root/Source/core/animation/AnimatableImage.cpp

DEFINITIONS

1. usesDefaultInterpolationWith
2. interpolateTo
3. addWith
4. equalTo

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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 {

// FIXME: Once cross-fade works on generated image types, remove this method.
bool AnimatableImage::usesDefaultInterpolationWith(const AnimatableValue* value) const
{
    if (!m_value->isImageValue())
        return true;
    if (!toAnimatableImage(value)->toCSSValue()->isImageValue())
        return true;
    return false;
}

PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableImage::interpolateTo(const AnimatableValue* value, double fraction) const
{
    if (fraction <= 0 || fraction >= 1 || usesDefaultInterpolationWith(value))
        return defaultInterpolateTo(this, value, fraction);

    CSSValue* fromValue = toCSSValue();
    CSSValue* toValue = toAnimatableImage(value)->toCSSValue();

    RefPtrWillBeRawPtr<CSSCrossfadeValue> crossfadeValue = CSSCrossfadeValue::create(fromValue, toValue);
    crossfadeValue->setPercentage(CSSPrimitiveValue::create(fraction, CSSPrimitiveValue::CSS_NUMBER));
    return create(crossfadeValue);
}

PassRefPtrWillBeRawPtr<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 m_value->equals(*toAnimatableImage(value)->m_value.get());
}

}