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 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 CSSCanvasValue_h 27 #define CSSCanvasValue_h 28 29 #include "core/css/CSSImageGeneratorValue.h" 30 #include "core/html/HTMLCanvasElement.h" 31 32 namespace WebCore { 33 34 class Document; 35 36 class CSSCanvasValue : public CSSImageGeneratorValue { 37 public: create(const String & name)38 static PassRefPtr<CSSCanvasValue> create(const String& name) { return adoptRef(new CSSCanvasValue(name)); } 39 ~CSSCanvasValue(); 40 41 String customCSSText() const; 42 43 PassRefPtr<Image> image(RenderObject*, const IntSize&); isFixedSize()44 bool isFixedSize() const { return true; } 45 IntSize fixedSize(const RenderObject*); 46 isPending()47 bool isPending() const { return false; } loadSubimages(ResourceFetcher *)48 void loadSubimages(ResourceFetcher*) { } 49 50 bool equals(const CSSCanvasValue&) const; 51 52 private: CSSCanvasValue(const String & name)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 : public CanvasObserver { 64 public: CanvasObserverProxy(CSSCanvasValue * ownerValue)65 CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { } ~CanvasObserverProxy()66 virtual ~CanvasObserverProxy() { } canvasChanged(HTMLCanvasElement * canvas,const FloatRect & changedRect)67 virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect) 68 { 69 m_ownerValue->canvasChanged(canvas, changedRect); 70 } canvasResized(HTMLCanvasElement * canvas)71 virtual void canvasResized(HTMLCanvasElement* canvas) 72 { 73 m_ownerValue->canvasResized(canvas); 74 } canvasDestroyed(HTMLCanvasElement * canvas)75 virtual void canvasDestroyed(HTMLCanvasElement* canvas) 76 { 77 m_ownerValue->canvasDestroyed(canvas); 78 } 79 private: 80 CSSCanvasValue* m_ownerValue; 81 }; 82 83 void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect); 84 void canvasResized(HTMLCanvasElement*); 85 void canvasDestroyed(HTMLCanvasElement*); 86 87 HTMLCanvasElement* element(Document*); 88 89 CanvasObserverProxy m_canvasObserver; 90 91 // The name of the canvas. 92 String m_name; 93 // The document supplies the element and owns it. 94 HTMLCanvasElement* m_element; 95 }; 96 97 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue()); 98 99 } // namespace WebCore 100 101 #endif // CSSCanvasValue_h 102