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/AnimatableValue.h"
33#include "core/animation/AnimatableNeutral.h"
34#include "wtf/StdLibExtras.h"
35#include <algorithm>
36
37namespace WebCore {
38
39const AnimatableValue* AnimatableValue::neutralValue()
40{
41    DEFINE_STATIC_REF(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
42    return neutralSentinelValue;
43}
44
45PassRefPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
46{
47    ASSERT(left);
48    ASSERT(right);
49    ASSERT(!left->isNeutral());
50    ASSERT(!right->isNeutral());
51
52    if (fraction && fraction != 1 && left->isSameType(right))
53        return left->interpolateTo(right, fraction);
54
55    return defaultInterpolateTo(left, right, fraction);
56}
57
58PassRefPtr<AnimatableValue> AnimatableValue::add(const AnimatableValue* left, const AnimatableValue* right)
59{
60    ASSERT(left);
61    ASSERT(right);
62
63    if (left->isNeutral())
64        return takeConstRef(right);
65    if (right->isNeutral())
66        return takeConstRef(left);
67
68    if (left->isSameType(right))
69        return left->addWith(right);
70
71    return defaultAddWith(left, right);
72}
73
74PassRefPtr<AnimatableValue> AnimatableValue::addWith(const AnimatableValue* value) const
75{
76    return defaultAddWith(this, value);
77}
78
79} // namespace WebCore
80