| 1 |
/* Copyright (c) 1992 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* rpict.c - routines and variables for picture generation. |
| 9 |
* |
| 10 |
* 8/14/85 |
| 11 |
*/ |
| 12 |
|
| 13 |
#include "ray.h" |
| 14 |
|
| 15 |
#ifdef BSD |
| 16 |
#include <sys/time.h> |
| 17 |
#include <sys/resource.h> |
| 18 |
#endif |
| 19 |
|
| 20 |
#include <signal.h> |
| 21 |
#include <fcntl.h> |
| 22 |
|
| 23 |
#include "view.h" |
| 24 |
|
| 25 |
#include "resolu.h" |
| 26 |
|
| 27 |
#include "random.h" |
| 28 |
|
| 29 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
| 30 |
int ndims = 0; /* number of sampling dimensions */ |
| 31 |
int samplendx; /* sample index number */ |
| 32 |
|
| 33 |
VIEW ourview = STDVIEW; /* view parameters */ |
| 34 |
int hresolu = 512; /* horizontal resolution */ |
| 35 |
int vresolu = 512; /* vertical resolution */ |
| 36 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
| 37 |
|
| 38 |
int psample = 4; /* pixel sample size */ |
| 39 |
double maxdiff = .05; /* max. difference for interpolation */ |
| 40 |
double dstrpix = 0.67; /* square pixel distribution */ |
| 41 |
|
| 42 |
double dstrsrc = 0.0; /* square source distribution */ |
| 43 |
double shadthresh = .05; /* shadow threshold */ |
| 44 |
double shadcert = .5; /* shadow certainty */ |
| 45 |
int directrelay = 1; /* number of source relays */ |
| 46 |
int vspretest = 512; /* virtual source pretest density */ |
| 47 |
int directinvis = 0; /* sources invisible? */ |
| 48 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
| 49 |
|
| 50 |
double specthresh = .15; /* specular sampling threshold */ |
| 51 |
double specjitter = 1.; /* specular sampling jitter */ |
| 52 |
|
| 53 |
int maxdepth = 6; /* maximum recursion depth */ |
| 54 |
double minweight = 5e-3; /* minimum ray weight */ |
| 55 |
|
| 56 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
| 57 |
double ambacc = 0.2; /* ambient accuracy */ |
| 58 |
int ambres = 32; /* ambient resolution */ |
| 59 |
int ambdiv = 128; /* ambient divisions */ |
| 60 |
int ambssamp = 0; /* ambient super-samples */ |
| 61 |
int ambounce = 0; /* ambient bounces */ |
| 62 |
char *amblist[128]; /* ambient include/exclude list */ |
| 63 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
| 64 |
|
| 65 |
int ralrm = 0; /* seconds between reports */ |
| 66 |
|
| 67 |
double pctdone = 0.0; /* percentage done */ |
| 68 |
|
| 69 |
long tlastrept = 0L; /* time at last report */ |
| 70 |
|
| 71 |
extern long time(); |
| 72 |
extern long tstart; /* starting time */ |
| 73 |
|
| 74 |
extern long nrays; /* number of rays traced */ |
| 75 |
|
| 76 |
#define MAXDIV 16 /* maximum sample size */ |
| 77 |
|
| 78 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
| 79 |
|
| 80 |
#define RFTEMPLATE "rfXXXXXX" |
| 81 |
#define HFTEMPLATE "/tmp/hfXXXXXX" |
| 82 |
|
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static char *hfname = NULL; /* header file name */ |
| 84 |
static FILE *hfp = NULL; /* header file pointer */ |
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|
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static int hres, vres; /* resolution for this frame */ |
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|
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extern char *mktemp(); |
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|
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double pixvalue(); |
| 91 |
|
| 92 |
|
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quit(code) /* quit program */ |
| 94 |
int code; |
| 95 |
{ |
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if (code) /* report status */ |
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report(); |
