1/* 2 * Copyright (C) 2008 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 CSSCanvasValue_h 27#define CSSCanvasValue_h 28 29#include "CSSImageGeneratorValue.h" 30#include "HTMLCanvasElement.h" 31 32namespace WebCore { 33 34class Document; 35 36class CSSCanvasValue : public CSSImageGeneratorValue { 37public: 38 static PassRef<CSSCanvasValue> create(const String& name) { return adoptRef(*new CSSCanvasValue(name)); } 39 ~CSSCanvasValue(); 40 41 String customCSSText() const; 42 43 PassRefPtr<Image> image(RenderElement*, const FloatSize&); 44 bool isFixedSize() const { return true; } 45 FloatSize fixedSize(const RenderElement*); 46 47 bool isPending() const { return false; } 48 void loadSubimages(CachedResourceLoader*) { } 49 50 bool equals(const CSSCanvasValue&) const; 51 52private: 53 explicit CSSCanvasValue(const String& name) 54 : CSSImageGeneratorValue(CanvasClass) 55 , m_canvasObserver(*this) 56 , m_name(name) 57 , m_element(0) 58 { 59 } 60 61 // NOTE: We put the CanvasObserver in a member instead of inheriting from it 62 // to avoid adding a vptr to CSSCanvasValue. 63 class CanvasObserverProxy final : public CanvasObserver { 64 public: 65 explicit CanvasObserverProxy(CSSCanvasValue& ownerValue) 66 : m_ownerValue(ownerValue) 67 { 68 } 69 70 virtual ~CanvasObserverProxy() 71 { 72 } 73 74 private: 75 virtual void canvasChanged(HTMLCanvasElement& canvas, const FloatRect& changedRect) override 76 { 77 m_ownerValue.canvasChanged(canvas, changedRect); 78 } 79 virtual void canvasResized(HTMLCanvasElement& canvas) override 80 { 81 m_ownerValue.canvasResized(canvas); 82 } 83 virtual void canvasDestroyed(HTMLCanvasElement& canvas) override 84 { 85 m_ownerValue.canvasDestroyed(canvas); 86 } 87 88 CSSCanvasValue& m_ownerValue; 89 }; 90 91 void canvasChanged(HTMLCanvasElement&, const FloatRect& changedRect); 92 void canvasResized(HTMLCanvasElement&); 93 void canvasDestroyed(HTMLCanvasElement&); 94 95 HTMLCanvasElement* element(Document&); 96 97 CanvasObserverProxy m_canvasObserver; 98 99 // The name of the canvas. 100 String m_name; 101 // The document supplies the element and owns it. 102 HTMLCanvasElement* m_element; 103}; 104 105CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue()) 106 107} // namespace WebCore 108 109#endif // CSSCanvasValue_h 110