| 17 |
|
#define pscan(y) (ourpict+(y)*ourview.hresolu) |
| 18 |
|
#define zscan(y) (ourzbuf+(y)*ourview.hresolu) |
| 19 |
|
|
| 20 |
+ |
#define ABS(x) ((x)>0?(x):-(x)) |
| 21 |
+ |
|
| 22 |
|
VIEW ourview = STDVIEW(512); /* desired view */ |
| 23 |
|
|
| 24 |
|
double zeps = 0.001; /* allowed z epsilon */ |
| 31 |
|
VIEW theirview = STDVIEW(512); /* input view */ |
| 32 |
|
int gotview; /* got input view? */ |
| 33 |
|
|
| 34 |
+ |
double theirs2ours[4][4]; /* transformation matrix */ |
| 35 |
|
|
| 36 |
+ |
|
| 37 |
|
main(argc, argv) /* interpolate pictures */ |
| 38 |
|
int argc; |
| 39 |
|
char *argv[]; |
| 51 |
|
check(2,1); |
| 52 |
|
zeps = atof(argv[++i]); |
| 53 |
|
break; |
| 54 |
+ |
case 'x': /* x resolution */ |
| 55 |
+ |
check(2,1); |
| 56 |
+ |
ourview.hresolu = atoi(argv[++i]); |
| 57 |
+ |
break; |
| 58 |
+ |
case 'y': /* y resolution */ |
| 59 |
+ |
check(2,1); |
| 60 |
+ |
ourview.vresolu = atoi(argv[++i]); |
| 61 |
+ |
break; |
| 62 |
|
case 'v': /* view */ |
| 63 |
|
switch (argv[i][2]) { |
| 64 |
|
case 't': /* type */ |
| 201 |
|
fprintf(stderr, "%s: %s\n", pfile, err); |
| 202 |
|
exit(1); |
| 203 |
|
} |
| 204 |
+ |
/* compute transformation */ |
| 205 |
+ |
pixform(theirs2ours, &theirview, &ourview); |
| 206 |
|
/* allocate scanlines */ |
| 207 |
|
scanin = (COLR *)malloc(xres*sizeof(COLR)); |
| 208 |
|
zin = (float *)malloc(xres*sizeof(float)); |
| 230 |
|
} |
| 231 |
|
|
| 232 |
|
|
| 233 |
+ |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
| 234 |
+ |
register double xfmat[4][4]; |
| 235 |
+ |
register VIEW *vw1, *vw2; |
| 236 |
+ |
{ |
| 237 |
+ |
double m4t[4][4]; |
| 238 |
+ |
|
| 239 |
+ |
setident4(xfmat); |
| 240 |
+ |
xfmat[0][0] = vw1->vhinc[0]; |
| 241 |
+ |
xfmat[0][1] = vw1->vhinc[1]; |
| 242 |
+ |
xfmat[0][2] = vw1->vhinc[2]; |
| 243 |
+ |
xfmat[1][0] = vw1->vvinc[0]; |
| 244 |
+ |
xfmat[1][1] = vw1->vvinc[1]; |
| 245 |
+ |
xfmat[1][2] = vw1->vvinc[2]; |
| 246 |
+ |
xfmat[2][0] = vw1->vdir[0]; |
| 247 |
+ |
xfmat[2][1] = vw1->vdir[1]; |
| 248 |
+ |
xfmat[2][2] = vw1->vdir[2]; |
| 249 |
+ |
xfmat[3][0] = vw1->vp[0]; |
| 250 |
+ |
xfmat[3][1] = vw1->vp[1]; |
| 251 |
+ |
xfmat[3][2] = vw1->vp[2]; |
| 252 |
+ |
setident4(m4t); |
| 253 |
+ |
m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
| 254 |
+ |
m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
| 255 |
+ |
m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
| 256 |
+ |
m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
| 257 |
+ |
m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
| 258 |
+ |
m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
| 259 |
+ |
m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
| 260 |
+ |
m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
| 261 |
+ |
m4t[0][2] = vw2->vdir[0]; |
| 262 |
+ |
m4t[1][2] = vw2->vdir[1]; |
| 263 |
+ |
