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
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
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.
26 #ifndef CanvasRenderingContext_h
27 #define CanvasRenderingContext_h
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"
35 namespace blink { class WebLayer; }
39 class CanvasImageSource;
40 class HTMLCanvasElement;
42 class CanvasRenderingContext : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext> {
43 WTF_MAKE_NONCOPYABLE(CanvasRenderingContext);
44 WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
46 virtual ~CanvasRenderingContext() { }
49 void ref() { m_canvas->ref(); }
50 void deref() { m_canvas->deref(); }
53 HTMLCanvasElement* canvas() const { return m_canvas; }
55 virtual bool is2d() const { return false; }
56 virtual bool is3d() const { return false; }
57 virtual bool isAccelerated() const { return false; }
58 virtual bool hasAlpha() const { return true; }
59 virtual void setIsHidden(bool) = 0;
61 virtual void paintRenderingResultsToCanvas() {}
63 virtual blink::WebLayer* platformLayer() const { return nullptr; }
65 virtual void trace(Visitor* visitor) { visitor->trace(m_canvas); }
67 bool wouldTaintOrigin(CanvasImageSource*);
70 CanvasRenderingContext(HTMLCanvasElement*);
73 RawPtrWillBeMember<HTMLCanvasElement> m_canvas;
74 HashSet<String> m_cleanURLs;
75 HashSet<String> m_dirtyURLs;