/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Foundation code. * * The Initial Developer of the Original Code is Mozilla Foundation. * Portions created by the Initial Developer are Copyright (C) 2007 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Stuart Parmenter * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef nsMathUtils_h__ #define nsMathUtils_h__ #define _USE_MATH_DEFINES /* needed for M_ constants on Win32 */ #include "nscore.h" #include #include #ifdef SOLARIS #include #endif /* * round */ inline NS_HIDDEN_(double) NS_round(double x) { return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5); } inline NS_HIDDEN_(float) NS_roundf(float x) { return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f); } inline NS_HIDDEN_(PRInt32) NS_lround(double x) { return x >= 0.0 ? PRInt32(x + 0.5) : PRInt32(x - 0.5); } /* NS_roundup30 rounds towards infinity for positive and */ /* negative numbers. */ #if defined(XP_WIN32) && defined(_M_IX86) && !defined(__GNUC__) inline NS_HIDDEN_(PRInt32) NS_lroundup30(float x) { /* Code derived from Laurent de Soras' paper at */ /* http://ldesoras.free.fr/doc/articles/rounding_en.pdf */ /* Rounding up on Windows is expensive using the float to */ /* int conversion and the floor function. A faster */ /* approach is to use f87 rounding while assuming the */ /* default rounding mode of rounding to the nearest */ /* integer. This rounding mode, however, actually rounds */ /* to the nearest integer so we add the floating point */ /* number to itself and add our rounding factor before */ /* doing the conversion to an integer. We then do a right */ /* shift of one bit on the integer to divide by two. */ /* This routine doesn't handle numbers larger in magnitude */ /* than 2^30 but this is fine for NSToCoordRound because */ /* Coords are limited to 2^30 in magnitude. */ static const double round_to_nearest = 0.5f; int i; __asm { fld x ; load fp argument fadd st, st(0) ; double it fadd round_to_nearest ; add the rounding factor fistp dword ptr i ; convert the result to int } return i >> 1; /* divide by 2 */ } #endif /* XP_WIN32 && _M_IX86 && !__GNUC__ */ inline NS_HIDDEN_(PRInt32) NS_lroundf(float x) { return x >= 0.0f ? PRInt32(x + 0.5f) : PRInt32(x - 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 NS_HIDDEN_(double) NS_hypot(double x, double y) { #if __GNUC__ >= 4 return __builtin_hypot(x, y); #elif defined _WIN32 return _hypot(x, y); #else return hypot(x, y); #endif } /** * Check whether a floating point number is finite (not +/-infinity and not a * NaN value). */ inline NS_HIDDEN_(bool) NS_finite(double d) { #ifdef WIN32 // NOTE: '!!' casts an int to bool without spamming MSVC warning C4800. return !!_finite(d); #elif defined(XP_DARWIN) // Darwin has deprecated |finite| and recommends |isfinite|. The former is // not present in the iOS SDK. return std::isfinite(d); #else return finite(d); #endif } #endif