Stars of Shareware: Raytrace & Morphing/SOS-RAYTRACE.ISO/programm/source/radsrc22/src/px/oki20c.c

C/C++ Source or Header | 1992-09-19 | 4.2 KB | 194 lines

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "@(#)oki20c.c 2.8 7/3/92 LBL";
#endif

/*
 *  oki20c.c - program to dump pixel file to OkiMate 20 color printer.
 */

#include  <stdio.h>
#ifdef MSDOS
#include  <fcntl.h>
#endif

#include  "color.h"
#include  "resolu.h"

#define  NROWS          1440            /* 10" at 144 dpi */
#define  NCOLS          960             /* 8" at 120 dpi */

#define  ASPECT         (120./144.)     /* pixel aspect ratio */

#define  FILTER         "pfilt -1 -x %d -y %d -p %f %s",NCOLS,NROWS,ASPECT

/*
 *  Subtractive primaries are ordered:  Yellow, Magenta, Cyan.
 */

#define  sub_add(sub)   (2-(sub))       /* map subtractive to additive pri. */

long  lpat[NCOLS][3];

int  dofilter = 0;              /* filter through pfilt first? */

extern FILE  *popen();


main(argc, argv)
int  argc;
char  *argv[];
{
    int  i, status = 0;
#ifdef MSDOS
    extern int  _fmode;
    _fmode = O_BINARY;
    setmode(fileno(stdin), O_BINARY);
    setmode(fileno(stdout), O_BINARY);
#endif
    if (argc > 1 && !strcmp(argv[1], "-p")) {
        dofilter++;
        argv++; argc--;
    }
#ifdef _IOLBF
    stdout->_flag &= ~_IOLBF;
#endif
    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;
{
    char  buf[64];
    FILE  *input;
    int  xres, yres;
    COLR  scanline[NCOLS];
    int  i;

    if (dofilter) {
        if (fname == NULL) {
            sprintf(buf, FILTER, "");
            fname = "<stdin>";
        } else
            sprintf(buf, FILTER, fname);
        if ((input = popen(buf, "r")) == NULL) {
            fprintf(stderr, "Cannot execute: %s\n", buf);
            return(-1);
        }
    } else 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) < 0) {
        fprintf(stderr, "%s: bad picture size\n", fname);
        return(-1);
    }
    if (xres > NCOLS) {
        fprintf(stderr, "%s: resolution mismatch\n", fname);
        return(-1);
    }
                /* set line spacing (overlap for knitting) */
    fputs("\0333\042", stdout);
                /* put out scanlines */
    for (i = yres-1; i >= 0; i--) {
        if (freadcolrs(scanline, xres, input) < 0) {
            fprintf(stderr, "%s: read error (y=%d)\n", fname, i);
            return(-1);
        }
        normcolrs(scanline, xres, 0);
        plotscan(scanline, xres, i);
    }
                /* advance page */
    putchar('\f');

    if (dofilter)
        pclose(input);
    else
        fclose(input);

    return(0);
}


plotscan(scan, len, y)                  /* plot a scanline */
COLR  scan[];
int  len;
int  y;
{
    int  bpos;
    register long  c;
    register int  i, j;

    if (bpos = y % 23) {

        for (j = 0; j < 3; j++)
            for (i = 0; i < len; i++)
                lpat[i][j] |= (long)colbit(scan[i],i,j) << bpos;
        return;
    }
    fputs("\033\031", stdout);

    for (j = 0; j < 3; j++) {
        i = (NCOLS + len)/2;            /* center image */
        fputs("\033%O", stdout);
        putchar(i & 255);
        putchar(i >> 8);
        while (i-- > len) {
            putchar(0);
            putchar(0);
            putchar(0);
        }
        for (i = 0; i < len; i++) {
            c = lpat[i][j] | colbit(scan[i],i,j);
            putchar((int)(c>>16));
            putchar((int)(c>>8 & 255));
            putchar((int)(c & 255));
            if (y)                  /* repeat this row */
                lpat[i][j] = (c & 1) << 23;
            else                    /* or clear for next image */
                lpat[i][j] = 0L;
        }
        putchar('\r');
    }
    putchar('\n');
    fflush(stdout);
}


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

    a = sub_add(s);                 /* use additive primary */
    b = col[a];
    errp = 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;
    return(ison);
}