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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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|
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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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void * |
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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 void *tempbuf = NULL; |
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static unsigned int 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) { /* call to free */ |
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if (tempbuflen) { |
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free(tempbuf); |
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tempbuf = NULL; |
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tempbuflen = 0; |
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} |
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return(NULL); |
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} |
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if (len <= tempbuflen) /* big enough already? */ |
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return(tempbuf); |
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/* else free & reallocate */ |
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if (tempbuflen) |
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free(tempbuf); |
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tempbuf = malloc(len); |
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tempbuflen = len*(tempbuf != NULL); |
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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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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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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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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 |
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cnt = 0; |
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} |
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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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} |
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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 */ |
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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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* An old-format scanline is either a stream of valid RGBE or XYZE real |
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* pixels or at least one real pixel followed by some number of |
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* invalid real pixels of the form (1,1,1,n), where n is a count. |
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* These can themselves be repeated to create a multibyte repeat |
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* count, with the least significant byte first (little-endian order.) |
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* Repeat counts are limited by the size of an int; if a repetition |
118 |
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* leads to an overrun, the rest of the the repetition will be |
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* silently ignored. |
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*/ |
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static int |
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oldreadcolrs( /* read in an old-style 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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< |
int rshift; |
129 |
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register int i; |
128 |
> |
int rshift = 0; |
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> |
int i; |
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|
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rshift = 0; |
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|
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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); |
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scanline[0][EXP] = getc(fp); |
136 |
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if (feof(fp) || ferror(fp)) |
135 |
> |
scanline[0][EXP] = i = getc(fp); |
136 |
> |
if (i == EOF) |
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return(-1); |
138 |
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if (scanline[0][RED] == 1 && |
139 |
< |
scanline[0][GRN] == 1 && |
140 |
< |
scanline[0][BLU] == 1) { |
141 |
< |
for (i = scanline[0][EXP] << rshift; i > 0; i--) { |
138 |
> |
if (scanline[0][GRN] == 1 && |
139 |
> |
(scanline[0][RED] == 1) & |
140 |
> |
(scanline[0][BLU] == 1)) { |
141 |
> |
i = scanline[0][EXP] << rshift; |
142 |
> |
while (i--) { |
143 |
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copycolr(scanline[0], scanline[-1]); |
144 |
+ |
if (--len <= 0) |
145 |
+ |
return(0); |
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scanline++; |
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len--; |
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} |
148 |
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rshift += 8; |
149 |
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} else { |
155 |
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return(0); |
156 |
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} |
157 |
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|
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/* |
159 |
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* There are two scanline formats: old and new. The old format |
160 |
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* compresses runs of RGBE or XYZE four-byte real pixels; the new |
161 |
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* format breaks the pixels into R, G, B, and E lines (or XYZE lines) |
162 |
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* which are individually run-length encoded. |
163 |
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* |
164 |
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* An old-format scanline always begins with a valid real pixel; at |
165 |
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* least one of the RGB (or XYZ) values will have its high-order bit |
166 |
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* set. A new-format scanline begins with four bytes which are not a |
167 |
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* valid real pixel: (2, 2, lenhigh, lenlow) where lenhigh is always |
168 |
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* less than 128 and hence never has a high-order bit set. |
169 |
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* |
170 |
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* A new-format scanline is broken into its RGBE or XYZE components. |
171 |
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* Each is output and run-length encoded separately so that a scanline |
172 |
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* is broken into four records. In turn, each record is organized |
173 |
+ |
* into chunks of up to 128 characters, which begin with a count byte. |
174 |
+ |
* If the count byte is greater than 128, the following data byte is |
175 |
+ |
* repeated (count-128) times. If not, the count byte is followed by |
176 |
+ |
* that many data bytes. |
177 |
+ |
*/ |
178 |
+ |
int |
179 |
+ |
freadcolrs( /* read in an encoded colr scanline */ |
