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/* Copyright 1988 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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CIQ - main program for color image quantization |
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options for Floyd-Steinberg dithering by minimization of accumulated error |
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Greg Ward 1 March 88, modified for arbitrary picture sizes |
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*/ |
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#include <string.h> |
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#include "standard.h" |
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#include "ciq.h" |
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#define table(m,r,g,b) hist[m[0][r]|m[1][g]|m[2][b]] /* histogram/pvtable */ |
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colormap color; /* quantization colormap */ |
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int n; /* number of colors in it */ |
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#define ERRMAX 20 /* maximum allowed propagated error, |
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if >=255 then no clamping */ |
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static void sample(colormap ocm); |
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static void convertmap(colormap in, colormap out); |
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static void draw_nodith(colormap ocm); |
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static void draw_dith(colormap ocm); |
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/*----------------------------------------------------------------------*/ |
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ciq(dith,nw,synth,cm) |
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int dith; /* is dithering desired? 0=no, 1=yes */ |
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int nw; /* number of colors wanted in output image */ |
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int synth; /* synthesize colormap? 0=no, 1=yes */ |
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colormap cm; /* quantization colormap */ |
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/* read if synth=0; always written */ |
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void |
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ciq( |
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int dith, /* is dithering desired? 0=no, 1=yes */ |
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int nw, /* number of colors wanted in output image */ |
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int synth, /* synthesize colormap? 0=no, 1=yes */ |
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colormap cm /* quantization colormap */ |
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) /* read if synth=0; always written */ |
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{ |
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int na,i; |
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colormap ocm; |
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if (synth) |
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n = makecm(nw,&na); /* analyze histogram and synthesize colormap */ |
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else { |
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bcopy(cm,color,sizeof color); |
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memcpy((void *)color,(void *)cm,sizeof color); |
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n = nw; |
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na = 0; |
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for (i=0; i<len; i++) if (hist[i]) na++; |
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} |
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picwritecm(color); |
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initializeclosest(); |
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if (dith) |
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draw_dith(ocm); |
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else { |
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draw_nodith(ocm); |
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} |
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bcopy(color,cm,sizeof color); |
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memcpy((void *)cm,(void *)color,sizeof color); |
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/*endclosest();*/ |
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} |
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/*----------------------------------------------------------------------*/ |
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sample(ocm) /* make color frequency table (histogram) */ |
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colormap ocm; |
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static void |
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sample( /* make color frequency table (histogram) */ |
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colormap ocm |
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) |
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{ |
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register int x,y; |
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register rgbpixel *lp; |
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for (lp=line, x=0; x<xmax; x++, lp++) |
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table(map,lp->r,lp->g,lp->b)++; |
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} |
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free((char *)line); |
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free((void *)line); |
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} |
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convertmap(in,out) /* convert to shifted color map */ |
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register colormap in,out; |
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static void |
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convertmap( /* convert to shifted color map */ |
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register colormap in, |
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register colormap out |
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) |
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{ |
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register int j; |
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} |
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} |
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draw_nodith(ocm) /* quantize without dithering */ |
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colormap ocm; /* colormap for orig */ |
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static void |
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draw_nodith( /* quantize without dithering */ |
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colormap ocm /* colormap for orig */ |
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) |
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{ |
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register int x,y; |
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register rgbpixel *lp; |
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oline[x] = table(map,lp->r,lp->g,lp->b); |
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picwriteline(y,oline); |
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} |
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free((char *)iline); |
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free((char *)oline); |
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free((void *)iline); |
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free((void *)oline); |
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} |
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draw_dith(ocm) /* quantize with dithering */ |
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colormap ocm; /* colormap for orig */ |
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static void |
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draw_dith( /* quantize with dithering */ |
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colormap ocm /* colormap for orig */ |
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) |
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{ |
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register int *p,*q,rr,gg,bb,v,x,y,*P,*Q,*R; |
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int *buf; |
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Q[0] = Q[1] = Q[2] = 0; |
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picreadline3(y,iline); |
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for (p=P, q=Q, x=0; x<xmax; x++, p+=3, q+=3) { |
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rr = ocm[0][iline[x].r]+p[0]; |
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gg = ocm[1][iline[x].g]+p[1]; /* ideal */ |
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bb = ocm[2][iline[x].b]+p[2]; |
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rr = p[0]; |
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if (rr<-ERRMAX) rr = -ERRMAX; else if (rr>ERRMAX) rr = ERRMAX; |
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gg = p[1]; |
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if (gg<-ERRMAX) gg = -ERRMAX; else if (gg>ERRMAX) gg = ERRMAX; |
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bb = p[2]; |
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if (bb<-ERRMAX) bb = -ERRMAX; else if (bb>ERRMAX) bb = ERRMAX; |
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/* now rr,gg,bb is propagated color */ |
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rr += ocm[0][iline[x].r]; |
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gg += ocm[1][iline[x].g]; /* ideal */ |
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bb += ocm[2][iline[x].b]; |
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if (rr<0) rr = 0; else if (rr>255) rr = 255; |
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if (gg<0) gg = 0; else if (gg>255) gg = 255; |
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if (bb<0) bb = 0; else if (bb>255) bb = 255; |
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} |
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picwriteline(y,oline); |
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} |
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free((char *)iline); |
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free((char *)oline); |
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free((char *)buf); |
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free((void *)iline); |
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free((void *)oline); |
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free((void *)buf); |
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} |
