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/* Copyright (c) 1986 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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/* |
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* color.c - routines for color calculations. |
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* |
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* 10/10/85 |
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* Externals declared in color.h |
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*/ |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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|
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#include "color.h" |
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#include <stdlib.h> |
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|
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#ifdef SPEC_RGB |
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/* |
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* The following table contains the CIE tristimulus integrals |
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* for X, Y, and Z. The table is cumulative, so that |
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* each color coordinate integrates to 1. |
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*/ |
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#include <math.h> |
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|
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#define STARTWL 380 /* starting wavelength (nanometers) */ |
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#define INCWL 10 /* wavelength increment */ |
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#define NINC 40 /* # of values */ |
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#include "color.h" |
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|
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static BYTE chroma[3][NINC] = { |
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{ /* X */ |
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0, 0, 0, 2, 6, 13, 22, 30, 36, 41, |
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42, 43, 43, 44, 46, 52, 60, 71, 87, 106, |
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128, 153, 178, 200, 219, 233, 243, 249, 252, 254, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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}, { /* Y */ |
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0, 0, 0, 0, 0, 1, 2, 4, 7, 11, |
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17, 24, 34, 48, 64, 84, 105, 127, 148, 169, |
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188, 205, 220, 232, 240, 246, 250, 253, 254, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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}, { /* Z */ |
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0, 0, 2, 10, 32, 66, 118, 153, 191, 220, |
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237, 246, 251, 253, 254, 255, 255, 255, 255, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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} |
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}; |
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#define MINELEN 8 /* minimum scanline length for encoding */ |
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#define MAXELEN 0x7fff /* maximum scanline length for encoding */ |
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#define MINRUN 4 /* minimum run length */ |
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|
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spec_rgb(col, s, e) /* comput RGB color from spectral range */ |
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COLOR col; |
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int s, e; |
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char * |
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tempbuffer(len) /* get a temporary buffer */ |
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unsigned int len; |
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{ |
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COLOR ciecolor; |
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static char *tempbuf = NULL; |
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static unsigned tempbuflen = 0; |
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|
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spec_cie(ciecolor, s, e); |
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cie_rgb(col, ciecolor); |
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} |
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|
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|
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spec_cie(col, s, e) /* compute a color from a spectral range */ |
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COLOR col; /* returned color */ |
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int s, e; /* starting and ending wavelengths */ |
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{ |
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register int i, d, r; |
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|
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s -= STARTWL; |
