Add webkit to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3119 insertions, 0 deletions

diff --git a/webkit/pending/RenderObject.cpp b/webkit/pending/RenderObject.cpp
new file mode 100644
index 0000000..8bed31f
--- /dev/null
+++ b/webkit/pending/RenderObject.cpp
@@ -0,0 +1,3119 @@
+/*
+ * 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 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "RenderObject.h"
+
+#include "AXObjectCache.h"
+#include "AffineTransform.h"
+#include "AnimationController.h"
+#include "CSSStyleSelector.h"
+#include "CachedImage.h"
+#include "Chrome.h"
+#include "Document.h"
+#include "Element.h"
+#include "EventHandler.h"
+#include "EventNames.h"
+#include "FloatRect.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLNames.h"
+#include "HTMLOListElement.h"
+#include "HitTestRequest.h"
+#include "HitTestResult.h"
+#include "KURL.h"
+#include "Page.h"
+#include "PlatformScreen.h"
+#include "Position.h"
+#include "RenderArena.h"
+#include "RenderCounter.h"
+#include "RenderFlexibleBox.h"
+#include "RenderImage.h"
+#include "RenderInline.h"
+#include "RenderListItem.h"
+#include "RenderTableCell.h"
+#include "RenderTableCol.h"
+#include "RenderTableRow.h"
+#include "RenderText.h"
+#include "RenderTheme.h"
+#include "RenderView.h"
+#include "SelectionController.h"
+#include "TextResourceDecoder.h"
+#include "TextStream.h"
+#include <algorithm>
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace EventNames;
+using namespace HTMLNames;
+
+#ifndef NDEBUG
+static void* baseOfRenderObjectBeingDeleted;
+#endif
+
+void* RenderObject::operator new(size_t sz, RenderArena* renderArena) throw()
+{
+    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->m_next && contentData->m_type == CONTENT_OBJECT && doc != node) {
+        RenderImage* image = new (arena) RenderImage(node);
+        image->setStyle(style);
+        if (CachedResource* resource = contentData->m_content.m_object)
+            if (resource->type() == CachedResource::ImageResource)
+                image->setCachedImage(static_cast<CachedImage*>(resource));
+        image->setIsAnonymousImage(true);
+        return image;
+    }
+
+    RenderObject* o = 0;
+
+    switch (style->display()) {
+        case NONE:
+            break;
+        case INLINE:
+            o = new (arena) RenderInline(node);
+            break;
+        case BLOCK:
+            o = new (arena) RenderBlock(node);
+            break;
+        case INLINE_BLOCK:
+            o = new (arena) RenderBlock(node);
+            break;
+        case LIST_ITEM:
+            o = new (arena) RenderListItem(node);
+            break;
+        case RUN_IN:
+        case COMPACT:
+            o = new (arena) RenderBlock(node);
+            break;
+        case TABLE:
+        case INLINE_TABLE:
+            o = new (arena) RenderTable(node);
+            break;
+        case TABLE_ROW_GROUP:
+        case TABLE_HEADER_GROUP:
+        case TABLE_FOOTER_GROUP:
+            o = new (arena) RenderTableSection(node);
+            break;
+        case TABLE_ROW:
+            o = new (arena) RenderTableRow(node);
+            break;
+        case TABLE_COLUMN_GROUP:
+        case TABLE_COLUMN:
+            o = new (arena) RenderTableCol(node);
+            break;
+        case TABLE_CELL:
+            o = new (arena) RenderTableCell(node);
+            break;
+        case TABLE_CAPTION:
+            o = new (arena) RenderBlock(node);
+            break;
+        case BOX:
+        case INLINE_BOX:
+            o = new (arena) RenderFlexibleBox(node);
+            break;
+    }
+
+    return o;
+}
+
+#ifndef NDEBUG
+struct RenderObjectCounter {
+    static int count;
+    ~RenderObjectCounter() { if (count != 0) fprintf(stderr, "LEAK: %d RenderObject\n", count); }
+};
+int RenderObjectCounter::count;
+static RenderObjectCounter renderObjectCounter;
+#endif
+
+RenderObject::RenderObject(Node* node)
+    : CachedResourceClient()
+    , m_style(0)
+    , m_node(node)
+    , m_parent(0)
+    , m_previous(0)
+    , m_next(0)
+#ifndef NDEBUG
+    , m_hasAXObject(false)
+#endif
+    , m_verticalPosition(PositionUndefined)
+    , m_needsLayout(false)
+    , m_normalChildNeedsLayout(false)
+    , m_posChildNeedsLayout(false)
+    , m_prefWidthsDirty(false)
+    , m_floating(false)
+    , m_positioned(false)
+    , m_relPositioned(false)
+    , m_paintBackground(false)
+    , m_isAnonymous(node == node->document())
+    , m_isText(false)
+    , m_inline(true)
+    , m_replaced(false)
+    , m_isDragging(false)
+    , m_hasLayer(false)
+    , m_hasOverflowClip(false)
+    , m_hasTransform(false)
+    , m_hasOverrideSize(false)
+    , m_hasCounterNodeMap(false)
+{
+#ifndef NDEBUG
+    ++RenderObjectCounter::count;
+#endif
+}
+
+RenderObject::~RenderObject()
+{
+    ASSERT(!node() || documentBeingDestroyed() || !document()->frame()->view() || document()->frame()->view()->layoutRoot() != this);
+#ifndef NDEBUG
+    ASSERT(!m_hasAXObject);
+    --RenderObjectCounter::count;
+#endif
+}
+
+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()->hasTagName(bodyTag);
+}
+
+bool RenderObject::isHR() const
+{
+    return element() && element()->hasTagName(hrTag);
+}
+
+bool RenderObject::isHTMLMarquee() const
+{
+    return element() && element()->renderer() == this && element()->hasTagName(marqueeTag);
+}
+
+bool RenderObject::canHaveChildren() const
+{
+    return false;
+}
+
+RenderFlow* RenderObject::continuation() const
+{
+    return 0;
+}
+
+bool RenderObject::isInlineContinuation() const
+{
+    return false;
+}
+
+void RenderObject::addChild(RenderObject*, RenderObject*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+RenderObject* RenderObject::removeChildNode(RenderObject*, bool)
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+void RenderObject::removeChild(RenderObject*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+void RenderObject::moveChildNode(RenderObject*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+void RenderObject::appendChildNode(RenderObject*, bool)
+{
+    ASSERT_NOT_REACHED();
+}
+
+void RenderObject::insertChildNode(RenderObject*, RenderObject*, bool)
+{
+    ASSERT_NOT_REACHED();
+}
+
+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(RenderObject* stayWithin) const
+{
+    if (RenderObject* o = firstChild())
+        return o;
+
+    return nextInPreOrderAfterChildren(stayWithin);
+}
+
+RenderObject* RenderObject::nextInPreOrderAfterChildren(RenderObject* stayWithin) const
+{
+    if (this == stayWithin)
+        return 0;
+
+    RenderObject* o;
+    if (!(o = nextSibling())) {
+        o = parent();
+        while (o && !o->nextSibling()) {
+            o = o->parent();
+            if (o == stayWithin)
+                return 0;
+        }
+        if (o)
+            o = o->nextSibling();
+    }
+
+    return o;
+}
+
+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;
+}
+
+bool RenderObject::isEditable() const
+{
+    RenderText* textRenderer = 0;
+    if (isText())
+        textRenderer = static_cast<RenderText*>(const_cast<RenderObject*>(this));
+
+    return style()->visibility() == VISIBLE &&
+        element() && element()->isContentEditable() &&
+        ((isBlockFlow() && !firstChild()) ||
+        isReplaced() ||
+        isBR() ||
+        (textRenderer && textRenderer->firstTextBox()));
+}
+
+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(obj->layer(), beforeChild);
+        return;
+    }
+
+    for (RenderObject* curr = obj->firstChild(); curr; curr = curr->nextSibling())
+        addLayers(curr, parentLayer, newObject, beforeChild);
+}
+
+void RenderObject::addLayers(RenderLayer* parentLayer, RenderObject* newObject)
+{
+    if (!parentLayer)
+        return;
+
+    RenderObject* object = newObject;
+    RenderLayer* beforeChild = 0;
+    WebCore::addLayers(this, parentLayer, object, beforeChild);
+}
+
+void RenderObject::removeLayers(RenderLayer* parentLayer)
+{
+    if (!parentLayer)
+        return;
+
+    if (hasLayer()) {
+        parentLayer->removeChild(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()) {
+        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 = layer();
+    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->layer();
+        if (layer)
+            return layer;
+        curr = curr->parent();
+    }
+    return 0;
+}
+
+bool RenderObject::requiresLayer()
+{
+    return isRoot() || isPositioned() || isRelPositioned() || isTransparent() || hasOverflowClip() || hasTransform();
+}
+
+RenderBlock* RenderObject::firstLineBlock() const
+{
+    return 0;
+}
+
+int RenderObject::offsetLeft() const
+{
+    RenderObject* offsetPar = offsetParent();
+    if (!offsetPar)
+        return 0;
+    int x = xPos() - offsetPar->borderLeft();
+    if (!isPositioned()) {
+        if (isRelPositioned())
+            x += static_cast<const RenderBox*>(this)->relativePositionOffsetX();
+        RenderObject* curr = parent();
+        while (curr && curr != offsetPar) {
+            x += curr->xPos();
+            curr = curr->parent();
+        }
+        if (offsetPar->isBody() && !offsetPar->isRelPositioned() && !offsetPar->isPositioned())
+            x += offsetPar->xPos();
+    }
+    return x;
+}
+
+int RenderObject::offsetTop() const
+{
+    RenderObject* offsetPar = offsetParent();
+    if (!offsetPar)
+        return 0;
+    int y = yPos() - offsetPar->borderTop();
+    if (!isPositioned()) {
+        if (isRelPositioned())
+            y += static_cast<const RenderBox*>(this)->relativePositionOffsetY();
+        RenderObject* curr = parent();
+        while (curr && curr != offsetPar) {
+            if (!curr->isTableRow())
+                y += curr->yPos();
+            curr = curr->parent();
+        }
+        if (offsetPar->isBody() && !offsetPar->isRelPositioned() && !offsetPar->isPositioned())
+            y += offsetPar->yPos();
+    }
+    return y;
+}
+
+RenderObject* RenderObject::offsetParent() const
+{
+    // FIXME: It feels like this function could almost be written using containing blocks.
+    if (isBody())
+        return 0;
+
+    bool skipTables = isPositioned() || isRelPositioned();
+    RenderObject* curr = parent();
+    while (curr && (!curr->element() ||
+                    (!curr->isPositioned() && !curr->isRelPositioned() && !curr->isBody()))) {
+        if (!skipTables && curr->element() && (curr->element()->hasTagName(tableTag) || 
+                                               curr->element()->hasTagName(tdTag) || curr->element()->hasTagName(thTag)))
+            break;
+        curr = curr->parent();
+    }
+    return curr;
+}
+
+int RenderObject::verticalScrollbarWidth() const
+{
+    return includeVerticalScrollbarSize() ? layer()->verticalScrollbarWidth() : 0;
+}
+
+int RenderObject::horizontalScrollbarHeight() const
+{
+    return includeHorizontalScrollbarSize() ? layer()->horizontalScrollbarHeight() : 0;
+}
+
+// More IE extensions.  clientWidth and clientHeight represent the interior of an object
+// excluding border and scrollbar.
+int RenderObject::clientWidth() const
+{
+    return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
+}
+
+int RenderObject::clientHeight() const
+{
+    return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
+}
+
+// scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
+// object has overflow:hidden/scroll/auto specified and also has overflow.
