/*
 * 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) 2003-2022 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.
 *
 */

#pragma once

#include "CachedImageClient.h"
#include "Element.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "FrameDestructionObserverInlines.h"
#include "HTMLNames.h"
#include "InspectorInstrumentationPublic.h"
#include "LayoutRect.h"
#include "Page.h"
#include "RenderObjectEnums.h"
#include "RenderStyle.h"
#include "ScrollAlignment.h"
#include "StyleImage.h"
#include "TextAffinity.h"
#include <wtf/CheckedPtr.h>
#include <wtf/IsoMalloc.h>

namespace WTF {
class TextStream;
}

namespace WebCore {

class AffineTransform;
class Color;
class ControlPart;
class Cursor;
class Document;
class HitTestLocation;
class HitTestRequest;
class HitTestResult;
class HostWindow;
class LegacyInlineBox;
class Path;
class Position;
class ReferencedSVGResources;
class RenderBoxModelObject;
class RenderInline;
class RenderBlock;
class RenderBlockFlow;
class RenderElement;
class RenderFragmentedFlow;
class RenderGeometryMap;
class RenderLayer;
class RenderLayerModelObject;
class RenderFragmentContainer;
class RenderTheme;
class RenderTreeBuilder;
class HighlightData;
class TransformState;
class VisiblePosition;

#if PLATFORM(IOS_FAMILY)
class SelectionGeometry;
#endif

struct InlineBoxAndOffset;
struct PaintInfo;
struct SimpleRange;

struct ScrollRectToVisibleOptions;

namespace Layout {
class Box;
}

namespace Style {
class PseudoElementRequest;
}

// Base class for all rendering tree objects.
class RenderObject : public CachedImageClient {
    WTF_MAKE_ISO_ALLOCATED(RenderObject);
    friend class RenderBlock;
    friend class RenderBlockFlow;
    friend class RenderBox;
    friend class RenderElement;
    friend class RenderLayer;
    friend class RenderLayerScrollableArea;
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();

    Layout::Box* layoutBox() { return m_layoutBox.get(); }
    const Layout::Box* layoutBox() const { return m_layoutBox.get(); }
    void setLayoutBox(Layout::Box&);
    void clearLayoutBox();

    RenderTheme& theme() const;

    virtual ASCIILiteral renderName() const = 0;

    RenderElement* parent() const { return m_parent; }
    bool isDescendantOf(const RenderObject*) const;

    RenderObject* previousSibling() const { return m_previous; }
    RenderObject* nextSibling() const { return m_next; }
    RenderObject* previousInFlowSibling() const;
    RenderObject* nextInFlowSibling() const;

    // Use RenderElement versions instead.
    virtual RenderObject* firstChildSlow() const { return nullptr; }
    virtual RenderObject* lastChildSlow() const { return nullptr; }

    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;
    WEBCORE_EXPORT RenderObject* childAt(unsigned) const;

    RenderObject* firstLeafChild() const;
    RenderObject* lastLeafChild() const;

    RenderElement* firstNonAnonymousAncestor() const;

#if ENABLE(TEXT_AUTOSIZING)
    // Minimal distance between the block with fixed height and overflowing content and the text block to apply text autosizing.
    // The greater this constant is the more potential places we have where autosizing is turned off.
    // So it should be as low as possible. There are sites that break at 2.
    static const int TextAutoSizingFixedHeightDepth = 3;

    enum BlockContentHeightType {
        FixedHeight,
        FlexibleHeight,
        OverflowHeight
    };

    typedef BlockContentHeightType (*HeightTypeTraverseNextInclusionFunction)(const RenderObject&);
    RenderObject* traverseNext(const RenderObject* stayWithin, HeightTypeTraverseNextInclusionFunction, int& currentDepth, int& newFixedDepth) const;
#endif

    WEBCORE_EXPORT RenderLayer* enclosingLayer() const;

    WEBCORE_EXPORT RenderBox& enclosingBox() const;
    RenderBoxModelObject& enclosingBoxModelObject() const;
    RenderBox* enclosingScrollableContainerForSnapping() const;

    // Return our enclosing flow thread if we are contained inside one. Follows the containing block chain.
    RenderFragmentedFlow* enclosingFragmentedFlow() const;

    WEBCORE_EXPORT bool useDarkAppearance() const;
    OptionSet<StyleColorOptions> styleColorOptions() const;

#if ASSERT_ENABLED
    void setHasAXObject(bool flag) { m_hasAXObject = flag; }
    bool hasAXObject() const { return m_hasAXObject; }
#endif

    // Creates a scope where this object will assert on calls to setNeedsLayout().
    class SetLayoutNeededForbiddenScope;
    
    // RenderObject tree manipulation
    //////////////////////////////////////////
    virtual bool canHaveChildren() const = 0;
    virtual bool canHaveGeneratedChildren() const;
    virtual bool createsAnonymousWrapper() const { return false; }
    //////////////////////////////////////////

#if ENABLE(TREE_DEBUGGING)
    void showNodeTreeForThis() const;
    void showRenderTreeForThis() const;
    void showLineTreeForThis() const;

    void outputRenderObject(WTF::TextStream&, bool mark, int depth) const;
    void outputRenderSubTreeAndMark(WTF::TextStream&, const RenderObject* markedObject, int depth) const;
    void outputRegionsInformation(WTF::TextStream&) const;
#endif

    bool isPseudoElement() const { return node() && node()->isPseudoElement(); }

    bool isRenderElement() const { return !isText(); }
    bool isRenderReplaced() const;
    bool isBoxModelObject() const;
    bool isRenderBlock() const;
    bool isRenderBlockFlow() const;
    bool isRenderInline() const;
    bool isRenderLayerModelObject() const;

    bool isAtomicInlineLevelBox() const;

    virtual bool isCounter() const { return false; }
    virtual bool isQuote() const { return false; }

    virtual bool isDetailsMarker() const { return false; }
    virtual bool isEmbeddedObject() const { return false; }
    bool isFieldset() const;
    virtual bool isFileUploadControl() const { return false; }
    virtual bool isFrame() const { return false; }
    virtual bool isFrameSet() const { return false; }
    virtual bool isImage() const { return false; }
    virtual bool isInlineBlockOrInlineTable() const { return false; }
    virtual bool isListBox() const { return false; }
    virtual bool isListItem() const { return false; }
    virtual bool isListMarker() const { return false; }
    virtual bool isMedia() const { return false; }
    virtual bool isMenuList() const { return false; }
    virtual bool isMeter() const { return false; }
    virtual bool isProgress() const { return false; }
    virtual bool isRenderButton() const { return false; }
    virtual bool isRenderIFrame() const { return false; }
    virtual bool isRenderImage() const { return false; }
#if ENABLE(MODEL_ELEMENT)
    virtual bool isRenderModel() const { return false; }
#endif
    virtual bool isRenderFragmentContainer() const { return false; }
    virtual bool isReplica() const { return false; }

