| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: pcomb.c,v 2.22 2003/02/22 02:07:27 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Combine picture files according to calcomp functions. |
| 6 |
* |
| 7 |
* 1/4/89 |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "standard.h" |
| 11 |
#include "color.h" |
| 12 |
#include "calcomp.h" |
| 13 |
#include "view.h" |
| 14 |
|
| 15 |
#define MAXINP 32 /* maximum number of input files */ |
| 16 |
#define WINSIZ 64 /* scanline window size */ |
| 17 |
#define MIDSCN ((WINSIZ-1)/2+1) |
| 18 |
|
| 19 |
struct { |
| 20 |
char *name; /* file or command name */ |
| 21 |
FILE *fp; /* stream pointer */ |
| 22 |
VIEW vw; /* view for picture */ |
| 23 |
RESOLU rs; /* image resolution and orientation */ |
| 24 |
float pa; /* pixel aspect ratio */ |
| 25 |
COLOR *scan[WINSIZ]; /* input scanline window */ |
| 26 |
COLOR coef; /* coefficient */ |
| 27 |
COLOR expos; /* recorded exposure */ |
| 28 |
} input[MAXINP]; /* input pictures */ |
| 29 |
|
| 30 |
int nfiles; /* number of input files */ |
| 31 |
|
| 32 |
char ourfmt[LPICFMT+1] = PICFMT; /* input picture format */ |
| 33 |
|
| 34 |
char Command[] = "<Command>"; |
| 35 |
char vcolin[3][4] = {"ri", "gi", "bi"}; |
| 36 |
char vcolout[3][4] = {"ro", "go", "bo"}; |
| 37 |
char vbrtin[] = "li"; |
| 38 |
char vbrtout[] = "lo"; |
| 39 |
char vcolexp[3][4] = {"re", "ge", "be"}; |
| 40 |
char vbrtexp[] = "le"; |
| 41 |
char vpixaspect[] = "pa"; |
| 42 |
|
| 43 |
char vray[7][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz", "T"}; |
| 44 |
|
| 45 |
char vpsize[] = "S"; |
| 46 |
|
| 47 |
char vnfiles[] = "nfiles"; |
| 48 |
char vwhteff[] = "WE"; |
| 49 |
char vxmax[] = "xmax"; |
| 50 |
char vymax[] = "ymax"; |
| 51 |
char vxres[] = "xres"; |
| 52 |
char vyres[] = "yres"; |
| 53 |
char vxpos[] = "x"; |
| 54 |
char vypos[] = "y"; |
| 55 |
|
| 56 |
int nowarn = 0; /* no warning messages? */ |
| 57 |
|
| 58 |
int xmax = 0, ymax = 0; /* input resolution */ |
| 59 |
|
| 60 |
int xscan, yscan; /* input position */ |
| 61 |
|
| 62 |
int xres, yres; /* output resolution */ |
| 63 |
|
| 64 |
int xpos, ypos; /* output position */ |
| 65 |
|
| 66 |
char *progname; /* global argv[0] */ |
| 67 |
|
| 68 |
int wrongformat = 0; |
| 69 |
int gotview; |
| 70 |
|
| 71 |
FILE *popen(); |
| 72 |
|
| 73 |
extern char *emalloc(); |
| 74 |
|
| 75 |
|
| 76 |
main(argc, argv) |
| 77 |
int argc; |
| 78 |
char *argv[]; |
| 79 |
{ |
| 80 |
int original; |
| 81 |
double f; |
| 82 |
int a, i; |
| 83 |
SET_DEFAULT_BINARY(); |
| 84 |
SET_FILE_BINARY(stdin); |
| 85 |
SET_FILE_BINARY(stdout); |
| 86 |
progname = argv[0]; |
| 87 |
/* scan options */ |
| 88 |
