143 lines
4.8 KiB
C++
143 lines
4.8 KiB
C++
/*
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* Copyright (C) 2017 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 "IntSize.h"
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#include <wtf/HashSet.h>
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#include <wtf/TypeCasts.h>
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namespace WebCore {
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class AffineTransform;
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class CanvasBase;
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class CanvasRenderingContext;
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class Element;
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class GraphicsContext;
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class GraphicsContextStateSaver;
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class Image;
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class ImageBuffer;
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class FloatRect;
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class ScriptExecutionContext;
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class SecurityOrigin;
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class CanvasObserver {
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public:
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virtual ~CanvasObserver() = default;
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virtual bool isCanvasObserverProxy() const { return false; }
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virtual void canvasChanged(CanvasBase&, const std::optional<FloatRect>& changedRect) = 0;
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virtual void canvasResized(CanvasBase&) = 0;
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virtual void canvasDestroyed(CanvasBase&) = 0;
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};
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class CanvasBase {
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public:
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virtual ~CanvasBase();
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virtual void refCanvasBase() = 0;
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virtual void derefCanvasBase() = 0;
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virtual bool isHTMLCanvasElement() const { return false; }
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virtual bool isOffscreenCanvas() const { return false; }
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virtual bool isCustomPaintCanvas() const { return false; }
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virtual unsigned width() const { return m_size.width(); }
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virtual unsigned height() const { return m_size.height(); }
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const IntSize& size() const { return m_size; }
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ImageBuffer* buffer() const;
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virtual AffineTransform baseTransform() const;
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void makeRenderingResultsAvailable();
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size_t memoryCost() const;
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size_t externalMemoryCost() const;
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void setOriginClean() { m_originClean = true; }
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void setOriginTainted() { m_originClean = false; }
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bool originClean() const { return m_originClean; }
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virtual SecurityOrigin* securityOrigin() const { return nullptr; }
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ScriptExecutionContext* scriptExecutionContext() const { return canvasBaseScriptExecutionContext(); }
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virtual CanvasRenderingContext* renderingContext() const = 0;
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void addObserver(CanvasObserver&);
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void removeObserver(CanvasObserver&);
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void notifyObserversCanvasChanged(const std::optional<FloatRect>&);
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void notifyObserversCanvasResized();
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void notifyObserversCanvasDestroyed(); // Must be called in destruction before clearing m_context.
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HashSet<Element*> cssCanvasClients() const;
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virtual GraphicsContext* drawingContext() const;
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virtual GraphicsContext* existingDrawingContext() const;
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virtual void didDraw(const std::optional<FloatRect>&) = 0;
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virtual Image* copiedImage() const = 0;
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virtual void clearCopiedImage() const = 0;
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bool hasActiveInspectorCanvasCallTracer() const;
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protected:
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explicit CanvasBase(IntSize);
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virtual ScriptExecutionContext* canvasBaseScriptExecutionContext() const = 0;
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virtual void setSize(const IntSize& size) { m_size = size; }
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RefPtr<ImageBuffer> setImageBuffer(RefPtr<ImageBuffer>&&) const;
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virtual bool hasCreatedImageBuffer() const { return false; }
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static size_t activePixelMemory();
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void resetGraphicsContextState() const;
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private:
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virtual void createImageBuffer() const { }
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mutable IntSize m_size;
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mutable Lock m_imageBufferAssignmentLock;
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mutable RefPtr<ImageBuffer> m_imageBuffer;
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mutable size_t m_imageBufferCost { 0 };
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mutable std::unique_ptr<GraphicsContextStateSaver> m_contextStateSaver;
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bool m_originClean { true };
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#if ASSERT_ENABLED
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bool m_didNotifyObserversCanvasDestroyed { false };
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#endif
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HashSet<CanvasObserver*> m_observers;
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};
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} // namespace WebCore
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#define SPECIALIZE_TYPE_TRAITS_CANVAS(ToValueTypeName, predicate) \
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SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
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static bool isType(const WebCore::CanvasBase& canvas) { return canvas.predicate; } \
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SPECIALIZE_TYPE_TRAITS_END()
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