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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* color.c - routines for color calculations. |
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* |
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* 10/10/85 |
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* Externals declared in color.h |
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*/ |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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|
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#include <math.h> |
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|
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#include "color.h" |
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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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|
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char * |
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tempbuffer(len) /* get a temporary buffer */ |
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unsigned int len; |
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{ |
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static char *tempbuf = NULL; |
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static unsigned tempbuflen = 0; |
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|
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if (len > tempbuflen) { |
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if (tempbuflen > 0) |
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tempbuf = (char *)realloc(tempbuf, len); |
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else |
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tempbuf = (char *)malloc(len); |
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tempbuflen = tempbuf==NULL ? 0 : len; |
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} |
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return(tempbuf); |
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} |
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|
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|
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int |
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fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
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register COLR *scanline; |
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int len; |
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register FILE *fp; |
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{ |
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COLR lastcolr; |
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int rept; |
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register int i, j, beg, cnt = 1; |
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int c2; |
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|
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lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
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lastcolr[EXP] = 0; |
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rept = 0; |
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|
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while (len > 0) { |
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if (scanline[0][EXP] == lastcolr[EXP] && |
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scanline[0][RED] == lastcolr[RED] && |
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scanline[0][GRN] == lastcolr[GRN] && |
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scanline[0][BLU] == lastcolr[BLU]) |
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rept++; |
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else { |
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while (rept) { /* write out count */ |
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putc(1, fp); |
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putc(1, fp); |
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putc(1, fp); |
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putc(rept & 255, fp); |
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rept >>= 8; |
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if (len < MINELEN | len > MAXELEN) /* OOBs, write out flat */ |
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return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len); |
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/* put magic header */ |
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putc(2, fp); |
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putc(2, fp); |
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putc(len>>8, fp); |
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putc(len&255, fp); |
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/* put components seperately */ |
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for (i = 0; i < 4; i++) { |
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for (j = 0; j < len; j += cnt) { /* find next run */ |
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for (beg = j; beg < len; beg += cnt) { |
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for (cnt = 1; cnt < 127 && beg+cnt < len && |
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scanline[beg+cnt][i] == scanline[beg][i]; cnt++) |
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; |
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if (cnt >= MINRUN) |
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break; /* long enough */ |
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} |
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if (beg-j > 1 && beg-j < MINRUN) { |
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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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static int |
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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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} |
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|
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int |
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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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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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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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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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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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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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return(0); |
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} |
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|
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|
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int |
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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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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); |
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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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} |
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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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return(fwritecolrs(clrscan, len, fp)); |
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} |
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int |
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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; |
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register FILE *fp; |
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FILE *fp; |
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COLR thiscolr; |
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int rshift; |
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register 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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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); |
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if (feof(fp) || ferror(fp)) |
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return(-1); |
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if (thiscolr[RED] == 1 && |
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thiscolr[GRN] == 1 && |
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thiscolr[BLU] == 1) { |
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for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
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copycolor(scanline[0], scanline[-1]); |
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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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colr_color(scanline[0], thiscolr); |
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scanline++; |
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len--; |
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rshift = 0; |
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} |
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register COLR *clrscan; |
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|
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if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
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return(-1); |
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if (freadcolrs(clrscan, len, fp) < 0) |
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return(-1); |
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/* convert scanline */ |
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colr_color(scanline[0], clrscan[0]); |
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while (--len > 0) { |
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scanline++; clrscan++; |
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if (clrscan[0][RED] == clrscan[-1][RED] && |
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clrscan[0][GRN] == clrscan[-1][GRN] && |
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clrscan[0][BLU] == clrscan[-1][BLU] && |
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clrscan[0][EXP] == clrscan[-1][EXP]) |
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copycolor(scanline[0], scanline[-1]); |
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else |
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colr_color(scanline[0], clrscan[0]); |
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} |
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return(0); |
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} |
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void |
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setcolr(clr, r, g, b) /* assign a short color value */ |
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register COLR clr; |
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double r, g, b; |
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{ |
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double frexp(); |
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double d; |
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int e; |
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return; |
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} |
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d = frexp(d, &e) * 256.0 / d; |
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d = frexp(d, &e) * 255.9999 / d; |
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clr[RED] = r * d; |
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clr[GRN] = g * d; |
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} |
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void |
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colr_color(col, clr) /* convert short to float color */ |
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register COLOR col; |
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register COLR clr; |
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} |
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normcolrs(scan, len, adjust) /* normalize a scanline of colrs */ |
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register COLR *scan; |
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int len; |
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int adjust; |
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{ |
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register int c; |
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register int shift; |
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|
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while (len-- > 0) { |
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shift = scan[0][EXP] + adjust - COLXS; |
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if (shift > 0) { |
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if (shift > 8) { |
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scan[0][RED] = |
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scan[0][GRN] = |
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scan[0][BLU] = 255; |
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} else { |
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shift--; |
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c = (scan[0][RED]<<1 | 1) << shift; |
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scan[0][RED] = c > 255 ? 255 : c; |
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c = (scan[0][GRN]<<1 | 1) << shift; |
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scan[0][GRN] = c > 255 ? 255 : c; |
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c = (scan[0][BLU]<<1 | 1) << shift; |
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scan[0][BLU] = c > 255 ? 255 : c; |
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} |
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} else if (shift < 0) { |
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if (shift < -8) { |
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scan[0][RED] = |
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scan[0][GRN] = |
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scan[0][BLU] = 0; |
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} else { |
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shift = -1-shift; |
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scan[0][RED] = ((scan[0][RED]>>shift)+1)>>1; |
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scan[0][GRN] = ((scan[0][GRN]>>shift)+1)>>1; |
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scan[0][BLU] = ((scan[0][BLU]>>shift)+1)>>1; |
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} |
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} |
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scan[0][EXP] = COLXS - adjust; |
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scan++; |
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} |
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} |
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|
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|
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int |
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bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
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register COLOR c1, c2; |
284 |
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double md; |