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greg |
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/* Copyright (c) 1989 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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#endif |
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/* |
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* paintjet.c - program to dump pixel file to HP PaintJet color printer. |
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* |
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* 10/6/89 |
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*/ |
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#include <stdio.h> |
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#include "color.h" |
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#define NCOLS 1440 /* 8" at 180 dpi */ |
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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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int i, status = 0; |
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if (argc < 2) |
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status = printp(NULL) == -1; |
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else |
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for (i = 1; i < argc; i++) |
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status += printp(argv[i]) == -1; |
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exit(status); |
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} |
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printp(fname) /* print a picture */ |
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char *fname; |
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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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int i; |
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if (fname == NULL) { |
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input = stdin; |
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fname = "<stdin>"; |
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} else if ((input = fopen(fname, "r")) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", fname); |
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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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/* get picture dimensions */ |
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if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) { |
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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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if (xres > NCOLS) { |
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fprintf(stderr, "%s: resolution mismatch\n", fname); |
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return(-1); |
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} |
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/* |
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* Set 180 dpi, 3 planes, left margin and width. |
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*/ |
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printf("\033*t180R\033*r3U\033&a%dH\033*r%dS\033*r1A", |
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((NCOLS-xres)>>4)<<5, xres); |
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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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return(-1); |
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plotscan(scanline, xres, i); |
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} |
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printf("\033*r0B\f"); |
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fclose(input); |
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return(0); |
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} |
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plotscan(scan, len, y) /* plot a scanline */ |
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COLOR scan[]; |
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int len; |
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int y; |
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{ |
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int c; |
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register int x, b; |
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for (c = 0; c < 3; c++) { |
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printf("\033*b%d%c", (len+7)>>3, c<2 ? 'V' : 'W'); |
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b = 0; |
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for (x = 0; x < len; x++) { |
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b = b<<1 | colbit(scan[x], x, c); |
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if ((x&7) == 7) { |
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putc(b, stdout); |
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b = 0; |
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} |
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} |
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if (x & 7) |
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putc(b, stdout); |
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} |
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} |
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colbit(col, x, a) /* determine bit value for primary at x */ |
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COLOR col; |
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register int x; |
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register int a; |
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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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register int ison; |
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b = colval(col,a); |
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if (b > 1.0) b = 1.0; |
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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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return(ison); |
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} |
