1 |
/* Copyright (c) 1994 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* Interpolate and extrapolate pictures with different view parameters. |
9 |
* |
10 |
* Greg Ward 09Dec89 |
11 |
*/ |
12 |
|
13 |
#include "standard.h" |
14 |
|
15 |
#include <ctype.h> |
16 |
|
17 |
#include "view.h" |
18 |
|
19 |
#include "color.h" |
20 |
|
21 |
#include "resolu.h" |
22 |
|
23 |
#define pscan(y) (ourpict+(y)*hresolu) |
24 |
#define zscan(y) (ourzbuf+(y)*hresolu) |
25 |
|
26 |
#define F_FORE 1 /* fill foreground */ |
27 |
#define F_BACK 2 /* fill background */ |
28 |
|
29 |
#define PACKSIZ 256 /* max. calculation packet size */ |
30 |
|
31 |
#define RTCOM "rtrace -h- -ovl -fff " |
32 |
|
33 |
#define ABS(x) ((x)>0?(x):-(x)) |
34 |
|
35 |
struct position {int x,y; float z;}; |
36 |
|
37 |
#define NSTEPS 64 /* number steps in overlap prescan */ |
38 |
#define MINSTEP 4 /* minimum worthwhile preview step */ |
39 |
|
40 |
struct bound {int min,max;}; |
41 |
|
42 |
VIEW ourview = STDVIEW; /* desired view */ |
43 |
int hresolu = 512; /* horizontal resolution */ |
44 |
int vresolu = 512; /* vertical resolution */ |
45 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
46 |
|
47 |
double zeps = .02; /* allowed z epsilon */ |
48 |
|
49 |
COLR *ourpict; /* output picture */ |
50 |
float *ourzbuf; /* corresponding z-buffer */ |
51 |
|
52 |
char *progname; |
53 |
|
54 |
int fillo = F_FORE|F_BACK; /* selected fill options */ |
55 |
int fillsamp = 0; /* sample separation (0 == inf) */ |
56 |
extern int backfill(), rcalfill(); /* fill functions */ |
57 |
int (*fillfunc)() = backfill; /* selected fill function */ |
58 |
COLR backcolr = BLKCOLR; /* background color */ |
59 |
double backz = 0.0; /* background z value */ |
60 |
int normdist = 1; /* normalized distance? */ |
61 |
double ourexp = -1; /* output picture exposure */ |
62 |
|
63 |
VIEW theirview = STDVIEW; /* input view */ |
64 |
int gotview; /* got input view? */ |
65 |
int wrongformat = 0; /* input in another format? */ |
66 |
RESOLU tresolu; /* input resolution */ |
67 |
double theirexp; /* input picture exposure */ |
68 |
double theirs2ours[4][4]; /* transformation matrix */ |
69 |
int hasmatrix = 0; /* has transformation matrix */ |
70 |
|
71 |
int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */ |
72 |
#define childpid (PDesc[2]) |
73 |
unsigned short queue[PACKSIZ][2]; /* pending pixels */ |
74 |
int packsiz; /* actual packet size */ |
75 |
int queuesiz; /* number of pixels pending */ |
76 |
|
77 |
|
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main(argc, argv) /* interpolate pictures */ |
79 |
int argc; |
80 |
char *argv[]; |
81 |
{ |
82 |
#define check(ol,al) if (argv[i][ol] || \ |
83 |
badarg(argc-i-1,argv+i+1,al)) \ |
84 |
goto badopt |
85 |
int gotvfile = 0; |
86 |
char *zfile = NULL; |
87 |
char *err; |
88 |
int i, rval; |
89 |
|
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progname = argv[0]; |
91 |
|
92 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
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rval = getviewopt(&ourview, argc-i, argv+i); |
94 |
if (rval >= 0) { |
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i += rval; |
96 |
continue; |
97 |
} |
98 |
switch (argv[i][1]) { |
99 |
case 't': /* threshold */ |
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check(2,"f"); |
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zeps = atof(argv[++i]); |
102 |
break; |
103 |
case 'n': /* dist. normalized? */ |
104 |
check(2,NULL); |
105 |
normdist = !normdist; |
106 |
break; |
107 |
case 'f': /* fill type */ |
108 |
switch (argv[i][2]) { |
109 |
case '0': /* none */ |
110 |
check(3,NULL); |
111 |
fillo = 0; |
112 |
break; |
113 |
case 'f': /* foreground */ |
114 |
check(3,NULL); |
115 |
fillo = F_FORE; |
116 |
break; |
117 |
case 'b': /* background */ |
118 |
check(3,NULL); |
119 |
fillo = F_BACK; |
120 |
