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/HashTraits.h" 31 #include "wtf/MathExtras.h" 32 33 namespace blink { 34 35 class SMILTime { 36 public: 37 SMILTime() : m_time(0) { } 38 SMILTime(double time) : m_time(time) { } 39 40 static SMILTime unresolved() { return std::numeric_limits<double>::quiet_NaN(); } 41 static SMILTime indefinite() { return std::numeric_limits<double>::infinity(); } 42 43 double value() const { return m_time; } 44 45 bool isFinite() const { return std::isfinite(m_time); } 46 bool isIndefinite() const { return std::isinf(m_time); } 47 bool isUnresolved() const { return std::isnan(m_time); } 48 49 private: 50 double m_time; 51 }; 52 53 class SMILTimeWithOrigin { 54 public: 55 enum Origin { 56 ParserOrigin, 57 ScriptOrigin 58 }; 59 60 SMILTimeWithOrigin() 61 : m_origin(ParserOrigin) 62 { 63 } 64 65 SMILTimeWithOrigin(const SMILTime& time, Origin origin) 66 : m_time(time) 67 , m_origin(origin) 68 { 69 } 70 71 const SMILTime& time() const { return m_time; } 72 bool originIsScript() const { return m_origin == ScriptOrigin; } 73 74 private: 75 SMILTime m_time; 76 Origin m_origin; 77 }; 78 79 struct SMILInterval { 80 SMILInterval() { } 81 SMILInterval(const SMILTime& begin, const SMILTime& end) : begin(begin), end(end) { } 82 83 SMILTime begin; 84 SMILTime end; 85 }; 86 87 inline bool operator==(const SMILTime& a, const SMILTime& b) { return (a.isUnresolved() && b.isUnresolved()) || a.value() == b.value(); } 88 inline bool operator!(const SMILTime& a) { return !a.isFinite() || !a.value(); } 89 inline bool operator!=(const SMILTime& a, const SMILTime& b) { return !operator==(a, b); } 90 91 // Ordering of SMILTimes has to follow: finite < indefinite (Inf) < unresolved (NaN). The first comparison is handled by IEEE754 but 92 // NaN values must be checked explicitly to guarantee that unresolved is ordered correctly too. 93 inline bool operator>(const SMILTime& a, const SMILTime& b) { return a.isUnresolved() || (a.value() > b.value()); } 94 inline bool operator<(const SMILTime& a, const SMILTime& b) { return operator>(b, a); } 95 inline bool operator>=(const SMILTime& a, const SMILTime& b) { return operator>(a, b) || operator==(a, b); } 96 inline bool operator<=(const SMILTime& a, const SMILTime& b) { return operator<(a, b) || operator==(a, b); } 97 inline bool operator<(const SMILTimeWithOrigin& a, const SMILTimeWithOrigin& b) { return a.time() < b.time(); } 98 99 inline SMILTime operator+(const SMILTime& a, const SMILTime& b) { return a.value() + b.value(); } 100 inline SMILTime operator-(const SMILTime& a, const SMILTime& b) { return a.value() - b.value(); } 101 // So multiplying times does not make too much sense but SMIL defines it for duration * repeatCount 102 SMILTime operator*(const SMILTime&, const SMILTime&); 103 104 inline bool operator!=(const SMILInterval& a, const SMILInterval& b) 105 { 106 // Compare the "raw" values since the operator!= for SMILTime always return 107 // true for non-finite times. 108 return a.begin.value() != b.begin.value() || a.end.value() != b.end.value(); 109 } 110 111 struct SMILTimeHash { 112 static unsigned hash(const SMILTime& key) { return WTF::FloatHash<double>::hash(key.value()); } 113 static bool equal(const SMILTime& a, const SMILTime& b) { return WTF::FloatHash<double>::equal(a.value(), b.value()); } 114 static const bool safeToCompareToEmptyOrDeleted = true; 115 }; 116 117 } // namespace blink 118 119 namespace WTF { 120 121 template<> struct DefaultHash<blink::SMILTime> { 122 typedef blink::SMILTimeHash Hash; 123 }; 124 125 template<> struct HashTraits<blink::SMILTime> : GenericHashTraits<blink::SMILTime> { 126 static blink::SMILTime emptyValue() { return blink::SMILTime::unresolved(); } 127 static void constructDeletedValue(blink::SMILTime& slot, bool) { slot = -std::numeric_limits<double>::infinity(); } 128 static bool isDeletedValue(blink::SMILTime value) { return value == -std::numeric_limits<double>::infinity(); } 129 }; 130 131 } // namespace WTF 132 133 #endif // SMILTime_h 134
