src/px/paintjet.c

/* Copyright (c) 1989 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  paintjet.c - program to dump pixel file to HP PaintJet color printer.
 *
 *     10/6/89
 */

#include  <stdio.h>

#include  "color.h"

#define  NCOLS          1440            /* 8" at 180 dpi */


main(argc, argv)
int  argc;
char  *argv[];
{
        int  i, status = 0;
        
        if (argc < 2)
                status = printp(NULL) == -1;
        else
                for (i = 1; i < argc; i++)
                        status += printp(argv[i]) == -1;
        exit(status);
}


printp(fname)                           /* print a picture */
char  *fname;
{
        FILE  *input;
        int  xres, yres;
        COLR  scanline[NCOLS];
        int  i;

        if (fname == NULL) {
                input = stdin;
                fname = "<stdin>";
        } else if ((input = fopen(fname, "r")) == NULL) {
                fprintf(stderr, "%s: cannot open\n", fname);
                return(-1);
        }
                                /* discard header */
        if (checkheader(input, COLRFMT, NULL) < 0) {
                fprintf(stderr, "%s: not a Radiance picture\n", fname);
                return(-1);
        }
                                /* get picture dimensions */
        if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) {
                fprintf(stderr, "%s: bad picture size\n", fname);
                return(-1);
        }
        if (xres > NCOLS) {
                fprintf(stderr, "%s: resolution mismatch\n", fname);
                return(-1);
        }
        /*
         * Set 180 dpi, 3 planes, left margin and width.
         */
        printf("\033*t180R\033*r3U\033&a%dH\033*r%dS\033*r1A",
                        ((NCOLS-xres)>>4)<<5, xres);
        
        for (i = yres-1; i >= 0; i--) {
                if (freadcolrs(scanline, xres, input) < 0)
                        return(-1);
                normcolrs(scanline, xres, 0);
                plotscan(scanline, xres, i);
        }

        printf("\033*r0B\f");
        
        fclose(input);

        return(0);
}


plotscan(scan, len, y)                  /* plot a scanline */
COLR  scan[];
int  len;
int  y;
{
        int  c;
        register int  x, b;

        for (c = 0; c < 3; c++) {
                printf("\033*b%d%c", (len+7)>>3, c<2 ? 'V' : 'W');
                b = 0;
                for (x = 0; x < len; x++) {
                        b = b<<1 | colbit(scan[x], x, c);
                        if ((x&7) == 7) {
                                putc(b, stdout);
                                b = 0;
                        }
                }
                if (x & 7)
                        putc(b, stdout);
        }
}


colbit(col, x, a)               /* determine bit value for primary at x */
COLR  col;
register int  x;
register int  a;
{
        static int  cerr[NCOLS][3];
        static int  err[3], errp[3];
        int  b;
        register int  ison;

        b = col[a];
        errp[a] = err[a];
        err[a] += b + cerr[x][a];
        ison = err[a] > 128;
        if (ison) err[a] -= 256;
        err[a] /= 3;
        cerr[x][a] = err[a] + errp[a];
        return(ison);
}
Revision:	1.6
Committed:	Mon May 6 13:14:26 1991 UTC (34 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+4 -2 lines
Log Message:	improved dithering slightly
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1989 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* paintjet.c - program to dump pixel file to HP PaintJet color printer.
9			*
10			* 10/6/89
11			*/
12
13			#include <stdio.h>
14
15			#include "color.h"
16
17			#define NCOLS 1440 /* 8" at 180 dpi */
18
19
20			main(argc, argv)
21			int argc;
22			char *argv[];
23			{
24			int i, status = 0;
25
26			if (argc < 2)
27			status = printp(NULL) == -1;
28			else
29			for (i = 1; i < argc; i++)
30			status += printp(argv[i]) == -1;
31			exit(status);
32			}
33
34
35			printp(fname) /* print a picture */
36			char *fname;
37			{
38			FILE *input;
39			int xres, yres;
40	greg	1.2	COLR scanline[NCOLS];
41	greg	1.1	int i;
42
43			if (fname == NULL) {
44			input = stdin;
45			fname = "<stdin>";
46			} else if ((input = fopen(fname, "r")) == NULL) {
47			fprintf(stderr, "%s: cannot open\n", fname);
48			return(-1);
49			}
50			/* discard header */
51	greg	1.5	if (checkheader(input, COLRFMT, NULL) < 0) {
52			fprintf(stderr, "%s: not a Radiance picture\n", fname);
53			return(-1);
54			}
55	greg	1.1	/* get picture dimensions */
56			if (fgetresolu(&xres, &yres, input) != (YMAJOR\|YDECR)) {
57			fprintf(stderr, "%s: bad picture size\n", fname);
58			return(-1);
59			}
60			if (xres > NCOLS) {
61			fprintf(stderr, "%s: resolution mismatch\n", fname);
62			return(-1);
63			}
64			/*
65			* Set 180 dpi, 3 planes, left margin and width.
66			*/
67			printf("\033t180R\033r3U\033&a%dH\033r%dS\033r1A",
68			((NCOLS-xres)>>4)<<5, xres);
69
70			for (i = yres-1; i >= 0; i--) {
71	greg	1.2	if (freadcolrs(scanline, xres, input) < 0)
72	greg	1.1	return(-1);
73	greg	1.4	normcolrs(scanline, xres, 0);
74	greg	1.1	plotscan(scanline, xres, i);
75			}
76
77			printf("\033*r0B\f");
78
79			fclose(input);
80
81			return(0);
82	greg	1.2	}
83
84
85	greg	1.1	plotscan(scan, len, y) /* plot a scanline */
86	greg	1.2	COLR scan[];
87	greg	1.1	int len;
88			int y;
89			{
90			int c;
91			register int x, b;
92
93			for (c = 0; c < 3; c++) {
94			printf("\033*b%d%c", (len+7)>>3, c<2 ? 'V' : 'W');
95			b = 0;
96			for (x = 0; x < len; x++) {
97			b = b<<1 \| colbit(scan[x], x, c);
98			if ((x&7) == 7) {
99			putc(b, stdout);
100			b = 0;
101			}
102			}
103			if (x & 7)
104			putc(b, stdout);
105			}
106			}
107
108
109			colbit(col, x, a) /* determine bit value for primary at x */
110	greg	1.2	COLR col;
111	greg	1.1	register int x;
112			register int a;
113			{
114	greg	1.2	static int cerr[NCOLS][3];
115	greg	1.6	static int err[3], errp[3];
116	greg	1.2	int b;
117	greg	1.1	register int ison;
118
119	greg	1.2	b = col[a];
120	greg	1.6	errp[a] = err[a];
121	greg	1.1	err[a] += b + cerr[x][a];
122	greg	1.2	ison = err[a] > 128;
123			if (ison) err[a] -= 256;
124	greg	1.6	err[a] /= 3;
125			cerr[x][a] = err[a] + errp[a];
126	greg	1.1	return(ison);
127			}