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- /*
- * Copyright (c) 1981 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley. The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)overlay.c 5.5 (Berkeley) 6/30/88";
- #endif /* not lint */
-
- # include "curses.ext"
- # include <ctype.h>
-
- # define min(a,b) (a < b ? a : b)
- # define max(a,b) (a > b ? a : b)
-
- /*
- * This routine writes win1 on win2 non-destructively.
- *
- */
- void overlay(win1, win2)
- reg WINDOW *win1, *win2; {
-
- reg char *sp, *end;
- reg int x, y, endy, endx, starty, startx;
- reg int y1,y2;
-
- # ifdef DEBUG
- fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
- # endif
- starty = max(win1->_begy, win2->_begy);
- startx = max(win1->_begx, win2->_begx);
- endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
- endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
- # ifdef DEBUG
- fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
- # endif
- if (starty >= endy || startx >= endx)
- return;
- y1 = starty - win1->_begy;
- y2 = starty - win2->_begy;
- for (y = starty; y < endy; y++, y1++, y2++) {
- end = &win1->_y[y1][endx - win1->_begx];
- x = startx - win2->_begx;
- for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
- if (!isspace(*sp))
- mvwaddch(win2, y2, x, *sp);
- x++;
- }
- }
- }
-