180 |
+ |
COLR *scanline, |
181 |
+ |
int len, |
182 |
+ |
FILE *fp |
183 |
+ |
) |
184 |
+ |
{ |
185 |
+ |
int i, j; |
186 |
+ |
int code, val; |
187 |
+ |
/* determine scanline type */ |
188 |
+ |
if ((len < MINELEN) | (len > MAXELEN)) |
189 |
+ |
return(oldreadcolrs(scanline, len, fp)); |
190 |
+ |
if ((i = getc(fp)) == EOF) |
191 |
+ |
return(-1); |
192 |
+ |
if (i != 2) { |
193 |
+ |
ungetc(i, fp); |
194 |
+ |
return(oldreadcolrs(scanline, len, fp)); |
195 |
+ |
} |
196 |
+ |
scanline[0][GRN] = getc(fp); |
197 |
+ |
scanline[0][BLU] = getc(fp); |
198 |
+ |
if ((i = getc(fp)) == EOF) |
199 |
+ |
return(-1); |
200 |
+ |
if ((scanline[0][GRN] != 2) | ((scanline[0][BLU] & 0x80) != 0)) { |
201 |
+ |
scanline[0][RED] = 2; |
202 |
+ |
scanline[0][EXP] = i; |
203 |
+ |
return(oldreadcolrs(scanline+1, len-1, fp)); |
204 |
+ |
} |
205 |
+ |
if ((scanline[0][BLU]<<8 | i) != len) |
206 |
+ |
return(-1); /* length mismatch! */ |
207 |
+ |
/* read each component */ |
208 |
+ |
for (i = 0; i < 4; i++) |
209 |
+ |
for (j = 0; j < len; ) { |
210 |
+ |
if ((code = getc(fp)) == EOF) |
211 |
+ |
return(-1); |
212 |
+ |
if (code > 128) { /* run */ |
213 |
+ |
code &= 127; |
214 |
+ |
if ((val = getc(fp)) == EOF) |
215 |
+ |
return -1; |
216 |
+ |
if (j + code > len) |
217 |
+ |
return -1; /* overrun */ |
218 |
+ |
while (code--) |
219 |
+ |
scanline[j++][i] = val; |
220 |
+ |
} else { /* non-run */ |
221 |
+ |
if (j + code > len) |
222 |
+ |
return -1; /* overrun */ |
223 |
+ |
while (code--) { |
224 |
+ |
if ((val = getc(fp)) == EOF) |
225 |
+ |
return -1; |
226 |
+ |
scanline[j++][i] = val; |
227 |
+ |
} |
228 |
+ |
} |
229 |
+ |
} |
230 |
+ |
return(0); |
231 |
+ |
} |
232 |
|
|
233 |
< |
fwritescan(scanline, len, fp) /* write out a scanline */ |
234 |
< |
register COLOR *scanline; |
235 |
< |
int len; |
236 |
< |
register FILE *fp; |
233 |
> |
|
234 |
> |
int |
235 |
> |
fwritescan( /* write out a scanline */ |
236 |
> |
COLOR *scanline, |
237 |
> |
int len, |
238 |
> |
FILE *fp |
239 |
> |
) |
240 |
|
{ |
241 |
< |
COLR lastcolr, thiscolr; |
242 |
< |
int rept; |
243 |
< |
|
244 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
245 |
< |
lastcolr[EXP] = 0; |
246 |
< |
rept = 0; |
247 |
< |
|
248 |
< |
while (len > 0) { |
249 |
< |
setcolr(thiscolr, scanline[0][RED], |
241 |
> |
COLR *clrscan; |
242 |
> |
int n; |
243 |
> |
COLR *sp; |
244 |
> |
/* get scanline buffer */ |
245 |
> |
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
246 |
> |
return(-1); |
247 |
> |
clrscan = sp; |
248 |
> |
/* convert scanline */ |
249 |
> |
n = len; |
250 |
> |
while (n-- > 0) { |
251 |
> |
setcolr(sp[0], scanline[0][RED], |
252 |
|
scanline[0][GRN], |
253 |
|
scanline[0][BLU]); |
209 |
– |
if (thiscolr[EXP] == lastcolr[EXP] && |
210 |
– |
thiscolr[RED] == lastcolr[RED] && |
211 |
– |
thiscolr[GRN] == lastcolr[GRN] && |
212 |
– |
thiscolr[BLU] == lastcolr[BLU]) |
213 |
– |
rept++; |
214 |
– |
else { |
215 |
– |
while (rept) { /* write out count */ |
216 |
– |
putc(1, fp); |
217 |
– |
putc(1, fp); |
218 |
– |
putc(1, fp); |
219 |
– |
putc(rept & 255, fp); |
220 |
– |
rept >>= 8; |
221 |
– |
} |
222 |
– |
putc(thiscolr[RED], fp); /* new color */ |
223 |
– |
putc(thiscolr[GRN], fp); |
224 |
– |
putc(thiscolr[BLU], fp); |
225 |
– |
putc(thiscolr[EXP], fp); |
226 |
– |
copycolr(lastcolr, thiscolr); |
227 |
– |
rept = 0; |
228 |
– |
} |
254 |
|
scanline++; |
255 |
< |
len--; |
255 |
> |
sp++; |
256 |
|
} |
257 |
< |
while (rept) { /* write out count */ |
233 |
< |
putc(1, fp); |
234 |
< |
putc(1, fp); |
235 |
< |
putc(1, fp); |
236 |
< |
putc(rept & 255, fp); |
237 |
< |
rept >>= 8; |
238 |
< |
} |
239 |
< |
return(ferror(fp) ? -1 : 0); |
257 |
> |
return(fwritecolrs(clrscan, len, fp)); |
258 |
|
} |
259 |
|
|
260 |
|
|
261 |
< |
freadscan(scanline, len, fp) /* read in a scanline */ |
262 |
< |
