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 blink { 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: ~CanvasRenderingContext()48 virtual ~CanvasRenderingContext() { } 49 50 #if !ENABLE(OILPAN) ref()51 void ref() { m_canvas->ref(); } deref()52 void deref() { m_canvas->deref(); } 53 #endif 54 canvas()55 HTMLCanvasElement* canvas() const { return m_canvas; } 56 is2d()57 virtual bool is2d() const { return false; } is3d()58 virtual bool is3d() const { return false; } isAccelerated()59 virtual bool isAccelerated() const { return false; } hasAlpha()60 virtual bool hasAlpha() const { return true; } 61 virtual void setIsHidden(bool) = 0; 62 paintRenderingResultsToCanvas()63 virtual void paintRenderingResultsToCanvas() {} 64 platformLayer()65 virtual blink::WebLayer* platformLayer() const { return 0; } 66 trace(Visitor * visitor)67 virtual void trace(Visitor* visitor) { visitor->trace(m_canvas); } 68 69 bool wouldTaintOrigin(CanvasImageSource*); 70 71 protected: 72 CanvasRenderingContext(HTMLCanvasElement*); 73 74 private: 75 RawPtrWillBeMember<HTMLCanvasElement> m_canvas; 76 HashSet<String> m_cleanURLs; 77 HashSet<String> m_dirtyURLs; 78 }; 79 80 } // namespace blink 81 82 #endif 83