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if (hfname != NULL) { /* delete header file */ |
| 99 |
if (hfp != NULL) |
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fclose(hfp); |
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unlink(hfname); |
| 102 |
} |
| 103 |
exit(code); |
| 104 |
} |
| 105 |
|
| 106 |
|
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#ifdef BSD |
| 108 |
report() /* report progress */ |
| 109 |
{ |
| 110 |
struct rusage rubuf; |
| 111 |
double t; |
| 112 |
|
| 113 |
getrusage(RUSAGE_SELF, &rubuf); |
| 114 |
t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
| 115 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
| 116 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
| 117 |
t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
| 118 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
| 119 |
|
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
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nrays, pctdone, t/3600.0); |
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eputs(errmsg); |
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tlastrept = time((long *)0); |
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} |
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#else |
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report() /* report progress */ |
| 127 |
{ |
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tlastrept = time((long *)0); |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n", |
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nrays, pctdone, (tlastrept-tstart)/3600.0); |
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eputs(errmsg); |
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signal(SIGALRM, report); |
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} |
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#endif |
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|
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|
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openheader() /* save standard output to header file */ |
| 138 |
{ |
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hfname = mktemp(HFTEMPLATE); |
| 140 |
if (freopen(hfname, "w", stdout) == NULL) { |
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sprintf(errmsg, "cannot open header file \"%s\"", hfname); |
| 142 |
error(SYSTEM, errmsg); |
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} |
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} |
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|
| 146 |
|
| 147 |
closeheader() /* done with header output */ |
| 148 |
{ |
| 149 |
if (hfname == NULL) |
| 150 |
return; |
| 151 |
if (fflush(stdout) == EOF || (hfp = fopen(hfname, "r")) == NULL) |
| 152 |
error(SYSTEM, "error reopening header file"); |
| 153 |
} |
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|
| 155 |
|
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dupheader() /* repeat header on standard output */ |
| 157 |
{ |
| 158 |
register int c; |
| 159 |
|
| 160 |
if (fseek(hfp, 0L, 0) < 0) |
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error(SYSTEM, "seek error on header file"); |
| 162 |
while ((c = getc(hfp)) != EOF) |
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putchar(c); |
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} |
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|
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|
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rpict(seq, pout, zout, prvr) /* generate image(s) */ |
| 168 |
int seq; |
| 169 |
char *pout, *zout, *prvr; |
| 170 |
/* |
| 171 |
* If seq is greater than zero, then we will render a sequence of |
| 172 |
* images based on view parameter strings read from the standard input. |
