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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1991 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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#include <stdio.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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#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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#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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|
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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(len) /* get a temporary buffer */ |
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unsigned len; |
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{ |
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COLOR ciecolor; |
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extern char *malloc(), *realloc(); |
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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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if (len > tempbuflen) { |
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if (tempbuflen > 0) |
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tempbuf = realloc(tempbuf, len); |
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else |
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tempbuf = 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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|
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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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fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
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register COLR *scanline; |
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unsigned len; |
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register FILE *fp; |
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{ |
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register int i, d, r; |
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register int i, j, beg, cnt; |
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int c2; |
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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 < 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) { |
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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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} |
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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 |
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cnt = 0; |
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} |
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} |
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return(ferror(fp) ? -1 : 0); |
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} |
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#endif |
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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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fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
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freadcolrs(scanline, len, fp) /* read in an encoded 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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|
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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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} |
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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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register int i, j; |
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int code, val; |
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/* determine scanline type */ |
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if (len < MINELEN | len > MAXELEN) |
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return(oldreadcolrs(scanline, len, fp)); |
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if ((i = getc(fp)) == EOF) |
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return(-1); |
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if (i != 2) { |
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ungetc(i, fp); |
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return(oldreadcolrs(scanline, len, fp)); |
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} |
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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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scanline[0][GRN] = getc(fp); |
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scanline[0][BLU] = getc(fp); |
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if ((i = getc(fp)) == EOF) |
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return(-1); |
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if (scanline[0][GRN] != 2 || scanline[0][BLU] & 128) { |
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scanline[0][RED] = 2; |
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scanline[0][EXP] = i; |
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return(oldreadcolrs(scanline+1, len-1, fp)); |
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} |
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return(ferror(fp) ? -1 : 0); |
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if ((scanline[0][BLU]<<8 | i) != len) |
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return(-1); /* length mismatch! */ |
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/* read each component */ |
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for (i = 0; i < 4; i++) |
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for (j = 0; j < len; ) { |
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if ((code = getc(fp)) == EOF) |
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return(-1); |
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if (code > 128) { /* run */ |
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code &= 127; |
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val = getc(fp); |
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while (code--) |
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scanline[j++][i] = val; |
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} else /* non-run */ |
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while (code--) |
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scanline[j++][i] = getc(fp); |
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} |
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return(feof(fp) ? -1 : 0); |
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} |
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freadcolrs(scanline, len, fp) /* read in a colr scanline */ |
