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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* color.c - routines for color calculations. |
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* |
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* 10/10/85 |
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* Externals declared in color.h |
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*/ |
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#include <stdio.h> |
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#include "copyright.h" |
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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 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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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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#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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|
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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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COLR lastcolr; |
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int rept; |
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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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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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|
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|
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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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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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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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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; |
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register int i; |
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int rshift = 0; |
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int i; |
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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); |
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if (feof(fp) || ferror(fp)) |
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scanline[0][EXP] = i = getc(fp); |
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if (i == EOF) |
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return(-1); |
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if (scanline[0][RED] == 1 && |
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scanline[0][GRN] == 1 && |
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scanline[0][BLU] == 1) { |
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for (i = scanline[0][EXP] << rshift; i > 0; i--) { |
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if (scanline[0][GRN] == 1 && |
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(scanline[0][RED] == 1) & |
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(scanline[0][BLU] == 1)) { |
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i = scanline[0][EXP] << rshift; |
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while (i--) { |
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copycolr(scanline[0], scanline[-1]); |
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if (--len <= 0) |
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return(0); |
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scanline++; |
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len--; |
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} |
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rshift += 8; |
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} else { |
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} |
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|
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|
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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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int |
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freadcolrs( /* read in an encoded 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, 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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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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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] & 0x80) != 0)) { |
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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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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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if ((val = getc(fp)) == EOF) |
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return -1; |
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if (j + code > len) |
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return -1; /* overrun */ |
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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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if (j + code > len) |
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return -1; /* overrun */ |
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while (code--) { |
196 |
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if ((val = getc(fp)) == EOF) |
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return -1; |
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scanline[j++][i] = val; |
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} |
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} |
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} |
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return(0); |
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> |
} |
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|
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|
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int |
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fwritescan( /* write out a scanline */ |
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COLOR *scanline, |
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int len, |
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FILE *fp |
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) |
212 |
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{ |
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COLR *clrscan; |
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int n; |
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COLR *sp; |
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/* get scanline buffer */ |
217 |
> |
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; |
222 |
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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); |
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putc(rept & 255, fp); |
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rept >>= 8; |
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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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} |
229 |
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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); |
144 |
< |
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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|
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|
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freadscan(scanline, len, fp) /* read in a scanline */ |
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register COLOR *scanline; |
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int len; |
236 |
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register FILE *fp; |
233 |
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int |
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freadscan( /* read in a scanline */ |
235 |
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COLOR *scanline, |
236 |
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int len, |
237 |
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FILE *fp |
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) |
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{ |
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COLR thiscolr; |
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int rshift; |
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register int i; |
243 |
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|
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rshift = 0; |
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|
246 |
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while (len > 0) { |
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thiscolr[RED] = getc(fp); |
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thiscolr[GRN] = getc(fp); |
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thiscolr[BLU] = getc(fp); |
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thiscolr[EXP] = getc(fp); |
251 |
< |
if (feof(fp) || ferror(fp)) |
252 |
< |
return(-1); |
253 |
< |
if (thiscolr[RED] == 1 && |
254 |
< |
thiscolr[GRN] == 1 && |
255 |
< |
thiscolr[BLU] == 1) { |
256 |
< |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
173 |
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copycolor(scanline[0], scanline[-1]); |
174 |
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scanline++; |
175 |
< |
len--; |
176 |
< |
} |
177 |
< |
rshift += 8; |
178 |
< |
} else { |
179 |
< |
colr_color(scanline[0], thiscolr); |
180 |
< |
scanline++; |
181 |
< |
len--; |
182 |
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rshift = 0; |
183 |
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} |
240 |
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COLR *clrscan; |
241 |
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|
242 |
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if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
243 |
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return(-1); |
244 |
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if (freadcolrs(clrscan, len, fp) < 0) |
245 |
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return(-1); |
246 |
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/* convert scanline */ |
247 |
> |
colr_color(scanline[0], clrscan[0]); |
248 |
> |
while (--len > 0) { |
249 |
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scanline++; clrscan++; |
250 |
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if (clrscan[0][GRN] == clrscan[-1][GRN] && |
251 |
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(clrscan[0][RED] == clrscan[-1][RED]) & |
252 |
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(clrscan[0][BLU] == clrscan[-1][BLU]) & |
253 |
> |
(clrscan[0][EXP] == clrscan[-1][EXP])) |
254 |
> |
copycolor(scanline[0], scanline[-1]); |
255 |
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else |
256 |
> |
colr_color(scanline[0], clrscan[0]); |
257 |
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} |
258 |
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return(0); |
259 |
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} |
260 |
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|
261 |
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|
262 |
< |
setcolr(clr, r, g, b) /* assign a short color value */ |
263 |
< |
register COLR clr; |
264 |
< |
double r, g, b; |
262 |
> |
void |
263 |
> |
setcolr( /* assign a short color value */ |
264 |
> |
COLR clr, |
265 |
> |
double r, |
266 |
> |
double g, |
267 |
> |
double b |
268 |
> |
) |
269 |
|
{ |
193 |
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double frexp(); |
270 |
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double d; |
271 |
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int e; |
272 |
|
|
281 |
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|
282 |
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d = frexp(d, &e) * 256.0 / d; |
283 |
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|
284 |
< |
clr[RED] = r * d; |
285 |
< |
clr[GRN] = g * d; |
286 |
< |
clr[BLU] = b * d; |
284 |
> |
if (r > 0.0) |
285 |
> |
clr[RED] = r * d; |
286 |
> |
else |
287 |
> |
clr[RED] = 0; |
288 |
> |
if (g > 0.0) |
289 |
> |
clr[GRN] = g * d; |
290 |
> |
else |
291 |
> |
clr[GRN] = 0; |
292 |
> |
if (b > 0.0) |
293 |
> |
clr[BLU] = b * d; |
294 |
> |
else |
295 |
> |
clr[BLU] = 0; |
296 |
> |
|
297 |
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clr[EXP] = e + COLXS; |
298 |
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} |
299 |
|
|
300 |
|
|
301 |
< |
colr_color(col, clr) /* convert short to float color */ |
302 |
< |
register COLOR col; |
303 |
< |
register COLR clr; |
301 |
> |
void |
302 |
> |
colr_color( /* convert short to float color */ |
303 |
> |
COLOR col, |
304 |
> |
COLR clr |
305 |
> |
) |
306 |
|
{ |
307 |
|
double f; |
308 |
|
|
317 |
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} |
318 |
|
|
319 |
|
|
320 |
< |
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
321 |
< |
register COLOR c1, c2; |
322 |
< |
double md; |
320 |
> |
int |
321 |
> |
bigdiff( /* c1 delta c2 > md? */ |
322 |
> |
COLOR c1, |
323 |
> |
COLOR c2, |
324 |
> |
double md |
325 |
> |
) |
326 |
|
{ |
327 |
< |
register int i; |
327 |
> |
int i; |
328 |
|
|
329 |
|
for (i = 0; i < 3; i++) |
330 |
|
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
331 |
< |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
331 |
> |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
332 |
|
return(1); |
333 |
|
return(0); |
334 |
|
} |