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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 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 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.
*/
#pragma once
#include "CSSImageGeneratorValue.h"
#include "CanvasBase.h"
#include "HTMLCanvasElement.h"
#include "RenderElement.h"
namespace WebCore {
class Document;
class CSSCanvasValue final : public CSSImageGeneratorValue {
public:
static Ref<CSSCanvasValue> create(const String& name) { return adoptRef(*new CSSCanvasValue(name)); }
~CSSCanvasValue();
String customCSSText() const;
RefPtr<Image> image(RenderElement&, const FloatSize&);
bool isFixedSize() const { return true; }
FloatSize fixedSize(const RenderElement&);
HTMLCanvasElement* element() const { return m_element; }
bool isPending() const { return false; }
void loadSubimages(CachedResourceLoader&, const ResourceLoaderOptions&) { }
bool equals(const CSSCanvasValue&) const;
// NOTE: We put the CanvasObserver in a member instead of inheriting from it
// to avoid adding a vptr to CSSCanvasValue.
class CanvasObserverProxy final : public CanvasObserver {
public:
explicit CanvasObserverProxy(CSSCanvasValue& ownerValue)
: m_ownerValue(ownerValue)
{
}
bool isCanvasObserverProxy() const final { return true; }
const CSSCanvasValue& ownerValue() const { return m_ownerValue; }
private:
void canvasChanged(CanvasBase& canvasBase, const std::optional<FloatRect>& changedRect) final
{
ASSERT(is<HTMLCanvasElement>(canvasBase));
m_ownerValue.canvasChanged(downcast<HTMLCanvasElement>(canvasBase), changedRect);
}
void canvasResized(CanvasBase& canvasBase) final
{
ASSERT(is<HTMLCanvasElement>(canvasBase));
m_ownerValue.canvasResized(downcast<HTMLCanvasElement>(canvasBase));
}
void canvasDestroyed(CanvasBase& canvasBase) final
{
ASSERT(is<HTMLCanvasElement>(canvasBase));
m_ownerValue.canvasDestroyed(downcast<HTMLCanvasElement>(canvasBase));
}
CSSCanvasValue& m_ownerValue;
};
private:
explicit CSSCanvasValue(const String& name)
: CSSImageGeneratorValue(CanvasClass)
, m_canvasObserver(*this)
, m_name(name)
{
}
void canvasChanged(HTMLCanvasElement&, const std::optional<FloatRect>& changedRect);
void canvasResized(HTMLCanvasElement&);
void canvasDestroyed(HTMLCanvasElement&);
HTMLCanvasElement* element(Document&);
CanvasObserverProxy m_canvasObserver;
// The name of the canvas.
String m_name;
// The document supplies the element and owns it.
HTMLCanvasElement* m_element { nullptr };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSCanvasValue, isCanvasValue())
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CSSCanvasValue::CanvasObserverProxy)
static bool isType(const WebCore::CanvasObserver& canvasObserver) { return canvasObserver.isCanvasObserverProxy(); }
SPECIALIZE_TYPE_TRAITS_END()