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      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
     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