| 173 |
* If pout is NULL, then all images will be sent to the standard ouput. |
| 174 |
* If seq is greater than zero and prvr is an integer, then it is the |
| 175 |
* frame number at which rendering should begin. Preceeding view parameter |
| 176 |
* strings will be skipped in the input. |
| 177 |
* If pout and prvr are the same, prvr is renamed to avoid overwriting. |
| 178 |
* Note that pout and zout should contain %d format specifications for |
| 179 |
* sequenced file naming. |
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*/ |
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{ |
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extern char *rindex(), *strncpy(), *strcat(); |
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char fbuf[128], fbuf2[128]; |
| 184 |
register char *cp; |
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RESOLU rs; |
| 186 |
double pa; |
| 187 |
/* finished writing header */ |
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closeheader(); |
| 189 |
/* check sampling */ |
| 190 |
if (psample < 1) |
| 191 |
psample = 1; |
| 192 |
else if (psample > MAXDIV) { |
| 193 |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
| 194 |
psample, MAXDIV); |
| 195 |
error(WARNING, errmsg); |
| 196 |
psample = MAXDIV; |
| 197 |
} |
| 198 |
/* get starting frame */ |
| 199 |
if (seq <= 0) |
| 200 |
seq = 0; |
| 201 |
else if (prvr != NULL && isint(prvr)) { |
| 202 |
register int rn; /* skip to specified view */ |
| 203 |
if ((rn = atoi(prvr)) < seq) |
| 204 |
error(USER, "recover frame less than start frame"); |
| 205 |
if (pout == NULL) |
| 206 |
error(USER, "missing output file specification"); |
| 207 |
for ( ; seq < rn; seq++) |
| 208 |
if (nextview(stdin) == EOF) |
| 209 |
error(USER, "unexpected EOF on view input"); |
| 210 |
prvr = fbuf; /* mark for renaming */ |
| 211 |
} |
| 212 |
if (pout != NULL) { |
| 213 |
sprintf(fbuf, pout, seq); |
| 214 |
if (!strcmp(prvr, fbuf)) { /* rename recover file */ |
| 215 |
fbuf2[0] = '\0'; |
| 216 |
if ((cp = rindex(fbuf, '/')) != NULL) |
| 217 |
strncpy(fbuf2, fbuf, cp-fbuf+1); |
| 218 |
strcat(fbuf2, RFTEMPLATE); |
| 219 |
prvr = mktemp(fbuf2); |
| 220 |
if (rename(fbuf, prvr) < 0 && errno != ENOENT) { |
| 221 |
sprintf(errmsg, |
| 222 |
"cannot rename \"%s\" to \"%s\"", |
| 223 |
fbuf, prvr); |
| 224 |
error(SYSTEM, errmsg); |
| 225 |
} |
| 226 |
} |
| 227 |
} |
| 228 |
/* render sequence */ |
| 229 |
do { |
| 230 |
if (seq && nextview(stdin) == EOF) |
| 231 |
break; |
| 232 |
if (pout != NULL) { |
| 233 |
sprintf(fbuf, pout, seq); |
| 234 |
if (freopen(fbuf, "w", stdout) == NULL) { |
| 235 |
sprintf(errmsg, |
| 236 |
"cannot open output file \"%s\"", fbuf); |
| 237 |
error(SYSTEM, errmsg); |
| 238 |
} |
| 239 |
dupheader(); |
| 240 |
} |
| 241 |
hres = hresolu; vres = vresolu; pa = pixaspect; |
| 242 |
if (prvr != NULL) |
| 243 |
if (viewfile(prvr, &ourview, &rs) <= 0 |
| 244 |
|| rs.or != PIXSTANDARD) { |
| 245 |
sprintf(errmsg, |
| 246 |
"cannot recover view parameters from \"%s\"", prvr); |
| 247 |
error(WARNING, errmsg); |
| 248 |
} else { |
| 249 |
pa = 0.0; |
| 250 |
hres = scanlen(&rs); |
| 251 |
vres = numscans(&rs); |
| 252 |
} |
| 253 |
if ((cp = setview(&ourview)) != NULL) |
| 254 |
error(USER, cp); |
| 255 |
normaspect(viewaspect(&ourview), &pa, &hres, &vres); |
| 256 |
if (seq) { |
| 257 |
if (ralrm > 0) { |
| 258 |
sprintf(errmsg, "starting frame %d\n", seq); |
| 259 |
eputs(errmsg); |
| 260 |
} |
| 261 |
printf("FRAME=%d\n", seq); |
| 262 |
} |
| 263 |
fputs(VIEWSTR, stdout); |
| 264 |
fprintview(&ourview, stdout); |
| 265 |
putchar('\n'); |
| 266 |
if (pa < .99 || pa > 1.01) |
| 267 |
fputaspect(pa, stdout); |
| 268 |
