WebKit merge 40668:40722 part 1.

third_party/WebKit/WebCore/rendering/RenderBoxModelObject.h

Index: third_party/WebKit/WebCore/rendering/RenderBoxModelObject.h
===================================================================
--- third_party/WebKit/WebCore/rendering/RenderBoxModelObject.h	(revision 9310)
+++ third_party/WebKit/WebCore/rendering/RenderBoxModelObject.h	(working copy)
@@ -1,36 +1,77 @@
-/*
- * Copyright (C) 2009 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.
- *
- */
-
-#ifndef RenderBoxModelObject_h
-#define RenderBoxModelObject_h
-
-#include "RenderObject.h"
-
-namespace WebCore {
-
-class RenderBoxModelObject : public RenderObject {
-public:
-    RenderBoxModelObject(Node*);
-    virtual ~RenderBoxModelObject();
-};
-
-} // namespace WebCore
-
-#endif // RenderBoxModelObject_h
+/*
+ * Copyright (C) 2009 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.
+ *
+ */
+
+#ifndef RenderBoxModelObject_h
+#define RenderBoxModelObject_h
+
+#include "RenderObject.h"
+
+namespace WebCore {
+
+// This class is the base for all objects that adhere to the CSS box model as described
+// at http://www.w3.org/TR/CSS21/box.html
+
+class RenderBoxModelObject : public RenderObject {
+public:
+    RenderBoxModelObject(Node*);
+    virtual ~RenderBoxModelObject();
+    
+    virtual void destroy();
+
+    int relativePositionOffsetX() const;
+    int relativePositionOffsetY() const;
+    IntSize relativePositionOffset() const { return IntSize(relativePositionOffsetX(), relativePositionOffsetY()); }
+
+    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
+    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
+    virtual void updateBoxModelInfoFromStyle();
+
+    RenderLayer* layer() const { return m_layer; }
+    virtual bool requiresLayer() const { return isRoot() || isPositioned() || isRelPositioned() || isTransparent() || hasOverflowClip() || hasTransform() || hasMask() || hasReflection(); }
+
+private:
+    virtual bool isBoxModelObject() const { return true; }
+
+    friend class RenderView;
+
+    RenderLayer* m_layer;
+    
+    // Used to store state between styleWillChange and styleDidChange
+    static bool s_wasFloating;
+};
+
+inline RenderBoxModelObject* toRenderBoxModelObject(RenderObject* o)
+{ 
+    ASSERT(!o || o->isBoxModelObject());
+    return static_cast<RenderBoxModelObject*>(o);
+}
+
+inline const RenderBoxModelObject* toRenderBoxModelObject(const RenderObject* o)
+{ 
+    ASSERT(!o || o->isBoxModelObject());
+    return static_cast<const RenderBoxModelObject*>(o);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toRenderBoxModelObject(const RenderBox*);
+
+} // namespace WebCore
+
+#endif // RenderBoxModelObject_h