| 27 |
|
/* minimum box count for adaptive partition */ |
| 28 |
|
#define MINSAMP 7 |
| 29 |
|
/* maximum distance^2 before color reassign */ |
| 30 |
< |
#define MAXDST2 5 |
| 30 |
> |
#define MAXDST2 12 |
| 31 |
|
/* maximum frame buffer depth */ |
| 32 |
|
#define FBDEPTH 8 |
| 33 |
– |
/* color map resolution */ |
| 34 |
– |
#define MAPSIZ 256 |
| 33 |
|
/* map a color */ |
| 34 |
< |
#define map_col(c,p) clrmap[ colval(c,p)<1. ? \ |
| 35 |
< |
(int)(colval(c,p)*MAPSIZ) : MAPSIZ-1 ] |
| 34 |
> |
#define map_col(c,p) clrmap[p][ colval(c,p)<1. ? \ |
| 35 |
> |
(int)(colval(c,p)*256.) : 255 ] |
| 36 |
|
/* color partition tree */ |
| 37 |
|
#define CNODE short |
| 38 |
|
#define set_branch(p,c) ((c)<<2|(p)) |
| 42 |
|
#define prim(cn) ((cn)&3) |
| 43 |
|
#define pval(cn) ((cn)>>2) |
| 44 |
|
/* our color table */ |
| 45 |
< |
struct tabent { |
| 45 |
> |
static struct tabent { |
| 46 |
|
long sum[3]; /* sum of colors using this entry */ |
| 47 |
|
long n; /* number of colors */ |
| 48 |
|
short ent[3]; /* current table value */ |
| 49 |
|
} clrtab[1<<FBDEPTH]; |
| 50 |
|
/* our color correction map */ |
| 51 |
< |
static BYTE clrmap[MAPSIZ]; |
| 51 |
> |
static BYTE clrmap[3][256]; |
| 52 |
|
/* histogram of colors used */ |
| 53 |
|
static unsigned histo[NRED][NGRN][NBLU]; |
| 54 |
|
/* initial color cube boundaries */ |
| 55 |
|
static int CLRCUBE[3][2] = {0,NRED,0,NGRN,0,NBLU}; |
| 56 |
|
/* color cube partition */ |
| 57 |
|
static CNODE ctree[1<<(FBDEPTH+1)]; |
| 60 |
– |
/* callback for pixel assignment */ |
| 61 |
– |
static int (*set_pixel)(); |
| 58 |
|
|
| 59 |
|
|
| 60 |
|
int |
| 61 |
< |
new_ctab(ncolors, cset) /* start new color table with max ncolors */ |
| 61 |
> |
new_ctab(ncolors) /* start new color table with max ncolors */ |
| 62 |
|
int ncolors; |
| 67 |
– |
int (*cset)(); |
| 63 |
|
{ |
| 64 |
< |
if (ncolors < 1 || ncolors > 1<<FBDEPTH || cset == NULL) |
| 64 |
> |
if (ncolors < 1) |
| 65 |
|
return(0); |
| 66 |
< |
/* assign pixel callback routine */ |
| 67 |
< |
set_pixel = cset; |
| 66 |
> |
if (ncolors > 1<<FBDEPTH) |
| 67 |
> |
ncolors = 1<<FBDEPTH; |
| 68 |
|
/* clear color table */ |
| 69 |
|
bzero(clrtab, sizeof(clrtab)); |
| 70 |
|
/* partition color space */ |
| 77 |
|
|
| 78 |
|
|
| 79 |
|
int |
| 80 |
< |
get_pixel(col) /* get pixel for color */ |
| 80 |
> |
get_pixel(col, set_pixel) /* get pixel for color */ |
| 81 |
|
COLOR col; |
| 82 |
+ |
int (*set_pixel)(); |
| 83 |
|
{ |
| 84 |
|
int r, g, b; |
| 85 |
|
int cv[3]; |
| 135 |
|
} |
| 136 |
|
|
| 137 |
|
|
| 138 |
< |
make_cmap(gam) /* make gamma correction map */ |
| 138 |
> |
make_gmap(gam) /* make gamma correction map */ |
| 139 |
|
double gam; |
| 140 |
|
{ |
| 141 |
|
extern double pow(); |
| 142 |
|
register int i; |
| 143 |
|
|
| 144 |
< |
for (i = 0; i < MAPSIZ; i++) |
| 145 |
< |
clrmap[i] = 256.0 * pow(i/(double)MAPSIZ, 1.0/gam); |
| 144 |
> |
for (i = 0; i < 256; i++) |
| 145 |
> |
clrmap[RED][i] = |
| 146 |
> |
clrmap[GRN][i] = |
| 147 |
> |
clrmap[BLU][i] = 256.0 * pow(i/256.0, 1.0/gam); |
| 148 |
> |
} |
| 149 |
> |
|
| 150 |
> |
|
| 151 |
> |
set_cmap(rmap, gmap, bmap) /* set custom color correction map */ |
| 152 |
> |
BYTE *rmap, *gmap, *bmap; |
| 153 |
> |
{ |
| 154 |
> |
bcopy(rmap, clrmap[RED], 256); |
| 155 |
> |
bcopy(gmap, clrmap[GRN], 256); |
| 156 |
> |
bcopy(bmap, clrmap[BLU], 256); |
| 157 |
|
} |
| 158 |
|
|
| 159 |
|
|
