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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
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      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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      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.
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     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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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/AnimatableValue.h"
     33 #include "core/animation/AnimatableNeutral.h"
     34 #include "wtf/StdLibExtras.h"
     35 #include <algorithm>
     36 
     37 namespace {
     38 
     39 const double defaultDistance = 1;
     40 
     41 } // namespace
     42 
     43 namespace WebCore {
     44 
     45 const AnimatableValue* AnimatableValue::neutralValue()
     46 {
     47     DEFINE_STATIC_REF_WILL_BE_PERSISTENT(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
     48     return neutralSentinelValue;
     49 }
     50 
     51 PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
     52 {
     53     ASSERT(left);
     54     ASSERT(right);
     55     ASSERT(!left->isNeutral());
     56     ASSERT(!right->isNeutral());
     57 
     58     if (fraction && fraction != 1 && left->isSameType(right))
     59         return left->interpolateTo(right, fraction);
     60 
     61     return defaultInterpolateTo(left, right, fraction);
     62 }
     63 
     64 double AnimatableValue::distance(const AnimatableValue* left, const AnimatableValue* right)
     65 {
     66     ASSERT(left);
     67     ASSERT(right);
     68 
     69     if (left->isSameType(right))
     70         return left->distanceTo(right);
     71 
     72     return defaultDistance;
     73 }
     74 
     75 double AnimatableValue::distanceTo(const AnimatableValue*) const
     76 {
     77     return defaultDistance;
     78 }
     79 
     80 } // namespace WebCore
     81