aboutsummaryrefslogtreecommitdiff
path: root/contrib/ncurses/ncurses/base/lib_pad.c
blob: 556fb19e6993ca5c9c50d9fedb737966804b5eaf (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
/****************************************************************************
 * Copyright (c) 1998-2001,2002 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_pad.c
 * newpad	-- create a new pad
 * pnoutrefresh -- refresh a pad, no update
 * pechochar	-- add a char to a pad and refresh
 */

#include <curses.priv.h>

MODULE_ID("$Id: lib_pad.c,v 1.36 2002/05/18 21:28:44 Kriang.Lerdsuwanakij Exp $")

NCURSES_EXPORT(WINDOW *)
newpad(int l, int c)
{
    WINDOW *win;
    NCURSES_CH_T *ptr;
    int i;

    T((T_CALLED("newpad(%d, %d)"), l, c));

    if (l <= 0 || c <= 0)
	returnWin(0);

    if ((win = _nc_makenew(l, c, 0, 0, _ISPAD)) == NULL)
	returnWin(0);

    for (i = 0; i < l; i++) {
	if_USE_SCROLL_HINTS(win->_line[i].oldindex = _NEWINDEX);
	if ((win->_line[i].text = typeCalloc(NCURSES_CH_T, ((size_t) c))) == 0) {
	    (void) _nc_freewin(win);
	    returnWin(0);
	}
	for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; ptr++)
	    SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
    }

    returnWin(win);
}

NCURSES_EXPORT(WINDOW *)
subpad
(WINDOW *orig, int l, int c, int begy, int begx)
{
    WINDOW *win = (WINDOW *) 0;

    T((T_CALLED("subpad(%d, %d)"), l, c));

    if (orig) {
	if (!(orig->_flags & _ISPAD)
	    || ((win = derwin(orig, l, c, begy, begx)) == NULL))
	    returnWin(0);
    }
    returnWin(win);
}

NCURSES_EXPORT(int)
prefresh
(WINDOW *win, int pminrow, int pmincol,
 int sminrow, int smincol, int smaxrow, int smaxcol)
{
    T((T_CALLED("prefresh()")));
    if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow,
		     smaxcol) != ERR
	&& doupdate() != ERR) {
	returnCode(OK);
    }
    returnCode(ERR);
}

NCURSES_EXPORT(int)
pnoutrefresh
(WINDOW *win, int pminrow, int pmincol,
 int sminrow, int smincol, int smaxrow, int smaxcol)
{
    NCURSES_SIZE_T i, j;
    NCURSES_SIZE_T m, n;
    NCURSES_SIZE_T pmaxrow;
    NCURSES_SIZE_T pmaxcol;

#if USE_SCROLL_HINTS
    const int my_len = 2;	/* parameterize the threshold for hardscroll */
    NCURSES_SIZE_T displaced;
    bool wide;
#endif

    T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"),
       win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));

    if (win == 0)
	returnCode(ERR);

    if (!(win->_flags & _ISPAD))
	returnCode(ERR);

    /* negative values are interpreted as zero */
    if (pminrow < 0)
	pminrow = 0;
    if (pmincol < 0)
	pmincol = 0;
    if (sminrow < 0)
	sminrow = 0;
    if (smincol < 0)
	smincol = 0;

    pmaxrow = pminrow + smaxrow - sminrow;
    pmaxcol = pmincol + smaxcol - smincol;

    T((" pminrow + smaxrow - sminrow %d, win->_maxy %d", pmaxrow, win->_maxy));
    T((" pmincol + smaxcol - smincol %d, win->_maxx %d", pmaxcol, win->_maxx));

    /*
     * Trim the caller's screen size back to the actual limits.
     */
    if (pmaxrow > win->_maxy) {
	smaxrow -= (pmaxrow - win->_maxy);
	pmaxrow = pminrow + smaxrow - sminrow;
    }
    if (pmaxcol > win->_maxx) {
	smaxcol -= (pmaxcol - win->_maxx);
	pmaxcol = pmincol + smaxcol - smincol;
    }

    if (smaxrow > screen_lines
	|| smaxcol > screen_columns
	|| sminrow > smaxrow
	|| smincol > smaxcol)
	returnCode(ERR);

    T(("pad being refreshed"));

#if USE_SCROLL_HINTS
    if (win->_pad._pad_y >= 0) {
	displaced = pminrow - win->_pad._pad_y
	    - (sminrow - win->_pad._pad_top);
	T(("pad being shifted by %d line(s)", displaced));
    } else
	displaced = 0;
#endif