    virtual bool isRubyInline() const { return false; }
    virtual bool isRubyBlock() const { return false; }
    virtual bool isRubyBase() const { return false; }
    virtual bool isRubyRun() const { return false; }
    virtual bool isRubyText() const { return false; }

    virtual bool isSlider() const { return false; }
    virtual bool isTable() const { return false; }
    virtual bool isTableCell() const { return false; }
    virtual bool isRenderTableCol() const { return false; }
    virtual bool isTableCaption() const { return false; }
    virtual bool isTableSection() const { return false; }
    virtual bool isTextControl() const { return false; }
    virtual bool isTextArea() const { return false; }
    virtual bool isTextField() const { return false; }
    virtual bool isSearchField() const { return false; }
    virtual bool isTextControlInnerBlock() const { return false; }
    virtual bool isVideo() const { return false; }
    virtual bool isWidget() const { return false; }
    virtual bool isCanvas() const { return false; }
#if ENABLE(ATTACHMENT_ELEMENT)
    virtual bool isAttachment() const { return false; }
#endif
    virtual bool isRenderGrid() const { return false; }

    virtual bool isMultiColumnBlockFlow() const { return false; }
    virtual bool isRenderMultiColumnSet() const { return false; }
    virtual bool isRenderMultiColumnFlow() const { return false; }
    virtual bool isRenderMultiColumnSpannerPlaceholder() const { return false; }

    virtual bool isRenderScrollbarPart() const { return false; }
    virtual bool isRenderVTTCue() const { return false; }

    bool isDocumentElementRenderer() const { return document().documentElement() == m_node; }
    bool isBody() const { return node() && node()->hasTagName(HTMLNames::bodyTag); }
    bool isHR() const { return node() && node()->hasTagName(HTMLNames::hrTag); }
    bool isLegend() const;

    bool isHTMLMarquee() const;

    bool isTablePart() const { return isTableCell() || isRenderTableCol() || isTableCaption() || isTableRow() || isTableSection(); }

    inline bool isBeforeContent() const;
    inline bool isAfterContent() const;
    inline bool isBeforeOrAfterContent() const;
    static inline bool isBeforeContent(const RenderObject* obj) { return obj && obj->isBeforeContent(); }
    static inline bool isAfterContent(const RenderObject* obj) { return obj && obj->isAfterContent(); }
    static inline bool isBeforeOrAfterContent(const RenderObject* obj) { return obj && obj->isBeforeOrAfterContent(); }

    bool beingDestroyed() const { return m_bitfields.beingDestroyed(); }

    bool everHadLayout() const { return m_bitfields.everHadLayout(); }

    bool childrenInline() const { return m_bitfields.childrenInline(); }
    virtual void setChildrenInline(bool b) { m_bitfields.setChildrenInline(b); }
    
    enum FragmentedFlowState {
        NotInsideFragmentedFlow = 0,
        InsideInFragmentedFlow = 1,
    };

    void setFragmentedFlowStateIncludingDescendants(FragmentedFlowState, const RenderElement* fragmentedFlowRoot);

    FragmentedFlowState fragmentedFlowState() const { return m_bitfields.fragmentedFlowState(); }
    void setFragmentedFlowState(FragmentedFlowState state) { m_bitfields.setFragmentedFlowState(state); }

#if ENABLE(MATHML)
    virtual bool isRenderMathMLBlock() const { return false; }
    virtual bool isRenderMathMLTable() const { return false; }
    virtual bool isRenderMathMLOperator() const { return false; }
    virtual bool isRenderMathMLRow() const { return false; }
    virtual bool isRenderMathMLMath() const { return false; }
    virtual bool isRenderMathMLMenclose() const { return false; }
    virtual bool isRenderMathMLFenced() const { return false; }
    virtual bool isRenderMathMLFencedOperator() const { return false; }
    virtual bool isRenderMathMLFraction() const { return false; }
    virtual bool isRenderMathMLPadded() const { return false; }
    virtual bool isRenderMathMLRoot() const { return false; }
    virtual bool isRenderMathMLSpace() const { return false; }
    virtual bool isRenderMathMLSquareRoot() const { return false; }
    virtual bool isRenderMathMLScripts() const { return false; }
    virtual bool isRenderMathMLToken() const { return false; }
    virtual bool isRenderMathMLUnderOver() const { return false; }
#endif // ENABLE(MATHML)

    virtual bool isLegacyRenderSVGModelObject() const { return false; }
    virtual bool isRenderSVGModelObject() const { return false; }
    virtual bool isRenderSVGBlock() const { return false; };
    virtual bool isLegacySVGRoot() const { return false; }
    virtual bool isSVGRoot() const { return false; }
    virtual bool isSVGContainer() const { return false; }
    virtual bool isLegacySVGContainer() const { return false; }
    virtual bool isSVGTransformableContainer() const { return false; }
    virtual bool isLegacySVGTransformableContainer() const { return false; }
    virtual bool isSVGViewportContainer() const { return false; }
    virtual bool isLegacySVGViewportContainer() const { return false; }
    virtual bool isSVGGradientStop() const { return false; }
    virtual bool isLegacySVGHiddenContainer() const { return false; }
    virtual bool isSVGHiddenContainer() const { return false; }
    virtual bool isLegacySVGPath() const { return false; }
    virtual bool isSVGPath() const { return false; }
    virtual bool isSVGShape() const { return false; }
    virtual bool isLegacySVGShape() const { return false; }
    virtual bool isSVGText() const { return false; }
    virtual bool isSVGTextPath() const { return false; }
    virtual bool isSVGTSpan() const { return false; }
    virtual bool isSVGInline() const { return false; }
    virtual bool isSVGInlineText() const { return false; }
    virtual bool isLegacySVGImage() const { return false; }
    virtual bool isSVGImage() const { return false; }
    virtual bool isLegacySVGForeignObject() const { return false; }
    virtual bool isSVGForeignObject() const { return false; }
    virtual bool isSVGResourceContainer() const { return false; }
    virtual bool isSVGResourceFilter() const { return false; }
    virtual bool isSVGResourceClipper() const { return false; }
    virtual bool isSVGResourceFilterPrimitive() const { return false; }
    bool isSVGRootOrLegacySVGRoot() const { return isSVGRoot() || isLegacySVGRoot(); }
    bool isSVGShapeOrLegacySVGShape() const { return isSVGShape() || isLegacySVGShape(); }
    bool isSVGPathOrLegacySVGPath() const { return isSVGPath() || isLegacySVGPath(); }
    bool isSVGImageOrLegacySVGImage() const { return isSVGImage() || isLegacySVGImage(); }
    bool isSVGForeignObjectOrLegacySVGForeignObject() const { return isSVGForeignObject() || isLegacySVGForeignObject(); }
    bool isRenderOrLegacyRenderSVGModelObject() const { return isRenderSVGModelObject() || isLegacyRenderSVGModelObject(); }
    bool isSVGLayerAwareRenderer() const { return isSVGRoot() || isRenderSVGModelObject() || isSVGText() || isSVGInline() || isSVGForeignObject(); }