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if (s < 0) |
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s = 0; |
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|
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e -= STARTWL; |
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if (e >= INCWL*(NINC - 1)) |
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e = INCWL*(NINC - 1) - 1; |
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|
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d = e / INCWL; /* interpolate values */ |
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r = e % INCWL; |
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for (i = 0; i < 3; i++) |
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col[i] = chroma[i][d]*(INCWL - r) + chroma[i][d + 1]*r; |
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|
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d = s / INCWL; |
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r = s % INCWL; |
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for (i = 0; i < 3; i++) |
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col[i] -= chroma[i][d]*(INCWL - r) - chroma[i][d + 1]*r; |
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|
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col[RED] = (col[RED] + 0.5) / (256*INCWL); |
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col[GRN] = (col[GRN] + 0.5) / (256*INCWL); |
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col[BLU] = (col[BLU] + 0.5) / (256*INCWL); |
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} |
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|
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|
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cie_rgb(rgbcolor, ciecolor) /* convert CIE to RGB (NTSC) */ |
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register COLOR rgbcolor, ciecolor; |
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{ |
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static float cmat[3][3] = { |
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1.73, -.48, -.26, |
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-.81, 1.65, -.02, |
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.08, -.17, 1.28, |
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}; |
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register int i; |
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|
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for (i = 0; i < 3; i++) { |
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rgbcolor[i] = cmat[i][0]*ciecolor[0] + |
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cmat[i][1]*ciecolor[1] + |
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cmat[i][2]*ciecolor[2] ; |
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if (rgbcolor[i] < 0.0) |
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rgbcolor[i] = 0.0; |
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if (len > tempbuflen) { |
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if (tempbuflen > 0) |
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tempbuf = (char *)realloc(tempbuf, len); |
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else |
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tempbuf = (char *)malloc(len); |
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tempbuflen = tempbuf==NULL ? 0 : len; |
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} |
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return(tempbuf); |
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} |
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#endif |
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|
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fputresolu(ord, xres, yres, fp) /* put x and y resolution */ |
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register int ord; |
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int xres, yres; |
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FILE *fp; |
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{ |
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if (ord&YMAJOR) |
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fprintf(fp, "%cY %d %cX %d\n", |
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ord&YDECR ? '-' : '+', yres, |
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ord&XDECR ? '-' : '+', xres); |
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else |
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fprintf(fp, "%cX %d %cY %d\n", |
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ord&XDECR ? '-' : '+', xres, |
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ord&YDECR ? '-' : '+', yres); |
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} |
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|
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|
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fgetresolu(xrp, yrp, fp) /* get x and y resolution */ |
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int *xrp, *yrp; |
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FILE *fp; |
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{ |
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char buf[64], *xndx, *yndx; |
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register char *cp; |
