/usr/include/geomview/MGRline.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 | /* 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.
*/
#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
WIDENAME (unsigned char *buf, float *zbuf, int zwidth, int width, int height,
int x1, int y1,
#ifdef ZBUFFER
double z1,
#endif
#ifdef GOURAUD
int r1,
#ifdef COLOR
int g1, int b1,
#endif
#endif
int x2, int y2,
#ifdef ZBUFFER
double z2,
#endif
#ifdef GOURAUD
int r2,
#ifdef COLOR
int g2, int b2,
#endif
#endif
int lwidth, int *color)
{
int d, x, y, ax, ay, sx, dx, dy;
int i, end;
#ifdef ZBUFFER
double delta=0, z;
#endif
#ifdef GOURAUD
double r, rdelta;
#ifdef COLOR
double g, b, gdelta, bdelta;
#endif
#endif
#if defined(ZBUFFER) || defined(GOURAUD)
int total;
#endif
#ifdef PTR_INIT
PTR_TYPE *ptr = (PTR_TYPE *)buf;
int ptrIncr = PTR_INCR;
#endif
#ifdef VARIABLES
VARIABLES
#endif
dx = x2-x1;
dy = y2-y1;
ax = ABS(dx)<<1;
ay = ABS(dy)<<1;
sx = SGN(dx);
x = x1;
y = y1;
ZCODE(z = z1;)
CGCODE(r = r1;)
CCODE(g = g1; b = b1;)
#if defined(ZBUFFER) || defined(GOURAUD)
total = ABS(dx)+ABS(dy);
if(total == 0) total = 1;
#endif
ZCODE(delta = (z2-z1)/total;)
CGCODE(rdelta = (r2-r1)/(double)total;)
CCODE(gdelta = (g2-g1)/(double)total;
bdelta = (b2-b1)/(double)total;)
if (ax>ay)
{ /* x dominant */
d = ay-(ax>>1);
for (;;)
{
for (i=MAX(0,y-lwidth/2), end=MIN(height,y-lwidth/2+lwidth); i<end; i++)
{
#ifdef ZBUFFER
if (z<zbuf[i*zwidth+x])
{
WIDEYDOPIXEL
zbuf[i*zwidth+x] = z;
}
#else
WIDEYDOPIXEL
#endif
}
if (x==x2) break;
if (d>=0)
{
y++;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
d -= ax;
}
x += sx;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
d += ay;
}
}
else
{ /* y dominant */
d = ax-(ay>>1);
for (;;)
{
for (i=MAX(0,x-lwidth/2), end=MIN(zwidth,x-lwidth/2+lwidth); i<end; i++)
{
#ifdef ZBUFFER
if (z<zbuf[y*zwidth+i])
{
WIDEXDOPIXEL
zbuf[y*zwidth+i] = z;
}
#else
WIDEXDOPIXEL
#endif
}
if (y==y2) break;
if (d>=0)
{
x += sx;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
d -= ay;
}
y++;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
d += ax;
}
}
}
void
NAME (unsigned char *buf, float *zbuf, int zwidth,
int width, int height, CPoint3 *p1, CPoint3 *p2, int lwidth, int *color)
{
int d, x, y, ax, ay, sx, dx, dy;
int x1, y1, x2, y2;
#ifdef PTR_INIT
PTR_TYPE *ptr;
int ptrIncr = PTR_INCR;
#endif
#ifdef ZBUFFER
float *zptr;
double delta=0, z, z1, z2;
#endif
#ifdef GOURAUD
int r1, r2;
double r, rdelta;
#ifdef COLOR
int g1, g2, b1, b2;
double g, b, gdelta, bdelta;
#endif
