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File: [cvs.NetBSD.org] / src / lib / libcurses / newwin.c (download)

Revision 1.67, Tue May 3 07:25:34 2022 UTC (22 months, 3 weeks ago) by blymn
Branch: MAIN
CVS Tags: netbsd-10-base, netbsd-10-0-RELEASE, netbsd-10-0-RC6, netbsd-10-0-RC5, netbsd-10-0-RC4, netbsd-10-0-RC3, netbsd-10-0-RC2, netbsd-10-0-RC1, netbsd-10, HEAD
Changes since 1.66: +3 -2 lines


 * Don't redraw the background if the new background character is the
   same as the old one.  This prevents excessive redraws in some
   applications.

 * Fix bug introduced when wbkgrndset was fixed, we cannot blindly
   replace any instance of the old background character with the new one
   because some of those characters were put there by the application
   leading to display corruption.  So flag characters as background when
   they are erased and only update the flagged characters when setting
   the background.

/*	$NetBSD: newwin.c,v 1.67 2022/05/03 07:25:34 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[] = "@(#)newwin.c	8.3 (Berkeley) 7/27/94";
#else
__RCSID("$NetBSD: newwin.c,v 1.67 2022/05/03 07:25:34 blymn Exp $");
#endif
#endif				/* not lint */

#include <stdlib.h>

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


static WINDOW *__makenew(SCREEN *screen, int nlines, int ncols, int by,
			 int bx, int sub, int ispad);
static WINDOW *__subwin(WINDOW *orig, int nlines, int ncols, int by, int bx,
			 int ispad);

/*
 * derwin --
 *      Create a new window in the same manner as subwin but (by, bx)
 *      are relative to the origin of window orig instead of absolute.
 */
WINDOW *
derwin(WINDOW *orig, int nlines, int ncols, int by, int bx)
{

	return __subwin(orig, nlines, ncols, orig->begy + by, orig->begx + bx,
	    FALSE);
}

/*
 * subpad --
 *      Create a new pad in the same manner as subwin but (by, bx)
 *      are relative to the origin of window orig instead of absolute.
 */
WINDOW *
subpad(WINDOW *orig, int nlines, int ncols, int by, int bx)
{

	return __subwin(orig, nlines, ncols, orig->begy + by, orig->begx + bx,
	    TRUE);
}

/*
 * dupwin --
 *      Create a copy of the given window.
 */
WINDOW *
dupwin(WINDOW *win)
{
	WINDOW *new_one;

	if ((new_one = __newwin(_cursesi_screen, win->maxy, win->maxx,
				win->begy, win->begx, FALSE,
				win == stdscr ? TRUE : FALSE)) == NULL)
		return NULL;

	overwrite(win, new_one);
	return new_one;
}

/*
 * newwin --
 *	Allocate space for and set up defaults for a new window.
 */
WINDOW *
newwin(int nlines, int ncols, int by, int bx)
{

	return __newwin(_cursesi_screen, nlines, ncols, by, bx, FALSE, FALSE);
}

/*
 * newpad --
 *	Allocate space for and set up defaults for a new pad.
 */
WINDOW *
newpad(int nlines, int ncols)
{

	if (nlines < 1 || ncols < 1)
		return NULL;
	return __newwin(_cursesi_screen, nlines, ncols, 0, 0, TRUE, FALSE);
}

WINDOW *
__newwin(SCREEN *screen, int nlines, int ncols, int by, int bx, int ispad,
    int isstdscr)
{
	WINDOW *win;
	__LINE *lp;
	int     i, j;
	int	ry, maxy, maxx;
	__LDATA *sp;

	if (by < 0 || bx < 0)
		return NULL;

	if (isstdscr) {
		ry = __rippedlines(screen, -1);
		by += __rippedlines(screen, 1);
	} else
		ry = 0;

	maxy = nlines > 0 ? nlines : LINES - by - ry + nlines;
	maxx = ncols > 0 ? ncols : COLS - bx + ncols;

	if ((win = __makenew(screen, maxy, maxx, by, bx, 0, ispad)) == NULL)
		return NULL;

#ifdef HAVE_WCHAR
	win->bch = (wchar_t) btowc((int) ' ');
#else
	win->bch = ' ';
#endif

	if (__using_color)
		win->battr |= __default_color;
	win->nextp = win;
	win->ch_off = 0;
	win->orig = NULL;
	win->reqy = nlines;
	win->reqx = ncols;

