/*      $NetBSD: mvwin.c,v 1.25 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[] = "@(#)mvwin.c     8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: mvwin.c,v 1.25 2024/12/23 02:58:04 blymn Exp $");
#endif
#endif                          /* not lint */

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

/*
* mvderwin --
*      Move a derived window.  This does not change the physical screen
* coordinates of the subwin, rather maps the characters in the subwin
* sized part of the parent window starting at dy, dx into the subwin.
*
*/
int
mvderwin(WINDOW *win, int dy, int dx)
{
       WINDOW *parent;
       int x, i;
       __LINE *plp;

       if (__predict_false(win == NULL))
               return ERR;

       parent = win->orig;

       if (parent == NULL)
               return ERR;

       if (((win->maxx + dx) > parent->maxx) ||
           ((win->maxy + dy) > parent->maxy))
               return ERR;

       win->flags |= __ISDERWIN;
       win->derx = dx;
       win->dery = dy;

       x = parent->begx + dx;

       /*
        * Mark the source area for the derwin as changed so it will be
        * copied to the destination window on refresh.
        */
       for (i = 0; i < win->maxy; i++) {
               plp = parent->alines[i + dy];
               plp->flags = __ISDIRTY;
               if (*plp->firstchp > x)
                       *plp->firstchp = x;
               if (*plp->lastchp < x + win->maxx)
                       *plp->lastchp = x + win->maxx;
               __CTRACE(__CTRACE_REFRESH,
                   "mvderwin: firstchp = %d, lastchp = %d\n",
                   *plp->firstchp, *plp->lastchp);
       }

       return OK;
}

/*
* mvwin --
*      Relocate the starting position of a window.
*/
int
mvwin(WINDOW *win, int by, int bx)
{
       WINDOW *orig;
       int     dy, dx;

       if (__predict_false(win == NULL))
               return ERR;

       if (by < 0 || by + win->maxy > win->screen->LINES ||
           bx < 0 || bx + win->maxx > win->screen->COLS)
               return ERR;
       dy = by - win->begy;
       dx = bx - win->begx;
       orig = win->orig;
       if (orig == NULL) {
               orig = win;
               do {
                       win->begy += dy;
                       win->begx += dx;
                       __swflags(win);
                       win = win->nextp;
               } while (win != orig);
       } else {
               if (by < orig->begy || win->maxy + dy > orig->maxy)
                       return ERR;
               if (bx < orig->begx || win->maxx + dx > orig->maxx)
                       return ERR;
               win->begy = by;
               win->begx = bx;
               __swflags(win);
               __set_subwin(orig, win);
       }
       __touchwin(win, 0);
       return OK;
}