Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 2809 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/RenderObject.cpp b/Source/WebCore/rendering/RenderObject.cpp
new file mode 100755
index 000000000..1f1eb26c8
--- /dev/null
+++ b/Source/WebCore/rendering/RenderObject.cpp
@@ -0,0 +1,2809 @@
+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ *           (C) 2000 Dirk Mueller (mueller@kde.org)
+ *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ *
+ * 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.
+ *
+ */
+
+#include "config.h"
+#include "RenderObject.h"
+
+#include "AXObjectCache.h"
+#include "CSSStyleSelector.h"
+#include "Chrome.h"
+#include "ContentData.h"
+#include "CursorList.h"
+#include "DashArray.h"
+#include "EditingBoundary.h"
+#include "FloatQuad.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLNames.h"
+#include "HitTestResult.h"
+#include "Page.h"
+#include "RenderArena.h"
+#include "RenderCounter.h"
+#include "RenderDeprecatedFlexibleBox.h"
+#include "RenderFlexibleBox.h"
+#include "RenderFlowThread.h"
+#include "RenderImage.h"
+#include "RenderImageResourceStyleImage.h"
+#include "RenderInline.h"
+#include "RenderLayer.h"
+#include "RenderListItem.h"
+#include "RenderRegion.h"
+#include "RenderRuby.h"
+#include "RenderRubyText.h"
+#include "RenderTableCaption.h"
+#include "RenderTableCell.h"
+#include "RenderTableCol.h"
+#include "RenderTableRow.h"
+#include "RenderTheme.h"
+#include "RenderView.h"
+#include "TransformState.h"
+#include "htmlediting.h"
+#include <algorithm>
+#include <stdio.h>
+#include <wtf/RefCountedLeakCounter.h>
+#include <wtf/UnusedParam.h>
+
+#if USE(ACCELERATED_COMPOSITING)
+#include "RenderLayerCompositor.h"
+#endif
+
+#if ENABLE(SVG)
+#include "RenderSVGResourceContainer.h"
+#include "SVGRenderSupport.h"
+#endif
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+#ifndef NDEBUG
+static void* baseOfRenderObjectBeingDeleted;
+#endif
+
+struct SameSizeAsRenderObject {
+    virtual ~SameSizeAsRenderObject() { } // Allocate vtable pointer.
+    void* pointers[5];
+#ifndef NDEBUG
+    unsigned m_debugBitfields : 2;
+#endif
+    unsigned m_bitfields;
+};
+
+COMPILE_ASSERT(sizeof(RenderObject) == sizeof(SameSizeAsRenderObject), RenderObject_should_stay_small);
+
+bool RenderObject::s_affectsParentBlock = false;
+
+void* RenderObject::operator new(size_t sz, RenderArena* renderArena)
+{
+    return renderArena->allocate(sz);
+}
+
+void RenderObject::operator delete(void* ptr, size_t sz)
+{
+    ASSERT(baseOfRenderObjectBeingDeleted == ptr);
+
+    // Stash size where destroy can find it.
+    *(size_t *)ptr = sz;
+}
+
+RenderObject* RenderObject::createObject(Node* node, RenderStyle* style)
+{
+    Document* doc = node->document();
+    RenderArena* arena = doc->renderArena();
+
+    // Minimal support for content properties replacing an entire element.
+    // Works only if we have exactly one piece of content and it's a URL.
+    // Otherwise acts as if we didn't support this feature.
+    const ContentData* contentData = style->contentData();
+    if (contentData && !contentData->next() && contentData->isImage() && doc != node) {
+        RenderImage* image = new (arena) RenderImage(node);
+        image->setStyle(style);
+        if (const StyleImage* styleImage = static_cast<const ImageContentData*>(contentData)->image()) {
+            image->setImageResource(RenderImageResourceStyleImage::create(const_cast<StyleImage*>(styleImage)));
+            image->setIsGeneratedContent();
+        } else
+            image->setImageResource(RenderImageResource::create());
+        return image;
+    }
+
+    if (node->hasTagName(rubyTag)) {
+        if (style->display() == INLINE)
+            return new (arena) RenderRubyAsInline(node);
+        else if (style->display() == BLOCK)
+            return new (arena) RenderRubyAsBlock(node);
+    }
+    // treat <rt> as ruby text ONLY if it still has its default treatment of block
+    if (node->hasTagName(rtTag) && style->display() == BLOCK)
+        return new (arena) RenderRubyText(node);
+
+    switch (style->display()) {
+#if ENABLE(CSS_GRID_LAYOUT)
+    // For now, we don't show grid elements.
+    case GRID:
+    case INLINE_GRID:
+#endif
+    case NONE:
+        return 0;
+    case INLINE:
+        return new (arena) RenderInline(node);
+    case BLOCK:
+    case INLINE_BLOCK:
+    case RUN_IN:
+    case COMPACT:
+        // Only non-replaced block elements can become a region.
+        if (!style->regionThread().isEmpty() && doc->renderView())
+            return new (arena) RenderRegion(node, doc->renderView()->ensureRenderFlowThreadWithName(style->regionThread()));
+        return new (arena) RenderBlock(node);
+    case LIST_ITEM:
+        return new (arena) RenderListItem(node);
+    case TABLE:
+    case INLINE_TABLE:
+        return new (arena) RenderTable(node);
+    case TABLE_ROW_GROUP:
+    case TABLE_HEADER_GROUP:
+    case TABLE_FOOTER_GROUP:
+        return new (arena) RenderTableSection(node);
+    case TABLE_ROW:
+        return new (arena) RenderTableRow(node);
+    case TABLE_COLUMN_GROUP:
+    case TABLE_COLUMN:
+        return new (arena) RenderTableCol(node);
+    case TABLE_CELL:
+        return new (arena) RenderTableCell(node);
+    case TABLE_CAPTION:
+        return new (arena) RenderTableCaption(node);
+    case BOX:
+    case INLINE_BOX:
+        return new (arena) RenderDeprecatedFlexibleBox(node);
+    case FLEXBOX:
+    case INLINE_FLEXBOX:
+        return new (arena) RenderFlexibleBox(node);
+    }
+
+    return 0;
+}
+
+DEFINE_DEBUG_ONLY_GLOBAL(WTF::RefCountedLeakCounter, renderObjectCounter, ("RenderObject"));
+
+RenderObject::RenderObject(Node* node)
+    : CachedImageClient()
+    , m_style(0)
+    , m_node(node)
+    , m_parent(0)
+    , m_previous(0)
+    , m_next(0)
+#ifndef NDEBUG
+    , m_hasAXObject(false)
+    , m_setNeedsLayoutForbidden(false)
+#endif
+    , m_bitfields(node)
+{
+#ifndef NDEBUG
+    renderObjectCounter.increment();
+#endif
+    ASSERT(node);
+}
+
+RenderObject::~RenderObject()
+{
+    ASSERT(!node() || documentBeingDestroyed() || !frame()->view() || frame()->view()->layoutRoot() != this);
+#ifndef NDEBUG
+    ASSERT(!m_hasAXObject);
+    renderObjectCounter.decrement();
+#endif
+}
+
+RenderTheme* RenderObject::theme() const
+{
+    ASSERT(document()->page());
+
+    return document()->page()->theme();
+}
+
+bool RenderObject::isDescendantOf(const RenderObject* obj) const
+{
+    for (const RenderObject* r = this; r; r = r->m_parent) {
+        if (r == obj)
+            return true;
+    }
+    return false;
+}
+
+bool RenderObject::isBody() const
+{
+    return node() && node()->hasTagName(bodyTag);
+}
+
+bool RenderObject::isHR() const
+{
+    return node() && node()->hasTagName(hrTag);
+}
+
+bool RenderObject::isLegend() const
+{
+    return node() && node()->hasTagName(legendTag);
+}
+
+bool RenderObject::isHTMLMarquee() const
+{
+    return node() && node()->renderer() == this && node()->hasTagName(marqueeTag);
+}
+
+static bool isBeforeAfterContentGeneratedByAncestor(RenderObject* renderer, RenderObject* beforeAfterContent)
+{
+    while (renderer) {
+        if (renderer->generatingNode() == beforeAfterContent->generatingNode())
+            return true;
+        renderer = renderer->parent();
+    }
+    return false;
+}
+
+void RenderObject::addChild(RenderObject* newChild, RenderObject* beforeChild)
+{
+    RenderObjectChildList* children = virtualChildren();
+    ASSERT(children);
+    if (!children)
+        return;
+
+    RenderObject* beforeContent = 0;
+    bool beforeChildHasBeforeAndAfterContent = false;
+    if (beforeChild && (beforeChild->isTable() || beforeChild->isTableSection() || beforeChild->isTableRow() || beforeChild->isTableCell())) {
+        beforeContent = beforeChild->beforePseudoElementRenderer();
+        RenderObject* afterContent = beforeChild->afterPseudoElementRenderer();
+        if (beforeContent && afterContent && isBeforeAfterContentGeneratedByAncestor(this, beforeContent)) {
+            beforeChildHasBeforeAndAfterContent = true;
+            beforeContent->destroy();
+        }
+    }
+
+    bool needsTable = false;
+
+    if (newChild->isTableCol() && newChild->style()->display() == TABLE_COLUMN_GROUP)
+        needsTable = !isTable();
+    else if (newChild->isTableCaption())
+        needsTable = !isTable();
+    else if (newChild->isTableSection())
+        needsTable = !isTable();
+    else if (newChild->isTableRow())
+        needsTable = !isTableSection();
+    else if (newChild->isTableCell()) {
+        needsTable = !isTableRow();
+        // I'm not 100% sure this is the best way to fix this, but without this
+        // change we recurse infinitely when trying to render the CSS2 test page:
+        // http://www.bath.ac.uk/%7Epy8ieh/internet/eviltests/htmlbodyheadrendering2.html.
+        // See Radar 2925291.
+        if (needsTable && isTableCell() && !children->firstChild() && !newChild->isTableCell())
+            needsTable = false;
+    }
+
+    if (needsTable) {
+        RenderTable* table;
+        RenderObject* afterChild = beforeChild ? beforeChild->previousSibling() : children->lastChild();
+        if (afterChild && afterChild->isAnonymous() && afterChild->isTable() && !afterChild->isBeforeContent())
+            table = toRenderTable(afterChild);
+        else {
+            table = new (renderArena()) RenderTable(document() /* is anonymous */);
+            RefPtr<RenderStyle> newStyle = RenderStyle::create();
+            newStyle->inheritFrom(style());
+            newStyle->setDisplay(TABLE);
+            table->setStyle(newStyle.release());
+            addChild(table, beforeChild);
+        }
+        table->addChild(newChild);
+    } else {
+        // Just add it...
+        children->insertChildNode(this, newChild, beforeChild);
+    }
+
+    if (newChild->isText() && newChild->style()->textTransform() == CAPITALIZE) {
+        RefPtr<StringImpl> textToTransform = toRenderText(newChild)->originalText();
+        if (textToTransform)
+            toRenderText(newChild)->setText(textToTransform.release(), true);
+    }
+
+    if (beforeChildHasBeforeAndAfterContent)
+        children->updateBeforeAfterContent(this, BEFORE);
+}
+
+void RenderObject::removeChild(RenderObject* oldChild)
+{
+    RenderObjectChildList* children = virtualChildren();
+    ASSERT(children);
+    if (!children)
+        return;
+
+    // We do this here instead of in removeChildNode, since the only extremely low-level uses of remove/appendChildNode
+    // cannot affect the positioned object list, and the floating object list is irrelevant (since the list gets cleared on
+    // layout anyway).
+    if (oldChild->isFloatingOrPositioned())
+        toRenderBox(oldChild)->removeFloatingOrPositionedChildFromBlockLists();
+        
+    children->removeChildNode(this, oldChild);
+}
+
+RenderObject* RenderObject::nextInPreOrder() const
+{
+    if (RenderObject* o = firstChild())
+        return o;
+
+    return nextInPreOrderAfterChildren();
+}
+
+RenderObject* RenderObject::nextInPreOrderAfterChildren() const
+{
+    RenderObject* o;
+    if (!(o = nextSibling())) {
+        o = parent();
+        while (o && !o->nextSibling())
+            o = o->parent();
+        if (o)
+            o = o->nextSibling();
+    }
+
+    return o;
+}
+
+RenderObject* RenderObject::nextInPreOrder(const RenderObject* stayWithin) const
+{
+    if (RenderObject* o = firstChild())
+        return o;
+
+    return nextInPreOrderAfterChildren(stayWithin);
+}
+
+RenderObject* RenderObject::nextInPreOrderAfterChildren(const RenderObject* stayWithin) const
+{
+    if (this == stayWithin)
+        return 0;
+
+    const RenderObject* current = this;
+    RenderObject* next;
+    while (!(next = current->nextSibling())) {
+        current = current->parent();
+        if (!current || current == stayWithin)
+            return 0;
+    }
+    return next;
+}
+
+RenderObject* RenderObject::previousInPreOrder() const
+{
+    if (RenderObject* o = previousSibling()) {
+        while (o->lastChild())
+            o = o->lastChild();
+        return o;
+    }
+
+    return parent();
+}
+
+RenderObject* RenderObject::childAt(unsigned index) const
+{
+    RenderObject* child = firstChild();
+    for (unsigned i = 0; child && i < index; i++)
+        child = child->nextSibling();
+    return child;
+}
+
+RenderObject* RenderObject::firstLeafChild() const
+{
+    RenderObject* r = firstChild();
+    while (r) {
+        RenderObject* n = 0;
+        n = r->firstChild();
+        if (!n)
+            break;
+        r = n;
+    }
+    return r;
+}
+
+RenderObject* RenderObject::lastLeafChild() const
+{
+    RenderObject* r = lastChild();
+    while (r) {
+        RenderObject* n = 0;
+        n = r->lastChild();
+        if (!n)
+            break;
+        r = n;
+    }
+    return r;
+}
+
+static void addLayers(RenderObject* obj, RenderLayer* parentLayer, RenderObject*& newObject,
+                      RenderLayer*& beforeChild)
+{
+    if (obj->hasLayer()) {
+        if (!beforeChild && newObject) {
+            // We need to figure out the layer that follows newObject.  We only do
+            // this the first time we find a child layer, and then we update the
+            // pointer values for newObject and beforeChild used by everyone else.
