1 /* $OpenBSD: lib_refresh.c,v 1.1 1999/01/18 19:09:57 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 33 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 34 ****************************************************************************/ 35 36 37 38 /* 39 * lib_refresh.c 40 * 41 * The routines wrefresh() and wnoutrefresh(). 42 * 43 */ 44 45 #include <curses.priv.h> 46 47 MODULE_ID("$From: lib_refresh.c,v 1.23 1998/06/28 00:10:14 tom Exp $") 48 49 int wrefresh(WINDOW *win) 50 { 51 int code; 52 53 T((T_CALLED("wrefresh(%p)"), win)); 54 55 if (win == curscr) { 56 curscr->_clear = TRUE; 57 code = doupdate(); 58 } else if ((code = wnoutrefresh(win)) == OK) { 59 if (win->_clear) 60 newscr->_clear = TRUE; 61 code = doupdate(); 62 /* 63 * Reset the clearok() flag in case it was set for the special 64 * case in hardscroll.c (if we don't reset it here, we'll get 2 65 * refreshes because the flag is copied from stdscr to newscr). 66 * Resetting the flag shouldn't do any harm, anyway. 67 */ 68 win->_clear = FALSE; 69 } 70 returnCode(code); 71 } 72 73 int wnoutrefresh(WINDOW *win) 74 { 75 short limit_x; 76 short i, j; 77 short begx; 78 short begy; 79 short m, n; 80 bool wide; 81 82 T((T_CALLED("wnoutrefresh(%p)"), win)); 83 #ifdef TRACE 84 if (_nc_tracing & TRACE_UPDATE) 85 _tracedump("...win", win); 86 #endif /* TRACE */ 87 88 /* 89 * This function will break badly if we try to refresh a pad. 90 */ 91 if ((win == 0) 92 || (win->_flags & _ISPAD)) 93 returnCode(ERR); 94 95 /* put them here so "win == 0" won't break our code */ 96 begx = win->_begx; 97 begy = win->_begy; 98 99 /* 100 * If 'newscr' has a different background than the window that we're 101 * trying to refresh, we'll have to copy the whole thing. 102 */ 103 if (win->_bkgd != newscr->_bkgd) { 104 touchwin(win); 105 newscr->_bkgd = win->_bkgd; 106 } 107 newscr->_attrs = win->_attrs; 108 109 /* merge in change information from all subwindows of this window */ 110 wsyncdown(win); 111 112 /* 113 * For pure efficiency, we'd want to transfer scrolling information 114 * from the window to newscr whenever the window is wide enough that 115 * its update will dominate the cost of the update for the horizontal 116 * band of newscr that it occupies. Unfortunately, this threshold 117 * tends to be complex to estimate, and in any case scrolling the 118 * whole band and rewriting the parts outside win's image would look 119 * really ugly. So. What we do is consider the window "wide" if it 120 * either (a) occupies the whole width of newscr, or (b) occupies 121 * all but at most one column on either vertical edge of the screen 122 * (this caters to fussy people who put boxes around full-screen 123 * windows). Note that changing this formula will not break any code, 124 * merely change the costs of various update cases. 125 */ 126 wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1)); 127 128 win->_flags &= ~_HASMOVED; 129 130 /* 131 * Microtweaking alert! This double loop is one of the genuine 132 * hot spots in the code. Even gcc doesn't seem to do enough 133 * common-subexpression chunking to make it really tense, 134 * so we'll force the issue. 135 */ 136 137 /* limit(n) */ 138 limit_x = win->_maxx; 139 /* limit(j) */ 140 if (limit_x > win->_maxx) 141 limit_x = win->_maxx; 142 143 for (i = 0, m = begy + win->_yoffset; 144 i <= win->_maxy && m <= newscr->_maxy; 145 i++, m++) { 146 register struct ldat *nline = &newscr->_line[m]; 147 register struct ldat *oline = &win->_line[i]; 148 149 if (oline->firstchar != _NOCHANGE) { 150 int last = oline->lastchar; 151 152 if (last > limit_x) 153 last = limit_x; 154 155 for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) { 156 if (oline->text[j] != nline->text[n]) { 157 nline->text[n] = oline->text[j]; 158 CHANGED_CELL(nline, n); 159 } 160 } 161 162 } 163 164 #if USE_SCROLL_HINTS 165 if (wide) { 166 int oind = oline->oldindex; 167 168 nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind + win->_yoffset; 169 } 170 #endif /* USE_SCROLL_HINTS */ 171 172 oline->firstchar = oline->lastchar = _NOCHANGE; 173 if_USE_SCROLL_HINTS(oline->oldindex = i); 174 } 175 176 if (win->_clear) { 177 win->_clear = FALSE; 178 newscr->_clear = TRUE; 179 } 180 181 if (! win->_leaveok) { 182 newscr->_cury = win->_cury + win->_begy + win->_yoffset; 183 newscr->_curx = win->_curx + win->_begx; 184 } 185 newscr->_leaveok = win->_leaveok; 186 187 #ifdef TRACE 188 if (_nc_tracing & TRACE_UPDATE) 189 _tracedump("newscr", newscr); 190 #endif /* TRACE */ 191 returnCode(OK); 192 } 193