    // 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();
    virtual bool needsBoundariesUpdate() { return false; }

    // 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;

#if ENABLE(LAYER_BASED_SVG_ENGINE)
    // The objectBoundingBox of a SVG container is affected by the transformations applied on its children -- the container
    // bounding box is a union of all child bounding boxes, mapped through their transformation matrices.
    //
    // This method ignores all transformations and computes the objectBoundingBox, without mapping through the child
    // transformation matrices. The SVG render tree is constructed in such a way, that it can be mapped to CSS equivalents:
    // The SVG render tree underneath the outermost <svg> behaves as a set of absolutely positioned, possibly nested, boxes.
    // They are laid out in such a way that transformations do NOT affect layout, as in HTML/CSS world, but take affect during
    // painting, hit-testing etc. This allows to minimize the amount of re-layouts when animating transformations in SVG
    // (not using CSS Animations/Transitions / Web Animations, but e.g. SMIL <animateTransform>, JS, ...).
    virtual FloatRect objectBoundingBoxWithoutTransformations() const { return objectBoundingBox(); }
#endif

    // Returns the smallest rectangle enclosing all of the painted content
    // respecting clipping, masking, filters, opacity, stroke-width and markers
    virtual FloatRect repaintRectInLocalCoordinates() 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 repaint 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);

    virtual bool hasIntrinsicAspectRatio() const { return isReplacedOrInlineBlock() && (isImage() || isVideo() || isCanvas()); }
    bool isAnonymous() const { return m_bitfields.isAnonymous(); }
    bool isAnonymousBlock() const;
    bool isBlockContainer() const;

    bool isFloating() const { return m_bitfields.floating(); }

    bool isPositioned() const { return m_bitfields.isPositioned(); }
    bool isInFlowPositioned() const { return m_bitfields.isRelativelyPositioned() || m_bitfields.isStickilyPositioned(); }
    bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
    bool isFixedPositioned() const { return isOutOfFlowPositioned() && style().position() == PositionType::Fixed; }
    bool isAbsolutelyPositioned() const { return isOutOfFlowPositioned() && style().position() == PositionType::Absolute; }
    bool isRelativelyPositioned() const { return m_bitfields.isRelativelyPositioned(); }
    bool isStickilyPositioned() const { return m_bitfields.isStickilyPositioned(); }
    bool shouldUsePositionedClipping() const { return isAbsolutelyPositioned() || isSVGForeignObject(); }

    bool isText() const  { return !m_bitfields.isBox() && m_bitfields.isTextOrRenderView(); }
    bool isLineBreak() const { return m_bitfields.isLineBreak(); }
    bool isBR() const { return isLineBreak() && !isWBR(); }
    bool isLineBreakOpportunity() const { return isLineBreak() && isWBR(); }
    bool isTextOrLineBreak() const { return isText() || isLineBreak(); }
    bool isBox() const { return m_bitfields.isBox(); }
    bool isTableRow() const { return m_bitfields.isTableRow(); }
    bool isRenderView() const  { return m_bitfields.isBox() && m_bitfields.isTextOrRenderView(); }
    bool isInline() const { return m_bitfields.isInline(); } // inline object
    bool isReplacedOrInlineBlock() const { return m_bitfields.isReplacedOrInlineBlock(); }
    bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); }

    bool hasReflection() const { return m_bitfields.hasRareData() && rareData().hasReflection(); }
    bool isRenderFragmentedFlow() const { return m_bitfields.hasRareData() && rareData().isRenderFragmentedFlow(); }
    bool hasOutlineAutoAncestor() const { return m_bitfields.hasRareData() && rareData().hasOutlineAutoAncestor(); }
    bool paintContainmentApplies() const { return m_bitfields.hasRareData() && rareData().paintContainmentApplies(); }

#if ENABLE(LAYER_BASED_SVG_ENGINE)
    bool hasSVGTransform() const { return m_bitfields.hasRareData() && rareData().hasSVGTransform(); }
#else
    bool hasSVGTransform() const { return false; }
#endif

    bool isExcludedFromNormalLayout() const { return m_bitfields.isExcludedFromNormalLayout(); }
    void setIsExcludedFromNormalLayout(bool excluded) { m_bitfields.setIsExcludedFromNormalLayout(excluded); }
    bool isExcludedAndPlacedInBorder() const { return isExcludedFromNormalLayout() && isLegend(); }

    bool hasLayer() const { return m_bitfields.hasLayer(); }

    enum BoxDecorationState {
        NoBoxDecorations,
        HasBoxDecorationsAndBackgroundObscurationStatusInvalid,
        HasBoxDecorationsAndBackgroundIsKnownToBeObscured,
        HasBoxDecorationsAndBackgroundMayBeVisible,
    };
    bool hasVisibleBoxDecorations() const { return m_bitfields.boxDecorationState() != NoBoxDecorations; }
    bool backgroundIsKnownToBeObscured(const LayoutPoint& paintOffset);

    bool needsLayout() const;
    bool selfNeedsLayout() const { return m_bitfields.needsLayout(); }
    bool needsPositionedMovementLayout() const { return m_bitfields.needsPositionedMovementLayout(); }
    bool needsPositionedMovementLayoutOnly() const;

    bool posChildNeedsLayout() const { return m_bitfields.posChildNeedsLayout(); }
    bool needsSimplifiedNormalFlowLayout() const { return m_bitfields.needsSimplifiedNormalFlowLayout(); }
    bool needsSimplifiedNormalFlowLayoutOnly() const;
    bool normalChildNeedsLayout() const { return m_bitfields.normalChildNeedsLayout(); }
    
    bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }

    bool isSelectionBorder() const;

    bool hasNonVisibleOverflow() const { return m_bitfields.hasNonVisibleOverflow(); }

    bool hasPotentiallyScrollableOverflow() const;

    bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); } // Transform, perspective or transform-style: preserve-3d.
    bool hasTransform() const { return hasTransformRelatedProperty() && (style().hasTransform() || style().translate() || style().scale() || style().rotate() || hasSVGTransform()); }
    bool hasTransformOrPerspective() const { return hasTransformRelatedProperty() && (hasTransform() || style().hasPerspective()); }

    inline bool preservesNewline() const;

    RenderView& view() const { return *document().renderView(); };
    HostWindow* hostWindow() const;

    // Returns true if this renderer is rooted.
    bool isRooted() const;

    Node* node() const
    { 
        if (isAnonymous())
            return nullptr;
        ASSERT(m_node);
        return m_node.get(); 
    }

