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/*
* Copyright (C) 2017 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 "CanvasNoiseInjection.h"
#include "FloatRect.h"
#include "IntSize.h"
#include "PixelBuffer.h"
#include "TaskSource.h"
#include <wtf/HashSet.h>
#include <wtf/TypeCasts.h>
#include <wtf/WeakHashSet.h>
namespace WebCore {
class AffineTransform;
class CanvasBase;
class CanvasObserver;
class CanvasRenderingContext;
class Element;
class Event;
class GraphicsClient;
class GraphicsContext;
class GraphicsContextStateSaver;
class Image;
class ImageBuffer;
class IntRect;
class ScriptExecutionContext;
class SecurityOrigin;
class WebCoreOpaqueRoot;
enum class ShouldApplyPostProcessingToDirtyRect : bool { No, Yes };
class CanvasDisplayBufferObserver : public CanMakeWeakPtr<CanvasDisplayBufferObserver> {
public:
virtual ~CanvasDisplayBufferObserver() = default;
virtual void canvasDisplayBufferPrepared(CanvasBase&) = 0;
};
class CanvasBase {
public:
virtual ~CanvasBase();
virtual void refCanvasBase() = 0;
virtual void derefCanvasBase() = 0;
void ref() { refCanvasBase(); }
void deref() { derefCanvasBase(); }
virtual bool isHTMLCanvasElement() const { return false; }
virtual bool isOffscreenCanvas() const { return false; }
virtual bool isCustomPaintCanvas() const { return false; }
virtual unsigned width() const { return m_size.width(); }
virtual unsigned height() const { return m_size.height(); }
const IntSize& size() const { return m_size; }
ImageBuffer* buffer() const;
virtual void setImageBufferAndMarkDirty(RefPtr<ImageBuffer>&&) { }
virtual AffineTransform baseTransform() const;
void makeRenderingResultsAvailable();
size_t memoryCost() const;
size_t externalMemoryCost() const;
void setOriginClean() { m_originClean = true; }
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
virtual SecurityOrigin* securityOrigin() const { return nullptr; }
ScriptExecutionContext* scriptExecutionContext() const { return canvasBaseScriptExecutionContext(); }
virtual CanvasRenderingContext* renderingContext() const = 0;
void addObserver(CanvasObserver&);
void removeObserver(CanvasObserver&);
bool hasObserver(CanvasObserver&) const;
void notifyObserversCanvasChanged(const std::optional<FloatRect>&);
void notifyObserversCanvasResized();
void notifyObserversCanvasDestroyed(); // Must be called in destruction before clearing m_context.
void addDisplayBufferObserver(CanvasDisplayBufferObserver&);
void removeDisplayBufferObserver(CanvasDisplayBufferObserver&);
void notifyObserversCanvasDisplayBufferPrepared();
bool hasDisplayBufferObservers() const { return !m_displayBufferObservers.isEmptyIgnoringNullReferences(); }
HashSet<Element*> cssCanvasClients() const;
virtual GraphicsContext* drawingContext() const;
virtual GraphicsContext* existingDrawingContext() const;
GraphicsClient* graphicsClient() const;
void didDraw(const std::optional<FloatRect>& rect) { return didDraw(rect, ShouldApplyPostProcessingToDirtyRect::Yes); }
virtual void didDraw(const std::optional<FloatRect>&, ShouldApplyPostProcessingToDirtyRect);
virtual Image* copiedImage() const = 0;
virtual void clearCopiedImage() const = 0;
bool hasActiveInspectorCanvasCallTracer() const;
bool shouldAccelerate(const IntSize&) const;
bool shouldAccelerate(unsigned area) const;
WEBCORE_EXPORT static void setMaxCanvasAreaForTesting(std::optional<size_t>);
virtual void queueTaskKeepingObjectAlive(TaskSource, Function<void()>&&) = 0;
virtual void dispatchEvent(Event&) = 0;
bool postProcessPixelBufferResults(Ref<PixelBuffer>&&) const;
void recordLastFillText(const String&);
protected:
explicit CanvasBase(IntSize, const std::optional<NoiseInjectionHashSalt>&);
virtual ScriptExecutionContext* canvasBaseScriptExecutionContext() const = 0;
virtual void setSize(const IntSize& size) { m_size = size; }
RefPtr<ImageBuffer> setImageBuffer(RefPtr<ImageBuffer>&&) const;
virtual bool hasCreatedImageBuffer() const { return false; }
static size_t activePixelMemory();
void resetGraphicsContextState() const;
RefPtr<ImageBuffer> allocateImageBuffer(bool usesDisplayListDrawing, bool avoidBackendSizeCheckForTesting) const;
String lastFillText() const { return m_lastFillText; }
private:
bool shouldInjectNoiseBeforeReadback() const;
virtual void createImageBuffer() const { }
mutable IntSize m_size;
mutable Lock m_imageBufferAssignmentLock;
mutable RefPtr<ImageBuffer> m_imageBuffer;
mutable size_t m_imageBufferCost { 0 };
mutable std::unique_ptr<GraphicsContextStateSaver> m_contextStateSaver;
String m_lastFillText;
CanvasNoiseInjection m_canvasNoiseInjection;
Markable<NoiseInjectionHashSalt, IntegralMarkableTraits<NoiseInjectionHashSalt>> m_canvasNoiseHashSalt;
bool m_originClean { true };
#if ASSERT_ENABLED
bool m_didNotifyObserversCanvasDestroyed { false };
#endif
WeakHashSet<CanvasObserver> m_observers;
WeakHashSet<CanvasDisplayBufferObserver> m_displayBufferObservers;
};
WebCoreOpaqueRoot root(CanvasBase*);
} // namespace WebCore
#define SPECIALIZE_TYPE_TRAITS_CANVAS(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CanvasBase& canvas) { return canvas.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()
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