject* paintInvalidationContainer) const;
-    bool isPaintInvalidationContainer() const;
-
-    LayoutRect computePaintInvalidationRect()
-    {
-        return computePaintInvalidationRect(containerForPaintInvalidation());
-    }
-
-    // Returns the paint invalidation rect for this RenderObject in the coordinate space of the paint backing (typically a GraphicsLayer) for |paintInvalidationContainer|.
-    LayoutRect computePaintInvalidationRect(const LayoutLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
-
-    // Returns the rect bounds needed to invalidate the paint of this object, in the coordinate space of the rendering backing of |paintInvalidationContainer|
-    LayoutRect boundsRectForPaintInvalidation(const LayoutLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
-
-    // Actually do the paint invalidate of rect r for this object which has been computed in the coordinate space
-    // of the GraphicsLayer backing of |paintInvalidationContainer|. Note that this coordinaten space is not the same
-    // as the local coordinate space of |paintInvalidationContainer| in the presence of layer squashing.
-    // If |paintInvalidationContainer| is 0, invalidate paints via the view.
-    // FIXME: |paintInvalidationContainer| should never be 0. See crbug.com/363699.
-    void invalidatePaintUsingContainer(const LayoutLayerModelObject* paintInvalidationContainer, const LayoutRect&, PaintInvalidationReason) const;
-
-    // Invalidate the paint of a specific subrectangle within a given object. The rect |r| is in the object's coordinate space.
-    void invalidatePaintRectangle(const LayoutRect&) const;
-
-    void invalidateSelectionIfNeeded(const LayoutLayerModelObject&, PaintInvalidationReason);
-
-    // Walk the tree after layout issuing paint invalidations for renderers that have changed or moved, updating bounds that have changed, and clearing paint invalidation state.
-    virtual void invalidateTreeIfNeeded(const PaintInvalidationState&);
-
-    virtual void invalidatePaintForOverflow();
-    void invalidatePaintForOverflowIfNeeded();
-
-    void invalidatePaintIncludingNonCompositingDescendants();
-
-    // Returns the rect that should have paint invalidated whenever this object changes. The rect is in the view's
-    // coordinate space. This method deals with outlines and overflow.
-    virtual LayoutRect absoluteClippedOverflowRect() const;
-    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
-    virtual LayoutRect rectWithOutlineForPaintInvalidation(const LayoutLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const;
-
-    // Given a rect in the object's coordinate space, compute a rect suitable for invalidating paints of
-    // that rect in the coordinate space of paintInvalidationContainer.
-    virtual void mapRectToPaintInvalidationBacking(const LayoutLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const;
-
-    // Return the offset to the column in which the specified point (in flow-thread coordinates)
-    // lives. This is used to convert a flow-thread point to a visual point.
-    virtual LayoutSize columnOffset(const LayoutPoint&) const { return LayoutSize(); }
-
-    virtual unsigned length() const { return 1; }
-
-    bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
-
-    bool isTransparent() const { return style()->hasOpacity(); }
-    float opacity() const { return style()->opacity(); }
-
-    bool hasReflection() const { return m_bitfields.hasReflection(); }
-
-    enum SelectionState {
-        SelectionNone, // The object is not selected.
-        SelectionStart, // The object either contains the start of a selection run or is the start of a run
-        SelectionInside, // The object is fully encompassed by a selection run
-        SelectionEnd, // The object either contains the end of a selection run or is the end of a run
-        SelectionBoth // The object contains an entire run or is the sole selected object in that run
-    };
-
-    // The current selection state for an object.  For blocks, the state refers to the state of the leaf
-    // descendants (as described above in the SelectionState enum declaration).
-    SelectionState selectionState() const { return m_bitfields.selectionState(); }
-    virtual void setSelectionState(SelectionState state) { m_bitfields.setSelectionState(state); }
-    inline void setSelectionStateIfNeeded(SelectionState);
-    bool canUpdateSelectionOnRootLineBoxes() const;
-
-    // A single rectangle that encompasses all of the selected objects within this object.  Used to determine the tightest
-    // possible bounding box for the selection. The rect returned is in the coordinate space of the paint invalidation container's backing.
-    virtual LayoutRect selectionRectForPaintInvalidation(const LayoutLayerModelObject* /*paintInvalidationContainer*/) const { return LayoutRect(); }
-
-    virtual bool canBeSelectionLeaf() const { return false; }
-    bool hasSelectedChildren() const { return selectionState() != SelectionNone; }
-
-    bool isSelectable() const;
-    // Obtains the selection colors that should be used when painting a selection.
-    Color selectionBackgroundColor() const;
-    Color selectionForegroundColor() const;
-    Color selectionEmphasisMarkColor() const;
-
-    // Whether or not a given block needs to paint selection gaps.