+int RenderObject::scrollWidth() const
+{
+    return hasOverflowClip() ? layer()->scrollWidth() : overflowWidth();
+}
+
+int RenderObject::scrollHeight() const
+{
+    return hasOverflowClip() ? layer()->scrollHeight() : overflowHeight();
+}
+
+int RenderObject::scrollLeft() const
+{
+    return hasOverflowClip() ? layer()->scrollXOffset() : 0;
+}
+
+int RenderObject::scrollTop() const
+{
+    return hasOverflowClip() ? layer()->scrollYOffset() : 0;
+}
+
+void RenderObject::setScrollLeft(int newLeft)
+{
+    if (hasOverflowClip())
+        layer()->scrollToXOffset(newLeft);
+}
+
+void RenderObject::setScrollTop(int newTop)
+{
+    if (hasOverflowClip())
+        layer()->scrollToYOffset(newTop);
+}
+
+bool RenderObject::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
+{
+    RenderLayer* l = layer();
+    if (l && l->scroll(direction, granularity, multiplier))
+        return true;
+    RenderBlock* b = containingBlock();
+    if (b && !b->isRenderView())
+        return b->scroll(direction, granularity, multiplier);
+    return false;
+}
+
+bool RenderObject::shouldAutoscroll() const
+{
+    return ((isRoot()) || (hasOverflowClip() && (scrollsOverflow() || (node() && node()->isContentEditable()))));
+}
+
+void RenderObject::autoscroll()
+{
+    if (RenderLayer* l = layer())
+        l->autoscroll();
+}
+
+bool RenderObject::hasStaticX() const
+{
+    return (style()->left().isAuto() && style()->right().isAuto()) || style()->left().isStatic() || style()->right().isStatic();
+}
+
+bool RenderObject::hasStaticY() const
+{
+    return (style()->top().isAuto() && style()->bottom().isAuto()) || style()->top().isStatic();
+}
+
+void RenderObject::markAllDescendantsWithFloatsForLayout(RenderObject*)
+{
+}
+
+void RenderObject::setPrefWidthsDirty(bool b, bool markParents)
+{
+    bool alreadyDirty = m_prefWidthsDirty;
+    m_prefWidthsDirty = b;
+    if (b && !alreadyDirty && markParents && (isText() || (style()->position() != FixedPosition && style()->position() != AbsolutePosition)))
+        invalidateContainerPrefWidths();
+}
+
+void RenderObject::invalidateContainerPrefWidths()
+{
+    // 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->m_prefWidthsDirty) {
+        o->m_prefWidthsDirty = 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 = o->isTableCell() ? o->containingBlock() : o->container();
+    }
+}
+
+void RenderObject::setNeedsLayout(bool b, bool markParents)
+{
+    bool alreadyNeededLayout = m_needsLayout;
+    m_needsLayout = b;
+    if (b) {
+        if (!alreadyNeededLayout) {
+            if (markParents)
+                markContainingBlocksForLayout();
+            if (hasLayer())
+                layer()->setNeedsFullRepaint();
+        }
+    } else {
+        m_posChildNeedsLayout = false;
+        m_normalChildNeedsLayout = false;
+    }
+}
+
+void RenderObject::setChildNeedsLayout(bool b, bool markParents)
+{
+    bool alreadyNeededLayout = m_normalChildNeedsLayout;
+    m_normalChildNeedsLayout = b;
+    if (b) {
+        if (!alreadyNeededLayout && markParents)
+            markContainingBlocksForLayout();
+    } else {
+        m_posChildNeedsLayout = false;
+        m_normalChildNeedsLayout = false;
+    }
+}
+
+static inline bool objectIsRelayoutBoundary(const RenderObject *obj) 
+{
+    // FIXME: In future it may be possible to broaden this condition in order to improve performance 
+    return obj->isTextField() || obj->isTextArea()
+        || obj->hasOverflowClip() && !obj->style()->width().isIntrinsicOrAuto() && !obj->style()->height().isIntrinsicOrAuto() && !obj->style()->height().isPercent()
+#if ENABLE(SVG)
+           || obj->isSVGRoot()
+#endif
+           ;
+}
+    
+void RenderObject::markContainingBlocksForLayout(bool scheduleRelayout, RenderObject* newRoot)
+{
+    ASSERT(!scheduleRelayout || !newRoot);
+
+    RenderObject* o = container();
+    RenderObject* last = this;
+
+    while (o) {
+        if (!last->isText() && (last->style()->position() == FixedPosition || last->style()->position() == AbsolutePosition)) {
+            if (last->hasStaticY()) {
+                RenderObject* parent = last->parent();
+                if (!parent->normalChildNeedsLayout()) {
+                    parent->setChildNeedsLayout(true, false);
+                    if (parent != newRoot)
+                        parent->markContainingBlocksForLayout(scheduleRelayout, newRoot);
+                }
+            }
+            if (o->m_posChildNeedsLayout)
+                return;
+            o->m_posChildNeedsLayout = true;
+        } else {
+            if (o->m_normalChildNeedsLayout)
+                return;
+            o->m_normalChildNeedsLayout = true;
+        }
+
+        if (o == newRoot)
+            return;
+
+        last = o;
+        if (scheduleRelayout && objectIsRelayoutBoundary(last))
+            break;
+        o = o->container();
+    }
+
+    if (scheduleRelayout)
+        last->scheduleRelayout();
+}
+
+RenderBlock* RenderObject::containingBlock() const
+{
+    if (isTableCell()) {
+        const RenderTableCell* cell = static_cast<const RenderTableCell*>(this);
+        if (parent() && cell->section())
+            return cell->table();
+        return 0;
+    }
+
+    if (isRenderView())
+        return const_cast<RenderBlock*>(static_cast<const RenderBlock*>(this));
+
+    RenderObject* o = parent();
+    if (!isText() && m_style->position() == FixedPosition) {
+        while (o && !o->isRenderView() && !o->hasTransform())
+            o = o->parent();
+    } else if (!isText() && m_style->position() == AbsolutePosition) {
+        while (o && (o->style()->position() == StaticPosition || (o->isInline() && !o->isReplaced())) && !o->isRenderView() && !o->hasTransform()) {
+            // For relpositioned inlines, we return the nearest 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())
+                return o->containingBlock();
+            o = o->parent();
+        }
+    } else {
+        while (o && ((o->isInline() && !o->isReplaced()) || o->isTableRow() || o->isTableSection()
+                     || o->isTableCol() || o->isFrameSet() || o->isMedia()
+#if ENABLE(SVG)
+                     || o->isSVGContainer() || o->isSVGRoot()
+#endif
+                     ))
+            o = o->parent();
+    }
+
+    if (!o || !o->isRenderBlock())
+        return 0; // Probably doesn't happen any more, but leave just in case. -dwh
+
+    return static_cast<RenderBlock*>(o);
+}
+
+int RenderObject::containingBlockWidth() const
+{
+    // FIXME ?
+    return containingBlock()->availableWidth();
+}
+
+int RenderObject::containingBlockHeight() const
+{
+    // FIXME ?
+    return containingBlock()->contentHeight();
+}
+
+bool RenderObject::mustRepaintBackgroundOrBorder() const
+{
+    // If we don't have a background/border, then nothing to do.
+    if (!hasBoxDecorations())
+        return false;
+
+    // Ok, let's check the background first.
+    const BackgroundLayer* bgLayer = style()->backgroundLayers();
+
+    // Nobody will use multiple background layers without wanting fancy positioning.
+    if (bgLayer->next())
+        return true;
+
+    // Make sure we have a valid background image.
+    CachedImage* bg = bgLayer->backgroundImage();
+    bool shouldPaintBackgroundImage = bg && bg->canRender();
+
+    // These are always percents or auto.
+    if (shouldPaintBackgroundImage &&
+            (!bgLayer->backgroundXPosition().isZero() || !bgLayer->backgroundYPosition().isZero() ||
+             bgLayer->backgroundSize().width.isPercent() || bgLayer->backgroundSize().height.isPercent()))
+        // The background image will shift unpredictably if the size changes.
+        return true;
+
+    // Background is ok.  Let's check border.
+    if (style()->hasBorder()) {
+        // Border images are not ok.
+        CachedImage* borderImage = style()->borderImage().image();
+        bool shouldPaintBorderImage = borderImage && borderImage->canRender();
+
+        // If the image hasn't loaded, we're still using the normal border style.
+        if (shouldPaintBorderImage && borderImage->isLoaded())
+            return true;
+    }
+
+    return false;
+}
+
+void RenderObject::drawBorderArc(GraphicsContext* graphicsContext, int x, int y, float thickness, IntSize radius,
+                                 int angleStart, int angleSpan, BorderSide s, Color c, const Color& textColor,
+                                 EBorderStyle style, bool firstCorner)
+{
+    if ((style == DOUBLE && thickness / 2 < 3) || ((style == RIDGE || style == GROOVE) && thickness / 2 < 2))
+        style = SOLID;
+
+    if (!c.isValid()) {
+        if (style == INSET || style == OUTSET || style == RIDGE || style == GROOVE)
+            c.setRGB(238, 238, 238);
+        else
+            c = textColor;
+    }
+
+    switch (style) {
+        case BNONE:
+        case BHIDDEN:
+            return;
+        case DOTTED:
+        case DASHED:
+            graphicsContext->setStrokeColor(c);
+            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(c);
+            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 = c.dark();
+            else {
+                c2 = c;
+                c = c.dark();
+            }
+
+            graphicsContext->setStrokeStyle(SolidStroke);
+            graphicsContext->setStrokeColor(c);
+            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);
+            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)
+                c = c.dark();
+        case OUTSET:
+            if (style == OUTSET && (s == BSBottom || s == BSRight))
+                c = c.dark();
+        case SOLID:
+            graphicsContext->setStrokeStyle(SolidStroke);
+            graphicsContext->setStrokeColor(c);
+            graphicsContext->setStrokeThickness(thickness);
+            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
+            break;
+    }
+}
+
+void RenderObject::drawBorder(GraphicsContext* graphicsContext, int x1, int y1, int x2, int y2,
+                              BorderSide s, Color c, const Color& textcolor, EBorderStyle style,
+                              int adjbw1, int adjbw2)
+{
+    int width = (s == BSTop || s == BSBottom ? y2 - y1 : x2 - x1);
+
+    if (style == DOUBLE && width < 3)
+        style = SOLID;
+
+    if (!c.isValid()) {
+        if (style == INSET || style == OUTSET || style == RIDGE || style == GROOVE)
+            c.setRGB(238, 238, 238);
+        else
+            c = textcolor;
+    }
+
+    switch (style) {
+        case BNONE:
+        case BHIDDEN:
+            return;
+        case DOTTED:
+        case DASHED:
+            graphicsContext->setStrokeColor(c);
+            graphicsContext->setStrokeThickness(width);
+            graphicsContext->setStrokeStyle(style == DASHED ? DashedStroke : DottedStroke);
+
+            if (width > 0)
+                switch (s) {
+                    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;
+                }
+            break;
+        case DOUBLE: {
+            int third = (width + 1) / 3;
+
+            if (adjbw1 == 0 && adjbw2 == 0) {
+                graphicsContext->setStrokeStyle(NoStroke);
+                graphicsContext->setFillColor(c);
+                switch (s) {
+                    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;
+                }
+            } else {
+                int adjbw1bigthird = ((adjbw1 > 0) ? adjbw1 + 1 : adjbw1 - 1) / 3;
+                int adjbw2bigthird = ((adjbw2 > 0) ? adjbw2 + 1 : adjbw2 - 1) / 3;
+
+                switch (s) {
+                    case BSTop:
+                        drawBorder(graphicsContext, x1 + max((-adjbw1 * 2 + 1) / 3, 0),
+                                   y1, x2 - max((-adjbw2 * 2 + 1) / 3, 0), y1 + third,
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        drawBorder(graphicsContext, x1 + max((adjbw1 * 2 + 1) / 3, 0),
+                                   y2 - third, x2 - max((adjbw2 * 2 + 1) / 3, 0), y2,
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        break;
+                    case BSLeft:
+                        drawBorder(graphicsContext, x1, y1 + max((-adjbw1 * 2 + 1) / 3, 0),
+                                   x1 + third, y2 - max((-adjbw2 * 2 + 1) / 3, 0),
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        drawBorder(graphicsContext, x2 - third, y1 + max((adjbw1 * 2 + 1) / 3, 0),
+                                   x2, y2 - max((adjbw2 * 2 + 1) / 3, 0),
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        break;
+                    case BSBottom:
+                        drawBorder(graphicsContext, x1 + max((adjbw1 * 2 + 1) / 3, 0),
+                                   y1, x2 - max((adjbw2 * 2 + 1) / 3, 0), y1 + third,
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        drawBorder(graphicsContext, x1 + max((-adjbw1 * 2 + 1) / 3, 0),
+                                   y2 - third, x2 - max((-adjbw2 * 2 + 1) / 3, 0), y2,
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        break;
+                    case BSRight:
+                        drawBorder(graphicsContext, x1, y1 + max((adjbw1 * 2 + 1) / 3, 0),
+                                   x1 + third, y2 - max(( adjbw2 * 2 + 1) / 3, 0),
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        drawBorder(graphicsContext, x2 - third, y1 + max((-adjbw1 * 2 + 1) / 3, 0),
+                                   x2, y2 - max((-adjbw2 * 2 + 1) / 3, 0),
+                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
+                        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 adjbw1bighalf = ((adjbw1 > 0) ? adjbw1 + 1 : adjbw1 - 1) / 2;