break; |
121 |
case 'a': /* all */ |
122 |
check(3,NULL); |
123 |
fillo = F_FORE|F_BACK; |
124 |
break; |
125 |
case 's': /* sample */ |
126 |
check(3,"i"); |
127 |
fillsamp = atoi(argv[++i]); |
128 |
break; |
129 |
case 'c': /* color */ |
130 |
check(3,"fff"); |
131 |
fillfunc = backfill; |
132 |
setcolr(backcolr, atof(argv[i+1]), |
133 |
atof(argv[i+2]), atof(argv[i+3])); |
134 |
i += 3; |
135 |
break; |
136 |
case 'z': /* z value */ |
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check(3,"f"); |
138 |
fillfunc = backfill; |
139 |
backz = atof(argv[++i]); |
140 |
break; |
141 |
case 'r': /* rtrace */ |
142 |
check(3,"s"); |
143 |
fillfunc = rcalfill; |
144 |
calstart(RTCOM, argv[++i]); |
145 |
break; |
146 |
default: |
147 |
goto badopt; |
148 |
} |
149 |
break; |
150 |
case 'z': /* z file */ |
151 |
check(2,"s"); |
152 |
zfile = argv[++i]; |
153 |
break; |
154 |
case 'x': /* x resolution */ |
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check(2,"i"); |
156 |
hresolu = atoi(argv[++i]); |
157 |
break; |
158 |
case 'y': /* y resolution */ |
159 |
check(2,"i"); |
160 |
vresolu = atoi(argv[++i]); |
161 |
break; |
162 |
case 'p': /* pixel aspect */ |
163 |
if (argv[i][2] != 'a') |
164 |
goto badopt; |
165 |
check(3,"f"); |
166 |
pixaspect = atof(argv[++i]); |
167 |
break; |
168 |
case 'v': /* view file */ |
169 |
if (argv[i][2] != 'f') |
170 |
goto badopt; |
171 |
check(3,"s"); |
172 |
gotvfile = viewfile(argv[++i], &ourview, 0, 0); |
173 |
if (gotvfile < 0) |
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syserror(argv[i]); |
175 |
else if (gotvfile == 0) { |
176 |
fprintf(stderr, "%s: bad view file\n", |
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argv[i]); |
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exit(1); |
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} |
180 |
break; |
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default: |
182 |
badopt: |
183 |
fprintf(stderr, "%s: command line error at '%s'\n", |
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progname, argv[i]); |
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goto userr; |
186 |
} |
187 |
} |
188 |
/* check arguments */ |
189 |
if ((argc-i)%2) |
190 |
goto userr; |
191 |
if (fillsamp == 1) |
192 |
fillo &= ~F_BACK; |
193 |
/* set view */ |
194 |
if ((err = setview(&ourview)) != NULL) { |
195 |
fprintf(stderr, "%s: %s\n", progname, err); |
196 |
exit(1); |
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} |
198 |
normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu); |
199 |
/* allocate frame */ |
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ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR)); |
201 |
ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float)); |
202 |
if (ourpict == NULL || ourzbuf == NULL) |
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syserror(progname); |
204 |
bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float)); |
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/* new header */ |
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newheader("RADIANCE", stdout); |
207 |
/* get input */ |
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for ( ; i < argc; i += 2) |
209 |
addpicture(argv[i], argv[i+1]); |
210 |
/* fill in spaces */ |
211 |
if (fillo&F_BACK) |
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backpicture(fillfunc, fillsamp); |
213 |
else |
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fillpicture(fillfunc); |
215 |
/* close calculation */ |
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caldone(); |
217 |
/* aft clipping */ |
218 |
clipaft(); |
219 |
/* add to header */ |
220 |
printargs(argc, argv, stdout); |
221 |
if (gotvfile) { |
222 |
fputs(VIEWSTR, stdout); |
223 |
fprintview(&ourview, stdout); |
224 |
putc('\n', stdout); |
225 |
} |
226 |
if (pixaspect < .99 || pixaspect > 1.01) |
