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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
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      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/animation/animatable/AnimatableValue.h"
     33 
     34 #include "core/animation/animatable/AnimatableNeutral.h"
     35 #include "wtf/StdLibExtras.h"
     36 #include <algorithm>
     37 
     38 namespace {
     39 
     40 const double defaultDistance = 1;
     41 
     42 } // namespace
     43 
     44 namespace blink {
     45 
     46 const AnimatableValue* AnimatableValue::neutralValue()
     47 {
     48     DEFINE_STATIC_REF_WILL_BE_PERSISTENT(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
     49     return neutralSentinelValue;
     50 }
     51 
     52 PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
     53 {
     54     ASSERT(left);
     55     ASSERT(right);
     56     ASSERT(!left->isNeutral());
     57     ASSERT(!right->isNeutral());
     58 
     59     if (fraction && fraction != 1 && left->isSameType(right))
     60         return left->interpolateTo(right, fraction);
     61 
     62     return defaultInterpolateTo(left, right, fraction);
     63 }
     64 
     65 double AnimatableValue::distance(const AnimatableValue* left, const AnimatableValue* right)
     66 {
     67     ASSERT(left);
     68     ASSERT(right);
     69 
     70     if (left->isSameType(right))
     71         return left->distanceTo(right);
     72 
     73     return defaultDistance;
     74 }
     75 
     76 double AnimatableValue::distanceTo(const AnimatableValue*) const
     77 {
     78     return defaultDistance;
     79 }
     80 
     81 } // namespace blink
     82