    Node* nonPseudoNode() const { return isPseudoElement() ? nullptr : node(); }

    // Returns the styled node that caused the generation of this renderer.
    // This is the same as node() except for renderers of :before and :after
    // pseudo elements for which their parent node is returned.
    Node* generatingNode() const { return isPseudoElement() ? generatingPseudoHostElement() : node(); }

    Document& document() const { ASSERT(m_node); return m_node->document(); }
    Frame& frame() const;
    Page& page() const;
    Settings& settings() const { return page().settings(); }

    // Returns the object containing this one. Can be different from parent for positioned elements.
    // If repaintContainer and repaintContainerSkipped are not null, on return *repaintContainerSkipped
    // is true if the renderer returned is an ancestor of repaintContainer.
    RenderElement* container() const;
    RenderElement* container(const RenderLayerModelObject* repaintContainer, bool& repaintContainerSkipped) const;

    RenderBoxModelObject* offsetParent() const;

    void markContainingBlocksForLayout(ScheduleRelayout = ScheduleRelayout::Yes, RenderElement* newRoot = nullptr);
    void setNeedsLayout(MarkingBehavior = MarkContainingBlockChain);
    void clearNeedsLayout();
    void setPreferredLogicalWidthsDirty(bool, MarkingBehavior = MarkContainingBlockChain);
    void invalidateContainerPreferredLogicalWidths();
    
    void setNeedsLayoutAndPrefWidthsRecalc();

    void setPositionState(PositionType);
    void clearPositionedState() { m_bitfields.clearPositionedState(); }

    void setFloating(bool b = true) { m_bitfields.setFloating(b); }
    void setInline(bool b = true) { m_bitfields.setIsInline(b); }

    void setHasVisibleBoxDecorations(bool = true);
    void invalidateBackgroundObscurationStatus();
    virtual bool computeBackgroundIsKnownToBeObscured(const LayoutPoint&) { return false; }

    void setIsText() { ASSERT(!isBox()); m_bitfields.setIsTextOrRenderView(true); }
    void setIsLineBreak() { m_bitfields.setIsLineBreak(true); }
    void setIsBox() { m_bitfields.setIsBox(true); }
    void setIsTableRow() { m_bitfields.setIsTableRow(true); }
    void setIsRenderView() { ASSERT(isBox()); m_bitfields.setIsTextOrRenderView(true); }
    void setReplacedOrInlineBlock(bool b = true) { m_bitfields.setIsReplacedOrInlineBlock(b); }
    void setHorizontalWritingMode(bool b = true) { m_bitfields.setHorizontalWritingMode(b); }
    void setHasNonVisibleOverflow(bool b = true) { m_bitfields.setHasNonVisibleOverflow(b); }
    void setHasLayer(bool b = true) { m_bitfields.setHasLayer(b); }
    void setHasTransformRelatedProperty(bool b = true) { m_bitfields.setHasTransformRelatedProperty(b); }

    void setHasReflection(bool = true);
    void setIsRenderFragmentedFlow(bool = true);
    void setHasOutlineAutoAncestor(bool = true);
    void setPaintContainmentApplies(bool = true);
#if ENABLE(LAYER_BASED_SVG_ENGINE)
    void setHasSVGTransform(bool = true);
#endif

    // Hook so that RenderTextControl can return the line height of its inner renderer.
    // For other renderers, the value is the same as lineHeight(false).
    virtual int innerLineHeight() const;

    // used for element state updates that cannot be fixed with a
    // repaint and do not need a relayout
    virtual void updateFromElement() { }

    bool isComposited() const;

    bool hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter = HitTestAll);
    virtual Node* nodeForHitTest() const;
    virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&);

    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);

    virtual Position positionForPoint(const LayoutPoint&);
    virtual VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*);
    VisiblePosition createVisiblePosition(int offset, Affinity) const;
    VisiblePosition createVisiblePosition(const Position&) const;

    // Returns the containing block level element for this element.
    WEBCORE_EXPORT RenderBlock* containingBlock() const;
    static RenderBlock* containingBlockForPositionType(PositionType, const RenderObject&);

    // Convert the given local point to absolute coordinates. If OptionSet<MapCoordinatesMode> includes UseTransforms, take transforms into account.
    WEBCORE_EXPORT FloatPoint localToAbsolute(const FloatPoint& localPoint = FloatPoint(), OptionSet<MapCoordinatesMode> = { }, bool* wasFixed = nullptr) const;
    FloatPoint absoluteToLocal(const FloatPoint&, OptionSet<MapCoordinatesMode> = { }) const;

    // Convert a local quad to absolute coordinates, taking transforms into account.
    FloatQuad localToAbsoluteQuad(const FloatQuad&, OptionSet<MapCoordinatesMode> = UseTransforms, bool* wasFixed = nullptr) const;
    // Convert an absolute quad to local coordinates.
    FloatQuad absoluteToLocalQuad(const FloatQuad&, OptionSet<MapCoordinatesMode> = UseTransforms) const;

    // Convert a local quad into the coordinate system of container, taking transforms into account.
    WEBCORE_EXPORT FloatQuad localToContainerQuad(const FloatQuad&, const RenderLayerModelObject* container, OptionSet<MapCoordinatesMode> = UseTransforms, bool* wasFixed = nullptr) const;
    WEBCORE_EXPORT FloatPoint localToContainerPoint(const FloatPoint&, const RenderLayerModelObject* container, OptionSet<MapCoordinatesMode> = UseTransforms, bool* wasFixed = nullptr) const;

    // 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(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const;
    // Return the offset from an object up the container() chain. Asserts that none of the intermediate objects have transforms.
    LayoutSize offsetFromAncestorContainer(const RenderElement&) const;

#if PLATFORM(IOS_FAMILY)
    virtual void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max());
    virtual void absoluteQuadsForSelection(Vector<FloatQuad>& quads) const { absoluteQuads(quads); }
    WEBCORE_EXPORT static Vector<SelectionGeometry> collectSelectionGeometries(const SimpleRange&);
    WEBCORE_EXPORT static Vector<SelectionGeometry> collectSelectionGeometriesWithoutUnionInteriorLines(const SimpleRange&);
#endif

    virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const { }

    WEBCORE_EXPORT IntRect absoluteBoundingBoxRect(bool useTransform = true, bool* wasFixed = nullptr) const;
    IntRect absoluteBoundingBoxRectIgnoringTransforms() const { return absoluteBoundingBoxRect(false); }