-    virtual bool shouldPaintSelectionGaps() const { return false; }
-
-    /**
-     * Returns the local coordinates of the caret within this render object.
-     * @param caretOffset zero-based offset determining position within the render object.
-     * @param extraWidthToEndOfLine optional out arg to give extra width to end of line -
-     * useful for character range rect computations
-     */
-    virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0);
-
-    // When performing a global document tear-down, the renderer of the document is cleared. We use this
-    // as a hook to detect the case of document destruction and don't waste time doing unnecessary work.
-    bool documentBeingDestroyed() const;
-
-    void destroyAndCleanupAnonymousWrappers();
-    virtual void destroy();
-
-    // Virtual function helpers for the deprecated Flexible Box Layout (display: -webkit-box).
-    virtual bool isDeprecatedFlexibleBox() const { return false; }
-
-    // Virtual function helper for the new FlexibleBox Layout (display: -webkit-flex).
-    virtual bool isFlexibleBox() const { return false; }
-
-    bool isFlexibleBoxIncludingDeprecated() const
-    {
-        return isFlexibleBox() || isDeprecatedFlexibleBox();
-    }
-
-    virtual bool isCombineText() const { return false; }
-
-    virtual int caretMinOffset() const;
-    virtual int caretMaxOffset() const;
-
-    virtual int previousOffset(int current) const;
-    virtual int previousOffsetForBackwardDeletion(int current) const;
-    virtual int nextOffset(int current) const;
-
-    virtual void imageChanged(ImageResource*, const IntRect* = 0) override final;
-    virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) { }
-    virtual bool willRenderImage(ImageResource*) override final;
-    virtual bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) override final;
-
-    void selectionStartEnd(int& spos, int& epos) const;
-
-    void remove() { if (parent()) parent()->removeChild(this); }
-
-    bool isInert() const;
-
-    bool supportsTouchAction() const;
-
-    bool visibleToHitTestRequest(const HitTestRequest& request) const { return style()->visibility() == VISIBLE && (request.ignorePointerEventsNone() || style()->pointerEvents() != PE_NONE) && !isInert(); }
-
-    bool visibleToHitTesting() const { return style()->visibility() == VISIBLE && style()->pointerEvents() != PE_NONE && !isInert(); }
-
-    // Map points and quads through elements, potentially via 3d transforms. You should never need to call these directly; use
-    // localToAbsolute/absoluteToLocal methods instead.
-    virtual void mapLocalToContainer(const LayoutLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0, const PaintInvalidationState* = 0) const;
-    virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const;
-
-    // Pushes state onto RenderGeometryMap about how to map coordinates from this renderer to its container, or ancestorToStopAt (whichever is encountered first).
-    // Returns the renderer which was mapped to (container or ancestorToStopAt).
-    virtual const RenderObject* pushMappingToContainer(const LayoutLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const;
-
-    bool shouldUseTransformFromContainer(const RenderObject* container) const;
-    void getTransformFromContainer(const RenderObject* container, const LayoutSize& offsetInContainer, TransformationMatrix&) const;
-
-    bool createsGroup() const { return isTransparent() || hasMask() || hasFilter() || style()->hasBlendMode(); }
-
-    virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset) const { }
-
-    // Compute a list of hit-test rectangles per layer rooted at this renderer.
-    virtual void computeLayerHitTestRects(LayerHitTestRects&) const;
-
-    // Return the renderer whose background style is used to paint the root background. Should only be called on the renderer for which isDocumentElement() is true.
-    RenderObject* rendererForRootBackground();
-
-    RespectImageOrientationEnum shouldRespectImageOrientation() const;
-
-    bool isRelayoutBoundaryForInspector() const;
-
-    // The previous paint invalidation rect in the object's previous paint backing.
-    const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
-    void setPreviousPaintInvalidationRect(const LayoutRect& rect) { m_previousPaintInvalidationRect = rect; }
-
-    // The previous position of the top-left corner of the object in its previous paint backing.
-    const LayoutPoint& previousPositionFromPaintInvalidationBacking() const { return m_previousPositionFromPaintInvalidationBacking; }
-    void setPreviousPositionFromPaintInvalidationBacking(const LayoutPoint& positionFromPaintInvalidationBacking) { m_previousPositionFromPaintInvalidationBacking = positionFromPaintInvalidationBacking; }
-
-    bool shouldDoFullPaintInvalidation() const { return m_bitfields.fullPaintInvalidationReason() != PaintInvalidationNone; }
-    void setShouldDoFullPaintInvalidation(PaintInvalidationReason = PaintInvalidationFull);
-    void clearShouldDoFullPaintInvalidation() { m_bitfields.setFullPaintInvalidationReason(PaintInvalidationNone); }
-
-    bool shouldInvalidateOverflowForPaint() const { return m_bitfields.shouldInvalidateOverflowForPaint(); }
-
-    virtual void clearPaintInvalidationState(const PaintInvalidationState&);
-
-    // Indicates whether this render object was re-laid-out since the last frame.