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register int ord; |
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|
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if (fgets(buf, sizeof(buf), fp) == NULL) |
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return(-1); |
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xndx = yndx = NULL; |
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for (cp = buf+1; *cp; cp++) |
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if (*cp == 'X') |
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xndx = cp; |
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else if (*cp == 'Y') |
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yndx = cp; |
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if (xndx == NULL || yndx == NULL) |
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return(-1); |
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ord = 0; |
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if (xndx > yndx) ord |= YMAJOR; |
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< |
if (xndx[-1] == '-') ord |= XDECR; |
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< |
if (yndx[-1] == '-') ord |= YDECR; |
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if ((*xrp = atoi(xndx+1)) <= 0) |
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return(-1); |
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if ((*yrp = atoi(yndx+1)) <= 0) |
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return(-1); |
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< |
return(ord); |
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} |
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|
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|
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int |
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fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
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register COLR *scanline; |
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int len; |
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register FILE *fp; |
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{ |
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COLR lastcolr; |
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int rept; |
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register int i, j, beg, cnt = 1; |
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int c2; |
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|
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lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
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lastcolr[EXP] = 0; |
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rept = 0; |
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|
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< |
while (len > 0) { |
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< |
if (scanline[0][EXP] == lastcolr[EXP] && |
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scanline[0][RED] == lastcolr[RED] && |
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scanline[0][GRN] == lastcolr[GRN] && |
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scanline[0][BLU] == lastcolr[BLU]) |
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rept++; |
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else { |
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while (rept) { /* write out count */ |
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putc(1, fp); |
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putc(1, fp); |
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putc(1, fp); |
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putc(rept & 255, fp); |
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rept >>= 8; |
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if (len < MINELEN | len > MAXELEN) /* OOBs, write out flat */ |
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> |
return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len); |
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/* put magic header */ |
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putc(2, fp); |
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> |
putc(2, fp); |
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> |
putc(len>>8, fp); |
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> |
putc(len&255, fp); |
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> |
/* put components seperately */ |
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> |
for (i = 0; i < 4; i++) { |
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> |
for (j = 0; j < len; j += cnt) { /* find next run */ |
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> |
for (beg = j; beg < len; beg += cnt) { |
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> |
for (cnt = 1; cnt < 127 && beg+cnt < len && |
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> |
scanline[beg+cnt][i] == scanline[beg][i]; cnt++) |
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> |
; |
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> |
if (cnt >= MINRUN) |
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> |
break; /* long enough */ |
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> |
} |
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> |
