1 /* $OpenBSD: lib_refresh.c,v 1.3 2000/06/19 03:53:44 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998,1999,2000 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 * lib_refresh.c 38 * 39 * The routines wrefresh() and wnoutrefresh(). 40 * 41 */ 42 43 #include <curses.priv.h> 44 45 MODULE_ID("$From: lib_refresh.c,v 1.25 2000/04/29 21:17:08 tom Exp $") 46 47 int 48 wrefresh(WINDOW *win) 49 { 50 int code; 51 52 T((T_CALLED("wrefresh(%p)"), win)); 53 54 if (win == curscr) { 55 curscr->_clear = TRUE; 56 code = doupdate(); 57 } else if ((code = wnoutrefresh(win)) == OK) { 58 if (win->_clear) 59 newscr->_clear = TRUE; 60 code = doupdate(); 61 /* 62 * Reset the clearok() flag in case it was set for the special 63 * case in hardscroll.c (if we don't reset it here, we'll get 2 64 * refreshes because the flag is copied from stdscr to newscr). 65 * Resetting the flag shouldn't do any harm, anyway. 66 */ 67 win->_clear = FALSE; 68 } 69 returnCode(code); 70 } 71 72 int 73 wnoutrefresh(WINDOW *win) 74 { 75 NCURSES_SIZE_T limit_x; 76 NCURSES_SIZE_T i, j; 77 NCURSES_SIZE_T begx; 78 NCURSES_SIZE_T begy; 79 NCURSES_SIZE_T 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 newscr->_bkgd = win->_bkgd; 100 newscr->_attrs = win->_attrs; 101 102 /* merge in change information from all subwindows of this window */ 103 wsyncdown(win); 104 105 /* 106 * For pure efficiency, we'd want to transfer scrolling information 107 * from the window to newscr whenever the window is wide enough that 108 * its update will dominate the cost of the update for the horizontal 109 * band of newscr that it occupies. Unfortunately, this threshold 110 * tends to be complex to estimate, and in any case scrolling the 111 * whole band and rewriting the parts outside win's image would look 112 * really ugly. So. What we do is consider the window "wide" if it 113 * either (a) occupies the whole width of newscr, or (b) occupies 114 * all but at most one column on either vertical edge of the screen 115 * (this caters to fussy people who put boxes around full-screen 116 * windows). Note that changing this formula will not break any code, 117 * merely change the costs of various update cases. 118 */ 119 wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1)); 120 121 win->_flags &= ~_HASMOVED; 122 123 /* 124 * Microtweaking alert! This double loop is one of the genuine 125 * hot spots in the code. Even gcc doesn't seem to do enough 126 * common-subexpression chunking to make it really tense, 127 * so we'll force the issue. 128 */ 129 130 /* limit(n) */ 131 limit_x = win->_maxx; 132 /* limit(j) */ 133 if (limit_x > win->_maxx) 134 limit_x = win->_maxx; 135 136 for (i = 0, m = begy + win->_yoffset; 137 i <= win->_maxy && m <= newscr->_maxy; 138 i++, m++) { 139 register struct ldat *nline = &newscr->_line[m]; 140 register struct ldat *oline = &win->_line[i]; 141 142 if (oline->firstchar != _NOCHANGE) { 143 int last = oline->lastchar; 144 145 if (last > limit_x) 146 last = limit_x; 147 148 for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) { 149 if (oline->text[j] != nline->text[n]) { 150 nline->text[n] = oline->text[j]; 151 CHANGED_CELL(nline, n); 152 } 153 } 154 155 } 156 #if USE_SCROLL_HINTS 157 if (wide) { 158 int oind = oline->oldindex; 159 160 nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind 161 + win->_yoffset; 162 } 163 #endif /* USE_SCROLL_HINTS */ 164 165 oline->firstchar = oline->lastchar = _NOCHANGE; 166 if_USE_SCROLL_HINTS(oline->oldindex = i); 167 } 168 169 if (win->_clear) { 170 win->_clear = FALSE; 171 newscr->_clear = TRUE; 172 } 173 174 if (!win->_leaveok) { 175 newscr->_cury = win->_cury + win->_begy + win->_yoffset; 176 newscr->_curx = win->_curx + win->_begx; 177 } 178 newscr->_leaveok = win->_leaveok; 179 180 #ifdef TRACE 181 if (_nc_tracing & TRACE_UPDATE) 182 _tracedump("newscr", newscr); 183 #endif /* TRACE */ 184 returnCode(OK); 185 } 186