usr.bin/window/wwredrawwin.c

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