# Cppcheck report - LibreOffice: svtools/source/dialogs/mcvmath.cxx

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121

    /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
    /*
     * This file is part of the LibreOffice project.
     *
     * 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
     * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     *
     * This file incorporates work covered by the following license notice:
     *
     *   Licensed to the Apache Software Foundation (ASF) under one or more
     *   contributor license agreements. See the NOTICE file distributed
     *   with this work for additional information regarding copyright
     *   ownership. The ASF licenses this file to you under the Apache
     *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
     */

    #include "mcvmath.hxx"

    // die folgenden Tabellen enthalten     sin(phi) * 2**14
    // fuer phi= 360Grad*2**-32 bis 360 Grad
    // def. fuer x: phi=360Grad * 2**(x-16)
    //           d.h. x =  16 -> 360 Grad
    //                x = -16 -> (2**-16) * 360 Grad
    //         x:         -16 ... 0 ... 15
    //x=    0,     1,     2,     3,     4,     5,     6,      7,
    //      8,     9,    10,    11,    12,    13,    14,     15

    static const short CosTab[16] =
    {
        16384, 16384, 16384, 16384, 16384, 16384, 16384,  16383,
        16379, 16364, 16305, 16069, 15137, 11585,     0, -16383
    };
    static const short SinTab[16]=
    {
            2,     3,      6,    13,    25,     50,   101,  201,
          402,   804,   1606,  3196,  6270,  11585, 16384,    0
    };

    /**************************************************************************
    |*
    |*    ImpMultBig2()
    |*
    |*    Description       Multiplier for FixPoint-calculations
    |*
    **************************************************************************/

    //  first parameter should be the larger one

    Fix ImpMultBig2( const Fix& a, const Fix& b )<--- The function 'ImpMultBig2' is never used.
    {
        Fix f;
        f.x = (((b.x+FIX_A2)>>FIX_P2)*a.x+FIX_A3)>>FIX_P3;
        return f;
    }

    /**************************************************************************
    |*
    |*    ImpSqrt()
    |*
    |*    Description       SquareRoot function for FixPoint-calculations
    |*
    **************************************************************************/

    sal_uInt16 ImpSqrt( sal_uLong nRadi )<--- The function 'ImpSqrt' is never used.
    {
        sal_uLong  inf = 1;
        sal_uLong  sup = nRadi;
        sal_uLong sqr;

        if ( !nRadi )
            return 0;

        while ( (inf<<1) <= sup )
        {
            sup >>= 1;
            inf <<= 1;
        }
        sqr = (sup+inf) >> 1;               // startvalue for iteration

        sqr = (nRadi/sqr + sqr) >> 1;       // 2 Newton-Iterations suffice for
        sqr = (nRadi/sqr + sqr) >> 1;       // +- 1 Digit

        return sal::static_int_cast< sal_uInt16 >(sqr);
    }

    /**************************************************************************
    |*
    |*    ImpExPI()
    |*
    |*    Description       EXPI funktion or FixPoint-calculations
    |*
    **************************************************************************/

    // e**(i*nPhi), unit nPhi: 2**16 == 360 degrees

    FixCpx ImpExPI( sal_uInt16 nPhi )<--- The function 'ImpExPI' is never used.
    {
        short i;
        FixCpx aIter(1L);                   // e**(0*i)
        FixCpx Mul;
        const char Sft=14-FIX_POST;

        for ( i = 15; i >= 0; i-- )
        {
            if ( (1L<<i) & nPhi )
            {
                Mul.r.x = CosTab[i]>>Sft;   // e**(i(phi1+phi2)) =
                Mul.i.x = SinTab[i]>>Sft;   // e**(i*phi1)) * e**(i*phi2))
                aIter  *= Mul;
            }
        }

        return aIter;
    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */