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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 PassRefPtrWillBeRawPtr<CSSCanvasValue> create(const String& name)
40 return adoptRefWillBeNoop(new CSSCanvasValue(name));
44 String customCSSText() const;
46 PassRefPtr<Image> image(RenderObject*, const IntSize&);
47 bool isFixedSize() const { return true; }
48 IntSize fixedSize(const RenderObject*);
50 bool isPending() const { return false; }
51 void loadSubimages(ResourceFetcher*) { }
53 bool equals(const CSSCanvasValue&) const;
55 void traceAfterDispatch(Visitor*);
58 explicit CSSCanvasValue(const String& name)
59 : CSSImageGeneratorValue(CanvasClass)
60 , m_canvasObserver(adoptPtrWillBeNoop(new CanvasObserverProxy(this)))
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);
71 explicit CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { }
73 virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect) override
75 m_ownerValue->canvasChanged(canvas, changedRect);
77 virtual void canvasResized(HTMLCanvasElement* canvas) override
79 m_ownerValue->canvasResized(canvas);
82 virtual void canvasDestroyed(HTMLCanvasElement* canvas) override
84 m_ownerValue->canvasDestroyed(canvas);
87 virtual void trace(Visitor* visitor) override
89 visitor->trace(m_ownerValue);
90 CanvasObserver::trace(visitor);
94 RawPtrWillBeMember<CSSCanvasValue> m_ownerValue;
97 void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect);
98 void canvasResized(HTMLCanvasElement*);
101 void canvasDestroyed(HTMLCanvasElement*);
104 HTMLCanvasElement* element(Document*);
106 OwnPtrWillBeMember<CanvasObserverProxy> m_canvasObserver;
108 // The name of the canvas.
110 // The document supplies the element and owns it.
111 RawPtrWillBeWeakMember<HTMLCanvasElement> m_element;
114 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue());
118 #endif // CSSCanvasValue_h