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 |
|
22 |
#include "view.h" |
23 |
|
24 |
#include "resolu.h" |
25 |
|
26 |
#include "random.h" |
27 |
|
28 |
#include "paths.h" |
29 |
|
30 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
31 |
int ndims = 0; /* number of sampling dimensions */ |
32 |
int samplendx; /* sample index number */ |
33 |
|
34 |
VIEW ourview = STDVIEW; /* view parameters */ |
35 |
int hresolu = 512; /* horizontal resolution */ |
36 |
int vresolu = 512; /* vertical resolution */ |
37 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
38 |
|
39 |
int psample = 4; /* pixel sample size */ |
40 |
double maxdiff = .05; /* max. difference for interpolation */ |
41 |
double dstrpix = 0.67; /* square pixel distribution */ |
42 |
|
43 |
double dstrsrc = 0.0; /* square source distribution */ |
44 |
double shadthresh = .05; /* shadow threshold */ |
45 |
double shadcert = .5; /* shadow certainty */ |
46 |
int directrelay = 1; /* number of source relays */ |
47 |
int vspretest = 512; /* virtual source pretest density */ |
48 |
int directinvis = 0; /* sources invisible? */ |
49 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
50 |
|
51 |
double specthresh = .15; /* specular sampling threshold */ |
52 |
double specjitter = 1.; /* specular sampling jitter */ |
53 |
|
54 |
int maxdepth = 6; /* maximum recursion depth */ |
55 |
double minweight = 5e-3; /* minimum ray weight */ |
56 |
|
57 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
58 |
double ambacc = 0.2; /* ambient accuracy */ |
59 |
int ambres = 32; /* ambient resolution */ |
60 |
int ambdiv = 128; /* ambient divisions */ |
61 |
int ambssamp = 0; /* ambient super-samples */ |
62 |
int ambounce = 0; /* ambient bounces */ |
63 |
char *amblist[128]; /* ambient include/exclude list */ |
64 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
65 |
|
66 |
int ralrm = 0; /* seconds between reports */ |
67 |
|
68 |
double pctdone = 0.0; /* percentage done */ |
69 |
|
70 |
long tlastrept = 0L; /* time at last report */ |
71 |
|
72 |
extern long time(); |
73 |
extern long tstart; /* starting time */ |
74 |
|
75 |
extern long nrays; /* number of rays traced */ |
76 |
|
77 |
#define MAXDIV 16 /* maximum sample size */ |
78 |
|
79 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
80 |
|
81 |
#define RFTEMPLATE "rfXXXXXX" |
82 |
#define HFTEMPLATE TEMPLATE |
83 |
|
84 |
static char *hfname = NULL; /* header file name */ |
85 |
static FILE *hfp = NULL; /* header file pointer */ |
86 |
|
87 |
static int hres, vres; /* resolution for this frame */ |
88 |
|
89 |
extern char *mktemp(); |
90 |
|
91 |
double pixvalue(); |
92 |
|
93 |
|
94 |
quit(code) /* quit program */ |
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int code; |
96 |
{ |
97 |
if (code) /* report status */ |
98 |
report(); |
99 |
if (hfname != NULL) { /* delete header file */ |
100 |
if (hfp != NULL) |
101 |
fclose(hfp); |
102 |
unlink(hfname); |
103 |
} |
104 |
exit(code); |
105 |
} |
106 |
|
107 |
|
108 |
#ifdef BSD |
109 |
report() /* report progress */ |
110 |
{ |
111 |
struct rusage rubuf; |
112 |
double t; |
113 |
|
114 |
getrusage(RUSAGE_SELF, &rubuf); |
115 |
t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
116 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
117 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
118 |
t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
119 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
120 |
|
121 |
sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
122 |
nrays, pctdone, t/3600.0); |
123 |
eputs(errmsg); |
124 |
tlastrept = time((long *)0); |
125 |
} |
126 |
#else |
127 |
report() /* report progress */ |
128 |
{ |
129 |
tlastrept = time((long *)0); |
130 |
sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n", |