if (beg-j > 1 && beg-j < MINRUN) { |
| 70 |
> |
c2 = j+1; |
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> |
while (scanline[c2++][i] == scanline[j][i]) |
| 72 |
> |
if (c2 == beg) { /* short run */ |
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> |
putc(128+beg-j, fp); |
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> |
putc(scanline[j][i], fp); |
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> |
j = beg; |
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> |
break; |
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} |
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putc(scanline[0][RED], fp); /* new color */ |
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– |
putc(scanline[0][GRN], fp); |
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– |
putc(scanline[0][BLU], fp); |
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– |
putc(scanline[0][EXP], fp); |
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– |
copycolr(lastcolr, scanline[0]); |
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– |
rept = 0; |
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} |
| 79 |
< |
scanline++; |
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< |
len--; |
| 79 |
> |
while (j < beg) { /* write out non-run */ |
| 80 |
> |
if ((c2 = beg-j) > 128) c2 = 128; |
| 81 |
> |
putc(c2, fp); |
| 82 |
> |
while (c2--) |
| 83 |
> |
putc(scanline[j++][i], fp); |
| 84 |
> |
} |
| 85 |
> |
if (cnt >= MINRUN) { /* write out run */ |
| 86 |
> |
putc(128+cnt, fp); |
| 87 |
> |
putc(scanline[beg][i], fp); |
| 88 |
> |
} else |
| 89 |
> |
cnt = 0; |
| 90 |
> |
} |
| 91 |
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} |
| 192 |
– |
while (rept) { /* write out count */ |
| 193 |
– |
putc(1, fp); |
| 194 |
– |
putc(1, fp); |
| 195 |
– |
putc(1, fp); |
| 196 |
– |
putc(rept & 255, fp); |
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– |
rept >>= 8; |
| 198 |
– |
} |
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return(ferror(fp) ? -1 : 0); |
| 93 |
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} |
| 94 |
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|
| 95 |
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|
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< |
freadcolrs(scanline, len, fp) /* read in a colr scanline */ |
| 96 |
> |
static int |
| 97 |
> |
oldreadcolrs(scanline, len, fp) /* read in an old colr scanline */ |
| 98 |
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register COLR *scanline; |
| 99 |
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int len; |
| 100 |
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register FILE *fp; |
| 130 |
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} |
| 131 |
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|
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|
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+ |
int |
| 134 |
+ |
freadcolrs(scanline, len, fp) /* read in an encoded colr scanline */ |
| 135 |
+ |
register COLR *scanline; |
| 136 |
+ |
int len; |
| 137 |
+ |
register FILE *fp; |
| 138 |
+ |
{ |
| 139 |
+ |
register int i, j; |
| 140 |
+ |
int code, val; |
| 141 |
+ |
/* determine scanline type */ |
| 142 |
+ |
if (len < MINELEN | len > MAXELEN) |
| 143 |
+ |
return(oldreadcolrs(scanline, len, fp)); |
| 144 |
+ |
if ((i = getc(fp)) == EOF) |
| 145 |
+ |
return(-1); |
| 146 |
+ |
if (i != 2) { |
| 147 |
+ |
ungetc(i, fp); |
| 148 |
+ |
return(oldreadcolrs(scanline, len, fp)); |
| 149 |
+ |
} |
| 150 |
+ |
scanline[0][GRN] = getc(fp); |
| 151 |
+ |
scanline[0][BLU] = getc(fp); |
| 152 |
+ |
if ((i = getc(fp)) == EOF) |
| 153 |
+ |
return(-1); |
| 154 |
+ |
if (scanline[0][GRN] != 2 || scanline[0][BLU] & 128) { |
| 155 |
+ |
scanline[0][RED] = 2; |
| 156 |
+ |
scanline[0][EXP] = i; |
| 157 |
+ |
return(oldreadcolrs(scanline+1, len-1, fp)); |
| 158 |
+ |
} |
| 159 |
+ |
if ((scanline[0][BLU]<<8 | i) != len) |
| 160 |
+ |
return(-1); /* length mismatch! */ |
| 161 |
+ |
/* read each component */ |
| 162 |
+ |
for (i = 0; i < 4; i++) |
| 163 |
+ |
for (j = 0; j < len; ) { |
| 164 |
+ |
if ((code = getc(fp)) == EOF) |
| 165 |
+ |
return(-1); |
| 166 |
+ |
if (code > 128) { /* run */ |
| 167 |
+ |
code &= 127; |
| 168 |
+ |
if ((val = getc(fp)) == EOF) |
| 169 |
+ |
return -1; |
| 170 |
+ |
while (code--) |
| 171 |
+ |
scanline[j++][i] = val; |
| 172 |
+ |
} else /* non-run */ |
| 173 |
+ |
while (code--) { |
| 174 |
+ |
if ((val = getc(fp)) == EOF) |
| 175 |
+ |
return -1; |
| 176 |
+ |
scanline[j++][i] = val; |
| 177 |
+ |
} |
| 178 |
+ |
} |
| 179 |
+ |
return(0); |
| 180 |
+ |
} |
| 181 |
+ |
|
| 182 |
+ |
|
| 183 |
+ |
int |
| 184 |
|
fwritescan(scanline, len, fp) /* write out a scanline */ |
| 185 |
|
register COLOR *scanline; |
| 186 |
|
int len; |
| 187 |
< |
register FILE *fp; |
| 187 |
> |
FILE *fp; |
| 188 |
|
{ |
| 189 |
< |
COLR lastcolr, thiscolr; |
| 190 |
< |
int rept; |
| 191 |
< |
|
| 192 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
| 193 |
< |
lastcolr[EXP] = 0; |
| 194 |
< |
rept = 0; |
| 195 |
< |
|
| 196 |
< |
while (len > 0) { |
| 197 |
< |
setcolr(thiscolr, scanline[0][RED], |
| 189 |
> |
COLR *clrscan; |
| 190 |
> |
int n; |
| 191 |
> |
register COLR *sp; |
| 192 |
> |
/* get scanline buffer */ |
| 193 |
> |
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
| 194 |
> |
return(-1); |
| 195 |
> |