for (a = 1; a < argc; a++) { |
| 89 |
if (argv[a][0] == '-') |
| 90 |
switch (argv[a][1]) { |
| 91 |
case 'x': |
| 92 |
case 'y': |
| 93 |
a++; |
| 94 |
continue; |
| 95 |
case 'w': |
| 96 |
nowarn = !nowarn; |
| 97 |
continue; |
| 98 |
case 'f': |
| 99 |
case 'e': |
| 100 |
a++; |
| 101 |
continue; |
| 102 |
} |
| 103 |
break; |
| 104 |
} |
| 105 |
newheader("RADIANCE", stdout); /* start header */ |
| 106 |
fputnow(stdout); |
| 107 |
/* process files */ |
| 108 |
for (nfiles = 0; nfiles < MAXINP; nfiles++) { |
| 109 |
setcolor(input[nfiles].coef, 1.0, 1.0, 1.0); |
| 110 |
setcolor(input[nfiles].expos, 1.0, 1.0, 1.0); |
| 111 |
copystruct(&input[nfiles].vw, &stdview); |
| 112 |
input[nfiles].pa = 1.0; |
| 113 |
} |
| 114 |
nfiles = 0; |
| 115 |
original = 0; |
| 116 |
for ( ; a < argc; a++) { |
| 117 |
if (nfiles >= MAXINP) { |
| 118 |
eputs(argv[0]); |
| 119 |
eputs(": too many picture files\n"); |
| 120 |
quit(1); |
| 121 |
} |
| 122 |
if (argv[a][0] == '-') |
| 123 |
switch (argv[a][1]) { |
| 124 |
case '\0': |
| 125 |
input[nfiles].name = "<stdin>"; |
| 126 |
input[nfiles].fp = stdin; |
| 127 |
break; |
| 128 |
case 'o': |
| 129 |
original++; |
| 130 |
continue; |
| 131 |
case 's': |
| 132 |
f = atof(argv[++a]); |
| 133 |
scalecolor(input[nfiles].coef, f); |
| 134 |
continue; |
| 135 |
case 'c': |
| 136 |
colval(input[nfiles].coef,RED)*=atof(argv[++a]); |
| 137 |
colval(input[nfiles].coef,GRN)*=atof(argv[++a]); |
| 138 |
colval(input[nfiles].coef,BLU)*=atof(argv[++a]); |
| 139 |
continue; |
| 140 |
default: |
| 141 |
goto usage; |
| 142 |
} |
| 143 |
else { |
| 144 |
if (argv[a][0] == '!') { |
| 145 |
input[nfiles].name = Command; |
| 146 |
input[nfiles].fp = popen(argv[a]+1, "r"); |
| 147 |
} else { |
| 148 |
input[nfiles].name = argv[a]; |
| 149 |
input[nfiles].fp = fopen(argv[a], "r"); |
| 150 |
} |
| 151 |
if (input[nfiles].fp == NULL) { |
| 152 |
perror(argv[a]); |
| 153 |
quit(1); |
| 154 |
} |
| 155 |
} |
| 156 |
checkfile(); |
| 157 |
if (original) { |
| 158 |
colval(input[nfiles].coef,RED) /= |
| 159 |
colval(input[nfiles].expos,RED); |
| 160 |
colval(input[nfiles].coef,GRN) /= |
| 161 |
colval(input[nfiles].expos,GRN); |
| 162 |
colval(input[nfiles].coef,BLU) /= |
| 163 |
colval(input[nfiles].expos,BLU); |
| 164 |
setcolor(input[nfiles].expos, 1.0, 1.0, 1.0); |
| 165 |
} |
| 166 |
nfiles++; |
| 167 |
original = 0; |
| 168 |
} |
| 169 |
init(); /* set constants */ |
| 170 |
/* go back and get expressions */ |
| 171 |
for (a = 1; a < argc; a++) { |
| 172 |
if (argv[a][0] == '-') |
| 173 |
switch (argv[a][1]) { |
| 174 |
case 'x': |
| 175 |
varset(vxres, ':', eval(argv[++a])); |
| 176 |
continue; |
