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 |
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*/ |
12 |
|
13 |
#include "ray.h" |
14 |
|
15 |
#include <sys/types.h> |
16 |
|
17 |
#ifndef NIX |
18 |
#ifdef BSD |
19 |
#include <sys/time.h> |
20 |
#include <sys/resource.h> |
21 |
#else |
22 |
#include <sys/times.h> |
23 |
#include <sys/utsname.h> |
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#include <limits.h> |
25 |
#endif |
26 |
#endif |
27 |
|
28 |
extern time_t time(); |
29 |
|
30 |
#include <signal.h> |
31 |
|
32 |
#include "view.h" |
33 |
|
34 |
#include "resolu.h" |
35 |
|
36 |
#include "random.h" |
37 |
|
38 |
#include "paths.h" |
39 |
|
40 |
#define RFTEMPLATE "rfXXXXXX" |
41 |
|
42 |
#ifndef SIGCONT |
43 |
#define SIGCONT SIGIO |
44 |
#endif |
45 |
|
46 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
47 |
int ndims = 0; /* number of sampling dimensions */ |
48 |
int samplendx; /* sample index number */ |
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|
50 |
VIEW ourview = STDVIEW; /* view parameters */ |
51 |
int hresolu = 512; /* horizontal resolution */ |
52 |
int vresolu = 512; /* vertical resolution */ |
53 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
54 |
|
55 |
int psample = 4; /* pixel sample size */ |
56 |
double maxdiff = .05; /* max. difference for interpolation */ |
57 |
double dstrpix = 0.67; /* square pixel distribution */ |
58 |
|
59 |
double dstrsrc = 0.0; /* square source distribution */ |
60 |
double shadthresh = .05; /* shadow threshold */ |
61 |
double shadcert = .5; /* shadow certainty */ |
62 |
int directrelay = 1; /* number of source relays */ |
63 |
int vspretest = 512; /* virtual source pretest density */ |
64 |
int directvis = 1; /* sources visible? */ |
65 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
66 |
|
67 |
double specthresh = .15; /* specular sampling threshold */ |
68 |
double specjitter = 1.; /* specular sampling jitter */ |
69 |
|
70 |
int maxdepth = 6; /* maximum recursion depth */ |
71 |
double minweight = 5e-3; /* minimum ray weight */ |
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|
73 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
74 |
double ambacc = 0.2; /* ambient accuracy */ |
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int ambres = 32; /* ambient resolution */ |
76 |
int ambdiv = 128; /* ambient divisions */ |
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int ambssamp = 0; /* ambient super-samples */ |
78 |
int ambounce = 0; /* ambient bounces */ |
79 |
char *amblist[128]; /* ambient include/exclude list */ |
80 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
82 |
#ifdef MSDOS |
83 |
int ralrm = 60; /* seconds between reports */ |
84 |
#else |
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int ralrm = 0; /* seconds between reports */ |
86 |
#endif |
87 |
|
88 |
double pctdone = 0.0; /* percentage done */ |
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|
90 |
time_t tlastrept = 0L; /* time at last report */ |
91 |
|
92 |
extern time_t tstart; /* starting time */ |
93 |
|
94 |
extern unsigned long nrays; /* number of rays traced */ |
95 |
|
96 |
#define MAXDIV 16 /* maximum sample size */ |
97 |
|
98 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
99 |
|
100 |
static int hres, vres; /* resolution for this frame */ |
101 |
|
102 |
extern char *mktemp(); |
103 |
|
104 |
double pixvalue(); |
105 |
|
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#ifdef NIX |
107 |