-    // The flag will be cleared during invalidateTreeIfNeeded.
-    bool layoutDidGetCalledSinceLastFrame() const { return m_bitfields.layoutDidGetCalledSinceLastFrame(); }
-
-    bool mayNeedPaintInvalidation() const { return m_bitfields.mayNeedPaintInvalidation(); }
-    void setMayNeedPaintInvalidation();
-    void clearMayNeedPaintInvalidation();
-
-    bool shouldInvalidateSelection() const { return m_bitfields.shouldInvalidateSelection(); }
-    void setShouldInvalidateSelection()
-    {
-        if (!canUpdateSelectionOnRootLineBoxes())
-            return;
-
-        m_bitfields.setShouldInvalidateSelection(true);
-        markContainingBlockChainForPaintInvalidation();
-    }
-    void clearShouldInvalidateSelection() { m_bitfields.setShouldInvalidateSelection(false); }
-
-    bool neededLayoutBecauseOfChildren() const { return m_bitfields.neededLayoutBecauseOfChildren(); }
-    void setNeededLayoutBecauseOfChildren(bool b) { m_bitfields.setNeededLayoutBecauseOfChildren(b); }
-
-    bool shouldCheckForPaintInvalidation(const PaintInvalidationState& paintInvalidationState) const
-    {
-        return paintInvalidationState.forceCheckForPaintInvalidation() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
-    }
-
-    bool shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() const
-    {
-        return layoutDidGetCalledSinceLastFrame() || mayNeedPaintInvalidation() || shouldDoFullPaintInvalidation() || shouldInvalidateSelection();
-    }
-
-    virtual bool supportsPaintInvalidationStateCachedOffsets() const { return !hasColumns() && !hasTransformRelatedProperty() && !hasReflection() && !style()->isFlippedBlocksWritingMode(); }
-
-    void setNeedsOverflowRecalcAfterStyleChange();
-    void markContainingBlocksForOverflowRecalc();
-
-    virtual LayoutRect viewRect() const;
-
-    DisplayItemClient displayItemClient() const { return toDisplayItemClient(this); }
-
-protected:
-    enum RenderObjectType {
-        RenderObjectBr,
-        RenderObjectCanvas,
-        RenderObjectFieldset,
-        RenderObjectCounter,
-        RenderObjectDetailsMarker,
-        RenderObjectEmbeddedObject,
-        RenderObjectFileUploadControl,
-        RenderObjectFrame,
-        RenderObjectFrameSet,
-        RenderObjectLayoutTableCol,
-        RenderObjectListBox,
-        RenderObjectListItem,
-        RenderObjectListMarker,
-        RenderObjectMedia,
-        RenderObjectMenuList,
-        RenderObjectMeter,
-        RenderObjectProgress,
-        RenderObjectQuote,
-        RenderObjectRenderButton,
-        RenderObjectRenderFlowThread,
-        RenderObjectRenderFullScreen,
-        RenderObjectRenderFullScreenPlaceholder,
-        RenderObjectRenderGrid,
-        RenderObjectRenderIFrame,
-        RenderObjectRenderImage,
-        RenderObjectRenderInline,
-        RenderObjectRenderMultiColumnSet,
-        RenderObjectRenderMultiColumnSpannerPlaceholder,
-        RenderObjectRenderPart,
-        RenderObjectRenderRegion,
-        RenderObjectRenderScrollbarPart,
-        RenderObjectRenderView,
-        RenderObjectReplica,
-        RenderObjectRuby,
-        RenderObjectRubyBase,
-        RenderObjectRubyRun,
-        RenderObjectRubyText,
-        RenderObjectSlider,
-        RenderObjectSliderThumb,
-        RenderObjectTable,
-        RenderObjectTableCaption,
-        RenderObjectTableCell,
-        RenderObjectTableRow,
-        RenderObjectTableSection,
-        RenderObjectTextArea,
-        RenderObjectTextControl,
-        RenderObjectTextField,
-        RenderObjectVideo,
-        RenderObjectWidget,
-
-        RenderObjectSVG, /* Keep by itself? */
-        RenderObjectSVGRoot,
-        RenderObjectSVGContainer,
-        RenderObjectSVGTransformableContainer,
-        RenderObjectSVGViewportContainer,
-        RenderObjectSVGHiddenContainer,
-        RenderObjectSVGGradientStop,
-        RenderObjectSVGShape,
-        RenderObjectSVGText,
-        RenderObjectSVGTextPath,
-        RenderObjectSVGInline,
-        RenderObjectSVGInlineText,
-        RenderObjectSVGImage,
-        RenderObjectSVGForeignObject,
-        RenderObjectSVGResourceContainer,
-        RenderObjectSVGResourceFilter,
-        RenderObjectSVGResourceFilterPrimitive,
-    };
-    virtual bool isOfType(RenderObjectType type) const { return false; }
-
-    inline bool layerCreationAllowedForSubtree() const;
-
-    // Overrides should call the superclass at the end. m_style will be 0 the first time
-    // this function will be called.
