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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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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|
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#include <stdio.h> |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <math.h> |
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#include "color.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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#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
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#undef getc |
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#undef putc |
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#undef ferror |
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#define getc getc_unlocked |
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#define putc putc_unlocked |
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#define ferror ferror_unlocked |
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#endif |
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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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#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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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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|
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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( /* get a temporary buffer */ |
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unsigned int len |
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) |
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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 | (len > tempbuflen)) { |
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if (tempbuflen) |
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free(tempbuf); |
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tempbuf = len ? (char *)malloc(len) : (char *)NULL; |
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tempbuflen = len*(tempbuf != NULL); |
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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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|
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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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int |
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fwritecolrs( /* write out a colr scanline */ |
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COLR *scanline, |
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int len, |
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FILE *fp |
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) |
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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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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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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&0xff, 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)) { |
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c2 = j+1; |
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while (scanline[c2++][i] == scanline[j][i]) |
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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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} |
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scanline++; |
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len--; |
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while (j < beg) { /* write out non-run */ |
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if ((c2 = beg-j) > 128) c2 = 128; |
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putc(c2, fp); |
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> |
while (c2--) |
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putc(scanline[j++][i], fp); |
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> |
} |
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> |
if (cnt >= MINRUN) { /* write out run */ |
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> |
putc(128+cnt, fp); |
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> |
putc(scanline[beg][i], fp); |
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> |
} else |
96 |
> |
cnt = 0; |
97 |
> |
} |
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} |
192 |
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while (rept) { /* write out count */ |
193 |
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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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} |
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return(ferror(fp) ? -1 : 0); |
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} |
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|
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|
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freadcolrs(scanline, len, fp) /* read in a colr scanline */ |
104 |
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register COLR *scanline; |
105 |
< |
int len; |
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< |
register FILE *fp; |
103 |
> |
static int |
104 |
> |
oldreadcolrs( /* read in an old-style colr scanline */ |
105 |
> |
COLR *scanline, |
106 |
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int len, |
107 |
> |
FILE *fp |
108 |
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) |
109 |
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{ |
110 |
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int rshift; |
111 |
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register int i; |
110 |
> |
int rshift = 0; |
111 |
> |
int i; |
112 |
|
|
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rshift = 0; |
212 |
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|
113 |
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while (len > 0) { |
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scanline[0][RED] = getc(fp); |
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scanline[0][GRN] = getc(fp); |
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scanline[0][BLU] = getc(fp); |
117 |
< |
scanline[0][EXP] = getc(fp); |
118 |
< |
if (feof(fp) || ferror(fp)) |
117 |
> |
scanline[0][EXP] = i = getc(fp); |
118 |
> |
if (i == EOF) |
119 |
|
return(-1); |
120 |
< |
if (scanline[0][RED] == 1 && |
121 |
< |
scanline[0][GRN] == 1 && |
122 |
< |
scanline[0][BLU] == 1) { |
123 |
< |
for (i = scanline[0][EXP] << rshift; i > 0; i--) { |
120 |
> |
if (scanline[0][GRN] == 1 && |
121 |
> |
(scanline[0][RED] == 1) & |
122 |
> |
(scanline[0][BLU] == 1)) { |
123 |
> |
i = scanline[0][EXP] << rshift; |
124 |
> |
while (i--) { |
125 |
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copycolr(scanline[0], scanline[-1]); |
126 |
+ |
if (--len <= 0) |
127 |
+ |
return(0); |
128 |
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scanline++; |
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len--; |
129 |
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} |
130 |
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rshift += 8; |
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} else { |
138 |
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} |
139 |
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|
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|
141 |
< |
fwritescan(scanline, len, fp) /* write out a scanline */ |
142 |
< |
register COLOR *scanline; |
143 |
< |
int len; |
144 |
< |
register FILE *fp; |
141 |
> |
int |
142 |
> |
freadcolrs( /* read in an encoded colr scanline */ |
143 |
> |
COLR *scanline, |
144 |
> |
int len, |
145 |
> |
FILE *fp |
146 |
> |
) |
147 |
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{ |
148 |
< |
COLR lastcolr, thiscolr; |
149 |
< |
int rept; |
150 |
< |
|
151 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
152 |
< |
lastcolr[EXP] = 0; |
153 |
< |
rept = 0; |
154 |
< |
|
155 |
< |
while (len > 0) { |
156 |
< |
setcolr(thiscolr, scanline[0][RED], |
148 |
> |
int i, j; |
149 |
> |
int code, val; |
150 |
> |
/* determine scanline type */ |
151 |
> |
if ((len < MINELEN) | (len > MAXELEN)) |
152 |
> |
return(oldreadcolrs(scanline, len, fp)); |
153 |
> |
if ((i = getc(fp)) == EOF) |
154 |
> |
return(-1); |
155 |
> |
if (i != 2) { |
156 |
> |
ungetc(i, fp); |
157 |
> |
return(oldreadcolrs(scanline, len, fp)); |
158 |
> |
} |
159 |
> |
scanline[0][GRN] = getc(fp); |
160 |
> |
scanline[0][BLU] = getc(fp); |
161 |
> |
if ((i = getc(fp)) == EOF) |
162 |
> |
return(-1); |
163 |
> |
if ((scanline[0][GRN] != 2) | ((scanline[0][BLU] & 0x80) != 0)) { |
164 |
> |
scanline[0][RED] = 2; |
165 |
> |
scanline[0][EXP] = i; |
166 |
> |
return(oldreadcolrs(scanline+1, len-1, fp)); |
167 |
> |
} |
168 |
> |
if ((scanline[0][BLU]<<8 | i) != len) |
169 |
> |
return(-1); /* length mismatch! */ |
170 |
> |
/* read each component */ |
171 |
> |
for (i = 0; i < 4; i++) |
172 |
> |
for (j = 0; j < len; ) { |
173 |
> |
if ((code = getc(fp)) == EOF) |
174 |
> |
return(-1); |
175 |
> |
if (code > 128) { /* run */ |
176 |
> |
code &= 127; |
177 |
> |
if ((val = getc(fp)) == EOF) |
178 |
> |
return -1; |
179 |
> |
if (j + code > len) |
180 |
> |
return -1; /* overrun */ |
181 |
> |
while (code--) |
182 |
> |
scanline[j++][i] = val; |
183 |
> |
} else { /* non-run */ |
184 |
> |
if (j + code > len) |
185 |
> |
