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29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 ****************************************************************************/
37 ** The routines overlay(), copywin(), and overwrite().
41 #include <curses.priv.h>
43 MODULE_ID("$Id: lib_overlay.c,v 1.25 2008/04/12 17:21:59 tom Exp $")
46 overlap(const WINDOW *const src, WINDOW *const dst, int const flag)
49 int sx1, sy1, sx2, sy2;
50 int dx1, dy1, dx2, dy2;
55 T((T_CALLED("overlap(%p,%p,%d)"), src, dst, flag));
57 if (src != 0 && dst != 0) {
61 T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld",
66 T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld",
74 sx2 = sx1 + src->_maxx;
75 sy2 = sy1 + src->_maxy;
79 dx2 = dx1 + dst->_maxx;
80 dy2 = dy1 + dst->_maxy;
82 if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) {
83 sminrow = max(sy1, dy1) - sy1;
84 smincol = max(sx1, dx1) - sx1;
85 dminrow = max(sy1, dy1) - dy1;
86 dmincol = max(sx1, dx1) - dx1;
87 dmaxrow = min(sy2, dy2) - dy1;
88 dmaxcol = min(sx2, dx2) - dx1;
90 rc = copywin(src, dst,
96 _nc_unlock_window(dst);
97 _nc_unlock_window(src);
104 ** overlay(win1, win2)
107 ** overlay() writes the overlapping area of win1 behind win2
108 ** on win2 non-destructively.
113 overlay(const WINDOW *win1, WINDOW *win2)
115 T((T_CALLED("overlay(%p,%p)"), win1, win2));
116 returnCode(overlap(win1, win2, TRUE));
121 ** overwrite(win1, win2)
124 ** overwrite() writes the overlapping area of win1 behind win2
125 ** on win2 destructively.
130 overwrite(const WINDOW *win1, WINDOW *win2)
132 T((T_CALLED("overwrite(%p,%p)"), win1, win2));
133 returnCode(overlap(win1, win2, FALSE));
137 copywin(const WINDOW *src, WINDOW *dst,
138 int sminrow, int smincol,
139 int dminrow, int dmincol,
140 int dmaxrow, int dmaxcol,
149 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
150 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));
154 _nc_lock_window(src);
155 _nc_lock_window(dst);
157 bk = AttrOf(dst->_nc_bkgd);
158 mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
160 /* make sure rectangle exists in source */
161 if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) &&
162 (smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) {
164 T(("rectangle exists in source"));
166 /* make sure rectangle fits in destination */
167 if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) {
169 T(("rectangle fits in destination"));
171 for (dy = dminrow, sy = sminrow;
176 for (dx = dmincol, sx = smincol;
180 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
181 (!CharEq(dst->_line[dy].text[dx],
182 src->_line[sy].text[sx]))) {
183 dst->_line[dy].text[dx] =
184 src->_line[sy].text[sx];
185 SetAttr(dst->_line[dy].text[dx],
186 ((AttrOf(src->_line[sy].text[sx]) &
191 if (!CharEq(dst->_line[dy].text[dx],
192 src->_line[sy].text[sx])) {
193 dst->_line[dy].text[dx] =
194 src->_line[sy].text[sx];
200 touchline(dst, dminrow, (dmaxrow - dminrow + 1));
203 T(("finished copywin"));
207 _nc_unlock_window(dst);
208 _nc_unlock_window(src);