1/*
2 * Copyright (C) 2011 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef AnimationUtilities_h
27#define AnimationUtilities_h
28
29#include "IntPoint.h"
30#include "LayoutUnit.h"
31
32namespace WebCore {
33
34inline int blend(int from, int to, double progress)
35{
36 return static_cast<int>(lround(static_cast<double>(from) + static_cast<double>(to - from) * progress));
37}
38
39inline unsigned blend(unsigned from, unsigned to, double progress)
40{
41 return static_cast<unsigned>(lround(to > from ? static_cast<double>(from) + static_cast<double>(to - from) * progress : static_cast<double>(from) - static_cast<double>(from - to) * progress));
42}
43
44inline double blend(double from, double to, double progress)
45{
46 return from + (to - from) * progress;
47}
48
49inline float blend(float from, float to, double progress)
50{
51 return static_cast<float>(from + (to - from) * progress);
52}
53
54inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress)
55{
56 return from + (to - from) * progress;
57}
58
59inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress)
60{
61 return IntPoint(blend(from.x(), to.x(), progress),
62 blend(from.y(), to.y(), progress));
63}
64
65} // namespace WebCore
66
67#endif // AnimationUtilities_h
68