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+/****************************************************************************
+ * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ ****************************************************************************/
+
+/*
+** lib_overlay.c
+**
+** The routines overlay(), copywin(), and overwrite().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_overlay.c,v 1.25 2008/04/12 17:21:59 tom Exp $")
+
+static int
+overlap(const WINDOW *const src, WINDOW *const dst, int const flag)
+{
+ int rc = ERR;
+ int sx1, sy1, sx2, sy2;
+ int dx1, dy1, dx2, dy2;
+ int sminrow, smincol;
+ int dminrow, dmincol;
+ int dmaxrow, dmaxcol;
+
+ T((T_CALLED("overlap(%p,%p,%d)"), src, dst, flag));
+
+ if (src != 0 && dst != 0) {
+ _nc_lock_window(src);
+ _nc_lock_window(dst);
+
+ T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld",
+ (long) src->_begy,
+ (long) src->_begx,
+ (long) src->_maxy,
+ (long) src->_maxx));
+ T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld",
+ (long) dst->_begy,
+ (long) dst->_begx,
+ (long) dst->_maxy,
+ (long) dst->_maxx));
+
+ sx1 = src->_begx;
+ sy1 = src->_begy;
+ sx2 = sx1 + src->_maxx;
+ sy2 = sy1 + src->_maxy;
+
+ dx1 = dst->_begx;
+ dy1 = dst->_begy;
+ dx2 = dx1 + dst->_maxx;
+ dy2 = dy1 + dst->_maxy;
+
+ if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) {
+ sminrow = max(sy1, dy1) - sy1;
+ smincol = max(sx1, dx1) - sx1;
+ dminrow = max(sy1, dy1) - dy1;
+ dmincol = max(sx1, dx1) - dx1;
+ dmaxrow = min(sy2, dy2) - dy1;
+ dmaxcol = min(sx2, dx2) - dx1;
+
+ rc = copywin(src, dst,
+ sminrow, smincol,
+ dminrow, dmincol,
+ dmaxrow, dmaxcol,
+ flag);
+ }
+ _nc_unlock_window(dst);
+ _nc_unlock_window(src);
+ }
+ returnCode(rc);
+}
+
+/*
+**
+** overlay(win1, win2)
+**
+**
+** overlay() writes the overlapping area of win1 behind win2
+** on win2 non-destructively.
+**
+**/
+
+NCURSES_EXPORT(int)
+overlay(const WINDOW *win1, WINDOW *win2)
+{
+ T((T_CALLED("overlay(%p,%p)"), win1, win2));
+ returnCode(overlap(win1, win2, TRUE));
+}
+
+/*
+**
+** overwrite(win1, win2)
+**
+**
+** overwrite() writes the overlapping area of win1 behind win2
+** on win2 destructively.
+**
+**/
+
+NCURSES_EXPORT(int)
+overwrite(const WINDOW *win1, WINDOW *win2)
+{
+ T((T_CALLED("overwrite(%p,%p)"), win1, win2));
+ returnCode(overlap(win1, win2, FALSE));
+}
+
+NCURSES_EXPORT(int)
+copywin(const WINDOW *src, WINDOW *dst,
+ int sminrow, int smincol,
+ int dminrow, int dmincol,
+ int dmaxrow, int dmaxcol,
+ int over)
+{
+ int rc = ERR;
+ int sx, sy, dx, dy;
+ bool touched;
+ attr_t bk;
+ attr_t mask;
+
+ T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
+ src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));
+
+ if (src && dst) {
+
+ _nc_lock_window(src);
+ _nc_lock_window(dst);
+
+ bk = AttrOf(dst->_nc_bkgd);
+ mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
+
+ /* make sure rectangle exists in source */
+ if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) &&
+ (smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) {
+
+ T(("rectangle exists in source"));
+
+ /* make sure rectangle fits in destination */
+ if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) {
+
+ T(("rectangle fits in destination"));
+
+ for (dy = dminrow, sy = sminrow;
+ dy <= dmaxrow;
+ sy++, dy++) {
+
+ touched = FALSE;
+ for (dx = dmincol, sx = smincol;
+ dx <= dmaxcol;
+ sx++, dx++) {
+ if (over) {
+ if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
+ (!CharEq(dst->_line[dy].text[dx],
+ src->_line[sy].text[sx]))) {
+ dst->_line[dy].text[dx] =
+ src->_line[sy].text[sx];
+ SetAttr(dst->_line[dy].text[dx],
+ ((AttrOf(src->_line[sy].text[sx]) &
+ mask) | bk));
+ touched = TRUE;
+ }
+ } else {
+ if (!CharEq(dst->_line[dy].text[dx],
+ src->_line[sy].text[sx])) {
+ dst->_line[dy].text[dx] =
+ src->_line[sy].text[sx];
+ touched = TRUE;
+ }
+ }
+ }
+ if (touched) {
+ touchline(dst, dminrow, (dmaxrow - dminrow + 1));
+ }
+ }
+ T(("finished copywin"));
+ rc = OK;
+ }
+ }
+ _nc_unlock_window(dst);
+ _nc_unlock_window(src);
+ }
+ returnCode(rc);
+}