NetBSD/lib/libcurses/overlay.c

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/*
* Copyright (c) 1981 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. 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
* SUCH DAMAGE.
*/
#ifndef lint
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/*static char sccsid[] = "from: @(#)overlay.c 5.6 (Berkeley) 6/1/90";*/
static char rcsid[] = "$Id: overlay.c,v 1.3 1993/08/01 18:35:29 mycroft Exp $";
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#endif /* not lint */
# include "curses.ext"
# define min(a,b) (a < b ? a : b)
# define max(a,b) (a > b ? a : b)
/*
* This routine writes win1 on win2 non-destructively.
*
*/
overlay(win1, win2)
reg WINDOW *win1, *win2; {
reg chtype *sp, *end;
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reg int x, y, endy, endx, starty, startx;
reg int y1,y2;
# ifdef DEBUG
fprintf(outf, "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
fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
# endif
if (starty >= endy || startx >= endx)
return;
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++) {
if (*sp != ' ')
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mvwaddch(win2, y2, x, *sp);
x++;
}
}
}