xref: /illumos-gate/usr/src/lib/libcurses/screen/wnoutref.c (revision e07d85f87c3920e032adb855fdc500e4616c7718)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 /*LINTLIBRARY*/
41 
42 #include	<string.h>
43 #include	<sys/types.h>
44 #include	"curses_inc.h"
45 
46 /* Like refresh but does not output */
47 
48 int
wnoutrefresh(WINDOW * win)49 wnoutrefresh(WINDOW *win)
50 {
51 	short	*bch, *ech, *sbch, *sech;
52 	chtype	**wcp, **scp, *wc, *sc;
53 	int	*hash;
54 	short	y, x, xorg, yorg, scrli, scrco, boty, sminy, smaxy, minx,
55 	    maxx, lo, hi;
56 	bool	doall;
57 
58 	if (win->_parent)
59 		wsyncdown(win);
60 
61 	doall = win->_clear;
62 
63 	sminy = SP->Yabove;
64 	smaxy = sminy + LINES;
65 	scrli = curscr->_maxy;
66 	scrco = curscr->_maxx;
67 
68 	yorg = win->_begy + win->_yoffset;
69 	xorg = win->_begx;
70 
71 	/* save flags, cursor positions */
72 	SP->virt_scr->_leave = win->_leave;
73 	if ((!win->_leave && (win->_flags & (_WINCHANGED | _WINMOVED))) &&
74 	    ((y = win->_cury + yorg) >= 0) && (y < scrli) &&
75 	    ((x = win->_curx + xorg) >= 0) && (x < scrco)) {
76 		_virtscr->_cury = y;
77 		_virtscr->_curx = x;
78 	}
79 	if (!(win->_use_idc))
80 		_virtscr->_use_idc = FALSE;
81 	if (win->_use_idl)
82 		_virtscr->_use_idl = TRUE;
83 	if (win->_clear) {
84 		_virtscr->_clear = TRUE;
85 		win->_clear = FALSE;
86 		win->_flags |= _WINCHANGED;
87 	}
88 
89 	if (!(win->_flags & _WINCHANGED))
90 		goto done;
91 
92 	/* region to update */
93 	boty = win->_maxy+yorg;
94 	if (yorg >= sminy && yorg < smaxy && boty >= smaxy)
95 		boty = smaxy;
96 	else
97 		if (boty > scrli)
98 			boty = scrli;
99 	boty -= yorg;
100 
101 	minx = 0;
102 	if ((maxx = win->_maxx+xorg) > scrco)
103 		maxx = scrco;
104 	maxx -= xorg + 1;
105 
106 	/* update structure */
107 	bch = win->_firstch;
108 	ech = win->_lastch;
109 	wcp = win->_y;
110 
111 	hash = _VIRTHASH + yorg;
112 	sbch = _virtscr->_firstch + yorg;
113 	sech = _virtscr->_lastch + yorg;
114 	scp  = _virtscr->_y + yorg;
115 
116 	/* first time around, set proper top/bottom changed lines */
117 	if (curscr->_sync) {
118 		_VIRTTOP = scrli;
119 		_VIRTBOT = -1;
120 	}
121 
122 	/* update each line */
123 	for (y = 0; y < boty; ++y, ++hash, ++bch, ++ech, ++sbch,
124 	    ++sech, ++wcp, ++scp) {
125 		if (!doall && *bch == _INFINITY)
126 			continue;
127 
128 		lo = (doall || *bch == _REDRAW || *bch < minx) ? minx : *bch;
129 		hi = (doall || *bch == _REDRAW || *ech > maxx) ? maxx : *ech;
130 
131 		wc = *wcp;
132 		sc = *scp;
133 		/* adjust lo and hi so they contain whole characters */
134 		if (_scrmax > 1) {
135 			if (ISCBIT(wc[lo])) {
136 				for (x = lo - 1; x >= minx; --x)
137 					if (!ISCBIT(wc[x]))
138 						break;
139 				if (x < minx) {
140 					for (x = lo + 1; x <= maxx; ++x)
141 						if (!ISCBIT(wc[x]))
142 							break;
143 					if (x > maxx)
144 						goto nextline;
145 				}
146 				lo = x;
147 			}
148 			if (ISMBIT(wc[hi])) {
149 				int		w;
150 				unsigned char	rb;
151 				for (x = hi; x >= lo; --x)
152 					if (!ISCBIT(wc[x]))
153 						break;
154 				/* LINTED */
155 				rb = (unsigned char) RBYTE(wc[x]);
156 				w = _curs_scrwidth[TYPE(rb)];
157 				hi = (x+w) <= maxx+1 ? x+w-1 : x;
158 			}
159 		}
160 
161 		if (hi < lo)
162 			continue;
163 
164 		/* clear partial multi-chars about to be overwritten */
165 		if (_scrmax > 1) {
166 			if (ISMBIT(sc[lo + xorg]))
167 				(void) _mbclrch(_virtscr, y + yorg, lo + xorg);
168 			if (ISMBIT(sc[hi + xorg]))
169 				(void) _mbclrch(_virtscr, y + yorg, hi + xorg);
170 		}
171 
172 		/* update the change structure */
173 		if (*bch == _REDRAW || *sbch == _REDRAW)
174 			*sbch =  _REDRAW;
175 		else {
176 			if (*sbch > lo+xorg)
177 				*sbch = lo+xorg;
178 			if (*sech < hi+xorg)
179 				*sech = hi+xorg;
180 		}
181 		if ((y + yorg) < _VIRTTOP)
182 			_VIRTTOP = y+yorg;
183 		if ((y + yorg) > _VIRTBOT)
184 			_VIRTBOT = y + yorg;
185 
186 		/* update the image */
187 		wc = *wcp + lo;
188 		sc = *scp + lo + xorg;
189 		(void) memcpy((char *)sc, (char *)wc, (size_t)
190 		    (((hi - lo) + 1) * sizeof (chtype)));
191 
192 		/* the hash value of the line */
193 		*hash = _NOHASH;
194 
195 nextline:
196 		*bch = _INFINITY;
197 		*ech = -1;
198 	}
199 
200 done:
201 	_virtscr->_flags |= _WINCHANGED;
202 	win->_flags &= ~(_WINCHANGED | _WINMOVED | _WINSDEL);
203 	return (OK);
204 }
205