| 177 |
case 'y': |
| 178 |
varset(vyres, ':', eval(argv[++a])); |
| 179 |
continue; |
| 180 |
case 'w': |
| 181 |
continue; |
| 182 |
case 'f': |
| 183 |
fcompile(argv[++a]); |
| 184 |
continue; |
| 185 |
case 'e': |
| 186 |
scompile(argv[++a], NULL, 0); |
| 187 |
continue; |
| 188 |
} |
| 189 |
break; |
| 190 |
} |
| 191 |
/* set/get output resolution */ |
| 192 |
if (!vardefined(vxres)) |
| 193 |
varset(vxres, ':', (double)xmax); |
| 194 |
if (!vardefined(vyres)) |
| 195 |
varset(vyres, ':', (double)ymax); |
| 196 |
xres = varvalue(vxres) + .5; |
| 197 |
yres = varvalue(vyres) + .5; |
| 198 |
if (xres <= 0 || yres <= 0) { |
| 199 |
eputs(argv[0]); |
| 200 |
eputs(": illegal output resolution\n"); |
| 201 |
quit(1); |
| 202 |
} |
| 203 |
/* complete header */ |
| 204 |
printargs(argc, argv, stdout); |
| 205 |
if (strcmp(ourfmt, PICFMT)) |
| 206 |
fputformat(ourfmt, stdout); /* print format if known */ |
| 207 |
putchar('\n'); |
| 208 |
fprtresolu(xres, yres, stdout); |
| 209 |
/* combine pictures */ |
| 210 |
combine(); |
| 211 |
quit(0); |
| 212 |
usage: |
| 213 |
eputs("Usage: "); |
| 214 |
eputs(argv[0]); |
| 215 |
eputs( |
| 216 |
" [-w][-x xr][-y yr][-e expr][-f file] [ [-o][-s f][-c r g b] pic ..]\n"); |
| 217 |
quit(1); |
| 218 |
} |
| 219 |
|
| 220 |
|
| 221 |
tabputs(s) /* put out string preceded by a tab */ |
| 222 |
char *s; |
| 223 |
{ |
| 224 |
char fmt[32]; |
| 225 |
double d; |
| 226 |
COLOR ctmp; |
| 227 |
|
| 228 |
if (isheadid(s)) /* header id */ |
| 229 |
return(0); /* don't echo */ |
| 230 |
if (formatval(fmt, s)) { /* check format */ |
| 231 |
if (globmatch(ourfmt, fmt)) { |
| 232 |
wrongformat = 0; |
| 233 |
strcpy(ourfmt, fmt); |
| 234 |
} else |
| 235 |
wrongformat = globmatch(PICFMT, fmt) ? 1 : -1; |
| 236 |
return(0); /* don't echo */ |
| 237 |
} |
| 238 |
if (isexpos(s)) { /* exposure */ |
| 239 |
d = exposval(s); |
| 240 |
scalecolor(input[nfiles].expos, d); |
| 241 |
} else if (iscolcor(s)) { /* color correction */ |
| 242 |
colcorval(ctmp, s); |
| 243 |
multcolor(input[nfiles].expos, ctmp); |
| 244 |
} else if (isaspect(s)) |
| 245 |
input[nfiles].pa *= aspectval(s); |
| 246 |
else if (isview(s) && sscanview(&input[nfiles].vw, s) > 0) |
| 247 |
gotview++; |
| 248 |
/* echo line */ |
| 249 |
putchar('\t'); |
| 250 |
return(fputs(s, stdout)); |
| 251 |
} |
| 252 |
|
| 253 |
|
| 254 |
checkfile() /* ready a file */ |
| 255 |
{ |
| 256 |
register int i; |
| 257 |
/* process header */ |
| 258 |
gotview = 0; |
| 259 |
fputs(input[nfiles].name, stdout); |
| 260 |
fputs(":\n", stdout); |
| 261 |
getheader(input[nfiles].fp, tabputs, NULL); |
| 262 |
if (wrongformat < 0) { |
| 263 |