return -1; /* overrun */ |
186 |
> |
while (code--) { |
187 |
> |
if ((val = getc(fp)) == EOF) |
188 |
> |
return -1; |
189 |
> |
scanline[j++][i] = val; |
190 |
> |
} |
191 |
> |
} |
192 |
> |
} |
193 |
> |
return(0); |
194 |
> |
} |
195 |
> |
|
196 |
> |
|
197 |
> |
int |
198 |
> |
fwritescan( /* write out a scanline */ |
199 |
> |
COLOR *scanline, |
200 |
> |
int len, |
201 |
> |
FILE *fp |
202 |
> |
) |
203 |
> |
{ |
204 |
> |
COLR *clrscan; |
205 |
> |
int n; |
206 |
> |
COLR *sp; |
207 |
> |
/* get scanline buffer */ |
208 |
> |
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
209 |
> |
return(-1); |
210 |
> |
clrscan = sp; |
211 |
> |
/* convert scanline */ |
212 |
> |
n = len; |
213 |
> |
while (n-- > 0) { |
214 |
> |
setcolr(sp[0], scanline[0][RED], |
215 |
|
scanline[0][GRN], |
216 |
|
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 |
– |
} |
217 |
|
scanline++; |
218 |
< |
len--; |
218 |
> |
sp++; |
219 |
|
} |
220 |
< |
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); |
220 |
> |
return(fwritecolrs(clrscan, len, fp)); |
221 |
|
} |
222 |
|
|
223 |
|
|
224 |
< |
freadscan(scanline, len, fp) /* read in a scanline */ |
225 |
< |
register COLOR *scanline; |
226 |
< |
int len; |
227 |
< |
register FILE *fp; |
224 |
> |
int |
225 |
> |
freadscan( /* read in a scanline */ |
226 |
> |
COLOR *scanline, |
227 |
> |
int len, |
228 |
> |
FILE *fp |
229 |
> |
) |
230 |
|
{ |
231 |
< |
COLR thiscolr; |
232 |
< |
int rshift; |
233 |
< |
register int i; |
234 |
< |
|
235 |
< |
rshift = 0; |
236 |
< |
|
237 |
< |
while (len > 0) { |
238 |
< |
thiscolr[RED] = getc(fp); |
239 |
< |
thiscolr[GRN] = getc(fp); |
240 |
< |
thiscolr[BLU] = getc(fp); |
241 |
< |
thiscolr[EXP] = getc(fp); |
242 |
< |
if (feof(fp) || ferror(fp)) |
243 |
< |
return(-1); |
244 |
< |
if (thiscolr[RED] == 1 && |
245 |
< |
thiscolr[GRN] == 1 && |
246 |
< |
thiscolr[BLU] == 1) { |
247 |
< |
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 |
< |
} |
231 |
> |
COLR *clrscan; |
232 |
> |
|
233 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
234 |
> |
return(-1); |
235 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
236 |
> |
return(-1); |
237 |
> |
/* convert scanline */ |
238 |
> |
colr_color(scanline[0], clrscan[0]); |
239 |
> |
while (--len > 0) { |
240 |
> |
scanline++; clrscan++; |
241 |
> |
if (clrscan[0][GRN] == clrscan[-1][GRN] && |
242 |
> |
(clrscan[0][RED] == clrscan[-1][RED]) & |
243 |
> |
(clrscan[0][BLU] == clrscan[-1][BLU]) & |
244 |
> |
(clrscan[0][EXP] == clrscan[-1][EXP])) |
245 |
> |
copycolor(scanline[0], scanline[-1]); |
246 |
> |
else |
247 |
> |
colr_color(scanline[0], clrscan[0]); |
248 |
|
} |
249 |
|
return(0); |
250 |
|
} |
251 |
|
|
252 |
|
|
253 |
< |
setcolr(clr, r, g, b) /* assign a short color value */ |
254 |
< |
register COLR clr; |
255 |
< |
double r, g, b; |
253 |
> |
void |
254 |
> |
setcolr( /* assign a short color value */ |
255 |
> |
COLR clr, |
256 |
> |
double r, |
257 |
> |
double g, |
258 |
> |
double b |
259 |
> |
) |
260 |
|
{ |
331 |
– |
double frexp(); |
261 |
|
double d; |
262 |
|
int e; |
263 |
|
|
272 |
|
|
273 |
|
d = frexp(d, &e) * 256.0 / d; |
274 |
|
|
275 |
< |
clr[RED] = r * d; |
276 |
< |
clr[GRN] = g * d; |
277 |
< |
clr[BLU] = b * d; |
275 |
> |
if (r > 0.0) |
276 |
> |
clr[RED] = r * d; |
277 |
> |
else |
278 |
> |
clr[RED] = 0; |
279 |
> |
if (g > 0.0) |
280 |
> |
clr[GRN] = g * d; |
281 |
> |
else |
282 |
> |
clr[GRN] = 0; |
283 |
> |
if (b > 0.0) |
284 |
> |
clr[BLU] = b * d; |
285 |
> |
else |
286 |
> |
clr[BLU] = 0; |
287 |
> |
|
288 |
|
clr[EXP] = e + COLXS; |
289 |
|
} |
290 |
|
|
291 |
|
|
292 |
< |
colr_color(col, clr) /* convert short to float color */ |
293 |
< |
register COLOR col; |
294 |
< |
register COLR clr; |
292 |
> |
void |
293 |
> |
colr_color( /* convert short to float color */ |
294 |
> |
COLOR col, |
295 |
> |
COLR clr |
296 |
> |
) |
297 |
|
{ |
298 |
|
double f; |
299 |
|
|
308 |
|
} |
309 |
|
|
310 |
|
|
311 |
< |
normcolrs(scan, len) /* normalize a scanline of colrs */ |
312 |
< |
register COLR *scan; |
313 |
< |
int len; |
311 |
> |
int |
312 |
> |
bigdiff( /* c1 delta c2 > md? */ |
313 |
> |
COLOR c1, |
314 |
> |
COLOR c2, |
315 |
> |
double md |
316 |
> |
) |
317 |
|
{ |
318 |
< |
register int c; |
375 |
< |
register int shift; |
318 |
> |
int i; |
319 |
|
|
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 |
– |
|
411 |
– |
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
412 |
– |
register COLOR c1, c2; |
413 |
– |
double md; |
414 |
– |
{ |
415 |
– |
register int i; |
416 |
– |
|
320 |
|
for (i = 0; i < 3; i++) |
321 |
|
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
322 |
< |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
322 |
> |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
323 |
|
return(1); |
324 |
|
return(0); |
325 |
|
} |