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- /* pbmtoybm.c - read a pbm and write a file for Bennet Yee's 'xbm' and 'face'
- ** programs.
- **
- ** Written by Jamie Zawinski based on code (C) 1988 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 "pbm.h"
-
- #define YBM_MAGIC ( ( '!' << 8 ) | '!' )
-
- static void putinit ARGS(( int cols, int rows ));
- 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 );
- bitrow = pbm_allocrow( cols );
-
- /* Compute padding to round cols up to the nearest multiple of 16. */
- padright = ( ( cols + 15 ) / 16 ) * 16 - cols;
-
- putinit( cols, rows );
- 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 );
- }
-
- if ( ifp != stdin )
- fclose( ifp );
-
- putrest( );
-
- exit( 0 );
- }
-
- static long item;
- static int bitsperitem, bitshift;
-
- static void
- putinit( cols, rows )
- int cols, rows;
- {
- pm_writebigshort( stdout, YBM_MAGIC );
- pm_writebigshort( stdout, cols );
- pm_writebigshort( stdout, rows );
- item = 0;
- bitsperitem = 0;
- bitshift = 0;
- }
-
- #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( )
- {
- pm_writebigshort( stdout, item );
- item = 0;
- bitsperitem = 0;
- bitshift = 0;
- }
-