diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/canvas/CanvasObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/CanvasObject.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef CanvasObject_h
+#define CanvasObject_h
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+#include "GraphicsContext3D.h"
+
+namespace WebCore {
+
+    class WebGLRenderingContext;
+    
+    class CanvasObject : public RefCounted<CanvasObject> {
+    public:
+        virtual ~CanvasObject();
+        
+        Platform3DObject object() const { return m_object; }
+        void setObject(Platform3DObject, bool shouldDeleteObject = true);
+        void deleteObject();
+        
+        void detachContext()
+        {
+            deleteObject();
+            m_context = 0;
+        }
+
+        WebGLRenderingContext* context() const { return m_context; }
+
+        virtual bool isBuffer() const { return false; }
+        virtual bool isFramebuffer() const { return false; }
+        virtual bool isProgram() const { return false; }
+        virtual bool isRenderbuffer() const { return false; }
+        virtual bool isShader() const { return false; }
+        virtual bool isTexture() const { return false; }
+
+    protected:
+        CanvasObject(WebGLRenderingContext*);
+        virtual void _deleteObject(Platform3DObject) = 0;
+    
+    private:
+        Platform3DObject m_object;
+        // The shouldDeleteObject flag indicates whether this wrapper
+        // owns the underlying resource and should delete it when the
+        // wrapper is unreferenced for the last time and deleted. It
+        // is only set to false for certain objects returned from get
+        // queries. FIXME: should consider canonicalizing all of these
+        // objects in the future.
+        bool m_shouldDeleteObject;
+        WebGLRenderingContext* m_context;
+    };
+    
+} // namespace WebCore
+
+#endif // CanvasObject_h