    // Build an array of quads in absolute coords for line boxes
    virtual void absoluteQuads(Vector<FloatQuad>&, bool* /*wasFixed*/ = nullptr) const { }
    virtual void absoluteFocusRingQuads(Vector<FloatQuad>&);

    enum class BoundingRectBehavior : uint8_t {
        RespectClipping = 1 << 0,
        UseVisibleBounds = 1 << 1,
        IgnoreTinyRects = 1 << 2,
        IgnoreEmptyTextSelections = 1 << 3,
        UseSelectionHeight = 1 << 4,
    };
    WEBCORE_EXPORT static Vector<FloatQuad> absoluteTextQuads(const SimpleRange&, OptionSet<BoundingRectBehavior> = { });
    WEBCORE_EXPORT static Vector<IntRect> absoluteTextRects(const SimpleRange&, OptionSet<BoundingRectBehavior> = { });
    WEBCORE_EXPORT static Vector<FloatRect> absoluteBorderAndTextRects(const SimpleRange&, OptionSet<BoundingRectBehavior> = { });
    static Vector<FloatRect> clientBorderAndTextRects(const SimpleRange&);

    // the rect that will be painted if this object is passed as the paintingRoot
    WEBCORE_EXPORT LayoutRect paintingRootRect(LayoutRect& topLevelRect);

    virtual LayoutUnit minPreferredLogicalWidth() const { return 0; }
    virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }

    const RenderStyle& style() const;
    const RenderStyle& firstLineStyle() const;

    // Anonymous blocks that are part of of a continuation chain will return their inline continuation's outline style instead.
    // This is typically only relevant when repainting.
    virtual const RenderStyle& outlineStyleForRepaint() const { return style(); }
    
    virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;

    // Return the RenderLayerModelObject in the container chain which is responsible for painting this object, or nullptr
    // if painting is root-relative. This is the container that should be passed to the 'forRepaint' functions.
    struct RepaintContainerStatus {
        bool fullRepaintIsScheduled { false }; // Either the repaint container or a layer in-between has aleady been scheduled for full repaint.
        const RenderLayerModelObject* renderer { nullptr };
    };
    RepaintContainerStatus containerForRepaint() const;
    // Actually do the repaint of rect r for this object which has been computed in the coordinate space
    // of repaintContainer. If repaintContainer is nullptr, repaint via the view.
    void repaintUsingContainer(const RenderLayerModelObject* repaintContainer, const LayoutRect&, bool shouldClipToLayer = true) const;
    
    // Repaint the entire object.  Called when, e.g., the color of a border changes, or when a border
    // style changes.
    void repaint() const;

    // Repaint a specific subrectangle within a given object.  The rect |r| is in the object's coordinate space.
    WEBCORE_EXPORT void repaintRectangle(const LayoutRect&, bool shouldClipToLayer = true) const;

    // Repaint a slow repaint object, which, at this time, means we are repainting an object with background-attachment:fixed.
    void repaintSlowRepaintObject() const;

    enum class VisibleRectContextOption {
        UseEdgeInclusiveIntersection = 1 << 0,
        ApplyCompositedClips = 1 << 1,
        ApplyCompositedContainerScrolls  = 1 << 2,
        ApplyContainerClip = 1 << 3,
    };
    struct VisibleRectContext {
        VisibleRectContext(bool hasPositionFixedDescendant = false, bool dirtyRectIsFlipped = false, OptionSet<VisibleRectContextOption> options = { })
            : hasPositionFixedDescendant(hasPositionFixedDescendant)
            , dirtyRectIsFlipped(dirtyRectIsFlipped)
            , options(options)
            {
            }
        bool hasPositionFixedDescendant { false };
        bool dirtyRectIsFlipped { false };
        bool descendantNeedsEnclosingIntRect { false };
        OptionSet<VisibleRectContextOption> options;
    };

    // Returns the rect that should be repainted whenever this object changes. The rect is in the view's
    // coordinate space. This method deals with outlines and overflow.
    LayoutRect absoluteClippedOverflowRectForRepaint() const { return clippedOverflowRect(nullptr, visibleRectContextForRepaint()); }
    LayoutRect absoluteClippedOverflowRectForSpatialNavigation() const { return clippedOverflowRect(nullptr, visibleRectContextForSpatialNavigation()); }
    WEBCORE_EXPORT IntRect pixelSnappedAbsoluteClippedOverflowRect() const;
    virtual LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;
    LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const { return clippedOverflowRect(repaintContainer, visibleRectContextForRepaint()); }
    virtual LayoutRect rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const;
    virtual LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap* = nullptr) const { return LayoutRect(); }

    // Given a rect in the object's coordinate space, compute a rect suitable for repainting
    // that rect in view coordinates.
    LayoutRect computeAbsoluteRepaintRect(const LayoutRect& rect) const { return computeRect(rect, nullptr, visibleRectContextForRepaint()); }
    // Given a rect in the object's coordinate space, compute a rect  in the coordinate space
    // of repaintContainer suitable for the given VisibleRectContext.
    LayoutRect computeRect(const LayoutRect&, const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;
    LayoutRect computeRectForRepaint(const LayoutRect& rect, const RenderLayerModelObject* repaintContainer) const { return computeRect(rect, repaintContainer, visibleRectContextForRepaint()); }
    FloatRect computeFloatRectForRepaint(const FloatRect&, const RenderLayerModelObject* repaintContainer) const;

    // Given a rect in the object's coordinate space, compute the location in container space where this rect is visible,
    // when clipping and scrolling as specified by the context. When using edge-inclusive intersection, return std::nullopt
    // rather than an empty rect if the rect is completely clipped out in container space.
    virtual std::optional<LayoutRect> computeVisibleRectInContainer(const LayoutRect&, const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;
    virtual std::optional<FloatRect> computeFloatVisibleRectInContainer(const FloatRect&, const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;

    WEBCORE_EXPORT bool hasNonEmptyVisibleRectRespectingParentFrames() const;

    virtual unsigned length() const { return 1; }

    bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
    bool isInFlow() const { return !isFloatingOrOutOfFlowPositioned(); }

    enum HighlightState {
        None, // The object is not selected.
        Start, // The object either contains the start of a selection run or is the start of a run
        Inside, // The object is fully encompassed by a selection run
        End, // The object either contains the end of a selection run or is the end of a run
        Both // 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 HighlightState enum declaration).
    HighlightState selectionState() const { return m_bitfields.selectionState(); }
    virtual void setSelectionState(HighlightState);
    inline void setSelectionStateIfNeeded(HighlightState);
    bool canUpdateSelectionOnRootLineBoxes();

    // 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 selectionRectForRepaint(const RenderLayerModelObject* /*repaintContainer*/, bool /*clipToVisibleContent*/ = true) { return LayoutRect(); }

    virtual bool canBeSelectionLeaf() const { return false; }

    // Whether or not a given block needs to paint selection gaps.
    virtual bool shouldPaintSelectionGaps() const { return false; }

    // When performing a global document tear-down, or when going into the back/forward cache, the renderer of the document is cleared.
    bool renderTreeBeingDestroyed() const;

    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;

    void imageChanged(CachedImage*, const IntRect* = nullptr) override;
    virtual void imageChanged(WrappedImagePtr, const IntRect* = nullptr) { }

