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 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "core/animation/AnimatableImage.h"

#include "core/css/CSSImageValue.h"
#include "core/rendering/style/StyleGeneratedImage.h"
#include "wtf/MathExtras.h"

namespace WebCore {

PassRefPtr<AnimatableValue> AnimatableImage::interpolateTo(const AnimatableValue* value, double fraction) const
{
    if (fraction <= 0 || fraction >= 1)
        return defaultInterpolateTo(this, value, fraction);
    RefPtr<CSSValue> fromValue = this->toCSSValue();
    if (!fromValue->isImageValue() && !fromValue->isImageGeneratorValue()) {
        if (!m_image->isImageResource())
            return defaultInterpolateTo(this, value, fraction);
        ImageResource* resource = static_cast<ImageResource*>(m_image->data());
        fromValue = CSSImageValue::create(resource->url(), m_image.get());
    }
    const AnimatableImage* image = toAnimatableImage(value);
    RefPtr<CSSValue> toValue = image->toCSSValue();
    if (!toValue->isImageValue() && !toValue->isImageGeneratorValue()) {
        if (!image->m_image->isImageResource())
            return defaultInterpolateTo(this, value, fraction);
        ImageResource* resource = static_cast<ImageResource*>(image->m_image->data());
        toValue = CSSImageValue::create(resource->url(), image->m_image.get());
    }
    RefPtr<CSSCrossfadeValue> crossfadeValue = CSSCrossfadeValue::create(fromValue, toValue);
    crossfadeValue->setPercentage(CSSPrimitiveValue::create(fraction, CSSPrimitiveValue::CSS_NUMBER));
    return create(StyleGeneratedImage::create(crossfadeValue.get()).get());
}

PassRefPtr<AnimatableValue> AnimatableImage::addWith(const AnimatableValue* value) const
{
    // FIXME: Correct procedure is defined here: http://dev.w3.org/fxtf/web-animations/#the--image--type
    return defaultAddWith(this, value);
}

bool AnimatableImage::equalTo(const AnimatableValue* value) const
{
    return StyleImage::imagesEquivalent(m_image.get(), toAnimatableImage(value)->m_image.get());
}

}