227 |
fputaspect(pixaspect, stdout); |
228 |
if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005)) |
229 |
fputexpos(ourexp, stdout); |
230 |
fputformat(COLRFMT, stdout); |
231 |
putc('\n', stdout); |
232 |
/* write picture */ |
233 |
writepicture(); |
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/* write z file */ |
235 |
if (zfile != NULL) |
236 |
writedistance(zfile); |
237 |
|
238 |
exit(0); |
239 |
userr: |
240 |
fprintf(stderr, |
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"Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n", |
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progname); |
243 |
exit(1); |
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#undef check |
245 |
} |
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|
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|
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headline(s) /* process header string */ |
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char *s; |
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{ |
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char fmt[32]; |
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|
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if (isheadid(s)) |
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return; |
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if (formatval(fmt, s)) { |
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wrongformat = strcmp(fmt, COLRFMT); |
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return; |
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} |
259 |
putc('\t', stdout); |
260 |
fputs(s, stdout); |
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|
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if (isexpos(s)) { |
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theirexp *= exposval(s); |
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return; |
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} |
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if (isview(s) && sscanview(&theirview, s) > 0) |
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gotview++; |
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} |
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|
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|
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addpicture(pfile, zspec) /* add picture to output */ |
272 |
char *pfile, *zspec; |
273 |
{ |
274 |
FILE *pfp; |
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int zfd; |
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char *err; |
277 |
COLR *scanin; |
278 |
float *zin; |
279 |
struct position *plast; |
280 |
struct bound *xlim, ylim; |
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int y; |
282 |
/* open picture file */ |
283 |
if ((pfp = fopen(pfile, "r")) == NULL) |
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syserror(pfile); |
285 |
/* get header with exposure and view */ |
286 |
theirexp = 1.0; |
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gotview = 0; |
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printf("%s:\n", pfile); |
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getheader(pfp, headline, NULL); |
290 |
if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) { |
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fprintf(stderr, "%s: picture format error\n", pfile); |
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exit(1); |
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} |
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if (ourexp <= 0) |
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ourexp = theirexp; |
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else if (ABS(theirexp-ourexp) > .01*ourexp) |
297 |
fprintf(stderr, "%s: different exposure (warning)\n", pfile); |
298 |
