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PBM_PLUS
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pnm
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pnmpaste.c
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1980-12-04
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/* pnmpaste.c - paste a rectangle into a portable anymap
**
** 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 *ifd1, *ifd2;
register xel **xels1, **xels2, *x1P, *x2P;
xelval maxval1, maxval2, newmaxval;
int argn, rows1, cols1, format1, x, y;
int rows2, cols2, format2, newformat, row;
register int col;
char *usage = "frompnmfile x y [intopnmfile]";
pm_progname = argv[0];
argn = 1;
if ( argn == argc )
pm_usage( usage );
ifd1 = pm_openr( argv[argn] );
argn++;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &x ) != 1 )
pm_usage( usage );
argn++;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &y ) != 1 )
pm_usage( usage );
argn++;
if ( argn != argc )
{
ifd2 = pm_openr( argv[argn] );
argn++;
}
else
ifd2 = stdin;
if ( argn != argc )
pm_usage( usage );
xels1 = pnm_readpnm( ifd1, &cols1, &rows1, &maxval1, &format1 );
pm_close( ifd1 );
xels2 = pnm_readpnm( ifd2, &cols2, &rows2, &maxval2, &format2 );
pm_close( ifd2 );
if ( format1 > format2 )
{
newformat = format1;
newmaxval = maxval1;
}
else
{
newformat = format2;
newmaxval = maxval2;
}
pnm_promoteformat( xels1, cols2, rows1, maxval1, format1, newmaxval, newformat );
pnm_promoteformat( xels2, cols2, rows2, maxval2, format2, newmaxval, newformat );
if ( x <= -cols2 )
pm_error(
"x is too negative -- the second anymap has only %d cols",
cols2, 0,0,0,0 );
if ( y <= -rows2 )
pm_error(
"y is too negative -- the second anymap has only %d rows",
rows2, 0,0,0,0 );
if ( x < 0 )
x = cols2 - x;
if ( y < 0 )
y = rows2 - y;
if ( x >= cols2 )
pm_error(
"x is too large -- the second anymap has only %d cols",
cols2, 0,0,0,0 );
if ( y >= rows2 )
pm_error(
"y is too large -- the second anymap has only %d rows",
rows2, 0,0,0,0 );
if ( x + cols1 > cols2 )
pm_error(
"x + width is too large by %d pixels", x + cols1 - cols2, 0,0,0,0 );
if ( y + rows1 > rows2 )
pm_error(
"y + height is too large by %d pixels", y + rows1 - rows2,
0,0,0,0 );
for ( row = 0; row < rows1; row++ )
{
for ( col = 0, x1P = xels1[row], x2P = &(xels2[row+y][x]); col < cols1; col++, x1P++, x2P++ )
*x2P = *x1P;
}
pnm_writepnm( stdout, xels2, cols2, rows2, newmaxval, newformat );
exit( 0 );
}