* Copyright (c) 1981 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
static char sccsid
[] = "@(#)overlay.c 5.4 (Berkeley) %G%";
# define min(a,b) (a < b ? a : b)
# define max(a,b) (a > b ? a : b)
* This routine writes win1 on win2 non-destructively.
reg WINDOW
*win1
, *win2
; {
reg
int x
, y
, endy
, endx
, starty
, startx
;
fprintf(outf
, "OVERLAY(%0.2o, %0.2o);\n", win1
, win2
);
starty
= max(win1
->_begy
, win2
->_begy
);
startx
= max(win1
->_begx
, win2
->_begx
);
endy
= min(win1
->_maxy
+ win1
->_begy
, win2
->_maxy
+ win2
->_begx
);
endx
= min(win1
->_maxx
+ win1
->_begx
, win2
->_maxx
+ win2
->_begx
);
fprintf(outf
, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty
, startx
, endy
, endx
);
if (starty
>= endy
|| startx
>= endx
)
y1
= starty
- win1
->_begy
;
y2
= starty
- win2
->_begy
;
for (y
= starty
; y
< endy
; y
++, y1
++, y2
++) {
end
= &win1
->_y
[y1
][endx
- win1
->_begx
];
x
= startx
- win2
->_begx
;
for (sp
= &win1
->_y
[y1
][startx
- win1
->_begx
]; sp
< end
; sp
++) {
mvwaddch(win2
, y2
, x
, *sp
);