| 20 |
|
|
| 21 |
|
#define NULL 0 |
| 22 |
|
/* histogram resolution */ |
| 23 |
< |
#define NRED 28 |
| 23 |
> |
#define NRED 24 |
| 24 |
|
#define NGRN 32 |
| 25 |
< |
#define NBLU 22 |
| 25 |
> |
#define NBLU 16 |
| 26 |
|
#define HMAX NGRN |
| 27 |
|
/* minimum box count for adaptive partition */ |
| 28 |
|
#define MINSAMP 7 |
| 29 |
+ |
/* maximum distance^2 before color reassign */ |
| 30 |
+ |
#define MAXDST2 12 |
| 31 |
|
/* maximum frame buffer depth */ |
| 32 |
|
#define FBDEPTH 8 |
| 31 |
– |
/* color map resolution */ |
| 32 |
– |
#define MAPSIZ 128 |
| 33 |
|
/* map a color */ |
| 34 |
|
#define map_col(c,p) clrmap[p][ colval(c,p)<1. ? \ |
| 35 |
< |
(int)(colval(c,p)*MAPSIZ) : MAPSIZ-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)) |
| 39 |
|
#define set_pval(pv) ((pv)<<2|3) |
| 40 |
+ |
#define is_branch(cn) (((cn)&3)!=3) |
| 41 |
|
#define is_pval(cn) (((cn)&3)==3) |
| 42 |
|
#define part(cn) ((cn)>>2) |
| 43 |
|
#define prim(cn) ((cn)&3) |
| 44 |
|
#define pval(cn) ((cn)>>2) |
| 45 |
|
/* our color table */ |
| 46 |
< |
COLR clrtab[1<<FBDEPTH]; |
| 46 |
> |
static struct tabent { |
| 47 |
> |
long sum[3]; /* sum of colors using this entry */ |
| 48 |
> |
long n; /* number of colors */ |
| 49 |
> |
short ent[3]; /* current table value */ |
| 50 |
> |
} clrtab[1<<FBDEPTH]; |
| 51 |
|
/* our color correction map */ |
| 52 |
< |
static BYTE clrmap[3][MAPSIZ]; |
| 52 |
> |
static BYTE clrmap[3][256]; |
| 53 |
|
/* histogram of colors used */ |
| 54 |
|
static unsigned histo[NRED][NGRN][NBLU]; |
| 55 |
|
/* initial color cube boundaries */ |
| 58 |
|
static CNODE ctree[1<<(FBDEPTH+1)]; |
| 59 |
|
|
| 60 |
|
|
| 61 |
< |
COLR * |
| 62 |
< |
get_ctab(ncolors) /* assign a color table with max ncolors */ |
| 61 |
> |
int |
| 62 |
> |
new_ctab(ncolors) /* start new color table with max ncolors */ |
| 63 |
|
int ncolors; |
| 64 |
|
{ |
| 65 |
< |
if (ncolors < 1 || ncolors > 1<<FBDEPTH) |
| 66 |
< |
return(NULL); |
| 67 |
< |
/* partition color table */ |
| 68 |
< |
cut(ctree, FBDEPTH, CLRCUBE, 0, ncolors); |
| 65 |
> |
if (ncolors < 1) |
| 66 |
> |
return(0); |
| 67 |
> |
if (ncolors > 1<<FBDEPTH) |
| 68 |
> |
ncolors = 1<<FBDEPTH; |
| 69 |
> |
/* clear color table */ |
| 70 |
> |
bzero(clrtab, sizeof(clrtab)); |
| 71 |
> |
/* partition color space */ |
| 72 |
> |
cut(ctree, 0, CLRCUBE, 0, ncolors); |
| 73 |
|
/* clear histogram */ |
| 74 |
|
bzero(histo, sizeof(histo)); |
| 75 |
< |
/* return color table */ |
| 76 |
< |
return(clrtab); |
| 75 |
> |
/* return number of colors used */ |
| 76 |
> |
return(ncolors); |
| 77 |
|
} |
| 78 |
|
|
| 79 |
|
|
| 80 |
|
int |
| 81 |
< |
get_pixel(col) /* get pixel for color */ |
| 81 |
> |