#endif
#if defined(ZBUFFER) || defined(GOURAUD)
int total;
#endif
#ifdef VARIABLES
VARIABLES
#endif
if (p2->y<p1->y)
{
x1 = p2->x; y1 = p2->y;
x2 = p1->x; y2 = p1->y;
ZCODE(z1 = p2->z - _mgc->zfnudge; z2 = p1->z - _mgc->zfnudge;)
CGCODE(r1 = 255*p2->vcol.r; r2 = 255*p1->vcol.r;)
CCODE(g1 = 255*p2->vcol.g; b1 = 255*p2->vcol.b;
g2 = 255*p1->vcol.g; b2 = 255*p1->vcol.b;)
}
else
{
x1 = p1->x; y1 = p1->y;
x2 = p2->x; y2 = p2->y;
ZCODE(z1 = p1->z - _mgc->zfnudge; z2 = p2->z - _mgc->zfnudge;)
CGCODE(r1 = 255*p1->vcol.r; r2 = 255*p2->vcol.r;)
CCODE(g1 = 255*p1->vcol.g; b1 = 255*p1->vcol.b;
g2 = 255*p2->vcol.g; b2 = 255*p2->vcol.b;)
}
if (lwidth > 1)
{
WIDENAME (buf, zbuf, zwidth, width, height, x1, y1,
#ifdef ZBUFFER
z1,
#endif
#ifdef GOURAUD
r1,
#ifdef COLOR
g1, b1,
#endif
#endif
x2, y2,
#ifdef ZBUFFER
z2,
#endif
#ifdef GOURAUD
r2,
#ifdef COLOR
g2, b2,
#endif
#endif
lwidth, color);
return;
}
#ifdef PTR_INIT
ptr = PTR_INIT;
#endif
ZCODE(zptr = zbuf+y1*zwidth+x1;)
dx = x2-x1;
dy = y2-y1;
ax = ABS(dx)<<1;
ay = ABS(dy)<<1;
sx = SGN(dx);
x = x1;
y = y1;
ZCODE(z = z1;)
CGCODE(r = r1;)
CCODE(g = g1; b = b1;)
#if defined(ZBUFFER) || defined(GOURAUD)
total = ABS(dx)+ABS(dy);
if(total == 0) total = 1;
#endif
ZCODE(delta = (z2-z1)/total;)
CGCODE(rdelta = (r2-r1)/(double)total;)
CCODE(gdelta = (g2-g1)/(double)total;
bdelta = (b2-b1)/(double)total;)
if (ax>ay)
{ /* x dominant */
d = ay-(ax>>1);
for (;;)
{
#ifdef ZBUFFER
if (z<*zptr)
{
DOPIXEL
*zptr = z;
}
#else
DOPIXEL
#endif
if (x==x2) break;
if (d>=0)
{
y++;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
#ifdef PTR_INIT
ptr += ptrIncr;
#endif
ZCODE(zptr += zwidth;)
d -= ax;
}
x += sx;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
#ifdef PTR_INIT
ptr += sx;
#endif
ZCODE(zptr += sx;)
d += ay;
}
}
else
{ /* y dominant */
d = ax-(ay>>1);
for (;;)
{
#ifdef ZBUFFER
if (z<*zptr)
{
DOPIXEL
ZCODE(*zptr = z;)
}
#else
DOPIXEL
#endif
if (y==y2) break;
if (d>=0)
{
x += sx;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
#ifdef PTR_INIT
ptr += sx;
#endif
ZCODE(zptr += sx;)
d -= ay;
}
y++;
ZCODE(z += delta;)
CGCODE(r += rdelta;)
CCODE(g += gdelta; b += bdelta;)
#ifdef PTR_INIT
ptr += ptrIncr;
#endif
ZCODE(zptr += zwidth;)
d += ax;
}
}
}
#undef ZCODE
#undef CCODE
#undef GCODE
#undef CGCODE
#undef WIDENAME
#undef NAME
#undef ZBUFFER
#undef GOURAUD
#undef COLOR
#undef PTR_TYPE
#undef PTR_INIT
#undef PTR_INCR
#undef VARIABLES
#undef DOPIXEL
#undef WIDEXDOPIXEL
#undef WIDEYDOPIXEL
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