-    virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle);
-    // Overrides should call the superclass at the start. |oldStyle| will be 0 the first
-    // time this function is called.
-    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
-    void propagateStyleToAnonymousChildren(bool blockChildrenOnly = false);
-    virtual void updateAnonymousChildStyle(const RenderObject* child, RenderStyle* style) const { }
-
-protected:
-    void setSelfMayNeedPaintInvalidation();
-
-    void clearLayoutRootIfNeeded() const;
-    virtual void willBeDestroyed();
-    void postDestroy();
-
-    virtual void insertedIntoTree();
-    virtual void willBeRemovedFromTree();
-
-    void setDocumentForAnonymous(Document* document) { ASSERT(isAnonymous()); m_node = document; }
-
-    // Add hit-test rects for the render tree rooted at this node to the provided collection on a
-    // per-Layer basis.
-    // currentLayer must be the enclosing layer, and layerOffset is the current offset within
-    // this layer. Subclass implementations will add any offset for this renderer within it's
-    // container, so callers should provide only the offset of the container within it's layer.
-    // containerRect is a rect that has already been added for the currentLayer which is likely to
-    // be a container for child elements. Any rect wholly contained by containerRect can be
-    // skipped.
-    virtual void addLayerHitTestRects(LayerHitTestRects&, const Layer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const;
-
-    // Add hit-test rects for this renderer only to the provided list. layerOffset is the offset
-    // of this renderer within the current layer that should be used for each result.
-    virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const { };
-
-    virtual PaintInvalidationReason paintInvalidationReason(const LayoutLayerModelObject& paintInvalidationContainer,
-        const LayoutRect& oldPaintInvalidationRect, const LayoutPoint& oldPositionFromPaintInvalidationBacking,
-        const LayoutRect& newPaintInvalidationRect, const LayoutPoint& newPositionFromPaintInvalidationBacking) const;
-    virtual void incrementallyInvalidatePaint(const LayoutLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationBacking);
-    void fullyInvalidatePaint(const LayoutLayerModelObject& paintInvalidationContainer, PaintInvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
-
-#if ENABLE(ASSERT)
-    virtual bool paintInvalidationStateIsDirty() const
-    {
-        return neededLayoutBecauseOfChildren() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
-    }
-#endif
-
-    virtual void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState);
-    virtual PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const LayoutLayerModelObject& paintInvalidationContainer);
-
-    // When this object is invalidated for paint, this method is called to invalidate any DisplayItemClients
-    // owned by this object, including the object itself, RenderText/RenderInline line boxes, scrollbars, etc.,
-    // not including children which will be invalidated normally during invalidateTreeIfNeeded().
-    virtual void invalidateDisplayItemClients(DisplayItemList*) const;
-
-private:
-    void setLayoutDidGetCalledSinceLastFrame()
-    {
-        m_bitfields.setLayoutDidGetCalledSinceLastFrame(true);
-
-        // Make sure our parent is marked as needing invalidation.
-        // This would be unneeded if we allowed sub-tree invalidation (akin to sub-tree layouts).
-        markContainingBlockChainForPaintInvalidation();
-    }
-    void clearLayoutDidGetCalledSinceLastFrame() { m_bitfields.setLayoutDidGetCalledSinceLastFrame(false); }
-
-    void invalidatePaintIncludingNonCompositingDescendantsInternal(const LayoutLayerModelObject* repaintContainer);
-
-    LayoutRect previousSelectionRectForPaintInvalidation() const;
-    void setPreviousSelectionRectForPaintInvalidation(const LayoutRect&);
-
-    const LayoutLayerModelObject* enclosingCompositedContainer() const;
-
-    RenderFlowThread* locateFlowThreadContainingBlock() const;
-    void removeFromRenderFlowThread();
-    void removeFromRenderFlowThreadRecursive(RenderFlowThread*);
-
-    RenderStyle* cachedFirstLineStyle() const;
-    StyleDifference adjustStyleDifference(StyleDifference) const;
-
-    Color selectionColor(int colorProperty) const;
-
-    void removeShapeImageClient(ShapeValue*);
-
-#if ENABLE(ASSERT)
-    void checkBlockPositionedObjectsNeedLayout();
-#endif
-
-    void markContainingBlockChainForPaintInvalidation();
-
-    static bool isAllowedToModifyRenderTreeStructure(Document&);
-
-    RefPtr<RenderStyle> m_style;
-
-    // Oilpan: raw pointer back to the owning Node is considered safe.