get_pixel(col, set_pixel) /* get pixel for color */ |
| 82 |
|
COLOR col; |
| 83 |
+ |
int (*set_pixel)(); |
| 84 |
|
{ |
| 85 |
+ |
int r, g, b; |
| 86 |
|
int cv[3]; |
| 87 |
< |
register CNODE *tp; |
| 87 |
> |
register union { CNODE *t; struct tabent *e; } p; |
| 88 |
|
register int h; |
| 89 |
< |
/* map color */ |
| 90 |
< |
cv[RED] = map_col(col,RED); |
| 91 |
< |
cv[GRN] = map_col(col,GRN); |
| 92 |
< |
cv[BLU] = map_col(col,BLU); |
| 93 |
< |
/* add to histogram */ |
| 89 |
> |
/* map color */ |
| 90 |
> |
r = map_col(col,RED); |
| 91 |
> |
g = map_col(col,GRN); |
| 92 |
> |
b = map_col(col,BLU); |
| 93 |
> |
/* reduce resolution */ |
| 94 |
> |
cv[RED] = (r*NRED)>>8; |
| 95 |
> |
cv[GRN] = (g*NGRN)>>8; |
| 96 |
> |
cv[BLU] = (b*NBLU)>>8; |
| 97 |
> |
/* add to histogram */ |
| 98 |
|
histo[cv[RED]][cv[GRN]][cv[BLU]]++; |
| 99 |
< |
/* find pixel value in tree */ |
| 100 |
< |
tp = ctree; |
| 101 |
< |
for (h = FBDEPTH; h > 0; h--) { |
| 102 |
< |
if (is_pval(*tp)) |
| 88 |
< |
break; |
| 89 |
< |
if (cv[prim(*tp)] < part(*tp)) |
| 90 |
< |
tp++; /* left branch */ |
| 99 |
> |
/* find pixel in tree */ |
| 100 |
> |
for (p.t = ctree, h = 0; is_branch(*p.t); h++) |
| 101 |
> |
if (cv[prim(*p.t)] < part(*p.t)) |
| 102 |
> |
p.t += 1<<h; /* left branch */ |
| 103 |
|
else |
| 104 |
< |
tp += 1<<h; /* right branch */ |
| 105 |
< |
} |
| 104 |
> |
p.t += 1<<(h+1); /* right branch */ |
| 105 |
> |
h = pval(*p.t); |
| 106 |
> |
/* add to color table */ |
| 107 |
> |
p.e = clrtab + h; |
| 108 |
> |
/* add to sum */ |
| 109 |
> |
p.e->sum[RED] += r; |
| 110 |
> |
p.e->sum[GRN] += g; |
| 111 |
> |
p.e->sum[BLU] += b; |
| 112 |
> |
p.e->n++; |
| 113 |
> |
/* recompute average */ |
| 114 |
> |
r = p.e->sum[RED] / p.e->n; |
| 115 |
> |
g = p.e->sum[GRN] / p.e->n; |
| 116 |
> |
b = p.e->sum[BLU] / p.e->n; |
| 117 |
> |
/* check for movement */ |
| 118 |
> |
if (p.e->n == 1 || |
| 119 |
> |
(r-p.e->ent[RED])*(r-p.e->ent[RED]) + |
| 120 |
> |
(g-p.e->ent[GRN])*(g-p.e->ent[GRN]) + |
| 121 |
> |
(b-p.e->ent[BLU])*(b-p.e->ent[BLU]) > MAXDST2) { |
| 122 |
> |
p.e->ent[RED] = r; |
| 123 |
> |
p.e->ent[GRN] = g; /* reassign pixel */ |
| 124 |
> |
p.e->ent[BLU] = b; |
| 125 |
|
#ifdef notdef |
| 126 |
< |
printf("distance (%d,%d,%d)\n", |
| 127 |
< |
cv[RED] - clrtab[pval(*tp)][RED]*NRED/256, |
| 97 |
< |
cv[GRN] - clrtab[pval(*tp)][GRN]*NGRN/256, |
| 98 |
< |
cv[BLU] - clrtab[pval(*tp)][BLU]*NBLU/256); |
| 126 |
> |
printf("pixel %d = (%d,%d,%d) (%d refs)\n", |
| 127 |
> |
h, r, g, b, p.e->n); |
| 128 |
|
#endif |
| 129 |
< |
return(pval(*tp)); |
| 129 |
> |
(*set_pixel)(h, r, g, b); |
| 130 |
> |
} |
| 131 |
> |
return(h); /* return pixel value */ |
| 132 |