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oldreadcolrs(scanline, len, fp) /* read in an old 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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fwritescan(scanline, len, fp) /* write out a scanline */ |
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register COLOR *scanline; |
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int len; |
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register FILE *fp; |
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FILE *fp; |
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{ |
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COLR lastcolr, thiscolr; |
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int rept; |
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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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setcolr(thiscolr, scanline[0][RED], |
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COLR *clrscan; |
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int n; |
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register COLR *sp; |
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/* get scanline buffer */ |
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if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
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return(-1); |
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clrscan = sp; |
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/* convert scanline */ |
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n = len; |
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while (n-- > 0) { |
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setcolr(sp[0], scanline[0][RED], |
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scanline[0][GRN], |
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scanline[0][BLU]); |
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if (thiscolr[EXP] == lastcolr[EXP] && |
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thiscolr[RED] == lastcolr[RED] && |
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thiscolr[GRN] == lastcolr[GRN] && |
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thiscolr[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); |
265 |
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putc(rept & 255, fp); |
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rept >>= 8; |
267 |
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} |
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putc(thiscolr[RED], fp); /* new color */ |
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putc(thiscolr[GRN], fp); |
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putc(thiscolr[BLU], fp); |
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putc(thiscolr[EXP], fp); |
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copycolr(lastcolr, thiscolr); |
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rept = 0; |
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} |
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scanline++; |
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len--; |
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sp++; |
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} |
197 |
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while (rept) { /* write out count */ |
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putc(1, fp); |
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putc(1, fp); |
281 |
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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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> |
return(fwritecolrs(clrscan, len, fp)); |
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} |
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|
200 |
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|
201 |
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freadscan(scanline, len, fp) /* read in a scanline */ |
202 |
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register COLOR *scanline; |
203 |
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int len; |
204 |
< |
register FILE *fp; |
204 |
> |
FILE *fp; |
205 |
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{ |
206 |
< |
COLR thiscolr; |
207 |
< |
int rshift; |
208 |
< |
register int i; |
209 |
< |
|
210 |
< |
rshift = 0; |
211 |
< |
|
212 |
< |
while (len > 0) { |
213 |
< |
thiscolr[RED] = getc(fp); |
214 |
< |
thiscolr[GRN] = getc(fp); |
215 |
< |
thiscolr[BLU] = getc(fp); |
216 |
< |
thiscolr[EXP] = getc(fp); |
217 |
< |
if (feof(fp) || ferror(fp)) |
218 |
< |
return(-1); |
219 |
< |
if (thiscolr[RED] == 1 && |
220 |
< |
thiscolr[GRN] == 1 && |
221 |
< |
thiscolr[BLU] == 1) { |
222 |
< |
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 |
< |
} |
206 |
> |
register COLR *clrscan; |
207 |
> |
|
208 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
209 |
> |
return(-1); |
210 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
211 |
> |
return(-1); |
212 |
> |
/* convert scanline */ |
213 |
> |
colr_color(scanline[0], clrscan[0]); |
214 |
> |
while (--len > 0) { |
215 |
> |
scanline++; clrscan++; |
216 |
> |
if (clrscan[0][RED] == clrscan[-1][RED] && |
217 |
> |
clrscan[0][GRN] == clrscan[-1][GRN] && |
218 |
> |
clrscan[0][BLU] == clrscan[-1][BLU] && |
219 |
> |
clrscan[0][EXP] == clrscan[-1][EXP]) |
220 |
> |
copycolor(scanline[0], scanline[-1]); |
221 |
> |
else |
222 |
> |
colr_color(scanline[0], clrscan[0]); |
223 |
|
} |
224 |
|
return(0); |
225 |
|
} |
229 |
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register COLR clr; |
230 |
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double r, g, b; |
231 |
|
{ |
331 |
– |
double frexp(); |
232 |
|
double d; |
233 |
|
int e; |
234 |
|
|
264 |
|
col[GRN] = (clr[GRN] + 0.5)*f; |
265 |
|
col[BLU] = (clr[BLU] + 0.5)*f; |
266 |
|
} |
367 |
– |
} |
368 |
– |
|
369 |
– |
|
370 |
– |
int |
371 |
– |
colr_norm(clr, nclr) /* normalize a short color, return shift */ |
372 |
– |
COLR clr, nclr; |
373 |
– |
{ |
374 |
– |
register int c; |
375 |
– |
register int shift = clr[EXP]-COLXS; |
376 |
– |
|
377 |
– |
if (shift > 0) { |
378 |
– |
if (shift >= 8) { |
379 |
– |
nclr[RED] = nclr[GRN] = nclr[BLU] = 255; |
380 |
– |
} else { |
381 |
– |
c = clr[RED] << shift; |
382 |
– |
nclr[RED] = c > 255 ? 255 : c; |
383 |
– |
c = clr[GRN] << shift; |
384 |
– |
nclr[GRN] = c > 255 ? 255 : c; |
385 |
– |
c = clr[BLU] << shift; |
386 |
– |
nclr[BLU] = c > 255 ? 255 : c; |
387 |
– |
} |
388 |
– |
} else if (shift < 0) { |
389 |
– |
if (shift <= -8) { |
390 |
– |
nclr[RED] = nclr[GRN] = nclr[BLU] = 0; |
391 |
– |
} else { |
392 |
– |
nclr[RED] = clr[RED] >> -shift; |
393 |
– |
nclr[GRN] = clr[GRN] >> -shift; |
394 |
– |
nclr[BLU] = clr[BLU] >> -shift; |
395 |
– |
} |
396 |
– |
} else { |
397 |
– |
nclr[RED] = clr[RED]; |
398 |
– |
nclr[GRN] = clr[GRN]; |
399 |
– |
nclr[BLU] = clr[BLU]; |
400 |
– |
} |
401 |
– |
nclr[EXP] = COLXS; |
402 |
– |
return(shift); |
267 |
|
} |
268 |
|
|
269 |
|
|