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/* cmuwmtopbm.c - read a CMU window manager bitmap and produce a portable bitmap
**
** 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 "pbm.h"
#include "cmuwm.h"
static void getinit ARGS(( FILE* file, int* colsP, int* rowsP, short* depthP, int* padrightP ));
static bit getbit ARGS(( FILE* file ));
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
bit* bitrow;
register bit* bP;
int rows, cols, padright, row, col;
short depth;
pbm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[cmuwmfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
getinit( ifp, &cols, &rows, &depth, &padright );
if ( depth != 1 )
pm_error(
"CMU window manager file has depth of %d, must be 1",
(int) depth );
pbm_writepbminit( stdout, cols, rows, 0 );
bitrow = pbm_allocrow( cols );
for ( row = 0; row < rows; ++row )
{
/* Get data. */
for ( col = 0, bP = bitrow; col < cols; ++col, ++bP )
*bP = getbit( ifp );
/* Discard line padding */
for ( col = 0; col < padright; ++col )
(void) getbit( ifp );
pbm_writepbmrow( stdout, bitrow, cols, 0 );
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}
static int item, bitsperitem, bitshift;
static void
getinit( file, colsP, rowsP, depthP, padrightP )
FILE* file;
int* colsP;
int* rowsP;
short* depthP;
int* padrightP;
{
long l;
if ( pm_readbiglong( file, &l ) == -1 )
pm_error( "EOF / read error" );
if ( (uint32_t)l != CMUWM_MAGIC )
pm_error( "bad magic number in CMU window manager file" );
if ( pm_readbiglong( file, &l ) == -1 )
pm_error( "EOF / read error" );
*colsP = (int) l;
if ( pm_readbiglong( file, &l ) == -1 )
pm_error( "EOF / read error" );
*rowsP = (int) l;
if ( pm_readbigshort( file, depthP ) == -1 )
pm_error( "EOF / read error" );
*padrightP = ( ( *colsP + 7 ) / 8 ) * 8 - *colsP;
bitsperitem = 0;
}
static bit
getbit( file )
FILE* file;
{
bit b;
if ( bitsperitem == 0 )
{
item = getc( file );
if ( item == EOF )
pm_error( "EOF / read error" );
bitsperitem = 8;
bitshift = 7;
}
b = ( ( item >> bitshift) & 1 ) ? PBM_WHITE : PBM_BLACK;
--bitsperitem;
--bitshift;
return b;
}
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