Return to touchwin.c CVS log

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Make the touch family of calls actually force an update of the
terminal bypassing optimisations.  Previously if curses thought curscr
was in sync with virtscr (curses concept of what is on the screen) then
nothing would be output.  This change forces an update out to the terminal
regardless.

/*	$NetBSD: touchwin.c,v 1.27 2013/12/06 11:23:47 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[] = "@(#)touchwin.c	8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: touchwin.c,v 1.27 2013/12/06 11:23:47 blymn Exp $");
#endif
#endif				/* not lint */

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

static int _cursesi_touchline_force(WINDOW *, int, int, int, int);

/*
 * is_linetouched --
 *	Indicate if line has been touched or not.
 */
bool
is_linetouched(WINDOW *win, int line)
{
	if (line > win->maxy)
		return FALSE;

	return ((win->alines[line]->flags & __ISDIRTY) != 0);
}

/*
 * touchline --
 *	Touch count lines starting at start.  This is the SUS v2 compliant
 *	version.
 */
int
touchline(WINDOW *win, int start, int count)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "touchline: (%p, %d, %d)\n", win, start, count);
#endif
	return wtouchln(win, start, count, 1);
}

/*
 * wredrawln --
 *	Mark count lines starting at start as corrupted.  Implemented using
 *	wtouchln().
 */
int wredrawln(WINDOW *win, int start, int count)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "wredrawln: (%p, %d, %d)\n", win, start, count);
#endif
	return wtouchln(win, start, count, 1);
}

/*
 * is_wintouched --
 *	Check if the window has been touched.
 */
bool
is_wintouched(WINDOW *win)
{
	int y, maxy;

	maxy = win->maxy;
	for (y = 0; y < maxy; y++) {
		if (is_linetouched(win, y) == TRUE)
			return TRUE;
	}

	return FALSE;
}

/*
 * touchwin --
 *	Make it look like the whole window has been changed.
 */
int
touchwin(WINDOW *win)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "touchwin: (%p)\n", win);
#endif
	return wtouchln(win, 0, win->maxy, 1);
}

/*
 * redrawwin --
 *	Mark entire window as corrupted.  Implemented using wtouchln().
 */
int
redrawwin(WINDOW *win)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "redrawwin: (%p)\n", win);
#endif
	return wtouchln(win, 0, win->maxy, 1);
}

/*
 * untouchwin --
 *	 Make it look like the window has not been changed.
 */
int
untouchwin(WINDOW *win)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "untouchwin: (%p)\n", win);
#endif
	return wtouchln(win, 0, win->maxy, 0);
}

/*
 * wtouchln --
 *	If changed is 1 then touch n lines starting at line.  If changed
 *	is 0 then mark the lines as unchanged.
 */
int
wtouchln(WINDOW *win, int line, int n, int changed)
{
	int	y;
	__LINE	*wlp;

#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "wtouchln: (%p) %d, %d, %d\n",
	    win, line, n, changed);
#endif
	if (line + n > win->maxy)
		line = win->maxy - n;
	for (y = line; y < line + n; y++) {
		if (changed == 1)
			_cursesi_touchline_force(win, y, 0,
			    (int) win->maxx - 1, 1);
		else {
			wlp = win->alines[y];
			if (*wlp->firstchp >= win->ch_off &&
			    *wlp->firstchp < win->maxx + win->ch_off)
				*wlp->firstchp = win->maxx + win->ch_off;
			if (*wlp->lastchp >= win->ch_off &&
			    *wlp->lastchp < win->maxx + win->ch_off)
				*wlp->lastchp = win->ch_off;
			wlp->flags &= ~(__ISDIRTY | __ISFORCED);
		}
	}

	return OK;
}

int
__touchwin(WINDOW *win)
{
	int	 y, maxy;

#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "__touchwin: (%p)\n", win);
#endif
	maxy = win->maxy;
	for (y = 0; y < maxy; y++)
		__touchline(win, y, 0, (int) win->maxx - 1);
	return (OK);
}

int
__touchline(WINDOW *win, int y, int sx, int ex)
{
	return (_cursesi_touchline_force(win, y, sx, ex, 0));
}

/*
 * Touch line y on window win starting from column sx and ending at
 * column ex.  If force is 1 then we mark this line as a forced update
 * which will bypass screen optimisation in the refresh code to rewrite
 * this line unconditionally (even if refresh thinks the screen matches
 * what is in the virtscr)
 */
static int
_cursesi_touchline_force(WINDOW *win, int y, int sx, int ex, int force)
{
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "__touchline: (%p, %d, %d, %d)\n",
	    win, y, sx, ex);
	__CTRACE(__CTRACE_LINE, "__touchline: first = %d, last = %d\n",
	    *win->alines[y]->firstchp, *win->alines[y]->lastchp);
#endif
	sx += win->ch_off;
	ex += win->ch_off;
	win->alines[y]->flags |= __ISDIRTY;
	if (force == 1)
		win->alines[y]->flags |= __ISFORCED;
	/* firstchp/lastchp are shared between parent window and sub-window. */
	if (*win->alines[y]->firstchp > sx)
		*win->alines[y]->firstchp = sx;
	if (*win->alines[y]->lastchp < ex)
		*win->alines[y]->lastchp = ex;
#ifdef DEBUG
	__CTRACE(__CTRACE_LINE, "__touchline: first = %d, last = %d\n",
	    *win->alines[y]->firstchp, *win->alines[y]->lastchp);
#endif
	return (OK);
}

void
wsyncup(WINDOW *win)
{

	do {
		__touchwin(win);
		win = win->orig;
	} while (win);
}

void
wsyncdown(WINDOW *win)
{
	WINDOW *w = win->orig;

	while (w) {
		if (is_wintouched(w)) {
			__touchwin(win);
			break;
		}
		w = w->orig;
	}
}