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pnmenlarge.c
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C/C++ Source or Header
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1993-10-04
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2KB
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78 lines
/* 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 "pnm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
xel* xelrow;
xel* newxelrow;
register xel *xP;
register xel *nxP;
int argn, n, rows, cols, format, row;
register int col, subrow, subcol;
xelval maxval;
char* usage = "N [pnmfile]";
pnm_init( &argc, argv );
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" );
++argn;
if ( argn != argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
pnm_readpnminit( ifp, &cols, &rows, &maxval, &format );
xelrow = pnm_allocrow( cols );
pnm_writepnminit( stdout, cols * n, rows * n, maxval, format, 0 );
newxelrow = pnm_allocrow( cols * n );
for ( row = 0; row < rows; ++row )
{
pnm_readpnmrow( ifp, xelrow, cols, maxval, format );
for ( subrow = 0; subrow < n; ++subrow )
{
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
{
for ( subcol = 0, nxP = &(newxelrow[col * n]);
subcol < n; ++subcol, ++nxP )
*nxP = *xP;
}
pnm_writepnmrow( stdout, newxelrow, cols * n, maxval, format, 0 );
}
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}