CanvasRenderingContext.h revision cad810f21b803229eb11403f9209855525a25d57 
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 CanvasRenderingContext_h
27#define CanvasRenderingContext_h
28
29#include "GraphicsLayer.h"
30
31#include <wtf/HashSet.h>
32#include <wtf/Noncopyable.h>
33#include <wtf/text/StringHash.h>
34
35namespace WebCore {
36
37class CanvasPattern;
38class HTMLCanvasElement;
39class HTMLImageElement;
40class HTMLVideoElement;
41class KURL;
42class WebGLObject;
43
44class CanvasRenderingContext : public Noncopyable {
45public:
46    CanvasRenderingContext(HTMLCanvasElement*);
47    virtual ~CanvasRenderingContext() { }
48
49    // Ref and deref the m_canvas
50    void ref();
51    void deref();
52
53    HTMLCanvasElement* canvas() const { return m_canvas; }
54
55    virtual bool is2d() const { return false; }
56    virtual bool is3d() const { return false; }
57    virtual bool isAccelerated() const { return false; }
58
59    virtual void paintRenderingResultsToCanvas() {}
60    virtual bool paintsIntoCanvasBuffer() const { return true; }
61
62#if USE(ACCELERATED_COMPOSITING)
63    virtual PlatformLayer* platformLayer() const { return 0; }
64#endif
65
66protected:
67    void checkOrigin(const CanvasPattern*);
68    void checkOrigin(const HTMLCanvasElement*);
69    void checkOrigin(const HTMLImageElement*);
70    void checkOrigin(const HTMLVideoElement*);
71    void checkOrigin(const KURL&);
72
73private:
74    HTMLCanvasElement* m_canvas;
75    HashSet<String> m_cleanOrigins;
76};
77
78} // namespace WebCore
79
80#endif
81