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/*
* Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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 HTMLCanvasElement_h
#define HTMLCanvasElement_h
#include "bindings/core/v8/ScriptValue.h"
#include "bindings/core/v8/UnionTypesCore.h"
#include "core/dom/Document.h"
#include "core/html/HTMLElement.h"
#include "core/html/canvas/CanvasImageSource.h"
#include "platform/geometry/FloatRect.h"
#include "platform/geometry/IntSize.h"
#include "platform/graphics/GraphicsTypes.h"
#include "platform/graphics/GraphicsTypes3D.h"
#include "platform/graphics/ImageBufferClient.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebThread.h"
#define CanvasDefaultInterpolationQuality InterpolationLow
namespace blink {
class AffineTransform;
class CanvasContextCreationAttributes;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageData;
class ImageBuffer;
class ImageBufferSurface;
class IntSize;
class RecordingImageBufferFallbackSurfaceFactory;
class CanvasObserver : public WillBeGarbageCollectedMixin {
DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CanvasObserver);
public:
virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
virtual void canvasResized(HTMLCanvasElement*) = 0;
#if !ENABLE(OILPAN)
virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
#endif
virtual void trace(Visitor*) { }
};
class HTMLCanvasElement final : public HTMLElement, public DocumentVisibilityObserver, public CanvasImageSource, public ImageBufferClient, public blink::WebThread::TaskObserver {
DEFINE_WRAPPERTYPEINFO();
WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLCanvasElement);
public:
DECLARE_NODE_FACTORY(HTMLCanvasElement);
virtual ~HTMLCanvasElement();
void addObserver(CanvasObserver*);
void removeObserver(CanvasObserver*);
// Attributes and functions exposed to script
int width() const { return size().width(); }
int height() const { return size().height(); }
const IntSize& size() const { return m_size; }
void setWidth(int);
void setHeight(int);
void setAccelerationDisabled(bool accelerationDisabled) { m_accelerationDisabled = accelerationDisabled; }
bool accelerationDisabled() const { return m_accelerationDisabled; }
void setSize(const IntSize& newSize)
{
if (newSize == size())
return;
m_ignoreReset = true;
setWidth(newSize.width());
setHeight(newSize.height());
m_ignoreReset = false;
reset();
}
// Called by HTMLCanvasElement's V8 bindings.
ScriptValue getContext(ScriptState*, const String&, const CanvasContextCreationAttributes&);
// Called by Document::getCSSCanvasContext as well as above getContext() variant.
void getContext(const String&, const CanvasContextCreationAttributes&, CanvasRenderingContext2DOrWebGLRenderingContext&);
bool isPaintable() const;
static String toEncodingMimeType(const String& mimeType);
String toDataURL(const String& mimeType, const double* quality, ExceptionState&) const;
String toDataURL(const String& mimeType, ExceptionState& exceptionState) const { return toDataURL(mimeType, 0, exceptionState); }
// Used for rendering
void didDraw(const FloatRect&);
void notifyObserversCanvasChanged(const FloatRect&);
void paint(GraphicsContext*, const LayoutRect&);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
void ensureUnacceleratedImageBuffer();
ImageBuffer* buffer() const;
PassRefPtr<Image> copiedImage(SourceDrawingBuffer) const;
void clearCopiedImage();
SecurityOrigin* securityOrigin() const;
bool originClean() const { return m_originClean; }
void setOriginTainted() { m_originClean = false; }
AffineTransform baseTransform() const;
bool is3D() const;
bool hasImageBuffer() const { return m_imageBuffer; }
bool hasValidImageBuffer() const;
void discardImageBuffer();
bool shouldAccelerate(const IntSize&) const;
virtual const AtomicString imageSourceURL() const override;
virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
// DocumentVisibilityObserver implementation
virtual void didChangeVisibilityState(PageVisibilityState) override;
// CanvasImageSource implementation
virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const override;
virtual bool wouldTaintOrigin(SecurityOrigin*) const override;
virtual FloatSize sourceSize() const override;
virtual bool isCanvasElement() const override { return true; }
// ImageBufferClient implementation
virtual void notifySurfaceInvalid() override;
virtual bool isDirty() override { return !m_dirtyRect.isEmpty(); }
virtual void didFinalizeFrame() override;
virtual void restoreCanvasMatrixClipStack() override;
// Implementation of WebThread::TaskObserver methods
virtual void willProcessTask() override;
virtual void didProcessTask() override;
virtual void trace(Visitor*) override;
protected:
virtual void didMoveToNewDocument(Document& oldDocument) override;
private:
explicit HTMLCanvasElement(Document&);
virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
virtual RenderObject* createRenderer(RenderStyle*) override;
virtual void didRecalcStyle(StyleRecalcChange) override;
virtual bool areAuthorShadowsAllowed() const override { return false; }
void reset();
PassOwnPtr<RecordingImageBufferFallbackSurfaceFactory> createSurfaceFactory(const IntSize& deviceSize, int* msaaSampleCount) const;
PassOwnPtr<ImageBufferSurface> createImageBufferSurface(const IntSize& deviceSize, int* msaaSampleCount);
void createImageBuffer();
void createImageBufferInternal();
bool shouldUseDisplayList(const IntSize& deviceSize);
void resetDirtyRect();
void setSurfaceSize(const IntSize&);
bool paintsIntoCanvasBuffer() const;
void updateExternallyAllocatedMemory() const;
String toDataURLInternal(const String& mimeType, const double* quality, SourceDrawingBuffer) const;
WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver>> m_observers;
IntSize m_size;
OwnPtrWillBeMember<CanvasRenderingContext> m_context;
bool m_ignoreReset;
bool m_accelerationDisabled;
FloatRect m_dirtyRect;
mutable intptr_t m_externallyAllocatedMemory;
bool m_originClean;
// It prevents HTMLCanvasElement::buffer() from continuously re-attempting to allocate an imageBuffer
// after the first attempt failed.
mutable bool m_didFailToCreateImageBuffer;
bool m_imageBufferIsClear;
OwnPtr<ImageBuffer> m_imageBuffer;
mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
};
} // namespace blink
#endif // HTMLCanvasElement_h
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