-    Node* m_node;
-
-    RenderObject* m_parent;
-    RenderObject* m_previous;
-    RenderObject* m_next;
-
-#if ENABLE(ASSERT)
-    unsigned m_hasAXObject             : 1;
-    unsigned m_setNeedsLayoutForbidden : 1;
-#endif
-
-#define ADD_BOOLEAN_BITFIELD(name, Name) \
-    private:\
-        unsigned m_##name : 1;\
-    public:\
-        bool name() const { return m_##name; }\
-        void set##Name(bool name) { m_##name = name; }\
-
-    class RenderObjectBitfields {
-        enum PositionedState {
-            IsStaticallyPositioned = 0,
-            IsRelativelyPositioned = 1,
-            IsOutOfFlowPositioned = 2,
-        };
-
-    public:
-        RenderObjectBitfields(Node* node)
-            : m_selfNeedsLayout(false)
-            , m_shouldInvalidateOverflowForPaint(false)
-            // FIXME: We should remove mayNeedPaintInvalidation once we are able to
-            // use the other layout flags to detect the same cases. crbug.com/370118
-            , m_mayNeedPaintInvalidation(false)
-            , m_shouldInvalidateSelection(false)
-            , m_neededLayoutBecauseOfChildren(false)
-            , m_needsPositionedMovementLayout(false)
-            , m_normalChildNeedsLayout(false)
-            , m_posChildNeedsLayout(false)
-            , m_needsSimplifiedNormalFlowLayout(false)
-            , m_preferredLogicalWidthsDirty(false)
-            , m_floating(false)
-            , m_selfNeedsOverflowRecalcAfterStyleChange(false)
-            , m_childNeedsOverflowRecalcAfterStyleChange(false)
-            , m_isAnonymous(!node)
-            , m_isText(false)
-            , m_isBox(false)
-            , m_isInline(true)
-            , m_isReplaced(false)
-            , m_horizontalWritingMode(true)
-            , m_isDragging(false)
-            , m_hasLayer(false)
-            , m_hasOverflowClip(false)
-            , m_hasTransformRelatedProperty(false)
-            , m_hasReflection(false)
-            , m_hasCounterNodeMap(false)
-            , m_everHadLayout(false)
-            , m_ancestorLineBoxDirty(false)
-            , m_layoutDidGetCalledSinceLastFrame(false)
-            , m_hasPendingResourceUpdate(false)
-            , m_childrenInline(false)
-            , m_hasColumns(false)
-            , m_alwaysCreateLineBoxesForRenderInline(false)
-            , m_positionedState(IsStaticallyPositioned)
-            , m_selectionState(SelectionNone)
-            , m_flowThreadState(NotInsideFlowThread)
-            , m_boxDecorationBackgroundState(NoBoxDecorationBackground)
-            , m_fullPaintInvalidationReason(PaintInvalidationNone)
-        {
-        }
-
-        // 32 bits have been used in the first word, and 14 in the second.
-        ADD_BOOLEAN_BITFIELD(selfNeedsLayout, SelfNeedsLayout);
-        ADD_BOOLEAN_BITFIELD(shouldInvalidateOverflowForPaint, ShouldInvalidateOverflowForPaint);
-        ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidation, MayNeedPaintInvalidation);
-        ADD_BOOLEAN_BITFIELD(shouldInvalidateSelection, ShouldInvalidateSelection);
-        ADD_BOOLEAN_BITFIELD(neededLayoutBecauseOfChildren, NeededLayoutBecauseOfChildren);
-        ADD_BOOLEAN_BITFIELD(needsPositionedMovementLayout, NeedsPositionedMovementLayout);
-        ADD_BOOLEAN_BITFIELD(normalChildNeedsLayout, NormalChildNeedsLayout);
-        ADD_BOOLEAN_BITFIELD(posChildNeedsLayout, PosChildNeedsLayout);
-        ADD_BOOLEAN_BITFIELD(needsSimplifiedNormalFlowLayout, NeedsSimplifiedNormalFlowLayout);
-        ADD_BOOLEAN_BITFIELD(preferredLogicalWidthsDirty, PreferredLogicalWidthsDirty);
-        ADD_BOOLEAN_BITFIELD(floating, Floating);
-        ADD_BOOLEAN_BITFIELD(selfNeedsOverflowRecalcAfterStyleChange, SelfNeedsOverflowRecalcAfterStyleChange);
-        ADD_BOOLEAN_BITFIELD(childNeedsOverflowRecalcAfterStyleChange, ChildNeedsOverflowRecalcAfterStyleChange);
-
-        ADD_BOOLEAN_BITFIELD(isAnonymous, IsAnonymous);
-        ADD_BOOLEAN_BITFIELD(isText, IsText);
-        ADD_BOOLEAN_BITFIELD(isBox, IsBox);
-        ADD_BOOLEAN_BITFIELD(isInline, IsInline);
-        ADD_BOOLEAN_BITFIELD(isReplaced, IsReplaced);
-        ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode);
-        ADD_BOOLEAN_BITFIELD(isDragging, IsDragging);
-
-        ADD_BOOLEAN_BITFIELD(hasLayer, HasLayer);
