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SMILTime.h

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00001 /*
00002  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  * 1. Redistributions of source code must retain the above copyright
00008  *    notice, this list of conditions and the following disclaimer.
00009  * 2. Redistributions in binary form must reproduce the above copyright
00010  *    notice, this list of conditions and the following disclaimer in the
00011  *    documentation and/or other materials provided with the distribution.
00012  *
00013  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
00014  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00015  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00016  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
00017  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00018  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00019  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00020  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
00021  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00022  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00023  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
00024  */
00025 
00026 #ifndef SMILTime_h
00027 #define SMILTime_h
00028 
00029 #if ENABLE(SVG)
00030 
00031 #include <algorithm>
00032 
00033 namespace WebCore {
00034 
00035     class SMILTime {
00036     public:
00037         SMILTime() : m_time(0) { }
00038         SMILTime(double time) : m_time(time) { }
00039         SMILTime(const SMILTime& o) : m_time(o.m_time) { }
00040         
00041         static SMILTime unresolved() { return unresolvedValue; }
00042         static SMILTime indefinite() { return indefiniteValue; }
00043         
00044         SMILTime& operator=(const SMILTime& o) { m_time = o.m_time; return *this; }
00045         double value() const { return m_time; }
00046         
00047         bool isFinite() const { return m_time < indefiniteValue; }
00048         bool isIndefinite() const { return m_time == indefiniteValue; }
00049         bool isUnresolved() const { return m_time == unresolvedValue; }
00050         
00051     private:
00052         static const double unresolvedValue;
00053         static const double indefiniteValue;
00054 
00055         double m_time;
00056     };
00057 
00058     inline bool operator==(const SMILTime& a, const SMILTime& b) { return a.isFinite() && a.value() == b.value(); }
00059     inline bool operator!=(const SMILTime& a, const SMILTime& b) { return !operator==(a, b); }
00060     inline bool operator>(const SMILTime& a, const SMILTime& b) { return a.value() > b.value(); }
00061     inline bool operator<(const SMILTime& a, const SMILTime& b) { return a.value() < b.value(); }
00062     inline bool operator>=(const SMILTime& a, const SMILTime& b) { return a.value() > b.value() || operator==(a, b); }
00063     inline bool operator<=(const SMILTime& a, const SMILTime& b) { return a.value() < b.value() || operator==(a, b); }
00064 
00065     inline SMILTime max(const SMILTime& a, const SMILTime& b) { return std::max(a.value(), b.value()); }
00066     inline SMILTime min(const SMILTime& a, const SMILTime& b) { return std::min(a.value(), b.value()); }
00067     SMILTime operator+(const SMILTime&, const SMILTime&);
00068     SMILTime operator-(const SMILTime&, const SMILTime&);
00069     // So multiplying times does not make too much sense but SMIL defines it for duration * repeatCount
00070     SMILTime operator*(const SMILTime&, const SMILTime&);
00071 }
00072 
00073 #endif
00074 #endif

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