    // 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 RenderLayerModelObject* repaintContainer, TransformState&, OptionSet<MapCoordinatesMode>, bool* wasFixed = nullptr) const;
    virtual void mapAbsoluteToLocalPoint(OptionSet<MapCoordinatesMode>, 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 RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const;
    
    bool shouldUseTransformFromContainer(const RenderObject* container) const;
    void getTransformFromContainer(const RenderObject* container, const LayoutSize& offsetInContainer, TransformationMatrix&) const;
    
    void pushOntoTransformState(TransformState&, OptionSet<MapCoordinatesMode>, const RenderLayerModelObject* repaintContainer, const RenderElement* container, const LayoutSize& offsetInContainer, bool containerSkipped) const;
    void pushOntoGeometryMap(RenderGeometryMap&, const RenderLayerModelObject* repaintContainer, RenderElement* container, bool containerSkipped) const;

    bool participatesInPreserve3D(const RenderElement* container) const;

    virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& /* additionalOffset */, const RenderLayerModelObject* /* paintContainer */ = nullptr) const { };

    LayoutRect absoluteOutlineBounds() const { return outlineBoundsForRepaint(nullptr); }

    // FIXME: Renderers should not need to be notified about internal reparenting (webkit.org/b/224143).
    enum class IsInternalMove { No, Yes };
    virtual void insertedIntoTree(IsInternalMove = IsInternalMove::No);
    virtual void willBeRemovedFromTree(IsInternalMove = IsInternalMove::No);

    void resetFragmentedFlowStateOnRemoval();
    void initializeFragmentedFlowStateOnInsertion();

    virtual String description() const;
    virtual String debugDescription() const;

    void addPDFURLRect(const PaintInfo&, const LayoutPoint&) const;

    bool isSkippedContent() const;

    bool shouldSkipContent() const;

protected:
    //////////////////////////////////////////
    // Helper functions. Dangerous to use!
    void setPreviousSibling(RenderObject* previous) { m_previous = previous; }
    void setNextSibling(RenderObject* next) { m_next = next; }
    void setParent(RenderElement*);
    //////////////////////////////////////////
    Node& nodeForNonAnonymous() const { ASSERT(!isAnonymous()); ASSERT(m_node); return *m_node; }

    void adjustRectForOutlineAndShadow(LayoutRect&) const;

    virtual void willBeDestroyed();

    void setNeedsPositionedMovementLayoutBit(bool b) { m_bitfields.setNeedsPositionedMovementLayout(b); }
    void setNormalChildNeedsLayoutBit(bool b) { m_bitfields.setNormalChildNeedsLayout(b); }
    void setPosChildNeedsLayoutBit(bool b) { m_bitfields.setPosChildNeedsLayout(b); }
    void setNeedsSimplifiedNormalFlowLayoutBit(bool b) { m_bitfields.setNeedsSimplifiedNormalFlowLayout(b); }

    virtual RenderFragmentedFlow* locateEnclosingFragmentedFlow() const;

    static FragmentedFlowState computedFragmentedFlowState(const RenderObject&);

    static VisibleRectContext visibleRectContextForRepaint();
    static VisibleRectContext visibleRectContextForSpatialNavigation();

    bool isSetNeedsLayoutForbidden() const;

    enum class ClipRepaintToLayer : uint8_t { No, Yes };
    enum class ForceRepaint : uint8_t { No, Yes };
    void issueRepaint(std::optional<LayoutRect> partialRepaintRect = std::nullopt, ClipRepaintToLayer = ClipRepaintToLayer::No, ForceRepaint = ForceRepaint::No) const;

private:
    void addAbsoluteRectForLayer(LayoutRect& result);
    void setLayerNeedsFullRepaint();
    void setLayerNeedsFullRepaintForPositionedMovementLayout();

#if PLATFORM(IOS_FAMILY)
    struct SelectionGeometries {
        Vector<SelectionGeometry> geometries;
        int maxLineNumber;
    };
    WEBCORE_EXPORT static SelectionGeometries collectSelectionGeometriesInternal(const SimpleRange&);
#endif

    Node* generatingPseudoHostElement() const;

    void propagateRepaintToParentWithOutlineAutoIfNeeded(const RenderLayerModelObject& repaintContainer, const LayoutRect& repaintRect) const;

    virtual bool isWBR() const { ASSERT_NOT_REACHED(); return false; }

    void setEverHadLayout(bool b) { m_bitfields.setEverHadLayout(b); }

    bool hasRareData() const { return m_bitfields.hasRareData(); }
    void setHasRareData(bool b) { m_bitfields.setHasRareData(b); }

#if ASSERT_ENABLED
    void setNeedsLayoutIsForbidden(bool flag) const { m_setNeedsLayoutForbidden = flag; }
    void checkBlockPositionedObjectsNeedLayout();
#endif

    WeakPtr<Node, WeakPtrImplWithEventTargetData> m_node;

    RenderElement* m_parent;
    RenderObject* m_previous;
    RenderObject* m_next;

    CheckedPtr<Layout::Box> m_layoutBox;

#if ASSERT_ENABLED
    bool m_hasAXObject : 1;
    mutable bool 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; }\

#define ADD_ENUM_BITFIELD(name, Name, Type, width) \
    private:\
        unsigned m_##name : width;\
    public:\
        Type name() const { return static_cast<Type>(m_##name); }\
        void set##Name(Type name) { m_##name = static_cast<unsigned>(name); }\

    class RenderObjectBitfields {
        enum PositionedState {
            IsStaticallyPositioned = 0,
            IsRelativelyPositioned = 1,
            IsOutOfFlowPositioned = 2,
            IsStickilyPositioned = 3
        };

    public:
        RenderObjectBitfields(const Node& node)
            : m_hasRareData(false)
            , m_beingDestroyed(false)
            , m_needsLayout(false)
            , m_needsPositionedMovementLayout(false)
            , m_normalChildNeedsLayout(false)
            , m_posChildNeedsLayout(false)
            , m_needsSimplifiedNormalFlowLayout(false)
            , m_preferredLogicalWidthsDirty(false)
            , m_floating(false)
            , m_isAnonymous(node.isDocumentNode())
            , m_isTextOrRenderView(false)
            , m_isBox(false)
            , m_isTableRow(false)
            , m_isInline(true)
            , m_isReplacedOrInlineBlock(false)
            , m_isLineBreak(false)
            , m_horizontalWritingMode(true)
            , m_hasLayer(false)
            , m_hasNonVisibleOverflow(false)
            , m_hasTransformRelatedProperty(false)
            , m_everHadLayout(false)
            , m_childrenInline(false)
            , m_isExcludedFromNormalLayout(false)
            , m_positionedState(IsStaticallyPositioned)
            , m_selectionState(HighlightState::None)
            , m_fragmentedFlowState(NotInsideFragmentedFlow)
            , m_boxDecorationState(NoBoxDecorations)
        {
        }

        ADD_BOOLEAN_BITFIELD(hasRareData, HasRareData);
        