+            beforeChild = newObject->parent()->findNextLayer(parentLayer, newObject);
+            newObject = 0;
+        }
+        parentLayer->addChild(toRenderBoxModelObject(obj)->layer(), beforeChild);
+        return;
+    }
+
+    for (RenderObject* curr = obj->firstChild(); curr; curr = curr->nextSibling())
+        addLayers(curr, parentLayer, newObject, beforeChild);
+}
+
+void RenderObject::addLayers(RenderLayer* parentLayer)
+{
+    if (!parentLayer)
+        return;
+
+    RenderObject* object = this;
+    RenderLayer* beforeChild = 0;
+    WebCore::addLayers(this, parentLayer, object, beforeChild);
+}
+
+void RenderObject::removeLayers(RenderLayer* parentLayer)
+{
+    if (!parentLayer)
+        return;
+
+    if (hasLayer()) {
+        parentLayer->removeChild(toRenderBoxModelObject(this)->layer());
+        return;
+    }
+
+    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
+        curr->removeLayers(parentLayer);
+}
+
+void RenderObject::moveLayers(RenderLayer* oldParent, RenderLayer* newParent)
+{
+    if (!newParent)
+        return;
+
+    if (hasLayer()) {
+        RenderLayer* layer = toRenderBoxModelObject(this)->layer();
+        ASSERT(oldParent == layer->parent());
+        if (oldParent)
+            oldParent->removeChild(layer);
+        newParent->addChild(layer);
+        return;
+    }
+
+    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
+        curr->moveLayers(oldParent, newParent);
+}
+
+RenderLayer* RenderObject::findNextLayer(RenderLayer* parentLayer, RenderObject* startPoint,
+                                         bool checkParent)
+{
+    // Error check the parent layer passed in.  If it's null, we can't find anything.
+    if (!parentLayer)
+        return 0;
+
+    // Step 1: If our layer is a child of the desired parent, then return our layer.
+    RenderLayer* ourLayer = hasLayer() ? toRenderBoxModelObject(this)->layer() : 0;
+    if (ourLayer && ourLayer->parent() == parentLayer)
+        return ourLayer;
+
+    // Step 2: If we don't have a layer, or our layer is the desired parent, then descend
+    // into our siblings trying to find the next layer whose parent is the desired parent.
+    if (!ourLayer || ourLayer == parentLayer) {
+        for (RenderObject* curr = startPoint ? startPoint->nextSibling() : firstChild();
+             curr; curr = curr->nextSibling()) {
+            RenderLayer* nextLayer = curr->findNextLayer(parentLayer, 0, false);
+            if (nextLayer)
+                return nextLayer;
+        }
+    }
+
+    // Step 3: If our layer is the desired parent layer, then we're finished.  We didn't
+    // find anything.
+    if (parentLayer == ourLayer)
+        return 0;
+
+    // Step 4: If |checkParent| is set, climb up to our parent and check its siblings that
+    // follow us to see if we can locate a layer.
+    if (checkParent && parent())
+        return parent()->findNextLayer(parentLayer, this, true);
+
+    return 0;
+}
+
+RenderLayer* RenderObject::enclosingLayer() const
+{
+    const RenderObject* curr = this;
+    while (curr) {
+        RenderLayer* layer = curr->hasLayer() ? toRenderBoxModelObject(curr)->layer() : 0;
+        if (layer)
+            return layer;
+        curr = curr->parent();
+    }
+    return 0;
+}
+
+RenderBox* RenderObject::enclosingBox() const
+{
+    RenderObject* curr = const_cast<RenderObject*>(this);
+    while (curr) {
+        if (curr->isBox())
+            return toRenderBox(curr);
+        curr = curr->parent();
+    }
+    
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+RenderBoxModelObject* RenderObject::enclosingBoxModelObject() const
+{
+    RenderObject* curr = const_cast<RenderObject*>(this);
+    while (curr) {
+        if (curr->isBoxModelObject())
+            return toRenderBoxModelObject(curr);
+        curr = curr->parent();
+    }
+
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+RenderFlowThread* RenderObject::enclosingRenderFlowThread() const
+{   
+    if (!inRenderFlowThread())
+        return 0;
+    
+    // See if we have the thread cached because we're in the middle of layout.
+    RenderFlowThread* flowThread = view()->currentRenderFlowThread();
+    if (flowThread)
+        return flowThread;
+    
+    // Not in the middle of layout so have to find the thread the slow way.
+    RenderObject* curr = const_cast<RenderObject*>(this);
+    while (curr) {
+        if (curr->isRenderFlowThread())
+            return toRenderFlowThread(curr);
+        curr = curr->parent();
+    }
+    return 0;
+}
+
+RenderBlock* RenderObject::firstLineBlock() const
+{
+    return 0;
+}
+
+static inline bool objectIsRelayoutBoundary(const RenderObject* object)
+{
+    // FIXME: In future it may be possible to broaden this condition in order to improve performance.
+    // Table cells are excluded because even when their CSS height is fixed, their height()
+    // may depend on their contents.
+    return object->isTextControl()
+#if ENABLE(SVG)
+        || object->isSVGRoot()
+#endif
+        || (object->hasOverflowClip() && !object->style()->width().isIntrinsicOrAuto() && !object->style()->height().isIntrinsicOrAuto() && !object->style()->height().isPercent() && !object->isTableCell());
+}
+
+void RenderObject::markContainingBlocksForLayout(bool scheduleRelayout, RenderObject* newRoot)
+{
+    ASSERT(!scheduleRelayout || !newRoot);
+
+    RenderObject* object = container();
+    RenderObject* last = this;
+
+    bool simplifiedNormalFlowLayout = needsSimplifiedNormalFlowLayout() && !selfNeedsLayout() && !normalChildNeedsLayout();
+
+    while (object) {
+        // Don't mark the outermost object of an unrooted subtree. That object will be
+        // marked when the subtree is added to the document.
+        RenderObject* container = object->container();
+        if (!container && !object->isRenderView())
+            return;
+        if (!last->isText() && (last->style()->position() == FixedPosition || last->style()->position() == AbsolutePosition)) {
+            bool willSkipRelativelyPositionedInlines = !object->isRenderBlock();
+            while (object && !object->isRenderBlock()) // Skip relatively positioned inlines and get to the enclosing RenderBlock.
+                object = object->container();
+            if (!object || object->posChildNeedsLayout())
+                return;
+            if (willSkipRelativelyPositionedInlines)
+                container = object->container();
+            object->setPosChildNeedsLayout(true);
+            simplifiedNormalFlowLayout = true;
+            ASSERT(!object->isSetNeedsLayoutForbidden());
+        } else if (simplifiedNormalFlowLayout) {
+            if (object->needsSimplifiedNormalFlowLayout())
+                return;
+            object->setNeedsSimplifiedNormalFlowLayout(true);
+            ASSERT(!object->isSetNeedsLayoutForbidden());
+        } else {
+            if (object->normalChildNeedsLayout())
+                return;
+            object->setNormalChildNeedsLayout(true);
+            ASSERT(!object->isSetNeedsLayoutForbidden());
+        }
+
+        if (object == newRoot)
+            return;
+
+        last = object;
+        if (scheduleRelayout && objectIsRelayoutBoundary(last))
+            break;
+        object = container;
+    }
+
+    if (scheduleRelayout)
+        last->scheduleRelayout();
+}
+
+void RenderObject::setPreferredLogicalWidthsDirty(bool b, bool markParents)
+{
+    bool alreadyDirty = preferredLogicalWidthsDirty();
+    m_bitfields.setPreferredLogicalWidthsDirty(b);
+    if (b && !alreadyDirty && markParents && (isText() || (style()->position() != FixedPosition && style()->position() != AbsolutePosition)))
+        invalidateContainerPreferredLogicalWidths();
+}
+
+void RenderObject::invalidateContainerPreferredLogicalWidths()
+{
+    // In order to avoid pathological behavior when inlines are deeply nested, we do include them
+    // in the chain that we mark dirty (even though they're kind of irrelevant).
+    RenderObject* o = isTableCell() ? containingBlock() : container();
+    while (o && !o->preferredLogicalWidthsDirty()) {
+        // Don't invalidate the outermost object of an unrooted subtree. That object will be 
+        // invalidated when the subtree is added to the document.
+        RenderObject* container = o->isTableCell() ? o->containingBlock() : o->container();
+        if (!container && !o->isRenderView())
+            break;
+
+        o->m_bitfields.setPreferredLogicalWidthsDirty(true);
+        if (o->style()->position() == FixedPosition || o->style()->position() == AbsolutePosition)
+            // A positioned object has no effect on the min/max width of its containing block ever.
+            // We can optimize this case and not go up any further.
+            break;
+        o = container;
+    }
+}
+
+void RenderObject::setLayerNeedsFullRepaint()
+{
+    ASSERT(hasLayer());
+    toRenderBoxModelObject(this)->layer()->setRepaintStatus(NeedsFullRepaint);
+}
+
+void RenderObject::setLayerNeedsFullRepaintForPositionedMovementLayout()
+{
+    ASSERT(hasLayer());
+    toRenderBoxModelObject(this)->layer()->setRepaintStatus(NeedsFullRepaintForPositionedMovementLayout);
+}
+
+RenderBlock* RenderObject::containingBlock() const
+{
+    RenderObject* o = parent();
+    if (!isText() && m_style->position() == FixedPosition) {
+        while (o && !o->isRenderView() && !(o->hasTransform() && o->isRenderBlock()))
+            o = o->parent();
+    } else if (!isText() && m_style->position() == AbsolutePosition) {
+        while (o && (o->style()->position() == StaticPosition || (o->isInline() && !o->isReplaced())) && !o->isRenderView() && !(o->hasTransform() && o->isRenderBlock())) {
+            // For relpositioned inlines, we return the nearest non-anonymous enclosing block. We don't try
+            // to return the inline itself.  This allows us to avoid having a positioned objects
+            // list in all RenderInlines and lets us return a strongly-typed RenderBlock* result
+            // from this method.  The container() method can actually be used to obtain the
+            // inline directly.
+            if (o->style()->position() == RelativePosition && o->isInline() && !o->isReplaced()) {
+                RenderBlock* relPositionedInlineContainingBlock = o->containingBlock();
+                while (relPositionedInlineContainingBlock->isAnonymousBlock())
+                    relPositionedInlineContainingBlock = relPositionedInlineContainingBlock->containingBlock();
+                return relPositionedInlineContainingBlock;
+            }
+#if ENABLE(SVG)
+            if (o->isSVGForeignObject()) //foreignObject is the containing block for contents inside it
+                break;
+#endif
+
+            o = o->parent();
+        }
+    } else {
+        while (o && ((o->isInline() && !o->isReplaced()) || !o->isRenderBlock()))
+            o = o->parent();
+    }
+
+    if (!o || !o->isRenderBlock())
+        return 0; // This can still happen in case of an orphaned tree
+
+    return toRenderBlock(o);
+}
+
+static bool mustRepaintFillLayers(const RenderObject* renderer, const FillLayer* layer)
+{
+    // Nobody will use multiple layers without wanting fancy positioning.
+    if (layer->next())
+        return true;
+
+    // Make sure we have a valid image.
+    StyleImage* img = layer->image();
+    if (!img || !img->canRender(renderer, renderer->style()->effectiveZoom()))
+        return false;
+
+    if (!layer->xPosition().isZero() || !layer->yPosition().isZero())
+        return true;
+
+    if (layer->size().type == SizeLength) {
+        if (layer->size().size.width().isPercent() || layer->size().size.height().isPercent())
+            return true;
+    } else if (layer->size().type == Contain || layer->size().type == Cover || img->usesImageContainerSize())
+        return true;
+
+    return false;
+}
+
+bool RenderObject::borderImageIsLoadedAndCanBeRendered() const
+{
+    ASSERT(style()->hasBorder());
+
+    StyleImage* borderImage = style()->borderImage().image();
+    return borderImage && borderImage->canRender(this, style()->effectiveZoom()) && borderImage->isLoaded();
+}
+
+bool RenderObject::mustRepaintBackgroundOrBorder() const
+{
+    if (hasMask() && mustRepaintFillLayers(this, style()->maskLayers()))
+        return true;
+
+    // If we don't have a background/border/mask, then nothing to do.
+    if (!hasBoxDecorations())
+        return false;
+
+    if (mustRepaintFillLayers(this, style()->backgroundLayers()))
+        return true;
+     
+    // Our fill layers are ok.  Let's check border.
