1 /****************************************************************************
2 * Copyright (c) 1998-2009,2013 Free Software Foundation, Inc. *
3 * *
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6 * "Software"), to deal in the Software without restriction, including *
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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. *
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23 * Except as contained in this notice, the name(s) of the above copyright *
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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
43 MODULE_ID("$Id: lib_overlay.c,v 1.31 2013/04/06 23:47:13 tom Exp $")
44
45 static int
overlap(const WINDOW * const src,WINDOW * const dst,int const flag)46 overlap(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
110 NCURSES_EXPORT(int)
overlay(const WINDOW * win1,WINDOW * win2)111 overlay(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
127 NCURSES_EXPORT(int)
overwrite(const WINDOW * win1,WINDOW * win2)128 overwrite(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
134 NCURSES_EXPORT(int)
copywin(const WINDOW * src,WINDOW * dst,int sminrow,int smincol,int dminrow,int dmincol,int dmaxrow,int dmaxcol,int over)135 copywin(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