#define file_exists(f) (access(f,F_OK)==0) |
108 |
#else |
109 |
#include <sys/types.h> |
110 |
#include <sys/stat.h> |
111 |
int |
112 |
file_exists(fname) /* ordinary file exists? */ |
113 |
char *fname; |
114 |
{ |
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struct stat sbuf; |
116 |
if (stat(fname, &sbuf) < 0) return(0); |
117 |
return((sbuf.st_mode & S_IFREG) != 0); |
118 |
} |
119 |
#endif |
120 |
|
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|
122 |
quit(code) /* quit program */ |
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int code; |
124 |
{ |
125 |
if (code) /* report status */ |
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report(); |
127 |
headclean(); /* delete header file */ |
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pfclean(); /* clean up persist files */ |
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exit(code); |
130 |
} |
131 |
|
132 |
|
133 |
#ifndef NIX |
134 |
report() /* report progress */ |
135 |
{ |
136 |
double u, s; |
137 |
#ifdef BSD |
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char hostname[257]; |
139 |
struct rusage rubuf; |
140 |
#else |
141 |
struct tms tbuf; |
142 |
struct utsname nambuf; |
143 |
#define hostname nambuf.sysname |
144 |
#endif |
145 |
|
146 |
tlastrept = time((time_t *)NULL); |
147 |
#ifdef BSD |
148 |
getrusage(RUSAGE_SELF, &rubuf); |
149 |
u = rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
150 |
s = rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
151 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
152 |
u += rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
153 |
s += rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
154 |
gethostname(hostname, sizeof(hostname)); |
155 |
#else |
156 |
times(&tbuf); |
157 |
u = ( tbuf.tms_utime + tbuf.tms_cutime ) / CLK_TCK; |
158 |
s = ( tbuf.tms_stime + tbuf.tms_cstime ) / CLK_TCK; |
159 |
uname(&nambuf); |
160 |
#endif |
161 |
|
162 |
sprintf(errmsg, |
163 |
"%lu rays, %4.2f%% after %.3fu %.3fs %.3fr hours on %s\n", |
164 |
nrays, pctdone, u/3600., s/3600., |
165 |
(tlastrept-tstart)/3600., hostname); |
166 |
eputs(errmsg); |
167 |
#undef hostname |
168 |
} |
169 |
#else |
170 |
report() /* report progress */ |
171 |
{ |
172 |
tlastrept = time((time_t *)NULL); |
173 |
sprintf(errmsg, "%lu rays, %4.2f%% after %5.4f hours\n", |
174 |
nrays, pctdone, (tlastrept-tstart)/3600.0); |
175 |
eputs(errmsg); |
176 |
signal(SIGCONT, report); |
177 |
} |
178 |
#endif |
179 |
|
180 |
|
181 |
rpict(seq, pout, zout, prvr) /* generate image(s) */ |
182 |
int seq; |
183 |
char *pout, *zout, *prvr; |
184 |
/* |
185 |
* If seq is greater than zero, then we will render a sequence of |
186 |
* images based on view parameter strings read from the standard input. |
187 |
* If pout is NULL, then all images will be sent to the standard ouput. |
188 |
* If seq is greater than zero and prvr is an integer, then it is the |
189 |
* frame number at which rendering should begin. Preceeding view parameter |
190 |
* strings will be skipped in the input. |
191 |
* If pout and prvr are the same, prvr is renamed to avoid overwriting. |
192 |
* Note that pout and zout should contain %d format specifications for |
193 |
* sequenced file naming. |
194 |
*/ |
195 |
{ |
196 |
extern char *rindex(), *strncpy(), *strcat(), *strcpy(); |
197 |
char fbuf[128], fbuf2[128]; |
198 |
int npicts; |
199 |
register char *cp; |
200 |
RESOLU rs; |
201 |
double pa; |
202 |
/* check sampling */ |
203 |