-        ADD_BOOLEAN_BITFIELD(hasOverflowClip, HasOverflowClip); // Set in the case of overflow:auto/scroll/hidden
-        ADD_BOOLEAN_BITFIELD(hasTransformRelatedProperty, HasTransformRelatedProperty);
-        ADD_BOOLEAN_BITFIELD(hasReflection, HasReflection);
-
-        ADD_BOOLEAN_BITFIELD(hasCounterNodeMap, HasCounterNodeMap);
-        ADD_BOOLEAN_BITFIELD(everHadLayout, EverHadLayout);
-        ADD_BOOLEAN_BITFIELD(ancestorLineBoxDirty, AncestorLineBoxDirty);
-
-        ADD_BOOLEAN_BITFIELD(layoutDidGetCalledSinceLastFrame, LayoutDidGetCalledSinceLastFrame);
-
-        ADD_BOOLEAN_BITFIELD(hasPendingResourceUpdate, HasPendingResourceUpdate);
-
-        // from RenderBlock
-        ADD_BOOLEAN_BITFIELD(childrenInline, ChildrenInline);
-        ADD_BOOLEAN_BITFIELD(hasColumns, HasColumns);
-
-        // from RenderInline
-        ADD_BOOLEAN_BITFIELD(alwaysCreateLineBoxesForRenderInline, AlwaysCreateLineBoxesForRenderInline);
-
-    private:
-        unsigned m_positionedState : 2; // PositionedState
-        unsigned m_selectionState : 3; // SelectionState
-        unsigned m_flowThreadState : 2; // FlowThreadState
-        unsigned m_boxDecorationBackgroundState : 2; // BoxDecorationBackgroundState
-        unsigned m_fullPaintInvalidationReason : 5; // PaintInvalidationReason
-
-    public:
-        bool isOutOfFlowPositioned() const { return m_positionedState == IsOutOfFlowPositioned; }
-        bool isRelPositioned() const { return m_positionedState == IsRelativelyPositioned; }
-        bool isPositioned() const { return m_positionedState != IsStaticallyPositioned; }
-
-        void setPositionedState(int positionState)
-        {
-            // This mask maps FixedPosition and AbsolutePosition to IsOutOfFlowPositioned, saving one bit.
-            m_positionedState = static_cast<PositionedState>(positionState & 0x3);
-        }
-        void clearPositionedState() { m_positionedState = StaticPosition; }
-
-        ALWAYS_INLINE SelectionState selectionState() const { return static_cast<SelectionState>(m_selectionState); }
-        ALWAYS_INLINE void setSelectionState(SelectionState selectionState) { m_selectionState = selectionState; }
-
-        ALWAYS_INLINE FlowThreadState flowThreadState() const { return static_cast<FlowThreadState>(m_flowThreadState); }
-        ALWAYS_INLINE void setFlowThreadState(FlowThreadState flowThreadState) { m_flowThreadState = flowThreadState; }
-
-        ALWAYS_INLINE BoxDecorationBackgroundState boxDecorationBackgroundState() const { return static_cast<BoxDecorationBackgroundState>(m_boxDecorationBackgroundState); }
-        ALWAYS_INLINE void setBoxDecorationBackgroundState(BoxDecorationBackgroundState s) { m_boxDecorationBackgroundState = s; }
-
-        PaintInvalidationReason fullPaintInvalidationReason() const { return static_cast<PaintInvalidationReason>(m_fullPaintInvalidationReason); }
-        void setFullPaintInvalidationReason(PaintInvalidationReason reason) { m_fullPaintInvalidationReason = reason; }
-    };
-
-#undef ADD_BOOLEAN_BITFIELD
-
-    RenderObjectBitfields m_bitfields;
-
-    void setSelfNeedsLayout(bool b) { m_bitfields.setSelfNeedsLayout(b); }
-    void setNeedsPositionedMovementLayout(bool b) { m_bitfields.setNeedsPositionedMovementLayout(b); }
-    void setNormalChildNeedsLayout(bool b) { m_bitfields.setNormalChildNeedsLayout(b); }
-    void setPosChildNeedsLayout(bool b) { m_bitfields.setPosChildNeedsLayout(b); }
-    void setNeedsSimplifiedNormalFlowLayout(bool b) { m_bitfields.setNeedsSimplifiedNormalFlowLayout(b); }
-    void setIsDragging(bool b) { m_bitfields.setIsDragging(b); }
-    void setEverHadLayout(bool b) { m_bitfields.setEverHadLayout(b); }
-    void setShouldInvalidateOverflowForPaint(bool b) { m_bitfields.setShouldInvalidateOverflowForPaint(b); }
-    void setSelfNeedsOverflowRecalcAfterStyleChange(bool b) { m_bitfields.setSelfNeedsOverflowRecalcAfterStyleChange(b); }
-    void setChildNeedsOverflowRecalcAfterStyleChange(bool b) { m_bitfields.setChildNeedsOverflowRecalcAfterStyleChange(b); }
-
-private:
-    // Store state between styleWillChange and styleDidChange
-    static bool s_affectsParentBlock;
-
-    // This stores the paint invalidation rect from the previous frame.
