root/Source/core/animation/AnimatableValue.cpp

DEFINITIONS

1. neutralValue
2. interpolate
3. add
4. addWith
5. distance
6. distanceTo

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 *
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 * this software without specific prior written permission.
 *
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#include "config.h"
#include "core/animation/AnimatableValue.h"
#include "core/animation/AnimatableNeutral.h"
#include "wtf/StdLibExtras.h"
#include <algorithm>

namespace {

const double defaultDistance = 1;

} // namespace

namespace WebCore {

const AnimatableValue* AnimatableValue::neutralValue()
{
#if ENABLE_OILPAN
    DEFINE_STATIC_LOCAL(Persistent<AnimatableNeutral>, neutralSentinelValue, (AnimatableNeutral::create()));
    return neutralSentinelValue.get();
#else
    DEFINE_STATIC_REF(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
    return neutralSentinelValue;
#endif
}

PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
{
    ASSERT(left);
    ASSERT(right);
    ASSERT(!left->isNeutral());
    ASSERT(!right->isNeutral());

    if (fraction && fraction != 1 && left->isSameType(right))
        return left->interpolateTo(right, fraction);

    return defaultInterpolateTo(left, right, fraction);
}

PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::add(const AnimatableValue* left, const AnimatableValue* right)
{
    ASSERT(left);
    ASSERT(right);

    if (left->isNeutral())
        return takeConstRef(right);
    if (right->isNeutral())
        return takeConstRef(left);

    if (left->isSameType(right))
        return left->addWith(right);

    return defaultAddWith(left, right);
}

PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::addWith(const AnimatableValue* value) const
{
    return defaultAddWith(this, value);
}

double AnimatableValue::distance(const AnimatableValue* left, const AnimatableValue* right)
{
    ASSERT(left);
    ASSERT(right);

    if (left->isSameType(right))
        return left->distanceTo(right);

    return defaultDistance;
}

double AnimatableValue::distanceTo(const AnimatableValue*) const
{
    return defaultDistance;
}

} // namespace WebCore