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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 "pm_c_util.h"
#include "pnm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp1;
FILE* ifp2;
register xel* xelrow1;
register xel* xelrow2;
register xel* x1P;
register xel* x2P;
xelval maxval1, maxval2, newmaxval;
int argn, rows1, cols1, format1, x, y;
int rows2, cols2, format2, newformat, row;
register int col;
char function;
const char* const usage = "[-replace|-or|-and|-xor] frompnmfile x y [intopnmfile]";
pnm_init( &argc, argv );
argn = 1;
function = 'r';
/* Check for flags. */
if ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-replace", 2 ) )
function = 'r';
else if ( pm_keymatch( argv[argn], "-or", 2 ) )
function = 'o';
else if ( pm_keymatch( argv[argn], "-and", 2 ) )
function = 'a';
else if ( pm_keymatch( argv[argn], "-xor", 2 ) )
function = 'x';
else
pm_usage( usage );
++argn;
}
if ( argn == argc )
pm_usage( usage );
ifp1 = 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 )
{
ifp2 = pm_openr( argv[argn] );
++argn;
}
else
ifp2 = stdin;
if ( argn != argc )
pm_usage( usage );
pnm_readpnminit( ifp1, &cols1, &rows1, &maxval1, &format1 );
xelrow1 = pnm_allocrow(cols1);
pnm_readpnminit( ifp2, &cols2, &rows2, &maxval2, &format2 );
xelrow2 = pnm_allocrow(cols2);
if ( x <= -cols2 )
pm_error(
"x is too negative -- the second anymap has only %d cols",
cols2 );
else if ( x >= cols2 )
pm_error(
"x is too large -- the second anymap has only %d cols",
cols2 );
if ( y <= -rows2 )
pm_error(
"y is too negative -- the second anymap has only %d rows",
rows2 );
else if ( y >= rows2 )
pm_error(
"y is too large -- the second anymap has only %d rows",
rows2 );
if ( x < 0 )
x += cols2;
if ( y < 0 )
y += rows2;
if ( x + cols1 > cols2 )
pm_error( "x + width is too large by %d pixels", x + cols1 - cols2 );
if ( y + rows1 > rows2 )
pm_error( "y + height is too large by %d pixels", y + rows1 - rows2 );
newformat = MAX( PNM_FORMAT_TYPE(format1), PNM_FORMAT_TYPE(format2) );
newmaxval = MAX( maxval1, maxval2 );
if ( function != 'r' && newformat != PBM_TYPE )
pm_error( "no logical operations allowed for non-bitmaps" );
pnm_writepnminit( stdout, cols2, rows2, newmaxval, newformat, 0 );
for ( row = 0; row < rows2; ++row )
{
pnm_readpnmrow( ifp2, xelrow2, cols2, maxval2, format2 );
pnm_promoteformatrow( xelrow2, cols2, maxval2, format2,
newmaxval, newformat );
if ( row >= y && row < y + rows1 )
{
pnm_readpnmrow( ifp1, xelrow1, cols1, maxval1, format1 );
pnm_promoteformatrow( xelrow1, cols1, maxval1, format1,
newmaxval, newformat );
for ( col = 0, x1P = xelrow1, x2P = &(xelrow2[x]);
col < cols1; ++col, ++x1P, ++x2P )
{
register xelval b1, b2;
switch ( function )
{
case 'r':
*x2P = *x1P;
break;
case 'o':
b1 = PNM_GET1( *x1P );
b2 = PNM_GET1( *x2P );
if ( b1 != 0 || b2 != 0 )
PNM_ASSIGN1( *x2P, newmaxval );
else
PNM_ASSIGN1( *x2P, 0 );
break;
case 'a':
b1 = PNM_GET1( *x1P );
b2 = PNM_GET1( *x2P );
if ( b1 != 0 && b2 != 0 )
PNM_ASSIGN1( *x2P, newmaxval );
else
PNM_ASSIGN1( *x2P, 0 );
break;
case 'x':
b1 = PNM_GET1( *x1P );
b2 = PNM_GET1( *x2P );
if ( ( b1 != 0 && b2 == 0 ) || ( b1 == 0 && b2 != 0 ) )
PNM_ASSIGN1( *x2P, newmaxval );
else
PNM_ASSIGN1( *x2P, 0 );
break;
default:
pm_error( "can't happen" );
}
}
}
pnm_writepnmrow( stdout, xelrow2, cols2, newmaxval, newformat, 0 );
}
pm_close( ifp1 );
pm_close( ifp2 );
pm_close( stdout );
exit( 0 );
}
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