if (err = setview(&theirview)) { |
299 |
fprintf(stderr, "%s: %s\n", pfile, err); |
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exit(1); |
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} |
302 |
/* compute transformation */ |
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hasmatrix = pixform(theirs2ours, &theirview, &ourview); |
304 |
/* get z specification or file */ |
305 |
zin = (float *)malloc(scanlen(&tresolu)*sizeof(float)); |
306 |
if (zin == NULL) |
307 |
syserror(progname); |
308 |
if ((zfd = open(zspec, O_RDONLY)) == -1) { |
309 |
double zvalue; |
310 |
register int x; |
311 |
if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0) |
312 |
syserror(zspec); |
313 |
for (x = scanlen(&tresolu); x-- > 0; ) |
314 |
zin[x] = zvalue; |
315 |
} |
316 |
/* compute transferrable perimeter */ |
317 |
xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound)); |
318 |
if (xlim == NULL) |
319 |
syserror(progname); |
320 |
if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */ |
321 |
free((char *)zin); |
322 |
free((char *)xlim); |
323 |
if (zfd != -1) |
324 |
close(zfd); |
325 |
fclose(pfp); |
326 |
return; |
327 |
} |
328 |
/* allocate scanlines */ |
329 |
scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR)); |
330 |
plast = (struct position *)calloc(scanlen(&tresolu), |
331 |
sizeof(struct position)); |
332 |
if (scanin == NULL | plast == NULL) |
333 |
syserror(progname); |
334 |
/* skip to starting point */ |
335 |
for (y = 0; y < ylim.min; y++) |
336 |
if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) { |
337 |
fprintf(stderr, "%s: read error\n", pfile); |
338 |
exit(1); |
339 |
} |
340 |
if (zfd != -1 && lseek(zfd, |
341 |
(long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0) |
342 |
syserror(zspec); |
343 |
/* load image */ |
344 |
for (y = ylim.min; y <= ylim.max; y++) { |
345 |
if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) { |
346 |
fprintf(stderr, "%s: read error\n", pfile); |
347 |
exit(1); |
348 |
} |
349 |
if (zfd != -1 && read(zfd, (char *)zin, |
350 |
scanlen(&tresolu)*sizeof(float)) |
351 |
< scanlen(&tresolu)*sizeof(float)) |
352 |
syserror(zspec); |
353 |
addscanline(xlim+y, y, scanin, zin, plast); |
354 |
} |
355 |
/* clean up */ |
356 |
free((char *)xlim); |
357 |
free((char *)scanin); |
358 |
free((char *)zin); |
359 |
free((char *)plast); |
360 |
fclose(pfp); |
361 |
if (zfd != -1) |
362 |
close(zfd); |
363 |
} |
364 |
|
365 |
|
366 |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
367 |
register double xfmat[4][4]; |
368 |
register VIEW *vw1, *vw2; |
369 |
{ |
370 |
double m4t[4][4]; |
371 |
|
372 |
if (vw1->type != VT_PER && vw1->type != VT_PAR) |
373 |
return(0); |
374 |
if (vw2->type != VT_PER && vw2->type != VT_PAR) |
375 |
return(0); |
376 |
setident4(xfmat); |
377 |
xfmat[0][0] = vw1->hvec[0]; |
378 |
xfmat[0][1] = vw1->hvec[1]; |
379 |
xfmat[0][2] = vw1->hvec[2]; |
380 |
xfmat[1][0] = vw1->vvec[0]; |
381 |
xfmat[1][1] = vw1->vvec[1]; |
382 |
xfmat[1][2] = vw1->vvec[2]; |
383 |
xfmat[2][0] = vw1->vdir[0]; |
384 |
xfmat[2][1] = vw1->vdir[1]; |
385 |
xfmat[2][2] = vw1->vdir[2]; |
386 |
xfmat[3][0] = vw1->vp[0]; |
387 |
xfmat[3][1] = vw1->vp[1]; |
388 |
xfmat[3][2] = vw1->vp[2]; |
389 |
setident4(m4t); |
390 |
m4t[0][0] = vw2->hvec[0]/vw2->hn2; |
391 |
m4t[1][0] = vw2->hvec[1]/vw2->hn2; |
392 |
m4t[2][0] = vw2->hvec[2]/vw2->hn2; |
393 |
m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2; |
394 |
m4t[0][1] = vw2->vvec[0]/vw2->vn2; |
395 |
m4t[1][1] = vw2->vvec[1]/vw2->vn2; |
396 |
m4t[2][1] = vw2->vvec[2]/vw2->vn2; |
397 |
m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2; |
398 |
m4t[0][2] = vw2->vdir[0]; |
399 |
m4t[1][2] = vw2->vdir[1]; |
400 |
m4t[2][2] = vw2->vdir[2]; |
401 |
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
402 |
multmat4(xfmat, xfmat, m4t); |
403 |
return(1); |
404 |
} |
405 |
|
406 |
|
