Use tighter typing in table rendering code

Source/core/rendering/RenderTableRow.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
- * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2013 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.
@@ skipping 11 matching lines @@
 
 namespace WebCore {
 
 static const unsigned unsetRowIndex = 0x7FFFFFFF;
 static const unsigned maxRowIndex = 0x7FFFFFFE; // 2,147,483,646
 
 class RenderTableRow FINAL : public RenderBox {
 public:
     explicit RenderTableRow(Element*);
 
-    RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
-    RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
+    RenderTableCell* firstCell() const;
+    RenderTableCell* lastCell() const;
+
+    RenderTableRow* previousRow() const;
+    RenderTableRow* nextRow() const;
 
     const RenderObjectChildList* children() const { return &m_children; }
     RenderObjectChildList* children() { return &m_children; }
 
     RenderTableSection* section() const { return toRenderTableSection(parent()); }
     RenderTable* table() const { return toRenderTable(parent()->parent()); }
 
     void paintOutlineForRowIfNeeded(PaintInfo&, const LayoutPoint&);
 
     static RenderTableRow* createAnonymous(Document*);
@@ skipping 30 matching lines @@
     {
         if (section()->hasSameDirectionAs(table()))
             return style()->borderEnd();
 
         return style()->borderStart();
     }
 
     const BorderValue& borderAdjoiningStartCell(const RenderTableCell*) const;
     const BorderValue& borderAdjoiningEndCell(const RenderTableCell*) const;
 
+    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
+
 private:
     virtual RenderObjectChildList* virtualChildren() OVERRIDE { return children(); }
     virtual const RenderObjectChildList* virtualChildren() const OVERRIDE { return children(); }
 
     virtual const char* renderName() const OVERRIDE { return (isAnonymous() || isPseudoElement()) ? "RenderTableRow (anonymous)" : "RenderTableRow"; }
 
     virtual bool isTableRow() const OVERRIDE { return true; }
 
     virtual void willBeRemovedFromTree() OVERRIDE;
 
     virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0) OVERRIDE;
     virtual void layout() OVERRIDE;
-    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
 
     virtual LayerType layerTypeRequired() const OVERRIDE
     {
         if (hasTransform() || hasHiddenBackface() || hasClipPath() || createsGroup() || isStickyPositioned() || style()->shouldCompositeForCurrentAnimations())
             return NormalLayer;
 
         if (hasOverflowClip())
             return OverflowClipLayer;
 
         return NoLayer;
     }
 
     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
 
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE;
 
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
 
+    void nextSibling() const WTF_DELETED_FUNCTION;
+    void previousSibling() const WTF_DELETED_FUNCTION;
+
     RenderObjectChildList m_children;
     unsigned m_rowIndex : 31;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableRow, isTableRow());
 
+inline RenderTableRow* RenderTableRow::previousRow() const
+{
+    return toRenderTableRow(RenderObject::previousSibling());
+}
+
+inline RenderTableRow* RenderTableRow::nextRow() const
+{
+    return toRenderTableRow(RenderObject::nextSibling());
+}
+
+inline RenderTableRow* RenderTableSection::firstRow() const
+{
+    ASSERT(children() == virtualChildren());
+    return toRenderTableRow(children()->firstChild());
+}
+
+inline RenderTableRow* RenderTableSection::lastRow() const
+{
+    ASSERT(children() == virtualChildren());
+    return toRenderTableRow(children()->lastChild());
+}
+
 } // namespace WebCore
 
 #endif // RenderTableRow_h