clrscan = sp; |
| 196 |
> |
/* convert scanline */ |
| 197 |
> |
n = len; |
| 198 |
> |
while (n-- > 0) { |
| 199 |
> |
setcolr(sp[0], scanline[0][RED], |
| 200 |
|
scanline[0][GRN], |
| 201 |
|
scanline[0][BLU]); |
| 255 |
– |
if (thiscolr[EXP] == lastcolr[EXP] && |
| 256 |
– |
thiscolr[RED] == lastcolr[RED] && |
| 257 |
– |
thiscolr[GRN] == lastcolr[GRN] && |
| 258 |
– |
thiscolr[BLU] == lastcolr[BLU]) |
| 259 |
– |
rept++; |
| 260 |
– |
else { |
| 261 |
– |
while (rept) { /* write out count */ |
| 262 |
– |
putc(1, fp); |
| 263 |
– |
putc(1, fp); |
| 264 |
– |
putc(1, fp); |
| 265 |
– |
putc(rept & 255, fp); |
| 266 |
– |
rept >>= 8; |
| 267 |
– |
} |
| 268 |
– |
putc(thiscolr[RED], fp); /* new color */ |
| 269 |
– |
putc(thiscolr[GRN], fp); |
| 270 |
– |
putc(thiscolr[BLU], fp); |
| 271 |
– |
putc(thiscolr[EXP], fp); |
| 272 |
– |
copycolr(lastcolr, thiscolr); |
| 273 |
– |
rept = 0; |
| 274 |
– |
} |
| 202 |
|
scanline++; |
| 203 |
< |
len--; |
| 203 |
> |
sp++; |
| 204 |
|
} |
| 205 |
< |
while (rept) { /* write out count */ |
| 279 |
< |
putc(1, fp); |
| 280 |
< |
putc(1, fp); |
| 281 |
< |
putc(1, fp); |
| 282 |
< |
putc(rept & 255, fp); |
| 283 |
< |
rept >>= 8; |
| 284 |
< |
} |
| 285 |
< |
return(ferror(fp) ? -1 : 0); |
| 205 |
> |
return(fwritecolrs(clrscan, len, fp)); |
| 206 |
|
} |
| 207 |
|
|
| 208 |
|
|
| 209 |
+ |
int |
| 210 |
|
freadscan(scanline, len, fp) /* read in a scanline */ |
| 211 |
|
register COLOR *scanline; |
| 212 |
|
int len; |
| 213 |
< |
register FILE *fp; |
| 213 |
> |
FILE *fp; |
| 214 |
|
{ |
| 215 |
< |
COLR thiscolr; |
| 216 |
< |
int rshift; |
| 217 |
< |
register int i; |
| 218 |
< |
|
| 219 |
< |
rshift = 0; |
| 220 |
< |
|
| 221 |
< |
while (len > 0) { |
| 222 |
< |
thiscolr[RED] = getc(fp); |
| 223 |
< |
thiscolr[GRN] = getc(fp); |
| 224 |
< |
thiscolr[BLU] = getc(fp); |
| 225 |
< |
thiscolr[EXP] = getc(fp); |
| 226 |
< |
if (feof(fp) || ferror(fp)) |
| 227 |
< |
return(-1); |
| 228 |
< |
if (thiscolr[RED] == 1 && |
| 229 |
< |
thiscolr[GRN] == 1 && |
| 230 |
< |
thiscolr[BLU] == 1) { |
| 231 |
< |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
| 311 |
< |
copycolor(scanline[0], scanline[-1]); |
| 312 |
< |
scanline++; |
| 313 |
< |
len--; |
| 314 |
< |
} |
| 315 |
< |
rshift += 8; |
| 316 |
< |
} else { |
| 317 |
< |
colr_color(scanline[0], thiscolr); |
| 318 |
< |
scanline++; |
| 319 |
< |
len--; |
| 320 |
< |
rshift = 0; |
| 321 |
< |
} |
| 215 |
> |
register COLR *clrscan; |
| 216 |
> |
|
| 217 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
| 218 |
> |
return(-1); |
| 219 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
| 220 |
> |
return(-1); |
| 221 |
> |
/* convert scanline */ |
| 222 |
> |
colr_color(scanline[0], clrscan[0]); |
| 223 |
> |
while (--len > 0) { |
| 224 |
> |
scanline++; clrscan++; |
| 225 |
> |
if (clrscan[0][RED] == clrscan[-1][RED] && |
| 226 |
> |
clrscan[0][GRN] == clrscan[-1][GRN] && |
| 227 |
> |
clrscan[0][BLU] == clrscan[-1][BLU] && |
| 228 |
> |
clrscan[0][EXP] == clrscan[-1][EXP]) |
| 229 |
> |
copycolor(scanline[0], scanline[-1]); |
| 230 |
> |
else |
| 231 |
> |
colr_color(scanline[0], clrscan[0]); |
| 232 |
|
} |
| 233 |
|
return(0); |
| 234 |
|
} |
| 235 |
|
|
| 236 |
|
|
| 237 |
+ |
void |
| 238 |
|
setcolr(clr, r, g, b) /* assign a short color value */ |
| 239 |
|
register COLR clr; |
| 240 |
|
double r, g, b; |
| 241 |
|
{ |
| 331 |
– |
double frexp(); |
| 242 |
|
double d; |
| 243 |
|
int e; |
| 244 |
|
|
| 251 |
|
return; |
| 252 |
|
} |
| 253 |
|
|
| 254 |
< |
d = frexp(d, &e) * 256.0 / d; |
| 254 |
> |
d = frexp(d, &e) * 255.9999 / d; |
| 255 |
|
|
| 256 |
|
clr[RED] = r * d; |
| 257 |
|
clr[GRN] = g * d; |
| 260 |
|
} |
| 261 |
|
|
| 262 |
|
|
| 263 |
+ |
void |
| 264 |
|
colr_color(col, clr) /* convert short to float color */ |
| 265 |
|
register COLOR col; |
| 266 |
|
register COLR clr; |
| 278 |
|
} |
| 279 |
|
|
| 280 |
|
|
| 281 |
< |
normcolrs(scan, len) /* normalize a scanline of colrs */ |
| 371 |
< |
register COLR *scan; |
| 372 |
< |
int len; |
| 373 |
< |
{ |
| 374 |
< |
register int c; |
| 375 |
< |
register int shift; |
| 376 |
< |
|
| 377 |
< |
while (len-- > 0) { |
| 378 |
< |
shift = scan[0][EXP] - COLXS; |
| 379 |
< |
if (shift > 0) { |
| 380 |
< |
if (shift > 8) { |
| 381 |
< |
scan[0][RED] = |
| 382 |
< |
scan[0][GRN] = |
| 383 |
< |
scan[0][BLU] = 255; |
| 384 |
< |
} else { |
| 385 |
< |
shift--; |
| 386 |
< |
c = (scan[0][RED]<<1 | 1) << shift; |
| 387 |
< |
scan[0][RED] = c > 255 ? 255 : c; |
| 388 |
< |
c = (scan[0][GRN]<<1 | 1) << shift; |
| 389 |
< |
scan[0][GRN] = c > 255 ? 255 : c; |
| 390 |
< |
c = (scan[0][BLU]<<1 | 1) << shift; |
| 391 |
< |
scan[0][BLU] = c > 255 ? 255 : c; |
| 392 |
< |
} |
| 393 |
< |
} else if (shift < 0) { |
| 394 |
< |
if (shift < -8) { |
| 395 |
< |
scan[0][RED] = |
| 396 |
< |
scan[0][GRN] = |
| 397 |
< |
scan[0][BLU] = 0; |
| 398 |
< |
} else { |
| 399 |
< |
shift = -1-shift; |
| 400 |
< |
scan[0][RED] = ((scan[0][RED]>>shift)+1)>>1; |
| 401 |
< |
scan[0][GRN] = ((scan[0][GRN]>>shift)+1)>>1; |
| 402 |
< |
scan[0][BLU] = ((scan[0][BLU]>>shift)+1)>>1; |
| 403 |
< |
} |
| 404 |
< |
} |
| 405 |
< |
scan[0][EXP] = COLXS; |
| 406 |
< |
scan++; |
| 407 |
< |
} |
| 408 |
< |
} |
| 409 |
< |
|
| 410 |
< |
|
| 281 |
> |
int |
| 282 |
|
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
| 283 |
|
register COLOR c1, c2; |
| 284 |
|
double md; |