|
} |
| 133 |
|
|
| 134 |
|
|
| 135 |
< |
make_cmap(gam) /* make gamma correction map */ |
| 135 |
> |
make_gmap(gam) /* make gamma correction map */ |
| 136 |
|
double gam; |
| 137 |
|
{ |
| 138 |
|
extern double pow(); |
| 108 |
– |
double d; |
| 139 |
|
register int i; |
| 140 |
|
|
| 141 |
< |
for (i = 0; i < MAPSIZ; i++) { |
| 142 |
< |
d = pow(i/(double)MAPSIZ, 1.0/gam); |
| 143 |
< |
clrmap[RED][i] = d * NRED; |
| 144 |
< |
clrmap[GRN][i] = d * NGRN; |
| 115 |
< |
clrmap[BLU][i] = d * NBLU; |
| 116 |
< |
} |
| 141 |
> |
for (i = 0; i < 256; i++) |
| 142 |
> |
clrmap[RED][i] = |
| 143 |
> |
clrmap[GRN][i] = |
| 144 |
> |
clrmap[BLU][i] = 256.0 * pow(i/256.0, 1.0/gam); |
| 145 |
|
} |
| 146 |
|
|
| 147 |
|
|
| 148 |
+ |
set_cmap(rmap, gmap, bmap) /* set custom color correction map */ |
| 149 |
+ |
BYTE *rmap, *gmap, *bmap; |
| 150 |
+ |
{ |
| 151 |
+ |
bcopy(rmap, clrmap[RED], 256); |
| 152 |
+ |
bcopy(gmap, clrmap[GRN], 256); |
| 153 |
+ |
bcopy(bmap, clrmap[BLU], 256); |
| 154 |
+ |
} |
| 155 |
+ |
|
| 156 |
+ |
|
| 157 |
|
static |
| 158 |
< |
cut(tree, height, box, c0, c1) /* partition color space */ |
| 158 |
> |
cut(tree, level, box, c0, c1) /* partition color space */ |
| 159 |
|
register CNODE *tree; |
| 160 |
< |
int height; |
| 160 |
> |
int level; |
| 161 |
|
register int box[3][2]; |
| 162 |
|
int c0, c1; |
| 163 |
|
{ |
| 164 |
|
int kb[3][2]; |
| 165 |
|
|
| 166 |
< |
if (c1-c0 == 1) { /* assign color */ |
| 130 |
< |
clrtab[c0][RED] = ((box[RED][0]+box[RED][1])<<7)/NRED; |
| 131 |
< |
clrtab[c0][GRN] = ((box[GRN][0]+box[GRN][1])<<7)/NGRN; |
| 132 |
< |
clrtab[c0][BLU] = ((box[BLU][0]+box[BLU][1])<<7)/NBLU; |
| 133 |
< |
clrtab[c0][EXP] = COLXS; |
| 166 |
> |
if (c1-c0 <= 1) { /* assign pixel */ |
| 167 |
|
*tree = set_pval(c0); |
| 135 |
– |
#ifdef notdef |
| 136 |
– |
printf("final box size = (%d,%d,%d)\n", |
| 137 |
– |
box[RED][1] - box[RED][0], |
| 138 |
– |
box[GRN][1] - box[GRN][0], |
| 139 |
– |
box[BLU][1] - box[BLU][0]); |
| 140 |
– |
#endif |
| 168 |
|
return; |
| 169 |
|
} |
| 170 |
|
/* split box */ |
| 171 |
|
*tree = split(box); |
| 172 |
|
bcopy(box, kb, sizeof(kb)); |
| 173 |
+ |
/* do left (lesser) branch */ |
| 174 |
|
kb[prim(*tree)][1] = part(*tree); |
| 175 |
< |
cut(tree+1, height-1, kb, c0, (c0+c1)>>1); /* lesser */ |
| 175 |
> |
cut(tree+(1<<level), level+1, kb, c0, (c0+c1)>>1); |
| 176 |
> |
/* do right branch */ |
| 177 |
|
kb[prim(*tree)][0] = part(*tree); |
| 178 |
|
kb[prim(*tree)][1] = box[prim(*tree)][1]; |
| 179 |
< |
cut(tree+(1<<height), height-1, kb, (c0+c1)>>1, c1); /* greater */ |
| 179 |
> |
cut(tree+(1<<(level+1)), level+1, kb, (c0+c1)>>1, c1); |
| 180 |
|
} |
| 181 |
|
|
| 182 |
|
|