-    LayoutRect m_previousPaintInvalidationRect;
-
-    // This stores the position in the paint invalidation backing's coordinate.
-    // It is used to detect renderer shifts that forces a full invalidation.
-    LayoutPoint m_previousPositionFromPaintInvalidationBacking;
-
-    static unsigned s_instanceCount;
-};
-
-// FIXME: remove this once the render object lifecycle ASSERTS are no longer hit.
-class DeprecatedDisableModifyRenderTreeStructureAsserts {
-    WTF_MAKE_NONCOPYABLE(DeprecatedDisableModifyRenderTreeStructureAsserts);
-public:
-    DeprecatedDisableModifyRenderTreeStructureAsserts();
-
-    static bool canModifyRenderTreeStateInAnyState();
-
-private:
-    TemporaryChange<bool> m_disabler;
-};
-
-// Allow equality comparisons of RenderObjects by reference or pointer, interchangeably.
-DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(RenderObject)
-
-inline bool RenderObject::documentBeingDestroyed() const
-{
-    return document().lifecycle().state() >= DocumentLifecycle::Stopping;
-}
-
-inline bool RenderObject::isBeforeContent() const
-{
-    if (style()->styleType() != BEFORE)
-        return false;
-    // Text nodes don't have their own styles, so ignore the style on a text node.
-    if (isText() && !isBR())
-        return false;
-    return true;
-}
-
-inline bool RenderObject::isAfterContent() const
-{
-    if (style()->styleType() != AFTER)
-        return false;
-    // Text nodes don't have their own styles, so ignore the style on a text node.
-    if (isText() && !isBR())
-        return false;
-    return true;
-}
-
-inline bool RenderObject::isBeforeOrAfterContent() const
-{
-    return isBeforeContent() || isAfterContent();
-}
-
-// setNeedsLayout() won't cause full paint invalidations as
-// setNeedsLayoutAndFullPaintInvalidation() does. Otherwise the two methods are identical.
-inline void RenderObject::setNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
-{
-    TRACE_EVENT_INSTANT1(
-        TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
-        "LayoutInvalidationTracking",
-        "data",
-        InspectorLayoutInvalidationTrackingEvent::data(this));
-    ASSERT(!isSetNeedsLayoutForbidden());
-    bool alreadyNeededLayout = m_bitfields.selfNeedsLayout();
-    setSelfNeedsLayout(true);
-    if (!alreadyNeededLayout) {
-        if (markParents == MarkContainingBlockChain && (!layouter || layouter->root() != this))
-            markContainingBlocksForLayout(true, 0, layouter);
-    }
-}
-
-inline void RenderObject::setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
-{
-    setNeedsLayout(markParents, layouter);
-    setShouldDoFullPaintInvalidation();
-}
-
-inline void RenderObject::clearNeedsLayout()
-{
-    setNeededLayoutBecauseOfChildren(needsLayoutBecauseOfChildren());
-    setLayoutDidGetCalledSinceLastFrame();
-    setSelfNeedsLayout(false);
-    setEverHadLayout(true);
-    setPosChildNeedsLayout(false);
-    setNeedsSimplifiedNormalFlowLayout(false);
-    setNormalChildNeedsLayout(false);
-    setNeedsPositionedMovementLayout(false);
-    setAncestorLineBoxDirty(false);
-#if ENABLE(ASSERT)
-    checkBlockPositionedObjectsNeedLayout();
-#endif
-}
-
-inline void RenderObject::setChildNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
-{
-    ASSERT(!isSetNeedsLayoutForbidden());
-    bool alreadyNeededLayout = normalChildNeedsLayout();
-    setNormalChildNeedsLayout(true);
-    // FIXME: Replace MarkOnlyThis with the SubtreeLayoutScope code path and remove the MarkingBehavior argument entirely.
