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