/*

 * Copyright (C) 2008 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 CSSImageGeneratorValue_h

#define CSSImageGeneratorValue_h

#include "CSSValue.h"

#include "IntSizeHash.h"

#include <wtf/HashMap.h>

#include <wtf/HashCountedSet.h>

#include <wtf/RefPtr.h>

namespace WebCore {

class Image;

class StyleGeneratedImage;

class RenderObject;

class CSSImageGeneratorValue : public CSSValue {

public:

    virtual ~CSSImageGeneratorValue();

    void addClient(RenderObject*, const IntSize&);

    void removeClient(RenderObject*);

    virtual Image* image(RenderObject*, const IntSize&) = 0;

    StyleGeneratedImage* generatedImage();

    virtual bool isFixedSize() const { return false; }

    virtual IntSize fixedSize(const RenderObject*) { return IntSize(); }

protected:

    CSSImageGeneratorValue();

    Image* getImage(RenderObject*, const IntSize&);

    void putImage(const IntSize&, PassRefPtr<Image>);

    typedef pair<IntSize, int> SizeCountPair;

    typedef HashMap<RenderObject*, SizeCountPair> RenderObjectSizeCountMap;

    HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.

    RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes.

    HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.

    RefPtr<StyleGeneratedImage> m_image;

    bool m_accessedImage;

private:

    virtual bool isImageGeneratorValue() const { return true; }

};

} // namespace WebCore

#endif // CSSImageGeneratorValue_h