eputs(input[nfiles].name); |
| 264 |
eputs(": not a Radiance picture\n"); |
| 265 |
quit(1); |
| 266 |
} |
| 267 |
if (wrongformat > 0) { |
| 268 |
wputs(input[nfiles].name); |
| 269 |
wputs(": warning -- incompatible picture format\n"); |
| 270 |
} |
| 271 |
if (!gotview || setview(&input[nfiles].vw) != NULL) |
| 272 |
input[nfiles].vw.type = 0; |
| 273 |
if (!fgetsresolu(&input[nfiles].rs, input[nfiles].fp)) { |
| 274 |
eputs(input[nfiles].name); |
| 275 |
eputs(": bad picture size\n"); |
| 276 |
quit(1); |
| 277 |
} |
| 278 |
if (xmax == 0 && ymax == 0) { |
| 279 |
xmax = scanlen(&input[nfiles].rs); |
| 280 |
ymax = numscans(&input[nfiles].rs); |
| 281 |
} else if (scanlen(&input[nfiles].rs) != xmax || |
| 282 |
numscans(&input[nfiles].rs) != ymax) { |
| 283 |
eputs(input[nfiles].name); |
| 284 |
eputs(": resolution mismatch\n"); |
| 285 |
quit(1); |
| 286 |
} |
| 287 |
/* allocate scanlines */ |
| 288 |
for (i = 0; i < WINSIZ; i++) |
| 289 |
input[nfiles].scan[i] = (COLOR *)emalloc(xmax*sizeof(COLOR)); |
| 290 |
} |
| 291 |
|
| 292 |
|
| 293 |
double |
| 294 |
rgb_bright(clr) |
| 295 |
COLOR clr; |
| 296 |
{ |
| 297 |
return(bright(clr)); |
| 298 |
} |
| 299 |
|
| 300 |
|
| 301 |
double |
| 302 |
xyz_bright(clr) |
| 303 |
COLOR clr; |
| 304 |
{ |
| 305 |
return(clr[CIEY]); |
| 306 |
} |
| 307 |
|
| 308 |
|
| 309 |
double (*ourbright)() = rgb_bright; |
| 310 |
|
| 311 |
|
| 312 |
init() /* perform final setup */ |
| 313 |
{ |
| 314 |
double l_colin(), l_expos(), l_pixaspect(), l_ray(), l_psize(); |
| 315 |
register int i; |
| 316 |
/* define constants */ |
| 317 |
varset("PI", ':', PI); |
| 318 |
varset(vnfiles, ':', (double)nfiles); |
| 319 |
varset(vxmax, ':', (double)xmax); |
| 320 |
varset(vymax, ':', (double)ymax); |
| 321 |
/* set functions */ |
| 322 |
for (i = 0; i < 3; i++) { |
| 323 |
funset(vcolexp[i], 1, ':', l_expos); |
| 324 |
funset(vcolin[i], 1, '=', l_colin); |
| 325 |
} |
| 326 |
funset(vbrtexp, 1, ':', l_expos); |
| 327 |
funset(vbrtin, 1, '=', l_colin); |
| 328 |
funset(vpixaspect, 1, ':', l_pixaspect); |
| 329 |
for (i = 0; i < 7; i++) |
| 330 |
funset(vray[i], 1, '=', l_ray); |
| 331 |
funset(vpsize, 1, '=', l_psize); |
| 332 |
/* set brightness function */ |
| 333 |
if (!strcmp(ourfmt, CIEFMT)) { |
| 334 |
varset(vwhteff, ':', 1.0); |
| 335 |
ourbright = xyz_bright; |
| 336 |
} else |
| 337 |
varset(vwhteff, ':', WHTEFFICACY); |
| 338 |
} |
| 339 |
|
| 340 |
|
| 341 |
combine() /* combine pictures */ |
| 342 |
{ |
| 343 |
EPNODE *coldef[3], *brtdef; |
| 344 |
COLOR *scanout; |
| 345 |
double d; |
| 346 |
register int i, j; |
| 347 |
/* check defined variables */ |
| 348 |
for (j = 0; j < 3; j++) { |
