| 171 |
|
{ |
| 172 |
|
static const char funcName[] = "tmCvColors"; |
| 173 |
|
static COLOR csmall = {.5*MINLUM, .5*MINLUM, .5*MINLUM}; |
| 174 |
+ |
static BYTE gamtab[1024]; |
| 175 |
+ |
static double curgam = .0; |
| 176 |
|
COLOR cmon; |
| 177 |
|
double lum, slum; |
| 178 |
|
double d; |
| 182 |
|
returnErr(TM_E_TMINVAL); |
| 183 |
|
if ((ls == NULL) | (scan == NULL) | (len < 0)) |
| 184 |
|
returnErr(TM_E_ILLEGAL); |
| 185 |
+ |
if (cs != TM_NOCHROM && fabs(curgam - tms->mongam) < .02) { |
| 186 |
+ |
curgam = tms->mongam; /* (re)build table */ |
| 187 |
+ |
for (i = 1024; i--; ) |
| 188 |
+ |
gamtab[i] = (int)(256.*pow((i+.5)/1024., 1./curgam)); |
| 189 |
+ |
} |
| 190 |
|
for (i = len; i--; ) { |
| 191 |
|
if (tmNeedMatrix(tms)) { /* get monitor RGB */ |
| 192 |
|
colortrans(cmon, tms->cmat, scan[i]); |
| 233 |
|
cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
| 234 |
|
} |
| 235 |
|
d = tms->clf[RED]*cmon[RED]/lum; |
| 236 |
< |
cs[3*i ] = d>=.999 ? 255 : |
| 230 |
< |
(int)(256.*pow(d, 1./tms->mongam)); |
| 236 |
> |
cs[3*i ] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
| 237 |
|
d = tms->clf[GRN]*cmon[GRN]/lum; |
| 238 |
< |
cs[3*i+1] = d>=.999 ? 255 : |
| 233 |
< |
(int)(256.*pow(d, 1./tms->mongam)); |
| 238 |
> |
cs[3*i+1] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
| 239 |
|
d = tms->clf[BLU]*cmon[BLU]/lum; |
| 240 |
< |
cs[3*i+2] = d>=.999 ? 255 : |
| 236 |
< |
(int)(256.*pow(d, 1./tms->mongam)); |
| 240 |
> |
cs[3*i+2] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
| 241 |
|
} |
| 242 |
|
returnOK; |
| 243 |
|
} |
