LCOV - app.info - objdir/dist/include/nsMathUtils.h

LCOV - code coverage report
| Current view: | directory - objdir/dist/include - nsMathUtils.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 12 | 0 | 0.0 %
| Date: | 2012-04-21 | Functions: | 6 | 0 | 0.0 %

           1                 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  * ***** BEGIN LICENSE BLOCK *****
           3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           4                 :  *
           5                 :  * The contents of this file are subject to the Mozilla Public License Version
           6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           7                 :  * the License. You may obtain a copy of the License at
           8                 :  * http://www.mozilla.org/MPL/
           9                 :  *
          10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          12                 :  * for the specific language governing rights and limitations under the
          13                 :  * License.
          14                 :  *
          15                 :  * The Original Code is Mozilla Foundation code.
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
          18                 :  * Portions created by the Initial Developer are Copyright (C) 2007
          19                 :  * the Initial Developer. All Rights Reserved.
          20                 :  *
          21                 :  * Contributor(s):
          22                 :  *   Stuart Parmenter <stuart@mozilla.com>
          23                 :  *
          24                 :  * Alternatively, the contents of this file may be used under the terms of
          25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          28                 :  * of those above. If you wish to allow use of your version of this file only
          29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          30                 :  * use your version of this file under the terms of the MPL, indicate your
          31                 :  * decision by deleting the provisions above and replace them with the notice
          32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          33                 :  * the provisions above, a recipient may use your version of this file under
          34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          35                 :  *
          36                 :  * ***** END LICENSE BLOCK ***** */
          37                 :
          38                 : #ifndef nsMathUtils_h__
          39                 : #define nsMathUtils_h__
          40                 :
          41                 : #define _USE_MATH_DEFINES /* needed for M_ constants on Win32 */
          42                 :
          43                 : #include "nscore.h"
          44                 : #include <cmath>
          45                 : #include <float.h>
          46                 :
          47                 : #ifdef SOLARIS
          48                 : #include <ieeefp.h>
          49                 : #endif
          50                 :
          51                 : /*
          52                 :  * round
          53                 :  */
          54               0 : inline NS_HIDDEN_(double) NS_round(double x)
          55                 : {
          56               0 :     return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5);
          57                 : }
          58               0 : inline NS_HIDDEN_(float) NS_roundf(float x)
          59                 : {
          60               0 :     return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
          61                 : }
          62               0 : inline NS_HIDDEN_(PRInt32) NS_lround(double x)
          63                 : {
          64               0 :     return x >= 0.0 ? PRInt32(x + 0.5) : PRInt32(x - 0.5);
          65                 : }
          66                 :
          67                 : /* NS_roundup30 rounds towards infinity for positive and       */
          68                 : /* negative numbers.                                           */
          69                 :
          70                 : #if defined(XP_WIN32) && defined(_M_IX86) && !defined(__GNUC__)
          71                 : inline NS_HIDDEN_(PRInt32) NS_lroundup30(float x)
          72                 : {
          73                 :     /* Code derived from Laurent de Soras' paper at             */
          74                 :     /* http://ldesoras.free.fr/doc/articles/rounding_en.pdf     */
          75                 :
          76                 :     /* Rounding up on Windows is expensive using the float to   */
          77                 :     /* int conversion and the floor function. A faster          */
          78                 :     /* approach is to use f87 rounding while assuming the       */
          79                 :     /* default rounding mode of rounding to the nearest         */
          80                 :     /* integer. This rounding mode, however, actually rounds    */
          81                 :     /* to the nearest integer so we add the floating point      */
          82                 :     /* number to itself and add our rounding factor before      */
          83                 :     /* doing the conversion to an integer. We then do a right   */
          84                 :     /* shift of one bit on the integer to divide by two.        */
          85                 :
          86                 :     /* This routine doesn't handle numbers larger in magnitude  */
          87                 :     /* than 2^30 but this is fine for NSToCoordRound because    */
          88                 :     /* Coords are limited to 2^30 in magnitude.                 */
          89                 :
          90                 :     static const double round_to_nearest = 0.5f;
          91                 :     int i;
          92                 :
          93                 :     __asm {
          94                 :       fld     x                   ; load fp argument
          95                 :       fadd    st, st(0)           ; double it
          96                 :       fadd    round_to_nearest    ; add the rounding factor
          97                 :       fistp   dword ptr i         ; convert the result to int
          98                 :     }
          99                 :     return i >> 1;                /* divide by 2 */
         100                 : }
         101                 : #endif /* XP_WIN32 && _M_IX86 && !__GNUC__ */
         102                 :
         103               0 : inline NS_HIDDEN_(PRInt32) NS_lroundf(float x)
         104                 : {
         105               0 :     return x >= 0.0f ? PRInt32(x + 0.5f) : PRInt32(x - 0.5f);
         106                 : }
         107                 :
         108                 : /*
         109                 :  * hypot.  We don't need a super accurate version of this, if a platform
         110                 :  * turns up with none of the possibilities below it would be okay to fall
         111                 :  * back to sqrt(x*x + y*y).
         112                 :  */
         113               0 : inline NS_HIDDEN_(double) NS_hypot(double x, double y)
         114                 : {
         115                 : #if __GNUC__ >= 4
         116               0 :     return __builtin_hypot(x, y);
         117                 : #elif defined _WIN32
         118                 :     return _hypot(x, y);
         119                 : #else
         120                 :     return hypot(x, y);
         121                 : #endif
         122                 : }
         123                 :
         124                 : /**
         125                 :  * Check whether a floating point number is finite (not +/-infinity and not a
         126                 :  * NaN value).
         127                 :  */
         128               0 : inline NS_HIDDEN_(bool) NS_finite(double d)
         129                 : {
         130                 : #ifdef WIN32
         131                 :     // NOTE: '!!' casts an int to bool without spamming MSVC warning C4800.
         132                 :     return !!_finite(d);
         133                 : #elif defined(XP_DARWIN)
         134                 :     // Darwin has deprecated |finite| and recommends |isfinite|. The former is
         135                 :     // not present in the iOS SDK.
         136                 :     return std::isfinite(d);
         137                 : #else
         138               0 :     return finite(d);
         139                 : #endif
         140                 : }
         141                 :
         142                 : #endif

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