fputformat(COLRFMT, stdout); |
| 269 |
putchar('\n'); |
| 270 |
if (zout != NULL) |
| 271 |
sprintf(cp=fbuf, zout, seq); |
| 272 |
else |
| 273 |
cp = NULL; |
| 274 |
render(cp, prvr); |
| 275 |
prvr = NULL; |
| 276 |
} while (seq++); |
| 277 |
} |
| 278 |
|
| 279 |
|
| 280 |
nextview(fp) /* get next view from fp */ |
| 281 |
FILE *fp; |
| 282 |
{ |
| 283 |
char linebuf[256]; |
| 284 |
|
| 285 |
while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
| 286 |
if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
| 287 |
return(0); |
| 288 |
return(EOF); |
| 289 |
} |
| 290 |
|
| 291 |
|
| 292 |
render(zfile, oldfile) /* render the scene */ |
| 293 |
char *zfile, *oldfile; |
| 294 |
{ |
| 295 |
extern long lseek(); |
| 296 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
| 297 |
float *zbar[MAXDIV+1]; /* z values */ |
| 298 |
char *sampdens; /* previous sample density */ |
| 299 |
int ypos; /* current scanline */ |
| 300 |
int ystep; /* current y step size */ |
| 301 |
int hstep; /* h step size */ |
| 302 |
int zfd; |
| 303 |
COLOR *colptr; |
| 304 |
float *zptr; |
| 305 |
register int i; |
| 306 |
/* allocate scanlines */ |
| 307 |
for (i = 0; i <= psample; i++) { |
| 308 |
scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR)); |
| 309 |
if (scanbar[i] == NULL) |
| 310 |
goto memerr; |
| 311 |
} |
| 312 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
| 313 |
ystep = (psample*99+70)/140; |
| 314 |
if (hstep > 2) { |
| 315 |
i = hres/hstep + 2; |
| 316 |
if ((sampdens = malloc(i)) == NULL) |
| 317 |
goto memerr; |
| 318 |
while (i--) |
| 319 |
sampdens[i] = hstep; |
| 320 |
} else |
| 321 |
sampdens = NULL; |
| 322 |
/* open z file */ |
| 323 |
if (zfile != NULL) { |
| 324 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
| 325 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
| 326 |
error(SYSTEM, errmsg); |
| 327 |
} |
| 328 |
for (i = 0; i <= psample; i++) { |
| 329 |
zbar[i] = (float *)malloc(hres*sizeof(float)); |
| 330 |
if (zbar[i] == NULL) |
| 331 |
goto memerr; |
| 332 |
} |
| 333 |
} else { |
| 334 |
zfd = -1; |
| 335 |
for (i = 0; i <= psample; i++) |
| 336 |
zbar[i] = NULL; |
| 337 |
} |
| 338 |
/* write out boundaries */ |
| 339 |
fprtresolu(hres, vres, stdout); |
| 340 |
/* recover file and compute first */ |
| 341 |
i = salvage(oldfile); |
| 342 |
if (zfd != -1 && i > 0 && |
| 343 |
lseek(zfd, (long)i*hres*sizeof(float), 0) == -1) |
| 344 |
error(SYSTEM, "z file seek error in render"); |
| 345 |
pctdone = 100.0*i/vres; |
| 346 |
if (ralrm > 0) /* report init stats */ |
| 347 |
report(); |
| 348 |
#ifndef BSD |
| 349 |
else |
| 350 |
#endif |
| 351 |
signal(SIGALRM, report); |
| 352 |
ypos = vres-1 - i; |
| 353 |
fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
| 354 |
/* compute scanlines */ |
| 355 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
| 356 |
/* bottom adjust? */ |
| 357 |
if (ypos < 0) { |
| 358 |
ystep += ypos; |
| 359 |
ypos = 0; |
| 360 |
} |
| 361 |
colptr = scanbar[ystep]; /* move base to top */ |
| 362 |
scanbar[ystep] = scanbar[0]; |
| 363 |
scanbar[0] = colptr; |
| 364 |
zptr = zbar[ystep]; |
| 365 |
zbar[ystep] = zbar[0]; |
| 366 |
zbar[0] = zptr; |
| 367 |
/* fill base line */ |
| 368 |
fillscanline(scanbar[0], zbar[0], sampdens, |
| 369 |
hres, ypos, hstep); |
| 370 |
/* fill bar */ |
| 371 |
fillscanbar(scanbar, zbar, hres, ypos, ystep); |
| 372 |
/* write it out */ |
| 373 |
#ifndef BSD |
| 374 |
signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
| 375 |
#endif |
| 376 |
for (i = ystep; i > 0; i--) { |
| 377 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
| 378 |
hres*sizeof(float)) |
| 379 |
< hres*sizeof(float)) |
| 380 |
goto writerr; |
| 381 |
if (fwritescan(scanbar[i], hres, stdout) < 0) |
