usr/src/lib/libcurses/screen/overlap.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 #include        <sys/types.h>
  45 #include        "curses_inc.h"
  46
  47 /*
  48  * This routine writes Srcwin on Dstwin.
  49  * Only the overlapping region is copied.
  50  */
  51
  52 int
  53 _overlap(WINDOW *Srcwin, WINDOW *Dstwin, int Overlay)
  54 {
  55         int     sby, sbx, sey, sex, dby, dbx, dey, dex,
  56                 top, bottom, left, right;
  57
  58 #ifdef  DEBUG
  59         if (outf)
  60                 fprintf(outf, "OVERWRITE(0%o, 0%o);\n", Srcwin, Dstwin);
  61 #endif  /* DEBUG */
  62
  63         sby = Srcwin->_begy;    dby = Dstwin->_begy;
  64         sbx = Srcwin->_begx;    dbx = Dstwin->_begx;
  65         sey = sby + Srcwin->_maxy;      dey = dby + Dstwin->_maxy;
  66         sex = sbx + Srcwin->_maxx;      dex = dbx + Dstwin->_maxx;
  67
  68         if (sey < dby || sby > dey || sex < dbx || sbx > dex)
  69                 return (ERR);
  70
  71         top = _MAX(sby, dby);   bottom = _MIN(sey, dey);
  72         left = _MAX(sbx, dbx);  right = _MIN(sex, dex);
  73
  74         sby = top - sby;                sbx = left - sbx;
  75         dey = bottom - dby - 1; dex = right - dbx - 1;
  76         dby = top - dby;                dbx = left - dbx;
  77
  78         return (copywin(Srcwin, Dstwin, sby, sbx, dby, dbx, dey, dex, Overlay));
  79 }