| 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 */ |
| 252 |
|
|
| 253 |
|
fillpicture() /* fill in empty spaces */ |
| 254 |
|
{ |
| 255 |
+ |
int *yback, xback; |
| 256 |
|
int y; |
| 257 |
< |
COLR cfill; |
| 258 |
< |
register int x, xblank; |
| 259 |
< |
|
| 257 |
> |
COLR pfill; |
| 258 |
> |
register int x, i; |
| 259 |
> |
/* get back buffer */ |
| 260 |
> |
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 261 |
> |
if (yback == NULL) { |
| 262 |
> |
perror(progname); |
| 263 |
> |
return; |
| 264 |
> |
} |
| 265 |
> |
for (x = 0; x < ourview.hresolu; x++) |
| 266 |
> |
yback[x] = -2; |
| 267 |
> |
/* fill image */ |
| 268 |
|
for (y = 0; y < ourview.vresolu; y++) { |
| 269 |
< |
xblank = -1; |
| 269 |
> |
xback = -2; |
| 270 |
|
for (x = 0; x < ourview.hresolu; x++) |
| 271 |
< |
if (zscan(y)[x] <= 0.0) { |
| 272 |
< |
if (xblank < 0) |
| 273 |
< |
xblank = x; |
| 274 |
< |
} else if (xblank >= 0) { |
| 275 |
< |
if (xblank == 0 || zscan(y)[xblank-1] < zscan(y)[x]) |
| 276 |
< |
copycolr(cfill, pscan(y)[x]); |
| 271 |
> |
if (zscan(y)[x] <= 0.0) { /* empty pixel */ |
| 272 |
> |
if (yback[x] == -2) { |
| 273 |
> |
for (i = y+1; i < ourview.vresolu; i++) |
| 274 |
> |
if (zscan(i)[x] > 0.0) |
| 275 |
> |
break; |
| 276 |
> |
if (i < ourview.vresolu |
| 277 |
> |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 278 |
> |
yback[x] = i; |
| 279 |
> |
else |
| 280 |
> |
yback[x] = y-1; |
| 281 |
> |
} |
| 282 |
> |
if (xback == -2) { |
| 283 |
> |
for (i = x+1; x < ourview.hresolu; i++) |
| 284 |
> |
if (zscan(y)[i] > 0.0) |
| 285 |
> |
break; |
| 286 |
> |
if (i < ourview.hresolu |
| 287 |
> |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 288 |
> |
xback = i; |
| 289 |
> |
else |
| 290 |
> |
xback = x-1; |
| 291 |
> |
} |
| 292 |
> |
if (xback < 0 && yback[x] < 0) |
| 293 |
> |
continue; |
| 294 |
> |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 295 |
> |
|| ( ABS(y-yback[x]) > 1 |
| 296 |
> |
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
| 297 |
> |
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 298 |
|
else |
| 299 |
< |
copycolr(cfill, pscan(y)[xblank-1]); |
| 300 |
< |
for ( ; xblank < x; xblank++) |
| 301 |
< |
copycolr(pscan(y)[xblank], cfill); |
| 302 |
< |
xblank = -1; |
| 299 |
> |
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 300 |
> |
} else { /* full pixel */ |
| 301 |
> |
yback[x] = -2; |
| 302 |
> |
xback = -2; |
| 303 |
|
} |
| 272 |
– |
if (xblank > 0) { |
| 273 |
– |
copycolr(cfill, pscan(y)[xblank-1]); |
| 274 |
– |
for ( ; xblank < ourview.hresolu; xblank++) |
| 275 |
– |
copycolr(pscan(y)[xblank], cfill); |
| 276 |
– |
} |
| 304 |
|
} |
| 305 |
+ |
free((char *)yback); |
| 306 |
|
} |
| 307 |
|
|
| 308 |
|
|