	__CTRACE(__CTRACE_WINDOW, "newwin: win->ch_off = %d\n", win->ch_off);

	for (i = 0; i < maxy; i++) {
		lp = win->alines[i];
		if (ispad)
			lp->flags = __ISDIRTY;
		else
			lp->flags = 0;
		for (sp = lp->line, j = 0; j < maxx; j++, sp++) {
			sp->attr = 0;
			sp->cflags = CA_BACKGROUND;
			sp->ch = win->bch;
#ifdef HAVE_WCHAR
			sp->nsp = NULL;
			sp->wcols = 1;
#endif /* HAVE_WCHAR */
		}
		lp->hash = __hash_line(lp->line, maxx);
	}
	return (win);
}

WINDOW *
subwin(WINDOW *orig, int nlines, int ncols, int by, int bx)
{

	return __subwin(orig, nlines, ncols, by, bx, FALSE);
}

static WINDOW *
__subwin(WINDOW *orig, int nlines, int ncols, int by, int bx, int ispad)
{
	int     i;
	__LINE *lp;
	WINDOW *win;
	int	maxy, maxx;

	__CTRACE(__CTRACE_WINDOW, "subwin: (%p, %d, %d, %d, %d, %d)\n",
	    orig, nlines, ncols, by, bx, ispad);
	if (orig == NULL)
		return NULL;

	/* Make sure window fits inside the original one. */
	maxy = nlines > 0 ? nlines : orig->maxy + orig->begy - by + nlines;
	maxx = ncols > 0 ? ncols : orig->maxx + orig->begx - bx + ncols;
	if (by < orig->begy || bx < orig->begx
	    || by + maxy > orig->maxy + orig->begy
	    || bx + maxx > orig->maxx + orig->begx)
		return NULL;
	if ((win = __makenew(_cursesi_screen, maxy, maxx,
			     by, bx, 1, ispad)) == NULL)
		return NULL;
	win->bch = orig->bch;
	win->battr = orig->battr;
	win->reqy = nlines;
	win->reqx = ncols;
	win->nextp = orig->nextp;
	orig->nextp = win;
	win->orig = orig;

	/* Initialize flags here so that refresh can also use __set_subwin. */
	for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++)
		lp->flags = 0;
	__set_subwin(orig, win);
	return win;
}
/*
 * This code is shared with mvwin().
 */
void
__set_subwin(WINDOW *orig, WINDOW *win)
{
	int     i;
	__LINE *lp, *olp;

	win->ch_off = win->begx - orig->begx;
	/* Point line pointers to line space. */
	for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) {
		win->alines[i] = lp;
		olp = orig->alines[i + win->begy - orig->begy];
#ifdef DEBUG
		lp->sentinel = SENTINEL_VALUE;
#endif
		lp->line = &olp->line[win->ch_off];
		lp->firstchp = &olp->firstch;
		lp->lastchp = &olp->lastch;
		lp->hash = __hash_line(lp->line, win->maxx);
	}

	__CTRACE(__CTRACE_WINDOW, "__set_subwin: win->ch_off = %d\n",
	    win->ch_off);
}
/*
 * __makenew --
 *	Set up a window buffer and returns a pointer to it.
 */
static WINDOW *
__makenew(SCREEN *screen, int nlines, int ncols, int by, int bx, int sub,
	int ispad)
{
	WINDOW			*win;
	__LINE			*lp;
	struct __winlist	*wlp, *wlp2;
	int			 i;


	__CTRACE(__CTRACE_WINDOW, "makenew: (%d, %d, %d, %d)\n",
	    nlines, ncols, by, bx);
	if (nlines <= 0 || ncols <= 0)
		return NULL;

	if ((win = malloc(sizeof(WINDOW))) == NULL)
		return NULL;
	__CTRACE(__CTRACE_WINDOW, "makenew: win = %p\n", win);
	win->fp = NULL;
	win->buf = NULL;
	win->buflen = 0;