| 382 |
goto writerr; |
| 383 |
} |
| 384 |
if (fflush(stdout) == EOF) |
| 385 |
goto writerr; |
| 386 |
/* record progress */ |
| 387 |
pctdone = 100.0*(vres-1-ypos)/vres; |
| 388 |
if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
| 389 |
report(); |
| 390 |
#ifndef BSD |
| 391 |
else |
| 392 |
signal(SIGALRM, report); |
| 393 |
#endif |
| 394 |
} |
| 395 |
/* clean up */ |
| 396 |
signal(SIGALRM, SIG_IGN); |
| 397 |
if (zfd != -1) { |
| 398 |
if (write(zfd, (char *)zbar[0], hres*sizeof(float)) |
| 399 |
< hres*sizeof(float)) |
| 400 |
goto writerr; |
| 401 |
if (close(zfd) == -1) |
| 402 |
goto writerr; |
| 403 |
for (i = 0; i <= psample; i++) |
| 404 |
free((char *)zbar[i]); |
| 405 |
} |
| 406 |
fwritescan(scanbar[0], hres, stdout); |
| 407 |
if (fflush(stdout) == EOF) |
| 408 |
goto writerr; |
| 409 |
for (i = 0; i <= psample; i++) |
| 410 |
free((char *)scanbar[i]); |
| 411 |
if (sampdens != NULL) |
| 412 |
free(sampdens); |
| 413 |
pctdone = 100.0; |
| 414 |
return; |
| 415 |
writerr: |
| 416 |
error(SYSTEM, "write error in render"); |
| 417 |
memerr: |
| 418 |
error(SYSTEM, "out of memory in render"); |
| 419 |
} |
| 420 |
|
| 421 |
|
| 422 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
| 423 |
register COLOR *scanline; |
| 424 |
register float *zline; |
| 425 |
register char *sd; |
| 426 |
int xres, y, xstep; |
| 427 |
{ |
| 428 |
static int nc = 0; /* number of calls */ |
| 429 |
int bl = xstep, b = xstep; |
| 430 |
double z; |
| 431 |
register int i; |
| 432 |
|
| 433 |
z = pixvalue(scanline[0], 0, y); |
| 434 |
if (zline) zline[0] = z; |
| 435 |
/* zig-zag start for quincunx pattern */ |
| 436 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
| 437 |
if (i >= xres) { |
| 438 |
xstep += xres-1-i; |
| 439 |
i = xres-1; |
| 440 |
} |
| 441 |
z = pixvalue(scanline[i], i, y); |
| 442 |
if (zline) zline[i] = z; |
| 443 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
| 444 |
if (i <= xstep) |
| 445 |
b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
| 446 |
else |
| 447 |
b = fillsample(scanline+i-xstep, |
| 448 |
zline ? zline+i-xstep : NULL, |
| 449 |
i-xstep, y, xstep, 0, b/2); |
| 450 |
if (sd) *sd++ = nc & 1 ? bl : b; |
| 451 |
bl = b; |
| 452 |
} |
| 453 |
if (sd && nc & 1) *sd = bl; |
| 454 |
} |
| 455 |
|
| 456 |
|
| 457 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
| 458 |
register COLOR *scanbar[]; |
| 459 |
register float *zbar[]; |
| 460 |
int xres, y, ysize; |
| 461 |
{ |
| 462 |
COLOR vline[MAXDIV+1]; |
| 463 |
float zline[MAXDIV+1]; |
| 464 |
int b = ysize; |
| 465 |
register int i, j; |
| 466 |
|
| 467 |
for (i = 0; i < xres; i++) { |
| 468 |
|
| 469 |
copycolor(vline[0], scanbar[0][i]); |
| 470 |
copycolor(vline[ysize], scanbar[ysize][i]); |
| 471 |
if (zbar[0]) { |
| 472 |
zline[0] = zbar[0][i]; |
| 473 |
zline[ysize] = zbar[ysize][i]; |
| 474 |
} |
| 475 |
|
| 476 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
| 477 |
i, y, 0, ysize, b/2); |
| 478 |
|
| 479 |
for (j = 1; j < ysize; j++) |
| 480 |
copycolor(scanbar[j][i], vline[j]); |
| 481 |
if (zbar[0]) |
| 482 |
for (j = 1; j < ysize; j++) |
| 483 |
zbar[j][i] = zline[j]; |
| 484 |
} |
| 485 |
} |
| 486 |
|
| 487 |
|
| 488 |
int |
| 489 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
| 490 |
register COLOR *colline; |
| 491 |
register float *zline; |
| 492 |
int x, y; |
| 493 |
int xlen, ylen; |
| 494 |
int b; |
| 495 |
{ |
| 496 |
extern double fabs(); |
| 497 |
double ratio; |
| 498 |
double z; |
| 499 |
COLOR ctmp; |
| 500 |
int ncut; |
| 501 |
register int len; |
| 502 |
|
| 503 |
if (xlen > 0) /* x or y length is zero */ |
| 504 |
len = xlen; |
| 505 |
else |
| 506 |
len = ylen; |
| 507 |
|
| 508 |
if (len <= 1) /* limit recursion */ |