m4t[2][2] = vw2->vdir[2]; |
| 264 |
+ |
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 265 |
+ |
multmat4(xfmat, xfmat, m4t); |
| 266 |
+ |
} |
| 267 |
+ |
|
| 268 |
+ |
|
| 269 |
|
addscanline(y, pline, zline) /* add scanline to output */ |
| 270 |
|
int y; |
| 271 |
|
COLR *pline; |
| 272 |
|
float *zline; |
| 273 |
|
{ |
| 274 |
< |
FVECT p, dir; |
| 275 |
< |
double xnew, ynew, znew; |
| 274 |
> |
extern double sqrt(); |
| 275 |
> |
double pos[3]; |
| 276 |
|
register int x; |
| 277 |
|
register int xpos, ypos; |
| 278 |
|
|
| 279 |
|
for (x = 0; x < theirview.hresolu; x++) { |
| 280 |
< |
rayview(p, dir, &theirview, x+.5, y+.5); |
| 281 |
< |
p[0] += zline[x]*dir[0]; |
| 282 |
< |
p[1] += zline[x]*dir[1]; |
| 283 |
< |
p[2] += zline[x]*dir[2]; |
| 284 |
< |
pixelview(&xnew, &ynew, &znew, &ourview, p); |
| 285 |
< |
if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu |
| 286 |
< |
|| ynew < 0 || ynew > ourview.vresolu) |
| 280 |
> |
pos[0] = x - .5*(theirview.hresolu-1); |
| 281 |
> |
pos[1] = y - .5*(theirview.vresolu-1); |
| 282 |
> |
pos[2] = zline[x]; |
| 283 |
> |
if (theirview.type == VT_PER) { |
| 284 |
> |
pos[2] /= sqrt( 1. |
| 285 |
> |
+ pos[0]*pos[0]*theirview.vhn2 |
| 286 |
> |
+ pos[1]*pos[1]*theirview.vvn2 ); |
| 287 |
> |
pos[0] *= pos[2]; |
| 288 |
> |
pos[1] *= pos[2]; |
| 289 |
> |
} |
| 290 |
> |
multp3(pos, pos, theirs2ours); |
| 291 |
> |
if (pos[2] <= 0.0) |
| 292 |
|
continue; |
| 293 |
< |
/* check current value at position */ |
| 294 |
< |
xpos = xnew; |
| 295 |
< |
ypos = ynew; |
| 293 |
> |
if (ourview.type == VT_PER) { |
| 294 |
> |
pos[0] /= pos[2]; |
| 295 |
> |
pos[1] /= pos[2]; |
| 296 |
> |
} |
| 297 |
> |
pos[0] += .5*ourview.hresolu; |
| 298 |
> |
pos[1] += .5*ourview.vresolu; |
| 299 |
> |
if (pos[0] < 0 || pos[0] >= ourview.hresolu |
| 300 |
> |
|| pos[1] < 0 || pos[1] >= ourview.vresolu) |
| 301 |
> |
continue; |
| 302 |
> |
/* check current value at pos */ |
| 303 |
> |
xpos = pos[0]; |
| 304 |
> |
ypos = pos[1]; |
| 305 |
|
if (zscan(ypos)[xpos] <= 0.0 |
| 306 |
< |
|| zscan(ypos)[xpos] - znew |
| 306 |
> |
|| zscan(ypos)[xpos] - pos[2] |
| 307 |
|
> zeps*zscan(ypos)[xpos]) { |
| 308 |
< |
zscan(ypos)[xpos] = znew; |
| 308 |
> |
zscan(ypos)[xpos] = pos[2]; |
| 309 |
|
copycolr(pscan(ypos)[xpos], pline[x]); |
| 310 |
|
} |
| 311 |
|
} |
| 314 |
|
|
| 315 |
|
fillpicture() /* fill in empty spaces */ |
| 316 |
|
{ |
| 317 |
+ |
int *yback, xback; |
| 318 |
|
int y; |
| 319 |
< |
COLR cfill; |
| 320 |
< |
register int x, xblank; |
| 321 |
< |
|
| 319 |
> |
COLR pfill; |
| 320 |
> |
register int x, i; |
| 321 |
> |
/* get back buffer */ |
| 322 |
> |
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 323 |
> |
if (yback == NULL) { |
| 324 |
> |
perror(progname); |
| 325 |
> |
return; |
| 326 |
> |
} |
| 327 |
> |
for (x = 0; x < ourview.hresolu; x++) |