407 |
addscanline(xl, y, pline, zline, lasty) /* add scanline to output */ |
408 |
struct bound *xl; |
409 |
int y; |
410 |
COLR *pline; |
411 |
float *zline; |
412 |
struct position *lasty; /* input/output */ |
413 |
{ |
414 |
FVECT pos; |
415 |
struct position lastx, newpos; |
416 |
register int x; |
417 |
|
418 |
lastx.z = 0; |
419 |
for (x = xl->max; x >= xl->min; x--) { |
420 |
pix2loc(pos, &tresolu, x, y); |
421 |
pos[2] = zline[x]; |
422 |
if (movepixel(pos) < 0) { |
423 |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
424 |
continue; |
425 |
} |
426 |
newpos.x = pos[0] * hresolu; |
427 |
newpos.y = pos[1] * vresolu; |
428 |
newpos.z = zline[x]; |
429 |
/* add pixel to our image */ |
430 |
if (pos[0] >= 0 && newpos.x < hresolu |
431 |
&& pos[1] >= 0 && newpos.y < vresolu) { |
432 |
addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]); |
433 |
lasty[x].x = lastx.x = newpos.x; |
434 |
lasty[x].y = lastx.y = newpos.y; |
435 |
lasty[x].z = lastx.z = newpos.z; |
436 |
} else |
437 |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
438 |
} |
439 |
} |
440 |
|
441 |
|
442 |
addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */ |
443 |
struct position *p0, *p1, *p2; |
444 |
COLR pix; |
445 |
double z; |
446 |
{ |
447 |
double zt = 2.*zeps*p0->z; /* threshold */ |
448 |
int s1x, s1y, s2x, s2y; /* step sizes */ |
449 |
int l1, l2, c1, c2; /* side lengths and counters */ |
450 |
int p1isy; /* p0p1 along y? */ |
451 |
int x1, y1; /* p1 position */ |
452 |
register int x, y; /* final position */ |
453 |
|
454 |
/* compute vector p0p1 */ |
455 |
if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) { |
456 |
s1x = p1->x - p0->x; |
457 |
s1y = p1->y - p0->y; |
458 |
l1 = ABS(s1x); |
459 |
if (p1isy = (ABS(s1y) > l1)) |
460 |
l1 = ABS(s1y); |
461 |
} else { |
462 |
l1 = s1x = s1y = 1; |
463 |
p1isy = -1; |
464 |
} |
465 |
/* compute vector p0p2 */ |
466 |
if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) { |
467 |
s2x = p2->x - p0->x; |
468 |
s2y = p2->y - p0->y; |
469 |
if (p1isy == 1) |
470 |
l2 = ABS(s2x); |
471 |
else { |
472 |
l2 = ABS(s2y); |
473 |
if (p1isy != 0 && ABS(s2x) > l2) |
474 |
l2 = ABS(s2x); |
475 |
} |
476 |
} else |
477 |
l2 = s2x = s2y = 1; |
478 |
/* fill the parallelogram */ |
479 |
for (c1 = l1; c1-- > 0; ) { |
480 |
x1 = p0->x + c1*s1x/l1; |
481 |
y1 = p0->y + c1*s1y/l1; |
482 |
for (c2 = l2; c2-- > 0; ) { |
483 |
x = x1 + c2*s2x/l2; |
484 |
if (x < 0 || x >= hresolu) |
485 |
continue; |
486 |
y = y1 + c2*s2y/l2; |
487 |
if (y < 0 || y >= vresolu) |
488 |
continue; |
489 |
if (zscan(y)[x] <= 0 || zscan(y)[x]-z |
490 |
> zeps*zscan(y)[x]) { |
491 |
zscan(y)[x] = z; |
492 |
copycolr(pscan(y)[x], pix); |
493 |
} |
494 |
} |
495 |
} |
496 |
} |
497 |
|
498 |
|
499 |
movepixel(pos) /* reposition image point */ |
500 |
FVECT pos; |
501 |
{ |
502 |
double d0, d1; |
503 |
FVECT pt, direc; |
504 |
|
505 |
if (pos[2] <= 0) /* empty pixel */ |
506 |
return(-1); |
507 |
if (normdist && theirview.type == VT_PER) { /* adjust distance */ |
508 |
d0 = pos[0] + theirview.hoff - .5; |
509 |
d1 = pos[1] + theirview.voff - .5; |
510 |
pos[2] /= sqrt(1. + d0*d0*theirview.hn2 + d1*d1*theirview.vn2); |
511 |
} |
512 |
if (hasmatrix) { |
513 |
pos[0] += theirview.hoff - .5; |
514 |
pos[1] += theirview.voff - .5; |
515 |
if (theirview.type == VT_PER) { |
516 |
pos[0] *= pos[2]; |
517 |
pos[1] *= pos[2]; |
518 |
} |
519 |
multp3(pos, pos, theirs2ours); |
520 |
if (pos[2] <= 0) |
521 |
return(-1); |
522 |
if (ourview.type == VT_PER) { |
523 |
pos[0] /= pos[2]; |
524 |
pos[1] /= pos[2]; |
525 |
} |
526 |
pos[0] += .5 - ourview.hoff; |
527 |
pos[1] += .5 - ourview.voff; |
528 |
return(0); |
529 |
} |
530 |
if (viewray(pt, direc, &theirview, pos[0], pos[1]) < -FTINY) |
531 |
return(-1); |
532 |
pt[0] += direc[0]*pos[2]; |
533 |
pt[1] += direc[1]*pos[2]; |
534 |
pt[2] += direc[2]*pos[2]; |