| 509 |
return(0); |
| 510 |
|
| 511 |
if (b > 0 |
| 512 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
| 513 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
| 514 |
|
| 515 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
| 516 |
if (zline) zline[len>>1] = z; |
| 517 |
ncut = 1; |
| 518 |
|
| 519 |
} else { /* interpolate */ |
| 520 |
|
| 521 |
copycolor(colline[len>>1], colline[len]); |
| 522 |
ratio = (double)(len>>1) / len; |
| 523 |
scalecolor(colline[len>>1], ratio); |
| 524 |
if (zline) zline[len>>1] = zline[len] * ratio; |
| 525 |
ratio = 1.0 - ratio; |
| 526 |
copycolor(ctmp, colline[0]); |
| 527 |
scalecolor(ctmp, ratio); |
| 528 |
addcolor(colline[len>>1], ctmp); |
| 529 |
if (zline) zline[len>>1] += zline[0] * ratio; |
| 530 |
ncut = 0; |
| 531 |
} |
| 532 |
/* recurse */ |
| 533 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
| 534 |
|
| 535 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
| 536 |
x+(xlen>>1), y+(ylen>>1), |
| 537 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
| 538 |
|
| 539 |
return(ncut); |
| 540 |
} |
| 541 |
|
| 542 |
|
| 543 |
double |
| 544 |
pixvalue(col, x, y) /* compute pixel value */ |
| 545 |
COLOR col; /* returned color */ |
| 546 |
int x, y; /* pixel position */ |
| 547 |
{ |
| 548 |
static RAY thisray; |
| 549 |
|
| 550 |
if (viewray(thisray.rorg, thisray.rdir, &ourview, |
| 551 |
(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) { |
| 552 |
setcolor(col, 0.0, 0.0, 0.0); |
| 553 |
return(0.0); |
| 554 |
} |
| 555 |
|
| 556 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
| 557 |
|
| 558 |
samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
| 559 |
|
| 560 |
rayvalue(&thisray); /* trace ray */ |
| 561 |
|
| 562 |
copycolor(col, thisray.rcol); /* return color */ |
| 563 |
|
| 564 |
return(thisray.rt); /* return distance */ |
| 565 |
} |
| 566 |
|
| 567 |
|
| 568 |
int |
| 569 |
salvage(oldfile) /* salvage scanlines from killed program */ |
| 570 |
char *oldfile; |
| 571 |
{ |
| 572 |
COLR *scanline; |
| 573 |
FILE *fp; |
| 574 |
int x, y; |
| 575 |
|
| 576 |
if (oldfile == NULL) |
| 577 |
return(0); |
| 578 |
|
| 579 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
| 580 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
| 581 |
error(WARNING, errmsg); |
| 582 |
return(0); |
| 583 |
} |
| 584 |
/* discard header */ |
| 585 |
getheader(fp, NULL); |
| 586 |
/* get picture size */ |
| 587 |
if (!fscnresolu(&x, &y, fp)) { |
| 588 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
| 589 |
error(WARNING, errmsg); |
| 590 |
fclose(fp); |
| 591 |
return(0); |
| 592 |
} |
| 593 |
|
| 594 |
if (x != hres || y != vres) { |
| 595 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
| 596 |
oldfile); |
| 597 |
error(USER, errmsg); |
| 598 |
} |
| 599 |
|
| 600 |
scanline = (COLR *)malloc(hres*sizeof(COLR)); |
| 601 |
if (scanline == NULL) |
| 602 |
error(SYSTEM, "out of memory in salvage"); |
| 603 |
for (y = 0; y < vres; y++) { |
| 604 |
if (freadcolrs(scanline, hres, fp) < 0) |
| 605 |
break; |
| 606 |
if (fwritecolrs(scanline, hres, stdout) < 0) |
| 607 |
goto writerr; |
| 608 |
} |
| 609 |
if (fflush(stdout) == EOF) |
| 610 |
goto writerr; |
| 611 |
free((char *)scanline); |
| 612 |
fclose(fp); |
| 613 |
unlink(oldfile); |
| 614 |
return(y); |
| 615 |
writerr: |
| 616 |
sprintf(errmsg, "write error during recovery of \"%s\"", oldfile); |
| 617 |
error(SYSTEM, errmsg); |
| 618 |
} |
| 619 |
|
| 620 |
|
| 621 |
int |
| 622 |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
| 623 |
register int x, y; |
| 624 |
int xres, yres; |
| 625 |
{ |
| 626 |
x -= y; |
| 627 |
while (x < 0) |
| 628 |
x += xres; |
| 629 |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
| 630 |
} |