+            int adjbw2bighalf = ((adjbw2 > 0) ? adjbw2 + 1 : adjbw2 - 1) / 2;
+
+            switch (s) {
+                case BSTop:
+                    drawBorder(graphicsContext, x1 + max(-adjbw1, 0) / 2, y1, x2 - max(-adjbw2, 0) / 2, (y1 + y2 + 1) / 2,
+                               s, c, textcolor, s1, adjbw1bighalf, adjbw2bighalf);
+                    drawBorder(graphicsContext, x1 + max(adjbw1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(adjbw2 + 1, 0) / 2, y2,
+                               s, c, textcolor, s2, adjbw1 / 2, adjbw2 / 2);
+                    break;
+                case BSLeft:
+                    drawBorder(graphicsContext, x1, y1 + max(-adjbw1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(-adjbw2, 0) / 2,
+                               s, c, textcolor, s1, adjbw1bighalf, adjbw2bighalf);
+                    drawBorder(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(adjbw1 + 1, 0) / 2, x2, y2 - max(adjbw2 + 1, 0) / 2,
+                               s, c, textcolor, s2, adjbw1 / 2, adjbw2 / 2);
+                    break;
+                case BSBottom:
+                    drawBorder(graphicsContext, x1 + max(adjbw1, 0) / 2, y1, x2 - max(adjbw2, 0) / 2, (y1 + y2 + 1) / 2,
+                               s, c, textcolor, s2, adjbw1bighalf, adjbw2bighalf);
+                    drawBorder(graphicsContext, x1 + max(-adjbw1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(-adjbw2 + 1, 0) / 2, y2,
+                               s, c, textcolor, s1, adjbw1/2, adjbw2/2);
+                    break;
+                case BSRight:
+                    drawBorder(graphicsContext, x1, y1 + max(adjbw1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(adjbw2, 0) / 2,
+                               s, c, textcolor, s2, adjbw1bighalf, adjbw2bighalf);
+                    drawBorder(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(-adjbw1 + 1, 0) / 2, x2, y2 - max(-adjbw2 + 1, 0) / 2,
+                               s, c, textcolor, s1, adjbw1/2, adjbw2/2);
+                    break;
+            }
+            break;
+        }
+        case INSET:
+            if (s == BSTop || s == BSLeft)
+                c = c.dark();
+            // fall through
+        case OUTSET:
+            if (style == OUTSET && (s == BSBottom || s == BSRight))
+                c = c.dark();
+            // fall through
+        case SOLID: {
+            graphicsContext->setStrokeStyle(NoStroke);
+            graphicsContext->setFillColor(c);
+            ASSERT(x2 >= x1);
+            ASSERT(y2 >= y1);
+            if (!adjbw1 && !adjbw2) {
+                graphicsContext->drawRect(IntRect(x1, y1, x2 - x1, y2 - y1));
+                return;
+            }
+            FloatPoint quad[4];
+            switch (s) {
+                case BSTop:
+                    quad[0] = FloatPoint(x1 + max(-adjbw1, 0), y1);
+                    quad[1] = FloatPoint(x1 + max(adjbw1, 0), y2);
+                    quad[2] = FloatPoint(x2 - max(adjbw2, 0), y2);
+                    quad[3] = FloatPoint(x2 - max(-adjbw2, 0), y1);
+                    break;
+                case BSBottom:
+                    quad[0] = FloatPoint(x1 + max(adjbw1, 0), y1);
+                    quad[1] = FloatPoint(x1 + max(-adjbw1, 0), y2);
+                    quad[2] = FloatPoint(x2 - max(-adjbw2, 0), y2);
+                    quad[3] = FloatPoint(x2 - max(adjbw2, 0), y1);
+                    break;
+                case BSLeft:
+                    quad[0] = FloatPoint(x1, y1 + max(-adjbw1, 0));
+                    quad[1] = FloatPoint(x1, y2 - max(-adjbw2, 0));
+                    quad[2] = FloatPoint(x2, y2 - max(adjbw2, 0));
+                    quad[3] = FloatPoint(x2, y1 + max(adjbw1, 0));
+                    break;
+                case BSRight:
+                    quad[0] = FloatPoint(x1, y1 + max(adjbw1, 0));
+                    quad[1] = FloatPoint(x1, y2 - max(adjbw2, 0));
+                    quad[2] = FloatPoint(x2, y2 - max(-adjbw2, 0));
+                    quad[3] = FloatPoint(x2, y1 + max(-adjbw1, 0));
+                    break;
+            }
+            graphicsContext->drawConvexPolygon(4, quad);
+            break;
+        }
+    }
+}
+
+bool RenderObject::paintBorderImage(GraphicsContext* graphicsContext, int tx, int ty, int w, int h, const RenderStyle* style)
+{
+    CachedImage* borderImage = style->borderImage().image();
+    if (!borderImage->isLoaded())
+        return true; // Never paint a border image incrementally, but don't paint the fallback borders either.
+
+    // If we have a border radius, the border image gets clipped to the rounded rect.
+    bool clipped = false;
+    if (style->hasBorderRadius()) {
+        IntRect clipRect(tx, ty, w, h);
+        graphicsContext->save();
+        graphicsContext->addRoundedRectClip(clipRect, style->borderTopLeftRadius(), style->borderTopRightRadius(),
+                                            style->borderBottomLeftRadius(), style->borderBottomRightRadius());
+        clipped = true;
+    }
+
+    borderImage->setImageContainerSize(IntSize(w, h));
+    int imageWidth = borderImage->image()->width();
+    int imageHeight = borderImage->image()->height();
+
+    int topSlice = min(imageHeight, style->borderImage().m_slices.top.calcValue(borderImage->image()->height()));
+    int bottomSlice = min(imageHeight, style->borderImage().m_slices.bottom.calcValue(borderImage->image()->height()));
+    int leftSlice = min(imageWidth, style->borderImage().m_slices.left.calcValue(borderImage->image()->width()));
+    int rightSlice = min(imageWidth, style->borderImage().m_slices.right.calcValue(borderImage->image()->width()));
+
+    EBorderImageRule hRule = style->borderImage().horizontalRule();
+    EBorderImageRule vRule = style->borderImage().verticalRule();
+
+    bool drawLeft = leftSlice > 0 && style->borderLeftWidth() > 0;
+    bool drawTop = topSlice > 0 && style->borderTopWidth() > 0;
+    bool drawRight = rightSlice > 0 && style->borderRightWidth() > 0;
+    bool drawBottom = bottomSlice > 0 && style->borderBottomWidth() > 0;
+    bool drawMiddle = (imageWidth - leftSlice - rightSlice) > 0 && (w - style->borderLeftWidth() - style->borderRightWidth()) > 0 &&
+                      (imageHeight - topSlice - bottomSlice) > 0 && (h - style->borderTopWidth() - style->borderBottomWidth()) > 0;
+
+    if (drawLeft) {
+        // Paint the top and bottom left corners.
+
+        // The top left corner rect is (tx, ty, leftWidth, topWidth)
+        // The rect to use from within the image is obtained from our slice, and is (0, 0, leftSlice, topSlice)
+        if (drawTop)
+            graphicsContext->drawImage(borderImage->image(), IntRect(tx, ty, style->borderLeftWidth(), style->borderTopWidth()),
+                                       IntRect(0, 0, leftSlice, topSlice));
+
+        // The bottom left corner rect is (tx, ty + h - bottomWidth, leftWidth, bottomWidth)
+        // The rect to use from within the image is (0, imageHeight - bottomSlice, leftSlice, botomSlice)
+        if (drawBottom)
+            graphicsContext->drawImage(borderImage->image(), IntRect(tx, ty + h - style->borderBottomWidth(), style->borderLeftWidth(), style->borderBottomWidth()),
+                                       IntRect(0, imageHeight - bottomSlice, leftSlice, bottomSlice));
+
+        // Paint the left edge.
+        // Have to scale and tile into the border rect.
+        graphicsContext->drawTiledImage(borderImage->image(), IntRect(tx, ty + style->borderTopWidth(), style->borderLeftWidth(),
+                                        h - style->borderTopWidth() - style->borderBottomWidth()),
+                                        IntRect(0, topSlice, leftSlice, imageHeight - topSlice - bottomSlice),
+                                        Image::StretchTile, (Image::TileRule)vRule);
+    }
+
+    if (drawRight) {
+        // Paint the top and bottom right corners
+        // The top right corner rect is (tx + w - rightWidth, ty, rightWidth, topWidth)
+        // The rect to use from within the image is obtained from our slice, and is (imageWidth - rightSlice, 0, rightSlice, topSlice)
+        if (drawTop)
+            graphicsContext->drawImage(borderImage->image(), IntRect(tx + w - style->borderRightWidth(), ty, style->borderRightWidth(), style->borderTopWidth()),
+                                       IntRect(imageWidth - rightSlice, 0, rightSlice, topSlice));
+
+        // The bottom right corner rect is (tx + w - rightWidth, ty + h - bottomWidth, rightWidth, bottomWidth)
+        // The rect to use from within the image is (imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, botomSlice)
+        if (drawBottom)
+            graphicsContext->drawImage(borderImage->image(), IntRect(tx + w - style->borderRightWidth(), ty + h - style->borderBottomWidth(), style->borderRightWidth(), style->borderBottomWidth()),
+                                       IntRect(imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, bottomSlice));
+
+        // Paint the right edge.
+        graphicsContext->drawTiledImage(borderImage->image(), IntRect(tx + w - style->borderRightWidth(), ty + style->borderTopWidth(), style->borderRightWidth(),
+                                        h - style->borderTopWidth() - style->borderBottomWidth()),
+                                        IntRect(imageWidth - rightSlice, topSlice, rightSlice, imageHeight - topSlice - bottomSlice),
+                                        Image::StretchTile, (Image::TileRule)vRule);
+    }
+
+    // Paint the top edge.
+    if (drawTop)
+        graphicsContext->drawTiledImage(borderImage->image(), IntRect(tx + style->borderLeftWidth(), ty, w - style->borderLeftWidth() - style->borderRightWidth(), style->borderTopWidth()),
+                                        IntRect(leftSlice, 0, imageWidth - rightSlice - leftSlice, topSlice),
+                                        (Image::TileRule)hRule, Image::StretchTile);
+
+    // Paint the bottom edge.
+    if (drawBottom)
+        graphicsContext->drawTiledImage(borderImage->image(), IntRect(tx + style->borderLeftWidth(), ty + h - style->borderBottomWidth(),
+                                        w - style->borderLeftWidth() - style->borderRightWidth(), style->borderBottomWidth()),
+                                        IntRect(leftSlice, imageHeight - bottomSlice, imageWidth - rightSlice - leftSlice, bottomSlice),
+                                        (Image::TileRule)hRule, Image::StretchTile);
+
+    // Paint the middle.
+    if (drawMiddle)
+        graphicsContext->drawTiledImage(borderImage->image(), IntRect(tx + style->borderLeftWidth(), ty + style->borderTopWidth(), w - style->borderLeftWidth() - style->borderRightWidth(),
+                                        h - style->borderTopWidth() - style->borderBottomWidth()),
+                                        IntRect(leftSlice, topSlice, imageWidth - rightSlice - leftSlice, imageHeight - topSlice - bottomSlice),
+                                        (Image::TileRule)hRule, (Image::TileRule)vRule);
+
+    // Clear the clip for the border radius.
+    if (clipped)
+        graphicsContext->restore();
+
+    return true;
+}
+
+void RenderObject::paintBorder(GraphicsContext* graphicsContext, int tx, int ty, int w, int h,
+                               const RenderStyle* style, bool begin, bool end)
+{
+    CachedImage* borderImage = style->borderImage().image();
+    bool shouldPaintBackgroundImage = borderImage && borderImage->canRender();
+    if (shouldPaintBackgroundImage)
+        shouldPaintBackgroundImage = paintBorderImage(graphicsContext, tx, ty, w, h, style);
+
+    if (shouldPaintBackgroundImage)
+        return;
+
+    const Color& tc = style->borderTopColor();
+    const Color& bc = style->borderBottomColor();
+    const Color& lc = style->borderLeftColor();
+    const Color& rc = style->borderRightColor();
+
+    bool tt = style->borderTopIsTransparent();
+    bool bt = style->borderBottomIsTransparent();
+    bool rt = style->borderRightIsTransparent();
+    bool lt = style->borderLeftIsTransparent();
+
+    EBorderStyle ts = style->borderTopStyle();
+    EBorderStyle bs = style->borderBottomStyle();
+    EBorderStyle ls = style->borderLeftStyle();
+    EBorderStyle rs = style->borderRightStyle();
+
+    bool renderTop = ts > BHIDDEN && !tt;
+    bool renderLeft = ls > BHIDDEN && begin && !lt;
+    bool renderRight = rs > BHIDDEN && end && !rt;
+    bool renderBottom = bs > BHIDDEN && !bt;
+
+    // Need sufficient width and height to contain border radius curves.  Sanity check our border radii
+    // and our width/height values to make sure the curves can all fit. If not, then we won't paint
+    // any border radii.
+    bool renderRadii = false;
+    IntSize topLeft = style->borderTopLeftRadius();
+    IntSize topRight = style->borderTopRightRadius();
+    IntSize bottomLeft = style->borderBottomLeftRadius();
+    IntSize bottomRight = style->borderBottomRightRadius();
+
+    if (style->hasBorderRadius() &&
+        static_cast<unsigned>(w) >= static_cast<unsigned>(topLeft.width()) + static_cast<unsigned>(topRight.width()) &&
+        static_cast<unsigned>(w) >= static_cast<unsigned>(bottomLeft.width()) + static_cast<unsigned>(bottomRight.width()) &&
+        static_cast<unsigned>(h) >= static_cast<unsigned>(topLeft.height()) + static_cast<unsigned>(bottomLeft.height()) &&
+        static_cast<unsigned>(h) >= static_cast<unsigned>(topRight.height()) + static_cast<unsigned>(bottomRight.height()))
+        renderRadii = true;
+
+    // Clip to the rounded rectangle.
