usr.bin/window/wwredrawwin.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwredrawwin.c    8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwredrawwin.c,v 1.1.1.1.14.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwredrawwin.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42
  43 wwredrawwin1(w, row1, row2, offset)
  44 register struct ww *w;
  45 int row1, row2, offset;
  46 {
  47         int row;
  48         register col;
  49         register char *smap;
  50         register union ww_char *buf;
  51         register char *win;
  52         register union ww_char *ns;
  53         int x;
  54         int nchanged;
  55
  56         for (row = row1; row < row2; row++) {
  57                 col = w->ww_i.l;
  58                 ns = wwns[row];
  59                 smap = &wwsmap[row][col];
  60                 buf = w->ww_buf[row + offset];
  61                 win = w->ww_win[row];
  62                 nchanged = 0;
  63                 for (; col < w->ww_i.r; col++)
  64                         if (*smap++ == w->ww_index &&
  65                             ns[col].c_w !=
  66                             (x = buf[col].c_w ^ win[col] << WWC_MSHIFT)) {
  67                                 nchanged++;
  68                                 ns[col].c_w = x;
  69                         }
  70                 if (nchanged > 0)
  71                         wwtouched[row] |= WWU_TOUCHED;
  72         }
  73 }