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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef CanvasObject_h
     27 #define CanvasObject_h
     28 
     29 #include <wtf/PassRefPtr.h>
     30 #include <wtf/RefCounted.h>
     31 
     32 #include "GraphicsContext3D.h"
     33 
     34 namespace WebCore {
     35 
     36     class WebGLRenderingContext;
     37 
     38     class CanvasObject : public RefCounted<CanvasObject> {
     39     public:
     40         virtual ~CanvasObject();
     41 
     42         Platform3DObject object() const { return m_object; }
     43         void setObject(Platform3DObject, bool shouldDeleteObject = true);
     44         void deleteObject();
     45 
     46         void detachContext()
     47         {
     48             deleteObject();
     49             m_context = 0;
     50         }
     51 
     52         WebGLRenderingContext* context() const { return m_context; }
     53 
     54     protected:
     55         CanvasObject(WebGLRenderingContext*);
     56         virtual void _deleteObject(Platform3DObject) = 0;
     57 
     58     private:
     59         Platform3DObject m_object;
     60         // The shouldDeleteObject flag indicates whether this wrapper
     61         // owns the underlying resource and should delete it when the
     62         // wrapper is unreferenced for the last time and deleted. It
     63         // is only set to false for certain objects returned from get
     64         // queries. FIXME: should consider canonicalizing all of these
     65         // objects in the future.
     66         bool m_shouldDeleteObject;
     67         WebGLRenderingContext* m_context;
     68     };
     69 
     70 } // namespace WebCore
     71 
     72 #endif // CanvasObject_h
     73