Move RenderSVGResource into the inheritance hierarchy

Source/core/rendering/svg/RenderSVGResourcePaintServer.h

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. 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 RenderSVGResource_h
-#define RenderSVGResource_h
+#ifndef RenderSVGResourcePaintServer_h
+#define RenderSVGResourcePaintServer_h
 
+#include "core/rendering/svg/RenderSVGResourceContainer.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/Gradient.h"
 #include "platform/graphics/Pattern.h"
 
 namespace blink {
 
 enum RenderSVGResourceMode {
     ApplyToFillMode,
     ApplyToStrokeMode,
 };
 
 class GraphicsContext;
 class GraphicsContextStateSaver;
 class RenderObject;
-class RenderSVGResource;
+class RenderSVGResourcePaintServer;
 class RenderStyle;
 
 class SVGPaintServer {
 public:
     explicit SVGPaintServer(Color);
     explicit SVGPaintServer(PassRefPtr<Gradient>);
     explicit SVGPaintServer(PassRefPtr<Pattern>);
 
     static SVGPaintServer requestForRenderer(const RenderObject&, const RenderStyle*, RenderSVGResourceMode);
     static bool existsForRenderer(const RenderObject&, const RenderStyle*, RenderSVGResourceMode);
 
     void apply(GraphicsContext&, RenderSVGResourceMode, GraphicsContextStateSaver* = 0);
 
     static SVGPaintServer invalid() { return SVGPaintServer(Color(Color::transparent)); }
     bool isValid() const { return m_color != Color::transparent; }
 
     bool isTransformDependent() const { return m_gradient || m_pattern; }
     void prependTransform(const AffineTransform&);
 
 private:
     RefPtr<Gradient> m_gradient;
     RefPtr<Pattern> m_pattern;
     Color m_color;
 };
 
 // If |SVGPaintDescription::hasFallback| is true, |SVGPaintDescription::color| is set to a fallback color.
 struct SVGPaintDescription {
     SVGPaintDescription() : resource(nullptr), isValid(false), hasFallback(false) { }
     SVGPaintDescription(Color color) : resource(nullptr), color(color), isValid(true), hasFallback(false) { }
-    SVGPaintDescription(RenderSVGResource* resource) : resource(resource), isValid(true), hasFallback(false) { ASSERT(resource); }
-    SVGPaintDescription(RenderSVGResource* resource, Color fallbackColor) : resource(resource), color(fallbackColor), isValid(true), hasFallback(true) { ASSERT(resource); }
+    SVGPaintDescription(RenderSVGResourcePaintServer* resource) : resource(resource), isValid(true), hasFallback(false) { ASSERT(resource); }
+    SVGPaintDescription(RenderSVGResourcePaintServer* resource, Color fallbackColor) : resource(resource), color(fallbackColor), isValid(true), hasFallback(true) { ASSERT(resource); }
 
-    RenderSVGResource* resource;
+    RenderSVGResourcePaintServer* resource;
     Color color;
     bool isValid;
     bool hasFallback;
 };
 
-class RenderSVGResource {
+class RenderSVGResourcePaintServer : public RenderSVGResourceContainer {
 public:
-    RenderSVGResource() { }
-    virtual ~RenderSVGResource() { }
+    RenderSVGResourcePaintServer(SVGElement*);
+    virtual ~RenderSVGResourcePaintServer();
 
-    virtual SVGPaintServer preparePaintServer(const RenderObject&);
+    virtual SVGPaintServer preparePaintServer(const RenderObject&) = 0;
 
     // Helper utilities used in to access the underlying resources for DRT.
     static SVGPaintDescription requestPaintDescription(const RenderObject&, const RenderStyle*, RenderSVGResourceMode);
 };
 
+DEFINE_TYPE_CASTS(RenderSVGResourcePaintServer, RenderSVGResourceContainer, resource, resource->isSVGPaintServer(), resource.isSVGPaintServer());
+
 }
 
 #endif