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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 "pnm.h"
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- xelval maxval;
- register xel* xelrow;
- register xel* xP;
- int rows, cols, format, row, col;
-
- pnm_init( &argc, argv );
-
- if ( argc > 2 )
- pm_usage( "[pnmfile]" );
-
- if ( argc == 2 )
- ifp = pm_openr( argv[1] );
- else
- ifp = stdin;
-
- pnm_readpnminit( ifp, &cols, &rows, &maxval, &format );
- pnm_writepnminit( stdout, cols, rows, maxval, format, 0 );
- xelrow = pnm_allocrow( cols );
-
- for ( row = 0; row < rows; ++row )
- {
- pnm_readpnmrow( ifp, xelrow, cols, maxval, format );
- for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
- pnm_invertxel( xP, maxval, format );
-
- pnm_writepnmrow( stdout, xelrow, cols, maxval, format, 0 );
- }
-
- pm_close( ifp );
- pm_close( stdout );
-
- exit( 0 );
- }
-