| 10 |
|
|
| 11 |
|
#include "color.h" |
| 12 |
|
|
| 13 |
< |
#define MAXGSHIFT 2 /* maximum shift for gamma table */ |
| 13 |
> |
#define MAXGSHIFT 15 /* maximum shift for gamma table */ |
| 14 |
|
|
| 15 |
|
static BYTE g_mant[256], g_nexp[256]; |
| 16 |
|
|
| 32 |
|
/* compute gamb -> colr mapping */ |
| 33 |
|
i = 0; |
| 34 |
|
mult = 256.0; |
| 35 |
< |
for (j = 255; j >= 0; j--) { |
| 36 |
< |
rept: |
| 37 |
< |
g_mant[j] = mult * pow((j+.5)/256.0, g); |
| 38 |
< |
if (g_mant[j] < 128) { |
| 35 |
> |
for (j = 255; j > 0; j--) { |
| 36 |
> |
while ((g_mant[j] = mult * pow(j/256.0, g)) < 128) { |
| 37 |
|
i++; |
| 38 |
|
mult *= 2.0; |
| 41 |
– |
goto rept; |
| 39 |
|
} |
| 40 |
|
g_nexp[j] = i; |
| 41 |
|
} |
| 42 |
+ |
g_mant[0] = 0; |
| 43 |
+ |
g_nexp[0] = COLXS; |
| 44 |
|
} |
| 45 |
|
|
| 46 |
|
|
| 128 |
|
register int len; |
| 129 |
|
register int adjust; |
| 130 |
|
{ |
| 131 |
+ |
int minexp; |
| 132 |
+ |
|
| 133 |
+ |
if (adjust == 0) |
| 134 |
+ |
return; |
| 135 |
+ |
minexp = adjust < 0 ? -adjust : 0; |
| 136 |
|
while (len-- > 0) { |
| 137 |
< |
scan[0][EXP] += adjust; |
| 137 |
> |
if (scan[0][EXP] <= minexp) |
| 138 |
> |
scan[0][RED] = scan[0][GRN] = scan[0][BLU] = |
| 139 |
> |
scan[0][EXP] = 0; |
| 140 |
> |
else |
| 141 |
> |
scan[0][EXP] += adjust; |
| 142 |
|
scan++; |
| 143 |
|
} |
| 144 |
|
} |
