| 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 */ |
| 24 |
> |
double zeps = .02; /* allowed z epsilon */ |
| 25 |
|
|
| 26 |
|
COLR *ourpict; /* output picture */ |
| 27 |
|
float *ourzbuf; /* corresponding z-buffer */ |
| 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 */ |
| 173 |
|
char *pfile, *zfile; |
| 174 |
|
{ |
| 175 |
|
FILE *pfp, *zfp; |
| 164 |
– |
COLR *scanin; |
| 165 |
– |
float *zin; |
| 176 |
|
char *err; |
| 177 |
< |
int xres, yres; |
| 177 |
> |
COLR *scanin; |
| 178 |
> |
float *zin, *zlast; |
| 179 |
> |
int *plast; |
| 180 |
|
int y; |
| 181 |
|
/* open input files */ |
| 182 |
|
if ((pfp = fopen(pfile, "r")) == NULL) { |
| 191 |
|
printf("%s:\n", pfile); |
| 192 |
|
gotview = 0; |
| 193 |
|
getheader(pfp, headline); |
| 194 |
< |
if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) { |
| 194 |
> |
if (!gotview || fgetresolu(&theirview.hresolu, &theirview.vresolu, pfp) |
| 195 |
> |
!= (YMAJOR|YDECR)) { |
| 196 |
|
fprintf(stderr, "%s: picture view error\n", pfile); |
| 197 |
|
exit(1); |
| 198 |
|
} |
| 186 |
– |
theirview.hresolu = xres; |
| 187 |
– |
theirview.vresolu = yres; |
| 199 |
|
if (err = setview(&theirview)) { |
| 200 |
|
fprintf(stderr, "%s: %s\n", pfile, err); |
| 201 |
|
exit(1); |
| 202 |
|
} |
| 203 |
+ |
/* compute transformation */ |
| 204 |
+ |
pixform(theirs2ours, &theirview, &ourview); |
| 205 |
|
/* allocate scanlines */ |
| 206 |
< |
scanin = (COLR *)malloc(xres*sizeof(COLR)); |
| 207 |
< |
zin = (float *)malloc(xres*sizeof(float)); |
| 208 |
< |
if (scanin == NULL || zin == NULL) { |
| 206 |
> |
scanin = (COLR *)malloc(theirview.hresolu*sizeof(COLR)); |
| 207 |
> |
zin = (float *)malloc(theirview.hresolu*sizeof(float)); |
| 208 |
> |
zlast = (float *)calloc(theirview.hresolu, sizeof(float)); |
| 209 |
> |
plast = (int *)calloc(theirview.hresolu, sizeof(int)); |
| 210 |
> |
if (scanin == NULL || zin == NULL || zlast == NULL || plast == NULL) { |
| 211 |
|
perror(progname); |
| 212 |
|
exit(1); |
| 213 |
|
} |
| 214 |
|
/* load image */ |
| 215 |
< |
for (y = yres-1; y >= 0; y--) { |
| 216 |
< |
if (freadcolrs(scanin, xres, pfp) < 0) { |
| 215 |
> |
for (y = theirview.vresolu-1; y >= 0; y--) { |
| 216 |
> |
if (freadcolrs(scanin, theirview.hresolu, pfp) < 0) { |
| 217 |
|
fprintf(stderr, "%s: read error\n", pfile); |
| 218 |
|
exit(1); |
| 219 |
|
} |
| 220 |
< |
if (fread(zin, sizeof(float), xres, zfp) < xres) { |
| 220 |
> |
if (fread(zin, sizeof(float), theirview.hresolu, zfp) |
| 221 |
> |
< theirview.hresolu) { |
| 222 |
|
fprintf(stderr, "%s: read error\n", zfile); |
| 223 |
|
exit(1); |
| 224 |
|
} |
| 225 |
< |
addscanline(y, scanin, zin); |
| 225 |
> |
addscanline(y, scanin, zin, plast, zlast); |
| 226 |
|
} |
| 227 |
|
/* clean up */ |
| 228 |
|
free((char *)scanin); |
| 229 |
|
free((char *)zin); |
| 230 |
+ |
free((char *)plast); |
| 231 |
+ |
free((char *)zlast); |
| 232 |
|
fclose(pfp); |
| 233 |
|
fclose(zfp); |
| 234 |
|
} |
| 235 |
