blob: 618de57e7907fea4c874d6c94bbe8bb2ce6e1d32 [file] [log] [blame]
* Copyright (C) 2000 Lars Knoll (
* (C) 2000 Antti Koivisto (
* (C) 2000 Dirk Mueller (
* (C) 2004 Allan Sandfeld Jensen (
* 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
* 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/rendering/HitTestRequest.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/compositing/CompositingState.h"
#include "core/rendering/compositing/CompositingTriggers.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/transforms/TransformationMatrix.h"
namespace blink {
class AffineTransform;
class Cursor;
class Document;
class HitTestLocation;
class HitTestResult;
class InlineBox;
class InlineFlowBox;
class Position;
class PositionWithAffinity;
class PseudoStyleRequest;
class RenderBoxModelObject;
class RenderBlock;
class RenderFlowThread;
class RenderGeometryMap;
class RenderLayer;
class RenderLayerModelObject;
class RenderView;
class TransformState;
struct PaintInfo;
enum CursorDirective {
enum HitTestFilter {
enum HitTestAction {
enum MarkingBehavior {
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 RenderLayer*, Vector<LayoutRect> > LayerHitTestRects;
#ifndef NDEBUG
const int showTreeCharacterOffset = 39;
// Base class for all rendering tree objects.
class RenderObject : public NoBaseWillBeGarbageCollectedFinalized<RenderObject>, public ImageResourceClient {
friend class RenderBlock;
friend class RenderBlockFlow;
friend class RenderLayerReflectionInfo; // For setParent
friend class RenderLayerScrollableArea; // For setParent.
friend class RenderObjectChildList;
// 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 void trace(Visitor*);
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.
RenderLayer* enclosingLayer() const;
void addLayers(RenderLayer* parentLayer);
void removeLayers(RenderLayer* parentLayer);
void moveLayers(RenderLayer* oldParent, RenderLayer* newParent);
RenderLayer* findNextLayer(RenderLayer* 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();
void setHasAXObject(bool flag) { m_hasAXObject = flag; }
bool hasAXObject() const { return m_hasAXObject; }
// Helper class forbidding calls to setNeedsLayout() during its lifetime.
class SetLayoutNeededForbiddenScope {
explicit SetLayoutNeededForbiddenScope(RenderObject&);
RenderObject& m_renderObject;
bool m_preexistingForbidden;
void assertRendererLaidOut() const
#ifndef NDEBUG
if (needsLayout())
void assertSubtreeIsLaidOut() const
for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
void assertRendererClearedPaintInvalidationState() const
#ifndef NDEBUG
if (paintInvalidationStateIsDirty()) {
void assertSubtreeClearedPaintInvalidationState() const
for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
// 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; }
// 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())
bool isSetNeedsLayoutForbidden() const { return m_setNeedsLayoutForbidden; }
void setNeedsLayoutIsForbidden(bool flag) { m_setNeedsLayoutForbidden = flag; }
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;
#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;
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*);
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 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 isRenderMultiColumnSpannerSet() const { return isOfType(RenderObjectRenderMultiColumnSpannerSet); }
bool isRenderRegion() const { return isOfType(RenderObjectRenderRegion); }
bool isRenderScrollbarPart() const { return isOfType(RenderObjectRenderScrollbarPart); }
bool isRenderTableCol() const { return isOfType(RenderObjectRenderTableCol); }
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 isLayerModelObject() 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() || isRenderTableCol() || 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
return m_bitfields.alwaysCreateLineBoxesForRenderInline();
void setAlwaysCreateLineBoxesForRenderInline(bool alwaysCreateLineBoxes)
bool ancestorLineBoxDirty() const { return m_bitfields.ancestorLineBoxDirty(); }
void setAncestorLineBoxDirty(bool value = true)
if (value)
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();
// 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);
virtual bool canHaveWhitespaceChildren() const
if (isTable() || isTableRow() || isTableSection() || isRenderTableCol() || isFrameSet() || isFlexibleBox() || isRenderGrid())
return false;
return true;
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
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 document().containsAnyRareWritingMode()
&& style()->slowIsFlippedBlocksWritingMode();
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 {
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 hasBlendMode() const;
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.get();
Node* nonPseudoNode() const
return isPseudoElement() ? 0 : node();
// FIXME: Why does RenderPart need this?