131 |
nrays, pctdone, (tlastrept-tstart)/3600.0); |
132 |
eputs(errmsg); |
133 |
signal(SIGALRM, report); |
134 |
} |
135 |
#endif |
136 |
|
137 |
|
138 |
openheader() /* save standard output to header file */ |
139 |
{ |
140 |
hfname = mktemp(HFTEMPLATE); |
141 |
if (freopen(hfname, "w", stdout) == NULL) { |
142 |
sprintf(errmsg, "cannot open header file \"%s\"", hfname); |
143 |
error(SYSTEM, errmsg); |
144 |
} |
145 |
} |
146 |
|
147 |
|
148 |
closeheader() /* done with header output */ |
149 |
{ |
150 |
if (hfname == NULL) |
151 |
return; |
152 |
if (fflush(stdout) == EOF || (hfp = fopen(hfname, "r")) == NULL) |
153 |
error(SYSTEM, "error reopening header file"); |
154 |
} |
155 |
|
156 |
|
157 |
dupheader() /* repeat header on standard output */ |
158 |
{ |
159 |
register int c; |
160 |
|
161 |
if (fseek(hfp, 0L, 0) < 0) |
162 |
error(SYSTEM, "seek error on header file"); |
163 |
while ((c = getc(hfp)) != EOF) |
164 |
putchar(c); |
165 |
} |
166 |
|
167 |
|
168 |
rpict(seq, pout, zout, prvr) /* generate image(s) */ |
169 |
int seq; |
170 |
char *pout, *zout, *prvr; |
171 |
/* |
172 |
* If seq is greater than zero, then we will render a sequence of |
173 |
* images based on view parameter strings read from the standard input. |
174 |
* If pout is NULL, then all images will be sent to the standard ouput. |
175 |
* If seq is greater than zero and prvr is an integer, then it is the |
176 |
* frame number at which rendering should begin. Preceeding view parameter |
177 |
* strings will be skipped in the input. |
178 |
* If pout and prvr are the same, prvr is renamed to avoid overwriting. |
179 |
* Note that pout and zout should contain %d format specifications for |
180 |
* sequenced file naming. |
181 |
*/ |
182 |
{ |
183 |
extern char *rindex(), *strncpy(), *strcat(); |
184 |
char fbuf[128], fbuf2[128]; |
185 |
register char *cp; |
186 |
RESOLU rs; |
187 |
double pa; |
188 |
/* finished writing header */ |
189 |
closeheader(); |
190 |
/* check sampling */ |
191 |
if (psample < 1) |
192 |
psample = 1; |
193 |
else if (psample > MAXDIV) { |
194 |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
195 |
psample, MAXDIV); |
196 |
error(WARNING, errmsg); |
197 |
psample = MAXDIV; |
198 |
} |
199 |
/* get starting frame */ |
200 |
if (seq <= 0) |
201 |
seq = 0; |
202 |
else if (prvr != NULL && isint(prvr)) { |
203 |
register int rn; /* skip to specified view */ |
204 |
if ((rn = atoi(prvr)) < seq) |
205 |
error(USER, "recover frame less than start frame"); |
206 |
if (pout == NULL) |
207 |
error(USER, "missing output file specification"); |
208 |
for ( ; seq < rn; seq++) |
209 |
if (nextview(stdin) == EOF) |
210 |
error(USER, "unexpected EOF on view input"); |
211 |
prvr = fbuf; /* mark for renaming */ |
212 |
} |
213 |
if (pout != NULL) { |
214 |
sprintf(fbuf, pout, seq); |
215 |
if (prvr != NULL && !strcmp(prvr, fbuf)) { /* rename */ |
216 |
fbuf2[0] = '\0'; |
217 |
if ((cp = rindex(fbuf, '/')) != NULL) |
218 |
strncpy(fbuf2, fbuf, cp-fbuf+1); |
219 |
strcat(fbuf2, RFTEMPLATE); |
220 |
prvr = mktemp(fbuf2); |
221 |
if (rename(fbuf, prvr) < 0 && errno != ENOENT) { |
222 |
sprintf(errmsg, |
223 |
"cannot rename \"%s\" to \"%s\"", |
224 |
fbuf, prvr); |
225 |
error(SYSTEM, errmsg); |
226 |
} |
227 |
} |
228 |
} |
229 |
/* render sequence */ |
230 |
do { |
231 |
if (seq && nextview(stdin) == EOF) |
232 |
break; |
233 |
if (pout != NULL) { |
234 |
sprintf(fbuf, pout, seq); |
235 |
if (freopen(fbuf, "w", stdout) == NULL) { |
236 |
sprintf(errmsg, |
237 |
"cannot open output file \"%s\"", fbuf); |
238 |
error(SYSTEM, errmsg); |
239 |
} |
240 |
dupheader(); |
241 |
} |
242 |
hres = hresolu; vres = vresolu; pa = pixaspect; |
243 |
if (prvr != NULL) |
244 |
if (viewfile(prvr, &ourview, &rs) <= 0 |