if (psample < 1) |
204 |
psample = 1; |
205 |
else if (psample > MAXDIV) { |
206 |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
207 |
psample, MAXDIV); |
208 |
error(WARNING, errmsg); |
209 |
psample = MAXDIV; |
210 |
} |
211 |
/* get starting frame */ |
212 |
if (seq <= 0) |
213 |
seq = 0; |
214 |
else if (prvr != NULL && isint(prvr)) { |
215 |
register int rn; /* skip to specified view */ |
216 |
if ((rn = atoi(prvr)) < seq) |
217 |
error(USER, "recover frame less than start frame"); |
218 |
if (pout == NULL) |
219 |
error(USER, "missing output file specification"); |
220 |
for ( ; seq < rn; seq++) |
221 |
if (nextview(stdin) == EOF) |
222 |
error(USER, "unexpected EOF on view input"); |
223 |
prvr = fbuf; /* mark for renaming */ |
224 |
} |
225 |
if (pout != NULL & prvr != NULL) { |
226 |
sprintf(fbuf, pout, seq); |
227 |
if (!strcmp(prvr, fbuf)) { /* rename */ |
228 |
strcpy(fbuf2, fbuf); |
229 |
for (cp = fbuf2; *cp; cp++) |
230 |
; |
231 |
while (cp > fbuf2 && !ISDIRSEP(cp[-1])) |
232 |
cp--; |
233 |
strcpy(cp, RFTEMPLATE); |
234 |
prvr = mktemp(fbuf2); |
235 |
if (rename(fbuf, prvr) < 0) |
236 |
if (errno == ENOENT) { /* ghost file */ |
237 |
sprintf(errmsg, |
238 |
"new output file \"%s\"", |
239 |
fbuf); |
240 |
error(WARNING, errmsg); |
241 |
prvr = NULL; |
242 |
} else { /* serious error */ |
243 |
sprintf(errmsg, |
244 |
"cannot rename \"%s\" to \"%s\"", |
245 |
fbuf, prvr); |
246 |
error(SYSTEM, errmsg); |
247 |
} |
248 |
} |
249 |
} |
250 |
npicts = 0; /* render sequence */ |
251 |
do { |
252 |
if (seq && nextview(stdin) == EOF) |
253 |
break; |
254 |
pctdone = 0.0; |
255 |
if (pout != NULL) { |
256 |
sprintf(fbuf, pout, seq); |
257 |
if (file_exists(fbuf)) { |
258 |
if (prvr != NULL || !strcmp(fbuf, pout)) { |
259 |
sprintf(errmsg, |
260 |
"output file \"%s\" exists", |
261 |
fbuf); |
262 |
error(USER, errmsg); |
263 |
} |
264 |
continue; /* don't clobber */ |
265 |
} |
266 |
if (freopen(fbuf, "w", stdout) == NULL) { |
267 |
sprintf(errmsg, |
268 |
"cannot open output file \"%s\"", fbuf); |
269 |
error(SYSTEM, errmsg); |
270 |
} |
271 |
#ifdef MSDOS |
272 |
setmode(fileno(stdout), O_BINARY); |
273 |
#endif |
274 |
dupheader(); |
275 |
} |
276 |
hres = hresolu; vres = vresolu; pa = pixaspect; |
277 |
if (prvr != NULL) |
278 |
if (viewfile(prvr, &ourview, &rs) <= 0 |
279 |
|| rs.or != PIXSTANDARD) { |
280 |
sprintf(errmsg, |
281 |
"cannot recover view parameters from \"%s\"", prvr); |
282 |
error(WARNING, errmsg); |
283 |
} else { |
284 |
pa = 0.0; |
285 |
hres = scanlen(&rs); |
286 |
vres = numscans(&rs); |
287 |
} |
288 |
if ((cp = setview(&ourview)) != NULL) |
289 |
error(USER, cp); |
290 |
normaspect(viewaspect(&ourview), &pa, &hres, &vres); |
291 |
if (seq) { |
292 |
if (ralrm > 0) { |
293 |
fprintf(stderr, "FRAME %d:", seq); |
294 |
fprintview(&ourview, stderr); |
295 |
putc('\n', stderr); |
296 |
fflush(stderr); |
297 |
} |
298 |
printf("FRAME=%d\n", seq); |
299 |
} |
300 |
fputs(VIEWSTR, stdout); |
301 |
fprintview(&ourview, stdout); |
302 |
putchar('\n'); |
303 |
if (pa < .99 || pa > 1.01) |
304 |
fputaspect(pa, stdout); |
305 |
fputformat(COLRFMT, stdout); |
306 |
putchar('\n'); |
307 |
if (zout != NULL) |
308 |
sprintf(cp=fbuf, zout, seq); |
309 |
else |
310 |
cp = NULL; |
311 |
render(cp, prvr); |
312 |
prvr = NULL; |
313 |
npicts++; |
314 |
} while (seq++); |
315 |
/* check that we did something */ |
316 |
if (npicts == 0) |
317 |
error(WARNING, "no output produced"); |
318 |
} |
319 |
|
320 |
|
321 |
