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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 1.32 2016/05/28 23:11:26 tom Exp $")
46 overlap(const WINDOW *const src, WINDOW *const dst, int const flag)
50 T((T_CALLED("overlap(%p,%p,%d)"), (const void *) src, (void *) dst, flag));
52 if (src != 0 && dst != 0) {
53 int sx1, sy1, sx2, sy2;
54 int dx1, dy1, dx2, dy2;
56 _nc_lock_global(curses);
58 T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld",
63 T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld",
71 sx2 = sx1 + src->_maxx;
72 sy2 = sy1 + src->_maxy;
76 dx2 = dx1 + dst->_maxx;
77 dy2 = dy1 + dst->_maxy;
79 if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) {
80 int sminrow = max(sy1, dy1) - sy1;
81 int smincol = max(sx1, dx1) - sx1;
82 int dminrow = max(sy1, dy1) - dy1;
83 int dmincol = max(sx1, dx1) - dx1;
84 int dmaxrow = min(sy2, dy2) - dy1;
85 int dmaxcol = min(sx2, dx2) - dx1;
87 rc = copywin(src, dst,
93 _nc_unlock_global(curses);
100 ** overlay(win1, win2)
103 ** overlay() writes the overlapping area of win1 behind win2
104 ** on win2 non-destructively.
109 overlay(const WINDOW *win1, WINDOW *win2)
111 T((T_CALLED("overlay(%p,%p)"), (const void *) win1, (void *) win2));
112 returnCode(overlap(win1, win2, TRUE));
117 ** overwrite(win1, win2)
120 ** overwrite() writes the overlapping area of win1 behind win2
121 ** on win2 destructively.
126 overwrite(const WINDOW *win1, WINDOW *win2)
128 T((T_CALLED("overwrite(%p,%p)"), (const void *) win1, (void *) win2));
129 returnCode(overlap(win1, win2, FALSE));
133 copywin(const WINDOW *src, WINDOW *dst,
134 int sminrow, int smincol,
135 int dminrow, int dmincol,
136 int dmaxrow, int dmaxcol,
141 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
146 dmaxrow, dmaxcol, over));
150 && dmaxrow >= dminrow
151 && dmaxcol >= dmincol) {
155 _nc_lock_global(curses);
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) {
171 T(("rectangle fits in destination"));
173 for (dy = dminrow, sy = sminrow;
178 if (dy < 0 || sy < 0)
182 for (dx = dmincol, sx = smincol;
186 if (dx < 0 || sx < 0)
191 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
192 (!CharEq(dst->_line[dy].text[dx],
193 src->_line[sy].text[sx]))) {
194 dst->_line[dy].text[dx] =
195 src->_line[sy].text[sx];
196 SetAttr(dst->_line[dy].text[dx],
197 ((AttrOf(src->_line[sy].text[sx]) &
202 if (!CharEq(dst->_line[dy].text[dx],
203 src->_line[sy].text[sx])) {
204 dst->_line[dy].text[dx] =
205 src->_line[sy].text[sx];
211 touchline(dst, dminrow, (dmaxrow - dminrow + 1));
214 T(("finished copywin"));
219 _nc_unlock_global(curses);