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26 #ifndef CSSCanvasValue_h
27 #define CSSCanvasValue_h
29 #include "core/css/CSSImageGeneratorValue.h"
30 #include "core/html/HTMLCanvasElement.h"
36 class CSSCanvasValue : public CSSImageGeneratorValue {
38 static PassRefPtr<CSSCanvasValue> create(const String& name) { return adoptRef(new CSSCanvasValue(name)); }
41 String customCSSText() const;
43 PassRefPtr<Image> image(RenderObject*, const IntSize&);
44 bool isFixedSize() const { return true; }
45 IntSize fixedSize(const RenderObject*);
47 bool isPending() const { return false; }
48 void loadSubimages(ResourceFetcher*) { }
50 bool equals(const CSSCanvasValue&) const;
53 explicit CSSCanvasValue(const String& name)
54 : CSSImageGeneratorValue(CanvasClass)
55 , m_canvasObserver(this)
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 {
65 CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { }
66 virtual ~CanvasObserverProxy() { }
67 virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect)
69 m_ownerValue->canvasChanged(canvas, changedRect);
71 virtual void canvasResized(HTMLCanvasElement* canvas)
73 m_ownerValue->canvasResized(canvas);
75 virtual void canvasDestroyed(HTMLCanvasElement* canvas)
77 m_ownerValue->canvasDestroyed(canvas);
80 CSSCanvasValue* m_ownerValue;
83 void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect);
84 void canvasResized(HTMLCanvasElement*);
85 void canvasDestroyed(HTMLCanvasElement*);
87 HTMLCanvasElement* element(Document*);
89 CanvasObserverProxy m_canvasObserver;
91 // The name of the canvas.
93 // The document supplies the element and owns it.
94 HTMLCanvasElement* m_element;
97 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue());
99 } // namespace WebCore
101 #endif // CSSCanvasValue_h