+    if (style()->hasBorder() && borderImageIsLoadedAndCanBeRendered())
+        return true;
+
+    return false;
+}
+
+void RenderObject::drawLineForBoxSide(GraphicsContext* graphicsContext, LayoutUnit x1, LayoutUnit y1, LayoutUnit x2, LayoutUnit y2,
+                                      BoxSide side, Color color, EBorderStyle style,
+                                      int adjacentWidth1, int adjacentWidth2, bool antialias)
+{
+    int width = (side == BSTop || side == BSBottom ? y2 - y1 : x2 - x1);
+
+    if (style == DOUBLE && width < 3)
+        style = SOLID;
+
+    switch (style) {
+        case BNONE:
+        case BHIDDEN:
+            return;
+        case DOTTED:
+        case DASHED: {
+            graphicsContext->setStrokeColor(color, m_style->colorSpace());
+            graphicsContext->setStrokeThickness(width);
+            StrokeStyle oldStrokeStyle = graphicsContext->strokeStyle();
+            graphicsContext->setStrokeStyle(style == DASHED ? DashedStroke : DottedStroke);
+
+            if (width > 0) {
+                bool wasAntialiased = graphicsContext->shouldAntialias();
+                graphicsContext->setShouldAntialias(antialias);
+
+                switch (side) {
+                    case BSBottom:
+                    case BSTop:
+                        graphicsContext->drawLine(IntPoint(x1, (y1 + y2) / 2), IntPoint(x2, (y1 + y2) / 2));
+                        break;
+                    case BSRight:
+                    case BSLeft:
+                        graphicsContext->drawLine(IntPoint((x1 + x2) / 2, y1), IntPoint((x1 + x2) / 2, y2));
+                        break;
+                }
+                graphicsContext->setShouldAntialias(wasAntialiased);
+                graphicsContext->setStrokeStyle(oldStrokeStyle);
+            }
+            break;
+        }
+        case DOUBLE: {
+            int third = (width + 1) / 3;
+
+            if (adjacentWidth1 == 0 && adjacentWidth2 == 0) {
+                StrokeStyle oldStrokeStyle = graphicsContext->strokeStyle();
+                graphicsContext->setStrokeStyle(NoStroke);
+                graphicsContext->setFillColor(color, m_style->colorSpace());
+                
+                bool wasAntialiased = graphicsContext->shouldAntialias();
+                graphicsContext->setShouldAntialias(antialias);
+
+                switch (side) {
+                    case BSTop:
+                    case BSBottom:
+                        graphicsContext->drawRect(IntRect(x1, y1, x2 - x1, third));
+                        graphicsContext->drawRect(IntRect(x1, y2 - third, x2 - x1, third));
+                        break;
+                    case BSLeft:
+                        graphicsContext->drawRect(IntRect(x1, y1 + 1, third, y2 - y1 - 1));
+                        graphicsContext->drawRect(IntRect(x2 - third, y1 + 1, third, y2 - y1 - 1));
+                        break;
+                    case BSRight:
+                        graphicsContext->drawRect(IntRect(x1, y1 + 1, third, y2 - y1 - 1));
+                        graphicsContext->drawRect(IntRect(x2 - third, y1 + 1, third, y2 - y1 - 1));
+                        break;
+                }
+
+                graphicsContext->setShouldAntialias(wasAntialiased);
+                graphicsContext->setStrokeStyle(oldStrokeStyle);
+            } else {
+                int adjacent1BigThird = ((adjacentWidth1 > 0) ? adjacentWidth1 + 1 : adjacentWidth1 - 1) / 3;
+                int adjacent2BigThird = ((adjacentWidth2 > 0) ? adjacentWidth2 + 1 : adjacentWidth2 - 1) / 3;
+
+                switch (side) {
+                    case BSTop:
+                        drawLineForBoxSide(graphicsContext, x1 + max((-adjacentWidth1 * 2 + 1) / 3, 0),
+                                   y1, x2 - max((-adjacentWidth2 * 2 + 1) / 3, 0), y1 + third,
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        drawLineForBoxSide(graphicsContext, x1 + max((adjacentWidth1 * 2 + 1) / 3, 0),
+                                   y2 - third, x2 - max((adjacentWidth2 * 2 + 1) / 3, 0), y2,
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        break;
+                    case BSLeft:
+                        drawLineForBoxSide(graphicsContext, x1, y1 + max((-adjacentWidth1 * 2 + 1) / 3, 0),
+                                   x1 + third, y2 - max((-adjacentWidth2 * 2 + 1) / 3, 0),
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        drawLineForBoxSide(graphicsContext, x2 - third, y1 + max((adjacentWidth1 * 2 + 1) / 3, 0),
+                                   x2, y2 - max((adjacentWidth2 * 2 + 1) / 3, 0),
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        break;
+                    case BSBottom:
+                        drawLineForBoxSide(graphicsContext, x1 + max((adjacentWidth1 * 2 + 1) / 3, 0),
+                                   y1, x2 - max((adjacentWidth2 * 2 + 1) / 3, 0), y1 + third,
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        drawLineForBoxSide(graphicsContext, x1 + max((-adjacentWidth1 * 2 + 1) / 3, 0),
+                                   y2 - third, x2 - max((-adjacentWidth2 * 2 + 1) / 3, 0), y2,
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        break;
+                    case BSRight:
+                        drawLineForBoxSide(graphicsContext, x1, y1 + max((adjacentWidth1 * 2 + 1) / 3, 0),
+                                   x1 + third, y2 - max((adjacentWidth2 * 2 + 1) / 3, 0),
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        drawLineForBoxSide(graphicsContext, x2 - third, y1 + max((-adjacentWidth1 * 2 + 1) / 3, 0),
+                                   x2, y2 - max((-adjacentWidth2 * 2 + 1) / 3, 0),
+                                   side, color, SOLID, adjacent1BigThird, adjacent2BigThird, antialias);
+                        break;
+                    default:
+                        break;
+                }
+            }
+            break;
+        }
+        case RIDGE:
+        case GROOVE: {
+            EBorderStyle s1;
+            EBorderStyle s2;
+            if (style == GROOVE) {
+                s1 = INSET;
+                s2 = OUTSET;
+            } else {
+                s1 = OUTSET;
+                s2 = INSET;
+            }
+
+            int adjacent1BigHalf = ((adjacentWidth1 > 0) ? adjacentWidth1 + 1 : adjacentWidth1 - 1) / 2;
+            int adjacent2BigHalf = ((adjacentWidth2 > 0) ? adjacentWidth2 + 1 : adjacentWidth2 - 1) / 2;
+
+            switch (side) {
+                case BSTop:
+                    drawLineForBoxSide(graphicsContext, x1 + max(-adjacentWidth1, 0) / 2, y1, x2 - max(-adjacentWidth2, 0) / 2, (y1 + y2 + 1) / 2,
+                               side, color, s1, adjacent1BigHalf, adjacent2BigHalf, antialias);
+                    drawLineForBoxSide(graphicsContext, x1 + max(adjacentWidth1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(adjacentWidth2 + 1, 0) / 2, y2,
+                               side, color, s2, adjacentWidth1 / 2, adjacentWidth2 / 2, antialias);
+                    break;
+                case BSLeft:
+                    drawLineForBoxSide(graphicsContext, x1, y1 + max(-adjacentWidth1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(-adjacentWidth2, 0) / 2,
+                               side, color, s1, adjacent1BigHalf, adjacent2BigHalf, antialias);
+                    drawLineForBoxSide(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(adjacentWidth1 + 1, 0) / 2, x2, y2 - max(adjacentWidth2 + 1, 0) / 2,
+                               side, color, s2, adjacentWidth1 / 2, adjacentWidth2 / 2, antialias);
+                    break;
+                case BSBottom:
+                    drawLineForBoxSide(graphicsContext, x1 + max(adjacentWidth1, 0) / 2, y1, x2 - max(adjacentWidth2, 0) / 2, (y1 + y2 + 1) / 2,
+                               side, color, s2, adjacent1BigHalf, adjacent2BigHalf, antialias);
+                    drawLineForBoxSide(graphicsContext, x1 + max(-adjacentWidth1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(-adjacentWidth2 + 1, 0) / 2, y2,
+                               side, color, s1, adjacentWidth1 / 2, adjacentWidth2 / 2, antialias);
+                    break;
+                case BSRight:
+                    drawLineForBoxSide(graphicsContext, x1, y1 + max(adjacentWidth1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(adjacentWidth2, 0) / 2,
+                               side, color, s2, adjacent1BigHalf, adjacent2BigHalf, antialias);
+                    drawLineForBoxSide(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(-adjacentWidth1 + 1, 0) / 2, x2, y2 - max(-adjacentWidth2 + 1, 0) / 2,
+                               side, color, s1, adjacentWidth1 / 2, adjacentWidth2 / 2, antialias);
+                    break;
+            }
+            break;
+        }
+        case INSET:
+            // FIXME: Maybe we should lighten the colors on one side like Firefox.
+            // https://bugs.webkit.org/show_bug.cgi?id=58608
+            if (side == BSTop || side == BSLeft)
+                color = color.dark();
+            // fall through
+        case OUTSET:
+            if (style == OUTSET && (side == BSBottom || side == BSRight))
+                color = color.dark();
+            // fall through
+        case SOLID: {
+            StrokeStyle oldStrokeStyle = graphicsContext->strokeStyle();
+            graphicsContext->setStrokeStyle(NoStroke);
+            graphicsContext->setFillColor(color, m_style->colorSpace());
+            ASSERT(x2 >= x1);
+            ASSERT(y2 >= y1);
+            if (!adjacentWidth1 && !adjacentWidth2) {
+                // Turn off antialiasing to match the behavior of drawConvexPolygon();
+                // this matters for rects in transformed contexts.
+                bool wasAntialiased = graphicsContext->shouldAntialias();
+                graphicsContext->setShouldAntialias(antialias);
+                graphicsContext->drawRect(IntRect(x1, y1, x2 - x1, y2 - y1));
+                graphicsContext->setShouldAntialias(wasAntialiased);
+                graphicsContext->setStrokeStyle(oldStrokeStyle);
+                return;
+            }
+            FloatPoint quad[4];
+            switch (side) {
+                case BSTop:
+                    quad[0] = FloatPoint(x1 + max(-adjacentWidth1, 0), y1);
+                    quad[1] = FloatPoint(x1 + max(adjacentWidth1, 0), y2);
+                    quad[2] = FloatPoint(x2 - max(adjacentWidth2, 0), y2);
+                    quad[3] = FloatPoint(x2 - max(-adjacentWidth2, 0), y1);
+                    break;
+                case BSBottom:
+                    quad[0] = FloatPoint(x1 + max(adjacentWidth1, 0), y1);
+                    quad[1] = FloatPoint(x1 + max(-adjacentWidth1, 0), y2);
+                    quad[2] = FloatPoint(x2 - max(-adjacentWidth2, 0), y2);
+                    quad[3] = FloatPoint(x2 - max(adjacentWidth2, 0), y1);
+                    break;
+                case BSLeft:
+                    quad[0] = FloatPoint(x1, y1 + max(-adjacentWidth1, 0));
+                    quad[1] = FloatPoint(x1, y2 - max(-adjacentWidth2, 0));
+                    quad[2] = FloatPoint(x2, y2 - max(adjacentWidth2, 0));
+                    quad[3] = FloatPoint(x2, y1 + max(adjacentWidth1, 0));
+                    break;
+                case BSRight:
+                    quad[0] = FloatPoint(x1, y1 + max(adjacentWidth1, 0));
+                    quad[1] = FloatPoint(x1, y2 - max(adjacentWidth2, 0));
+                    quad[2] = FloatPoint(x2, y2 - max(-adjacentWidth2, 0));
+                    quad[3] = FloatPoint(x2, y1 + max(-adjacentWidth1, 0));
+                    break;
+            }
+
+            graphicsContext->drawConvexPolygon(4, quad, antialias);
+            graphicsContext->setStrokeStyle(oldStrokeStyle);
+            break;
+        }
+    }
+}
+
+#if !HAVE(PATH_BASED_BORDER_RADIUS_DRAWING)
+void RenderObject::drawArcForBoxSide(GraphicsContext* graphicsContext, int x, int y, float thickness, const IntSize& radius,
+                                     int angleStart, int angleSpan, BoxSide s, Color color,
+                                     EBorderStyle style, bool firstCorner)
+{
+    // FIXME: This function should be removed when all ports implement GraphicsContext::clipConvexPolygon()!!
+    // At that time, everyone can use RenderObject::drawBoxSideFromPath() instead. This should happen soon.