    /*
     * For pure efficiency, we'd want to transfer scrolling information
     * from the pad to newscr whenever the window is wide enough that
     * its update will dominate the cost of the update for the horizontal
     * band of newscr that it occupies.  Unfortunately, this threshold
     * tends to be complex to estimate, and in any case scrolling the
     * whole band and rewriting the parts outside win's image would look
     * really ugly.  So.  What we do is consider the pad "wide" if it
     * either (a) occupies the whole width of newscr, or (b) occupies
     * all but at most one column on either vertical edge of the screen
     * (this caters to fussy people who put boxes around full-screen
     * windows).  Note that changing this formula will not break any code,
     * merely change the costs of various update cases.
     */
#if USE_SCROLL_HINTS
    wide = (smincol < my_len && smaxcol > (newscr->_maxx - my_len));
#endif

    for (i = pminrow, m = sminrow + win->_yoffset;
	 i <= pmaxrow && m <= newscr->_maxy;
	 i++, m++) {
	register struct ldat *nline = &newscr->_line[m];
	register struct ldat *oline = &win->_line[i];
	NCURSES_CH_T ch;

	/*
	 * Special case for leftmost character of the displayed area.
	 * Only half of a double-width character may be visible.
	 */
	ch = oline->text[pmincol];
	if_WIDEC(isnac(ch)) {
	    SetChar(ch, L(' '), AttrOf(oline->text[pmincol - 1]));
	}
	if (!CharEq(ch, nline->text[smincol])) {
	    nline->text[smincol] = ch;
	    CHANGED_CELL(nline, smincol);
	}

	for (j = pmincol + 1, n = smincol + 1; j <= pmaxcol; j++, n++) {
	    if (!CharEq(oline->text[j], nline->text[n])) {
		nline->text[n] = oline->text[j];
		CHANGED_CELL(nline, n);
	    }
	}

#if USE_SCROLL_HINTS
	if (wide) {
	    int nind = m + displaced;
	    if (oline->oldindex < 0
		|| nind < sminrow
		|| nind > smaxrow) {
		nind = _NEWINDEX;
	    } else if (displaced) {
		register struct ldat *pline = &curscr->_line[nind];
		for (j = 0; j <= my_len; j++) {
		    int k = newscr->_maxx - j;
		    if (pline->text[j] != nline->text[j]
			|| pline->text[k] != nline->text[k]) {
			nind = _NEWINDEX;
			break;
		    }
		}
	    }

	    nline->oldindex = nind;
	}
#endif /* USE_SCROLL_HINTS */
	oline->firstchar = oline->lastchar = _NOCHANGE;
	if_USE_SCROLL_HINTS(oline->oldindex = i);
    }

    /*
     * Clean up debris from scrolling or resizing the pad, so we do not
     * accidentally pick up the index value during the next call to this
     * procedure.  The only rows that should have an index value are those
     * that are displayed during this cycle.
     */
#if USE_SCROLL_HINTS
    for (i = pminrow - 1; (i >= 0) && (win->_line[i].oldindex >= 0); i--)
	win->_line[i].oldindex = _NEWINDEX;
    for (i = pmaxrow + 1; (i <= win->_maxy)
	 && (win->_line[i].oldindex >= 0); i++)
	win->_line[i].oldindex = _NEWINDEX;
#endif

    win->_begx = smincol;
    win->_begy = sminrow;

    if (win->_clear) {
	win->_clear = FALSE;
	newscr->_clear = TRUE;
    }

    /*
     * Use the pad's current position, if it will be visible.
     * If not, don't do anything; it's not an error.
     */
    if (win->_leaveok == FALSE
	&& win->_cury >= pminrow
	&& win->_curx >= pmincol
	&& win->_cury <= pmaxrow
	&& win->_curx <= pmaxcol) {
	newscr->_cury = win->_cury - pminrow + win->_begy + win->_yoffset;
	newscr->_curx = win->_curx - pmincol + win->_begx;
    }
    newscr->_leaveok = win->_leaveok;
    win->_flags &= ~_HASMOVED;

    /*
     * Update our cache of the line-numbers that we displayed from the pad.
     * We will use this on subsequent calls to this function to derive
     * values to stuff into 'oldindex[]' -- for scrolling optimization.
     */
    win->_pad._pad_y = pminrow;
    win->_pad._pad_x = pmincol;
    win->_pad._pad_top = sminrow;
    win->_pad._pad_left = smincol;
    win->_pad._pad_bottom = smaxrow;
    win->_pad._pad_right = smaxcol;

    returnCode(OK);
}

NCURSES_EXPORT(int)
pechochar(WINDOW *pad, const chtype ch)
{
    T((T_CALLED("pechochar(%p, %s)"), pad, _tracechtype(ch)));

    if (pad == 0)
	returnCode(ERR);

    if (!(pad->_flags & _ISPAD))
	returnCode(wechochar(pad, ch));

    waddch(pad, ch);
    prefresh(pad, pad->_pad._pad_y,
	     pad->_pad._pad_x,
	     pad->_pad._pad_top,
	     pad->_pad._pad_left,
	     pad->_pad._pad_bottom,
	     pad->_pad._pad_right);

    returnCode(OK);
}