/*

 * Copyright (C) 2009 Google 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:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "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 THE COPYRIGHT

 * OWNER 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 "WebImage.h"

#include "Image.h"

#include "ImageSource.h"

#include "NativeImageSkia.h"

#include "SharedBuffer.h"

#include "WebData.h"

#include "WebSize.h"

#include <wtf/OwnPtr.h>

#include <wtf/PassRefPtr.h>

using namespace WebCore;

namespace WebKit {

WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)

{

    ImageSource source;

    source.setData(PassRefPtr<SharedBuffer>(data).get(), true);

    if (!source.isSizeAvailable())

        return WebImage();

    // Frames are arranged by decreasing size, then decreasing bit depth.

    // Pick the frame closest to |desiredSize|'s area without being smaller,

    // which has the highest bit depth.

    const size_t frameCount = source.frameCount();

    size_t index = 0;  // Default to first frame if none are large enough.

    int frameAreaAtIndex = 0;

    for (size_t i = 0; i < frameCount; ++i) {

        const IntSize frameSize = source.frameSizeAtIndex(i);

        if (WebSize(frameSize) == desiredSize) {

            index = i;

            break;  // Perfect match.

        }

        const int frameArea = frameSize.width() * frameSize.height();

        if (frameArea < (desiredSize.width * desiredSize.height))

            break;  // No more frames that are large enough.

        if (!i || (frameArea < frameAreaAtIndex)) {

            index = i;  // Closer to desired area than previous best match.

            frameAreaAtIndex = frameArea;

        }

    }

    OwnPtr<NativeImageSkia> frame(source.createFrameAtIndex(index));

    if (!frame.get())

        return WebImage();

    return WebImage(*frame);

}

void WebImage::reset()

{

    m_bitmap.reset();

}

void WebImage::assign(const WebImage& image)

{

    m_bitmap = image.m_bitmap;

}

bool WebImage::isNull() const

{

    return m_bitmap.isNull();

}

WebSize WebImage::size() const

{

    return WebSize(m_bitmap.width(), m_bitmap.height());

}

WebImage::WebImage(const PassRefPtr<Image>& image)

{

    operator=(image);

}

WebImage& WebImage::operator=(const PassRefPtr<Image>& image)

{

    NativeImagePtr p;

    if (image.get() && (p = image->nativeImageForCurrentFrame()))

        assign(*p);

    else

        reset();

    return *this;

}

} // namespace WebKit