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overlay.c revision 1.1 
      1 /*
      2  * Copyright (c) 1981 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)overlay.c	5.6 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 # include	"curses.ext"
     39 # include	<ctype.h>
     40 
     41 # define	min(a,b)	(a < b ? a : b)
     42 # define	max(a,b)	(a > b ? a : b)
     43 
     44 /*
     45  *	This routine writes win1 on win2 non-destructively.
     46  *
     47  */
     48 overlay(win1, win2)
     49 reg WINDOW	*win1, *win2; {
     50 
     51 	reg char	*sp, *end;
     52 	reg int		x, y, endy, endx, starty, startx;
     53 	reg int 	y1,y2;
     54 
     55 # ifdef DEBUG
     56 	fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
     57 # endif
     58 	starty = max(win1->_begy, win2->_begy);
     59 	startx = max(win1->_begx, win2->_begx);
     60 	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
     61 	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
     62 # ifdef DEBUG
     63 	fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
     64 # endif
     65 	if (starty >= endy || startx >= endx)
     66 		return;
     67 	y1 = starty - win1->_begy;
     68 	y2 = starty - win2->_begy;
     69 	for (y = starty; y < endy; y++, y1++, y2++) {
     70 		end = &win1->_y[y1][endx - win1->_begx];
     71 		x = startx - win2->_begx;
     72 		for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
     73 			if (!isspace(*sp))
     74 				mvwaddch(win2, y2, x, *sp);
     75 			x++;
     76 		}
     77 	}
     78 }
     79