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/****************************************************************************
 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
**	lib_overlay.c
**
**	The routines overlay(), copywin(), and overwrite().
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: lib_overlay.c,v 1.14 2000/12/10 02:43:27 tom Exp $")

static int
overlap(const WINDOW *const s, WINDOW *const d, int const flag)
{
    int sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol;

    T(("overlap : sby %d, sbx %d, smy %d, smx %d, dby %d, dbx %d, dmy %d, dmx %d",
       s->_begy, s->_begx, s->_maxy, s->_maxx,
       d->_begy, d->_begx, d->_maxy, d->_maxx));

    if (!s || !d)
	returnCode(ERR);

    sminrow = max(s->_begy, d->_begy) - s->_begy;
    smincol = max(s->_begx, d->_begx) - s->_begx;
    dminrow = max(s->_begy, d->_begy) - d->_begy;
    dmincol = max(s->_begx, d->_begx) - d->_begx;
    dmaxrow = min(s->_maxy + s->_begy, d->_maxy + d->_begy) - d->_begy;
    dmaxcol = min(s->_maxx + s->_begx, d->_maxx + d->_begx) - d->_begx;

    return (copywin(s, d,
		    sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol,
		    flag));
}

/*
**
**	overlay(win1, win2)
**
**
**	overlay() writes the overlapping area of win1 behind win2
**	on win2 non-destructively.
**
**/

NCURSES_EXPORT(int)
overlay(const WINDOW *win1, WINDOW *win2)
{
    T((T_CALLED("overlay(%p,%p)"), win1, win2));
    returnCode(overlap(win1, win2, TRUE));
}

/*
**
**	overwrite(win1, win2)
**
**
**	overwrite() writes the overlapping area of win1 behind win2
**	on win2 destructively.
**
**/

NCURSES_EXPORT(int)
overwrite(const WINDOW *win1, WINDOW *win2)
{
    T((T_CALLED("overwrite(%p,%p)"), win1, win2));
    returnCode(overlap(win1, win2, FALSE));
}

NCURSES_EXPORT(int)
copywin
(const WINDOW *src, WINDOW *dst,
 int sminrow, int smincol,
 int dminrow, int dmincol, int dmaxrow, int dmaxcol,
 int over)
{
    int sx, sy, dx, dy;
    bool touched;
    chtype bk = AttrOf(dst->_bkgd);
    chtype mask = ~(chtype) ((bk & A_COLOR) ? A_COLOR : 0);

    T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
       src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));

    if (!src || !dst)
	returnCode(ERR);

    /* make sure rectangle exists in source */
    if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) ||
	(smincol + dmaxcol - dmincol) > (src->_maxx + 1)) {
	returnCode(ERR);
    }

    T(("rectangle exists in source"));

    /* make sure rectangle fits in destination */
    if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) {
	returnCode(ERR);
    }

    T(("rectangle fits in destination"));

    for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) {
	touched = FALSE;
	for (dx = dmincol, sx = smincol; dx <= dmaxcol; sx++, dx++) {
	    if (over) {
		if ((TextOf(src->_line[sy].text[sx]) != ' ') &&
		    (dst->_line[dy].text[dx] != src->_line[sy].text[sx])) {
		    dst->_line[dy].text[dx] =
			(src->_line[sy].text[sx] & mask) | bk;
		    touched = TRUE;
		}
	    } else {
		if (dst->_line[dy].text[dx] != src->_line[sy].text[sx]) {
		    dst->_line[dy].text[dx] = src->_line[sy].text[sx];
		    touched = TRUE;
		}
	    }
	}
	if (touched) {
	    touchline(dst, 0, getmaxy(dst));
	}
    }
    T(("finished copywin"));
    returnCode(OK);
}