237 |
|
int p; |
238 |
|
register int box[3][2]; |
239 |
|
{ |
240 |
< |
long sum[3]; |
241 |
< |
int r, g, n; |
242 |
< |
register int b, c; |
240 |
> |
unsigned long sum[3]; |
241 |
> |
unsigned r, g, n; |
242 |
> |
register unsigned b, c; |
243 |
|
/* sum pixels in box */ |
244 |
|
n = 0; |
245 |
|
sum[RED] = sum[GRN] = sum[BLU] = 0; |
254 |
|
} |
255 |
|
histo[r][g][b] = p; /* assign pixel */ |
256 |
|
} |
257 |
+ |
if (n >= (1<<23)/HMAX) { /* avoid overflow */ |
258 |
+ |
sum[RED] /= n; |
259 |
+ |
sum[GRN] /= n; |
260 |
+ |
sum[BLU] /= n; |
261 |
+ |
n = 1; |
262 |
+ |
} |
263 |
|
if (n) { /* compute average */ |
264 |
|
clrtab[p][RED] = sum[RED]*256/NRED/n; |
265 |
|
clrtab[p][GRN] = sum[GRN]*256/NGRN/n; |