	/* Set up line pointer array and line space. */
	if ((win->alines = malloc(nlines * sizeof(__LINE *))) == NULL) {
		free(win);
		return NULL;
	}
	if ((win->lspace = calloc(nlines, sizeof(__LINE))) == NULL) {
		free(win->alines);
		free(win);
		return NULL;
	}
	/* Don't allocate window and line space if it's a subwindow */
	if (sub)
		win->wspace = NULL;
	else {
		/*
		 * Allocate window space in one chunk.
		 */
		if ((win->wspace =
			calloc(ncols * nlines, sizeof(__LDATA))) == NULL) {
			free(win->lspace);
			free(win->alines);
			free(win);
			return NULL;
		}
		/*
		 * Append window to window list.
		 */
		if ((wlp = malloc(sizeof(struct __winlist))) == NULL) {
			free(win->wspace);
			free(win->lspace);
			free(win->alines);
			free(win);
			return NULL;
		}
		wlp->winp = win;
		wlp->nextp = NULL;
		if (screen->winlistp == NULL)
			screen->winlistp = wlp;
		else {
			wlp2 = screen->winlistp;
			while (wlp2->nextp != NULL)
				wlp2 = wlp2->nextp;
			wlp2->nextp = wlp;
		}
		/*
		 * Point line pointers to line space, and lines themselves into
		 * window space.
		 */
		for (lp = win->lspace, i = 0; i < nlines; i++, lp++) {
			win->alines[i] = lp;
			lp->line = &win->wspace[i * ncols];
#ifdef DEBUG
			lp->sentinel = SENTINEL_VALUE;
#endif
			lp->firstchp = &lp->firstch;
			lp->lastchp = &lp->lastch;
			if (ispad) {
				lp->firstch = 0;
				lp->lastch = ncols;
			} else {
				lp->firstch = ncols;
				lp->lastch = 0;
			}
		}
	}
	__CTRACE(__CTRACE_WINDOW, "makenew: ncols = %d\n", ncols);
	win->screen = screen;
	win->cury = win->curx = 0;
	win->maxy = nlines;
	win->maxx = ncols;
	win->reqy = nlines;
	win->reqx = ncols;

	win->begy = by;
	win->begx = bx;
	win->flags = (__IDLINE | __IDCHAR);
	win->delay = -1;
	win->wattr = 0;
	win->battr = 0;
#ifdef HAVE_WCHAR
	win->bnsp = NULL;
	win->wcols = 1;
#endif /* HAVE_WCHAR */
	win->scr_t = 0;
	win->scr_b = win->maxy - 1;
	if (ispad) {
		win->flags |= __ISPAD;
		win->pbegy = 0;
		win->pbegx = 0;
		win->sbegy = 0;
		win->sbegx = 0;
		win->smaxy = 0;
		win->smaxx = 0;
	} else
		__swflags(win);
	__CTRACE(__CTRACE_WINDOW, "makenew: sub = %d\n", sub);
	__CTRACE(__CTRACE_WINDOW, "makenew: ispad = %d\n", ispad);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->wattr = %08x\n", win->wattr);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->flags = %#.4x\n", win->flags);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->maxy = %d\n", win->maxy);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->maxx = %d\n", win->maxx);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->begy = %d\n", win->begy);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->begx = %d\n", win->begx);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->scr_t = %d\n", win->scr_t);
	__CTRACE(__CTRACE_WINDOW, "makenew: win->scr_b = %d\n", win->scr_b);
	return win;
}

void
__swflags(WINDOW *win)
{
	TERMINAL *term = win->screen->term;

	win->flags &= ~(__ENDLINE | __FULLWIN | __SCROLLWIN | __LEAVEOK);
	if (win->begx + win->maxx == win->screen->COLS &&
	    !(win->flags & __ISPAD))
	{
		win->flags |= __ENDLINE;
		if (win->begx == 0 &&
		    win->maxy == win->screen->LINES &&
		    win->begy == 0)
			win->flags |= __FULLWIN;
		if (win->begy + win->maxy == win->screen->LINES &&
		    t_auto_right_margin(term) &&
		    !(t_insert_character(term) != NULL ||
		    t_parm_ich(term) != NULL ||
		    (t_enter_insert_mode(term) != NULL &&
		     t_exit_insert_mode(term) != NULL)))
			win->flags |= __SCROLLWIN;
	}
}

/*
 * is_pad --
 *	Return true if window was created by newpad.
 */
bool
is_pad(const WINDOW *win)
{

	return win->flags & __ISPAD ? true : false;
}