1/*	$NetBSD: toucholap.c,v 1.18 2021/09/06 07:03:50 rin Exp $	*/
2
3/*
4 * Copyright (c) 1981, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)toucholap.c	8.2 (Berkeley) 5/4/94";
36#else
37__RCSID("$NetBSD: toucholap.c,v 1.18 2021/09/06 07:03:50 rin Exp $");
38#endif
39#endif				/* not lint */
40
41#include "curses.h"
42#include "curses_private.h"
43
44/*
45 * touchoverlap --
46 *	Touch, on win2, the part that overlaps with win1.
47 */
48int
49touchoverlap(WINDOW *win1, WINDOW *win2)
50{
51	int     y, endy, endx, starty, startx;
52
53	__CTRACE(__CTRACE_WINDOW, "touchoverlap: (%p, %p);\n", win1, win2);
54	starty = max(win1->begy, win2->begy);
55	startx = max(win1->begx, win2->begx);
56	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begy);
57	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
58	__CTRACE(__CTRACE_WINDOW, "touchoverlap: from (%d,%d) to (%d,%d)\n",
59	    starty, startx, endy, endx);
60	__CTRACE(__CTRACE_WINDOW, "touchoverlap: win1 (%d,%d) to (%d,%d)\n",
61	    win1->begy, win1->begx, win1->begy + win1->maxy,
62	    win1->begx + win1->maxx);
63	__CTRACE(__CTRACE_WINDOW, "touchoverlap: win2 (%d,%d) to (%d,%d)\n",
64	    win2->begy, win2->begx, win2->begy + win2->maxy,
65	    win2->begx + win2->maxx);
66	if (starty >= endy || startx >= endx)
67		return OK;
68	starty -= win2->begy;
69	startx -= win2->begx;
70	endy -= win2->begy;
71	endx -= win2->begx;
72	for (--endx, y = starty; y < endy; y++)
73		__touchline(win2, y, startx, endx);
74	return OK;
75}
76