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/* brushtopbm.c - read a doodle brush file and write a portable bitmap
**
** Copyright (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 "pbm.h"
static void getinit ARGS(( FILE* file, int* colsP, int* rowsP ));
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;
pbm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[brushfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
getinit( ifp, &cols, &rows );
pbm_writepbminit( stdout, cols, rows, 0 );
bitrow = pbm_allocrow( cols );
/* Compute padding to round cols up to the next multiple of 16. */
padright = ( ( cols + 15 ) / 16 ) * 16 - 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 );
/* Write row. */
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 )
FILE* file;
int* colsP;
int* rowsP;
{
int i;
if ( getc( file ) != 1 )
pm_error( "bad magic number 1" );
if ( getc( file ) != 0 )
pm_error( "bad magic number 2" );
*colsP = getc( file ) << 8;
*colsP += getc( file );
*rowsP = getc( file ) << 8;
*rowsP += getc( file );
bitsperitem = 8;
/* Junk rest of header. */
for ( i = 0; i < 10; ++i ) /* 10 is just a guess at the header size */
(void) getc( file );
}
static bit
getbit( file )
FILE* file;
{
bit b;
if ( bitsperitem == 8 )
{
item = getc( file );
bitsperitem = 0;
bitshift = 7;
}
++bitsperitem;
b = ( ( item >> bitshift) & 1 ) ? PBM_WHITE : PBM_BLACK;
--bitshift;
return b;
}
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