nextview(fp) /* get next view from fp */ |
322 |
FILE *fp; |
323 |
{ |
324 |
char linebuf[256]; |
325 |
|
326 |
while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
327 |
if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
328 |
return(0); |
329 |
return(EOF); |
330 |
} |
331 |
|
332 |
|
333 |
render(zfile, oldfile) /* render the scene */ |
334 |
char *zfile, *oldfile; |
335 |
{ |
336 |
extern long lseek(); |
337 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
338 |
float *zbar[MAXDIV+1]; /* z values */ |
339 |
char *sampdens; /* previous sample density */ |
340 |
int ypos; /* current scanline */ |
341 |
int ystep; /* current y step size */ |
342 |
int hstep; /* h step size */ |
343 |
int zfd; |
344 |
COLOR *colptr; |
345 |
float *zptr; |
346 |
register int i; |
347 |
/* allocate scanlines */ |
348 |
for (i = 0; i <= psample; i++) { |
349 |
scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR)); |
350 |
if (scanbar[i] == NULL) |
351 |
goto memerr; |
352 |
} |
353 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
354 |
ystep = (psample*99+70)/140; |
355 |
if (hstep > 2) { |
356 |
i = hres/hstep + 2; |
357 |
if ((sampdens = malloc(i)) == NULL) |
358 |
goto memerr; |
359 |
while (i--) |
360 |
sampdens[i] = hstep; |
361 |
} else |
362 |
sampdens = NULL; |
363 |
/* open z-file */ |
364 |
if (zfile != NULL) { |
365 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
366 |
sprintf(errmsg, "cannot open z-file \"%s\"", zfile); |
367 |
error(SYSTEM, errmsg); |
368 |
} |
369 |
#ifdef MSDOS |
370 |
setmode(zfd, O_BINARY); |
371 |
#endif |
372 |
for (i = 0; i <= psample; i++) { |
373 |
zbar[i] = (float *)malloc(hres*sizeof(float)); |
374 |
if (zbar[i] == NULL) |
375 |
goto memerr; |
376 |
} |
377 |
} else { |
378 |
zfd = -1; |
379 |
for (i = 0; i <= psample; i++) |
380 |
zbar[i] = NULL; |
381 |
} |
382 |
/* write out boundaries */ |
383 |
fprtresolu(hres, vres, stdout); |
384 |
/* recover file and compute first */ |
385 |
i = salvage(oldfile); |
386 |
if (zfd != -1 && i > 0 && |
387 |
lseek(zfd, (long)i*hres*sizeof(float), 0) == -1) |
388 |
error(SYSTEM, "z-file seek error in render"); |
389 |
pctdone = 100.0*i/vres; |
390 |
if (ralrm > 0) /* report init stats */ |
391 |
report(); |
392 |
#ifndef BSD |
393 |
else |
394 |
#endif |
395 |
signal(SIGCONT, report); |
396 |
ypos = vres-1 - i; |
397 |
fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
398 |
/* compute scanlines */ |
399 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
400 |
/* bottom adjust? */ |
401 |
if (ypos < 0) { |
402 |
ystep += ypos; |
403 |
ypos = 0; |
404 |
} |
405 |
colptr = scanbar[ystep]; /* move base to top */ |
406 |
scanbar[ystep] = scanbar[0]; |
407 |
scanbar[0] = colptr; |
408 |
zptr = zbar[ystep]; |
409 |
zbar[ystep] = zbar[0]; |
410 |
zbar[0] = zptr; |
411 |
/* fill base line */ |
412 |
fillscanline(scanbar[0], zbar[0], sampdens, |
413 |
hres, ypos, hstep); |
414 |
/* fill bar */ |
415 |
fillscanbar(scanbar, zbar, hres, ypos, ystep); |
416 |
/* write it out */ |
417 |
#ifndef BSD |
418 |
signal(SIGCONT, SIG_IGN); /* don't interrupt writes */ |
419 |
#endif |
420 |
for (i = ystep; i > 0; i--) { |
421 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
422 |
hres*sizeof(float)) |
423 |
< hres*sizeof(float)) |
424 |
goto writerr; |
425 |
if (fwritescan(scanbar[i], hres, stdout) < 0) |
426 |
goto writerr; |
427 |
} |
428 |
if (fflush(stdout) == EOF) |
429 |
goto writerr; |
430 |
/* record progress */ |
431 |
pctdone = 100.0*(vres-1-ypos)/vres; |