| 328 |
> |
yback[x] = -2; |
| 329 |
> |
/* |
| 330 |
> |
* Xback and yback are the pixel locations of suitable |
| 331 |
> |
* background values in each direction. |
| 332 |
> |
* A value of -2 means unassigned, and -1 means |
| 333 |
> |
* that there is no suitable background in this direction. |
| 334 |
> |
*/ |
| 335 |
> |
/* fill image */ |
| 336 |
|
for (y = 0; y < ourview.vresolu; y++) { |
| 337 |
< |
xblank = -1; |
| 337 |
> |
xback = -2; |
| 338 |
|
for (x = 0; x < ourview.hresolu; x++) |
| 339 |
< |
if (zscan(y)[x] <= 0.0) { |
| 340 |
< |
if (xblank < 0) |
| 341 |
< |
xblank = x; |
| 342 |
< |
} else if (xblank >= 0) { |
| 343 |
< |
if (xblank == 0 || zscan(y)[xblank-1] < zscan(y)[x]) |
| 344 |
< |
copycolr(cfill, pscan(y)[x]); |
| 339 |
> |
if (zscan(y)[x] <= 0.0) { /* empty pixel */ |
| 340 |
> |
/* |
| 341 |
> |
* First, find background from above or below. |
| 342 |
> |
* (farthest assigned pixel) |
| 343 |
> |
*/ |
| 344 |
> |
if (yback[x] == -2) { |
| 345 |
> |
for (i = y+1; i < ourview.vresolu; i++) |
| 346 |
> |
if (zscan(i)[x] > 0.0) |
| 347 |
> |
break; |
| 348 |
> |
if (i < ourview.vresolu |
| 349 |
> |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 350 |
> |
yback[x] = i; |
| 351 |
> |
else |
| 352 |
> |
yback[x] = y-1; |
| 353 |
> |
} |
| 354 |
> |
/* |
| 355 |
> |
* Next, find background from left or right. |
| 356 |
> |
*/ |
| 357 |
> |
if (xback == -2) { |
| 358 |
> |
for (i = x+1; x < ourview.hresolu; i++) |
| 359 |
> |
if (zscan(y)[i] > 0.0) |
| 360 |
> |
break; |
| 361 |
> |
if (i < ourview.hresolu |
| 362 |
> |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 363 |
> |
xback = i; |
| 364 |
> |
else |
| 365 |
> |
xback = x-1; |
| 366 |
> |
} |
| 367 |
> |
if (xback < 0 && yback[x] < 0) |
| 368 |
> |
continue; /* no background */ |
| 369 |
> |
/* |
| 370 |
> |
* Compare, and use the background that is |
| 371 |
> |
* farther, unless one of them is next to us. |
| 372 |
> |
*/ |
| 373 |
> |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 374 |
> |
|| ( ABS(y-yback[x]) > 1 |
| 375 |
> |
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
| 376 |
> |
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 377 |
|
else |
| 378 |
< |
copycolr(cfill, pscan(y)[xblank-1]); |
| 379 |
< |
for ( ; xblank < x; xblank++) |
| 380 |
< |
copycolr(pscan(y)[xblank], cfill); |
| 381 |
< |
xblank = -1; |
| 378 |
> |
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 379 |
> |
} else { /* full pixel */ |
| 380 |
> |
yback[x] = -2; |
| 381 |
> |
xback = -2; |
| 382 |
|
} |
| 272 |
– |
if (xblank > 0) { |
| 273 |
– |
copycolr(cfill, pscan(y)[xblank-1]); |
| 274 |
– |
for ( ; xblank < ourview.hresolu; xblank++) |
| 275 |
– |
copycolr(pscan(y)[xblank], cfill); |
| 276 |
– |
} |
| 383 |
|
} |
| 384 |
+ |
free((char *)yback); |
| 385 |
|
} |
| 386 |
|
|
| 387 |
|
|
