overlay.c revision 1.12 
1/*	$NetBSD: overlay.c,v 1.12 2000/04/15 13:17:04 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)overlay.c	8.2 (Berkeley) 5/4/94";
40#else
41__RCSID("$NetBSD: overlay.c,v 1.12 2000/04/15 13:17:04 blymn Exp $");
42#endif
43#endif				/* not lint */
44
45#include <ctype.h>
46
47#include "curses.h"
48#include "curses_private.h"
49
50/*
51 * overlay --
52 *	Writes win1 on win2 non-destructively.
53 */
54int
55overlay(const WINDOW *win1, WINDOW *win2)
56{
57
58	int     x, y, y1, y2, endy, endx, starty, startx;
59	__LDATA *sp, *end;
60
61#ifdef DEBUG
62	__CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
63#endif
64	starty = max(win1->begy, win2->begy);
65	startx = max(win1->begx, win2->begx);
66	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
67	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
68#ifdef DEBUG
69	__CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
70	    starty, startx, endy, endx);
71#endif
72	if (starty >= endy || startx >= endx)
73		return (OK);
74	y1 = starty - win1->begy;
75	y2 = starty - win2->begy;
76	for (y = starty; y < endy; y++, y1++, y2++) {
77		end = &win1->lines[y1]->line[endx - win1->begx];
78		x = startx - win2->begx;
79		for (sp = &win1->lines[y1]->line[startx - win1->begx];
80		    sp < end; sp++) {
81			if (!isspace(sp->ch)) {
82				wmove(win2, y2, x);
83				__waddch(win2, sp);
84			}
85			x++;
86		}
87	}
88	return (OK);
89}
90