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MathExtras.h
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1/*
2 * Copyright (C) 2006, 2007 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 COMPUTER, 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 COMPUTER, 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 WTF_MathExtras_h
27#define WTF_MathExtras_h
28
29#include <math.h>
30
31#if PLATFORM(WIN)
32
33#include "kjs/operations.h"
34#include "kjs/value.h"
35#include <xmath.h>
36#include <limits>
37
38#if HAVE(FLOAT_H)
39#include <float.h>
40#endif
41
42#endif
43
44#ifndef M_PI
45const double piDouble = 3.14159265358979323846;
46const float piFloat = 3.14159265358979323846f;
47#else
48const double piDouble = M_PI;
49const float piFloat = static_cast<float>(M_PI);
50#endif
51
52#ifndef M_PI_4
53const double piOverFourDouble = 0.785398163397448309616;
54const float piOverFourFloat = 0.785398163397448309616f;
55#else
56const double piOverFourDouble = M_PI_4;
57const float piOverFourFloat = static_cast<float>(M_PI_4);
58#endif // !BUILDING_KDE__
59
60#if COMPILER(MSVC)
61
62#ifndef BUILDING_KDE__
63 inline bool isinf(double num) { return !_finite(num) && !_isnan(num); }
64 inline bool isnan(double num) { return _isnan(num); }
65 inline long lround(double num) { return num > 0 ? num + 0.5 : ceil(num - 0.5); }
66 inline long lroundf(float num) { return num > 0 ? num + 0.5f : ceilf(num - 0.5f); }
67 inline double round(double num) { return num > 0 ? floor(num + 0.5) : ceil(num - 0.5); }
68 inline float roundf(float num) { return num > 0 ? floorf(num + 0.5f) : ceilf(num - 0.5f); }
69 inline bool signbit(double num) { return _copysign(1.0, num) < 0; }
70#endif
71
72#ifndef BUILDING_KDE__
73// FIXME: where to get std::numeric_limits from?
74// Work around a bug in Win, where atan2(+-infinity, +-infinity) yields NaN instead of specific values.
75inline double wtf_atan2(double x, double y)
76{
77 static double posInf = std::numeric_limits<double>::infinity();
78 static double negInf = -std::numeric_limits<double>::infinity();
79
80 double result = KJS::NaN;
81
82 if (x == posInf && y == posInf)
83 result = piOverFourDouble;
84 else if (x == posInf && y == negInf)
85 result = 3 * piOverFourDouble;
86 else if (x == negInf && y == posInf)
87 result = -piOverFourDouble;
88 else if (x == negInf && y == negInf)
89 result = -3 * piOverFourDouble;
90 else
91 result = ::atan2(x, y);
92
93 return result;
94}
95#else // !BUILDING_KDE__
96
97#define wtf_atan2(x, y) atan2(x, y)
98
99#endif // !BUILDING_KDE__
100
101#if COMPILER(MSVC)
102
103// Work around a bug in the Microsoft CRT, where fmod(x, +-infinity) yields NaN instead of x.
104inline double wtf_fmod(double x, double y) { return (!isinf(x) && isinf(y)) ? x : fmod(x, y); }
105
106#define fmod(x, y) wtf_fmod(x, y)
107
108#endif // #if COMPILER(MSVC)
109
110#define atan2(x, y) wtf_atan2(x, y)
111
112#endif // #if PLATFORM(WIN)
113
114inline double deg2rad(double d) { return d * piDouble / 180.0; }
115inline double rad2deg(double r) { return r * 180.0 / piDouble; }
116inline double deg2grad(double d) { return d * 400.0 / 360.0; }
117inline double grad2deg(double g) { return g * 360.0 / 400.0; }
118inline double rad2grad(double r) { return r * 200.0 / piDouble; }
119inline double grad2rad(double g) { return g * piDouble / 200.0; }
120
121inline float deg2rad(float d) { return d * piFloat / 180.0f; }
122inline float rad2deg(float r) { return r * 180.0f / piFloat; }
123inline float deg2grad(float d) { return d * 400.0f / 360.0f; }
124inline float grad2deg(float g) { return g * 360.0f / 400.0f; }
125inline float rad2grad(float r) { return r * 200.0f / piFloat; }
126inline float grad2rad(float g) { return g * piFloat / 200.0f; }
127
128#endif // #ifndef WTF_MathExtras_h
deg2rad
double deg2rad(double d)
Definition: MathExtras.h:114
grad2deg
double grad2deg(double g)
Definition: MathExtras.h:117
piOverFourDouble
const double piOverFourDouble
Definition: MathExtras.h:53
rad2grad
double rad2grad(double r)
Definition: MathExtras.h:118
piDouble
const double piDouble
Definition: MathExtras.h:45
rad2deg
double rad2deg(double r)
Definition: MathExtras.h:115
grad2rad
double grad2rad(double g)
Definition: MathExtras.h:119
piOverFourFloat
const float piOverFourFloat
Definition: MathExtras.h:54
deg2grad
double deg2grad(double d)
Definition: MathExtras.h:116
piFloat
const float piFloat
Definition: MathExtras.h:46
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