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: 2012-06-02 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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