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      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 
     35 namespace blink { class WebLayer; }
     36 
     37 namespace WebCore {
     38 
     39 class CanvasImageSource;
     40 class HTMLCanvasElement;
     41 class KURL;
     42 class WebGLObject;
     43 
     44 class CanvasRenderingContext : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext> {
     45     WTF_MAKE_NONCOPYABLE(CanvasRenderingContext);
     46     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     47 public:
     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 
     62     virtual void paintRenderingResultsToCanvas() {}
     63 
     64     virtual blink::WebLayer* platformLayer() const { return 0; }
     65 
     66     virtual void trace(Visitor* visitor) { visitor->trace(m_canvas); }
     67 
     68     bool wouldTaintOrigin(CanvasImageSource*);
     69 
     70 protected:
     71     CanvasRenderingContext(HTMLCanvasElement*);
     72 
     73 private:
     74     RawPtrWillBeMember<HTMLCanvasElement> m_canvas;
     75     HashSet<String> m_cleanURLs;
     76     HashSet<String> m_dirtyURLs;
     77 };
     78 
     79 } // namespace WebCore
     80 
     81 #endif
     82