432 |
if (ralrm > 0 && time((time_t *)NULL) >= tlastrept+ralrm) |
433 |
report(); |
434 |
#ifndef BSD |
435 |
else |
436 |
signal(SIGCONT, report); |
437 |
#endif |
438 |
} |
439 |
/* clean up */ |
440 |
signal(SIGCONT, SIG_IGN); |
441 |
if (zfd != -1) { |
442 |
if (write(zfd, (char *)zbar[0], hres*sizeof(float)) |
443 |
< hres*sizeof(float)) |
444 |
goto writerr; |
445 |
if (close(zfd) == -1) |
446 |
goto writerr; |
447 |
for (i = 0; i <= psample; i++) |
448 |
free((char *)zbar[i]); |
449 |
} |
450 |
fwritescan(scanbar[0], hres, stdout); |
451 |
if (fflush(stdout) == EOF) |
452 |
goto writerr; |
453 |
for (i = 0; i <= psample; i++) |
454 |
free((char *)scanbar[i]); |
455 |
if (sampdens != NULL) |
456 |
free(sampdens); |
457 |
pctdone = 100.0; |
458 |
if (ralrm > 0) |
459 |
report(); |
460 |
signal(SIGCONT, SIG_DFL); |
461 |
return; |
462 |
writerr: |
463 |
error(SYSTEM, "write error in render"); |
464 |
memerr: |
465 |
error(SYSTEM, "out of memory in render"); |
466 |
} |
467 |
|
468 |
|
469 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
470 |
register COLOR *scanline; |
471 |
register float *zline; |
472 |
register char *sd; |
473 |
int xres, y, xstep; |
474 |
{ |
475 |
static int nc = 0; /* number of calls */ |
476 |
int bl = xstep, b = xstep; |
477 |
double z; |
478 |
register int i; |
479 |
|
480 |
z = pixvalue(scanline[0], 0, y); |
481 |
if (zline) zline[0] = z; |
482 |
/* zig-zag start for quincunx pattern */ |
483 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
484 |
if (i >= xres) { |
485 |
xstep += xres-1-i; |
486 |
i = xres-1; |
487 |
} |
488 |
z = pixvalue(scanline[i], i, y); |
489 |
if (zline) zline[i] = z; |
490 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
491 |
if (i <= xstep) |
492 |
b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
493 |
else |
494 |
b = fillsample(scanline+i-xstep, |
495 |
zline ? zline+i-xstep : NULL, |
496 |
i-xstep, y, xstep, 0, b/2); |
497 |
if (sd) *sd++ = nc & 1 ? bl : b; |
498 |
bl = b; |
499 |
} |
500 |
if (sd && nc & 1) *sd = bl; |
501 |
} |
502 |
|
503 |
|
504 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
505 |
register COLOR *scanbar[]; |
506 |
register float *zbar[]; |
507 |
int xres, y, ysize; |
508 |
{ |
509 |
COLOR vline[MAXDIV+1]; |
510 |
float zline[MAXDIV+1]; |
511 |
int b = ysize; |
512 |
register int i, j; |
513 |
|
514 |
for (i = 0; i < xres; i++) { |
515 |
|
516 |
copycolor(vline[0], scanbar[0][i]); |
517 |
copycolor(vline[ysize], scanbar[ysize][i]); |
518 |
if (zbar[0]) { |
519 |
zline[0] = zbar[0][i]; |
520 |
zline[ysize] = zbar[ysize][i]; |
521 |
} |
522 |
|
523 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
524 |
i, y, 0, ysize, b/2); |
525 |
|
526 |
for (j = 1; j < ysize; j++) |
527 |
copycolor(scanbar[j][i], vline[j]); |
528 |
if (zbar[0]) |
529 |
for (j = 1; j < ysize; j++) |
530 |
zbar[j][i] = zline[j]; |
531 |
} |
532 |
} |
533 |
|
534 |
|
535 |
int |
536 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
537 |
register COLOR *colline; |
538 |
register float *zline; |
539 |
int x, y; |
540 |
int xlen, ylen; |
541 |
int b; |
542 |
{ |
543 |
double ratio; |
544 |
double z; |
545 |
COLOR ctmp; |
546 |
int ncut; |
547 |
register int len; |
548 |
|
549 |
if (xlen > 0) /* x or y length is zero */ |
550 |
len = xlen; |
551 |
else |
552 |
len = ylen; |
553 |
|
554 |
if (len <= 1) /* limit recursion */ |
555 |
return(0); |
556 |
|
557 |
if (b > 0 |
558 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
