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PBM_PLUS
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pnm
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pnminvert.c
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C/C++ Source or Header
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1980-12-04
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/* pnminvert.c - read a portable anymap and invert it
**
** Copyright (C) 1989 by 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 <stdio.h>
#include "pnm.h"
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
xelval maxval;
register xel *xelrow, *xP;
int rows, cols, format, row, col;
pm_progname = argv[0];
if ( argc > 2 )
pm_usage( "[pnmfile]" );
if ( argc == 2 )
ifd = pm_openr( argv[1] );
else
ifd = stdin;
pnm_readpnminit( ifd, &cols, &rows, &maxval, &format );
pnm_writepnminit( stdout, cols, rows, maxval, format );
xelrow = pnm_allocrow( cols );
for ( row = 0; row < rows; row++ )
{
pnm_readpnmrow( ifd, xelrow, cols, maxval, format );
for ( col = 0, xP = xelrow; col < cols; col++, xP++ )
*xP = pnm_invertxel( *xP, maxval, format );
pnm_writepnmrow( stdout, xelrow, cols, maxval, format );
}
pm_close( ifd );
exit( 0 );
}