245 |
|| rs.or != PIXSTANDARD) { |
246 |
sprintf(errmsg, |
247 |
"cannot recover view parameters from \"%s\"", prvr); |
248 |
error(WARNING, errmsg); |
249 |
} else { |
250 |
pa = 0.0; |
251 |
hres = scanlen(&rs); |
252 |
vres = numscans(&rs); |
253 |
} |
254 |
if ((cp = setview(&ourview)) != NULL) |
255 |
error(USER, cp); |
256 |
normaspect(viewaspect(&ourview), &pa, &hres, &vres); |
257 |
if (seq) { |
258 |
if (ralrm > 0) { |
259 |
fprintf(stderr, "FRAME %d:", seq); |
260 |
fprintview(&ourview, stderr); |
261 |
putc('\n', stderr); |
262 |
fflush(stderr); |
263 |
} |
264 |
printf("FRAME=%d\n", seq); |
265 |
} |
266 |
fputs(VIEWSTR, stdout); |
267 |
fprintview(&ourview, stdout); |
268 |
putchar('\n'); |
269 |
if (pa < .99 || pa > 1.01) |
270 |
fputaspect(pa, stdout); |
271 |
fputformat(COLRFMT, stdout); |
272 |
putchar('\n'); |
273 |
if (zout != NULL) |
274 |
sprintf(cp=fbuf, zout, seq); |
275 |
else |
276 |
cp = NULL; |
277 |
render(cp, prvr); |
278 |
prvr = NULL; |
279 |
} while (seq++); |
280 |
} |
281 |
|
282 |
|
283 |
nextview(fp) /* get next view from fp */ |
284 |
FILE *fp; |
285 |
{ |
286 |
char linebuf[256]; |
287 |
|
288 |
while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
289 |
if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
290 |
return(0); |
291 |
return(EOF); |
292 |
} |
293 |
|
294 |
|
295 |
render(zfile, oldfile) /* render the scene */ |
296 |
char *zfile, *oldfile; |
297 |
{ |
298 |
extern long lseek(); |
299 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
300 |
float *zbar[MAXDIV+1]; /* z values */ |
301 |
char *sampdens; /* previous sample density */ |
302 |
int ypos; /* current scanline */ |
303 |
int ystep; /* current y step size */ |
304 |
int hstep; /* h step size */ |
305 |
int zfd; |
306 |
COLOR *colptr; |
307 |
float *zptr; |
308 |
register int i; |
309 |
/* allocate scanlines */ |
310 |
for (i = 0; i <= psample; i++) { |
311 |
scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR)); |
312 |
if (scanbar[i] == NULL) |
313 |
goto memerr; |
314 |
} |
315 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
316 |
ystep = (psample*99+70)/140; |
317 |
if (hstep > 2) { |
318 |
i = hres/hstep + 2; |
319 |
if ((sampdens = malloc(i)) == NULL) |
320 |
goto memerr; |
321 |
while (i--) |
322 |
sampdens[i] = hstep; |
323 |
} else |
324 |
sampdens = NULL; |
325 |
/* open z file */ |
326 |
if (zfile != NULL) { |
327 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
328 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
329 |
error(SYSTEM, errmsg); |
330 |
} |
331 |
for (i = 0; i <= psample; i++) { |
332 |
zbar[i] = (float *)malloc(hres*sizeof(float)); |
333 |
if (zbar[i] == NULL) |
334 |
goto memerr; |
335 |
} |
336 |
} else { |
337 |
zfd = -1; |
338 |
for (i = 0; i <= psample; i++) |
339 |
zbar[i] = NULL; |
340 |
} |
341 |
/* write out boundaries */ |
342 |
fprtresolu(hres, vres, stdout); |
343 |
/* recover file and compute first */ |
344 |
i = salvage(oldfile); |
345 |
if (zfd != -1 && i > 0 && |
346 |
lseek(zfd, (long)i*hres*sizeof(float), 0) == -1) |
347 |
error(SYSTEM, "z file seek error in render"); |
348 |
pctdone = 100.0*i/vres; |
349 |
if (ralrm > 0) /* report init stats */ |
350 |
report(); |
351 |
#ifndef BSD |
352 |
else |
353 |
#endif |
354 |
signal(SIGALRM, report); |
355 |
ypos = vres-1 - i; |
356 |
fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
357 |
/* compute scanlines */ |
358 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
359 |
/* bottom adjust? */ |
360 |
if (ypos < 0) { |
361 |
ystep += ypos; |
362 |
ypos = 0; |
363 |
} |
364 |
colptr = scanbar[ystep]; /* move base to top */ |
365 |
scanbar[ystep] = scanbar[0]; |
366 |
scanbar[0] = colptr; |
367 |
zptr = zbar[ystep]; |
368 |
zbar[ystep] = zbar[0]; |
369 |
zbar[0] = zptr; |
370 |