+    if ((style == DOUBLE && thickness / 2 < 3) || ((style == RIDGE || style == GROOVE) && thickness / 2 < 2))
+        style = SOLID;
+
+    switch (style) {
+        case BNONE:
+        case BHIDDEN:
+            return;
+        case DOTTED:
+        case DASHED:
+            graphicsContext->setStrokeColor(color, m_style->colorSpace());
+            graphicsContext->setStrokeStyle(style == DOTTED ? DottedStroke : DashedStroke);
+            graphicsContext->setStrokeThickness(thickness);
+            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
+            break;
+        case DOUBLE: {
+            float third = thickness / 3.0f;
+            float innerThird = (thickness + 1.0f) / 6.0f;
+            int shiftForInner = static_cast<int>(innerThird * 2.5f);
+
+            int outerY = y;
+            int outerHeight = radius.height() * 2;
+            int innerX = x + shiftForInner;
+            int innerY = y + shiftForInner;
+            int innerWidth = (radius.width() - shiftForInner) * 2;
+            int innerHeight = (radius.height() - shiftForInner) * 2;
+            if (innerThird > 1 && (s == BSTop || (firstCorner && (s == BSLeft || s == BSRight)))) {
+                outerHeight += 2;
+                innerHeight += 2;
+            }
+
+            graphicsContext->setStrokeStyle(SolidStroke);
+            graphicsContext->setStrokeColor(color, m_style->colorSpace());
+            graphicsContext->setStrokeThickness(third);
+            graphicsContext->strokeArc(IntRect(x, outerY, radius.width() * 2, outerHeight), angleStart, angleSpan);
+            graphicsContext->setStrokeThickness(innerThird > 2 ? innerThird - 1 : innerThird);
+            graphicsContext->strokeArc(IntRect(innerX, innerY, innerWidth, innerHeight), angleStart, angleSpan);
+            break;
+        }
+        case GROOVE:
+        case RIDGE: {
+            Color c2;
+            if ((style == RIDGE && (s == BSTop || s == BSLeft)) ||
+                    (style == GROOVE && (s == BSBottom || s == BSRight)))
+                c2 = color.dark();
+            else {
+                c2 = color;
+                color = color.dark();
+            }
+
+            graphicsContext->setStrokeStyle(SolidStroke);
+            graphicsContext->setStrokeColor(color, m_style->colorSpace());
+            graphicsContext->setStrokeThickness(thickness);
+            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
+
+            float halfThickness = (thickness + 1.0f) / 4.0f;
+            int shiftForInner = static_cast<int>(halfThickness * 1.5f);
+            graphicsContext->setStrokeColor(c2, m_style->colorSpace());
+            graphicsContext->setStrokeThickness(halfThickness > 2 ? halfThickness - 1 : halfThickness);
+            graphicsContext->strokeArc(IntRect(x + shiftForInner, y + shiftForInner, (radius.width() - shiftForInner) * 2,
+                                       (radius.height() - shiftForInner) * 2), angleStart, angleSpan);
+            break;
+        }
+        case INSET:
+            if (s == BSTop || s == BSLeft)
+                color = color.dark();
+        case OUTSET:
+            if (style == OUTSET && (s == BSBottom || s == BSRight))
+                color = color.dark();
+        case SOLID:
+            graphicsContext->setStrokeStyle(SolidStroke);
+            graphicsContext->setStrokeColor(color, m_style->colorSpace());
+            graphicsContext->setStrokeThickness(thickness);
+            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
+            break;
+    }
+}
+#endif
+    
+void RenderObject::paintFocusRing(GraphicsContext* context, const LayoutPoint& paintOffset, RenderStyle* style)
+{
+    Vector<LayoutRect> focusRingRects;
+    addFocusRingRects(focusRingRects, paintOffset);
+    if (style->outlineStyleIsAuto())
+        context->drawFocusRing(focusRingRects, style->outlineWidth(), style->outlineOffset(), style->visitedDependentColor(CSSPropertyOutlineColor));
+    else
+        addPDFURLRect(context, unionRect(focusRingRects));
+}        
+
+void RenderObject::addPDFURLRect(GraphicsContext* context, const LayoutRect& rect)
+{
+    if (rect.isEmpty())
+        return;
+    Node* n = node();
+    if (!n || !n->isLink() || !n->isElementNode())
+        return;
+    const AtomicString& href = static_cast<Element*>(n)->getAttribute(hrefAttr);
+    if (href.isNull())
+        return;
+    context->setURLForRect(n->document()->completeURL(href), rect);
+}
+
+void RenderObject::paintOutline(GraphicsContext* graphicsContext, const LayoutRect& paintRect)
+{
+    if (!hasOutline())
+        return;
+
+    RenderStyle* styleToUse = style();
+    LayoutUnit outlineWidth = styleToUse->outlineWidth();
+    EBorderStyle outlineStyle = styleToUse->outlineStyle();
+
+    Color outlineColor = styleToUse->visitedDependentColor(CSSPropertyOutlineColor);
+
+    LayoutUnit outlineOffset = styleToUse->outlineOffset();
+
+    if (styleToUse->outlineStyleIsAuto() || hasOutlineAnnotation()) {
+        if (!theme()->supportsFocusRing(styleToUse)) {
+            // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
+            paintFocusRing(graphicsContext, paintRect.location(), styleToUse);
+        }
+    }
+
+    if (styleToUse->outlineStyleIsAuto() || styleToUse->outlineStyle() == BNONE)
+        return;
+
+    LayoutRect inner = paintRect;
+    inner.inflate(outlineOffset);
+
+    LayoutRect outer = inner;
+    outer.inflate(outlineWidth);
+
+    // FIXME: This prevents outlines from painting inside the object. See bug 12042
+    if (outer.isEmpty())
+        return;
+
+    bool useTransparencyLayer = outlineColor.hasAlpha();
+    if (useTransparencyLayer) {
+        if (outlineStyle == SOLID) {
+            Path path;
+            path.addRect(outer);
+            path.addRect(inner);
+            graphicsContext->setFillRule(RULE_EVENODD);
+            graphicsContext->setFillColor(outlineColor, styleToUse->colorSpace());
+            graphicsContext->fillPath(path);
+            return;
+        }
+        graphicsContext->beginTransparencyLayer(static_cast<float>(outlineColor.alpha()) / 255);
+        outlineColor = Color(outlineColor.red(), outlineColor.green(), outlineColor.blue());
+    }
+
+    LayoutUnit leftOuter = outer.x();
+    LayoutUnit leftInner = inner.x();
+    LayoutUnit rightOuter = outer.maxX();
+    LayoutUnit rightInner = inner.maxX();
+    LayoutUnit topOuter = outer.y();
+    LayoutUnit topInner = inner.y();
+    LayoutUnit bottomOuter = outer.maxY();
+    LayoutUnit bottomInner = inner.maxY();
+    
+    drawLineForBoxSide(graphicsContext, leftOuter, topOuter, leftInner, bottomOuter, BSLeft, outlineColor, outlineStyle, outlineWidth, outlineWidth);
+    drawLineForBoxSide(graphicsContext, leftOuter, topOuter, rightOuter, topInner, BSTop, outlineColor, outlineStyle, outlineWidth, outlineWidth);
+    drawLineForBoxSide(graphicsContext, rightInner, topOuter, rightOuter, bottomOuter, BSRight, outlineColor, outlineStyle, outlineWidth, outlineWidth);
+    drawLineForBoxSide(graphicsContext, leftOuter, bottomInner, rightOuter, bottomOuter, BSBottom, outlineColor, outlineStyle, outlineWidth, outlineWidth);
+
+    if (useTransparencyLayer)
+        graphicsContext->endTransparencyLayer();
+}
+
+LayoutRect RenderObject::absoluteBoundingBoxRect(bool useTransforms) const
+{
+    if (useTransforms) {
+        Vector<FloatQuad> quads;
+        absoluteQuads(quads);
+
+        size_t n = quads.size();
+        if (!n)
+            return IntRect();
+    
+        LayoutRect result = quads[0].enclosingBoundingBox();
+        for (size_t i = 1; i < n; ++i)
+            result.unite(quads[i].enclosingBoundingBox());
+        return result;
+    }
+
+    FloatPoint absPos = localToAbsolute();
+    Vector<LayoutRect> rects;
+    absoluteRects(rects, flooredLayoutPoint(absPos));
+
+    size_t n = rects.size();
+    if (!n)
+        return LayoutRect();
+
+    LayoutRect result = rects[0];
+    for (size_t i = 1; i < n; ++i)
+        result.unite(rects[i]);
+    return result;
+}
+
+void RenderObject::absoluteFocusRingQuads(Vector<FloatQuad>& quads)
+{
+    Vector<LayoutRect> rects;
+    // FIXME: addFocusRingRects() needs to be passed this transform-unaware
+    // localToAbsolute() offset here because RenderInline::addFocusRingRects()
+    // implicitly assumes that. This doesn't work correctly with transformed
+    // descendants.
+    FloatPoint absolutePoint = localToAbsolute();
+    addFocusRingRects(rects, flooredLayoutPoint(absolutePoint));
+    size_t count = rects.size(); 
+    for (size_t i = 0; i < count; ++i) {
+        LayoutRect rect = rects[i];
+        rect.move(-absolutePoint.x(), -absolutePoint.y());
+        quads.append(localToAbsoluteQuad(FloatQuad(rect)));
+    }
+}
+
+void RenderObject::addAbsoluteRectForLayer(LayoutRect& result)
+{
+    if (hasLayer())
+        result.unite(absoluteBoundingBoxRectIgnoringTransforms());
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
+        current->addAbsoluteRectForLayer(result);
+}
+
+LayoutRect RenderObject::paintingRootRect(LayoutRect& topLevelRect)
+{
+    LayoutRect result = absoluteBoundingBoxRectIgnoringTransforms();
+    topLevelRect = result;
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
+        current->addAbsoluteRectForLayer(result);
+    return result;
+}
+
+void RenderObject::paint(PaintInfo&, const LayoutPoint&)
+{
+}
+
+RenderBoxModelObject* RenderObject::containerForRepaint() const
+{
+    RenderView* v = view();
+    if (!v)
+        return 0;
+    
+    RenderBoxModelObject* repaintContainer = 0;
+
+#if USE(ACCELERATED_COMPOSITING)
+    if (v->usesCompositing()) {
+        RenderLayer* compLayer = enclosingLayer()->enclosingCompositingLayer();
+        if (compLayer)
+            repaintContainer = compLayer->renderer();
+    }
+#endif
+
+    // If we have a flow thread, then we need to do individual repaints within the RenderRegions instead.
+    // Return the flow thread as a repaint container in order to create a chokepoint that allows us to change
+    // repainting to do individual region repaints.
+    // FIXME: Composited layers inside a flow thread will bypass this mechanism and will malfunction. It's not
+    // clear how to address this problem for composited descendants of a RenderFlowThread.
+    if (!repaintContainer && inRenderFlowThread())
+        repaintContainer = enclosingRenderFlowThread();
+    return repaintContainer;
+}
+
+void RenderObject::repaintUsingContainer(RenderBoxModelObject* repaintContainer, const LayoutRect& r, bool immediate)
+{
+    if (!repaintContainer) {
+        view()->repaintViewRectangle(r, immediate);
+        return;
+    }
+
+    if (repaintContainer->isRenderFlowThread()) {
+        toRenderFlowThread(repaintContainer)->repaintRectangleInRegions(r, immediate);
+        return;
+    }
+
+#if USE(ACCELERATED_COMPOSITING)
+    RenderView* v = view();
+    if (repaintContainer->isRenderView()) {
+        ASSERT(repaintContainer == v);
+        bool viewHasCompositedLayer = v->hasLayer() && v->layer()->isComposited();
+        if (!viewHasCompositedLayer || v->layer()->backing()->paintingGoesToWindow()) {
+            LayoutRect repaintRectangle = r;
+            if (viewHasCompositedLayer &&  v->layer()->transform())
+                repaintRectangle = v->layer()->transform()->mapRect(r);
+            v->repaintViewRectangle(repaintRectangle, immediate);
+            return;
+        }
+    }
+    
+    if (v->usesCompositing()) {
+        ASSERT(repaintContainer->hasLayer() && repaintContainer->layer()->isComposited());
+        repaintContainer->layer()->setBackingNeedsRepaintInRect(r);
+    }
+#else
+    if (repaintContainer->isRenderView())
+        toRenderView(repaintContainer)->repaintViewRectangle(r, immediate);
+#endif
+}
+
+void RenderObject::repaint(bool immediate)
+{
+    // Don't repaint if we're unrooted (note that view() still returns the view when unrooted)
+    RenderView* view;
+    if (!isRooted(&view))
+        return;
+
+    if (view->printing())
+        return; // Don't repaint if we're printing.
+
+    RenderBoxModelObject* repaintContainer = containerForRepaint();
+    repaintUsingContainer(repaintContainer ? repaintContainer : view, clippedOverflowRectForRepaint(repaintContainer), immediate);
+}
+
+void RenderObject::repaintRectangle(const LayoutRect& r, bool immediate)
+{
+    // Don't repaint if we're unrooted (note that view() still returns the view when unrooted)
+    RenderView* view;
+    if (!isRooted(&view))
+        return;
+
+    if (view->printing())
+        return; // Don't repaint if we're printing.
+
+    LayoutRect dirtyRect(r);
+
+    // FIXME: layoutDelta needs to be applied in parts before/after transforms and
+    // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
+    dirtyRect.move(view->layoutDelta());
+
+    RenderBoxModelObject* repaintContainer = containerForRepaint();
+    computeRectForRepaint(repaintContainer, dirtyRect);
+    repaintUsingContainer(repaintContainer ? repaintContainer : view, dirtyRect, immediate);
+}
+
+bool RenderObject::repaintAfterLayoutIfNeeded(RenderBoxModelObject* repaintContainer, const LayoutRect& oldBounds, const LayoutRect& oldOutlineBox, const LayoutRect* newBoundsPtr, const LayoutRect* newOutlineBoxRectPtr)
+{
+    RenderView* v = view();
+    if (v->printing())
+        return false; // Don't repaint if we're printing.
+
+    // This ASSERT fails due to animations.  See https://bugs.webkit.org/show_bug.cgi?id=37048
+    // ASSERT(!newBoundsPtr || *newBoundsPtr == clippedOverflowRectForRepaint(repaintContainer));
+    LayoutRect newBounds = newBoundsPtr ? *newBoundsPtr : clippedOverflowRectForRepaint(repaintContainer);
+    LayoutRect newOutlineBox;
+
+    bool fullRepaint = selfNeedsLayout();
+    // Presumably a background or a border exists if border-fit:lines was specified.
+    if (!fullRepaint && style()->borderFit() == BorderFitLines)
+        fullRepaint = true;
+    if (!fullRepaint) {
+        // This ASSERT fails due to animations.  See https://bugs.webkit.org/show_bug.cgi?id=37048
+        // ASSERT(!newOutlineBoxRectPtr || *newOutlineBoxRectPtr == outlineBoundsForRepaint(repaintContainer));
+        newOutlineBox = newOutlineBoxRectPtr ? *newOutlineBoxRectPtr : outlineBoundsForRepaint(repaintContainer);
+        if (newOutlineBox.location() != oldOutlineBox.location() || (mustRepaintBackgroundOrBorder() && (newBounds != oldBounds || newOutlineBox != oldOutlineBox)))
+            fullRepaint = true;
+    }
+
+    if (!repaintContainer)
+        repaintContainer = v;
+
+    if (fullRepaint) {
+        repaintUsingContainer(repaintContainer, oldBounds);
+        if (newBounds != oldBounds)
+            repaintUsingContainer(repaintContainer, newBounds);
+        return true;
+    }
+
+    if (newBounds == oldBounds && newOutlineBox == oldOutlineBox)
+        return false;
+
+    LayoutUnit deltaLeft = newBounds.x() - oldBounds.x();
+    if (deltaLeft > 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), oldBounds.y(), deltaLeft, oldBounds.height()));
+    else if (deltaLeft < 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), newBounds.y(), -deltaLeft, newBounds.height()));
+
+    LayoutUnit deltaRight = newBounds.maxX() - oldBounds.maxX();
+    if (deltaRight > 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.maxX(), newBounds.y(), deltaRight, newBounds.height()));
+    else if (deltaRight < 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(newBounds.maxX(), oldBounds.y(), -deltaRight, oldBounds.height()));
+
+    LayoutUnit deltaTop = newBounds.y() - oldBounds.y();
+    if (deltaTop > 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), oldBounds.y(), oldBounds.width(), deltaTop));
+    else if (deltaTop < 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), newBounds.y(), newBounds.width(), -deltaTop));
+
+    LayoutUnit deltaBottom = newBounds.maxY() - oldBounds.maxY();
+    if (deltaBottom > 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), oldBounds.maxY(), newBounds.width(), deltaBottom));
+    else if (deltaBottom < 0)
+        repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), newBounds.maxY(), oldBounds.width(), -deltaBottom));
+
+    if (newOutlineBox == oldOutlineBox)
+        return false;
+
+    // We didn't move, but we did change size.  Invalidate the delta, which will consist of possibly
+    // two rectangles (but typically only one).
