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/* Copyright (c) 1992 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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* Simple median-cut color quantization based on colortab.c |
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*/ |
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#define part(cn) ((cn)>>2) |
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#define prim(cn) ((cn)&3) |
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/* our color table (global) */ |
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BYTE clrtab[256][3]; |
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extern BYTE clrtab[256][3]; |
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/* histogram of colors / color assignments */ |
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static unsigned histo[NRED][NGRN][NBLU]; |
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#define cndx(c) histo[((c)[RED]*NRED)>>8][((c)[GRN]*NGRN)>>8][((c)[BLU]*NBLU)>>8] |
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/* maximum propagated error during dithering */ |
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#define MAXERR 20 |
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/* define CLOSEST to get closest colors */ |
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#define CLOSEST 1 |
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#ifndef CLOSEST |
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#ifdef SPEED |
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#if SPEED > 8 |
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#define CLOSEST 1 /* this step takes a little longer */ |
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#endif |
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#endif |
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#endif |
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static cut(), mktabent(), closest(), addneigh(), setclosest(); |
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static int split(); |
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static unsigned dist(); |
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new_histo() /* clear our histogram */ |
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new_histo(n) /* clear our histogram */ |
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int n; |
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{ |
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bzero((char *)histo, sizeof(histo)); |
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return(0); |
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} |
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#ifdef CLOSEST |
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closest(ncolors); /* ensure colors picked are closest */ |
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#endif |
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/* reset dithering function */ |
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dith_colrs((BYTE *)NULL, (COLR *)NULL, 0); |
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/* return new color table size */ |
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return(ncolors); |
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} |
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register COLR *cs; |
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int n; |
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{ |
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static short (*cerr)[3]; |
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static short (*cerr)[3] = NULL; |
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static int N = 0; |
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int err[3], errp[3]; |
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register int x, i; |
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if (n != N) { /* get error propogation array */ |
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if (N) |
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cerr = (short (*)[3])realloc((char *)cerr, |
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3*n*sizeof(short)); |
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else |
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if (N) { |
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free((void *)cerr); |
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cerr = NULL; |
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} |
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if (n) |
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cerr = (short (*)[3])malloc(3*n*sizeof(short)); |
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if (cerr == NULL) { |
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N = 0; |
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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]) |
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int p; |
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register int box[3][2]; |
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{ |
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long sum[3]; |
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int r, g, n; |
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register int b, c; |
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unsigned long sum[3]; |
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unsigned r, g; |
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unsigned long n; |
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register unsigned b, c; |
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/* sum pixels in box */ |
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n = 0; |
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sum[RED] = sum[GRN] = sum[BLU] = 0; |
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} |
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histo[r][g][b] = p; /* assign pixel */ |
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} |
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if (n >= (1L<<23)/HMAX) { /* avoid overflow */ |
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sum[RED] /= n; |
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sum[GRN] /= n; |
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sum[BLU] /= n; |
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n = 1; |
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} |
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if (n) { /* compute average */ |
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clrtab[p][RED] = sum[RED]*256/NRED/n; |
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clrtab[p][GRN] = sum[GRN]*256/NGRN/n; |
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neigh[i][0] = i; /* identity is terminator */ |
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} |
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/* make neighbor lists */ |
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for (r = 0; r < NRED-1; r++) |
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for (g = 0; g < NGRN-1; g++) |
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for (b = 0; b < NBLU-1; b++) { |
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if (histo[r][g][b] != histo[r+1][g][b]) |
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for (r = 0; r < NRED; r++) |
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for (g = 0; g < NGRN; g++) |
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for (b = 0; b < NBLU; b++) { |
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if (r < NRED-1 && histo[r][g][b] != histo[r+1][g][b]) |
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addneigh(neigh, histo[r][g][b], histo[r+1][g][b]); |
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if (histo[r][g][b] != histo[r][g+1][b]) |
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if (g < NGRN-1 && histo[r][g][b] != histo[r][g+1][b]) |
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addneigh(neigh, histo[r][g][b], histo[r][g+1][b]); |
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if (histo[r][g][b] != histo[r][g][b+1]) |
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if (b < NBLU-1 && histo[r][g][b] != histo[r][g][b+1]) |
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addneigh(neigh, histo[r][g][b], histo[r][g][b+1]); |
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} |
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/* assign closest values */ |
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register BYTE col[3]; |
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int r, g, b; |
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{ |
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register unsigned tmp; |
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register int tmp; |
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register unsigned sum; |
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tmp = col[RED]*NRED/256 - r; |
