2 * Copyright (C) 2009 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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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,
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26 #ifndef CanvasRenderingContext_h
27 #define CanvasRenderingContext_h
29 #include "GraphicsLayer.h"
30 #include "HTMLCanvasElement.h"
31 #include <wtf/HashSet.h>
32 #include <wtf/Noncopyable.h>
33 #include <wtf/text/StringHash.h>
38 class HTMLCanvasElement;
39 class HTMLImageElement;
40 class HTMLVideoElement;
44 class CanvasRenderingContext {
45 WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED;
47 virtual ~CanvasRenderingContext() { }
49 void ref() { m_canvas->ref(); }
50 void deref() { m_canvas->deref(); }
51 HTMLCanvasElement* canvas() const { return m_canvas; }
53 virtual bool is2d() const { return false; }
54 virtual bool is3d() const { return false; }
55 virtual bool isAccelerated() const { return false; }
57 virtual void paintRenderingResultsToCanvas() {}
58 virtual bool paintsIntoCanvasBuffer() const { return true; }
60 #if USE(ACCELERATED_COMPOSITING)
61 virtual PlatformLayer* platformLayer() const { return 0; }
65 CanvasRenderingContext(HTMLCanvasElement*);
66 bool wouldTaintOrigin(const CanvasPattern*);
67 bool wouldTaintOrigin(const HTMLCanvasElement*);
68 bool wouldTaintOrigin(const HTMLImageElement*);
69 bool wouldTaintOrigin(const HTMLVideoElement*);
70 bool wouldTaintOrigin(const KURL&);
72 template<class T> void checkOrigin(const T* arg)
74 if (wouldTaintOrigin(arg))
75 canvas()->setOriginTainted();
77 void checkOrigin(const KURL&);
80 HTMLCanvasElement* m_canvas;
81 HashSet<String> m_cleanURLs;
84 } // namespace WebCore