        ADD_BOOLEAN_BITFIELD(beingDestroyed, BeingDestroyed);
        ADD_BOOLEAN_BITFIELD(needsLayout, NeedsLayout);
        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(isAnonymous, IsAnonymous);
        ADD_BOOLEAN_BITFIELD(isTextOrRenderView, IsTextOrRenderView);
        ADD_BOOLEAN_BITFIELD(isBox, IsBox);
        ADD_BOOLEAN_BITFIELD(isTableRow, IsTableRow);
        ADD_BOOLEAN_BITFIELD(isInline, IsInline);
        ADD_BOOLEAN_BITFIELD(isReplacedOrInlineBlock, IsReplacedOrInlineBlock);
        ADD_BOOLEAN_BITFIELD(isLineBreak, IsLineBreak);
        ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode);

        ADD_BOOLEAN_BITFIELD(hasLayer, HasLayer);
        ADD_BOOLEAN_BITFIELD(hasNonVisibleOverflow, HasNonVisibleOverflow); // Set in the case of overflow:auto/scroll/hidden
        ADD_BOOLEAN_BITFIELD(hasTransformRelatedProperty, HasTransformRelatedProperty);

        ADD_BOOLEAN_BITFIELD(everHadLayout, EverHadLayout);

        // from RenderBlock
        ADD_BOOLEAN_BITFIELD(childrenInline, ChildrenInline);
        
        ADD_BOOLEAN_BITFIELD(isExcludedFromNormalLayout, IsExcludedFromNormalLayout);

    private:
        unsigned m_positionedState : 2; // PositionedState
        unsigned m_selectionState : 3; // SelectionState
        unsigned m_fragmentedFlowState : 2; // FragmentedFlowState
        unsigned m_boxDecorationState : 2; // BoxDecorationState

    public:
        bool isOutOfFlowPositioned() const { return m_positionedState == IsOutOfFlowPositioned; }
        bool isRelativelyPositioned() const { return m_positionedState == IsRelativelyPositioned; }
        bool isStickilyPositioned() const { return m_positionedState == IsStickilyPositioned; }
        bool isPositioned() const { return m_positionedState != IsStaticallyPositioned; }

        void setPositionedState(int positionState)
        {
            // This mask maps PositionType::Fixed and PositionType::Absolute to IsOutOfFlowPositioned, saving one bit.
            m_positionedState = static_cast<PositionedState>(positionState & 0x3);
        }
        void clearPositionedState() { m_positionedState = static_cast<unsigned>(PositionType::Static); }

        ALWAYS_INLINE HighlightState selectionState() const { return static_cast<HighlightState>(m_selectionState); }
        ALWAYS_INLINE void setSelectionState(HighlightState selectionState) { m_selectionState = selectionState; }
        
        ALWAYS_INLINE FragmentedFlowState fragmentedFlowState() const { return static_cast<FragmentedFlowState>(m_fragmentedFlowState); }
        ALWAYS_INLINE void setFragmentedFlowState(FragmentedFlowState fragmentedFlowState) { m_fragmentedFlowState = fragmentedFlowState; }

        ALWAYS_INLINE BoxDecorationState boxDecorationState() const { return static_cast<BoxDecorationState>(m_boxDecorationState); }
        ALWAYS_INLINE void setBoxDecorationState(BoxDecorationState boxDecorationState) { m_boxDecorationState = boxDecorationState; }
    };

    RenderObjectBitfields m_bitfields;

    // FIXME: This should be RenderElementRareData.
    class RenderObjectRareData {
        WTF_MAKE_FAST_ALLOCATED;
    public:
        RenderObjectRareData();
        ~RenderObjectRareData();

        ADD_BOOLEAN_BITFIELD(hasReflection, HasReflection);
        ADD_BOOLEAN_BITFIELD(isRenderFragmentedFlow, IsRenderFragmentedFlow);
        ADD_BOOLEAN_BITFIELD(hasOutlineAutoAncestor, HasOutlineAutoAncestor);
        ADD_BOOLEAN_BITFIELD(paintContainmentApplies, PaintContainmentApplies);
#if ENABLE(LAYER_BASED_SVG_ENGINE)
        ADD_BOOLEAN_BITFIELD(hasSVGTransform, HasSVGTransform);
#endif

        // From RenderElement
        std::unique_ptr<ReferencedSVGResources> referencedSVGResources;
        WeakPtr<RenderBlockFlow> backdropRenderer;

        // From RenderBox
        RefPtr<ControlPart> controlPart;
    };
    
    WEBCORE_EXPORT const RenderObject::RenderObjectRareData& rareData() const;
    RenderObjectRareData& ensureRareData();
    void removeRareData();
    
    typedef HashMap<const RenderObject*, std::unique_ptr<RenderObjectRareData>> RareDataMap;

    static RareDataMap& rareDataMap();

#undef ADD_BOOLEAN_BITFIELD
};

class RenderObject::SetLayoutNeededForbiddenScope {
public:
    explicit SetLayoutNeededForbiddenScope(const RenderObject&, bool isForbidden = true);
#if ASSERT_ENABLED
    ~SetLayoutNeededForbiddenScope();
private:
    const RenderObject& m_renderObject;
    bool m_preexistingForbidden;
#endif
};

inline Frame& RenderObject::frame() const
{
    return *document().frame();
}

inline Page& RenderObject::page() const
{
    // The render tree will always be torn down before Frame is disconnected from Page,
    // so it's safe to assume Frame::page() is non-null as long as there are live RenderObjects.
    ASSERT(frame().page());
    return *frame().page();
}

inline bool RenderObject::renderTreeBeingDestroyed() const
{
    return document().renderTreeBeingDestroyed();
}

inline bool RenderObject::isBeforeContent() const
{
    // Text nodes don't have their own styles, so ignore the style on a text node.
    if (isText())
        return false;
    if (style().styleType() != PseudoId::Before)
        return false;
    return true;
}

inline bool RenderObject::isAfterContent() const
{
    // Text nodes don't have their own styles, so ignore the style on a text node.
    if (isText())
        return false;
    if (style().styleType() != PseudoId::After)
        return false;
    return true;
}

inline bool RenderObject::isBeforeOrAfterContent() const
{
    return isBeforeContent() || isAfterContent();
}

inline void RenderObject::setNeedsLayout(MarkingBehavior markParents)
{
    ASSERT(!isSetNeedsLayoutForbidden());
    if (m_bitfields.needsLayout())
        return;
    m_bitfields.setNeedsLayout(true);
    if (markParents == MarkContainingBlockChain)
        markContainingBlocksForLayout();
    if (hasLayer())
        setLayerNeedsFullRepaint();
}

inline bool RenderObject::preservesNewline() const
{
    if (isSVGInlineText())
        return false;
        
    return style().preserveNewline();
}

inline void RenderObject::setSelectionStateIfNeeded(HighlightState state)
{
    if (selectionState() == state)
        return;

