getfb.c

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/* 
 * getfb.c - Display Extended Run Length Encoding with Alpha1 channel
 *      on BRL libfb frame buffer.
 * 
 * Author:  Paul R. Stay
 *      Ballistic Research Labratory
 *      Aberdeen Proving Ground, Md.
 * Date:    Mon Jun 23 1986
 */

#include <stdio.h>
#include <brlcad/fb.h>
#include "rle.h"

#define MAX_PIXELS   1024

main( argc, argv)
int argc;
char ** argv;
{
        rle_hdr hdr;
    FILE *rle_fd;
    FBIO *fbp;
    int r_debug;
    char * rle_file;
    register int i,j;

    unsigned char scanline[4][MAX_PIXELS];  /* Run length scan line */
    unsigned char *rows[4];     /* Character pointers for rle_getrow */

    RGBpixel pix[MAX_PIXELS];       /* pixel structure */
    int x_len, y_len;

    hdr = *rle_hdr_init( (rle_hdr *)NULL );
    rle_names( &hdr, cmd_name( argv ), NULL, 0 );
    argc--; argv++;
    while( argv[0][0] == '-')  {

        switch( argv[0][1] )  {
        case 'D':
            r_debug = 1;
            break;
        default:
            break;
        }
        argc--; argv++;
    }

    rle_file = argv[0];
    rle_names( &hdr, hdr.cmd, rle_file );
        hdr.rle_file = rle_open_f(hdr.cmd, rle_file, "r");
    if( rle_get_setup( &hdr ) < 0 )  {
        fprintf(stderr, "getfb: Error reading setup information\n");
        exit(1);
    }

    if (r_debug)
    {
        fprintf( stderr,"Image bounds\n\tmin %d %d\n\tmax %d %d\n",
            hdr.xmin, hdr.ymin,
            hdr.xmax, hdr.ymax );
        if ( hdr.alpha )
            fprintf( stderr, "Alpha Channel present\n");
        rle_debug(1);
    }

    /* We`re only interested in R, G, & B */
    RLE_CLR_BIT(hdr, RLE_ALPHA);
    for (i = 3; i < hdr.ncolors; i++)
        RLE_CLR_BIT(hdr, i);

    x_len = hdr.xmax - hdr.xmin + 1;
    y_len = hdr.ymax - hdr.ymin + 1;

    if( (fbp = fb_open( "", hdr.xmax+1, hdr.ymax+1 )) == NULL )
        exit(12);

    for ( i = hdr.ymin; i <= hdr.ymax; i++)  {
        rows[0] = (unsigned char *)-1;
        rows[1] = scanline[1];
        rows[2] = scanline[2];
        rows[3] = scanline[3];
        rle_getrow(&hdr, &rows[1] );

        for ( j = 0; j < x_len; j++)
        {
            pix[j][RED] = scanline[1][j];
            pix[j][GRN] = scanline[2][j];
            pix[j][BLU] = scanline[3][j];
        }
        fb_write( fbp, hdr.xmin, i, pix, x_len );
    }
    exit(0);
}