text: /*
   * Copyright (C) 2013 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "core/animation/animatable/AnimatableValue.h"
  
  #include "core/animation/animatable/AnimatableNeutral.h"
  #include "wtf/StdLibExtras.h"
  #include <algorithm>
  
  namespace {
  
  const double defaultDistance = 1;
  
  } // namespace
  
  namespace blink {
  
  const AnimatableValue* AnimatableValue::neutralValue()
  {
      DEFINE_STATIC_REF_WILL_BE_PERSISTENT(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
      return neutralSentinelValue;
  }
  
  PassRefPtr<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);
  }
  
  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 blink
  