+    if (renderRadii) {
+        graphicsContext->save();
+        graphicsContext->addRoundedRectClip(IntRect(tx, ty, w, h), topLeft, topRight, bottomLeft, bottomRight);
+    }
+
+    int firstAngleStart, secondAngleStart, firstAngleSpan, secondAngleSpan;
+    float thickness;
+    bool upperLeftBorderStylesMatch = renderLeft && (ts == ls) && (tc == lc);
+    bool upperRightBorderStylesMatch = renderRight && (ts == rs) && (tc == rc) && (ts != OUTSET) && (ts != RIDGE) && (ts != INSET) && (ts != GROOVE);
+    bool lowerLeftBorderStylesMatch = renderLeft && (bs == ls) && (bc == lc) && (bs != OUTSET) && (bs != RIDGE) && (bs != INSET) && (bs != GROOVE);
+    bool lowerRightBorderStylesMatch = renderRight && (bs == rs) && (bc == rc);
+
+    if (renderTop) {
+        bool ignore_left = (renderRadii && topLeft.width() > 0) ||
+            (tc == lc && tt == lt && ts >= OUTSET &&
+             (ls == DOTTED || ls == DASHED || ls == SOLID || ls == OUTSET));
+
+        bool ignore_right = (renderRadii && topRight.width() > 0) ||
+            (tc == rc && tt == rt && ts >= OUTSET &&
+             (rs == DOTTED || rs == DASHED || rs == SOLID || rs == INSET));
+
+        int x = tx;
+        int x2 = tx + w;
+        if (renderRadii) {
+            x += topLeft.width();
+            x2 -= topRight.width();
+        }
+
+        drawBorder(graphicsContext, x, ty, x2, ty + style->borderTopWidth(), BSTop, tc, style->color(), ts,
+                   ignore_left ? 0 : style->borderLeftWidth(), ignore_right ? 0 : style->borderRightWidth());
+
+        if (renderRadii) {
+            int leftY = ty;
+
+            // We make the arc double thick and let the clip rect take care of clipping the extra off.
+            // We're doing this because it doesn't seem possible to match the curve of the clip exactly
+            // with the arc-drawing function.
+            thickness = style->borderTopWidth() * 2;
+
+            if (topLeft.width()) {
+                int leftX = tx;
+                // The inner clip clips inside the arc. This is especially important for 1px borders.
+                bool applyLeftInnerClip = (style->borderLeftWidth() < topLeft.width())
+                    && (style->borderTopWidth() < topLeft.height())
+                    && (ts != DOUBLE || style->borderTopWidth() > 6);
+                if (applyLeftInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(leftX, leftY, topLeft.width() * 2, topLeft.height() * 2),
+                                                             style->borderTopWidth());
+                }
+
+                firstAngleStart = 90;
+                firstAngleSpan = upperLeftBorderStylesMatch ? 90 : 45;
+
+                // Draw upper left arc
+                drawBorderArc(graphicsContext, leftX, leftY, thickness, topLeft, firstAngleStart, firstAngleSpan,
+                              BSTop, tc, style->color(), ts, true);
+                if (applyLeftInnerClip)
+                    graphicsContext->restore();
+            }
+
+            if (topRight.width()) {
+                int rightX = tx + w - topRight.width() * 2;
+                bool applyRightInnerClip = (style->borderRightWidth() < topRight.width())
+                    && (style->borderTopWidth() < topRight.height())
+                    && (ts != DOUBLE || style->borderTopWidth() > 6);
+                if (applyRightInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(rightX, leftY, topRight.width() * 2, topRight.height() * 2),
+                                                             style->borderTopWidth());
+                }
+
+                if (upperRightBorderStylesMatch) {
+                    secondAngleStart = 0;
+                    secondAngleSpan = 90;
+                } else {
+                    secondAngleStart = 45;
+                    secondAngleSpan = 45;
+                }
+
+                // Draw upper right arc
+                drawBorderArc(graphicsContext, rightX, leftY, thickness, topRight, secondAngleStart, secondAngleSpan,
+                              BSTop, tc, style->color(), ts, false);
+                if (applyRightInnerClip)
+                    graphicsContext->restore();
+            }
+        }
+    }
+
+    if (renderBottom) {
+        bool ignore_left = (renderRadii && bottomLeft.width() > 0) ||
+            (bc == lc && bt == lt && bs >= OUTSET &&
+             (ls == DOTTED || ls == DASHED || ls == SOLID || ls == OUTSET));
+
+        bool ignore_right = (renderRadii && bottomRight.width() > 0) ||
+            (bc == rc && bt == rt && bs >= OUTSET &&
+             (rs == DOTTED || rs == DASHED || rs == SOLID || rs == INSET));
+
+        int x = tx;
+        int x2 = tx + w;
+        if (renderRadii) {
+            x += bottomLeft.width();
+            x2 -= bottomRight.width();
+        }
+
+        drawBorder(graphicsContext, x, ty + h - style->borderBottomWidth(), x2, ty + h, BSBottom, bc, style->color(), bs,
+                   ignore_left ? 0 : style->borderLeftWidth(), ignore_right ? 0 : style->borderRightWidth());
+
+        if (renderRadii) {
+            thickness = style->borderBottomWidth() * 2;
+
+            if (bottomLeft.width()) {
+                int leftX = tx;
+                int leftY = ty + h - bottomLeft.height() * 2;
+                bool applyLeftInnerClip = (style->borderLeftWidth() < bottomLeft.width())
+                    && (style->borderBottomWidth() < bottomLeft.height())
+                    && (bs != DOUBLE || style->borderBottomWidth() > 6);
+                if (applyLeftInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(leftX, leftY, bottomLeft.width() * 2, bottomLeft.height() * 2),
+                                                             style->borderBottomWidth());
+                }
+
+                if (lowerLeftBorderStylesMatch) {
+                    firstAngleStart = 180;
+                    firstAngleSpan = 90;
+                } else {
+                    firstAngleStart = 225;
+                    firstAngleSpan = 45;
+                }
+
+                // Draw lower left arc
+                drawBorderArc(graphicsContext, leftX, leftY, thickness, bottomLeft, firstAngleStart, firstAngleSpan,
+                              BSBottom, bc, style->color(), bs, true);
+                if (applyLeftInnerClip)
+                    graphicsContext->restore();
+            }
+
+            if (bottomRight.width()) {
+                int rightY = ty + h - bottomRight.height() * 2;
+                int rightX = tx + w - bottomRight.width() * 2;
+                bool applyRightInnerClip = (style->borderRightWidth() < bottomRight.width())
+                    && (style->borderBottomWidth() < bottomRight.height())
+                    && (bs != DOUBLE || style->borderBottomWidth() > 6);
+                if (applyRightInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(rightX, rightY, bottomRight.width() * 2, bottomRight.height() * 2),
+                                                             style->borderBottomWidth());
+                }
+
+                secondAngleStart = 270;
+                secondAngleSpan = lowerRightBorderStylesMatch ? 90 : 45;
+
+                // Draw lower right arc
+                drawBorderArc(graphicsContext, rightX, rightY, thickness, bottomRight, secondAngleStart, secondAngleSpan,
+                              BSBottom, bc, style->color(), bs, false);
+                if (applyRightInnerClip)
+                    graphicsContext->restore();
+            }
+        }
+    }
+
+    if (renderLeft) {
+        bool ignore_top = (renderRadii && topLeft.height() > 0) ||
+            (tc == lc && tt == lt && ls >= OUTSET &&
+             (ts == DOTTED || ts == DASHED || ts == SOLID || ts == OUTSET));
+
+        bool ignore_bottom = (renderRadii && bottomLeft.height() > 0) ||
+            (bc == lc && bt == lt && ls >= OUTSET &&
+             (bs == DOTTED || bs == DASHED || bs == SOLID || bs == INSET));
+
+        int y = ty;
+        int y2 = ty + h;
+        if (renderRadii) {
+            y += topLeft.height();
+            y2 -= bottomLeft.height();
+        }
+
+        drawBorder(graphicsContext, tx, y, tx + style->borderLeftWidth(), y2, BSLeft, lc, style->color(), ls,
+                   ignore_top ? 0 : style->borderTopWidth(), ignore_bottom ? 0 : style->borderBottomWidth());
+
+        if (renderRadii && (!upperLeftBorderStylesMatch || !lowerLeftBorderStylesMatch)) {
+            int topX = tx;
+            thickness = style->borderLeftWidth() * 2;
+
+            if (!upperLeftBorderStylesMatch && topLeft.width()) {
+                int topY = ty;
+                bool applyTopInnerClip = (style->borderLeftWidth() < topLeft.width())
+                    && (style->borderTopWidth() < topLeft.height())
+                    && (ls != DOUBLE || style->borderLeftWidth() > 6);
+                if (applyTopInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, topY, topLeft.width() * 2, topLeft.height() * 2),
+                                                             style->borderLeftWidth());
+                }
+
+                firstAngleStart = 135;
+                firstAngleSpan = 45;
+
+                // Draw top left arc
+                drawBorderArc(graphicsContext, topX, topY, thickness, topLeft, firstAngleStart, firstAngleSpan,
+                              BSLeft, lc, style->color(), ls, true);
+                if (applyTopInnerClip)
+                    graphicsContext->restore();
+            }
+
+            if (!lowerLeftBorderStylesMatch && bottomLeft.width()) {
+                int bottomY = ty + h - bottomLeft.height() * 2;
+                bool applyBottomInnerClip = (style->borderLeftWidth() < bottomLeft.width())
+                    && (style->borderBottomWidth() < bottomLeft.height())
+                    && (ls != DOUBLE || style->borderLeftWidth() > 6);
+                if (applyBottomInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, bottomY, bottomLeft.width() * 2, bottomLeft.height() * 2),
+                                                             style->borderLeftWidth());
+                }
+
+                secondAngleStart = 180;
+                secondAngleSpan = 45;
+
+                // Draw bottom left arc
+                drawBorderArc(graphicsContext, topX, bottomY, thickness, bottomLeft, secondAngleStart, secondAngleSpan,
+                              BSLeft, lc, style->color(), ls, false);
+                if (applyBottomInnerClip)
+                    graphicsContext->restore();
+            }
+        }
+    }
+
+    if (renderRight) {
+        bool ignore_top = (renderRadii && topRight.height() > 0) ||
+            ((tc == rc) && (tt == rt) &&
+            (rs >= DOTTED || rs == INSET) &&
+            (ts == DOTTED || ts == DASHED || ts == SOLID || ts == OUTSET));
+
+        bool ignore_bottom = (renderRadii && bottomRight.height() > 0) ||
+            ((bc == rc) && (bt == rt) &&
+            (rs >= DOTTED || rs == INSET) &&
+            (bs == DOTTED || bs == DASHED || bs == SOLID || bs == INSET));
+
+        int y = ty;
+        int y2 = ty + h;
+        if (renderRadii) {
+            y += topRight.height();
+            y2 -= bottomRight.height();
+        }
+
+        drawBorder(graphicsContext, tx + w - style->borderRightWidth(), y, tx + w, y2, BSRight, rc, style->color(), rs,
+                   ignore_top ? 0 : style->borderTopWidth(), ignore_bottom ? 0 : style->borderBottomWidth());
+
+        if (renderRadii && (!upperRightBorderStylesMatch || !lowerRightBorderStylesMatch)) {
+            thickness = style->borderRightWidth() * 2;
+
+            if (!upperRightBorderStylesMatch && topRight.width()) {
+                int topX = tx + w - topRight.width() * 2;
+                int topY = ty;
+                bool applyTopInnerClip = (style->borderRightWidth() < topRight.width())
+                    && (style->borderTopWidth() < topRight.height())
+                    && (rs != DOUBLE || style->borderRightWidth() > 6);
+                if (applyTopInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, topY, topRight.width() * 2, topRight.height() * 2),
+                                                             style->borderRightWidth());
+                }
+
+                firstAngleStart = 0;
+                firstAngleSpan = 45;
+
+                // Draw top right arc
+                drawBorderArc(graphicsContext, topX, topY, thickness, topRight, firstAngleStart, firstAngleSpan,
+                              BSRight, rc, style->color(), rs, true);
+                if (applyTopInnerClip)
+                    graphicsContext->restore();
+            }
+
+            if (!lowerRightBorderStylesMatch && bottomRight.width()) {
+                int bottomX = tx + w - bottomRight.width() * 2;
+                int bottomY = ty + h - bottomRight.height() * 2;
+                bool applyBottomInnerClip = (style->borderRightWidth() < bottomRight.width())
+                    && (style->borderBottomWidth() < bottomRight.height())
+                    && (rs != DOUBLE || style->borderRightWidth() > 6);
+                if (applyBottomInnerClip) {
+                    graphicsContext->save();
+                    graphicsContext->addInnerRoundedRectClip(IntRect(bottomX, bottomY, bottomRight.width() * 2, bottomRight.height() * 2),
+                                                             style->borderRightWidth());
+                }
+
+                secondAngleStart = 315;
+                secondAngleSpan = 45;
+
+                // Draw bottom right arc
+                drawBorderArc(graphicsContext, bottomX, bottomY, thickness, bottomRight, secondAngleStart, secondAngleSpan,
+                              BSRight, rc, style->color(), rs, false);
+                if (applyBottomInnerClip)
+                    graphicsContext->restore();
+            }
+        }
+    }
+
+    if (renderRadii)
+        graphicsContext->restore();
+}
+
+void RenderObject::paintBoxShadow(GraphicsContext* context, int tx, int ty, int w, int h, const RenderStyle* s, bool begin, bool end)
+{
+    if (!s->boxShadow())
+        return;
+    
+    // FIXME: Deal with border-image.  Would be great to use border-image as a mask.
