* Copyright (c) 1981, 1993
* The Regents of the University of California. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
static char sccsid
[] = "@(#)overlay.c 8.1 (Berkeley) 6/4/93";
* Writes win1 on win2 non-destructively.
register WINDOW
*win1
, *win2
;
register int x
, y
, y1
, y2
, endy
, endx
, starty
, startx
;
register __LDATA
*sp
, *end
;
__CTRACE("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
);
__CTRACE("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
->lines
[y1
]->line
[endx
- win1
->begx
];
for (sp
= &win1
->lines
[y1
]->line
[startx
- win1
->begx
];