/usr/include/geomview/MGRdolines.h is in libgeomview-dev 1.9.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | /* Copyright (C) 1992-1998 The Geometry Center
* Copyright (C) 1998-2000 Stuart Levy, Tamara Munzner, Mark Phillips
*
* This file is part of Geomview.
*
* Geomview is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* Geomview 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Geomview; see the file COPYING. If not, write
* to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA, or visit http://www.gnu.org.
*/
/* needed stuff:
NAME: name of function
GOURAUD: defined for smooth shade
ZBUFFER: defined for z-buffer code
COLOR: define for color
*/
#if defined(ZBUFFER)
#define ZCODE(x) x
#else
#define ZCODE(x)
#endif
#ifdef GOURAUD
#ifdef COLOR
#define GCODE(x)
#define CCODE(x) x
#else
#define GCODE(x) x
#define CCODE(x)
#endif
#define CGCODE(x) x
#else
#define CCODE(x)
#define GCODE(x)
#define CGCODE(x)
#endif
static void
NAME (unsigned char *buf, float *zbuf, int zwidth, int width,
int height, int miny, int maxy, int *color, endPoint *mug)
{
#ifdef PTR_INIT
PTR_TYPE *ptr; /* pixel pointers */
#endif
int i, x2; /* dithering junk */
int y, x1; /* current line */
#ifdef ZBUFFER
float *zptr; /* zbuff pointers */
double z, z2, zdelta; /* z-buffer stuff */
#endif
#if defined(ZBUFFER) || defined(GOURAUD)
int dx;
#endif
#ifdef GOURAUD
int sr, er, dr, r;
#ifdef COLOR
int sg, sb, eg, eb, dg, db, g, b;
#endif
#endif
#ifdef VARIABLES
VARIABLES
#endif
#ifdef INITCODE
INITCODE
#endif
for(y = miny; y <= maxy; y++)
{
x1 = mug[y].P1x;
ZCODE(z = mug[y].P1z;)
CGCODE(r = mug[y].P1r;)
CCODE(g = mug[y].P1g; b = mug[y].P1b;)
x2 = mug[y].P2x;
ZCODE(z2 = mug[y].P2z;)
CGCODE(dr = mug[y].P2r-r;)
CCODE(dg = mug[y].P2g-g; db = mug[y].P2b-b;)
#if defined(ZBUFFER) || defined(GOURAUD)
dx = x2-x1;
#endif
ZCODE(zdelta = dx ? (z2-z)/dx : 0;)
CGCODE(er = (dr << 1) - dx;
sr = SGN(dr); dr = abs(dr)<<1;)
CCODE(eg = (dg << 1) - dx;
eb = (db << 1) - dx;
sg = SGN(dg); dg = abs(dg)<<1;
sb = SGN(db); db = abs(db)<<1;)
CGCODE(dx <<= 1;)
#ifdef YCODE
YCODE
#endif
#ifdef PTR_INIT
ptr = PTR_INIT;
#endif
ZCODE(zptr = zbuf+zwidth*y+x1;)
for (i=x1; i<=x2; i++
#ifdef ZBUFFER
, z+=zdelta, zptr++
#endif
#ifdef PTR_INIT
, ptr++
#endif
)
{
#ifdef ZBUFFER
if (z < *zptr)
{
DOPIXEL
*zptr = z;
}
#else
DOPIXEL
#endif
#ifdef GOURAUD
if (dx)
{
while (er>0)
{
r += sr;
er -= dx;
}
#ifdef COLOR
while (eg>0)
{
g += sg;
eg -= dx;
}
while (eb>0)
{
b += sb;
eb -= dx;
}
#endif
}
#endif
CGCODE(er += dr;)
CCODE(eg += dg; eb += db;)
}
}
}
#undef ZCODE
#undef CCODE
#undef GCODE
#undef CGCODE
#undef NAME
#undef ZBUFFER
#undef GOURAUD
#undef COLOR
#undef PTR_TYPE
#undef PTR_INIT
#undef VARIABLES
#undef INITCODE
#undef YCODE
#undef DOPIXEL
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