|
|
| 236 |
|
|
| 237 |
< |
addscanline(y, pline, zline) /* add scanline to output */ |
| 237 |
> |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
| 238 |
> |
register double xfmat[4][4]; |
| 239 |
> |
register VIEW *vw1, *vw2; |
| 240 |
> |
{ |
| 241 |
> |
double m4t[4][4]; |
| 242 |
> |
|
| 243 |
> |
setident4(xfmat); |
| 244 |
> |
xfmat[0][0] = vw1->vhinc[0]; |
| 245 |
> |
xfmat[0][1] = vw1->vhinc[1]; |
| 246 |
> |
xfmat[0][2] = vw1->vhinc[2]; |
| 247 |
> |
xfmat[1][0] = vw1->vvinc[0]; |
| 248 |
> |
xfmat[1][1] = vw1->vvinc[1]; |
| 249 |
> |
xfmat[1][2] = vw1->vvinc[2]; |
| 250 |
> |
xfmat[2][0] = vw1->vdir[0]; |
| 251 |
> |
xfmat[2][1] = vw1->vdir[1]; |
| 252 |
> |
xfmat[2][2] = vw1->vdir[2]; |
| 253 |
> |
xfmat[3][0] = vw1->vp[0]; |
| 254 |
> |
xfmat[3][1] = vw1->vp[1]; |
| 255 |
> |
xfmat[3][2] = vw1->vp[2]; |
| 256 |
> |
setident4(m4t); |
| 257 |
> |
m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
| 258 |
> |
m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
| 259 |
> |
m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
| 260 |
> |
m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
| 261 |
> |
m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
| 262 |
> |
m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
| 263 |
> |
m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
| 264 |
> |
m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
| 265 |
> |
m4t[0][2] = vw2->vdir[0]; |
| 266 |
> |
m4t[1][2] = vw2->vdir[1]; |
| 267 |
> |
m4t[2][2] = vw2->vdir[2]; |
| 268 |
> |
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 269 |
> |
multmat4(xfmat, xfmat, m4t); |
| 270 |
> |
} |
| 271 |
> |
|
| 272 |
> |
|
| 273 |
> |
addscanline(y, pline, zline, lasty, lastyz) /* add scanline to output */ |
| 274 |
|
int y; |
| 275 |
|
COLR *pline; |
| 276 |
|
float *zline; |
| 277 |
+ |
int *lasty; /* input/output */ |
| 278 |
+ |
float *lastyz; /* input/output */ |
| 279 |
|
{ |
| 280 |
< |
FVECT p, dir; |
| 281 |
< |
double xnew, ynew, znew; |
| 280 |
> |
extern double sqrt(), fabs(); |
| 281 |
> |
double pos[3]; |
| 282 |
> |
int lastx = 0; |
| 283 |
> |
double lastxz = 0; |
| 284 |
> |
double zt; |
| 285 |
> |
int xpos, ypos; |
| 286 |
|
register int x; |
| 227 |
– |
register int xpos, ypos; |
| 287 |
|
|
| 288 |
< |
for (x = 0; x < theirview.hresolu; x++) { |
| 289 |
< |
rayview(p, dir, &theirview, x+.5, y+.5); |
| 290 |
< |
p[0] += zline[x]*dir[0]; |
| 291 |
< |
p[1] += zline[x]*dir[1]; |
| 292 |
< |
p[2] += zline[x]*dir[2]; |
| 293 |
< |
pixelview(&xnew, &ynew, &znew, &ourview, p); |
| 294 |
< |
if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu |
| 295 |
< |
|| ynew < 0 || ynew > ourview.vresolu) |
| 288 |
> |
for (x = theirview.hresolu-1; x >= 0; x--) { |
| 289 |
> |
pos[0] = x - .5*(theirview.hresolu-1); |
| 290 |
> |
pos[1] = y - .5*(theirview.vresolu-1); |
| 291 |
> |
pos[2] = zline[x]; |
| 292 |
> |
if (theirview.type == VT_PER) { |
| 293 |
> |
/* |
| 294 |
> |
