/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1995-1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/* LINTLIBRARY */

/*
 * prefresh.c
 *
 * XCurses Library
 *
 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#ifdef M_RCSID
#ifndef lint
static char rcsID[] =
"$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
"libxcurses/src/libc/xcurses/rcs/prefresh.c 1.4 1998/06/03 16:06:14 "
"cbates Exp $";
#endif
#endif

#include <private.h>

/*
 * Update newscr with the given pad then display to the terminal.
 */
int
prefresh(WINDOW *w, int pminr, int pminc, int sminr, int sminc,
        int smaxr, int smaxc)
{
        int     code;

        code = pnoutrefresh(w, pminr, pminc, sminr, sminc, smaxr, smaxc);
        if (code == OK)
                code = doupdate();

        return (code);
}

/*
 * Update newscr with the given pad.  This allows newscr to
 * be updated with several windows before doing a doupdate().
 *
 * MKS extension permits windows that are not pads to be refreshed
 * using this function.
 */
int
pnoutrefresh(WINDOW *pad, int pminr, int pminc, int sminr, int sminc,
        int smaxr, int smaxc)
{
        WINDOW  *ns;
        int     row, dy, dx;

        ns = __m_screen->_newscr;

        /* Adjust regions to be within bounds. */
        if (pminr < 0)
                pminr = 0;
        if (pminc < 0)
                pminc = 0;
        if (sminr < 0)
                sminr = 0;
        if (sminc < 0)
                sminc = 0;
        if (ns->_maxy <= smaxr)
                smaxr = ns->_maxy-1;
        if (ns->_maxx <= smaxc)
                smaxc = ns->_maxx-1;

        if (pad->_maxy <= pminr || pad->_maxx <= pminc ||
                smaxr < sminr || smaxc < sminc)
                return (ERR);

        /* Clear displayed region. */
        for (row = sminr; row < smaxr; ++row) {
                (void) __m_cc_erase(ns, row, sminc, row, smaxc);
        }

        /*
         * Determine the proper maximums in case smaxr and smaxc mapped
         * beyond the bottom and right-hand edges of the pad.
         */
        if (pad->_maxx <= pminc + smaxc-sminc + 1)
                smaxc = sminc + pad->_maxx - 1 - pminc;
        if (pad->_maxy <= pminr + smaxr-sminr + 1)
                smaxr = sminr + pad->_maxy - 1 - pminr;

        /* Remember refresh region (inclusive). */
        pad->_refy = (short) pminr;
        pad->_refx = (short) pminc;
        pad->_sminy = (short) sminr;
        pad->_sminx = (short) sminc;
        pad->_smaxy = (short) smaxr;
        pad->_smaxx = (short) smaxc;

        (void) copywin(pad, ns, pminr, pminc, sminr, sminc, smaxr, smaxc, 0);

        /* Last refreshed window controls W_LEAVE_CURSOR flag. */
        ns->_flags &= ~W_LEAVE_CURSOR;
        ns->_flags |= pad->_flags &
                (W_CLEAR_WINDOW | W_REDRAW_WINDOW | W_LEAVE_CURSOR);
        pad->_flags &= ~(W_CLEAR_WINDOW | W_REDRAW_WINDOW);

        /* Figure out where to leave the cursor. */
        dy = pad->_cury - pminr + pad->_begy;
        dx = pad->_curx - pminc + pad->_begx;

        ns->_cury = (dy < 0) ? 0 :
                ((ns->_maxy <= dy) ? ns->_maxy - 1 : (short) dy);
        ns->_curx = (dx < 0) ? 0 :
                ((ns->_maxx <= dx) ? ns->_maxx - 1 : (short) dx);

        return (OK);
}