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 and :after
// 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(); }
// 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 RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
RenderBlock* containerForFixedPosition(const RenderLayerModelObject* 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()
void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation()
void setPositionState(EPosition position)
ASSERT((position != AbsolutePosition && position != FixedPosition) || isBox());
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(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 RenderLayerModelObject* paintInvalidatinoContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0) const;
FloatPoint localToContainerPoint(const FloatPoint&, const RenderLayerModelObject* 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&, RenderLayer** 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(); }
/* The two following methods are inlined in RenderObjectInlines.h */
RenderStyle* firstLineStyle() const;
RenderStyle* style(bool firstLine) const;
inline Color resolveColor(const RenderStyle* styleToUse, int colorProperty) const
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 RenderLayerModelObject 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 RenderLayerModelObject* containerForPaintInvalidation() const;
const RenderLayerModelObject* adjustCompositedContainerForSpecialAncestors(const RenderLayerModelObject* 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 RenderLayerModelObject* 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 RenderLayerModelObject* 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
void invalidatePaintUsingContainer(const RenderLayerModelObject* 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 RenderLayerModelObject&, 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.
LayoutRect absoluteClippedOverflowRect() const;
IntRect pixelSnappedAbsoluteClippedOverflowRect() const;
virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* 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 RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const;
virtual void computeFloatRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, FloatRect& paintInvalidationRect, 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();
// 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 RenderLayerModelObject* /*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;
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 RenderLayerModelObject* 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 RenderLayerModelObject* 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() || hasBlendMode(); }
virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) 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(bool b)
// Make sure our parent is marked as needing invalidation.
if (b)
bool shouldInvalidateSelection() const { return m_bitfields.shouldInvalidateSelection(); }
void setShouldInvalidateSelection()
if (!canUpdateSelectionOnRootLineBoxes())
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();
bool supportsPaintInvalidationStateCachedOffsets() const { return !hasColumns() && !hasTransformRelatedProperty() && !hasReflection() && !style()->slowIsFlippedBlocksWritingMode(); }
void setNeedsOverflowRecalcAfterStyleChange();
void markContainingBlocksForOverflowRecalc();
virtual LayoutRect viewRect() const;
enum RenderObjectType {
RenderObjectSVG, /* Keep by itself? */
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 { }
void paintOutline(PaintInfo&, const LayoutRect&);
void addChildFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const;
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-RenderLayer 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 RenderLayer* 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 RenderLayerModelObject& paintInvalidationContainer,
const LayoutRect& oldPaintInvalidationRect, const LayoutPoint& oldPositionFromPaintInvalidationBacking,
const LayoutRect& newPaintInvalidationRect, const LayoutPoint& newPositionFromPaintInvalidationBacking) const;
virtual void incrementallyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationBacking);
void fullyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, PaintInvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
virtual bool paintInvalidationStateIsDirty() const
return neededLayoutBecauseOfChildren() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
virtual void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState);
virtual PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& paintInvalidationContainer);
void setLayoutDidGetCalledSinceLastFrame()
// Make sure our parent is marked as needing invalidation.