| 349 |
if (vardefined(vcolout[j])) |
| 350 |
coldef[j] = eparse(vcolout[j]); |
| 351 |
else |
| 352 |
coldef[j] = NULL; |
| 353 |
} |
| 354 |
if (vardefined(vbrtout)) |
| 355 |
brtdef = eparse(vbrtout); |
| 356 |
else |
| 357 |
brtdef = NULL; |
| 358 |
/* allocate scanline */ |
| 359 |
scanout = (COLOR *)emalloc(xres*sizeof(COLOR)); |
| 360 |
/* set input position */ |
| 361 |
yscan = ymax+MIDSCN; |
| 362 |
/* combine files */ |
| 363 |
for (ypos = yres-1; ypos >= 0; ypos--) { |
| 364 |
advance(); |
| 365 |
varset(vypos, '=', (double)ypos); |
| 366 |
for (xpos = 0; xpos < xres; xpos++) { |
| 367 |
xscan = (long)xpos*xmax/xres; |
| 368 |
varset(vxpos, '=', (double)xpos); |
| 369 |
eclock++; |
| 370 |
if (brtdef != NULL) { |
| 371 |
d = evalue(brtdef); |
| 372 |
if (d < 0.0) |
| 373 |
d = 0.0; |
| 374 |
setcolor(scanout[xpos], d, d, d); |
| 375 |
} else { |
| 376 |
for (j = 0; j < 3; j++) { |
| 377 |
if (coldef[j] != NULL) { |
| 378 |
d = evalue(coldef[j]); |
| 379 |
} else { |
| 380 |
d = 0.0; |
| 381 |
for (i = 0; i < nfiles; i++) |
| 382 |
d += colval(input[i].scan[MIDSCN][xscan],j); |
| 383 |
} |
| 384 |
if (d < 0.0) |
| 385 |
d = 0.0; |
| 386 |
colval(scanout[xpos],j) = d; |
| 387 |
} |
| 388 |
} |
| 389 |
} |
| 390 |
if (fwritescan(scanout, xres, stdout) < 0) { |
| 391 |
perror("write error"); |
| 392 |
quit(1); |
| 393 |
} |
| 394 |
} |
| 395 |
efree((char *)scanout); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
advance() /* read in data for next scanline */ |
| 400 |
{ |
| 401 |
int ytarget; |
| 402 |
register COLOR *st; |
| 403 |
register int i, j; |
| 404 |
|
| 405 |
for (ytarget = (long)ypos*ymax/yres; yscan > ytarget; yscan--) |
| 406 |
for (i = 0; i < nfiles; i++) { |
| 407 |
st = input[i].scan[WINSIZ-1]; |
| 408 |
for (j = WINSIZ-1; j > 0; j--) /* rotate window */ |
| 409 |
input[i].scan[j] = input[i].scan[j-1]; |
| 410 |
input[i].scan[0] = st; |
| 411 |
if (yscan <= MIDSCN) /* hit bottom? */ |
| 412 |
continue; |
| 413 |
if (freadscan(st, xmax, input[i].fp) < 0) { /* read */ |
| 414 |
eputs(input[i].name); |
| 415 |
eputs(": read error\n"); |
| 416 |
quit(1); |
| 417 |
} |
| 418 |
if (fabs(colval(input[i].coef,RED)-1.0) > 1e-3 || |
| 419 |
fabs(colval(input[i].coef,GRN)-1.0) > 1e-3 || |
| 420 |
fabs(colval(input[i].coef,BLU)-1.0) > 1e-3) |
| 421 |
for (j = 0; j < xmax; j++) /* adjust color */ |
| 422 |
multcolor(st[j], input[i].coef); |
| 423 |
} |
| 424 |
} |
| 425 |
|
| 426 |
|
| 427 |
double |
| 428 |
l_expos(nam) /* return picture exposure */ |
| 429 |
register char *nam; |
| 430 |
{ |
| 431 |
register int fn, n; |
| 432 |
|
| 433 |
fn = argument(1) - .5; |
| 434 |
if (fn < 0 || fn >= nfiles) |