+    context->save();
+    context->setShadow(IntSize(s->boxShadow()->x, s->boxShadow()->y),
+                               s->boxShadow()->blur, s->boxShadow()->color);
+    IntRect rect(tx, ty, w, h);
+    if (s->hasBorderRadius()) {
+        IntSize topLeft = begin ? s->borderTopLeftRadius() : IntSize();
+        IntSize topRight = end ? s->borderTopRightRadius() : IntSize();
+        IntSize bottomLeft = begin ? s->borderBottomLeftRadius() : IntSize();
+        IntSize bottomRight = end ? s->borderBottomRightRadius() : IntSize();
+        context->clipOutRoundedRect(rect, topLeft, topRight, bottomLeft, bottomRight);
+        context->fillRoundedRect(rect, topLeft, topRight, bottomLeft, bottomRight, Color::black);
+    } else {
+        context->clipOut(rect);
+        context->fillRect(IntRect(tx, ty, w, h), Color::black);
+    }
+    context->restore();
+}
+
+void RenderObject::addLineBoxRects(Vector<IntRect>&, unsigned startOffset, unsigned endOffset, bool useSelectionHeight)
+{
+}
+
+void RenderObject::absoluteRects(Vector<IntRect>& rects, int tx, int ty, bool topLevel)
+{
+    // For blocks inside inlines, we go ahead and include margins so that we run right up to the
+    // inline boxes above and below us (thus getting merged with them to form a single irregular
+    // shape).
+    if (topLevel && continuation()) {
+        rects.append(IntRect(tx, ty - collapsedMarginTop(),
+                             width(), height() + collapsedMarginTop() + collapsedMarginBottom()));
+        continuation()->absoluteRects(rects,
+                                      tx - xPos() + continuation()->containingBlock()->xPos(),
+                                      ty - yPos() + continuation()->containingBlock()->yPos(), topLevel);
+    } else
+        rects.append(IntRect(tx, ty, width(), height() + borderTopExtra() + borderBottomExtra()));
+}
+
+IntRect RenderObject::absoluteBoundingBoxRect()
+{
+    int x, y;
+    absolutePosition(x, y);
+    Vector<IntRect> rects;
+    absoluteRects(rects, x, y);
+
+    size_t n = rects.size();
+    if (!n)
+        return IntRect();
+
+    IntRect result = rects[0];
+    for (size_t i = 1; i < n; ++i)
+        result.unite(rects[i]);
+    return result;
+}
+
+void RenderObject::addAbsoluteRectForLayer(IntRect& result)
+{
+    if (hasLayer())
+        result.unite(absoluteBoundingBoxRect());
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
+        current->addAbsoluteRectForLayer(result);
+}
+
+IntRect RenderObject::paintingRootRect(IntRect& topLevelRect)
+{
+    IntRect result = absoluteBoundingBoxRect();
+    topLevelRect = result;
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
+        current->addAbsoluteRectForLayer(result);
+    return result;
+}
+
+void RenderObject::addPDFURLRect(GraphicsContext* graphicsContext, IntRect rect)
+{
+    Node* node = element();
+    if (node) {
+        if (graphicsContext) {
+            if (rect.width() > 0 && rect.height() > 0) {
+                Element* element = static_cast<Element*>(node);
+                String href;
+                if (element->isLink())
+                    href = element->getAttribute(hrefAttr);
+
+                if (!href.isNull()) {
+                    KURL link = element->document()->completeURL(href.deprecatedString());
+                    graphicsContext->setURLForRect(link, rect);
+                }
+            }
+        }
+    }
+}
+
+
+void RenderObject::addFocusRingRects(GraphicsContext* graphicsContext, int tx, int ty)
+{
+    // For blocks inside inlines, we go ahead and include margins so that we run right up to the
+    // inline boxes above and below us (thus getting merged with them to form a single irregular
+    // shape).
+    if (continuation()) {
+        graphicsContext->addFocusRingRect(IntRect(tx, ty - collapsedMarginTop(), width(), height() + collapsedMarginTop() + collapsedMarginBottom()));
+        continuation()->addFocusRingRects(graphicsContext,
+                                          tx - xPos() + continuation()->containingBlock()->xPos(),
+                                          ty - yPos() + continuation()->containingBlock()->yPos());
+    } else
+        graphicsContext->addFocusRingRect(IntRect(tx, ty, width(), height()));
+}
+
+void RenderObject::paintOutline(GraphicsContext* graphicsContext, int tx, int ty, int w, int h, const RenderStyle* style)
+{
+    if (!hasOutline())
+        return;
+
+    int ow = style->outlineWidth();
+
+    EBorderStyle os = style->outlineStyle();
+
+    Color oc = style->outlineColor();
+    if (!oc.isValid())
+        oc = style->color();
+
+    int offset = style->outlineOffset();
+
+    if (style->outlineStyleIsAuto() || hasOutlineAnnotation()) {
+        if (!theme()->supportsFocusRing(style)) {
+            // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
+            graphicsContext->initFocusRing(ow, offset);
+            if (style->outlineStyleIsAuto())
+                addFocusRingRects(graphicsContext, tx, ty);
+            else
+                addPDFURLRect(graphicsContext, graphicsContext->focusRingBoundingRect());
+            graphicsContext->drawFocusRing(oc);
+            graphicsContext->clearFocusRing();
+        }
+    }
+
+    if (style->outlineStyleIsAuto() || style->outlineStyle() <= BHIDDEN)
+        return;
+
+    tx -= offset;
+    ty -= offset;
+    w += 2 * offset;
+    h += 2 * offset;
+
+    if (h < 0 || w < 0)
+        return;
+
+    drawBorder(graphicsContext, tx - ow, ty - ow, tx, ty + h + ow,
+               BSLeft, Color(oc), style->color(), os, ow, ow);
+
+    drawBorder(graphicsContext, tx - ow, ty - ow, tx + w + ow, ty,
+               BSTop, Color(oc), style->color(), os, ow, ow);
+
+    drawBorder(graphicsContext, tx + w, ty - ow, tx + w + ow, ty + h + ow,
+               BSRight, Color(oc), style->color(), os, ow, ow);
+
+    drawBorder(graphicsContext, tx - ow, ty + h, tx + w + ow, ty + h + ow,
+               BSBottom, Color(oc), style->color(), os, ow, ow);
+}
+
+void RenderObject::paint(PaintInfo& /*paintInfo*/, int /*tx*/, int /*ty*/)
+{
+}
+
+void RenderObject::repaint(bool immediate)
+{
+    // Can't use view(), since we might be unrooted.
+    RenderObject* o = this;
+    while (o->parent())
+        o = o->parent();
+    if (!o->isRenderView())
+        return;
+    RenderView* view = static_cast<RenderView*>(o);
+    if (view->printing())
+        return; // Don't repaint if we're printing.
+    view->repaintViewRectangle(absoluteClippedOverflowRect(), immediate);
+}
+
+void RenderObject::repaintRectangle(const IntRect& r, bool immediate)
+{
+    // Can't use view(), since we might be unrooted.
+    RenderObject* o = this;
+    while (o->parent())
+        o = o->parent();
+    if (!o->isRenderView())
+        return;
+    RenderView* view = static_cast<RenderView*>(o);
+    if (view->printing())
+        return; // Don't repaint if we're printing.
+    IntRect absRect(r);
+    computeAbsoluteRepaintRect(absRect);
+    view->repaintViewRectangle(absRect, immediate);
+}
+
+bool RenderObject::repaintAfterLayoutIfNeeded(const IntRect& oldBounds, const IntRect& oldOutlineBox)
+{
+    RenderView* v = view();
+    if (v->printing())
+        return false; // Don't repaint if we're printing.
+
+    IntRect newBounds = absoluteClippedOverflowRect();
+    IntRect 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) {
+        newOutlineBox = absoluteOutlineBox();
+        if (newOutlineBox.location() != oldOutlineBox.location() || (mustRepaintBackgroundOrBorder() && (newBounds != oldBounds || newOutlineBox != oldOutlineBox)))
+            fullRepaint = true;
+    }
+    if (fullRepaint) {
+        v->repaintViewRectangle(oldBounds);
+        if (newBounds != oldBounds)
+            v->repaintViewRectangle(newBounds);
+        return true;
+    }
+
+    if (newBounds == oldBounds && newOutlineBox == oldOutlineBox)
+        return false;
+
+    int deltaLeft = newBounds.x() - oldBounds.x();
+    if (deltaLeft > 0)
+        v->repaintViewRectangle(IntRect(oldBounds.x(), oldBounds.y(), deltaLeft, oldBounds.height()));
+    else if (deltaLeft < 0)
+        v->repaintViewRectangle(IntRect(newBounds.x(), newBounds.y(), -deltaLeft, newBounds.height()));
+
+    int deltaRight = newBounds.right() - oldBounds.right();
+    if (deltaRight > 0)
+        v->repaintViewRectangle(IntRect(oldBounds.right(), newBounds.y(), deltaRight, newBounds.height()));
+    else if (deltaRight < 0)
+        v->repaintViewRectangle(IntRect(newBounds.right(), oldBounds.y(), -deltaRight, oldBounds.height()));
+
+    int deltaTop = newBounds.y() - oldBounds.y();
+    if (deltaTop > 0)
+        v->repaintViewRectangle(IntRect(oldBounds.x(), oldBounds.y(), oldBounds.width(), deltaTop));
+    else if (deltaTop < 0)
+        v->repaintViewRectangle(IntRect(newBounds.x(), newBounds.y(), newBounds.width(), -deltaTop));
+
+    int deltaBottom = newBounds.bottom() - oldBounds.bottom();
+    if (deltaBottom > 0)
+        v->repaintViewRectangle(IntRect(newBounds.x(), oldBounds.bottom(), newBounds.width(), deltaBottom));
+    else if (deltaBottom < 0)
+        v->repaintViewRectangle(IntRect(oldBounds.x(), newBounds.bottom(), 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 = !isInline() && continuation() ? continuation()->style() : style();
+    int ow = outlineStyle->outlineSize();
+    ShadowData* boxShadow = style()->boxShadow();
+    int width = abs(newOutlineBox.width() - oldOutlineBox.width());
+    if (width) {
+        int shadowRight = boxShadow ? max(boxShadow->x + boxShadow->blur, 0) : 0;
+        int borderWidth = max(-outlineStyle->outlineOffset(), max(borderRight(), max(style()->borderTopRightRadius().width(), style()->borderBottomRightRadius().width()))) + max(ow, shadowRight);
+        IntRect rightRect(newOutlineBox.x() + min(newOutlineBox.width(), oldOutlineBox.width()) - borderWidth,
+            newOutlineBox.y(),
+            width + borderWidth,
+            max(newOutlineBox.height(), oldOutlineBox.height()));
+        int right = min(newBounds.right(), oldBounds.right());
+        if (rightRect.x() < right) {
+            rightRect.setWidth(min(rightRect.width(), right - rightRect.x()));
+            v->repaintViewRectangle(rightRect);
+        }
+    }
+    int height = abs(newOutlineBox.height() - oldOutlineBox.height());
+    if (height) {
+        int shadowBottom = boxShadow ? max(boxShadow->y + boxShadow->blur, 0) : 0;
+        int borderHeight = max(-outlineStyle->outlineOffset(), max(borderBottom(), max(style()->borderBottomLeftRadius().height(), style()->borderBottomRightRadius().height()))) + max(ow, shadowBottom);
+        IntRect bottomRect(newOutlineBox.x(),
+            min(newOutlineBox.bottom(), oldOutlineBox.bottom()) - borderHeight,
+            max(newOutlineBox.width(), oldOutlineBox.width()),
+            height + borderHeight);
+        int bottom = min(newBounds.bottom(), oldBounds.bottom());
+        if (bottomRect.y() < bottom) {
+            bottomRect.setHeight(min(bottomRect.height(), bottom - bottomRect.y()));
+            v->repaintViewRectangle(bottomRect);
+        }
+    }
+    return false;
+}
+
+void RenderObject::repaintDuringLayoutIfMoved(const IntRect& rect)
+{
+}
+
+void RenderObject::repaintOverhangingFloats(bool paintAllDescendants)
+{
+}
+
+bool RenderObject::checkForRepaintDuringLayout() const
+{
+    return !document()->view()->needsFullRepaint() && !hasLayer();
+}
+
+IntRect RenderObject::getAbsoluteRepaintRectWithOutline(int ow)
+{
+    IntRect r(absoluteClippedOverflowRect());
+    r.inflate(ow);
+
+    if (continuation() && !isInline())
+        r.inflateY(collapsedMarginTop());
+
+    if (isInlineFlow()) {
+        for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {
+            if (!curr->isText())
+                r.unite(curr->getAbsoluteRepaintRectWithOutline(ow));
+        }
+    }
+
+    return r;
+}
+
+IntRect RenderObject::absoluteClippedOverflowRect()
+{
+    if (parent())
+        return parent()->absoluteClippedOverflowRect();
+    return IntRect();
+}
+
+void RenderObject::computeAbsoluteRepaintRect(IntRect& rect, bool fixed)
+{
+    if (RenderObject* o = parent()) {
+        if (o->isBlockFlow()) {
+            RenderBlock* cb = static_cast<RenderBlock*>(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.
