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 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 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 CanvasRenderingContext_h
27#define CanvasRenderingContext_h
28
29#include "GraphicsLayer.h"
30#include "HTMLCanvasElement.h"
31#include "ScriptWrappable.h"
32#include <wtf/HashSet.h>
33#include <wtf/Noncopyable.h>
34#include <wtf/text/StringHash.h>
35
36namespace WebCore {
37
38class CanvasPattern;
39class HTMLCanvasElement;
40class HTMLImageElement;
41class HTMLVideoElement;
42class URL;
43class WebGLObject;
44
45class CanvasRenderingContext : public ScriptWrappable {
46    WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED;
47public:
48    virtual ~CanvasRenderingContext() { }
49
50    void ref() { m_canvas->ref(); }
51    void deref() { m_canvas->deref(); }
52    HTMLCanvasElement* canvas() const { return m_canvas; }
53
54    virtual bool is2d() const { return false; }
55    virtual bool is3d() const { return false; }
56    virtual bool isAccelerated() const { return false; }
57
58    virtual void paintRenderingResultsToCanvas() {}
59    virtual PlatformLayer* platformLayer() const { return 0; }
60
61protected:
62    CanvasRenderingContext(HTMLCanvasElement*);
63    bool wouldTaintOrigin(const CanvasPattern*);
64    bool wouldTaintOrigin(const HTMLCanvasElement*);
65    bool wouldTaintOrigin(const HTMLImageElement*);
66    bool wouldTaintOrigin(const HTMLVideoElement*);
67    bool wouldTaintOrigin(const URL&);
68
69    template<class T> void checkOrigin(const T* arg)
70    {
71        if (wouldTaintOrigin(arg))
72            canvas()->setOriginTainted();
73    }
74    void checkOrigin(const URL&);
75
76private:
77    HTMLCanvasElement* m_canvas;
78};
79
80} // namespace WebCore
81
82#endif
83