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- /* pbmtopi3.c - read a portable bitmap and produce a Atari Degas .pi3 file
- **
- ** Module created from other pbmplus tools by David Beckemeyer.
- **
- ** Copyright (C) 1988 by David Beckemeyer 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 <stdio.h>
- #include "pbm.h"
-
- static void putinit ARGS(( void ));
- static void putbit ARGS(( bit b ));
- static void putrest ARGS(( void ));
- static void putitem ARGS(( void ));
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- bit* bitrow;
- register bit* bP;
- int rows, cols, format, padright, row, col;
-
-
- pbm_init( &argc, argv );
-
- if ( argc > 2 )
- pm_usage( "[pbmfile]" );
-
- if ( argc == 2 )
- ifp = pm_openr( argv[1] );
- else
- ifp = stdin;
-
- pbm_readpbminit( ifp, &cols, &rows, &format );
- if (cols > 640)
- cols = 640;
- if (rows > 400)
- rows = 400;
- bitrow = pbm_allocrow( cols );
-
- /* Compute padding to round cols up to 640 */
- padright = 640 - cols;
-
- putinit( );
- for ( row = 0; row < rows; ++row )
- {
- pbm_readpbmrow( ifp, bitrow, cols, format );
- for ( col = 0, bP = bitrow; col < cols; ++col, ++bP )
- putbit( *bP );
- for ( col = 0; col < padright; ++col )
- putbit( 0 );
- }
- while (row++ < 400)
- for ( col = 0; col < 640; ++col)
- putbit( 0 );
-
- pm_close( ifp );
-
- putrest( );
-
- exit( 0 );
- }
-
- static short item;
- static short bitsperitem, bitshift;
-
- static void
- putinit( )
- {
- struct degasHDR {
- short res;
- short pal[16];
- } hdr;
-
- hdr.res = 2;
- hdr.pal[0] = 0x0777;
- hdr.pal[1] = 0x0700;
- fwrite( &hdr, sizeof(hdr), 1, stdout );
- item = 0;
- bitsperitem = 0;
- bitshift = 15;
- }
-
- #if __STDC__
- static void
- putbit( bit b )
- #else /*__STDC__*/
- static void
- putbit( b )
- bit b;
- #endif /*__STDC__*/
- {
- if ( bitsperitem == 16 )
- putitem( );
- ++bitsperitem;
- if ( b == PBM_BLACK )
- item += 1 << bitshift;
- --bitshift;
- }
-
- static void
- putrest( )
- {
- if ( bitsperitem > 0 )
- putitem( );
- }
-
- static void
- putitem( )
- {
- fwrite( &item, sizeof(item), 1, stdout );
- item = 0;
- bitsperitem = 0;
- bitshift = 15;
- }
-