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/*
* Copyright (c) 1981, 1993, 1994
* 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
* are met:
* 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. 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
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 5/4/94";
#endif /* not lint */
#include <ctype.h>
#include "curses.h"
/*
* overlay --
* Writes win1 on win2 non-destructively.
*/
int
overlay(win1, win2)
register WINDOW *win1, *win2;
{
register int x, y, y1, y2, endy, endx, starty, startx;
register __LDATA *sp, *end;
#ifdef DEBUG
__CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
#endif
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);
#ifdef DEBUG
__CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
starty, startx, endy, endx);
#endif
if (starty >= endy || startx >= endx)
return (OK);
y1 = starty - win1->begy;
y2 = starty - win2->begy;
for (y = starty; y < endy; y++, y1++, y2++) {
end = &win1->lines[y1]->line[endx - win1->begx];
x = startx - win2->begx;
for (sp = &win1->lines[y1]->line[startx - win1->begx];
sp < end; sp++) {
if (!isspace(sp->ch)) {
wmove(win2, y2, x);
__waddch(win2, sp);
}
x++;
}
}
return (OK);
}
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