+            IntRect boxRect(0, 0, o->layer()->width(), o->layer()->height());
+            int x = rect.x();
+            int y = rect.y();
+            o->layer()->subtractScrollOffset(x, y); // For overflow:auto/scroll/hidden.
+            IntRect repaintRect(x, y, rect.width(), rect.height());
+            rect = intersection(repaintRect, boxRect);
+            if (rect.isEmpty())
+                return;
+        }
+
+        o->computeAbsoluteRepaintRect(rect, fixed);
+    }
+}
+
+void RenderObject::dirtyLinesFromChangedChild(RenderObject* child)
+{
+}
+
+#ifndef NDEBUG
+
+DeprecatedString RenderObject::information() const
+{
+    DeprecatedString str;
+    TextStream ts(&str);
+    ts << renderName()
+       << "(" << (style() ? style()->refCount() : 0) << ")"
+       << ": " << (void*)this << "  ";
+    if (isInline())
+        ts << "il ";
+    if (childrenInline())
+        ts << "ci ";
+    if (isFloating())
+        ts << "fl ";
+    if (isAnonymous())
+        ts << "an ";
+    if (isRelPositioned())
+        ts << "rp ";
+    if (isPositioned())
+        ts << "ps ";
+    if (needsLayout())
+        ts << "nl ";
+    if (style() && style()->zIndex())
+        ts << "zI: " << style()->zIndex();
+    if (element()) {
+        if (element()->active())
+            ts << "act ";
+        if (element()->isLink())
+            ts << "anchor ";
+        if (element()->focused())
+            ts << "focus ";
+        ts << " <" << element()->localName().deprecatedString() << ">";
+        ts << " (" << xPos() << "," << yPos() << "," << width() << "," << height() << ")";
+        if (isTableCell()) {
+            const RenderTableCell* cell = static_cast<const RenderTableCell*>(this);
+            ts << " [r=" << cell->row() << " c=" << cell->col() << " rs=" << cell->rowSpan() << " cs=" << cell->colSpan() << "]";
+        }
+    }
+    return str;
+}
+
+void RenderObject::dump(TextStream* stream, DeprecatedString ind) const
+{
+    if (isAnonymous())
+        *stream << " anonymous";
+    if (isFloating())
+        *stream << " floating";
+    if (isPositioned())
+        *stream << " positioned";
+    if (isRelPositioned())
+        *stream << " relPositioned";
+    if (isText())
+        *stream << " text";
+    if (isInline())
+        *stream << " inline";
+    if (isReplaced())
+        *stream << " replaced";
+    if (hasBoxDecorations())
+        *stream << " paintBackground";
+    if (needsLayout())
+        *stream << " needsLayout";
+    if (prefWidthsDirty())
+        *stream << " prefWidthsDirty";
+    *stream << endl;
+
+    RenderObject* child = firstChild();
+    while (child) {
+        *stream << ind << child->renderName() << ": ";
+        child->dump(stream, ind + "  ");
+        child = child->nextSibling();
+    }
+}
+
+void RenderObject::showTreeForThis() const
+{
+    if (element())
+        element()->showTreeForThis();
+}
+
+#endif // NDEBUG
+
+Color RenderObject::selectionBackgroundColor() const
+{
+    Color color;
+    if (style()->userSelect() != SELECT_NONE) {
+        RenderStyle* pseudoStyle = getPseudoStyle(RenderStyle::SELECTION);
+        if (pseudoStyle && pseudoStyle->backgroundColor().isValid())
+            color = pseudoStyle->backgroundColor().blendWithWhite();
+        else
+            color = document()->frame()->selectionController()->isFocusedAndActive() ?
+                    theme()->activeSelectionBackgroundColor() :
+                    theme()->inactiveSelectionBackgroundColor();
+    }
+
+    return color;
+}
+
+Color RenderObject::selectionForegroundColor() const
+{
+    Color color;
+    if (style()->userSelect() != SELECT_NONE) {
+        RenderStyle* pseudoStyle = getPseudoStyle(RenderStyle::SELECTION);
+        if (pseudoStyle) {
+            color = pseudoStyle->textFillColor();
+            if (!color.isValid())
+                color = pseudoStyle->color();
+        } else
+            color = document()->frame()->selectionController()->isFocusedAndActive() ?
+                    theme()->platformActiveSelectionForegroundColor() :
+                    theme()->platformInactiveSelectionForegroundColor();
+    }
+
+    return color;
+}
+
+Node* RenderObject::draggableNode(bool dhtmlOK, bool uaOK, int x, int y, bool& dhtmlWillDrag) const
+{
+    if (!dhtmlOK && !uaOK)
+        return 0;
+
+    for (const RenderObject* curr = this; curr; curr = curr->parent()) {
+        Node* elt = curr->element();
+        if (elt && elt->nodeType() == Node::TEXT_NODE) {
+            // Since there's no way for the author to address the -webkit-user-drag style for a text node,
+            // we use our own judgement.
+            if (uaOK && view()->frameView()->frame()->eventHandler()->shouldDragAutoNode(curr->node(), IntPoint(x, y))) {
+                dhtmlWillDrag = false;
+                return curr->node();
+            }
+            if (elt->canStartSelection())
+                // In this case we have a click in the unselected portion of text.  If this text is
+                // selectable, we want to start the selection process instead of looking for a parent
+                // to try to drag.
+                return 0;
+        } else {
+            EUserDrag dragMode = curr->style()->userDrag();
+            if (dhtmlOK && dragMode == DRAG_ELEMENT) {
+                dhtmlWillDrag = true;
+                return curr->node();
+            }
+            if (uaOK && dragMode == DRAG_AUTO
+                    && view()->frameView()->frame()->eventHandler()->shouldDragAutoNode(curr->node(), IntPoint(x, y))) {
+                dhtmlWillDrag = false;
+                return curr->node();
+            }
+        }
+    }
+    return 0;
+}
+
+void RenderObject::selectionStartEnd(int& spos, int& epos) const
+{
+    view()->selectionStartEnd(spos, epos);
+}
+
+RenderBlock* RenderObject::createAnonymousBlock()
+{
+    RenderStyle* newStyle = new (renderArena()) RenderStyle();
+    newStyle->inheritFrom(m_style);
+    newStyle->setDisplay(BLOCK);
+
+    RenderBlock* newBox = new (renderArena()) RenderBlock(document() /* anonymous box */);
+    newBox->setStyle(newStyle);
+    return newBox;
+}
+
+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()) {
+            if (parent()->isRenderInline()) {
+                // We have to split the parent flow.
+                RenderInline* parentInline = static_cast<RenderInline*>(parent());
+                RenderBlock* newBox = parentInline->createAnonymousBlock();
+
+                RenderFlow* oldContinuation = parent()->continuation();
+                parentInline->setContinuation(newBox);
+
+                RenderObject* beforeChild = nextSibling();
+                parent()->removeChildNode(this);
+                parentInline->splitFlow(beforeChild, newBox, this, oldContinuation);
+            } else if (parent()->isRenderBlock()) {
+                RenderBlock* o = static_cast<RenderBlock*>(parent());
+                o->makeChildrenNonInline();
+                if (o->isAnonymousBlock() && o->parent())
+                    o->parent()->removeLeftoverAnonymousBlock(o);
+                // o may be dead here
+            }
+        } else {
+            // An anonymous block must be made to wrap this inline.
+            RenderBlock* box = createAnonymousBlock();
+            parent()->insertChildNode(box, this);
+            box->appendChildNode(parent()->removeChildNode(this));
+        }
+    }
+}
+
+void RenderObject::setAnimatableStyle(RenderStyle* style)
+{
+    if (!isText() && m_style && style) {
+        if (!m_style->transitions())
+            animationController()->cancelImplicitAnimations(this);
+        else
+            style = animationController()->updateImplicitAnimations(this, style);
+    }
+    setStyle(style);
+}
+
+void RenderObject::setStyle(RenderStyle* style)
+{
+    if (m_style == style)
+        return;
+
+    bool affectsParentBlock = false;
+    RenderStyle::Diff d = RenderStyle::Equal;
+    if (m_style) {
+        d = m_style->diff(style);
+
+        // If our z-index changes value or our visibility changes,
+        // we need to dirty our stacking context's z-order list.
+        if (style) {
+            if (m_style->visibility() != style->visibility() ||
+                    m_style->zIndex() != style->zIndex() ||
+                    m_style->hasAutoZIndex() != style->hasAutoZIndex())
+                document()->setDashboardRegionsDirty(true);
+
+            if ((m_style->hasAutoZIndex() != style->hasAutoZIndex() ||
+                    m_style->zIndex() != style->zIndex() ||
+                    m_style->visibility() != style->visibility()) && hasLayer()) {
+                layer()->stackingContext()->dirtyZOrderLists();
+                if (m_style->hasAutoZIndex() != style->hasAutoZIndex() ||
+                        m_style->visibility() != style->visibility())
+                    layer()->dirtyZOrderLists();
+            }
+            // keep layer hierarchy visibility bits up to date if visibility changes
+            if (m_style->visibility() != style->visibility()) {
+                if (RenderLayer* l = enclosingLayer()) {
+                    if (style->visibility() == VISIBLE)
+                        l->setHasVisibleContent(true);
+                    else if (l->hasVisibleContent() && (this == l->renderer() || l->renderer()->style()->visibility() != VISIBLE)) {
+                        l->dirtyVisibleContentStatus();
+                        if (d > RenderStyle::RepaintLayer)
+                            repaint();
+                    }
+                }
+            }
+        }
+
+        // If we have no layer(), just treat a RepaintLayer hint as a normal Repaint.
+        if (d == RenderStyle::RepaintLayer && !hasLayer())
+            d = RenderStyle::Repaint;
+
+        // The background of the root element or the body element could propagate up to
+        // the canvas.  Just dirty the entire canvas when our style changes substantially.
+        if (d >= RenderStyle::Repaint && element() &&
+                (element()->hasTagName(htmlTag) || element()->hasTagName(bodyTag)))
+            view()->repaint();
+        else if (m_parent && !isText()) {
+            // Do a repaint with the old style first, e.g., for example if we go from
+            // having an outline to not having an outline.
+            if (d == RenderStyle::RepaintLayer) {
+                layer()->repaintIncludingDescendants();
+                if (!(m_style->clip() == style->clip()))
+                    layer()->clearClipRects();
+            } else if (d == RenderStyle::Repaint || style->outlineSize() < m_style->outlineSize())
+                repaint();
+        }
+
+        // When a layout hint happens, we go ahead and do a repaint of the layer, since the layer could
+        // end up being destroyed.
+        if (d == RenderStyle::Layout && hasLayer() &&
+                (m_style->position() != style->position() ||
+                 m_style->zIndex() != style->zIndex() ||
+                 m_style->hasAutoZIndex() != style->hasAutoZIndex() ||
+                 !(m_style->clip() == style->clip()) ||
+                 m_style->hasClip() != style->hasClip() ||
+                 m_style->opacity() != style->opacity()))
+            layer()->repaintIncludingDescendants();
+
+        // When a layout hint happens and an object's position style changes, we have to do a layout
+        // to dirty the render tree using the old position value now.
+        if (d == RenderStyle::Layout && m_parent && m_style->position() != style->position()) {
+            markContainingBlocksForLayout();
+            if (m_style->position() == StaticPosition)
+                repaint();
+            if (isRenderBlock()) {
+                if (style->position() == StaticPosition)
+                    // Clear our positioned objects list. Our absolutely positioned descendants will be
+                    // inserted into our containing block's positioned objects list during layout.
+                    removePositionedObjects(0);
+                else if (m_style->position() == StaticPosition) {
+                    // Remove our absolutely positioned descendants from their current containing block.
