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 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 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#include "HTMLCanvasElement.h" 31#include "ScriptWrappable.h" 32#include <wtf/HashSet.h> 33#include <wtf/Noncopyable.h> 34#include <wtf/text/StringHash.h> 35 36namespace WebCore { 37 38class CanvasPattern; 39class HTMLCanvasElement; 40class HTMLImageElement; 41class HTMLVideoElement; 42class URL; 43class WebGLObject; 44 45class CanvasRenderingContext : public ScriptWrappable { 46 WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED; 47public: 48 virtual ~CanvasRenderingContext() { } 49 50 void ref() { m_canvas->ref(); } 51 void deref() { m_canvas->deref(); } 52 HTMLCanvasElement* canvas() const { return m_canvas; } 53 54 virtual bool is2d() const { return false; } 55 virtual bool is3d() const { return false; } 56 virtual bool isAccelerated() const { return false; } 57 58 virtual void paintRenderingResultsToCanvas() {} 59 virtual PlatformLayer* platformLayer() const { return 0; } 60 61protected: 62 CanvasRenderingContext(HTMLCanvasElement*); 63 bool wouldTaintOrigin(const CanvasPattern*); 64 bool wouldTaintOrigin(const HTMLCanvasElement*); 65 bool wouldTaintOrigin(const HTMLImageElement*); 66 bool wouldTaintOrigin(const HTMLVideoElement*); 67 bool wouldTaintOrigin(const URL&); 68 69 template<class T> void checkOrigin(const T* arg) 70 { 71 if (wouldTaintOrigin(arg)) 72 canvas()->setOriginTainted(); 73 } 74 void checkOrigin(const URL&); 75 76private: 77 HTMLCanvasElement* m_canvas; 78}; 79 80} // namespace WebCore 81 82#endif 83