home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Club Amiga de Montreal - CAM
/
CAM_CD_1.iso
/
files
/
309.lha
/
PBM_PLUS
/
pbm
/
brushtopbm.c
< prev
next >
Wrap
C/C++ Source or Header
|
1980-12-04
|
2KB
|
101 lines
/* 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 <stdio.h>
#include "pbm.h"
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register bit *bitrow, *bP;
bit getbit();
int rows, cols, padright, row, col;
pm_progname = argv[0];
if ( argc > 2 )
pm_usage( "[brushfile]" );
if ( argc == 2 )
ifd = pm_openr( argv[1] );
else
ifd = stdin;
getinit( ifd, &cols, &rows );
pbm_writepbminit( stdout, cols, rows );
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( ifd );
/* Discard line padding. */
for ( col = 0; col < padright; col++ )
(void) getbit( ifd );
/* Write row. */
pbm_writepbmrow( stdout, bitrow, cols );
}
pm_close( ifd );
exit( 0 );
}
int item, bitsperitem, bitshift;
getinit( file, colp, rowp )
FILE *file;
int *colp, *rowp;
{
int i;
if ( getc( file ) != 1 )
pm_error( "bad magic number 1", 0,0,0,0,0 );
if ( getc( file ) != 0 )
pm_error( "bad magic number 2", 0,0,0,0,0 );
*colp = getc( file ) << 8;
*colp += getc( file );
*rowp = getc( file ) << 8;
*rowp += 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 );
}
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;
}