118 lines
4.2 KiB
C++
118 lines
4.2 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "CSSImageGeneratorValue.h"
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#include "CanvasBase.h"
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#include "HTMLCanvasElement.h"
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#include "RenderElement.h"
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namespace WebCore {
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class Document;
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class CSSCanvasValue final : public CSSImageGeneratorValue {
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public:
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static Ref<CSSCanvasValue> create(const String& name) { return adoptRef(*new CSSCanvasValue(name)); }
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~CSSCanvasValue();
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String customCSSText() const;
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RefPtr<Image> image(RenderElement&, const FloatSize&);
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bool isFixedSize() const { return true; }
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FloatSize fixedSize(const RenderElement&);
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HTMLCanvasElement* element() const { return m_element; }
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bool isPending() const { return false; }
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void loadSubimages(CachedResourceLoader&, const ResourceLoaderOptions&) { }
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bool equals(const CSSCanvasValue&) const;
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// NOTE: We put the CanvasObserver in a member instead of inheriting from it
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// to avoid adding a vptr to CSSCanvasValue.
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class CanvasObserverProxy final : public CanvasObserver {
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public:
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explicit CanvasObserverProxy(CSSCanvasValue& ownerValue)
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: m_ownerValue(ownerValue)
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{
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}
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bool isCanvasObserverProxy() const final { return true; }
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const CSSCanvasValue& ownerValue() const { return m_ownerValue; }
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private:
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void canvasChanged(CanvasBase& canvasBase, const std::optional<FloatRect>& changedRect) final
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{
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ASSERT(is<HTMLCanvasElement>(canvasBase));
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m_ownerValue.canvasChanged(downcast<HTMLCanvasElement>(canvasBase), changedRect);
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}
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void canvasResized(CanvasBase& canvasBase) final
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{
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ASSERT(is<HTMLCanvasElement>(canvasBase));
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m_ownerValue.canvasResized(downcast<HTMLCanvasElement>(canvasBase));
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}
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void canvasDestroyed(CanvasBase& canvasBase) final
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{
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ASSERT(is<HTMLCanvasElement>(canvasBase));
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m_ownerValue.canvasDestroyed(downcast<HTMLCanvasElement>(canvasBase));
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}
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CSSCanvasValue& m_ownerValue;
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};
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private:
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explicit CSSCanvasValue(const String& name)
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: CSSImageGeneratorValue(CanvasClass)
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, m_canvasObserver(*this)
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, m_name(name)
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{
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}
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void canvasChanged(HTMLCanvasElement&, const std::optional<FloatRect>& changedRect);
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void canvasResized(HTMLCanvasElement&);
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void canvasDestroyed(HTMLCanvasElement&);
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HTMLCanvasElement* element(Document&);
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CanvasObserverProxy m_canvasObserver;
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// The name of the canvas.
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String m_name;
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// The document supplies the element and owns it.
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HTMLCanvasElement* m_element { nullptr };
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};
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} // namespace WebCore
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SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSCanvasValue, isCanvasValue())
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SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CSSCanvasValue::CanvasObserverProxy)
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static bool isType(const WebCore::CanvasObserver& canvasObserver) { return canvasObserver.isCanvasObserverProxy(); }
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SPECIALIZE_TYPE_TRAITS_END()
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