/usr/include/crystalspace-2.0/csgeom/fixed.h is in libcrystalspace-dev 2.0+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2005 by Jorrit Tyberghein
2005 by Frank Richter
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_CSGEOM_FIXED_H__
#define __CS_CSGEOM_FIXED_H__
#include "csqint.h"
/**\file
* Fixed-point number classes.
*/
/**
* \addtogroup geom_utils
* @{ */
/**
* Encapsulation of a 16.16 fixed-point number.
* \todo More operators.
*/
class csFixed16
{
int32 v;
public:
csFixed16 () {}
csFixed16 (const float f) : v (csQfixed16 (f)) {}
/// Assign floating point number
csFixed16& operator= (const float f)
{
v = csQfixed16 (f);
return *this;
}
/// Subtract two fixed point numbers
inline friend csFixed16 operator- (const csFixed16& v1,
const csFixed16& v2)
{
csFixed16 v;
v.v = v1.v - v2.v;
return v;
}
/// Subtract a fixed point number from a float, result is fixed
inline friend csFixed16 operator- (float v1,
const csFixed16& v2)
{
csFixed16 v;
v.v = csQfixed16 (v1) - v2.v;
return v;
}
/// Subtract a float number from a fixed point, result is fixed
inline friend csFixed16 operator- (const csFixed16& v1,
float v2)
{
csFixed16 v;
v.v = v1.v - csQfixed16 (v2);
return v;
}
/// Multiply a fixed point number with a float, result is fixed
inline friend csFixed16 operator* (const csFixed16& v1,
float v2)
{
csFixed16 v;
v.v = (int32)(v1.v * v2);
return v;
}
/// Multiply a fixed point number with an int, result is fixed
inline friend csFixed16 operator* (const csFixed16& v1,
int v2)
{
csFixed16 v;
v.v = v1.v * v2;
return v;
}
/// Add a fixed point number to another
inline csFixed16& operator+= (const csFixed16& x)
{
v += x.v;
return *this;
}
/// Get integer part
inline operator int() const
{ return v >> 16; }
/// Get "raw" fixed point number
inline int32 GetFixed() const { return v; }
/// Shift right
inline friend csFixed16 operator>> (const csFixed16& v1, int n)
{
csFixed16 vn;
vn.v = v1.v >> n;
return vn;
}
};
/**
* Encapsulation of a 8.24 fixed-point number.
* \todo More operators.
*/
class csFixed24
{
int32 v;
public:
/// Assign floating point number
csFixed24& operator= (float f)
{
v = csQfixed24 (f);
return *this;
}
/// Subtract two fixed point numbers
inline friend csFixed24 operator- (const csFixed24& v1,
const csFixed24& v2)
{
csFixed24 v;
v.v = v1.v - v2.v;
return v;
}
/// Subtract a fixed point number from a float, result is fixed
inline friend csFixed24 operator- (float v1,
const csFixed24& v2)
{
csFixed24 v;
v.v = csQfixed24 (v1) - v2.v;
return v;
}
/// Subtract a float number from a fixed point, result is fixed
inline friend csFixed24 operator- (const csFixed24& v1,
float v2)
{
csFixed24 v;
v.v = v1.v - csQfixed24 (v2);
return v;
}
/// Multiply a fixed point number with a float, result is fixed
inline friend csFixed24 operator* (const csFixed24& v1,
float v2)
{
csFixed24 v;
v.v = (int32)(v1.v * v2);
return v;
}
/// Add a fixed point number to another
inline csFixed24& operator+= (const csFixed24& x)
{
v += x.v;
return *this;
}
/// Get integer part
inline operator int() const
{ return v >> 16; }
/// Get "raw" fixed point number
inline int32 GetFixed() const { return v; }
};
/** @} */
#endif // __CS_CSGEOM_FIXED_H__
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