lib/libcurses/touchwin.c

   1 /*      $NetBSD: touchwin.c,v 1.24 2007/05/28 15:01:58 blymn Exp $      */
   2
   3 /*
   4  * Copyright (c) 1981, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)touchwin.c  8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: touchwin.c,v 1.24 2007/05/28 15:01:58 blymn Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include "curses.h"
  42 #include "curses_private.h"
  43
  44 /*
  45  * is_linetouched --
  46  *      Indicate if line has been touched or not.
  47  */
  48 bool
  49 is_linetouched(WINDOW *win, int line)
  50 {
  51         if (line > win->maxy)
  52                 return FALSE;
  53
  54         return ((win->alines[line]->flags & __ISDIRTY) != 0);
  55 }
  56
  57 /*
  58  * touchline --
  59  *      Touch count lines starting at start.  This is the SUS v2 compliant
  60  *      version.
  61  */
  62 int
  63 touchline(WINDOW *win, int start, int count)
  64 {
  65 #ifdef DEBUG
  66         __CTRACE(__CTRACE_LINE, "touchline: (%p, %d, %d)\n", win, start, count);
  67 #endif
  68         return wtouchln(win, start, count, 1);
  69 }
  70
  71 /*
  72  * wredrawln --
  73  *      Mark count lines starting at start as corrupted.  Implemented using
  74  *      wtouchln().
  75  */
  76 int wredrawln(WINDOW *win, int start, int count)
  77 {
  78 #ifdef DEBUG
  79         __CTRACE(__CTRACE_LINE, "wredrawln: (%p, %d, %d)\n", win, start, count);
  80 #endif
  81         return wtouchln(win, start, count, 1);
  82 }
  83
  84 /*
  85  * is_wintouched --
  86  *      Check if the window has been touched.
  87  */
  88 bool
  89 is_wintouched(WINDOW *win)
  90 {
  91         int y, maxy;
  92
  93         maxy = win->maxy;
  94         for (y = 0; y < maxy; y++) {
  95                 if (is_linetouched(win, y) == TRUE)
  96                         return TRUE;
  97         }
  98
  99         return FALSE;
 100 }
 101
 102 /*
 103  * touchwin --
 104  *      Make it look like the whole window has been changed.
 105  */
 106 int
 107 touchwin(WINDOW *win)
 108 {
 109 #ifdef DEBUG
 110         __CTRACE(__CTRACE_LINE, "touchwin: (%p)\n", win);
 111 #endif
 112         return wtouchln(win, 0, win->maxy, 1);
 113 }
 114
 115 /*
 116  * redrawwin --
 117  *      Mark entire window as corrupted.  Implemented using wtouchln().
 118  */
 119 int
 120 redrawwin(WINDOW *win)
 121 {
 122 #ifdef DEBUG
 123         __CTRACE(__CTRACE_LINE, "redrawwin: (%p)\n", win);
 124 #endif
 125         return wtouchln(win, 0, win->maxy, 1);
 126 }
 127
 128 /*
 129  * untouchwin --
 130  *       Make it look like the window has not been changed.
 131  */
 132 int
 133 untouchwin(WINDOW *win)
 134 {
 135 #ifdef DEBUG
 136         __CTRACE(__CTRACE_LINE, "untouchwin: (%p)\n", win);
 137 #endif
 138         return wtouchln(win, 0, win->maxy, 0);
 139 }
 140
 141 /*
 142  * wtouchln --
 143  *      If changed is 1 then touch n lines starting at line.  If changed
 144  *      is 0 then mark the lines as unchanged.
 145  */
 146 int
 147 wtouchln(WINDOW *win, int line, int n, int changed)
 148 {
 149         int     y;
 150         __LINE  *wlp;
 151
 152 #ifdef DEBUG
 153         __CTRACE(__CTRACE_LINE, "wtouchln: (%p) %d, %d, %d\n",
 154             win, line, n, changed);
 155 #endif
 156         if (line + n > win->maxy)
 157                 line = win->maxy - n;
 158         for (y = line; y < line + n; y++) {
 159                 if (changed == 1)
 160                         __touchline(win, y, 0, (int) win->maxx - 1);
 161                 else {
 162                         wlp = win->alines[y];
 163                         if (*wlp->firstchp >= win->ch_off &&
 164                             *wlp->firstchp < win->maxx + win->ch_off)
 165                                 *wlp->firstchp = win->maxx + win->ch_off;
 166                         if (*wlp->lastchp >= win->ch_off &&
 167                             *wlp->lastchp < win->maxx + win->ch_off)
 168                                 *wlp->lastchp = win->ch_off;
 169                         wlp->flags &= ~__ISDIRTY;
 170                 }
 171         }
 172
 173         return OK;
 174 }
 175
 176 int
 177 __touchwin(WINDOW *win)
 178 {
 179         int      y, maxy;
 180
 181 #ifdef DEBUG
 182         __CTRACE(__CTRACE_LINE, "__touchwin: (%p)\n", win);
 183 #endif
 184         maxy = win->maxy;
 185         for (y = 0; y < maxy; y++)
 186                 __touchline(win, y, 0, (int) win->maxx - 1);
 187         return (OK);
 188 }
 189
 190 int
 191 __touchline(WINDOW *win, int y, int sx, int ex)
 192 {
 193 #ifdef DEBUG
 194         __CTRACE(__CTRACE_LINE, "__touchline: (%p, %d, %d, %d)\n",
 195             win, y, sx, ex);
 196         __CTRACE(__CTRACE_LINE, "__touchline: first = %d, last = %d\n",
 197             *win->alines[y]->firstchp, *win->alines[y]->lastchp);
 198 #endif
 199         sx += win->ch_off;
 200         ex += win->ch_off;
 201         if (!(win->alines[y]->flags & __ISDIRTY))
 202                 win->alines[y]->flags |= __ISDIRTY;
 203         /* firstchp/lastchp are shared between parent window and sub-window. */
 204         if (*win->alines[y]->firstchp > sx)
 205                 *win->alines[y]->firstchp = sx;
 206         if (*win->alines[y]->lastchp < ex)
 207                 *win->alines[y]->lastchp = ex;
 208 #ifdef DEBUG
 209         __CTRACE(__CTRACE_LINE, "__touchline: first = %d, last = %d\n",
 210             *win->alines[y]->firstchp, *win->alines[y]->lastchp);
 211 #endif
 212         return (OK);
 213 }