1 /* $NetBSD: toucholap.c,v 1.19 2024/12/23 02:58:04 blymn 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
35 static char sccsid[] = "@(#)toucholap.c 8.2 (Berkeley) 5/4/94";
36 #else
37 __RCSID("$NetBSD: toucholap.c,v 1.19 2024/12/23 02:58:04 blymn 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 */
48 int
touchoverlap(WINDOW * win1,WINDOW * win2)49 touchoverlap(WINDOW *win1, WINDOW *win2)
50 {
51 int y, endy, endx, starty, startx;
52
53 __CTRACE(__CTRACE_WINDOW, "touchoverlap: (%p, %p);\n", win1, win2);
54
55 if (__predict_false(win1 == NULL) || __predict_false(win2 == NULL))
56 return ERR;
57
58 starty = max(win1->begy, win2->begy);
59 startx = max(win1->begx, win2->begx);
60 endy = min(win1->maxy + win1->begy, win2->maxy + win2->begy);
61 endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
62 __CTRACE(__CTRACE_WINDOW, "touchoverlap: from (%d,%d) to (%d,%d)\n",
63 starty, startx, endy, endx);
64 __CTRACE(__CTRACE_WINDOW, "touchoverlap: win1 (%d,%d) to (%d,%d)\n",
65 win1->begy, win1->begx, win1->begy + win1->maxy,
66 win1->begx + win1->maxx);
67 __CTRACE(__CTRACE_WINDOW, "touchoverlap: win2 (%d,%d) to (%d,%d)\n",
68 win2->begy, win2->begx, win2->begy + win2->maxy,
69 win2->begx + win2->maxx);
70 if (starty >= endy || startx >= endx)
71 return OK;
72 starty -= win2->begy;
73 startx -= win2->begx;
74 endy -= win2->begy;
75 endx -= win2->begx;
76 for (--endx, y = starty; y < endy; y++)
77 __touchline(win2, y, startx, endx);
78 return OK;
79 }
80