535 |
viewloc(pos, &ourview, pt); |
536 |
if (pos[2] <= 0) |
537 |
return(-1); |
538 |
return(0); |
539 |
} |
540 |
|
541 |
|
542 |
getperim(xl, yl, zline, zfd) /* compute overlapping image area */ |
543 |
register struct bound *xl; |
544 |
struct bound *yl; |
545 |
float *zline; |
546 |
int zfd; |
547 |
{ |
548 |
int step; |
549 |
FVECT pos; |
550 |
register int x, y; |
551 |
/* set up step size */ |
552 |
if (scanlen(&tresolu) < numscans(&tresolu)) |
553 |
step = scanlen(&tresolu)/NSTEPS; |
554 |
else |
555 |
step = numscans(&tresolu)/NSTEPS; |
556 |
if (step < MINSTEP) { /* not worth cropping? */ |
557 |
yl->min = 0; |
558 |
yl->max = numscans(&tresolu) - 1; |
559 |
x = scanlen(&tresolu) - 1; |
560 |
for (y = numscans(&tresolu); y--; ) { |
561 |
xl[y].min = 0; |
562 |
xl[y].max = x; |
563 |
} |
564 |
return(1); |
565 |
} |
566 |
yl->min = 32000; yl->max = 0; /* search for points on image */ |
567 |
for (y = step - 1; y < numscans(&tresolu); y += step) { |
568 |
if (zfd != -1) { |
569 |
if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float), |
570 |
0) < 0) |
571 |
syserror("lseek"); |
572 |
if (read(zfd, (char *)zline, |
573 |
scanlen(&tresolu)*sizeof(float)) |
574 |
< scanlen(&tresolu)*sizeof(float)) |
575 |
syserror("read"); |
576 |
} |
577 |
xl[y].min = 32000; xl[y].max = 0; /* x max */ |
578 |
for (x = scanlen(&tresolu); (x -= step) > 0; ) { |
579 |
pix2loc(pos, &tresolu, x, y); |
580 |
pos[2] = zline[x]; |
581 |
if (movepixel(pos) == 0 && pos[0] >= 0 && |
582 |
pos[0] < 1 && pos[1] >= 0 && |
583 |
pos[1] < 1) { |
584 |
xl[y].max = x + step - 1; |
585 |
xl[y].min = x - step + 1; /* x min */ |
586 |
if (xl[y].min < 0) |
587 |
xl[y].min = 0; |
588 |
for (x = step - 1; x < xl[y].max; x += step) { |
589 |
pix2loc(pos, &tresolu, x, y); |
590 |
pos[2] = zline[x]; |
591 |
if (movepixel(pos) == 0 && |
592 |
pos[0] >= 0 && |
593 |
pos[0] < 1 && |
594 |
pos[1] >= 0 && |
595 |
pos[1] < 1) { |
596 |
xl[y].min = x - step + 1; |
597 |
break; |
598 |
} |
599 |
} |
600 |
if (y < yl->min) /* y limits */ |
601 |
yl->min = y - step + 1; |
602 |
yl->max = y + step - 1; |
603 |
break; |
604 |
} |
605 |
} |
606 |
/* fill in between */ |
607 |
if (y < step) { |
608 |
xl[y-1].min = xl[y].min; |
609 |
xl[y-1].max = xl[y].max; |
610 |
} else { |
611 |
if (xl[y].min < xl[y-step].min) |
612 |
xl[y-1].min = xl[y].min; |
613 |
else |
614 |
xl[y-1].min = xl[y-step].min; |
615 |
if (xl[y].max > xl[y-step].max) |
616 |
xl[y-1].max = xl[y].max; |
617 |
else |
618 |
xl[y-1].max = xl[y-step].max; |
619 |
} |
620 |
for (x = 2; x < step; x++) |
621 |
copystruct(xl+y-x, xl+y-1); |
622 |
} |
623 |
if (yl->max >= numscans(&tresolu)) |
624 |
yl->max = numscans(&tresolu) - 1; |
625 |
for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */ |
626 |
copystruct(xl+x, xl+y); |
627 |
return(yl->max >= yl->min); |
628 |
} |
629 |
|
630 |
|
631 |
backpicture(fill, samp) /* background fill algorithm */ |
632 |
int (*fill)(); |
633 |
int samp; |
634 |
{ |
635 |
int *yback, xback; |
636 |
int y; |
637 |
register int x, i; |
638 |
/* get back buffer */ |
639 |
yback = (int *)malloc(hresolu*sizeof(int)); |
640 |
if (yback == NULL) |
641 |
syserror(progname); |
642 |
for (x = 0; x < hresolu; x++) |
643 |
yback[x] = -2; |
644 |
/* |
645 |
* Xback and yback are the pixel locations of suitable |
646 |
* background values in each direction. |
647 |
* A value of -2 means unassigned, and -1 means |
648 |
* that there is no suitable background in this direction. |
649 |
*/ |
650 |
/* fill image */ |
651 |
for (y = 0; y < vresolu; y++) { |
652 |
xback = -2; |
653 |
for (x = 0; x < hresolu; x++) |
654 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
655 |
/* |
656 |
* First, find background from above or below. |
657 |
* (farthest assigned pixel) |
658 |
*/ |
659 |
if (yback[x] == -2) { |
660 |
for (i = y+1; i < vresolu; i++) |
661 |
if (zscan(i)[x] > 0) |
