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/*
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CSSCanvasValue_h
#define CSSCanvasValue_h
#include "core/css/CSSImageGeneratorValue.h"
#include "core/html/HTMLCanvasElement.h"
namespace WebCore {
class Document;
class CSSCanvasValue : public CSSImageGeneratorValue {
public:
static PassRefPtrWillBeRawPtr<CSSCanvasValue> create(const String& name)
{
return adoptRefWillBeNoop(new CSSCanvasValue(name));
}
~CSSCanvasValue();
String customCSSText() const;
PassRefPtr<Image> image(RenderObject*, const IntSize&);
bool isFixedSize() const { return true; }
IntSize fixedSize(const RenderObject*);
bool isPending() const { return false; }
void loadSubimages(ResourceFetcher*) { }
bool equals(const CSSCanvasValue&) const;
void traceAfterDispatch(Visitor*);
private:
explicit CSSCanvasValue(const String& name)
: CSSImageGeneratorValue(CanvasClass)
, m_canvasObserver(adoptPtrWillBeNoop(new CanvasObserverProxy(this)))
, m_name(name)
, m_element(nullptr)
{
}
// NOTE: We put the CanvasObserver in a member instead of inheriting from it
// to avoid adding a vptr to CSSCanvasValue.
class CanvasObserverProxy FINAL : public NoBaseWillBeGarbageCollected<CanvasObserverProxy>, public CanvasObserver {
WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CanvasObserverProxy);
public:
explicit CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { }
virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect) OVERRIDE
{
m_ownerValue->canvasChanged(canvas, changedRect);
}
virtual void canvasResized(HTMLCanvasElement* canvas) OVERRIDE
{
m_ownerValue->canvasResized(canvas);
}
#if !ENABLE(OILPAN)
virtual void canvasDestroyed(HTMLCanvasElement* canvas) OVERRIDE
{
m_ownerValue->canvasDestroyed(canvas);
}
#endif
virtual void trace(Visitor* visitor) OVERRIDE
{
visitor->trace(m_ownerValue);
CanvasObserver::trace(visitor);
}
private:
RawPtrWillBeMember<CSSCanvasValue> m_ownerValue;
};
void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect);
void canvasResized(HTMLCanvasElement*);
#if !ENABLE(OILPAN)
void canvasDestroyed(HTMLCanvasElement*);
#endif
HTMLCanvasElement* element(Document*);
OwnPtrWillBeMember<CanvasObserverProxy> m_canvasObserver;
// The name of the canvas.
String m_name;
// The document supplies the element and owns it.
RawPtrWillBeWeakMember<HTMLCanvasElement> m_element;
};
DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue());
} // namespace WebCore
#endif // CSSCanvasValue_h
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