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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 "FloatRect.h"
#include "HTMLElement.h"
#include "IntSize.h"
#include <wtf/Forward.h>
#if PLATFORM(QT)
#define DefaultInterpolationQuality InterpolationMedium
#elif USE(CG)
#define DefaultInterpolationQuality InterpolationLow
#else
#define DefaultInterpolationQuality InterpolationDefault
#endif
namespace WebCore {
class CanvasContextAttributes;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageData;
class ImageBuffer;
class IntSize;
class CanvasObserver {
public:
virtual ~CanvasObserver() { }
virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
virtual void canvasResized(HTMLCanvasElement*) = 0;
virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
};
class HTMLCanvasElement FINAL : public HTMLElement {
public:
static PassRefPtr<HTMLCanvasElement> create(Document*);
static PassRefPtr<HTMLCanvasElement> create(const QualifiedName&, Document*);
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 setSize(const IntSize& newSize)
{
if (newSize == size() && targetDeviceScaleFactor() == m_deviceScaleFactor)
return;
m_ignoreReset = true;
setWidth(newSize.width());
setHeight(newSize.height());
m_ignoreReset = false;
reset();
}
CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
bool supportsContext(const String&, CanvasContextAttributes* = 0);
static bool is2dType(const String&);
#if ENABLE(WEBGL)
static bool is3dType(const String&);
#endif
static String toEncodingMimeType(const String& mimeType);
String toDataURL(const String& mimeType, const double* quality, ExceptionCode&);
String toDataURL(const String& mimeType, ExceptionCode& ec) { return toDataURL(mimeType, 0, ec); }
// Used for rendering
void didDraw(const FloatRect&);
void notifyObserversCanvasChanged(const FloatRect&);
void paint(GraphicsContext*, const LayoutRect&, bool useLowQualityScale = false);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
ImageBuffer* buffer() const;
Image* copiedImage() const;
void clearCopiedImage();
PassRefPtr<ImageData> getImageData();
void makePresentationCopy();
void clearPresentationCopy();
FloatRect convertLogicalToDevice(const FloatRect&) const;
FloatSize convertLogicalToDevice(const FloatSize&) const;
FloatSize convertDeviceToLogical(const FloatSize&) const;
SecurityOrigin* securityOrigin() const;
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
AffineTransform baseTransform() const;
#if ENABLE(WEBGL)
bool is3D() const;
#endif
void makeRenderingResultsAvailable();
bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; }
bool shouldAccelerate(const IntSize&) const;
float deviceScaleFactor() const { return m_deviceScaleFactor; }
private:
HTMLCanvasElement(const QualifiedName&, Document*);
virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
virtual bool areAuthorShadowsAllowed() const OVERRIDE;
virtual bool canContainRangeEndPoint() const OVERRIDE;
virtual bool canStartSelection() const OVERRIDE;
void reset();
float targetDeviceScaleFactor() const;
void createImageBuffer() const;
void clearImageBuffer() const;
void setSurfaceSize(const IntSize&);
bool paintsIntoCanvasBuffer() const;
HashSet<CanvasObserver*> m_observers;
IntSize m_size;
OwnPtr<CanvasRenderingContext> m_context;
bool m_rendererIsCanvas;
bool m_ignoreReset;
FloatRect m_dirtyRect;
float m_deviceScaleFactor;
bool m_originClean;
// m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
mutable bool m_hasCreatedImageBuffer;
mutable bool m_didClearImageBuffer;
mutable OwnPtr<ImageBuffer> m_imageBuffer;
mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_presentedImage;
mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
};
} //namespace
#endif
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