+    RenderStyle* outlineStyle = outlineStyleForRepaint();
+    LayoutUnit ow = outlineStyle->outlineSize();
+    LayoutUnit width = abs(newOutlineBox.width() - oldOutlineBox.width());
+    if (width) {
+        LayoutUnit shadowLeft;
+        LayoutUnit shadowRight;
+        style()->getBoxShadowHorizontalExtent(shadowLeft, shadowRight);
+
+        LayoutUnit borderRight = isBox() ? toRenderBox(this)->borderRight() : LayoutUnit(0);
+        LayoutUnit boxWidth = isBox() ? toRenderBox(this)->width() : LayoutUnit(0);
+        LayoutUnit borderWidth = max<LayoutUnit>(-outlineStyle->outlineOffset(), max(borderRight, max<LayoutUnit>(style()->borderTopRightRadius().width().calcValue(boxWidth), style()->borderBottomRightRadius().width().calcValue(boxWidth)))) + max(ow, shadowRight);
+        LayoutRect rightRect(newOutlineBox.x() + min(newOutlineBox.width(), oldOutlineBox.width()) - borderWidth,
+            newOutlineBox.y(),
+            width + borderWidth,
+            max(newOutlineBox.height(), oldOutlineBox.height()));
+        LayoutUnit right = min(newBounds.maxX(), oldBounds.maxX());
+        if (rightRect.x() < right) {
+            rightRect.setWidth(min(rightRect.width(), right - rightRect.x()));
+            repaintUsingContainer(repaintContainer, rightRect);
+        }
+    }
+    LayoutUnit height = abs(newOutlineBox.height() - oldOutlineBox.height());
+    if (height) {
+        LayoutUnit shadowTop;
+        LayoutUnit shadowBottom;
+        style()->getBoxShadowVerticalExtent(shadowTop, shadowBottom);
+
+        LayoutUnit borderBottom = isBox() ? toRenderBox(this)->borderBottom() : LayoutUnit(0);
+        LayoutUnit boxHeight = isBox() ? toRenderBox(this)->height() : LayoutUnit(0);
+        LayoutUnit borderHeight = max<LayoutUnit>(-outlineStyle->outlineOffset(), max(borderBottom, max<LayoutUnit>(style()->borderBottomLeftRadius().height().calcValue(boxHeight), style()->borderBottomRightRadius().height().calcValue(boxHeight)))) + max(ow, shadowBottom);
+        LayoutRect bottomRect(newOutlineBox.x(),
+            min(newOutlineBox.maxY(), oldOutlineBox.maxY()) - borderHeight,
+            max(newOutlineBox.width(), oldOutlineBox.width()),
+            height + borderHeight);
+        LayoutUnit bottom = min(newBounds.maxY(), oldBounds.maxY());
+        if (bottomRect.y() < bottom) {
+            bottomRect.setHeight(min(bottomRect.height(), bottom - bottomRect.y()));
+            repaintUsingContainer(repaintContainer, bottomRect);
+        }
+    }
+    return false;
+}
+
+void RenderObject::repaintDuringLayoutIfMoved(const LayoutRect&)
+{
+}
+
+void RenderObject::repaintOverhangingFloats(bool)
+{
+}
+
+bool RenderObject::checkForRepaintDuringLayout() const
+{
+    // FIXME: <https://bugs.webkit.org/show_bug.cgi?id=20885> It is probably safe to also require
+    // m_everHadLayout. Currently, only RenderBlock::layoutBlock() adds this condition. See also
+    // <https://bugs.webkit.org/show_bug.cgi?id=15129>.
+    return !document()->view()->needsFullRepaint() && !hasLayer();
+}
+
+LayoutRect RenderObject::rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, LayoutUnit outlineWidth) const
+{
+    LayoutRect r(clippedOverflowRectForRepaint(repaintContainer));
+    r.inflate(outlineWidth);
+    return r;
+}
+
+LayoutRect RenderObject::clippedOverflowRectForRepaint(RenderBoxModelObject*) const
+{
+    ASSERT_NOT_REACHED();
+    return LayoutRect();
+}
+
+void RenderObject::computeRectForRepaint(RenderBoxModelObject* repaintContainer, LayoutRect& rect, bool fixed) const
+{
+    if (repaintContainer == this)
+        return;
+
+    if (RenderObject* o = parent()) {
+        if (o->isBlockFlow()) {
+            RenderBlock* cb = toRenderBlock(o);
+            if (cb->hasColumns())
+                cb->adjustRectForColumns(rect);
+        }
+
+        if (o->hasOverflowClip()) {
+            // o->height() is inaccurate if we're in the middle of a layout of |o|, so use the
+            // layer's size instead.  Even if the layer's size is wrong, the layer itself will repaint
+            // anyway if its size does change.
+            RenderBox* boxParent = toRenderBox(o);
+
+            LayoutRect repaintRect(rect);
+            repaintRect.move(-boxParent->layer()->scrolledContentOffset()); // For overflow:auto/scroll/hidden.
+
+            LayoutRect boxRect(LayoutPoint(), boxParent->layer()->size());
+            rect = intersection(repaintRect, boxRect);
+            if (rect.isEmpty())
+                return;
+        }
+
+        o->computeRectForRepaint(repaintContainer, rect, fixed);
+    }
+}
+
+void RenderObject::computeFloatRectForRepaint(RenderBoxModelObject*, FloatRect&, bool) const
+{
+    ASSERT_NOT_REACHED();
+}
+
+void RenderObject::dirtyLinesFromChangedChild(RenderObject*)
+{
+}
+
+#ifndef NDEBUG
+
+void RenderObject::showTreeForThis() const
+{
+    if (node())
+        node()->showTreeForThis();
+}
+
+void RenderObject::showRenderTreeForThis() const
+{
+    showRenderTree(this, 0);
+}
+
+void RenderObject::showLineTreeForThis() const
+{
+    if (containingBlock())
+        containingBlock()->showLineTreeAndMark(0, 0, 0, 0, this);
+}
+
+void RenderObject::showRenderObject() const
+{
+    showRenderObject(0);
+}
+
+void RenderObject::showRenderObject(int printedCharacters) const
+{
+    // As this function is intended to be used when debugging, the
+    // this pointer may be 0.
+    if (!this) {
+        fputs("(null)\n", stderr);
+        return;
+    }
+
+    printedCharacters += fprintf(stderr, "%s %p", renderName(), this);
+
+    if (node()) {
+        if (printedCharacters)
+            for (; printedCharacters < showTreeCharacterOffset; printedCharacters++)
+                fputc(' ', stderr);
+        fputc('\t', stderr);
+        node()->showNode();
+    } else
+        fputc('\n', stderr);
+}
+
+void RenderObject::showRenderTreeAndMark(const RenderObject* markedObject1, const char* markedLabel1, const RenderObject* markedObject2, const char* markedLabel2, int depth) const
+{
+    int printedCharacters = 0;
+    if (markedObject1 == this && markedLabel1)
+        printedCharacters += fprintf(stderr, "%s", markedLabel1);
+    if (markedObject2 == this && markedLabel2)
+        printedCharacters += fprintf(stderr, "%s", markedLabel2);
+    for (; printedCharacters < depth * 2; printedCharacters++)
+        fputc(' ', stderr);
+
+    showRenderObject(printedCharacters);
+    if (!this)
+        return;
+
+    for (const RenderObject* child = firstChild(); child; child = child->nextSibling())
+        child->showRenderTreeAndMark(markedObject1, markedLabel1, markedObject2, markedLabel2, depth + 1);
+}
+
+#endif // NDEBUG
+
+Color RenderObject::selectionBackgroundColor() const
+{
+    Color color;
+    if (style()->userSelect() != SELECT_NONE) {
+        RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(SELECTION);
+        if (pseudoStyle && pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).isValid())
+            color = pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).blendWithWhite();
+        else
+            color = frame()->selection()->isFocusedAndActive() ?
+                    theme()->activeSelectionBackgroundColor() :
+                    theme()->inactiveSelectionBackgroundColor();
+    }
+
+    return color;
+}
+
+Color RenderObject::selectionColor(int colorProperty) const
+{
+    Color color;
+    // If the element is unselectable, or we are only painting the selection,
+    // don't override the foreground color with the selection foreground color.
+    if (style()->userSelect() == SELECT_NONE
+        || (frame()->view()->paintBehavior() & PaintBehaviorSelectionOnly))
+        return color;
+
+    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(SELECTION)) {
+        color = pseudoStyle->visitedDependentColor(colorProperty);
+        if (!color.isValid())
+            color = pseudoStyle->visitedDependentColor(CSSPropertyColor);
+    } else
+        color = frame()->selection()->isFocusedAndActive() ?
+                theme()->activeSelectionForegroundColor() :
+                theme()->inactiveSelectionForegroundColor();
+
+    return color;
+}
+
+Color RenderObject::selectionForegroundColor() const
+{
+    return selectionColor(CSSPropertyWebkitTextFillColor);
+}
+
+Color RenderObject::selectionEmphasisMarkColor() const
+{
+    return selectionColor(CSSPropertyWebkitTextEmphasisColor);
+}
+
+void RenderObject::selectionStartEnd(int& spos, int& epos) const
+{
+    view()->selectionStartEnd(spos, epos);
+}
+
+void RenderObject::handleDynamicFloatPositionChange()
+{
+    // We have gone from not affecting the inline status of the parent flow to suddenly
+    // having an impact.  See if there is a mismatch between the parent flow's
+    // childrenInline() state and our state.
+    setInline(style()->isDisplayInlineType());
+    if (isInline() != parent()->childrenInline()) {
+        if (!isInline())
+            toRenderBoxModelObject(parent())->childBecameNonInline(this);
+        else {
+            // An anonymous block must be made to wrap this inline.
+            RenderBlock* block = toRenderBlock(parent())->createAnonymousBlock();
+            RenderObjectChildList* childlist = parent()->virtualChildren();
+            childlist->insertChildNode(parent(), block, this);
+            block->children()->appendChildNode(block, childlist->removeChildNode(parent(), this));
+        }
+    }
+}
+
+void RenderObject::setAnimatableStyle(PassRefPtr<RenderStyle> style)
+{
+    if (!isText() && style)
+        setStyle(animation()->updateAnimations(this, style.get()));
+    else
+        setStyle(style);
+}
+
+StyleDifference RenderObject::adjustStyleDifference(StyleDifference diff, unsigned contextSensitiveProperties) const
+{
+#if USE(ACCELERATED_COMPOSITING)
+    // If transform changed, and we are not composited, need to do a layout.
+    if (contextSensitiveProperties & ContextSensitivePropertyTransform) {
+        // Text nodes share style with their parents but transforms don't apply to them,
+        // hence the !isText() check.
+        // FIXME: when transforms are taken into account for overflow, we will need to do a layout.
+        if (!isText() && (!hasLayer() || !toRenderBoxModelObject(this)->layer()->isComposited())) {
+            // We need to set at least SimplifiedLayout, but if PositionedMovementOnly is already set
+            // then we actually need SimplifiedLayoutAndPositionedMovement.
+            if (!hasLayer())
+                diff = StyleDifferenceLayout; // FIXME: Do this for now since SimplifiedLayout cannot handle updating floating objects lists.
+            else if (diff < StyleDifferenceLayoutPositionedMovementOnly)
+                diff = StyleDifferenceSimplifiedLayout;
+            else if (diff < StyleDifferenceSimplifiedLayout)
+                diff = StyleDifferenceSimplifiedLayoutAndPositionedMovement;
+        } else if (diff < StyleDifferenceRecompositeLayer)
+            diff = StyleDifferenceRecompositeLayer;
+    }
+
+    // If opacity changed, and we are not composited, need to repaint (also
+    // ignoring text nodes)
+    if (contextSensitiveProperties & ContextSensitivePropertyOpacity) {
+        if (!isText() && (!hasLayer() || !toRenderBoxModelObject(this)->layer()->isComposited()))
+            diff = StyleDifferenceRepaintLayer;
+        else if (diff < StyleDifferenceRecompositeLayer)
+            diff = StyleDifferenceRecompositeLayer;
+    }
+    
+    // The answer to requiresLayer() for plugins and iframes can change outside of the style system,
+    // since it depends on whether we decide to composite these elements. When the layer status of
+    // one of these elements changes, we need to force a layout.
+    if (diff == StyleDifferenceEqual && style() && isBoxModelObject()) {
+        if (hasLayer() != toRenderBoxModelObject(this)->requiresLayer())
+            diff = StyleDifferenceLayout;
+    }
+#else
+    UNUSED_PARAM(contextSensitiveProperties);
+#endif
+
+    // If we have no layer(), just treat a RepaintLayer hint as a normal Repaint.
