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: 38 static PassRefPtrWillBeRawPtr<CSSCanvasValue> create(const String& name) 39 { 40 return adoptRefWillBeNoop(new CSSCanvasValue(name)); 41 } 42 ~CSSCanvasValue(); 43 44 String customCSSText() const; 45 46 PassRefPtr<Image> image(RenderObject*, const IntSize&); 47 bool isFixedSize() const { return true; } 48 IntSize fixedSize(const RenderObject*); 49 50 bool isPending() const { return false; } 51 void loadSubimages(ResourceFetcher*) { } 52 53 bool equals(const CSSCanvasValue&) const; 54 55 void traceAfterDispatch(Visitor*); 56 57 private: 58 explicit CSSCanvasValue(const String& name) 59 : CSSImageGeneratorValue(CanvasClass) 60 , m_canvasObserver(adoptPtrWillBeNoop(new CanvasObserverProxy(this))) 61 , m_name(name) 62 , m_element(nullptr) 63 { 64 } 65 66 // NOTE: We put the CanvasObserver in a member instead of inheriting from it 67 // to avoid adding a vptr to CSSCanvasValue. 68 class CanvasObserverProxy FINAL : public NoBaseWillBeGarbageCollected<CanvasObserverProxy>, public CanvasObserver { 69 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CanvasObserverProxy); 70 public: 71 explicit CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { } 72 73 virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect) OVERRIDE 74 { 75 m_ownerValue->canvasChanged(canvas, changedRect); 76 } 77 virtual void canvasResized(HTMLCanvasElement* canvas) OVERRIDE 78 { 79 m_ownerValue->canvasResized(canvas); 80 } 81 #if !ENABLE(OILPAN) 82 virtual void canvasDestroyed(HTMLCanvasElement* canvas) OVERRIDE 83 { 84 m_ownerValue->canvasDestroyed(canvas); 85 } 86 #endif 87 virtual void trace(Visitor* visitor) OVERRIDE 88 { 89 visitor->trace(m_ownerValue); 90 CanvasObserver::trace(visitor); 91 } 92 93 private: 94 RawPtrWillBeMember<CSSCanvasValue> m_ownerValue; 95 }; 96 97 void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect); 98 void canvasResized(HTMLCanvasElement*); 99 100 #if !ENABLE(OILPAN) 101 void canvasDestroyed(HTMLCanvasElement*); 102 #endif 103 104 HTMLCanvasElement* element(Document*); 105 106 OwnPtrWillBeMember<CanvasObserverProxy> m_canvasObserver; 107 108 // The name of the canvas. 109 String m_name; 110 // The document supplies the element and owns it. 111 RawPtrWillBeWeakMember<HTMLCanvasElement> m_element; 112 }; 113 114 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue()); 115 116 } // namespace WebCore 117 118 #endif // CSSCanvasValue_h 119