/* fill base line */ |
371 |
fillscanline(scanbar[0], zbar[0], sampdens, |
372 |
hres, ypos, hstep); |
373 |
/* fill bar */ |
374 |
fillscanbar(scanbar, zbar, hres, ypos, ystep); |
375 |
/* write it out */ |
376 |
#ifndef BSD |
377 |
signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
378 |
#endif |
379 |
for (i = ystep; i > 0; i--) { |
380 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
381 |
hres*sizeof(float)) |
382 |
< hres*sizeof(float)) |
383 |
goto writerr; |
384 |
if (fwritescan(scanbar[i], hres, stdout) < 0) |
385 |
goto writerr; |
386 |
} |
387 |
if (fflush(stdout) == EOF) |
388 |
goto writerr; |
389 |
/* record progress */ |
390 |
pctdone = 100.0*(vres-1-ypos)/vres; |
391 |
if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
392 |
report(); |
393 |
#ifndef BSD |
394 |
else |
395 |
signal(SIGALRM, report); |
396 |
#endif |
397 |
} |
398 |
/* clean up */ |
399 |
signal(SIGALRM, SIG_IGN); |
400 |
if (zfd != -1) { |
401 |
if (write(zfd, (char *)zbar[0], hres*sizeof(float)) |
402 |
< hres*sizeof(float)) |
403 |
goto writerr; |
404 |
if (close(zfd) == -1) |
405 |
goto writerr; |
406 |
for (i = 0; i <= psample; i++) |
407 |
free((char *)zbar[i]); |
408 |
} |
409 |
fwritescan(scanbar[0], hres, stdout); |
410 |
if (fflush(stdout) == EOF) |
411 |
goto writerr; |
412 |
for (i = 0; i <= psample; i++) |
413 |
free((char *)scanbar[i]); |
414 |
if (sampdens != NULL) |
415 |
free(sampdens); |
416 |
pctdone = 100.0; |
417 |
if (ralrm > 0) |
418 |
report(); |
419 |
return; |
420 |
writerr: |
421 |
error(SYSTEM, "write error in render"); |
422 |
memerr: |
423 |
error(SYSTEM, "out of memory in render"); |
424 |
} |
425 |
|
426 |
|
427 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
428 |
register COLOR *scanline; |
429 |
register float *zline; |
430 |
register char *sd; |
431 |
int xres, y, xstep; |
432 |
{ |
433 |
static int nc = 0; /* number of calls */ |
434 |
int bl = xstep, b = xstep; |
435 |
double z; |
436 |
register int i; |
437 |
|
438 |
z = pixvalue(scanline[0], 0, y); |
439 |
if (zline) zline[0] = z; |
440 |
/* zig-zag start for quincunx pattern */ |
441 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
442 |
if (i >= xres) { |
443 |
xstep += xres-1-i; |
444 |
i = xres-1; |
445 |
} |
446 |
z = pixvalue(scanline[i], i, y); |
447 |
if (zline) zline[i] = z; |
448 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
449 |
if (i <= xstep) |
450 |
b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
451 |
else |
452 |
b = fillsample(scanline+i-xstep, |
453 |
zline ? zline+i-xstep : NULL, |
454 |
i-xstep, y, xstep, 0, b/2); |
455 |
if (sd) *sd++ = nc & 1 ? bl : b; |
456 |
bl = b; |
457 |
} |
458 |
if (sd && nc & 1) *sd = bl; |
459 |
} |
460 |
|
461 |
|
462 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
463 |
register COLOR *scanbar[]; |
464 |
register float *zbar[]; |
465 |
int xres, y, ysize; |
466 |
{ |
467 |
COLOR vline[MAXDIV+1]; |
468 |
float zline[MAXDIV+1]; |
469 |
int b = ysize; |
470 |
register int i, j; |
471 |
|
472 |
for (i = 0; i < xres; i++) { |
473 |
|
474 |
copycolor(vline[0], scanbar[0][i]); |
475 |
copycolor(vline[ysize], scanbar[ysize][i]); |
476 |
if (zbar[0]) { |
477 |
zline[0] = zbar[0][i]; |
478 |
zline[ysize] = zbar[ysize][i]; |
479 |
} |
480 |
|
481 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
482 |
i, y, 0, ysize, b/2); |
483 |
|
484 |
for (j = 1; j < ysize; j++) |
485 |
copycolor(scanbar[j][i], vline[j]); |
486 |
if (zbar[0]) |
487 |
for (j = 1; j < ysize; j++) |
488 |
zbar[j][i] = zline[j]; |
489 |
} |
490 |
} |
491 |
|
492 |
|
493 |
int |
494 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
495 |
register COLOR *colline; |
496 |
register float *zline; |
497 |
int x, y; |
498 |
int xlen, ylen; |
499 |
int b; |
500 |
{ |
501 |
