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 "core/html/HTMLCanvasElement.h"
30#include "platform/heap/Handle.h"
31#include "wtf/HashSet.h"
32#include "wtf/Noncopyable.h"
33#include "wtf/text/StringHash.h"
34
35namespace blink { class WebLayer; }
36
37namespace blink {
38
39class CanvasImageSource;
40class HTMLCanvasElement;
41class KURL;
42class WebGLObject;
43
44class CanvasRenderingContext : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext> {
45    WTF_MAKE_NONCOPYABLE(CanvasRenderingContext);
46    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
47public:
48    virtual ~CanvasRenderingContext() { }
49
50#if !ENABLE(OILPAN)
51    void ref() { m_canvas->ref(); }
52    void deref() { m_canvas->deref(); }
53#endif
54
55    HTMLCanvasElement* canvas() const { return m_canvas; }
56
57    virtual bool is2d() const { return false; }
58    virtual bool is3d() const { return false; }
59    virtual bool isAccelerated() const { return false; }
60    virtual bool hasAlpha() const { return true; }
61    virtual void setIsHidden(bool) = 0;
62
63    virtual void paintRenderingResultsToCanvas() {}
64
65    virtual blink::WebLayer* platformLayer() const { return 0; }
66
67    virtual void trace(Visitor* visitor) { visitor->trace(m_canvas); }
68
69    bool wouldTaintOrigin(CanvasImageSource*);
70
71protected:
72    CanvasRenderingContext(HTMLCanvasElement*);
73
74private:
75    RawPtrWillBeMember<HTMLCanvasElement> m_canvas;
76    HashSet<String> m_cleanURLs;
77    HashSet<String> m_dirtyURLs;
78};
79
80} // namespace blink
81
82#endif
83