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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 1999 Antti Koivisto (koivisto@kde.org)
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* Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
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* Copyright (C) 2010, 2012 Google Inc. All rights reserved.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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#ifndef RenderLayerModelObject_h
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#define RenderLayerModelObject_h
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#include "RenderObject.h"
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class RenderLayerModelObject : public RenderObject {
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RenderLayerModelObject(Node*);
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virtual ~RenderLayerModelObject();
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// Called by RenderObject::willBeDestroyed() and is the only way layers should ever be destroyed
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bool hasSelfPaintingLayer() const;
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RenderLayer* layer() const { return m_layer; }
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virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
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virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
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virtual void updateFromStyle() { }
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virtual bool requiresLayer() const = 0;
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virtual void willBeDestroyed() OVERRIDE;
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virtual bool isLayerModelObject() const OVERRIDE { return true; }
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// Used to store state between styleWillChange and styleDidChange
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static bool s_wasFloating;
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static bool s_hadLayer;
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static bool s_hadTransform;
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static bool s_layerWasSelfPainting;
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inline RenderLayerModelObject* toRenderLayerModelObject(RenderObject* object)
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ASSERT(!object || object->isLayerModelObject());
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return static_cast<RenderLayerModelObject*>(object);
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inline const RenderLayerModelObject* toRenderLayerModelObject(const RenderObject* object)
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ASSERT(!object || object->isLayerModelObject());
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return static_cast<const RenderLayerModelObject*>(object);
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// This will catch anyone doing an unnecessary cast.
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void toRenderLayerModelObject(const RenderLayerModelObject*);
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} // namespace WebCore
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#endif // RenderLayerModelObject_h