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27 ****************************************************************************/
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 1.21 2002/09/21 23:03:32 tom Exp $")
46 overlap(const WINDOW *const s, WINDOW *const d, int const flag)
48 int sx1, sy1, sx2, sy2;
49 int dx1, dy1, dx2, dy2;
54 T((T_CALLED("overlap(%p,%p,%d)"), s, d, flag));
56 if (s == 0 || d == 0) {
59 T(("src : begy %d, begx %d, maxy %d, maxx %d",
60 s->_begy, s->_begx, s->_maxy, s->_maxx));
61 T(("dst : begy %d, begx %d, maxy %d, maxx %d",
62 d->_begy, d->_begx, d->_maxy, d->_maxx));
74 if (dx2 < sx1 || dx1 > sx2 || dy2 < sy1 || dy1 > sy2) {
75 returnCode(ERR); /* No intersection */
77 sminrow = max(sy1, dy1) - sy1;
78 smincol = max(sx1, dx1) - sx1;
79 dminrow = max(sy1, dy1) - dy1;
80 dmincol = max(sx1, dx1) - dx1;
81 dmaxrow = min(sy2, dy2) - dy1;
82 dmaxcol = min(sx2, dx2) - dx1;
84 returnCode(copywin(s, d,
95 ** overlay(win1, win2)
98 ** overlay() writes the overlapping area of win1 behind win2
99 ** on win2 non-destructively.
104 overlay(const WINDOW *win1, WINDOW *win2)
106 T((T_CALLED("overlay(%p,%p)"), win1, win2));
107 returnCode(overlap(win1, win2, TRUE));
112 ** overwrite(win1, win2)
115 ** overwrite() writes the overlapping area of win1 behind win2
116 ** on win2 destructively.
121 overwrite(const WINDOW *win1, WINDOW *win2)
123 T((T_CALLED("overwrite(%p,%p)"), win1, win2));
124 returnCode(overlap(win1, win2, FALSE));
128 copywin(const WINDOW *src, WINDOW *dst,
129 int sminrow, int smincol,
130 int dminrow, int dmincol,
131 int dmaxrow, int dmaxcol,
136 attr_t bk = AttrOf(dst->_nc_bkgd);
137 attr_t mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
139 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
140 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));
145 /* make sure rectangle exists in source */
146 if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) ||
147 (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) {
151 T(("rectangle exists in source"));
153 /* make sure rectangle fits in destination */
154 if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) {
158 T(("rectangle fits in destination"));
160 for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) {
162 for (dx = dmincol, sx = smincol; dx <= dmaxcol; sx++, dx++) {
164 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
165 (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx]))) {
166 dst->_line[dy].text[dx] = src->_line[sy].text[sx];
167 SetAttr(dst->_line[dy].text[dx],
168 (AttrOf(src->_line[sy].text[sx]) & mask) | bk);
172 if (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx])) {
173 dst->_line[dy].text[dx] = src->_line[sy].text[sx];
179 touchline(dst, dminrow, (dmaxrow - dminrow + 1));
182 T(("finished copywin"));