* The following (single) statement can go |
| 295 |
> |
* if z is along the view direction rather |
| 296 |
> |
* than an eye ray. |
| 297 |
> |
*/ |
| 298 |
> |
pos[2] /= sqrt( 1. |
| 299 |
> |
+ pos[0]*pos[0]*theirview.vhn2 |
| 300 |
> |
+ pos[1]*pos[1]*theirview.vvn2 ); |
| 301 |
> |
pos[0] *= pos[2]; |
| 302 |
> |
pos[1] *= pos[2]; |
| 303 |
> |
} |
| 304 |
> |
multp3(pos, pos, theirs2ours); |
| 305 |
> |
if (pos[2] <= 0) |
| 306 |
|
continue; |
| 307 |
< |
/* check current value at position */ |
| 308 |
< |
xpos = xnew; |
| 309 |
< |
ypos = ynew; |
| 241 |
< |
if (zscan(ypos)[xpos] <= 0.0 |
| 242 |
< |
|| zscan(ypos)[xpos] - znew |
| 243 |
< |
> zeps*zscan(ypos)[xpos]) { |
| 244 |
< |
zscan(ypos)[xpos] = znew; |
| 245 |
< |
copycolr(pscan(ypos)[xpos], pline[x]); |
| 307 |
> |
if (ourview.type == VT_PER) { |
| 308 |
> |
pos[0] /= pos[2]; |
| 309 |
> |
pos[1] /= pos[2]; |
| 310 |
|
} |
| 311 |
+ |
pos[0] += .5*ourview.hresolu; |
| 312 |
+ |
pos[1] += .5*ourview.vresolu; |
| 313 |
+ |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
| 314 |
+ |
|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
| 315 |
+ |
continue; |
| 316 |
+ |
/* add pixel to our image */ |
| 317 |
+ |
zt = 2.*zeps*zline[x]; |
| 318 |
+ |
addpixel(xpos, ypos, |
| 319 |
+ |
(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1, |
| 320 |
+ |
(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1, |
| 321 |
+ |
pline[x], pos[2]); |
| 322 |
+ |
lastx = xpos; |
| 323 |
+ |
lasty[x] = ypos; |
| 324 |
+ |
lastxz = lastyz[x] = zline[x]; |
| 325 |
|
} |
| 326 |
|
} |
| 327 |
|
|
| 328 |
|
|
| 329 |
+ |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
| 330 |
+ |
int xstart, ystart; |
| 331 |
+ |
int width, height; |
| 332 |
+ |
COLR pix; |
| 333 |
+ |
double z; |
| 334 |
+ |
{ |
| 335 |
+ |
register int x, y; |
| 336 |
+ |
/* make width and height positive */ |
| 337 |
+ |
if (width < 0) { |
| 338 |
+ |
width = -width; |
| 339 |
+ |
xstart = xstart-width+1; |
| 340 |
+ |
} else if (width == 0) |
| 341 |
+ |
width = 1; |
| 342 |
+ |
if (height < 0) { |
| 343 |
+ |
height = -height; |
| 344 |
+ |
ystart = ystart-height+1; |
| 345 |
+ |
} else if (height == 0) |
| 346 |
+ |
height = 1; |
| 347 |
+ |
/* fill pixel(s) within rectangle */ |
| 348 |
+ |
for (y = ystart; y < ystart+height; y++) |
| 349 |
+ |
for (x = xstart; x < xstart+width; x++) |
| 350 |
+ |
if (zscan(y)[x] <= 0 |
| 351 |
+ |
|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
| 352 |
+ |
zscan(y)[x] = z; |
| 353 |
+ |
copycolr(pscan(y)[x], pix); |
| 354 |
+ |
} |
| 355 |
+ |
} |
| 356 |
+ |
|
| 357 |
+ |
|
| 358 |
|
fillpicture() /* fill in empty spaces */ |
| 359 |
|
{ |
| 360 |
+ |
int *yback, xback; |
| 361 |
|
int y; |
| 362 |
< |
COLR cfill; |
| 363 |
< |
register int x, xblank; |
| 364 |
< |
|
| 362 |
> |
COLR pfill; |
| 363 |
> |
register int x, i; |
| 364 |
> |
/* get back buffer */ |
| 365 |
> |
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 366 |
> |
if (yback == NULL) { |
