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/* Copyright (c) 1989 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* colortab.c - allocate and control dynamic color table. |
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* |
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* histogram is cleared. This algorithm |
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* performs only as well as the next drawing's color |
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* distribution is correlated to the last. |
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* |
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* External symbols declared in drvier.h |
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*/ |
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#include "copyright.h" |
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#include <string.h> |
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#include "standard.h" |
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#include "color.h" |
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#define NULL 0 |
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/* histogram resolution */ |
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#define NRED 24 |
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#define NGRN 32 |
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#define NBLU 18 |
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#define NBLU 16 |
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#define HMAX NGRN |
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/* minimum box count for adaptive partition */ |
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#define MINSAMP 7 |
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/* maximum frame buffer depth */ |
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#define FBDEPTH 8 |
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/* color map resolution */ |
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#define MAPSIZ 128 |
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/* maximum distance^2 before color reassign */ |
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#define MAXDST2 12 |
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/* map a color */ |
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#define map_col(c,p) clrmap[p][ colval(c,p)<1. ? \ |
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(int)(colval(c,p)*MAPSIZ) : MAPSIZ-1 ] |
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(int)(colval(c,p)*256.) : 255 ] |
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/* color partition tree */ |
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#define CNODE short |
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#define set_branch(p,c) ((c)<<2|(p)) |
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#define set_branch(p,c) ((c)<<2|(p)) |
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#define set_pval(pv) ((pv)<<2|3) |
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#define is_branch(cn) (((cn)&3)!=3) |
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#define is_pval(cn) (((cn)&3)==3) |
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#define part(cn) ((cn)>>2) |
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#define prim(cn) ((cn)&3) |
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#define pval(cn) ((cn)>>2) |
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/* our color table */ |
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COLR clrtab[1<<FBDEPTH]; |
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static struct tabent { |
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long sum[3]; /* sum of colors using this entry */ |
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int n; /* number of colors */ |
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BYTE ent[3]; /* current table value */ |
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} *clrtab = NULL; |
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/* color cube partition */ |
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static CNODE *ctree = NULL; |
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/* our color correction map */ |
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static BYTE clrmap[3][MAPSIZ]; |
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static BYTE clrmap[3][256]; |
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/* histogram of colors used */ |
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static unsigned histo[NRED][NGRN][NBLU]; |
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/* initial color cube boundaries */ |
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static int CLRCUBE[3][2] = {0,NRED,0,NGRN,0,NBLU}; |
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/* color cube partition */ |
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static CNODE ctree[1<<(FBDEPTH+1)]; |
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static unsigned short histo[NRED][NGRN][NBLU]; |
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/* initial color cube boundary */ |
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static int CLRCUBE[3][2] = {{0,NRED},{0,NGRN},{0,NBLU}}; |
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static int split(); |
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static void cut(); |
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COLR * |
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get_ctab(ncolors) /* assign a color table with max ncolors */ |
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|
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int |
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new_ctab(ncolors) /* start new color table with max ncolors */ |
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int ncolors; |
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{ |
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if (ncolors < 1 || ncolors > 1<<FBDEPTH) |
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return(NULL); |
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/* partition color table */ |
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cut(ctree, FBDEPTH, CLRCUBE, 0, ncolors); |
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int treesize; |
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if (ncolors < 1) |
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return(0); |
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/* free old tables */ |
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if (clrtab != NULL) |
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free((void *)clrtab); |
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if (ctree != NULL) |
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free((void *)ctree); |
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/* get new tables */ |
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for (treesize = 1; treesize < ncolors; treesize <<= 1) |
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; |
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treesize <<= 1; |
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clrtab = (struct tabent *)calloc(ncolors, sizeof(struct tabent)); |
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ctree = (CNODE *)malloc(treesize*sizeof(CNODE)); |
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if (clrtab == NULL || ctree == NULL) |
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return(0); |
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/* partition color space */ |
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cut(ctree, 0, CLRCUBE, 0, ncolors); |
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/* clear histogram */ |
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bzero(histo, sizeof(histo)); |
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/* return color table */ |
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return(clrtab); |
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memset((void *)histo, '\0', sizeof(histo)); |
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/* return number of colors used */ |
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return(ncolors); |
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} |
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int |
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get_pixel(col) /* get pixel for color */ |
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get_pixel(col, set_pixel) /* get pixel for color */ |
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COLOR col; |
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void (*set_pixel)(); |
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{ |
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int r, g, b; |
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int cv[3]; |
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register CNODE *tp; |
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register int h; |
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/* map color */ |
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cv[RED] = map_col(col,RED); |
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cv[GRN] = map_col(col,GRN); |
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cv[BLU] = map_col(col,BLU); |
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/* add to histogram */ |
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/* map color */ |
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r = map_col(col,RED); |
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g = map_col(col,GRN); |
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b = map_col(col,BLU); |
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/* reduce resolution */ |
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cv[RED] = (r*NRED)>>8; |
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cv[GRN] = (g*NGRN)>>8; |
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cv[BLU] = (b*NBLU)>>8; |
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/* add to histogram */ |
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histo[cv[RED]][cv[GRN]][cv[BLU]]++; |
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/* find pixel value in tree */ |
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tp = ctree; |
