WebCore/html/HTMLCanvasElement.h

/*
 * Copyright (C) 2004, 2006 Apple Computer, 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 "HTMLElement.h"
#include "IntSize.h"

#if PLATFORM(CG)
// FIXME: CG-specific parts need to move to the platform directory.
typedef struct CGContext* CGContextRef;
typedef struct CGImage* CGImageRef;
#elif PLATFORM(QT)
class QImage;
class QPainter;
#elif PLATFORM(CAIRO)
typedef struct _cairo_surface cairo_surface_t;
#endif

namespace WebCore {

class CanvasRenderingContext2D;
typedef CanvasRenderingContext2D CanvasRenderingContext;
class FloatRect;
class GraphicsContext;

class HTMLCanvasElement : public HTMLElement {
public:
    HTMLCanvasElement(Document*);
    virtual ~HTMLCanvasElement();

    virtual HTMLTagStatus endTagRequirement() const;
    virtual int tagPriority() const;

    int width() const { return m_size.width(); }
    int height() const { return m_size.height(); }
    void setWidth(int);
    void setHeight(int);

    CanvasRenderingContext* getContext(const String&);
    // FIXME: Web Applications 1.0 describes a toDataURL function.

    virtual void parseMappedAttribute(MappedAttribute*);
    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);

    IntSize size() const { return m_size; }
    void willDraw(const FloatRect&);

    void paint(GraphicsContext*, const IntRect&);

    GraphicsContext* drawingContext() const;

#if PLATFORM(CG)
    CGImageRef createPlatformImage() const;
#elif PLATFORM(QT)
    QImage createPlatformImage() const;
#elif PLATFORM(CAIRO)
    cairo_surface_t* createPlatformImage() const;
#endif

private:
    void createDrawingContext() const;
    void reset();

    bool m_rendererIsCanvas;

    RefPtr<CanvasRenderingContext2D> m_2DContext;
    IntSize m_size;

    // FIXME: Web Applications 1.0 describes a security feature where we track
    // if we ever drew any images outside the domain, so we can disable toDataURL.

    mutable bool m_createdDrawingContext;
#if PLATFORM(CG)
    mutable void* m_data;
#elif PLATFORM(QT)
    mutable QImage* m_data;
    mutable QPainter* m_painter;
#elif PLATFORM(CAIRO)
    mutable void* m_data;
    mutable cairo_surface_t* m_surface;
#else
    mutable void* m_data;
#endif
    mutable GraphicsContext* m_drawingContext;
};

} //namespace

#endif