1/****************************************************************************
2 * Copyright (c) 1998-2009,2013 Free Software Foundation, Inc.              *
3 *                                                                          *
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5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
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8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
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26 * authorization.                                                           *
27 ****************************************************************************/
28
29/****************************************************************************
30 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32 ****************************************************************************/
33
34/*
35**	lib_overlay.c
36**
37**	The routines overlay(), copywin(), and overwrite().
38**
39*/
40
41#include <curses.priv.h>
42
43MODULE_ID("$Id: lib_overlay.c,v 1.31 2013/04/06 23:47:13 tom Exp $")
44
45static int
46overlap(const WINDOW *const src, WINDOW *const dst, int const flag)
47{
48    int rc = ERR;
49    int sx1, sy1, sx2, sy2;
50    int dx1, dy1, dx2, dy2;
51    int sminrow, smincol;
52    int dminrow, dmincol;
53    int dmaxrow, dmaxcol;
54
55    T((T_CALLED("overlap(%p,%p,%d)"), (const void *) src, (void *) dst, flag));
56
57    if (src != 0 && dst != 0) {
58	_nc_lock_global(curses);
59
60	T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld",
61	   (long) src->_begy,
62	   (long) src->_begx,
63	   (long) src->_maxy,
64	   (long) src->_maxx));
65	T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld",
66	   (long) dst->_begy,
67	   (long) dst->_begx,
68	   (long) dst->_maxy,
69	   (long) dst->_maxx));
70
71	sx1 = src->_begx;
72	sy1 = src->_begy;
73	sx2 = sx1 + src->_maxx;
74	sy2 = sy1 + src->_maxy;
75
76	dx1 = dst->_begx;
77	dy1 = dst->_begy;
78	dx2 = dx1 + dst->_maxx;
79	dy2 = dy1 + dst->_maxy;
80
81	if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) {
82	    sminrow = max(sy1, dy1) - sy1;
83	    smincol = max(sx1, dx1) - sx1;
84	    dminrow = max(sy1, dy1) - dy1;
85	    dmincol = max(sx1, dx1) - dx1;
86	    dmaxrow = min(sy2, dy2) - dy1;
87	    dmaxcol = min(sx2, dx2) - dx1;
88
89	    rc = copywin(src, dst,
90			 sminrow, smincol,
91			 dminrow, dmincol,
92			 dmaxrow, dmaxcol,
93			 flag);
94	}
95	_nc_unlock_global(curses);
96    }
97    returnCode(rc);
98}
99
100/*
101**
102**	overlay(win1, win2)
103**
104**
105**	overlay() writes the overlapping area of win1 behind win2
106**	on win2 non-destructively.
107**
108**/
109
110NCURSES_EXPORT(int)
111overlay(const WINDOW *win1, WINDOW *win2)
112{
113    T((T_CALLED("overlay(%p,%p)"), (const void *) win1, (void *) win2));
114    returnCode(overlap(win1, win2, TRUE));
115}
116
117/*
118**
119**	overwrite(win1, win2)
120**
121**
122**	overwrite() writes the overlapping area of win1 behind win2
123**	on win2 destructively.
124**
125**/
126
127NCURSES_EXPORT(int)
128overwrite(const WINDOW *win1, WINDOW *win2)
129{
130    T((T_CALLED("overwrite(%p,%p)"), (const void *) win1, (void *) win2));
131    returnCode(overlap(win1, win2, FALSE));
132}
133
134NCURSES_EXPORT(int)
135copywin(const WINDOW *src, WINDOW *dst,
136	int sminrow, int smincol,
137	int dminrow, int dmincol,
138	int dmaxrow, int dmaxcol,
139	int over)
140{
141    int rc = ERR;
142    int sx, sy, dx, dy;
143    bool touched;
144    attr_t bk;
145    attr_t mask;
146
147    T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
148       (const void *) src,
149       (void *) dst,
150       sminrow, smincol,
151       dminrow, dmincol,
152       dmaxrow, dmaxcol, over));
153
154    if (src != 0
155	&& dst != 0
156	&& dmaxrow >= dminrow
157	&& dmaxcol >= dmincol) {
158	_nc_lock_global(curses);
159
160	bk = AttrOf(dst->_nc_bkgd);
161	mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
162
163	/* make sure rectangle exists in source */
164	if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) &&
165	    (smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) {
166	    bool copied = FALSE;
167
168	    T(("rectangle exists in source"));
169
170	    /* make sure rectangle fits in destination */
171	    if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) {
172
173		T(("rectangle fits in destination"));
174
175		for (dy = dminrow, sy = sminrow;
176		     dy <= dmaxrow;
177		     sy++, dy++) {
178
179		    if (dy < 0 || sy < 0)
180			continue;
181
182		    touched = FALSE;
183		    for (dx = dmincol, sx = smincol;
184			 dx <= dmaxcol;
185			 sx++, dx++) {
186
187			if (dx < 0 || sx < 0)
188			    continue;
189			copied = TRUE;
190
191			if (over) {
192			    if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
193				(!CharEq(dst->_line[dy].text[dx],
194					 src->_line[sy].text[sx]))) {
195				dst->_line[dy].text[dx] =
196				    src->_line[sy].text[sx];
197				SetAttr(dst->_line[dy].text[dx],
198					((AttrOf(src->_line[sy].text[sx]) &
199					  mask) | bk));
200				touched = TRUE;
201			    }
202			} else {
203			    if (!CharEq(dst->_line[dy].text[dx],
204					src->_line[sy].text[sx])) {
205				dst->_line[dy].text[dx] =
206				    src->_line[sy].text[sx];
207				touched = TRUE;
208			    }
209			}
210		    }
211		    if (touched) {
212			touchline(dst, dminrow, (dmaxrow - dminrow + 1));
213		    }
214		}
215		T(("finished copywin"));
216		if (copied)
217		    rc = OK;
218	    }
219	}
220	_nc_unlock_global(curses);
221    }
222    returnCode(rc);
223}
224