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for (h = FBDEPTH; h > 0; h--) { |
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if (is_pval(*tp)) |
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break; |
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/* find pixel in tree */ |
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for (tp = ctree, h = 0; is_branch(*tp); h++) |
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if (cv[prim(*tp)] < part(*tp)) |
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tp++; /* left branch */ |
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tp += 1<<h; /* left branch */ |
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else |
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tp += 1<<h; /* right branch */ |
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} |
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#ifdef notdef |
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printf("distance (%d,%d,%d)\n", |
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cv[RED] - clrtab[pval(*tp)][RED]*NRED/256, |
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cv[GRN] - clrtab[pval(*tp)][GRN]*NGRN/256, |
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cv[BLU] - clrtab[pval(*tp)][BLU]*NBLU/256); |
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tp += 1<<(h+1); /* right branch */ |
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h = pval(*tp); |
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/* add to color table */ |
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clrtab[h].sum[RED] += r; |
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clrtab[h].sum[GRN] += g; |
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clrtab[h].sum[BLU] += b; |
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clrtab[h].n++; |
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/* recompute average */ |
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r = clrtab[h].sum[RED] / clrtab[h].n; |
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g = clrtab[h].sum[GRN] / clrtab[h].n; |
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b = clrtab[h].sum[BLU] / clrtab[h].n; |
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/* check for movement */ |
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if (clrtab[h].n == 1 || |
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(r-clrtab[h].ent[RED])*(r-clrtab[h].ent[RED]) + |
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(g-clrtab[h].ent[GRN])*(g-clrtab[h].ent[GRN]) + |
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(b-clrtab[h].ent[BLU])*(b-clrtab[h].ent[BLU]) > MAXDST2) { |
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clrtab[h].ent[RED] = r; |
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clrtab[h].ent[GRN] = g; /* reassign pixel */ |
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clrtab[h].ent[BLU] = b; |
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#ifdef DEBUG |
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sprintf(errmsg, "pixel %d = (%d,%d,%d) (%d refs)\n", |
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h, r, g, b, clrtab[h].n); |
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eputs(errmsg); |
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#endif |
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return(pval(*tp)); |
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(*set_pixel)(h, r, g, b); |
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} |
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return(h); /* return pixel value */ |
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} |
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make_cmap(gam) /* make gamma correction map */ |
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double gam; |
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void |
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make_gmap(gam) /* make gamma correction map */ |
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double gam; |
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{ |
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extern double pow(); |
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double d; |
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register int i; |
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for (i = 0; i < MAPSIZ; i++) { |
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d = pow(i/(double)MAPSIZ, 1.0/gam); |
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clrmap[RED][i] = d * NRED; |
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clrmap[GRN][i] = d * NGRN; |
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clrmap[BLU][i] = d * NBLU; |
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} |
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for (i = 0; i < 256; i++) |
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clrmap[RED][i] = |
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clrmap[GRN][i] = |
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clrmap[BLU][i] = 256.0 * pow((i+0.5)/256.0, 1.0/gam); |
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} |
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static |
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cut(tree, height, box, c0, c1) /* partition color space */ |
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void |
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set_cmap(rmap, gmap, bmap) /* set custom color correction map */ |
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BYTE *rmap, *gmap, *bmap; |
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{ |
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memcpy((void *)clrmap[RED], (void *)rmap, 256); |
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memcpy((void *)clrmap[GRN], (void *)gmap, 256); |
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memcpy((void *)clrmap[BLU], (void *)bmap, 256); |
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} |
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void |
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map_color(rgb, col) /* map a color to a byte triplet */ |
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BYTE rgb[3]; |
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COLOR col; |
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{ |
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rgb[RED] = map_col(col,RED); |
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rgb[GRN] = map_col(col,GRN); |
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rgb[BLU] = map_col(col,BLU); |
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} |
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static void |
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cut(tree, level, box, c0, c1) /* partition color space */ |
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register CNODE *tree; |
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int height; |
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int level; |
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register int box[3][2]; |
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int c0, c1; |
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{ |
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int kb[3][2]; |
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if (c1-c0 == 1) { /* assign color */ |
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clrtab[c0][RED] = ((box[RED][0]+box[RED][1])<<7)/NRED; |
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clrtab[c0][GRN] = ((box[GRN][0]+box[GRN][1])<<7)/NGRN; |
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clrtab[c0][BLU] = ((box[BLU][0]+box[BLU][1])<<7)/NBLU; |
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clrtab[c0][EXP] = COLXS; |
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if (c1-c0 <= 1) { /* assign pixel */ |
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*tree = set_pval(c0); |
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#ifdef notdef |
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printf("final box size = (%d,%d,%d)\n", |
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box[RED][1] - box[RED][0], |
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box[GRN][1] - box[GRN][0], |
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box[BLU][1] - box[BLU][0]); |
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#endif |
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return; |
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} |
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/* split box */ |
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*tree = split(box); |
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bcopy(box, kb, sizeof(kb)); |
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memcpy((void *)kb, (void *)box, sizeof(kb)); |
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/* do left (lesser) branch */ |
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kb[prim(*tree)][1] = part(*tree); |
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cut(tree+1, height-1, kb, c0, (c0+c1)>>1); /* lesser */ |
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cut(tree+(1<<level), level+1, kb, c0, (c0+c1)>>1); |
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/* do right branch */ |
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kb[prim(*tree)][0] = part(*tree); |
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kb[prim(*tree)][1] = box[prim(*tree)][1]; |
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cut(tree+(1<<height), height-1, kb, (c0+c1)>>1, c1); /* greater */ |
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cut(tree+(1<<(level+1)), level+1, kb, (c0+c1)>>1, c1); |
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} |
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#define c0 r |
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register int r, g, b; |
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int pri; |
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int t[HMAX], med; |
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long t[HMAX], med; |
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/* find dominant axis */ |
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pri = RED; |
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if (box[GRN][1]-box[GRN][0] > box[pri][1]-box[pri][0]) |