+    if (diff == StyleDifferenceRepaintLayer && !hasLayer())
+        diff = StyleDifferenceRepaint;
+
+    return diff;
+}
+
+void RenderObject::setStyle(PassRefPtr<RenderStyle> style)
+{
+    if (m_style == style) {
+#if USE(ACCELERATED_COMPOSITING)
+        // We need to run through adjustStyleDifference() for iframes and plugins, so
+        // style sharing is disabled for them. That should ensure that we never hit this code path.
+        ASSERT(!isRenderIFrame() && !isEmbeddedObject() &&!isApplet());
+#endif
+        return;
+    }
+
+    StyleDifference diff = StyleDifferenceEqual;
+    unsigned contextSensitiveProperties = ContextSensitivePropertyNone;
+    if (m_style)
+        diff = m_style->diff(style.get(), contextSensitiveProperties);
+
+    diff = adjustStyleDifference(diff, contextSensitiveProperties);
+
+    styleWillChange(diff, style.get());
+    
+    RefPtr<RenderStyle> oldStyle = m_style.release();
+    m_style = style;
+
+    updateFillImages(oldStyle ? oldStyle->backgroundLayers() : 0, m_style ? m_style->backgroundLayers() : 0);
+    updateFillImages(oldStyle ? oldStyle->maskLayers() : 0, m_style ? m_style->maskLayers() : 0);
+
+    updateImage(oldStyle ? oldStyle->borderImage().image() : 0, m_style ? m_style->borderImage().image() : 0);
+    updateImage(oldStyle ? oldStyle->maskBoxImage().image() : 0, m_style ? m_style->maskBoxImage().image() : 0);
+
+    // We need to ensure that view->maximalOutlineSize() is valid for any repaints that happen
+    // during styleDidChange (it's used by clippedOverflowRectForRepaint()).
+    if (m_style->outlineWidth() > 0 && m_style->outlineSize() > maximalOutlineSize(PaintPhaseOutline))
+        toRenderView(document()->renderer())->setMaximalOutlineSize(m_style->outlineSize());
+
+    styleDidChange(diff, oldStyle.get());
+
+    if (!m_parent || isText())
+        return;
+
+    // Now that the layer (if any) has been updated, we need to adjust the diff again,
+    // check whether we should layout now, and decide if we need to repaint.
+    StyleDifference updatedDiff = adjustStyleDifference(diff, contextSensitiveProperties);
+    
+    if (diff <= StyleDifferenceLayoutPositionedMovementOnly) {
+        if (updatedDiff == StyleDifferenceLayout)
+            setNeedsLayoutAndPrefWidthsRecalc();
+        else if (updatedDiff == StyleDifferenceLayoutPositionedMovementOnly)
+            setNeedsPositionedMovementLayout();
+        else if (updatedDiff == StyleDifferenceSimplifiedLayoutAndPositionedMovement) {
+            setNeedsPositionedMovementLayout();
+            setNeedsSimplifiedNormalFlowLayout();
+        } else if (updatedDiff == StyleDifferenceSimplifiedLayout)
+            setNeedsSimplifiedNormalFlowLayout();
+    }
+    
+    if (updatedDiff == StyleDifferenceRepaintLayer || updatedDiff == StyleDifferenceRepaint) {
+        // Do a repaint with the new style now, e.g., for example if we go from
+        // not having an outline to having an outline.
+        repaint();
+    }
+}
+
+void RenderObject::setStyleInternal(PassRefPtr<RenderStyle> style)
+{
+    m_style = style;
+}
+
+void RenderObject::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+{
+    if (m_style) {
+        // If our z-index changes value or our visibility changes,
+        // we need to dirty our stacking context's z-order list.
+        if (newStyle) {
+            bool visibilityChanged = m_style->visibility() != newStyle->visibility() 
+                || m_style->zIndex() != newStyle->zIndex() 
+                || m_style->hasAutoZIndex() != newStyle->hasAutoZIndex();
+#if ENABLE(DASHBOARD_SUPPORT)
+            if (visibilityChanged)
+                document()->setDashboardRegionsDirty(true);
+#endif
+            if (visibilityChanged && AXObjectCache::accessibilityEnabled())
+                document()->axObjectCache()->childrenChanged(this);
+
+            // Keep layer hierarchy visibility bits up to date if visibility changes.
+            if (m_style->visibility() != newStyle->visibility()) {
+                if (RenderLayer* l = enclosingLayer()) {
+                    if (newStyle->visibility() == VISIBLE)
+                        l->setHasVisibleContent(true);
+                    else if (l->hasVisibleContent() && (this == l->renderer() || l->renderer()->style()->visibility() != VISIBLE)) {
+                        l->dirtyVisibleContentStatus();
+                        if (diff > StyleDifferenceRepaintLayer)
+                            repaint();
+                    }
+                }
+            }
+        }
+
+        if (m_parent && (diff == StyleDifferenceRepaint || newStyle->outlineSize() < m_style->outlineSize()))
+            repaint();
+        if (isFloating() && (m_style->floating() != newStyle->floating()))
+            // For changes in float styles, we need to conceivably remove ourselves
+            // from the floating objects list.
+            toRenderBox(this)->removeFloatingOrPositionedChildFromBlockLists();
+        else if (isPositioned() && (m_style->position() != newStyle->position()))
+            // For changes in positioning styles, we need to conceivably remove ourselves
+            // from the positioned objects list.
+            toRenderBox(this)->removeFloatingOrPositionedChildFromBlockLists();
+
+        s_affectsParentBlock = isFloatingOrPositioned() &&
+            (!newStyle->isFloating() && newStyle->position() != AbsolutePosition && newStyle->position() != FixedPosition)
+            && parent() && (parent()->isBlockFlow() || parent()->isRenderInline());
+
+        // reset style flags
+        if (diff == StyleDifferenceLayout || diff == StyleDifferenceLayoutPositionedMovementOnly) {
+            setFloating(false);
+            setPositioned(false);
+            setRelPositioned(false);
+        }
+        setHorizontalWritingMode(true);
+        setPaintBackground(false);
+        setHasOverflowClip(false);
+        setHasTransform(false);
+        setHasReflection(false);
+    } else
+        s_affectsParentBlock = false;
+
+    if (view()->frameView()) {
+        bool shouldBlitOnFixedBackgroundImage = false;
+#if ENABLE(FAST_MOBILE_SCROLLING)
+        // On low-powered/mobile devices, preventing blitting on a scroll can cause noticeable delays
+        // when scrolling a page with a fixed background image. As an optimization, assuming there are
+        // no fixed positoned elements on the page, we can acclerate scrolling (via blitting) if we
+        // ignore the CSS property "background-attachment: fixed".
+        shouldBlitOnFixedBackgroundImage = true;
+#endif
+
+        bool newStyleSlowScroll = newStyle && !shouldBlitOnFixedBackgroundImage && newStyle->hasFixedBackgroundImage();
+        bool oldStyleSlowScroll = m_style && !shouldBlitOnFixedBackgroundImage && m_style->hasFixedBackgroundImage();
+        if (oldStyleSlowScroll != newStyleSlowScroll) {
+            if (oldStyleSlowScroll)
+                view()->frameView()->removeSlowRepaintObject();
+            if (newStyleSlowScroll)
+                view()->frameView()->addSlowRepaintObject();
+        }
+    }
+}
+
+static bool areNonIdenticalCursorListsEqual(const RenderStyle* a, const RenderStyle* b)
+{
+    ASSERT(a->cursors() != b->cursors());
+    return a->cursors() && b->cursors() && *a->cursors() == *b->cursors();
+}
+
+static inline bool areCursorsEqual(const RenderStyle* a, const RenderStyle* b)
+{
+    return a->cursor() == b->cursor() && (a->cursors() == b->cursors() || areNonIdenticalCursorListsEqual(a, b));
+}
+
+void RenderObject::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+{
+    if (s_affectsParentBlock)
+        handleDynamicFloatPositionChange();
+
+    if (!m_parent)
+        return;
+    
+    if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) {
+        RenderCounter::rendererStyleChanged(this, oldStyle, m_style.get());
+
+        // If the object already needs layout, then setNeedsLayout won't do
+        // any work. But if the containing block has changed, then we may need
+        // to mark the new containing blocks for layout. The change that can
+        // directly affect the containing block of this object is a change to
+        // the position style.
+        if (needsLayout() && oldStyle->position() != m_style->position())
+            markContainingBlocksForLayout();
+
+        if (diff == StyleDifferenceLayout)
+            setNeedsLayoutAndPrefWidthsRecalc();
+        else
+            setNeedsSimplifiedNormalFlowLayout();
+    } else if (diff == StyleDifferenceSimplifiedLayoutAndPositionedMovement) {
+        setNeedsPositionedMovementLayout();
+        setNeedsSimplifiedNormalFlowLayout();
+    } else if (diff == StyleDifferenceLayoutPositionedMovementOnly)
+        setNeedsPositionedMovementLayout();
+
+    // Don't check for repaint here; we need to wait until the layer has been
+    // updated by subclasses before we know if we have to repaint (in setStyle()).
+
+    if (oldStyle && !areCursorsEqual(oldStyle, style())) {
+        if (Frame* frame = this->frame())
+            frame->eventHandler()->dispatchFakeMouseMoveEventSoon();
+    }
+}
+
+void RenderObject::propagateStyleToAnonymousChildren(bool blockChildrenOnly)
+{
+    // FIXME: We could save this call when the change only affected non-inherited properties.
+    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
+        if (!child->isAnonymous() || child->style()->styleType() != NOPSEUDO)
+            continue;
+
+        if (blockChildrenOnly && !child->isRenderBlock())
+            continue;
+
+#if ENABLE(FULLSCREEN_API)
+        if (child->isRenderFullScreen() || child->isRenderFullScreenPlaceholder())
+            continue;
+#endif
+
+        RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyle(style());
+        if (style()->specifiesColumns()) {
+            if (child->style()->specifiesColumns())
+                newStyle->inheritColumnPropertiesFrom(style());
+            if (child->style()->columnSpan())
+                newStyle->setColumnSpan(ColumnSpanAll);
+        }
+        newStyle->setDisplay(child->style()->display());
+        child->setStyle(newStyle.release());
+    }
+}
+
+void RenderObject::updateFillImages(const FillLayer* oldLayers, const FillLayer* newLayers)
+{
+    // Optimize the common case
+    if (oldLayers && !oldLayers->next() && newLayers && !newLayers->next() && (oldLayers->image() == newLayers->image()))
+        return;
+    
+    // Go through the new layers and addClients first, to avoid removing all clients of an image.
+    for (const FillLayer* currNew = newLayers; currNew; currNew = currNew->next()) {
+        if (currNew->image())
+            currNew->image()->addClient(this);
+    }
+
+    for (const FillLayer* currOld = oldLayers; currOld; currOld = currOld->next()) {
+        if (currOld->image())
+            currOld->image()->removeClient(this);
+    }
+}
+
+void RenderObject::updateImage(StyleImage* oldImage, StyleImage* newImage)
+{
+    if (oldImage != newImage) {
+        if (oldImage)
+            oldImage->removeClient(this);
+        if (newImage)
+            newImage->addClient(this);
+    }
+}
+
+LayoutRect RenderObject::viewRect() const
+{
+    return view()->viewRect();
+}
+
+FloatPoint RenderObject::localToAbsolute(const FloatPoint& localPoint, bool fixed, bool useTransforms) const
+{
+    TransformState transformState(TransformState::ApplyTransformDirection, localPoint);
+    mapLocalToContainer(0, fixed, useTransforms, transformState);
+    transformState.flatten();
+    
+    return transformState.lastPlanarPoint();
+}
+
+FloatPoint RenderObject::absoluteToLocal(const FloatPoint& containerPoint, bool fixed, bool useTransforms) const
+{
+    TransformState transformState(TransformState::UnapplyInverseTransformDirection, containerPoint);
+    mapAbsoluteToLocalPoint(fixed, useTransforms, transformState);
+    transformState.flatten();
+    
+    return transformState.lastPlanarPoint();
+}
+
+void RenderObject::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState& transformState, bool* wasFixed) const
+{
+    if (repaintContainer == this)
+        return;
+
+    RenderObject* o = parent();
+    if (!o)
+        return;
+
+    LayoutPoint centerPoint = roundedLayoutPoint(transformState.mappedPoint());
+    if (o->isBox() && o->style()->isFlippedBlocksWritingMode())
+        transformState.move(toRenderBox(o)->flipForWritingModeIncludingColumns(roundedLayoutPoint(transformState.mappedPoint())) - centerPoint);
+
+    LayoutSize columnOffset;
+    o->adjustForColumns(columnOffset, roundedLayoutPoint(transformState.mappedPoint()));
+    if (!columnOffset.isZero())
+        transformState.move(columnOffset);
+
+    if (o->hasOverflowClip())
+        transformState.move(-toRenderBox(o)->layer()->scrolledContentOffset());
+
+    o->mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState, wasFixed);
+}
+
+void RenderObject::mapAbsoluteToLocalPoint(bool fixed, bool useTransforms, TransformState& transformState) const
+{
+    RenderObject* o = parent();
+    if (o) {
+        o->mapAbsoluteToLocalPoint(fixed, useTransforms, transformState);
+        if (o->hasOverflowClip())
+            transformState.move(toRenderBox(o)->layer()->scrolledContentOffset());
+    }
+}
+
+bool RenderObject::shouldUseTransformFromContainer(const RenderObject* containerObject) const
+{
+#if ENABLE(3D_RENDERING)
+    // hasTransform() indicates whether the object has transform, transform-style or perspective. We just care about transform,
+    // so check the layer's transform directly.
