# define min(a,b) (a < b ? a : b)
# define max(a,b) (a < b ? a : b)
* This routine writes win1 on win2 non-destructively.
* %G% (Berkeley) @(#)overlay.c 1.3
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
) - win1
->_begy
;
startx
= max(win1
->_begx
, win2
->_begx
) - win1
->_begx
;
endy
= min(win1
->_maxy
, win2
->_maxy
) - win1
->_begy
- 1;
endx
= min(win1
->_maxx
, win2
->_maxx
) - win1
->_begx
- 1;
for (y
= starty
; y
< endy
; y
++) {
end
= &win1
->_y
[y
][endx
];
x
= startx
+ win1
->_begx
;
for (sp
= &win1
->_y
[y
][startx
]; sp
<= end
; sp
++) {
mvwaddch(win2
, y
+ win1
->_begy
, x
, *sp
);