662 |
break; |
663 |
if (i < vresolu |
664 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
665 |
yback[x] = i; |
666 |
else |
667 |
yback[x] = y-1; |
668 |
} |
669 |
/* |
670 |
* Next, find background from left or right. |
671 |
*/ |
672 |
if (xback == -2) { |
673 |
for (i = x+1; i < hresolu; i++) |
674 |
if (zscan(y)[i] > 0) |
675 |
break; |
676 |
if (i < hresolu |
677 |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
678 |
xback = i; |
679 |
else |
680 |
xback = x-1; |
681 |
} |
682 |
/* |
683 |
* If we have no background for this pixel, |
684 |
* use the given fill function. |
685 |
*/ |
686 |
if (xback < 0 && yback[x] < 0) |
687 |
goto fillit; |
688 |
/* |
689 |
* Compare, and use the background that is |
690 |
* farther, unless one of them is next to us. |
691 |
* If the background is too distant, call |
692 |
* the fill function. |
693 |
*/ |
694 |
if ( yback[x] < 0 |
695 |
|| (xback >= 0 && ABS(x-xback) <= 1) |
696 |
|| ( ABS(y-yback[x]) > 1 |
697 |
&& zscan(yback[x])[x] |
698 |
< zscan(y)[xback] ) ) { |
699 |
if (samp > 0 && ABS(x-xback) >= samp) |
700 |
goto fillit; |
701 |
copycolr(pscan(y)[x],pscan(y)[xback]); |
702 |
zscan(y)[x] = zscan(y)[xback]; |
703 |
} else { |
704 |
if (samp > 0 && ABS(y-yback[x]) > samp) |
705 |
goto fillit; |
706 |
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
707 |
zscan(y)[x] = zscan(yback[x])[x]; |
708 |
} |
709 |
continue; |
710 |
fillit: |
711 |
(*fill)(x,y); |
712 |
if (fill == rcalfill) { /* use it */ |
713 |
clearqueue(); |
714 |
xback = x; |
715 |
yback[x] = y; |
716 |
} |
717 |
} else { /* full pixel */ |
718 |
yback[x] = -2; |
719 |
xback = -2; |
720 |
} |
721 |
} |
722 |
free((char *)yback); |
723 |
} |
724 |
|
725 |
|
726 |
fillpicture(fill) /* paint in empty pixels using fill */ |
727 |
int (*fill)(); |
728 |
{ |
729 |
register int x, y; |
730 |
|
731 |
for (y = 0; y < vresolu; y++) |
732 |
for (x = 0; x < hresolu; x++) |
733 |
if (zscan(y)[x] <= 0) |
734 |
(*fill)(x,y); |
735 |
} |
736 |
|
737 |
|
738 |
clipaft() /* perform aft clipping as indicated */ |
739 |
{ |
740 |
register int x, y; |
741 |
double tstdist; |
742 |
double yzn2, vx; |
743 |
|
744 |
if (ourview.vaft <= FTINY) |
745 |
return; |
746 |
tstdist = ourview.vaft - ourview.vfore; |
747 |
for (y = 0; y < vresolu; y++) { |
748 |
if (ourview.type == VT_PER) { /* adjust distance */ |
749 |
yzn2 = (y+.5)/vresolu + ourview.voff - .5; |
750 |
yzn2 = 1. + yzn2*yzn2*ourview.vn2; |
751 |
tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2); |
752 |
} |
753 |
for (x = 0; x < hresolu; x++) |
754 |
if (zscan(y)[x] > tstdist) { |
755 |
if (ourview.type == VT_PER) { |
756 |
vx = (x+.5)/hresolu + ourview.hoff - .5; |
757 |
if (zscan(y)[x] <= (ourview.vaft - |
758 |
ourview.vfore) * |
759 |
sqrt(vx*vx*ourview.hn2 + yzn2)) |
760 |
continue; |
761 |
} |
762 |
bzero(pscan(y)[x], sizeof(COLR)); |
763 |
zscan(y)[x] = 0.0; |
764 |
} |
765 |
} |
766 |
} |
767 |
|
768 |
|
769 |
writepicture() /* write out picture */ |
770 |
{ |
771 |
int y; |
772 |
|
773 |
fprtresolu(hresolu, vresolu, stdout); |
774 |
for (y = vresolu-1; y >= 0; y--) |
775 |
if (fwritecolrs(pscan(y), hresolu, stdout) < 0) |
776 |
syserror(progname); |
777 |
} |
778 |
|
779 |
|
780 |
writedistance(fname) /* write out z file */ |
781 |
char *fname; |
782 |
{ |
783 |
int donorm = normdist && ourview.type == VT_PER; |
784 |
int fd; |
785 |
int y; |
786 |
float *zout; |
787 |
|
788 |
if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1) |
789 |
syserror(fname); |
790 |
if (donorm |
791 |
&& (zout = (float *)malloc(hresolu*sizeof(float))) == NULL) |
792 |
syserror(progname); |
793 |
for (y = vresolu-1; y >= 0; y--) { |
794 |
if (donorm) { |
795 |
double vx, yzn2; |
796 |
register int x; |
797 |
yzn2 = (y+.5)/vresolu + ourview.voff - .5; |
798 |
yzn2 = 1. + yzn2*yzn2*ourview.vn2; |
799 |
for (x = 0; x < hresolu; x++) { |