| 435 |
return(1.0); |
| 436 |
if (nam == vbrtexp) |
| 437 |
return((*ourbright)(input[fn].expos)); |
| 438 |
n = 3; |
| 439 |
while (n--) |
| 440 |
if (nam == vcolexp[n]) |
| 441 |
return(colval(input[fn].expos,n)); |
| 442 |
eputs("Bad call to l_expos()!\n"); |
| 443 |
quit(1); |
| 444 |
} |
| 445 |
|
| 446 |
|
| 447 |
double |
| 448 |
l_pixaspect() /* return pixel aspect ratio */ |
| 449 |
{ |
| 450 |
register int fn; |
| 451 |
|
| 452 |
fn = argument(1) - .5; |
| 453 |
if (fn < 0 || fn >= nfiles) |
| 454 |
return(1.0); |
| 455 |
return(input[fn].pa); |
| 456 |
} |
| 457 |
|
| 458 |
|
| 459 |
double |
| 460 |
l_colin(nam) /* return color value for picture */ |
| 461 |
register char *nam; |
| 462 |
{ |
| 463 |
int fn; |
| 464 |
register int n, xoff, yoff; |
| 465 |
double d; |
| 466 |
|
| 467 |
fn = argument(1) - .5; |
| 468 |
if (fn < 0 || fn >= nfiles) { |
| 469 |
errno = EDOM; |
| 470 |
return(0.0); |
| 471 |
} |
| 472 |
xoff = yoff = 0; |
| 473 |
n = nargum(); |
| 474 |
if (n >= 2) { |
| 475 |
d = argument(2); |
| 476 |
if (d < 0.0) { |
| 477 |
xoff = d-.5; |
| 478 |
if (xscan+xoff < 0) |
| 479 |
xoff = -xscan; |
| 480 |
} else { |
| 481 |
xoff = d+.5; |
| 482 |
if (xscan+xoff >= xmax) |
| 483 |
xoff = xmax-1-xscan; |
| 484 |
} |
| 485 |
} |
| 486 |
if (n >= 3) { |
| 487 |
d = argument(3); |
| 488 |
if (d < 0.0) { |
| 489 |
yoff = d-.5; |
| 490 |
if (yoff+MIDSCN < 0) |
| 491 |
yoff = -MIDSCN; |
| 492 |
if (yscan+yoff < 0) |
| 493 |
yoff = -yscan; |
| 494 |
} else { |
| 495 |
yoff = d+.5; |
| 496 |
if (yoff+MIDSCN >= WINSIZ) |
| 497 |
yoff = WINSIZ-1-MIDSCN; |
| 498 |
if (yscan+yoff >= ymax) |
| 499 |
yoff = ymax-1-yscan; |
| 500 |
} |
| 501 |
} |
| 502 |
if (nam == vbrtin) |
| 503 |
return((*ourbright)(input[fn].scan[MIDSCN+yoff][xscan+xoff])); |
| 504 |
n = 3; |
| 505 |
while (n--) |
| 506 |
if (nam == vcolin[n]) |
| 507 |
return(colval(input[fn].scan[MIDSCN+yoff][xscan+xoff],n)); |
| 508 |
eputs("Bad call to l_colin()!\n"); |
| 509 |
quit(1); |
| 510 |
} |
| 511 |
|
| 512 |
|
| 513 |
double |
| 514 |
l_ray(nam) /* return ray origin or direction */ |
| 515 |
register char *nam; |
| 516 |
{ |
| 517 |
static unsigned long ltick[MAXINP]; |
| 518 |
static FVECT lorg[MAXINP], ldir[MAXINP]; |
| 519 |
static double ldist[MAXINP]; |
| 520 |
FLOAT loc[2]; |
| 521 |
int fn; |
| 522 |
register int i; |
| 523 |
|
| 524 |
fn = argument(1) - .5; |
| 525 |
if (fn < 0 || fn >= nfiles) { |
| 526 |
errno = EDOM; |
| 527 |
return(0.0); |
| 528 |
} |
| 529 |
if (ltick[fn] != eclock) { /* need to compute? */ |
| 530 |
lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0; |
| 531 |
ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0; |
