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/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WTF_MathExtras_h
#define WTF_MathExtras_h
#include <cmath>
#include <float.h>
#include <stdlib.h>
#if OS(SOLARIS)
#include <ieeefp.h>
#endif
#if OS(OPENBSD)
#include <sys/types.h>
#include <machine/ieee.h>
#endif
#if COMPILER(MSVC)
#if OS(WINCE)
#include <stdlib.h>
#endif
#include <limits>
#endif
#ifndef M_PI
const double piDouble = 3.14159265358979323846;
const float piFloat = 3.14159265358979323846f;
#else
const double piDouble = M_PI;
const float piFloat = static_cast<float>(M_PI);
#endif
#ifndef M_PI_4
const double piOverFourDouble = 0.785398163397448309616;
const float piOverFourFloat = 0.785398163397448309616f;
#else
const double piOverFourDouble = M_PI_4;
const float piOverFourFloat = static_cast<float>(M_PI_4);
#endif
#if OS(DARWIN)
// Work around a bug in the Mac OS X libc where ceil(-0.1) return +0.
inline double wtf_ceil(double x) { return copysign(ceil(x), x); }
#define ceil(x) wtf_ceil(x)
#endif
#if OS(SOLARIS)
#ifndef isfinite
inline bool isfinite(double x) { return finite(x) && !isnand(x); }
#endif
#ifndef isinf
inline bool isinf(double x) { return !finite(x) && !isnand(x); }
#endif
#ifndef signbit
inline bool signbit(double x) { return x < 0.0; } // FIXME: Wrong for negative 0.
#endif
#endif
#if OS(OPENBSD)
#ifndef isfinite
inline bool isfinite(double x) { return finite(x); }
#endif
#ifndef signbit
inline bool signbit(double x) { struct ieee_double *p = (struct ieee_double *)&x; return p->dbl_sign; }
#endif
#endif
#if COMPILER(MSVC) || COMPILER(RVCT)
// We must not do 'num + 0.5' or 'num - 0.5' because they can cause precision loss.
static double round(double num)
{
double integer = ceil(num);
if (num > 0)
return integer - num > 0.5 ? integer - 1.0 : integer;
return integer - num >= 0.5 ? integer - 1.0 : integer;
}
static float roundf(float num)
{
float integer = ceilf(num);
if (num > 0)
return integer - num > 0.5f ? integer - 1.0f : integer;
return integer - num >= 0.5f ? integer - 1.0f : integer;
}
inline long long llround(double num) { return static_cast<long long>(round(num)); }
inline long long llroundf(float num) { return static_cast<long long>(roundf(num)); }
inline long lround(double num) { return static_cast<long>(round(num)); }
inline long lroundf(float num) { return static_cast<long>(roundf(num)); }
inline double trunc(double num) { return num > 0 ? floor(num) : ceil(num); }
#endif
#if COMPILER(MSVC)
inline long long abs(long long num) { return _abs64(num); }
inline bool isinf(double num) { return !_finite(num) && !_isnan(num); }
inline bool isnan(double num) { return !!_isnan(num); }
inline bool signbit(double num) { return _copysign(1.0, num) < 0; }
inline double nextafter(double x, double y) { return _nextafter(x, y); }
inline float nextafterf(float x, float y) { return x > y ? x - FLT_EPSILON : x + FLT_EPSILON; }
inline double copysign(double x, double y) { return _copysign(x, y); }
inline int isfinite(double x) { return _finite(x); }
// Work around a bug in Win, where atan2(+-infinity, +-infinity) yields NaN instead of specific values.
inline double wtf_atan2(double x, double y)
{
double posInf = std::numeric_limits<double>::infinity();
double negInf = -std::numeric_limits<double>::infinity();
double nan = std::numeric_limits<double>::quiet_NaN();
double result = nan;
if (x == posInf && y == posInf)
result = piOverFourDouble;
else if (x == posInf && y == negInf)
result = 3 * piOverFourDouble;
else if (x == negInf && y == posInf)
result = -piOverFourDouble;
else if (x == negInf && y == negInf)
result = -3 * piOverFourDouble;
else
result = ::atan2(x, y);
return result;
}
// Work around a bug in the Microsoft CRT, where fmod(x, +-infinity) yields NaN instead of x.
inline double wtf_fmod(double x, double y) { return (!isinf(x) && isinf(y)) ? x : fmod(x, y); }
// Work around a bug in the Microsoft CRT, where pow(NaN, 0) yields NaN instead of 1.
inline double wtf_pow(double x, double y) { return y == 0 ? 1 : pow(x, y); }
#define atan2(x, y) wtf_atan2(x, y)
#define fmod(x, y) wtf_fmod(x, y)
#define pow(x, y) wtf_pow(x, y)
#endif // COMPILER(MSVC)
inline double deg2rad(double d) { return d * piDouble / 180.0; }
inline double rad2deg(double r) { return r * 180.0 / piDouble; }
inline double deg2grad(double d) { return d * 400.0 / 360.0; }
inline double grad2deg(double g) { return g * 360.0 / 400.0; }
inline double turn2deg(double t) { return t * 360.0; }
inline double deg2turn(double d) { return d / 360.0; }
inline double rad2grad(double r) { return r * 200.0 / piDouble; }
inline double grad2rad(double g) { return g * piDouble / 200.0; }
inline float deg2rad(float d) { return d * piFloat / 180.0f; }
inline float rad2deg(float r) { return r * 180.0f / piFloat; }
inline float deg2grad(float d) { return d * 400.0f / 360.0f; }
inline float grad2deg(float g) { return g * 360.0f / 400.0f; }
inline float turn2deg(float t) { return t * 360.0f; }
inline float deg2turn(float d) { return d / 360.0f; }
inline float rad2grad(float r) { return r * 200.0f / piFloat; }
inline float grad2rad(float g) { return g * piFloat / 200.0f; }
#if !COMPILER(MSVC) && !COMPILER(RVCT) && !OS(ANDROID) && !COMPILER(WINSCW)
using std::isfinite;
using std::isinf;
using std::isnan;
using std::signbit;
#endif
#endif // #ifndef WTF_MathExtras_h
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