| 367 |
> |
perror(progname); |
| 368 |
> |
return; |
| 369 |
> |
} |
| 370 |
> |
for (x = 0; x < ourview.hresolu; x++) |
| 371 |
> |
yback[x] = -2; |
| 372 |
> |
/* |
| 373 |
> |
* Xback and yback are the pixel locations of suitable |
| 374 |
> |
* background values in each direction. |
| 375 |
> |
* A value of -2 means unassigned, and -1 means |
| 376 |
> |
* that there is no suitable background in this direction. |
| 377 |
> |
*/ |
| 378 |
> |
/* fill image */ |
| 379 |
|
for (y = 0; y < ourview.vresolu; y++) { |
| 380 |
< |
xblank = -1; |
| 380 |
> |
xback = -2; |
| 381 |
|
for (x = 0; x < ourview.hresolu; x++) |
| 382 |
< |
if (zscan(y)[x] <= 0.0) { |
| 383 |
< |
if (xblank < 0) |
| 384 |
< |
xblank = x; |
| 385 |
< |
} else if (xblank >= 0) { |
| 386 |
< |
if (xblank == 0 || zscan(y)[xblank-1] < zscan(y)[x]) |
| 387 |
< |
copycolr(cfill, pscan(y)[x]); |
| 382 |
> |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 383 |
> |
/* |
| 384 |
> |
* First, find background from above or below. |
| 385 |
> |
* (farthest assigned pixel) |
| 386 |
> |
*/ |
| 387 |
> |
if (yback[x] == -2) { |
| 388 |
> |
for (i = y+1; i < ourview.vresolu; i++) |
| 389 |
> |
if (zscan(i)[x] > 0) |
| 390 |
> |
break; |
| 391 |
> |
if (i < ourview.vresolu |
| 392 |
> |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 393 |
> |
yback[x] = i; |
| 394 |
> |
else |
| 395 |
> |
yback[x] = y-1; |
| 396 |
> |
} |
| 397 |
> |
/* |
| 398 |
> |
* Next, find background from left or right. |
| 399 |
> |
*/ |
| 400 |
> |
if (xback == -2) { |
| 401 |
> |
for (i = x+1; x < ourview.hresolu; i++) |
| 402 |
> |
if (zscan(y)[i] > 0) |
| 403 |
> |
break; |
| 404 |
> |
if (i < ourview.hresolu |
| 405 |
> |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 406 |
> |
xback = i; |
| 407 |
> |
else |
| 408 |
> |
xback = x-1; |
| 409 |
> |
} |
| 410 |
> |
if (xback < 0 && yback[x] < 0) |
| 411 |
> |
continue; /* no background */ |
| 412 |
> |
/* |
| 413 |
> |
* Compare, and use the background that is |
| 414 |
> |
* farther, unless one of them is next to us. |
| 415 |
> |
*/ |
| 416 |
> |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 417 |
> |
|| ( ABS(y-yback[x]) > 1 |
| 418 |
> |
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
| 419 |
> |
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 420 |
|
else |
| 421 |
< |
copycolr(cfill, pscan(y)[xblank-1]); |
| 422 |
< |
for ( ; xblank < x; xblank++) |
| 423 |
< |
copycolr(pscan(y)[xblank], cfill); |
| 424 |
< |
xblank = -1; |
| 421 |
> |
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 422 |
> |
} else { /* full pixel */ |
| 423 |
> |
yback[x] = -2; |
| 424 |
> |
xback = -2; |
| 425 |
|
} |
| 272 |
– |
if (xblank > 0) { |
| 273 |
– |
copycolr(cfill, pscan(y)[xblank-1]); |
| 274 |
– |
for ( ; xblank < ourview.hresolu; xblank++) |
| 275 |
– |
copycolr(pscan(y)[xblank], cfill); |
| 276 |
– |
} |
| 426 |
|
} |
| 427 |
+ |
free((char *)yback); |
| 428 |
|
} |
| 429 |
|
|
| 430 |
|
|
