Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <resourcemodel/Fraction.hxx>
      21             : 
      22             : namespace writerfilter {
      23             : namespace resourcemodel {
      24             : 
      25           0 : sal_uInt32 gcd(sal_uInt32 a, sal_uInt32 b)
      26             : {
      27           0 :     if (a == 0 || b == 0)
      28           0 :         return a | b;
      29             : 
      30           0 :     sal_uInt32 nShift = 0;
      31           0 :     while (((a | b) & 1) == 0)
      32             :     {
      33           0 :         a >>= 1;
      34           0 :         b >>= 1;
      35           0 :         ++nShift;
      36             :     }
      37             : 
      38           0 :     while ((a & 1) == 0)
      39           0 :         a >>= 1;
      40             : 
      41           0 :     do
      42             :     {
      43           0 :         while ((b & 1) == 0)
      44           0 :             b >>= 1;
      45             : 
      46           0 :         if (a < b)
      47             :         {
      48           0 :             b -= a;
      49             :         }
      50             :         else
      51             :         {
      52           0 :             sal_uInt32 nDiff = a - b;
      53           0 :             a = b;
      54           0 :             b = nDiff;
      55             :         }
      56             : 
      57           0 :         b >>= 1;
      58             :     }
      59             :     while (b != 0);
      60             : 
      61           0 :     return a << nShift;
      62             : }
      63             : 
      64           0 : sal_uInt32 lcm(sal_Int32 a, sal_Int32 b)
      65             : {
      66           0 :     return abs(a * b) / gcd(abs(a), abs(b));
      67             : }
      68             : 
      69           0 : Fraction::Fraction(sal_Int32 nNumerator, sal_Int32 nDenominator)
      70             : {
      71           0 :     init(nNumerator, nDenominator);
      72           0 : }
      73             : 
      74           0 : Fraction::~Fraction()
      75             : {
      76           0 : }
      77             : 
      78           0 : void Fraction::init(sal_Int32 nNumerator, sal_Int32 nDenominator)
      79             : {
      80           0 :     sal_uInt32 nGCD = gcd(nNumerator, nDenominator);
      81             : 
      82           0 :     mnNumerator = nNumerator/ nGCD;
      83           0 :     mnDenominator = nDenominator / nGCD;
      84           0 : }
      85             : 
      86           0 : void Fraction::assign(const Fraction & rFraction)
      87             : {
      88           0 :     init(rFraction.mnNumerator, rFraction.mnDenominator);
      89           0 : }
      90             : 
      91           0 : Fraction Fraction::inverse() const
      92             : {
      93           0 :     return Fraction(mnDenominator, mnNumerator);
      94             : }
      95             : 
      96           0 : Fraction Fraction::operator + (const Fraction & rFraction) const
      97             : {
      98           0 :     sal_uInt32 nLCM = lcm(mnDenominator, rFraction.mnDenominator);
      99             : 
     100           0 :     return Fraction(mnNumerator * nLCM / mnDenominator + rFraction.mnNumerator * nLCM / rFraction.mnDenominator, nLCM);
     101             : }
     102             : 
     103           0 : Fraction Fraction::operator - (const Fraction & rFraction) const
     104             : {
     105           0 :     sal_uInt32 nLCM = lcm(mnDenominator, rFraction.mnDenominator);
     106             : 
     107           0 :     return Fraction(mnNumerator * nLCM / mnDenominator - rFraction.mnNumerator * nLCM / rFraction.mnDenominator, nLCM);
     108             : }
     109             : 
     110           0 : Fraction Fraction::operator * (const Fraction & rFraction) const
     111             : {
     112           0 :     return Fraction(mnNumerator * rFraction.mnNumerator, mnDenominator * rFraction.mnDenominator);
     113             : }
     114             : 
     115           0 : Fraction Fraction::operator / (const Fraction & rFraction) const
     116             : {
     117           0 :     return *this * rFraction.inverse();
     118             : }
     119             : 
     120           0 : Fraction Fraction::operator = (const Fraction & rFraction)
     121             : {
     122           0 :     assign(rFraction);
     123             : 
     124           0 :     return *this;
     125             : }
     126             : 
     127           0 : Fraction::operator sal_Int32() const
     128             : {
     129           0 :     return mnNumerator / mnDenominator;
     130             : }
     131             : 
     132           0 : Fraction::operator float() const
     133             : {
     134           0 :     return static_cast<float>(mnNumerator) / static_cast<float>(mnDenominator);
     135             : }
     136             : 
     137             : }}
     138             : 
     139             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */