/*

 * 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. 

 */

#include "config.h"

#include "CSSImageGeneratorValue.h"

#include "Image.h"

#include "IntSize.h"

#include "IntSizeHash.h"

#include "PlatformString.h"

#include "RenderObject.h"

#include "StyleGeneratedImage.h"

namespace WebCore {

CSSImageGeneratorValue::CSSImageGeneratorValue()

: m_accessedImage(false)

{

}

CSSImageGeneratorValue::~CSSImageGeneratorValue()

{

}

void CSSImageGeneratorValue::addClient(RenderObject* renderer, const IntSize& size)

{

    ref();

    if (!size.isEmpty())

        m_sizes.add(size);

    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);

    if (it == m_clients.end())

        m_clients.add(renderer, SizeCountPair(size, 1));

    else {

        SizeCountPair& sizeCount = it->second;

        ++sizeCount.second;

    }

}

void CSSImageGeneratorValue::removeClient(RenderObject* renderer)

{

    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);

    ASSERT(it != m_clients.end());

    SizeCountPair& sizeCount = it->second;

    IntSize size = sizeCount.first;

    if (!size.isEmpty()) {

        m_sizes.remove(size);

        if (!m_sizes.contains(size))

            m_images.remove(size);

    }

    if (!--sizeCount.second)

        m_clients.remove(renderer);

    deref();

}

Image* CSSImageGeneratorValue::getImage(RenderObject* renderer, const IntSize& size)

{

    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);

    ASSERT(it != m_clients.end());

    SizeCountPair& sizeCount = it->second;

    IntSize oldSize = sizeCount.first;

    if (oldSize != size) {

        removeClient(renderer);

        addClient(renderer, size);

    }

    // Don't generate an image for empty sizes.

    if (size.isEmpty())

        return 0;

    // Look up the image in our cache.

    return m_images.get(size).get();

}

void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)

{

    m_images.add(size, image);

}

StyleGeneratedImage* CSSImageGeneratorValue::generatedImage()

{

    if (!m_accessedImage) {

        m_accessedImage = true;

        m_image = StyleGeneratedImage::create(this, isFixedSize());

    }

    return m_image.get();

}

} // namespace WebCore