-    if (!alreadyNeededLayout && markParents == MarkContainingBlockChain && (!layouter || layouter->root() != this))
-        markContainingBlocksForLayout(true, 0, layouter);
-}
-
-inline void RenderObject::setNeedsPositionedMovementLayout()
-{
-    bool alreadyNeededLayout = needsPositionedMovementLayout();
-    setNeedsPositionedMovementLayout(true);
-    ASSERT(!isSetNeedsLayoutForbidden());
-    if (!alreadyNeededLayout)
-        markContainingBlocksForLayout();
-}
-
-inline bool RenderObject::preservesNewline() const
-{
-    if (isSVGInlineText())
-        return false;
-
-    return style()->preserveNewline();
-}
-
-inline bool RenderObject::layerCreationAllowedForSubtree() const
-{
-    RenderObject* parentRenderer = parent();
-    while (parentRenderer) {
-        if (parentRenderer->isSVGHiddenContainer())
-            return false;
-        parentRenderer = parentRenderer->parent();
-    }
-
-    return true;
-}
-
-inline void RenderObject::setSelectionStateIfNeeded(SelectionState state)
-{
-    if (selectionState() == state)
-        return;
-
-    setSelectionState(state);
-}
-
-inline void RenderObject::setHasBoxDecorationBackground(bool b)
-{
-    if (!b) {
-        m_bitfields.setBoxDecorationBackgroundState(NoBoxDecorationBackground);
-        return;
-    }
-    if (hasBoxDecorationBackground())
-        return;
-    m_bitfields.setBoxDecorationBackgroundState(HasBoxDecorationBackgroundObscurationStatusInvalid);
-}
-
-inline void RenderObject::invalidateBackgroundObscurationStatus()
-{
-    if (!hasBoxDecorationBackground())
-        return;
-    m_bitfields.setBoxDecorationBackgroundState(HasBoxDecorationBackgroundObscurationStatusInvalid);
-}
-
-inline bool RenderObject::boxDecorationBackgroundIsKnownToBeObscured()
-{
-    if (m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundObscurationStatusInvalid) {
-        BoxDecorationBackgroundState state = computeBackgroundIsKnownToBeObscured() ? HasBoxDecorationBackgroundKnownToBeObscured : HasBoxDecorationBackgroundMayBeVisible;
-        m_bitfields.setBoxDecorationBackgroundState(state);
-    }
-    return m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundKnownToBeObscured;
-}
-
-inline void makeMatrixRenderable(TransformationMatrix& matrix, bool has3DRendering)
-{
-    if (!has3DRendering)
-        matrix.makeAffine();
-}
-
-inline int adjustForAbsoluteZoom(int value, RenderObject* renderer)
-{
-    return adjustForAbsoluteZoom(value, renderer->style());
-}
-
-inline double adjustDoubleForAbsoluteZoom(double value, RenderObject& renderer)
-{
-    ASSERT(renderer.style());
-    return adjustDoubleForAbsoluteZoom(value, *renderer.style());
-}
-
-inline LayoutUnit adjustLayoutUnitForAbsoluteZoom(LayoutUnit value, RenderObject& renderer)
-{
-    ASSERT(renderer.style());
-    return adjustLayoutUnitForAbsoluteZoom(value, *renderer.style());
-}
-
-inline void adjustFloatQuadForAbsoluteZoom(FloatQuad& quad, RenderObject& renderer)
-{
-    float zoom = renderer.style()->effectiveZoom();
-    if (zoom != 1)
-        quad.scale(1 / zoom, 1 / zoom);
-}
-
-inline void adjustFloatRectForAbsoluteZoom(FloatRect& rect, RenderObject& renderer)
-{
-    float zoom = renderer.style()->effectiveZoom();
-    if (zoom != 1)
-        rect.scale(1 / zoom, 1 / zoom);
-}
-
-inline double adjustScrollForAbsoluteZoom(double value, RenderObject& renderer)
-{
-    ASSERT(renderer.style());
-    return adjustScrollForAbsoluteZoom(value, *renderer.style());
-}
-
-#define DEFINE_RENDER_OBJECT_TYPE_CASTS(thisType, predicate) \
-    DEFINE_TYPE_CASTS(thisType, RenderObject, object, object->predicate, object.predicate)
-
-} // namespace blink
-
-#ifndef NDEBUG
-// Outside the WebCore namespace for ease of invocation from gdb.
-void showTree(const blink::RenderObject*);
-void showLineTree(const blink::RenderObject*);
-void showRenderTree(const blink::RenderObject* object1);
-// We don't make object2 an optional parameter so that showRenderTree
-// can be called from gdb easily.
-void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
-
-#endif
-
-#endif // RenderObject_h