// This would be unneeded if we allowed sub-tree invalidation (akin to sub-tree layouts).
void clearLayoutDidGetCalledSinceLastFrame() { m_bitfields.setLayoutDidGetCalledSinceLastFrame(false); }
void invalidatePaintIncludingNonCompositingDescendantsInternal(const RenderLayerModelObject* repaintContainer);
LayoutRect previousSelectionRectForPaintInvalidation() const;
void setPreviousSelectionRectForPaintInvalidation(const LayoutRect&);
const RenderLayerModelObject* 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*);
void checkBlockPositionedObjectsNeedLayout();
void markContainingBlockChainForPaintInvalidation()
for (RenderObject* container = this->container(); container && !container->shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState(); container = container->container())
static bool isAllowedToModifyRenderTreeStructure(Document&);
RefPtr<RenderStyle> m_style;
RawPtrWillBeMember<Node> m_node;
RawPtrWillBeMember<RenderObject> m_parent;
RawPtrWillBeMember<RenderObject> m_previous;
RawPtrWillBeMember<RenderObject> m_next;
unsigned m_hasAXObject : 1;
unsigned m_setNeedsLayoutForbidden : 1;
unsigned m_didCallDestroy : 1;
#define ADD_BOOLEAN_BITFIELD(name, Name) \
unsigned m_##name : 1;\
bool name() const { return m_##name; }\
void set##Name(bool name) { m_##name = name; }\
class RenderObjectBitfields {
enum PositionedState {
IsStaticallyPositioned = 0,
IsRelativelyPositioned = 1,
IsOutOfFlowPositioned = 2,
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.
, 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(isReplaced, IsReplaced);
ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode);
ADD_BOOLEAN_BITFIELD(isDragging, IsDragging);
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);
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
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; }
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); }
// 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 {
static bool canModifyRenderTreeStateInAnyState();
TemporaryChange<bool> m_disabler;
// Allow equality comparisons of RenderObjects by reference or pointer, interchangeably.
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)
bool alreadyNeededLayout = m_bitfields.selfNeedsLayout();
if (!alreadyNeededLayout) {
if (markParents == MarkContainingBlockChain && (!layouter || layouter->root() != this))
markContainingBlocksForLayout(true, 0, layouter);
inline void RenderObject::setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
setNeedsLayout(markParents, layouter);
inline void RenderObject::clearNeedsLayout()
inline void RenderObject::setChildNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
bool alreadyNeededLayout = normalChildNeedsLayout();
// 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();
if (!alreadyNeededLayout)
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)
inline void RenderObject::setHasBoxDecorationBackground(bool b)
if (!b) {
if (hasBoxDecorationBackground())
inline void RenderObject::invalidateBackgroundObscurationStatus()
if (!hasBoxDecorationBackground())
inline bool RenderObject::boxDecorationBackgroundIsKnownToBeObscured()
if (m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundObscurationStatusInvalid) {
BoxDecorationBackgroundState state = computeBackgroundIsKnownToBeObscured() ? HasBoxDecorationBackgroundKnownToBeObscured : HasBoxDecorationBackgroundMayBeVisible;
return m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundKnownToBeObscured;
inline void makeMatrixRenderable(TransformationMatrix& matrix, bool has3DRendering)
if (!has3DRendering)
inline int adjustForAbsoluteZoom(int value, RenderObject* renderer)
return adjustForAbsoluteZoom(value, renderer->style());
inline double adjustDoubleForAbsoluteZoom(double value, RenderObject& renderer)
return adjustDoubleForAbsoluteZoom(value, *;
inline LayoutUnit adjustLayoutUnitForAbsoluteZoom(LayoutUnit value, RenderObject& renderer)
return adjustLayoutUnitForAbsoluteZoom(value, *;
inline void adjustFloatQuadForAbsoluteZoom(FloatQuad& quad, RenderObject& renderer)
float zoom =>effectiveZoom();
if (zoom != 1)
quad.scale(1 / zoom, 1 / zoom);
inline void adjustFloatRectForAbsoluteZoom(FloatRect& rect, RenderObject& renderer)
float zoom =>effectiveZoom();
if (zoom != 1)
rect.scale(1 / zoom, 1 / zoom);
inline double adjustScrollForAbsoluteZoom(double value, RenderObject& renderer)
return adjustScrollForAbsoluteZoom(value, *;
#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 // RenderObject_h