1/*
2 * Copyright (C) 2018 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#pragma once
27
28#include <wtf/Markable.h>
29#include <wtf/Seconds.h>
30
31namespace WebCore {
32
33inline double secondsToWebAnimationsAPITime(const Seconds time)
34{
35 // Precision of time values
36 // https://drafts.csswg.org/web-animations-1/#precision-of-time-values
37
38 // The internal representation of time values is implementation dependent however, it is RECOMMENDED that user
39 // agents be able to represent input time values with microsecond precision so that a time value (which nominally
40 // represents milliseconds) of 0.001 is distinguishable from 0.0.
41 auto roundedTime = std::round(time.microseconds()) / 1000;
42 if (roundedTime == -0)
43 return 0;
44 return roundedTime;
45}
46
47const auto timeEpsilon = Seconds::fromMilliseconds(0.001);
48
49struct WebAnimationsMarkableDoubleTraits {
50 static bool isEmptyValue(double value)
51 {
52 return std::isnan(value);
53 }
54
55 static constexpr double emptyValue()
56 {
57 return std::numeric_limits<double>::quiet_NaN();
58 }
59};
60
61using MarkableDouble = Markable<double, WebAnimationsMarkableDoubleTraits>;
62
63} // namespace WebCore
64
65