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PBM_PLUS
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pnm
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pnmenlarge.c
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C/C++ Source or Header
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1980-12-04
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/* pnmenlarge.c - read a portable anymap and enlarge it N times
**
** 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 "pnm.h"
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register xel *xelrow, *newxelrow, *xP;
int argn, n, rows, cols, format, row, col, subrow, subcol;
xelval maxval;
char *usage = "N [pnmfile]";
pm_progname = argv[0];
argn = 1;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &n ) != 1 )
pm_usage( usage );
if ( n < 2 )
pm_error( "N must be greater than 1", 0,0,0,0,0 );
argn++;
if ( argn != argc )
{
ifd = pm_openr( argv[argn] );
argn++;
}
else
ifd = stdin;
if ( argn != argc )
pm_usage( usage );
pnm_readpnminit( ifd, &cols, &rows, &maxval, &format );
xelrow = pnm_allocrow( cols );
pnm_writepnminit( stdout, cols * n, rows * n, maxval, format );
newxelrow = pnm_allocrow( cols * n );
for ( row = 0; row < rows; row++ )
{
pnm_readpnmrow( ifd, xelrow, cols, maxval, format );
for ( subrow = 0; subrow < n; subrow++ )
{
for ( col = 0, xP = xelrow; col < cols; col++, xP++ )
{
for ( subcol = 0; subcol < n; subcol++ )
newxelrow[col * n + subcol] = *xP;
}
pnm_writepnmrow( stdout, newxelrow, cols * n, maxval, format );
}
}
pm_close( ifd );
exit( 0 );
}