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Club Amiga de Montreal - CAM
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PBM_PLUS
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pbm
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cmuwmtopbm.c
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C/C++ Source or Header
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1980-12-04
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3KB
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141 lines
/* 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 <stdio.h>
#include "pbm.h"
#include "cmuwm.h"
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register bit *bitrow, *bP;
int rows, cols, depth, padright, row, col;
bit getbit();
pm_progname = argv[0];
if ( argc > 2 )
pm_usage( "[cmuwmfile]" );
if ( argc == 2 )
ifd = pm_openr( argv[1] );
else
ifd = stdin;
getinit( ifd, &cols, &rows, &depth, &padright );
if ( depth != 1 )
pm_error(
"CMU window manager file has depth of %d, must be 1",
depth, 0,0,0,0 );
pbm_writepbminit( stdout, cols, rows );
bitrow = pbm_allocrow( 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 );
pbm_writepbmrow( stdout, bitrow, cols );
}
pm_close( ifd );
exit( 0 );
}
unsigned char item;
int bitsperitem, bitshift;
getinit( file, colsP, rowsP, depthP, padrightP )
FILE *file;
int *colsP, *rowsP, *depthP, *padrightP;
{
long magic;
long get_big_long();
short get_big_short();
magic = get_big_long( file );
if ( magic != CMUWM_MAGIC )
pm_error( "bad magic number in CMU window manager file", 0,0,0,0,0 );
*colsP = get_big_long( file );
*rowsP = get_big_long( file );
*depthP = get_big_short( file );
*padrightP = ( ( *colsP + 7 ) / 8 ) * 8 - *colsP;
bitsperitem = 0;
}
bit
getbit( file )
FILE *file;
{
bit b;
unsigned char get_byte();
if ( bitsperitem == 0 )
{
item = get_byte( file );
bitsperitem = 8;
bitshift = 7;
}
b = ( ( item >> bitshift) & 1 ) ? PBM_WHITE : PBM_BLACK;
bitsperitem--;
bitshift--;
return b;
}
unsigned char
get_byte( f )
FILE *f;
{
int i;
i = getc( f );
if ( i == EOF )
pm_error( "premature EOF", 0,0,0,0,0 );
return (unsigned char) i;
}
short
get_big_short( f )
FILE *f;
{
short s;
s = get_byte( f ) << 8;
s |= get_byte( f );
return s;
}
long
get_big_long( f )
FILE *f;
{
long l;
l = get_byte( f ) << 24;
l |= get_byte( f ) << 16;
l |= get_byte( f ) << 8;
l |= get_byte( f );
return l;
}