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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 "color.h" |
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#include "resolu.h" |
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#define NROWS 1440 /* 10" at 144 dpi */ |
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#define NCOLS 960 /* 8" at 120 dpi */ |
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#define sub_add(sub) (2-(sub)) /* map subtractive to additive pri. */ |
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#ifdef BSD |
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#define clearlbuf() bzero((char *)lpat, sizeof(lpat)) |
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#else |
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#define clearlbuf() (void)memset((char *)lpat, 0, sizeof(lpat)) |
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#endif |
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long lpat[NCOLS][3]; |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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FILE *input; |
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int xres, yres; |
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COLOR scanline[NCOLS]; |
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COLR scanline[NCOLS]; |
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int i; |
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if (fname == NULL) { |
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return(-1); |
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} |
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/* discard header */ |
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getheader(input, NULL); |
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if (checkheader(input, COLRFMT, NULL) < 0) { |
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fprintf(stderr, "%s: not a Radiance picture\n", fname); |
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return(-1); |
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} |
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/* get picture dimensions */ |
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if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) { |
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if (fgetresolu(&xres, &yres, input) < 0) { |
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fprintf(stderr, "%s: bad picture size\n", fname); |
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return(-1); |
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} |
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return(-1); |
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} |
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/* set line spacing (overlap for knitting) */ |
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fputs("\0333\036", stdout); |
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fputs("\0333\042", stdout); |
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/* clear line buffer */ |
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clearlbuf(); |
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/* put out scanlines */ |
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for (i = yres-1; i >= 0; i--) { |
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if (freadscan(scanline, xres, input) < 0) { |
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if (freadcolrs(scanline, xres, input) < 0) { |
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fprintf(stderr, "%s: read error (y=%d)\n", fname, i); |
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return(-1); |
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} |
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normcolrs(scanline, xres, 0); |
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plotscan(scanline, xres, i); |
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} |
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/* advance page */ |
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plotscan(scan, len, y) /* plot a scanline */ |
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COLOR scan[]; |
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COLR scan[]; |
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int len; |
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int y; |
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{ |
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static long pat[NCOLS][3]; |
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int bpos; |
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register long c; |
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register int i, j; |
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if (bpos = y % 20) { |
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if (bpos = y % 23) { |
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if (y > 20 & bpos < 4) /* knit bits */ |
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for (j = 0; j < 3; j++) |
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for (i = 0; i < len; i++) |
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pat[i][j] |= (long)colbit(scan[i],i,j) |
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<< (i+j & 4 ? bpos+24 : bpos); |
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else |
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for (j = 0; j < 3; j++) |
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for (i = 0; i < len; i++) |
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pat[i][j] |= (long)colbit(scan[i],i,j) |
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<< bpos; |
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for (j = 0; j < 3; j++) |
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for (i = 0; i < len; i++) |
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lpat[i][j] |= (long)colbit(scan[i],i,j) << bpos; |
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} else { |
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for (j = 0; j < 3; j++) { |
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fputs("\033%O", stdout); |
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putchar(len & 0xff); |
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putchar(len & 255); |
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putchar(len >> 8); |
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for (i = 0; i < len; i++) { |
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c = pat[i][j]; |
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pat[i][j] = c>>4 & 0xf00000; |
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if (i+j & 4) /* knit last bit */ |
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pat[i][j] |= colbit(scan[i],i,j) << 20; |
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else |
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c |= colbit(scan[i],i,j); |
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putchar(c>>16 & 0xff); |
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putchar(c>>8 & 0xff); |
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putchar(c & 0xff); |
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c = lpat[i][j] | colbit(scan[i],i,j); |
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/* repeat this row */ |
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lpat[i][j] = (c & 1) << 23; |
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putchar(c>>16); |
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putchar(c>>8 & 255); |
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putchar(c & 255); |
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} |
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putchar('\r'); |
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} |
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colbit(col, x, s) /* determine bit value for primary at x */ |
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COLOR col; |
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COLR col; |
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register int x; |
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int s; |
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{ |
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static float cerr[NCOLS][3]; |
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static double err[3]; |
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double b; |
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static int cerr[NCOLS][3]; |
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static int err[3], errp[3]; |
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int b; |
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register int a, ison; |
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a = sub_add(s); /* use additive primary */ |
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b = colval(col,a); |
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if (b > 1.0) b = 1.0; |
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b = col[a]; |
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errp[a] = err[a]; |
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err[a] += b + cerr[x][a]; |
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ison = err[a] < 0.5; |
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if (!ison) err[a] -= 1.0; |
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cerr[x][a] = err[a] *= 0.5; |
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ison = err[a] < 128; |
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if (!ison) err[a] -= 256; |
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err[a] /= 3; |
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cerr[x][a] = err[a] + errp[a]; |
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return(ison); |
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} |