+    return (hasLayer() && toRenderBoxModelObject(this)->layer()->transform()) || (containerObject && containerObject->style()->hasPerspective());
+#else
+    UNUSED_PARAM(containerObject);
+    return hasTransform();
+#endif
+}
+
+void RenderObject::getTransformFromContainer(const RenderObject* containerObject, const LayoutSize& offsetInContainer, TransformationMatrix& transform) const
+{
+    transform.makeIdentity();
+    transform.translate(offsetInContainer.width(), offsetInContainer.height());
+    RenderLayer* layer;
+    if (hasLayer() && (layer = toRenderBoxModelObject(this)->layer()) && layer->transform())
+        transform.multiply(layer->currentTransform());
+    
+#if ENABLE(3D_RENDERING)
+    if (containerObject && containerObject->hasLayer() && containerObject->style()->hasPerspective()) {
+        // Perpsective on the container affects us, so we have to factor it in here.
+        ASSERT(containerObject->hasLayer());
+        FloatPoint perspectiveOrigin = toRenderBoxModelObject(containerObject)->layer()->perspectiveOrigin();
+
+        TransformationMatrix perspectiveMatrix;
+        perspectiveMatrix.applyPerspective(containerObject->style()->perspective());
+        
+        transform.translateRight3d(-perspectiveOrigin.x(), -perspectiveOrigin.y(), 0);
+        transform = perspectiveMatrix * transform;
+        transform.translateRight3d(perspectiveOrigin.x(), perspectiveOrigin.y(), 0);
+    }
+#else
+    UNUSED_PARAM(containerObject);
+#endif
+}
+
+FloatQuad RenderObject::localToContainerQuad(const FloatQuad& localQuad, RenderBoxModelObject* repaintContainer, bool fixed, bool* wasFixed) const
+{
+    // Track the point at the center of the quad's bounding box. As mapLocalToContainer() calls offsetFromContainer(),
+    // it will use that point as the reference point to decide which column's transform to apply in multiple-column blocks.
+    TransformState transformState(TransformState::ApplyTransformDirection, localQuad.boundingBox().center(), localQuad);
+    mapLocalToContainer(repaintContainer, fixed, true, transformState, wasFixed);
+    transformState.flatten();
+    
+    return transformState.lastPlanarQuad();
+}
+
+LayoutSize RenderObject::offsetFromContainer(RenderObject* o, const LayoutPoint& point) const
+{
+    ASSERT(o == container());
+
+    LayoutSize offset;
+
+    o->adjustForColumns(offset, point);
+
+    if (o->hasOverflowClip())
+        offset -= toRenderBox(o)->layer()->scrolledContentOffset();
+
+    return offset;
+}
+
+LayoutSize RenderObject::offsetFromAncestorContainer(RenderObject* container) const
+{
+    LayoutSize offset;
+    LayoutPoint referencePoint;
+    const RenderObject* currContainer = this;
+    do {
+        RenderObject* nextContainer = currContainer->container();
+        ASSERT(nextContainer);  // This means we reached the top without finding container.
+        if (!nextContainer)
+            break;
+        ASSERT(!currContainer->hasTransform());
+        LayoutSize currentOffset = currContainer->offsetFromContainer(nextContainer, referencePoint);
+        offset += currentOffset;
+        referencePoint.move(currentOffset);
+        currContainer = nextContainer;
+    } while (currContainer != container);
+
+    return offset;
+}
+
+LayoutRect RenderObject::localCaretRect(InlineBox*, int, LayoutUnit* extraWidthToEndOfLine)
+{
+    if (extraWidthToEndOfLine)
+        *extraWidthToEndOfLine = 0;
+
+    return LayoutRect();
+}
+
+bool RenderObject::isRooted(RenderView** view)
+{
+    RenderObject* o = this;
+    while (o->parent())
+        o = o->parent();
+
+    if (!o->isRenderView())
+        return false;
+
+    if (view)
+        *view = toRenderView(o);
+
+    return true;
+}
+
+bool RenderObject::hasOutlineAnnotation() const
+{
+    return node() && node()->isLink() && document()->printing();
+}
+
+RenderObject* RenderObject::container(RenderBoxModelObject* repaintContainer, bool* repaintContainerSkipped) const
+{
+    if (repaintContainerSkipped)
+        *repaintContainerSkipped = false;
+
+    // This method is extremely similar to containingBlock(), but with a few notable
+    // exceptions.
+    // (1) It can be used on orphaned subtrees, i.e., it can be called safely even when
+    // the object is not part of the primary document subtree yet.
+    // (2) For normal flow elements, it just returns the parent.
+    // (3) For absolute positioned elements, it will return a relative positioned inline.
+    // containingBlock() simply skips relpositioned inlines and lets an enclosing block handle
+    // the layout of the positioned object.  This does mean that computePositionedLogicalWidth and
+    // computePositionedLogicalHeight have to use container().
+    RenderObject* o = parent();
+
+    if (isText())
+        return o;
+
+    EPosition pos = m_style->position();
+    if (pos == FixedPosition) {
+        // container() can be called on an object that is not in the
+        // tree yet.  We don't call view() since it will assert if it
+        // can't get back to the canvas.  Instead we just walk as high up
+        // as we can.  If we're in the tree, we'll get the root.  If we
+        // aren't we'll get the root of our little subtree (most likely
+        // we'll just return 0).
+        // FIXME: The definition of view() has changed to not crawl up the render tree.  It might
+        // be safe now to use it.
+        while (o && o->parent() && !(o->hasTransform() && o->isRenderBlock())) {
+            if (repaintContainerSkipped && o == repaintContainer)
+                *repaintContainerSkipped = true;
+            o = o->parent();
+        }
+    } else if (pos == AbsolutePosition) {
+        // Same goes here.  We technically just want our containing block, but
+        // we may not have one if we're part of an uninstalled subtree.  We'll
+        // climb as high as we can though.
+        while (o && o->style()->position() == StaticPosition && !o->isRenderView() && !(o->hasTransform() && o->isRenderBlock())) {
+            if (repaintContainerSkipped && o == repaintContainer)
+                *repaintContainerSkipped = true;
+#if ENABLE(SVG)
+            if (o->isSVGForeignObject()) // foreignObject is the containing block for contents inside it
+                break;
+#endif
+            o = o->parent();
+        }
+    }
+
+    return o;
+}
+
+bool RenderObject::isSelectionBorder() const
+{
+    SelectionState st = selectionState();
+    return st == SelectionStart || st == SelectionEnd || st == SelectionBoth;
+}
+
+void RenderObject::willBeDestroyed()
+{
+    // Destroy any leftover anonymous children.
+    RenderObjectChildList* children = virtualChildren();
+    if (children)
+        children->destroyLeftoverChildren();
+
+    // If this renderer is being autoscrolled, stop the autoscroll timer
+    
+    // FIXME: RenderObject::destroy should not get called with a renderer whose document
+    // has a null frame, so we assert this. However, we don't want release builds to crash which is why we
+    // check that the frame is not null.
+    ASSERT(frame());
+    if (frame() && frame()->eventHandler()->autoscrollRenderer() == this)
+        frame()->eventHandler()->stopAutoscrollTimer(true);
+
+    if (AXObjectCache::accessibilityEnabled()) {
+        document()->axObjectCache()->childrenChanged(this->parent());
+        document()->axObjectCache()->remove(this);
+    }
+    animation()->cancelAnimations(this);
+
+    remove();
+
+    // If this renderer had a parent, remove should have destroyed any counters
+    // attached to this renderer and marked the affected other counters for
+    // reevaluation. This apparently redundant check is here for the case when
+    // this renderer had no parent at the time remove() was called.
+
+    if (hasCounterNodeMap())
+        RenderCounter::destroyCounterNodes(this);
+
+    // FIXME: Would like to do this in RenderBoxModelObject, but the timing is so complicated that this can't easily
+    // be moved into RenderBoxModelObject::destroy.
+    if (hasLayer()) {
+        setHasLayer(false);
+        toRenderBoxModelObject(this)->destroyLayer();
+    }
+}
+
+void RenderObject::destroy()
+{
+    willBeDestroyed();
+    arenaDelete(renderArena(), this);
+}
+
+void RenderObject::arenaDelete(RenderArena* arena, void* base)
+{
+    if (m_style) {
+        for (const FillLayer* bgLayer = m_style->backgroundLayers(); bgLayer; bgLayer = bgLayer->next()) {
+            if (StyleImage* backgroundImage = bgLayer->image())
+                backgroundImage->removeClient(this);
+        }
+
+        for (const FillLayer* maskLayer = m_style->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
+            if (StyleImage* maskImage = maskLayer->image())
+                maskImage->removeClient(this);
+        }
+
+        if (StyleImage* borderImage = m_style->borderImage().image())
+            borderImage->removeClient(this);
+
+        if (StyleImage* maskBoxImage = m_style->maskBoxImage().image())
+            maskBoxImage->removeClient(this);
+    }
+
+#ifndef NDEBUG
+    void* savedBase = baseOfRenderObjectBeingDeleted;
+    baseOfRenderObjectBeingDeleted = base;
+#endif
+    delete this;
+#ifndef NDEBUG
+    baseOfRenderObjectBeingDeleted = savedBase;
+#endif
+
+    // Recover the size left there for us by operator delete and free the memory.
+    arena->free(*(size_t*)base, base);
+}
+
+VisiblePosition RenderObject::positionForPoint(const LayoutPoint&)
+{
+    return createVisiblePosition(caretMinOffset(), DOWNSTREAM);
+}
+
+void RenderObject::updateDragState(bool dragOn)
+{
+    bool valueChanged = (dragOn != isDragging());
+    setIsDragging(dragOn);
+    if (valueChanged && style()->affectedByDragRules() && node())
+        node()->setNeedsStyleRecalc();
+    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
+        curr->updateDragState(dragOn);
+}
+
+bool RenderObject::hitTest(const HitTestRequest& request, HitTestResult& result, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter hitTestFilter)
+{
+    bool inside = false;
+    if (hitTestFilter != HitTestSelf) {
+        // First test the foreground layer (lines and inlines).
+        inside = nodeAtPoint(request, result, pointInContainer, accumulatedOffset, HitTestForeground);
+
+        // Test floats next.
+        if (!inside)
+            inside = nodeAtPoint(request, result, pointInContainer, accumulatedOffset, HitTestFloat);
+
+        // Finally test to see if the mouse is in the background (within a child block's background).
+        if (!inside)
+            inside = nodeAtPoint(request, result, pointInContainer, accumulatedOffset, HitTestChildBlockBackgrounds);
+    }
+
+    // See if the mouse is inside us but not any of our descendants
+    if (hitTestFilter != HitTestDescendants && !inside)
+        inside = nodeAtPoint(request, result, pointInContainer, accumulatedOffset, HitTestBlockBackground);
+
+    return inside;
+}
+
+void RenderObject::updateHitTestResult(HitTestResult& result, const LayoutPoint& point)
+{
+    if (result.innerNode())
+        return;
+
+    Node* n = node();
+    if (n) {
+        result.setInnerNode(n);
+        if (!result.innerNonSharedNode())
+            result.setInnerNonSharedNode(n);
+        result.setLocalPoint(point);
+    }
+}
+
+bool RenderObject::nodeAtPoint(const HitTestRequest&, HitTestResult&, const LayoutPoint& /*pointInContainer*/, const LayoutPoint& /*accumulatedOffset*/, HitTestAction)
+{
+    return false;
+}
+
+void RenderObject::scheduleRelayout()
+{
+    if (isRenderView()) {
+        FrameView* view = toRenderView(this)->frameView();
+        if (view)
+            view->scheduleRelayout();
+    } else {
+        if (isRooted()) {
+            if (RenderView* renderView = view()) {
+                if (FrameView* frameView = renderView->frameView())
+                    frameView->scheduleRelayoutOfSubtree(this);
+            }
+        }
+    }
+}
+
+void RenderObject::layout()
+{
+    ASSERT(needsLayout());
+    RenderObject* child = firstChild();
+    while (child) {
+        child->layoutIfNeeded();
+        ASSERT(!child->needsLayout());
+        child = child->nextSibling();
+    }
+    setNeedsLayout(false);
+}
+
+PassRefPtr<RenderStyle> RenderObject::uncachedFirstLineStyle(RenderStyle* style) const
+{
+    if (!document()->usesFirstLineRules())
+        return 0;
+
+    ASSERT(!isText());
+
+    RefPtr<RenderStyle> result;
+
+    if (isBlockFlow()) {
+        if (RenderBlock* firstLineBlock = this->firstLineBlock())
+            result = firstLineBlock->getUncachedPseudoStyle(FIRST_LINE, style, firstLineBlock == this ? style : 0);
+    } else if (!isAnonymous() && isRenderInline()) {
+        RenderStyle* parentStyle = parent()->firstLineStyle();
+        if (parentStyle != parent()->style())
+            result = getUncachedPseudoStyle(FIRST_LINE_INHERITED, parentStyle, style);
+    }
+
+    return result.release();
+}
+
+RenderStyle* RenderObject::firstLineStyleSlowCase() const
+{
+    ASSERT(document()->usesFirstLineRules());
+
+    RenderStyle* style = m_style.get();
+    const RenderObject* renderer = isText() ? parent() : this;
+    if (renderer->isBlockFlow()) {
+        if (RenderBlock* firstLineBlock = renderer->firstLineBlock())
+            style = firstLineBlock->getCachedPseudoStyle(FIRST_LINE, style);
+    } else if (!renderer->isAnonymous() && renderer->isRenderInline()) {
+        RenderStyle* parentStyle = renderer->parent()->firstLineStyle();
+        if (parentStyle != renderer->parent()->style()) {
+            // A first-line style is in effect. Cache a first-line style for ourselves.
