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/*
* Copyright (C) 2004, 2006, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
*
* 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 "TransformationMatrix.h"
#include "FloatRect.h"
#include "HTMLElement.h"
#if ENABLE(3D_CANVAS)
#include "GraphicsContext3D.h"
#endif
#include "IntSize.h"
namespace WebCore {
class CanvasContextAttributes;
class CanvasRenderingContext;
class FloatPoint;
class FloatRect;
class FloatSize;
class GraphicsContext;
class HTMLCanvasElement;
class ImageBuffer;
class IntPoint;
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 : public HTMLElement {
public:
HTMLCanvasElement(const QualifiedName&, Document*);
virtual ~HTMLCanvasElement();
int width() const { return m_size.width(); }
int height() const { return m_size.height(); }
void setWidth(int);
void setHeight(int);
String toDataURL(const String& mimeType, ExceptionCode&);
CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
const IntSize& size() const { return m_size; }
void setSize(const IntSize& size)
{
if (size == m_size)
return;
m_ignoreReset = true;
setWidth(size.width());
setHeight(size.height());
m_ignoreReset = false;
reset();
}
void willDraw(const FloatRect&);
void paint(GraphicsContext*, const IntRect&);
GraphicsContext* drawingContext() const;
ImageBuffer* buffer() const;
IntRect convertLogicalToDevice(const FloatRect&) const;
IntSize convertLogicalToDevice(const FloatSize&) const;
IntPoint convertLogicalToDevice(const FloatPoint&) const;
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
void setObserver(CanvasObserver* observer) { m_observer = observer; }
TransformationMatrix baseTransform() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
#if ENABLE(3D_CANVAS)
bool is3D() const;
#endif
private:
#if ENABLE(DASHBOARD_SUPPORT)
virtual HTMLTagStatus endTagRequirement() const;
virtual int tagPriority() const;
#endif
virtual void parseMappedAttribute(MappedAttribute*);
virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
void createImageBuffer() const;
void reset();
static const float MaxCanvasArea;
bool m_rendererIsCanvas;
OwnPtr<CanvasRenderingContext> m_context;
IntSize m_size;
CanvasObserver* m_observer;
bool m_originClean;
bool m_ignoreReset;
FloatRect m_dirtyRect;
// m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
mutable bool m_createdImageBuffer;
mutable OwnPtr<ImageBuffer> m_imageBuffer;
};
} //namespace
#endif
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