559 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
560 |
|
561 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
562 |
if (zline) zline[len>>1] = z; |
563 |
ncut = 1; |
564 |
|
565 |
} else { /* interpolate */ |
566 |
|
567 |
copycolor(colline[len>>1], colline[len]); |
568 |
ratio = (double)(len>>1) / len; |
569 |
scalecolor(colline[len>>1], ratio); |
570 |
if (zline) zline[len>>1] = zline[len] * ratio; |
571 |
ratio = 1.0 - ratio; |
572 |
copycolor(ctmp, colline[0]); |
573 |
scalecolor(ctmp, ratio); |
574 |
addcolor(colline[len>>1], ctmp); |
575 |
if (zline) zline[len>>1] += zline[0] * ratio; |
576 |
ncut = 0; |
577 |
} |
578 |
/* recurse */ |
579 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
580 |
|
581 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
582 |
x+(xlen>>1), y+(ylen>>1), |
583 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
584 |
|
585 |
return(ncut); |
586 |
} |
587 |
|
588 |
|
589 |
double |
590 |
pixvalue(col, x, y) /* compute pixel value */ |
591 |
COLOR col; /* returned color */ |
592 |
int x, y; /* pixel position */ |
593 |
{ |
594 |
static RAY thisray; |
595 |
|
596 |
if (viewray(thisray.rorg, thisray.rdir, &ourview, |
597 |
(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) { |
598 |
setcolor(col, 0.0, 0.0, 0.0); |
599 |
return(0.0); |
600 |
} |
601 |
|
602 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
603 |
|
604 |
samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
605 |
|
606 |
rayvalue(&thisray); /* trace ray */ |
607 |
|
608 |
copycolor(col, thisray.rcol); /* return color */ |
609 |
|
610 |
return(thisray.rt); /* return distance */ |
611 |
} |
612 |
|
613 |
|
614 |
int |
615 |
salvage(oldfile) /* salvage scanlines from killed program */ |
616 |
char *oldfile; |
617 |
{ |
618 |
COLR *scanline; |
619 |
FILE *fp; |
620 |
int x, y; |
621 |
|
622 |
if (oldfile == NULL) |
623 |
return(0); |
624 |
|
625 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
626 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
627 |
error(WARNING, errmsg); |
628 |
return(0); |
629 |
} |
630 |
#ifdef MSDOS |
631 |
setmode(fileno(fp), O_BINARY); |
632 |
#endif |
633 |
/* discard header */ |
634 |
getheader(fp, NULL, NULL); |
635 |
/* get picture size */ |
636 |
if (!fscnresolu(&x, &y, fp)) { |
637 |
sprintf(errmsg, "bad recover file \"%s\" - not removed", |
638 |
oldfile); |
639 |
error(WARNING, errmsg); |
640 |
fclose(fp); |
641 |
return(0); |
642 |
} |
643 |
|
644 |
if (x != hres || y != vres) { |
645 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
646 |
oldfile); |
647 |
error(USER, errmsg); |
648 |
} |
649 |
|
650 |
scanline = (COLR *)malloc(hres*sizeof(COLR)); |
651 |
if (scanline == NULL) |
652 |
error(SYSTEM, "out of memory in salvage"); |
653 |
for (y = 0; y < vres; y++) { |
654 |
if (freadcolrs(scanline, hres, fp) < 0) |
655 |
break; |
656 |
if (fwritecolrs(scanline, hres, stdout) < 0) |
657 |
goto writerr; |
658 |
} |
659 |
if (fflush(stdout) == EOF) |
660 |
goto writerr; |
661 |
free((char *)scanline); |
662 |
fclose(fp); |
663 |
unlink(oldfile); |
664 |
return(y); |
665 |
writerr: |
666 |
sprintf(errmsg, "write error during recovery of \"%s\"", oldfile); |
667 |
error(SYSTEM, errmsg); |
668 |
} |
669 |
|
670 |
|
671 |
int |
672 |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
673 |
register int x, y; |
674 |
int xres, yres; |
675 |
{ |
676 |
x -= y; |
677 |
while (x < 0) |
678 |
x += xres; |
679 |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
680 |
} |