1/*
2 * Copyright (C) 2008 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 SMILTime_h
27#define SMILTime_h
28
29#include <algorithm>
30#include <cmath>
31
32namespace WebCore {
33
34class SMILTime {
35public:
36    SMILTime() : m_time(0) { }
37    SMILTime(double time) : m_time(time) { ASSERT(!std::isnan(time)); }
38    SMILTime(const SMILTime& o) : m_time(o.m_time) { }
39
40    static SMILTime unresolved() { return unresolvedValue; }
41    static SMILTime indefinite() { return indefiniteValue; }
42
43    SMILTime& operator=(const SMILTime& o) { m_time = o.m_time; return *this; }
44    double value() const { return m_time; }
45
46    bool isFinite() const { return m_time < indefiniteValue; }
47    bool isIndefinite() const { return m_time == indefiniteValue; }
48    bool isUnresolved() const { return m_time == unresolvedValue; }
49
50private:
51    static const double unresolvedValue;
52    static const double indefiniteValue;
53
54    double m_time;
55};
56
57class SMILTimeWithOrigin {
58public:
59    enum Origin {
60        ParserOrigin,
61        ScriptOrigin
62    };
63
64    SMILTimeWithOrigin()
65        : m_origin(ParserOrigin)
66    {
67    }
68
69    SMILTimeWithOrigin(const SMILTime& time, Origin origin)
70        : m_time(time)
71        , m_origin(origin)
72    {
73    }
74
75    const SMILTime& time() const { return m_time; }
76    bool originIsScript() const { return m_origin == ScriptOrigin; }
77
78private:
79    SMILTime m_time;
80    Origin m_origin;
81};
82
83inline bool operator==(const SMILTime& a, const SMILTime& b) { return a.isFinite() && a.value() == b.value(); }
84inline bool operator!(const SMILTime& a) { return !a.isFinite() || !a.value(); }
85inline bool operator!=(const SMILTime& a, const SMILTime& b) { return !operator==(a, b); }
86inline bool operator>(const SMILTime& a, const SMILTime& b) { return a.value() > b.value(); }
87inline bool operator<(const SMILTime& a, const SMILTime& b) { return a.value() < b.value(); }
88inline bool operator>=(const SMILTime& a, const SMILTime& b) { return a.value() > b.value() || operator==(a, b); }
89inline bool operator<=(const SMILTime& a, const SMILTime& b) { return a.value() < b.value() || operator==(a, b); }
90inline bool operator<(const SMILTimeWithOrigin& a, const SMILTimeWithOrigin& b) { return a.time() < b.time(); }
91
92SMILTime operator+(const SMILTime&, const SMILTime&);
93SMILTime operator-(const SMILTime&, const SMILTime&);
94// So multiplying times does not make too much sense but SMIL defines it for duration * repeatCount
95SMILTime operator*(const SMILTime&, const SMILTime&);
96
97}
98
99#endif // SMILTime_h
100