800 |
vx = (x+.5)/hresolu + ourview.hoff - .5; |
801 |
zout[x] = zscan(y)[x] |
802 |
* sqrt(vx*vx*ourview.hn2 + yzn2); |
803 |
} |
804 |
} else |
805 |
zout = zscan(y); |
806 |
if (write(fd, (char *)zout, hresolu*sizeof(float)) |
807 |
< hresolu*sizeof(float)) |
808 |
syserror(fname); |
809 |
} |
810 |
if (donorm) |
811 |
free((char *)zout); |
812 |
close(fd); |
813 |
} |
814 |
|
815 |
|
816 |
isfloat(s) /* see if string is floating number */ |
817 |
register char *s; |
818 |
{ |
819 |
for ( ; *s; s++) |
820 |
if ((*s < '0' || *s > '9') && *s != '.' && *s != '-' |
821 |
&& *s != 'e' && *s != 'E' && *s != '+') |
822 |
return(0); |
823 |
return(1); |
824 |
} |
825 |
|
826 |
|
827 |
backfill(x, y) /* fill pixel with background */ |
828 |
int x, y; |
829 |
{ |
830 |
register BYTE *dest = pscan(y)[x]; |
831 |
|
832 |
copycolr(dest, backcolr); |
833 |
zscan(y)[x] = backz; |
834 |
} |
835 |
|
836 |
|
837 |
calstart(prog, args) /* start fill calculation */ |
838 |
char *prog, *args; |
839 |
{ |
840 |
char combuf[512]; |
841 |
char *argv[64]; |
842 |
int rval; |
843 |
register char **wp, *cp; |
844 |
|
845 |
if (childpid != -1) { |
846 |
fprintf(stderr, "%s: too many calculations\n", progname); |
847 |
exit(1); |
848 |
} |
849 |
strcpy(combuf, prog); |
850 |
strcat(combuf, args); |
851 |
cp = combuf; |
852 |
wp = argv; |
853 |
for ( ; ; ) { |
854 |
while (isspace(*cp)) /* nullify spaces */ |
855 |
*cp++ = '\0'; |
856 |
if (!*cp) /* all done? */ |
857 |
break; |
858 |
*wp++ = cp; /* add argument to list */ |
859 |
while (*++cp && !isspace(*cp)) |
860 |
; |
861 |
} |
862 |
*wp = NULL; |
863 |
/* start process */ |
864 |
if ((rval = open_process(PDesc, argv)) < 0) |
865 |
syserror(progname); |
866 |
if (rval == 0) { |
867 |
fprintf(stderr, "%s: command not found\n", argv[0]); |
868 |
exit(1); |
869 |
} |
870 |
packsiz = rval/(6*sizeof(float)) - 1; |
871 |
if (packsiz > PACKSIZ) |
872 |
packsiz = PACKSIZ; |
873 |
queuesiz = 0; |
874 |
} |
875 |
|
876 |
|
877 |
caldone() /* done with calculation */ |
878 |
{ |
879 |
if (childpid == -1) |
880 |
return; |
881 |
clearqueue(); |
882 |
close_process(PDesc); |
883 |
childpid = -1; |
884 |
} |
885 |
|
886 |
|
887 |
rcalfill(x, y) /* fill with ray-calculated pixel */ |
888 |
int x, y; |
889 |
{ |
890 |
if (queuesiz >= packsiz) /* flush queue if needed */ |
891 |
clearqueue(); |
892 |
/* add position to queue */ |
893 |
queue[queuesiz][0] = x; |
894 |
queue[queuesiz][1] = y; |
895 |
queuesiz++; |
896 |
} |
897 |
|
898 |
|
899 |
clearqueue() /* process queue */ |
900 |
{ |
901 |
FVECT orig, dir; |
902 |
float fbuf[6*(PACKSIZ+1)]; |
903 |
register float *fbp; |
904 |
register int i; |
905 |
|
906 |
if (queuesiz == 0) |
907 |
return; |
908 |
fbp = fbuf; |
909 |
for (i = 0; i < queuesiz; i++) { |
910 |
viewray(orig, dir, &ourview, |
911 |
(queue[i][0]+.5)/hresolu, |
912 |
(queue[i][1]+.5)/vresolu); |
913 |
*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2]; |
914 |
*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2]; |
915 |
} |
916 |
/* mark end and get results */ |
917 |
bzero((char *)fbp, 6*sizeof(float)); |
918 |
if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz, |
919 |
6*sizeof(float)*(queuesiz+1)) != |
920 |
4*sizeof(float)*queuesiz) { |
921 |
fprintf(stderr, "%s: error reading from rtrace process\n", |
922 |
progname); |
923 |
exit(1); |
924 |
} |
925 |
fbp = fbuf; |
926 |
for (i = 0; i < queuesiz; i++) { |
927 |
if (ourexp > 0 && ourexp != 1.0) { |
928 |
fbp[0] *= ourexp; |
929 |
fbp[1] *= ourexp; |
930 |
fbp[2] *= ourexp; |
931 |
} |
932 |
setcolr(pscan(queue[i][1])[queue[i][0]], |
933 |
fbp[0], fbp[1], fbp[2]); |
934 |
zscan(queue[i][1])[queue[i][0]] = fbp[3]; |
935 |
fbp += 4; |
936 |
} |
937 |
queuesiz = 0; |
938 |
} |
939 |
|
940 |
|
941 |
syserror(s) /* report error and exit */ |
942 |
char *s; |
943 |
{ |
944 |
perror(s); |
945 |
exit(1); |
946 |
} |