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:
7 *
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
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
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
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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
38namespace {
39
40const double defaultDistance = 1;
41
42} // namespace
43
44namespace blink {
45
46const AnimatableValue* AnimatableValue::neutralValue()
47{
48    DEFINE_STATIC_REF_WILL_BE_PERSISTENT(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
49    return neutralSentinelValue;
50}
51
52PassRefPtrWillBeRawPtr<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
65double 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
76double AnimatableValue::distanceTo(const AnimatableValue*) const
77{
78    return defaultDistance;
79}
80
81} // namespace blink
82