register COLOR *scanline; |
263 |
< |
int len; |
264 |
< |
register FILE *fp; |
261 |
> |
int |
262 |
> |
freadscan( /* read in a scanline */ |
263 |
> |
COLOR *scanline, |
264 |
> |
int len, |
265 |
> |
FILE *fp |
266 |
> |
) |
267 |
|
{ |
268 |
< |
COLR thiscolr; |
269 |
< |
int rshift; |
270 |
< |
register int i; |
271 |
< |
|
272 |
< |
rshift = 0; |
273 |
< |
|
274 |
< |
while (len > 0) { |
275 |
< |
thiscolr[RED] = getc(fp); |
276 |
< |
thiscolr[GRN] = getc(fp); |
277 |
< |
thiscolr[BLU] = getc(fp); |
278 |
< |
thiscolr[EXP] = getc(fp); |
279 |
< |
if (feof(fp) || ferror(fp)) |
280 |
< |
return(-1); |
281 |
< |
if (thiscolr[RED] == 1 && |
282 |
< |
thiscolr[GRN] == 1 && |
283 |
< |
thiscolr[BLU] == 1) { |
284 |
< |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
265 |
< |
copycolor(scanline[0], scanline[-1]); |
266 |
< |
scanline++; |
267 |
< |
len--; |
268 |
< |
} |
269 |
< |
rshift += 8; |
270 |
< |
} else { |
271 |
< |
colr_color(scanline[0], thiscolr); |
272 |
< |
scanline++; |
273 |
< |
len--; |
274 |
< |
rshift = 0; |
275 |
< |
} |
268 |
> |
COLR *clrscan; |
269 |
> |
|
270 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
271 |
> |
return(-1); |
272 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
273 |
> |
return(-1); |
274 |
> |
/* convert scanline */ |
275 |
> |
colr_color(scanline[0], clrscan[0]); |
276 |
> |
while (--len > 0) { |
277 |
> |
scanline++; clrscan++; |
278 |
> |
if (clrscan[0][GRN] == clrscan[-1][GRN] && |
279 |
> |
(clrscan[0][RED] == clrscan[-1][RED]) & |
280 |
> |
(clrscan[0][BLU] == clrscan[-1][BLU]) & |
281 |
> |
(clrscan[0][EXP] == clrscan[-1][EXP])) |
282 |
> |
copycolor(scanline[0], scanline[-1]); |
283 |
> |
else |
284 |
> |
colr_color(scanline[0], clrscan[0]); |
285 |
|
} |
286 |
|
return(0); |
287 |
|
} |
288 |
|
|
289 |
|
|
290 |
< |
setcolr(clr, r, g, b) /* assign a short color value */ |
291 |
< |
register COLR clr; |
292 |
< |
double r, g, b; |
290 |
> |
void |
291 |
> |
setcolr( /* assign a short color value */ |
292 |
> |
COLR clr, |
293 |
> |
double r, |
294 |
> |
double g, |
295 |
> |
double b |
296 |
> |
) |
297 |
|
{ |
285 |
– |
double frexp(); |
298 |
|
double d; |
299 |
|
int e; |
300 |
|
|
301 |
|
d = r > g ? r : g; |
302 |
|
if (b > d) d = b; |
303 |
|
|
304 |
< |
if (d <= 0.0) { |
304 |
> |
if (d <= 1e-32) { |
305 |
|
clr[RED] = clr[GRN] = clr[BLU] = 0; |
306 |
|
clr[EXP] = 0; |
307 |
|
return; |
309 |
|
|
310 |
|
d = frexp(d, &e) * 256.0 / d; |
311 |
|
|
312 |
< |
clr[RED] = r * d; |
313 |
< |
clr[GRN] = g * d; |
314 |
< |
clr[BLU] = b * d; |
312 |
> |
if (r > 0.0) |
313 |
> |
clr[RED] = r * d; |
314 |
> |
else |
315 |
> |
clr[RED] = 0; |
316 |
> |
if (g > 0.0) |
317 |
> |
clr[GRN] = g * d; |
318 |
> |
else |
319 |
> |
clr[GRN] = 0; |
320 |
> |
if (b > 0.0) |
321 |
> |
clr[BLU] = b * d; |
322 |
> |
else |
323 |
> |
clr[BLU] = 0; |
324 |
> |
|
325 |
|
clr[EXP] = e + COLXS; |
326 |
|
} |
327 |
|
|
328 |
|
|
329 |
< |
colr_color(col, clr) /* convert short to float color */ |
330 |
< |
register COLOR col; |
331 |
< |
register COLR clr; |
329 |
> |
void |
330 |
> |
colr_color( /* convert short to float color */ |
331 |
> |
COLOR col, |
332 |
> |
COLR clr |
333 |
> |
) |
334 |
|
{ |
335 |
< |
double ldexp(), f; |
335 |
> |
double f; |
336 |
|
|
337 |
|
if (clr[EXP] == 0) |
338 |
|
col[RED] = col[GRN] = col[BLU] = 0.0; |
342 |
|
col[GRN] = (clr[GRN] + 0.5)*f; |
343 |
|
col[BLU] = (clr[BLU] + 0.5)*f; |
344 |
|
} |
345 |
+ |
} |
346 |
+ |
|
347 |
+ |
|
348 |
+ |
int |
349 |
+ |
bigdiff( /* c1 delta c2 > md? */ |
350 |
+ |
COLOR c1, |
351 |
+ |
COLOR c2, |
352 |
+ |
double md |
353 |
+ |
) |
354 |
+ |
{ |
355 |
+ |
int i; |
356 |
+ |
|
357 |
+ |
for (i = 0; i < 3; i++) |
358 |
+ |
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
359 |
+ |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
360 |
+ |
return(1); |
361 |
+ |
return(0); |
362 |
|
} |