    setSelectionState(state);
}

inline void RenderObject::setHasVisibleBoxDecorations(bool b)
{
    if (!b) {
        m_bitfields.setBoxDecorationState(NoBoxDecorations);
        return;
    }
    if (hasVisibleBoxDecorations())
        return;
    m_bitfields.setBoxDecorationState(HasBoxDecorationsAndBackgroundObscurationStatusInvalid);
}

inline void RenderObject::invalidateBackgroundObscurationStatus()
{
    if (!hasVisibleBoxDecorations())
        return;
    m_bitfields.setBoxDecorationState(HasBoxDecorationsAndBackgroundObscurationStatusInvalid);
}

inline bool RenderObject::backgroundIsKnownToBeObscured(const LayoutPoint& paintOffset)
{
    if (m_bitfields.boxDecorationState() == HasBoxDecorationsAndBackgroundObscurationStatusInvalid) {
        BoxDecorationState boxDecorationState = computeBackgroundIsKnownToBeObscured(paintOffset) ? HasBoxDecorationsAndBackgroundIsKnownToBeObscured : HasBoxDecorationsAndBackgroundMayBeVisible;
        m_bitfields.setBoxDecorationState(boxDecorationState);
    }
    return m_bitfields.boxDecorationState() == HasBoxDecorationsAndBackgroundIsKnownToBeObscured;
}

inline bool RenderObject::needsSimplifiedNormalFlowLayoutOnly() const
{
    return m_bitfields.needsSimplifiedNormalFlowLayout() && !m_bitfields.needsLayout() && !m_bitfields.normalChildNeedsLayout()
        && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsPositionedMovementLayout();
}

inline RenderFragmentedFlow* RenderObject::enclosingFragmentedFlow() const
{
    if (fragmentedFlowState() == NotInsideFragmentedFlow)
        return nullptr;

    return locateEnclosingFragmentedFlow();
}

inline bool RenderObject::isAnonymousBlock() const
{
    // This function must be kept in sync with anonymous block creation conditions in RenderBlock::createAnonymousBlock().
    // FIXME: That seems difficult. Can we come up with a simpler way to make behavior correct?
    // FIXME: Does this relatively long function benefit from being inlined?
    return isAnonymous()
        && (style().display() == DisplayType::Block || style().display() == DisplayType::Box)
        && style().styleType() == PseudoId::None
        && isRenderBlock()
#if ENABLE(MATHML)
        && !isRenderMathMLBlock()
#endif
        && !isListMarker()
        && !isRenderFragmentedFlow()
        && !isRenderMultiColumnSet()
        && !isRenderView();
}

inline bool RenderObject::needsLayout() const
{
    return m_bitfields.needsLayout()
        || m_bitfields.normalChildNeedsLayout()
        || m_bitfields.posChildNeedsLayout()
        || m_bitfields.needsSimplifiedNormalFlowLayout()
        || m_bitfields.needsPositionedMovementLayout();
}

inline bool RenderObject::needsPositionedMovementLayoutOnly() const
{
    return m_bitfields.needsPositionedMovementLayout()
        && !m_bitfields.needsLayout()
        && !m_bitfields.normalChildNeedsLayout()
        && !m_bitfields.posChildNeedsLayout()
        && !m_bitfields.needsSimplifiedNormalFlowLayout();
}

inline void RenderObject::setNeedsLayoutAndPrefWidthsRecalc()
{
    setNeedsLayout();
    setPreferredLogicalWidthsDirty(true);
}

inline void RenderObject::setPositionState(PositionType position)
{
    ASSERT((position != PositionType::Absolute && position != PositionType::Fixed) || isBox());
    m_bitfields.setPositionedState(static_cast<int>(position));
}

inline FloatQuad RenderObject::localToAbsoluteQuad(const FloatQuad& quad, OptionSet<MapCoordinatesMode> mode, bool* wasFixed) const
{
    return localToContainerQuad(quad, nullptr, mode, wasFixed);
}

inline auto RenderObject::visibleRectContextForRepaint() -> VisibleRectContext
{
    return { false, false, { VisibleRectContextOption::ApplyContainerClip, VisibleRectContextOption::ApplyCompositedContainerScrolls } };
}

inline auto RenderObject::visibleRectContextForSpatialNavigation() -> VisibleRectContext
{
    return { false, false, { VisibleRectContextOption::ApplyContainerClip, VisibleRectContextOption::ApplyCompositedContainerScrolls, VisibleRectContextOption::ApplyCompositedClips } };
}

inline bool RenderObject::isSetNeedsLayoutForbidden() const
{
#if ASSERT_ENABLED
    return m_setNeedsLayoutForbidden;
#else
    return false;
#endif
}

#if !ASSERT_ENABLED

inline RenderObject::SetLayoutNeededForbiddenScope::SetLayoutNeededForbiddenScope(const RenderObject&, bool)
{
}

#endif

inline void Node::setRenderer(RenderObject* renderer)
{
    m_rendererWithStyleFlags.setPointer(renderer);

    if (UNLIKELY(InspectorInstrumentationPublic::hasFrontends()))
        notifyInspectorOfRendererChange();
}

inline RenderObject* RenderObject::previousInFlowSibling() const
{
    auto* previousSibling = this->previousSibling();
    while (previousSibling && !previousSibling->isInFlow())
        previousSibling = previousSibling->previousSibling();
    return previousSibling;
}

inline RenderObject* RenderObject::nextInFlowSibling() const
{
    auto* nextSibling = this->nextSibling();
    while (nextSibling && !nextSibling->isInFlow())
        nextSibling = nextSibling->nextSibling();
    return nextSibling;
}

inline bool RenderObject::isAtomicInlineLevelBox() const
{
    return style().isDisplayInlineType() && !(style().display() == DisplayType::Inline && !isReplacedOrInlineBlock());
}

inline bool RenderObject::hasPotentiallyScrollableOverflow() const
{
    // We only need to test one overflow dimension since 'visible' and 'clip' always get accompanied
    // with 'clip' or 'visible' in the other dimension (see Style::Adjuster::adjust).
    return hasNonVisibleOverflow() && style().overflowX() != Overflow::Clip && style().overflowX() != Overflow::Visible;
}

WTF::TextStream& operator<<(WTF::TextStream&, const RenderObject&);

#if ENABLE(TREE_DEBUGGING)
void printPaintOrderTreeForLiveDocuments();
void printRenderTreeForLiveDocuments();
void printLayerTreeForLiveDocuments();
void printGraphicsLayerTreeForLiveDocuments();
#endif

} // namespace WebCore

#define SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
    static bool isType(const WebCore::RenderObject& renderer) { return renderer.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()

#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from the debugger.
void showNodeTree(const WebCore::RenderObject*);
void showLineTree(const WebCore::RenderObject*);
void showRenderTree(const WebCore::RenderObject*);
#endif
