CanvasRenderingContext.h   [plain text]

/*
 * Copyright (C) 2009 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 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 CanvasRenderingContext_h
#define CanvasRenderingContext_h

#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/text/StringHash.h>

namespace WebCore {

    class CanvasObject;
    class HTMLCanvasElement;
    class CanvasPattern;
    class HTMLImageElement;
    class HTMLVideoElement;
    class KURL;
    class WebGLObject;

    class CanvasRenderingContext : public Noncopyable {
    public:
        CanvasRenderingContext(HTMLCanvasElement*);
        virtual ~CanvasRenderingContext() { }
        
        // Ref and deref the m_canvas
        void ref();
        void deref();
        
        HTMLCanvasElement* canvas() const { return m_canvas; }
        
        virtual bool is2d() const { return false; }
        virtual bool is3d() const { return false; }

    protected:
        void checkOrigin(const CanvasPattern*);
        void checkOrigin(const HTMLCanvasElement*);
        void checkOrigin(const HTMLImageElement*);
        void checkOrigin(const HTMLVideoElement*);
        void checkOrigin(const KURL&);

    private:
        HTMLCanvasElement* m_canvas;
        HashSet<String> m_cleanOrigins;
    };

} // namespace WebCore

#endif