extern double fabs(); |
502 |
double ratio; |
503 |
double z; |
504 |
COLOR ctmp; |
505 |
int ncut; |
506 |
register int len; |
507 |
|
508 |
if (xlen > 0) /* x or y length is zero */ |
509 |
len = xlen; |
510 |
else |
511 |
len = ylen; |
512 |
|
513 |
if (len <= 1) /* limit recursion */ |
514 |
return(0); |
515 |
|
516 |
if (b > 0 |
517 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
518 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
519 |
|
520 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
521 |
if (zline) zline[len>>1] = z; |
522 |
ncut = 1; |
523 |
|
524 |
} else { /* interpolate */ |
525 |
|
526 |
copycolor(colline[len>>1], colline[len]); |
527 |
ratio = (double)(len>>1) / len; |
528 |
scalecolor(colline[len>>1], ratio); |
529 |
if (zline) zline[len>>1] = zline[len] * ratio; |
530 |
ratio = 1.0 - ratio; |
531 |
copycolor(ctmp, colline[0]); |
532 |
scalecolor(ctmp, ratio); |
533 |
addcolor(colline[len>>1], ctmp); |
534 |
if (zline) zline[len>>1] += zline[0] * ratio; |
535 |
ncut = 0; |
536 |
} |
537 |
/* recurse */ |
538 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
539 |
|
540 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
541 |
x+(xlen>>1), y+(ylen>>1), |
542 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
543 |
|
544 |
return(ncut); |
545 |
} |
546 |
|
547 |
|
548 |
double |
549 |
pixvalue(col, x, y) /* compute pixel value */ |
550 |
COLOR col; /* returned color */ |
551 |
int x, y; /* pixel position */ |
552 |
{ |
553 |
static RAY thisray; |
554 |
|
555 |
if (viewray(thisray.rorg, thisray.rdir, &ourview, |
556 |
(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) { |
557 |
setcolor(col, 0.0, 0.0, 0.0); |
558 |
return(0.0); |
559 |
} |
560 |
|
561 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
562 |
|
563 |
samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
564 |
|
565 |
rayvalue(&thisray); /* trace ray */ |
566 |
|
567 |
copycolor(col, thisray.rcol); /* return color */ |
568 |
|
569 |
return(thisray.rt); /* return distance */ |
570 |
} |
571 |
|
572 |
|
573 |
int |
574 |
salvage(oldfile) /* salvage scanlines from killed program */ |
575 |
char *oldfile; |
576 |
{ |
577 |
COLR *scanline; |
578 |
FILE *fp; |
579 |
int x, y; |
580 |
|
581 |
if (oldfile == NULL) |
582 |
return(0); |
583 |
|
584 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
585 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
586 |
error(WARNING, errmsg); |
587 |
return(0); |
588 |
} |
589 |
/* discard header */ |
590 |
getheader(fp, NULL); |
591 |
/* get picture size */ |
592 |
if (!fscnresolu(&x, &y, fp)) { |
593 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
594 |
error(WARNING, errmsg); |
595 |
fclose(fp); |
596 |
return(0); |
597 |
} |
598 |
|
599 |
if (x != hres || y != vres) { |
600 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
601 |
oldfile); |
602 |
error(USER, errmsg); |
603 |
} |
604 |
|
605 |
scanline = (COLR *)malloc(hres*sizeof(COLR)); |
606 |
if (scanline == NULL) |
607 |
error(SYSTEM, "out of memory in salvage"); |
608 |
for (y = 0; y < vres; y++) { |
609 |
if (freadcolrs(scanline, hres, fp) < 0) |
610 |
break; |
611 |
if (fwritecolrs(scanline, hres, stdout) < 0) |
612 |
goto writerr; |
613 |
} |
614 |
if (fflush(stdout) == EOF) |
615 |
goto writerr; |
616 |
free((char *)scanline); |
617 |
fclose(fp); |
618 |
unlink(oldfile); |
619 |
return(y); |
620 |
writerr: |
621 |
sprintf(errmsg, "write error during recovery of \"%s\"", oldfile); |
622 |
error(SYSTEM, errmsg); |
623 |
} |
624 |
|
625 |
|
626 |
int |
627 |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
628 |
register int x, y; |
629 |
int xres, yres; |
630 |
{ |
631 |
x -= y; |
632 |
while (x < 0) |
633 |
x += xres; |
634 |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
635 |
} |