| 532 |
ldist[fn] = -1.0; |
| 533 |
if (input[fn].vw.type == 0) |
| 534 |
errno = EDOM; |
| 535 |
else { |
| 536 |
pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan); |
| 537 |
ldist[fn] = viewray(lorg[fn], ldir[fn], |
| 538 |
&input[fn].vw, loc[0], loc[1]); |
| 539 |
} |
| 540 |
ltick[fn] = eclock; |
| 541 |
} |
| 542 |
if (nam == vray[i=6]) |
| 543 |
return(ldist[fn]); |
| 544 |
while (i--) |
| 545 |
if (nam == vray[i]) |
| 546 |
return(i < 3 ? lorg[fn][i] : ldir[fn][i-3]); |
| 547 |
eputs("Bad call to l_ray()!\n"); |
| 548 |
quit(1); |
| 549 |
} |
| 550 |
|
| 551 |
|
| 552 |
double |
| 553 |
l_psize() /* compute pixel size in steradians */ |
| 554 |
{ |
| 555 |
static unsigned long ltick[MAXINP]; |
| 556 |
static double psize[MAXINP]; |
| 557 |
FVECT dir0, org, dirx, diry; |
| 558 |
FLOAT locx[2], locy[2]; |
| 559 |
double d; |
| 560 |
int fn; |
| 561 |
register int i; |
| 562 |
|
| 563 |
d = argument(1); |
| 564 |
if (d < .5 || d >= nfiles+.5) { |
| 565 |
errno = EDOM; |
| 566 |
return(0.0); |
| 567 |
} |
| 568 |
fn = d - .5; |
| 569 |
if (ltick[fn] != eclock) { /* need to compute? */ |
| 570 |
psize[fn] = 0.0; |
| 571 |
if (input[fn].vw.type == 0) |
| 572 |
errno = EDOM; |
| 573 |
else if (input[fn].vw.type != VT_PAR && |
| 574 |
funvalue(vray[6], 1, &d) >= 0) { |
| 575 |
for (i = 0; i < 3; i++) |
| 576 |
dir0[i] = funvalue(vray[3+i], 1, &d); |
| 577 |
pix2loc(locx, &input[fn].rs, xscan+1, ymax-1-yscan); |
| 578 |
pix2loc(locy, &input[fn].rs, xscan, ymax-yscan); |
| 579 |
if (viewray(org, dirx, &input[fn].vw, |
| 580 |
locx[0], locx[1]) >= 0 && |
| 581 |
viewray(org, diry, &input[fn].vw, |
| 582 |
locy[0], locy[1]) >= 0) { |
| 583 |
/* approximate solid angle */ |
| 584 |
for (i = 0; i < 3; i++) { |
| 585 |
dirx[i] -= dir0[i]; |
| 586 |
diry[i] -= dir0[i]; |
| 587 |
} |
| 588 |
fcross(dir0, dirx, diry); |
| 589 |
psize[fn] = sqrt(DOT(dir0,dir0)); |
| 590 |
} |
| 591 |
} |
| 592 |
ltick[fn] = eclock; |
| 593 |
} |
| 594 |
return(psize[fn]); |
| 595 |
} |
| 596 |
|
| 597 |
|
| 598 |
void |
| 599 |
wputs(msg) |
| 600 |
char *msg; |
| 601 |
{ |
| 602 |
if (!nowarn) |
| 603 |
eputs(msg); |
| 604 |
} |
| 605 |
|
| 606 |
|
| 607 |
void |
| 608 |
eputs(msg) |
| 609 |
char *msg; |
| 610 |
{ |
| 611 |
fputs(msg, stderr); |
| 612 |
} |
| 613 |
|
| 614 |
|
| 615 |
void |
| 616 |
quit(code) /* exit gracefully */ |
| 617 |
int code; |
| 618 |
{ |
| 619 |
register int i; |
| 620 |
/* close input files */ |
| 621 |
for (i = 0; i < nfiles; i++) |
| 622 |
if (input[i].name == Command) |
| 623 |
pclose(input[i].fp); |
| 624 |
else |
| 625 |
fclose(input[i].fp); |
| 626 |
exit(code); |
| 627 |
} |
