/*      $NetBSD: toucholap.c,v 1.19 2024/12/23 02:58:04 blymn Exp $     */

/*
* 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.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)toucholap.c 8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: toucholap.c,v 1.19 2024/12/23 02:58:04 blymn Exp $");
#endif
#endif                          /* not lint */

#include "curses.h"
#include "curses_private.h"

/*
* touchoverlap --
*      Touch, on win2, the part that overlaps with win1.
*/
int
touchoverlap(WINDOW *win1, WINDOW *win2)
{
       int     y, endy, endx, starty, startx;

       __CTRACE(__CTRACE_WINDOW, "touchoverlap: (%p, %p);\n", win1, win2);

       if (__predict_false(win1 == NULL) || __predict_false(win2 == NULL))
               return ERR;

       starty = max(win1->begy, win2->begy);
       startx = max(win1->begx, win2->begx);
       endy = min(win1->maxy + win1->begy, win2->maxy + win2->begy);
       endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
       __CTRACE(__CTRACE_WINDOW, "touchoverlap: from (%d,%d) to (%d,%d)\n",
           starty, startx, endy, endx);
       __CTRACE(__CTRACE_WINDOW, "touchoverlap: win1 (%d,%d) to (%d,%d)\n",
           win1->begy, win1->begx, win1->begy + win1->maxy,
           win1->begx + win1->maxx);
       __CTRACE(__CTRACE_WINDOW, "touchoverlap: win2 (%d,%d) to (%d,%d)\n",
           win2->begy, win2->begx, win2->begy + win2->maxy,
           win2->begx + win2->maxx);
       if (starty >= endy || startx >= endx)
               return OK;
       starty -= win2->begy;
       startx -= win2->begx;
       endy -= win2->begy;
       endx -= win2->begx;
       for (--endx, y = starty; y < endy; y++)
               __touchline(win2, y, startx, endx);
       return OK;
}