usr.bin/window/wwredrawwin.c

   1 /*      $NetBSD: wwredrawwin.c,v 1.7 2003/08/07 11:17:44 agc Exp $      */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)wwredrawwin.c       8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwredrawwin.c,v 1.7 2003/08/07 11:17:44 agc Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include "ww.h"
  45
  46 void
  47 wwredrawwin1(struct ww *w, int row1, int row2, int offset)
  48 {
  49         int row;
  50         int col;
  51         unsigned char *smap;
  52         union ww_char *buf;
  53         char *win;
  54         union ww_char *ns;
  55         int x;
  56         int nchanged;
  57
  58         for (row = row1; row < row2; row++) {
  59                 col = w->ww_i.l;
  60                 ns = wwns[row];
  61                 smap = &wwsmap[row][col];
  62                 buf = w->ww_buf[row + offset];
  63                 win = w->ww_win[row];
  64                 nchanged = 0;
  65                 for (; col < w->ww_i.r; col++)
  66                         if (*smap++ == w->ww_index &&
  67                             ns[col].c_w !=
  68                             (x = buf[col].c_w ^ win[col] << WWC_MSHIFT)) {
  69                                 nchanged++;
  70                                 ns[col].c_w = x;
  71                         }
  72                 if (nchanged > 0)
  73                         wwtouched[row] |= WWU_TOUCHED;
  74         }
  75 }