+            renderer->style()->setHasPseudoStyle(FIRST_LINE_INHERITED);
+            style = renderer->getCachedPseudoStyle(FIRST_LINE_INHERITED, parentStyle);
+        }
+    }
+
+    return style;
+}
+
+RenderStyle* RenderObject::getCachedPseudoStyle(PseudoId pseudo, RenderStyle* parentStyle) const
+{
+    if (pseudo < FIRST_INTERNAL_PSEUDOID && !style()->hasPseudoStyle(pseudo))
+        return 0;
+
+    RenderStyle* cachedStyle = style()->getCachedPseudoStyle(pseudo);
+    if (cachedStyle)
+        return cachedStyle;
+    
+    RefPtr<RenderStyle> result = getUncachedPseudoStyle(pseudo, parentStyle);
+    if (result)
+        return style()->addCachedPseudoStyle(result.release());
+    return 0;
+}
+
+PassRefPtr<RenderStyle> RenderObject::getUncachedPseudoStyle(PseudoId pseudo, RenderStyle* parentStyle, RenderStyle* ownStyle) const
+{
+    if (pseudo < FIRST_INTERNAL_PSEUDOID && !ownStyle && !style()->hasPseudoStyle(pseudo))
+        return 0;
+    
+    if (!parentStyle) {
+        ASSERT(!ownStyle);
+        parentStyle = style();
+    }
+
+    Node* n = node();
+    while (n && !n->isElementNode())
+        n = n->parentNode();
+    if (!n)
+        return 0;
+
+    RefPtr<RenderStyle> result;
+    if (pseudo == FIRST_LINE_INHERITED) {
+        result = document()->styleSelector()->styleForElement(static_cast<Element*>(n), parentStyle, false);
+        result->setStyleType(FIRST_LINE_INHERITED);
+    } else
+        result = document()->styleSelector()->pseudoStyleForElement(pseudo, static_cast<Element*>(n), parentStyle);
+    return result.release();
+}
+
+static Color decorationColor(RenderObject* renderer)
+{
+    Color result;
+    if (renderer->style()->textStrokeWidth() > 0) {
+        // Prefer stroke color if possible but not if it's fully transparent.
+        result = renderer->style()->visitedDependentColor(CSSPropertyWebkitTextStrokeColor);
+        if (result.alpha())
+            return result;
+    }
+    
+    result = renderer->style()->visitedDependentColor(CSSPropertyWebkitTextFillColor);
+    return result;
+}
+
+void RenderObject::getTextDecorationColors(int decorations, Color& underline, Color& overline,
+                                           Color& linethrough, bool quirksMode)
+{
+    RenderObject* curr = this;
+    do {
+        int currDecs = curr->style()->textDecoration();
+        if (currDecs) {
+            if (currDecs & UNDERLINE) {
+                decorations &= ~UNDERLINE;
+                underline = decorationColor(curr);
+            }
+            if (currDecs & OVERLINE) {
+                decorations &= ~OVERLINE;
+                overline = decorationColor(curr);
+            }
+            if (currDecs & LINE_THROUGH) {
+                decorations &= ~LINE_THROUGH;
+                linethrough = decorationColor(curr);
+            }
+        }
+        curr = curr->parent();
+        if (curr && curr->isAnonymousBlock() && toRenderBlock(curr)->continuation())
+            curr = toRenderBlock(curr)->continuation();
+    } while (curr && decorations && (!quirksMode || !curr->node() ||
+                                     (!curr->node()->hasTagName(aTag) && !curr->node()->hasTagName(fontTag))));
+
+    // If we bailed out, use the element we bailed out at (typically a <font> or <a> element).
+    if (decorations && curr) {
+        if (decorations & UNDERLINE)
+            underline = decorationColor(curr);
+        if (decorations & OVERLINE)
+            overline = decorationColor(curr);
+        if (decorations & LINE_THROUGH)
+            linethrough = decorationColor(curr);
+    }
+}
+
+#if ENABLE(DASHBOARD_SUPPORT)
+void RenderObject::addDashboardRegions(Vector<DashboardRegionValue>& regions)
+{
+    // Convert the style regions to absolute coordinates.
+    if (style()->visibility() != VISIBLE || !isBox())
+        return;
+    
+    RenderBox* box = toRenderBox(this);
+
+    const Vector<StyleDashboardRegion>& styleRegions = style()->dashboardRegions();
+    unsigned i, count = styleRegions.size();
+    for (i = 0; i < count; i++) {
+        StyleDashboardRegion styleRegion = styleRegions[i];
+
+        LayoutUnit w = box->width();
+        LayoutUnit h = box->height();
+
+        DashboardRegionValue region;
+        region.label = styleRegion.label;
+        region.bounds = LayoutRect(styleRegion.offset.left().value(),
+                                   styleRegion.offset.top().value(),
+                                   w - styleRegion.offset.left().value() - styleRegion.offset.right().value(),
+                                   h - styleRegion.offset.top().value() - styleRegion.offset.bottom().value());
+        region.type = styleRegion.type;
+
+        region.clip = region.bounds;
+        computeAbsoluteRepaintRect(region.clip);
+        if (region.clip.height() < 0) {
+            region.clip.setHeight(0);
+            region.clip.setWidth(0);
+        }
+
+        FloatPoint absPos = localToAbsolute();
+        region.bounds.setX(absPos.x() + styleRegion.offset.left().value());
+        region.bounds.setY(absPos.y() + styleRegion.offset.top().value());
+
+        if (frame()) {
+            float deviceScaleFactor = frame()->page()->deviceScaleFactor();
+            if (deviceScaleFactor != 1.0f) {
+                region.bounds.scale(deviceScaleFactor);
+                region.clip.scale(deviceScaleFactor);
+            }
+        }
+
+        regions.append(region);
+    }
+}
+
+void RenderObject::collectDashboardRegions(Vector<DashboardRegionValue>& regions)
+{
+    // RenderTexts don't have their own style, they just use their parent's style,
+    // so we don't want to include them.
+    if (isText())
+        return;
+
+    addDashboardRegions(regions);
+    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
+        curr->collectDashboardRegions(regions);
+}
+#endif
+
+bool RenderObject::willRenderImage(CachedImage*)
+{
+    // Without visibility we won't render (and therefore don't care about animation).
+    if (style()->visibility() != VISIBLE)
+        return false;
+
+    // If we're not in a window (i.e., we're dormant from being put in the b/f cache or in a background tab)
+    // then we don't want to render either.
+    return !document()->inPageCache() && !document()->view()->isOffscreen();
+}
+
+LayoutUnit RenderObject::maximalOutlineSize(PaintPhase p) const
+{
+    if (p != PaintPhaseOutline && p != PaintPhaseSelfOutline && p != PaintPhaseChildOutlines)
+        return 0;
+    return toRenderView(document()->renderer())->maximalOutlineSize();
+}
+
+int RenderObject::caretMinOffset() const
+{
+    return 0;
+}
+
+int RenderObject::caretMaxOffset() const
+{
+    if (isReplaced())
+        return node() ? max(1U, node()->childNodeCount()) : 1;
+    if (isHR())
+        return 1;
+    return 0;
+}
+
+int RenderObject::previousOffset(int current) const
+{
+    return current - 1;
+}
+
+int RenderObject::previousOffsetForBackwardDeletion(int current) const
+{
+    return current - 1;
+}
+
+int RenderObject::nextOffset(int current) const
+{
+    return current + 1;
+}
+
+void RenderObject::adjustRectForOutlineAndShadow(LayoutRect& rect) const
+{
+    LayoutUnit outlineSize = outlineStyleForRepaint()->outlineSize();
+    if (const ShadowData* boxShadow = style()->boxShadow()) {
+        boxShadow->adjustRectForShadow(rect, outlineSize);
+        return;
+    }
+
+    rect.inflate(outlineSize);
+}
+
+AnimationController* RenderObject::animation() const
+{
+    return frame()->animation();
+}
+
+void RenderObject::imageChanged(CachedImage* image, const IntRect* rect)
+{
+    imageChanged(static_cast<WrappedImagePtr>(image), rect);
+}
+
+RenderBoxModelObject* RenderObject::offsetParent() const
+{
+    // If any of the following holds true return null and stop this algorithm:
+    // A is the root element.
+    // A is the HTML body element.
+    // The computed value of the position property for element A is fixed.
+    if (isRoot() || isBody() || (isPositioned() && style()->position() == FixedPosition))
+        return 0;
+
+    // If A is an area HTML element which has a map HTML element somewhere in the ancestor
+    // chain return the nearest ancestor map HTML element and stop this algorithm.
+    // FIXME: Implement!
+    
+    // Return the nearest ancestor element of A for which at least one of the following is
+    // true and stop this algorithm if such an ancestor is found:
+    //     * The computed value of the position property is not static.
+    //     * It is the HTML body element.
+    //     * The computed value of the position property of A is static and the ancestor
+    //       is one of the following HTML elements: td, th, or table.
+    //     * Our own extension: if there is a difference in the effective zoom
+
+    bool skipTables = isPositioned() || isRelPositioned();
+    float currZoom = style()->effectiveZoom();
+    RenderObject* curr = parent();
+    while (curr && (!curr->node() || (!curr->isPositioned() && !curr->isRelPositioned() && !curr->isBody()))) {
+        Node* element = curr->node();
+        if (!skipTables && element && (element->hasTagName(tableTag) || element->hasTagName(tdTag) || element->hasTagName(thTag)))
+            break;
+
+        float newZoom = curr->style()->effectiveZoom();
+        if (currZoom != newZoom)
+            break;
+        currZoom = newZoom;
+        curr = curr->parent();
+    }
+    return curr && curr->isBoxModelObject() ? toRenderBoxModelObject(curr) : 0;
+}
+
+VisiblePosition RenderObject::createVisiblePosition(int offset, EAffinity affinity)
+{
+    // If this is a non-anonymous renderer in an editable area, then it's simple.
+    if (Node* node = this->node()) {
+        if (!node->rendererIsEditable()) {
+            // If it can be found, we prefer a visually equivalent position that is editable. 
+            Position position = createLegacyEditingPosition(node, offset);
+            Position candidate = position.downstream(CanCrossEditingBoundary);
+            if (candidate.deprecatedNode()->rendererIsEditable())
+                return VisiblePosition(candidate, affinity);
+            candidate = position.upstream(CanCrossEditingBoundary);
+            if (candidate.deprecatedNode()->rendererIsEditable())
+                return VisiblePosition(candidate, affinity);
+        }
+        // FIXME: Eliminate legacy editing positions
+        return VisiblePosition(createLegacyEditingPosition(node, offset), affinity);
+    }
+
+    // We don't want to cross the boundary between editable and non-editable
+    // regions of the document, but that is either impossible or at least
+    // extremely unlikely in any normal case because we stop as soon as we
+    // find a single non-anonymous renderer.
+
+    // Find a nearby non-anonymous renderer.
+    RenderObject* child = this;
+    while (RenderObject* parent = child->parent()) {
+        // Find non-anonymous content after.
+        RenderObject* renderer = child;
+        while ((renderer = renderer->nextInPreOrder(parent))) {
+            if (Node* node = renderer->node())
+                return VisiblePosition(firstPositionInOrBeforeNode(node), DOWNSTREAM);
+        }
+
+        // Find non-anonymous content before.
+        renderer = child;
+        while ((renderer = renderer->previousInPreOrder())) {
+            if (renderer == parent)
+                break;
+            if (Node* node = renderer->node())
+                return VisiblePosition(lastPositionInOrAfterNode(node), DOWNSTREAM);
+        }
+
+        // Use the parent itself unless it too is anonymous.
+        if (Node* node = parent->node())
+            return VisiblePosition(firstPositionInOrBeforeNode(node), DOWNSTREAM);
+
+        // Repeat at the next level up.
+        child = parent;
+    }
+
+    // Everything was anonymous. Give up.
+    return VisiblePosition();
+}
+
+VisiblePosition RenderObject::createVisiblePosition(const Position& position)
+{
+    if (position.isNotNull())
+        return VisiblePosition(position);
+
+    ASSERT(!node());
+    return createVisiblePosition(0, DOWNSTREAM);
+}
+
+CursorDirective RenderObject::getCursor(const LayoutPoint&, Cursor&) const
+{
+    return SetCursorBasedOnStyle;
+}
+
+#if ENABLE(SVG)
+
+RenderSVGResourceContainer* RenderObject::toRenderSVGResourceContainer()
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+void RenderObject::setNeedsBoundariesUpdate()
+{
+    if (RenderObject* renderer = parent())
+        renderer->setNeedsBoundariesUpdate();
+}
+
+FloatRect RenderObject::objectBoundingBox() const
+{
+    ASSERT_NOT_REACHED();
+    return FloatRect();
+}
+
+FloatRect RenderObject::strokeBoundingBox() const
+{
+    ASSERT_NOT_REACHED();
+    return FloatRect();
+}
+
+// Returns the smallest rectangle enclosing all of the painted content
+// respecting clipping, masking, filters, opacity, stroke-width and markers
+FloatRect RenderObject::repaintRectInLocalCoordinates() const
+{
+    ASSERT_NOT_REACHED();
+    return FloatRect();
+}
+
+AffineTransform RenderObject::localTransform() const
+{
+    static const AffineTransform identity;
+    return identity;
+}
+
+const AffineTransform& RenderObject::localToParentTransform() const
+{
+    static const AffineTransform identity;
+    return identity;
+}
+
+bool RenderObject::nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint&, HitTestAction)
+{
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+#endif // ENABLE(SVG)
+
+} // namespace WebCore
+
+#ifndef NDEBUG
+
+void showTree(const WebCore::RenderObject* object)
+{
+    if (object)
+        object->showTreeForThis();
+}
+
+void showLineTree(const WebCore::RenderObject* object)
+{
+    if (object)
+        object->showLineTreeForThis();
+}
+
+void showRenderTree(const WebCore::RenderObject* object1)
+{
+    showRenderTree(object1, 0);
+}
+
+void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2)
+{
+    if (object1) {
+        const WebCore::RenderObject* root = object1;
+        while (root->parent())
+            root = root->parent();
+        root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
+    }
+}
+
+#endif