+                    // They will be inserted into our positioned objects list during layout.
+                    RenderObject* cb = parent();
+                    while (cb && (cb->style()->position() == StaticPosition || (cb->isInline() && !cb->isReplaced())) && !cb->isRenderView()) {
+                        if (cb->style()->position() == RelativePosition && cb->isInline() && !cb->isReplaced()) {
+                            cb = cb->containingBlock();
+                            break;
+                        }
+                        cb = cb->parent();
+                    }
+                    cb->removePositionedObjects(static_cast<RenderBlock*>(this));
+                }
+            }
+        }
+
+        if (isFloating() && (m_style->floating() != style->floating()))
+            // For changes in float styles, we need to conceivably remove ourselves
+            // from the floating objects list.
+            removeFromObjectLists();
+        else if (isPositioned() && (style->position() != AbsolutePosition && style->position() != FixedPosition))
+            // For changes in positioning styles, we need to conceivably remove ourselves
+            // from the positioned objects list.
+            removeFromObjectLists();
+
+        affectsParentBlock = m_style && isFloatingOrPositioned() &&
+            (!style->isFloating() && style->position() != AbsolutePosition && style->position() != FixedPosition)
+            && parent() && (parent()->isBlockFlow() || parent()->isInlineFlow());
+
+        // reset style flags
+        if (d == RenderStyle::Layout) {
+            m_floating = false;
+            m_positioned = false;
+            m_relPositioned = false;
+        }
+        m_paintBackground = false;
+        m_hasOverflowClip = false;
+        m_hasTransform = false;
+    }
+
+    if (view()->frameView()) {
+        // FIXME: A better solution would be to only invalidate the fixed regions when scrolling.  It's overkill to
+        // prevent the entire view from blitting on a scroll.
+        bool newStyleSlowScroll = style && (style->position() == FixedPosition || style->hasFixedBackgroundImage());
+        bool oldStyleSlowScroll = m_style && (m_style->position() == FixedPosition || m_style->hasFixedBackgroundImage());
+        if (oldStyleSlowScroll != newStyleSlowScroll) {
+            if (oldStyleSlowScroll)
+                view()->frameView()->removeSlowRepaintObject();
+            if (newStyleSlowScroll)
+                view()->frameView()->addSlowRepaintObject();
+        }
+    }
+
+    RenderStyle* oldStyle = m_style;
+    m_style = style;
+
+    updateBackgroundImages(oldStyle);
+
+    if (m_style)
+        m_style->ref();
+
+    if (oldStyle)
+        oldStyle->deref(renderArena());
+
+    setHasBoxDecorations(m_style->hasBorder() || m_style->hasBackground() || m_style->hasAppearance() || m_style->boxShadow());
+
+    if (affectsParentBlock)
+        handleDynamicFloatPositionChange();
+
+    // No need to ever schedule repaints from a style change of a text run, since
+    // we already did this for the parent of the text run.
+    // We do have to schedule layouts, though, since a style change can force us to
+    // need to relayout.
+    if (d == RenderStyle::Layout && m_parent)
+        setNeedsLayoutAndPrefWidthsRecalc();
+    else if (m_parent && !isText() && (d == RenderStyle::RepaintLayer || d == RenderStyle::Repaint))
+        // 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(RenderStyle* style)
+{
+    if (m_style == style)
+        return;
+    if (m_style)
+        m_style->deref(renderArena());
+    m_style = style;
+    if (m_style)
+        m_style->ref();
+}
+
+void RenderObject::updateBackgroundImages(RenderStyle* oldStyle)
+{
+    // FIXME: This will be slow when a large number of images is used.  Fix by using a dict.
+    const BackgroundLayer* oldLayers = oldStyle ? oldStyle->backgroundLayers() : 0;
+    const BackgroundLayer* newLayers = m_style ? m_style->backgroundLayers() : 0;
+    for (const BackgroundLayer* currOld = oldLayers; currOld; currOld = currOld->next()) {
+        if (currOld->backgroundImage() && (!newLayers || !newLayers->containsImage(currOld->backgroundImage())))
+            currOld->backgroundImage()->deref(this);
+    }
+    for (const BackgroundLayer* currNew = newLayers; currNew; currNew = currNew->next()) {
+        if (currNew->backgroundImage() && (!oldLayers || !oldLayers->containsImage(currNew->backgroundImage())))
+            currNew->backgroundImage()->ref(this);
+    }
+
+    CachedImage* oldBorderImage = oldStyle ? oldStyle->borderImage().image() : 0;
+    CachedImage* newBorderImage = m_style ? m_style->borderImage().image() : 0;
+    if (oldBorderImage != newBorderImage) {
+        if (oldBorderImage)
+            oldBorderImage->deref(this);
+        if (newBorderImage)
+            newBorderImage->ref(this);
+    }
+}
+
+IntRect RenderObject::viewRect() const
+{
+    return view()->viewRect();
+}
+
+bool RenderObject::absolutePosition(int& xPos, int& yPos, bool f) const
+{
+    RenderObject* o = parent();
+    if (o) {
+        o->absolutePosition(xPos, yPos, f);
+        yPos += o->borderTopExtra();
+        if (o->hasOverflowClip())
+            o->layer()->subtractScrollOffset(xPos, yPos);
+        return true;
+    } else {
+        xPos = yPos = 0;
+        return false;
+    }
+}
+
+IntRect RenderObject::caretRect(int offset, EAffinity affinity, int* extraWidthToEndOfLine)
+{
+   if (extraWidthToEndOfLine)
+       *extraWidthToEndOfLine = 0;
+
+    return IntRect();
+}
+
+int RenderObject::paddingTop() const
+{
+    int w = 0;
+    Length padding = m_style->paddingTop();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderObject::paddingBottom() const
+{
+    int w = 0;
+    Length padding = style()->paddingBottom();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderObject::paddingLeft() const
+{
+    int w = 0;
+    Length padding = style()->paddingLeft();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderObject::paddingRight() const
+{
+    int w = 0;
+    Length padding = style()->paddingRight();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+RenderView* RenderObject::view() const
+{
+    return static_cast<RenderView*>(document()->renderer());
+}
+
+bool RenderObject::hasOutlineAnnotation() const
+{
+    return element() && element()->isLink() && document()->printing();
+}
+
+RenderObject* RenderObject::container() const
+{
+    // 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 calcAbsoluteHorizontal and
+    // calcAbsoluteVertical 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).
+        while (o && o->parent() && !o->hasTransform())
+            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 = o->parent();
+    }
+
+    return o;
+}
+
+// This code has been written to anticipate the addition of CSS3-::outside and ::inside generated
+// content (and perhaps XBL).  That's why it uses the render tree and not the DOM tree.
+RenderObject* RenderObject::hoverAncestor() const
+{
+    return (!isInline() && continuation()) ? continuation() : parent();
+}
+
+bool RenderObject::isSelectionBorder() const
+{
+    SelectionState st = selectionState();
+    return st == SelectionStart || st == SelectionEnd || st == SelectionBoth;
+}
+
+void RenderObject::removeFromObjectLists()
+{
+    if (documentBeingDestroyed())
+        return;
+
+    if (isFloating()) {
+        RenderBlock* outermostBlock = containingBlock();
+        for (RenderBlock* p = outermostBlock; p && !p->isRenderView(); p = p->containingBlock()) {
+            if (p->containsFloat(this))
+                outermostBlock = p;
+        }
+
+        if (outermostBlock)
+            outermostBlock->markAllDescendantsWithFloatsForLayout(this);
+    }
+
+    if (isPositioned()) {
+        RenderObject* p;
+        for (p = parent(); p; p = p->parent()) {
+            if (p->isRenderBlock())
+                static_cast<RenderBlock*>(p)->removePositionedObject(this);
+        }
+    }
+}
+
+bool RenderObject::documentBeingDestroyed() const
+{
+    return !document()->renderer();
+}
+
+void RenderObject::destroy()
+{
+    // If this renderer is being autoscrolled, stop the autoscroll timer
+    if (document()->frame() && document()->frame()->eventHandler()->autoscrollRenderer() == this)
+        document()->frame()->eventHandler()->stopAutoscrollTimer(true);
+
+    if (m_hasCounterNodeMap)
+        RenderCounter::destroyCounterNodes(this);
+
+    if (AXObjectCache::accessibilityEnabled())
+        document()->axObjectCache()->remove(this);
+
+    animationController()->cancelImplicitAnimations(this);
+
+    // By default no ref-counting. RenderWidget::destroy() doesn't call
+    // this function because it needs to do ref-counting. If anything
+    // in this function changes, be sure to fix RenderWidget::destroy() as well.
+
+    remove();
+
+    RenderArena* arena = renderArena();
+
+    if (hasLayer())
+        layer()->destroy(arena);
+
+    arenaDelete(arena, this);
+}
+
+void RenderObject::arenaDelete(RenderArena* arena, void* base)
+{
+    if (m_style) {
+        for (const BackgroundLayer* bgLayer = m_style->backgroundLayers(); bgLayer; bgLayer = bgLayer->next()) {
+            if (CachedImage* backgroundImage = bgLayer->backgroundImage())
+                backgroundImage->deref(this);
+        }
+
+        if (CachedImage* borderImage = m_style->borderImage().image())
+            borderImage->deref(this);
+
+        m_style->deref(arena);
+    }
+
+#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::positionForCoordinates(int x, int y)
+{
+    return VisiblePosition(element(), caretMinOffset(), DOWNSTREAM);
+}
+
+void RenderObject::updateDragState(bool dragOn)
+{
+    bool valueChanged = (dragOn != m_isDragging);
+    m_isDragging = dragOn;
+    if (valueChanged && style()->affectedByDragRules())
+        element()->setChanged();
+    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
+        curr->updateDragState(dragOn);
+    if (continuation())
+        continuation()->updateDragState(dragOn);
+}
+
+bool RenderObject::hitTest(const HitTestRequest& request, HitTestResult& result, const IntPoint& point, int tx, int ty, HitTestFilter hitTestFilter)
+{
+    bool inside = false;
+    if (hitTestFilter != HitTestSelf) {
+        // First test the foreground layer (lines and inlines).
+        inside = nodeAtPoint(request, result, point.x(), point.y(), tx, ty, HitTestForeground);
+
+        // Test floats next.
+        if (!inside)
+            inside = nodeAtPoint(request, result, point.x(), point.y(), tx, ty, HitTestFloat);
+
+        // Finally test to see if the mouse is in the background (within a child block's background).
+        if (!inside)
+            inside = nodeAtPoint(request, result, point.x(), point.y(), tx, ty, HitTestChildBlockBackgrounds);
+    }
+
+    // See if the mouse is inside us but not any of our descendants
+    if (hitTestFilter != HitTestDescendants && !inside)
+        inside = nodeAtPoint(request, result, point.x(), point.y(), tx, ty, HitTestBlockBackground);
+
+    return inside;
+}
+
+void RenderObject::updateHitTestResult(HitTestResult& result, const IntPoint& point)
+{
+    if (result.innerNode())
+        return;
+
+    Node* node = element();
+    IntPoint localPoint(point);
+    if (isRenderView())
+        node = document()->documentElement();
+    else if (!isInline() && continuation())
+        // We are in the margins of block elements that are part of a continuation.  In
+        // this case we're actually still inside the enclosing inline element that was
+        // split.  Go ahead and set our inner node accordingly.
+        node = continuation()->element();
+
+    if (node) {
+        if (node->renderer() && node->renderer()->continuation() && node->renderer() != this) {
+            // We're in the continuation of a split inline.  Adjust our local point to be in the coordinate space
+            // of the principal renderer's containing block.  This will end up being the innerNonSharedNode.
+            RenderObject* firstBlock = node->renderer()->containingBlock();
+            
+            // Get our containing block.
+            RenderObject* block = this;
+            if (isInline())
+                block = containingBlock();
+        
+            localPoint.move(block->xPos() - firstBlock->xPos(), block->yPos() - firstBlock->yPos());
+        }
+
+        result.setInnerNode(node);
+        if (!result.innerNonSharedNode())
+            result.setInnerNonSharedNode(node);
+        result.setLocalPoint(localPoint);
+    }
+}
+
+bool RenderObject::nodeAtPoint(const HitTestRequest&, HitTestResult&, int /*x*/, int /*y*/, int /*tx*/, int /*ty*/, HitTestAction)
+{
+    return false;
+}
+
+short RenderObject::verticalPositionHint(bool firstLine) const
+{
+    if (firstLine) // We're only really a first-line style if the document actually uses first-line rules.
+        firstLine = document()->usesFirstLineRules();
+    short vpos = m_verticalPosition;
+    if (m_verticalPosition == PositionUndefined || firstLine) {
+        vpos = getVerticalPosition(firstLine);
+        if (!firstLine)
+            m_verticalPosition = vpos;
+    }
+
+    return vpos;
+}
+
+short RenderObject::getVerticalPosition(bool firstLine) const
+{
+    if (!isInline())
+        return 0;
+
+    // This method determines the vertical position for inline elements.
