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 "GraphicsLayer.h" 30 31#include <wtf/HashSet.h> 32#include <wtf/Noncopyable.h> 33#include <wtf/text/StringHash.h> 34 35namespace WebCore { 36 37class CanvasPattern; 38class HTMLCanvasElement; 39class HTMLImageElement; 40class HTMLVideoElement; 41class KURL; 42class WebGLObject; 43 44class CanvasRenderingContext { 45 WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED; 46public: 47 CanvasRenderingContext(HTMLCanvasElement*); 48 virtual ~CanvasRenderingContext() { } 49 50 // Ref and deref the m_canvas 51 void ref(); 52 void deref(); 53 54 HTMLCanvasElement* canvas() const { return m_canvas; } 55 56 virtual bool is2d() const { return false; } 57 virtual bool is3d() const { return false; } 58 virtual bool isAccelerated() const { return false; } 59 60 virtual void paintRenderingResultsToCanvas() {} 61 virtual bool paintsIntoCanvasBuffer() const { return true; } 62 63#if USE(ACCELERATED_COMPOSITING) 64 virtual PlatformLayer* platformLayer() const { return 0; } 65#endif 66 67protected: 68 void checkOrigin(const CanvasPattern*); 69 void checkOrigin(const HTMLCanvasElement*); 70 void checkOrigin(const HTMLImageElement*); 71 void checkOrigin(const HTMLVideoElement*); 72 void checkOrigin(const KURL&); 73 74private: 75 HTMLCanvasElement* m_canvas; 76 HashSet<String> m_cleanOrigins; 77}; 78 79} // namespace WebCore 80 81#endif 82