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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#ifndef nsMathUtils_h_
#define nsMathUtils_h_
#include "nscore.h"
#include <cmath>
#include <float.h>
#if defined(XP_SOLARIS)
# include <ieeefp.h>
#endif
/*
* round
*/
inline double NS_round(double aNum) {
return aNum >= 0.0 ? floor(aNum + 0.5) : ceil(aNum - 0.5);
}
inline float NS_roundf(float aNum) {
return aNum >= 0.0f ? floorf(aNum + 0.5f) : ceilf(aNum - 0.5f);
}
inline int32_t NS_lround(double aNum) {
return aNum >= 0.0 ? int32_t(aNum + 0.5) : int32_t(aNum - 0.5);
}
inline int32_t NS_lroundf(float aNum) {
return aNum >= 0.0f ? int32_t(aNum + 0.5f) : int32_t(aNum - 0.5f);
}
/*
* hypot. We don't need a super accurate version of this, if a platform
* turns up with none of the possibilities below it would be okay to fall
* back to sqrt(x*x + y*y).
*/
inline double NS_hypot(double aNum1, double aNum2) {
#ifdef __GNUC__
return __builtin_hypot(aNum1, aNum2);
#elif defined _WIN32
return _hypot(aNum1, aNum2);
#else
return hypot(aNum1, aNum2);
#endif
}
/**
* Returns the result of the modulo of x by y using a floored division.
* fmod(x, y) is using a truncated division.
* The main difference is that the result of this method will have the sign of
* y while the result of fmod(x, y) will have the sign of x.
*/
inline double NS_floorModulo(double aNum1, double aNum2) {
return (aNum1 - aNum2 * floor(aNum1 / aNum2));
}
#endif