+    int vpos = 0;
+    EVerticalAlign va = style()->verticalAlign();
+    if (va == TOP)
+        vpos = PositionTop;
+    else if (va == BOTTOM)
+        vpos = PositionBottom;
+    else {
+        bool checkParent = parent()->isInline() && !parent()->isInlineBlockOrInlineTable() && parent()->style()->verticalAlign() != TOP && parent()->style()->verticalAlign() != BOTTOM;
+        vpos = checkParent ? parent()->verticalPositionHint(firstLine) : 0;
+        // don't allow elements nested inside text-top to have a different valignment.
+        if (va == BASELINE)
+            return vpos;
+
+        const Font& f = parent()->style(firstLine)->font();
+        int fontsize = f.pixelSize();
+
+        if (va == SUB)
+            vpos += fontsize / 5 + 1;
+        else if (va == SUPER)
+            vpos -= fontsize / 3 + 1;
+        else if (va == TEXT_TOP)
+            vpos += baselinePosition(firstLine) - f.ascent();
+        else if (va == MIDDLE)
+            vpos += -static_cast<int>(f.xHeight() / 2) - lineHeight(firstLine) / 2 + baselinePosition(firstLine);
+        else if (va == TEXT_BOTTOM) {
+            vpos += f.descent();
+            if (!isReplaced())
+                vpos -= style(firstLine)->font().descent();
+        } else if (va == BASELINE_MIDDLE)
+            vpos += -lineHeight(firstLine) / 2 + baselinePosition(firstLine);
+        else if (va == LENGTH)
+            vpos -= style()->verticalAlignLength().calcValue(lineHeight(firstLine));
+    }
+
+    return vpos;
+}
+
+short RenderObject::lineHeight(bool firstLine, bool /*isRootLineBox*/) const
+{
+    RenderStyle* s = style(firstLine);
+
+    Length lh = s->lineHeight();
+
+    // its "unset", choose nice default
+    if (lh.isNegative())
+        return s->font().lineSpacing();
+
+    if (lh.isPercent())
+        return lh.calcMinValue(s->fontSize());
+
+    // its fixed
+    return lh.value();
+}
+
+short RenderObject::baselinePosition(bool firstLine, bool isRootLineBox) const
+{
+    const Font& f = style(firstLine)->font();
+    return f.ascent() + (lineHeight(firstLine, isRootLineBox) - f.height()) / 2;
+}
+
+void RenderObject::scheduleRelayout()
+{
+    if (isRenderView()) {
+        FrameView* view = static_cast<RenderView*>(this)->frameView();
+        if (view)
+            view->scheduleRelayout();
+    } else if (parent()) {
+        FrameView* v = view() ? view()->frameView() : 0;
+        if (v)
+            v->scheduleRelayoutOfSubtree(this);
+    }
+}
+
+void RenderObject::removeLeftoverAnonymousBlock(RenderBlock*)
+{
+}
+
+InlineBox* RenderObject::createInlineBox(bool, bool isRootLineBox, bool)
+{
+    ASSERT(!isRootLineBox);
+    return new (renderArena()) InlineBox(this);
+}
+
+void RenderObject::dirtyLineBoxes(bool, bool)
+{
+}
+
+InlineBox* RenderObject::inlineBoxWrapper() const
+{
+    return 0;
+}
+
+void RenderObject::setInlineBoxWrapper(InlineBox*)
+{
+}
+
+void RenderObject::deleteLineBoxWrapper()
+{
+}
+
+RenderStyle* RenderObject::firstLineStyle() const
+{
+    if (!document()->usesFirstLineRules())
+        return m_style;
+
+    RenderStyle* s = m_style;
+    const RenderObject* obj = isText() ? parent() : this;
+    if (obj->isBlockFlow()) {
+        RenderBlock* firstLineBlock = obj->firstLineBlock();
+        if (firstLineBlock)
+            s = firstLineBlock->getPseudoStyle(RenderStyle::FIRST_LINE, style());
+    } else if (!obj->isAnonymous() && obj->isInlineFlow()) {
+        RenderStyle* parentStyle = obj->parent()->firstLineStyle();
+        if (parentStyle != obj->parent()->style()) {
+            // A first-line style is in effect. We need to cache a first-line style
+            // for ourselves.
+            style()->setHasPseudoStyle(RenderStyle::FIRST_LINE_INHERITED);
+            s = obj->getPseudoStyle(RenderStyle::FIRST_LINE_INHERITED, parentStyle);
+        }
+    }
+    return s;
+}
+
+RenderStyle* RenderObject::getPseudoStyle(RenderStyle::PseudoId pseudo, RenderStyle* parentStyle) const
+{
+    if (pseudo < RenderStyle::FIRST_INTERNAL_PSEUDOID && !style()->hasPseudoStyle(pseudo))
+        return 0;
+
+    if (!parentStyle)
+        parentStyle = style();
+
+    RenderStyle* result = style()->getPseudoStyle(pseudo);
+    if (result)
+        return result;
+
+    Node* node = element();
+    if (node && isText())
+        node = node->parentNode();
+    if (!node)
+        return 0;
+
+    if (pseudo == RenderStyle::FIRST_LINE_INHERITED) {
+        result = document()->styleSelector()->styleForElement(static_cast<Element*>(node), parentStyle, false);
+        result->setStyleType(RenderStyle::FIRST_LINE_INHERITED);
+    } else
+        result = document()->styleSelector()->pseudoStyleForElement(pseudo, static_cast<Element*>(node), parentStyle);
+    if (result) {
+        style()->addPseudoStyle(result);
+        result->deref(document()->renderArena());
+    }
+    return result;
+}
+
+static Color decorationColor(RenderStyle* style)
+{
+    Color result;
+    if (style->textStrokeWidth() > 0) {
+        // Prefer stroke color if possible but not if it's fully transparent.
+        result = style->textStrokeColor();
+        if (!result.isValid())
+            result = style->color();
+        if (result.alpha())
+            return result;
+    }
+    
+    result = style->textFillColor();
+    if (!result.isValid())
+        result = style->color();
+    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->style());
+            }
+            if (currDecs & OVERLINE) {
+                decorations &= ~OVERLINE;
+                overline = decorationColor(curr->style());
+            }
+            if (currDecs & LINE_THROUGH) {
+                decorations &= ~LINE_THROUGH;
+                linethrough = decorationColor(curr->style());
+            }
+        }
+        curr = curr->parent();
+        if (curr && curr->isRenderBlock() && curr->continuation())
+            curr = curr->continuation();
+    } while (curr && decorations && (!quirksMode || !curr->element() ||
+                                     (!curr->element()->hasTagName(aTag) && !curr->element()->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->style());
+        if (decorations & OVERLINE)
+            overline = decorationColor(curr->style());
+        if (decorations & LINE_THROUGH)
+            linethrough = decorationColor(curr->style());
+    }
+}
+
+void RenderObject::updateWidgetPosition()
+{
+}
+
+void RenderObject::addDashboardRegions(Vector<DashboardRegionValue>& regions)
+{
+    // Convert the style regions to absolute coordinates.
+    if (style()->visibility() != VISIBLE)
+        return;
+
+    const Vector<StyleDashboardRegion>& styleRegions = style()->dashboardRegions();
+    unsigned i, count = styleRegions.size();
+    for (i = 0; i < count; i++) {
+        StyleDashboardRegion styleRegion = styleRegions[i];
+
+        int w = width();
+        int h = height();
+
+        DashboardRegionValue region;
+        region.label = styleRegion.label;
+        region.bounds = IntRect(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);
+        }
+
+        int x, y;
+        absolutePosition(x, y);
+        region.bounds.setX(x + styleRegion.offset.left.value());
+        region.bounds.setY(y + styleRegion.offset.top.value());
+
+        if (document()->frame()) {
+            float pageScaleFactor = document()->frame()->page()->chrome()->scaleFactor();
+            if (pageScaleFactor != 1.0f) {
+                region.bounds.scale(pageScaleFactor);
+                region.clip.scale(pageScaleFactor);
+            }
+        }
+
+        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);
+}
+
+bool RenderObject::avoidsFloats() const
+{
+    return isReplaced() || hasOverflowClip() || isHR();
+}
+
+bool RenderObject::shrinkToAvoidFloats() const
+{
+    // FIXME: Technically we should be able to shrink replaced elements on a line, but this is difficult to accomplish, since this
+    // involves doing a relayout during findNextLineBreak and somehow overriding the containingBlockWidth method to return the
+    // current remaining width on a line.
+    if (isInline() && !isHTMLMarquee() || !avoidsFloats())
+        return false;
+
+    // All auto-width objects that avoid floats should always use lineWidth.
+    return style()->width().isAuto();
+}
+
+UChar RenderObject::backslashAsCurrencySymbol() const
+{
+    if (Node *node = element()) {
+        if (TextResourceDecoder* decoder = node->document()->decoder())
+            return decoder->encoding().backslashAsCurrencySymbol();
+    }
+    return '\\';
+}
+
+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()->inWindow();
+}
+
+int RenderObject::maximalOutlineSize(PaintPhase p) const
+{
+    if (p != PaintPhaseOutline && p != PaintPhaseSelfOutline && p != PaintPhaseChildOutlines)
+        return 0;
+    return static_cast<RenderView*>(document()->renderer())->maximalOutlineSize();
+}
+
+int RenderObject::caretMinOffset() const
+{
+    return 0;
+}
+
+int RenderObject::caretMaxOffset() const
+{
+    if (isReplaced())
+        return element() ? max(1U, element()->childNodeCount()) : 1;
+    if (isHR())
+        return 1;
+    return 0;
+}
+
+unsigned RenderObject::caretMaxRenderedOffset() const
+{
+    return 0;
+}
+
+int RenderObject::previousOffset(int current) const
+{
+    return current - 1;
+}
+
+int RenderObject::nextOffset(int current) const
+{
+    return current + 1;
+}
+
+InlineBox* RenderObject::inlineBox(int offset, EAffinity affinity)
+{
+    return inlineBoxWrapper();
+}
+
+int RenderObject::maxTopMargin(bool positive) const
+{
+    return positive ? max(0, marginTop()) : -min(0, marginTop());
+}
+
+int RenderObject::maxBottomMargin(bool positive) const
+{
+    return positive ? max(0, marginBottom()) : -min(0, marginBottom());
+}
+
+IntRect RenderObject::contentBox() const
+{
+    return IntRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(),
+        contentWidth(), contentHeight());
+}
+
+IntRect RenderObject::absoluteContentBox() const
+{
+    IntRect rect = contentBox();
+    int x, y;
+    absolutePositionForContent(x, y);
+    rect.move(x, y);
+    return rect;
+}
+
+void RenderObject::adjustRectForOutlineAndShadow(IntRect& rect) const
+{
+    int outlineSize = !isInline() && continuation() ? continuation()->style()->outlineSize() : style()->outlineSize();
+    if (ShadowData* boxShadow = style()->boxShadow()) {
+        int shadowLeft = min(boxShadow->x - boxShadow->blur - outlineSize, 0);
+        int shadowRight = max(boxShadow->x + boxShadow->blur + outlineSize, 0);
+        int shadowTop = min(boxShadow->y - boxShadow->blur - outlineSize, 0);
+        int shadowBottom = max(boxShadow->y + boxShadow->blur + outlineSize, 0);
+        rect.move(shadowLeft, shadowTop);
+        rect.setWidth(rect.width() - shadowLeft + shadowRight);
+        rect.setHeight(rect.height() - shadowTop + shadowBottom);
+    } else
+        rect.inflate(outlineSize);
+}
+
+IntRect RenderObject::absoluteOutlineBox() const
+{
+    IntRect box = borderBox();
+    int x, y;
+    absolutePosition(x, y);
+    box.move(x, y);
+    box.move(view()->layoutDelta());
+    adjustRectForOutlineAndShadow(box);
+    return box;
+}
+
+bool RenderObject::isScrollable() const
+{
+    RenderLayer* l = enclosingLayer();
+    return l && (l->verticalScrollbar() || l->horizontalScrollbar());
+}
+
+AnimationController* RenderObject::animationController() const
+{
+    return document()->frame()->animationController();
+}
+
+#if ENABLE(SVG)
+
+FloatRect RenderObject::relativeBBox(bool) const
+{
+    return FloatRect();
+}
+
+AffineTransform RenderObject::localTransform() const
+{
+    return AffineTransform(1, 0, 0, 1, xPos(), yPos());
+}
+
+AffineTransform RenderObject::absoluteTransform() const
+{
+    if (parent())
+        return localTransform() * parent()->absoluteTransform();
+    return localTransform();
+}
+
+#endif // ENABLE(SVG)
+
+} // namespace WebCore
+
+#ifndef NDEBUG
+
+void showTree(const WebCore::RenderObject* ro)
+{
+    if (ro)
+        ro->showTreeForThis();
+}
+
+#endif