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      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 "wtf/Assertions.h"
     30 #include "wtf/MathExtras.h"
     31 
     32 namespace WebCore {
     33 
     34 class SMILTime {
     35 public:
     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 
     50 private:
     51     static const double unresolvedValue;
     52     static const double indefiniteValue;
     53 
     54     double m_time;
     55 };
     56 
     57 class SMILTimeWithOrigin {
     58 public:
     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 
     78 private:
     79     SMILTime m_time;
     80     Origin m_origin;
     81 };
     82 
     83 struct SMILInterval {
     84     SMILInterval() { }
     85     SMILInterval(const SMILTime& begin, const SMILTime& end) : begin(begin), end(end) { }
     86 
     87     SMILTime begin;
     88     SMILTime end;
     89 };
     90 
     91 inline bool operator==(const SMILTime& a, const SMILTime& b) { return a.isFinite() && a.value() == b.value(); }
     92 inline bool operator!(const SMILTime& a) { return !a.isFinite() || !a.value(); }
     93 inline bool operator!=(const SMILTime& a, const SMILTime& b) { return !operator==(a, b); }
     94 inline bool operator>(const SMILTime& a, const SMILTime& b) { return a.value() > b.value(); }
     95 inline bool operator<(const SMILTime& a, const SMILTime& b) { return a.value() < b.value(); }
     96 inline bool operator>=(const SMILTime& a, const SMILTime& b) { return a.value() > b.value() || operator==(a, b); }
     97 inline bool operator<=(const SMILTime& a, const SMILTime& b) { return a.value() < b.value() || operator==(a, b); }
     98 inline bool operator<(const SMILTimeWithOrigin& a, const SMILTimeWithOrigin& b) { return a.time() < b.time(); }
     99 
    100 SMILTime operator+(const SMILTime&, const SMILTime&);
    101 SMILTime operator-(const SMILTime&, const SMILTime&);
    102 // So multiplying times does not make too much sense but SMIL defines it for duration * repeatCount
    103 SMILTime operator*(const SMILTime&, const SMILTime&);
    104 
    105 inline bool operator!=(const SMILInterval& a, const SMILInterval& b)
    106 {
    107     // Compare the "raw" values since the operator!= for SMILTime always return
    108     // true for non-finite times.
    109     return a.begin.value() != b.begin.value() || a.end.value() != b.end.value();
    110 }
    111 
    112 }
    113 
    114 #endif // SMILTime_h
    115