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/* neotoppm.c - read a Neochrome NEO file and produce a portable pixmap
**
** Copyright (C) 2001 by Teemu Hukkanen <tjhukkan@iki.fi>
** Based on pi1toppm by Steve Belczyk (seb3@gte.com) and Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include "ppm.h"
#define ROWS 200
#define COLS 320
#define MAXVAL 7
static short screen[ROWS*COLS/4]; /* simulates the Atari's video RAM */
int
main( int argc, char * argv[] ) {
FILE* ifp;
pixel pal[16]; /* Degas palette */
pixel* pixelrow;
int row;
ppm_init( &argc, argv );
/* Check args. */
if ( argc > 2 )
pm_usage( "[neofile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
/* Check header */
{
/* Flag */
short j;
pm_readbigshort (ifp, &j);
if ( j != 0 )
pm_error( "not a NEO file" );
}
{
/* Check resolution word */
short j;
pm_readbigshort (ifp, &j);
if ( j != 0 )
pm_error( "not a NEO file" );
}
{
int i;
/* Read the palette. */
for ( i = 0; i < 16; ++i ) {
short j;
pm_readbigshort (ifp, &j);
PPM_ASSIGN( pal[i],
( j & 0x700 ) >> 8,
( j & 0x070 ) >> 4,
( j & 0x007 ) );
}
}
/* Skip rest of header */
fseek(ifp, 128, SEEK_SET);
{
/* Read the screen data */
int i;
for ( i = 0; i < ROWS*COLS/4; ++i )
pm_readbigshort( ifp, &screen[i] );
}
pm_close( ifp );
/* Ok, get set for writing PPM. */
ppm_writeppminit( stdout, COLS, ROWS, MAXVAL, 0 );
pixelrow = ppm_allocrow( COLS );
/* Now do the conversion. */
for ( row = 0; row < ROWS; ++row ) {
int col;
for ( col = 0; col < COLS; ++col ) {
int c, ind, b, plane;
ind = 80 * row + ( ( col >> 4 ) << 2 );
b = 0x8000 >> ( col & 0xf );
c = 0;
for ( plane = 0; plane < 4; ++plane )
if ( b & screen[ind+plane] )
c |= (1 << plane);
pixelrow[col] = pal[c];
}
ppm_writeppmrow( stdout, pixelrow, COLS, MAXVAL, 0 );
}
pm_close( stdout );
exit( 0 );
}
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