1 /* $OpenBSD: lib_refresh.c,v 1.4 2001/01/22 18:01:43 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 1.28 2000/12/10 02:43:27 tom Exp $") 46 47 NCURSES_EXPORT(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 NCURSES_EXPORT(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 #if USE_SCROLL_HINTS 81 bool wide; 82 #endif 83 84 T((T_CALLED("wnoutrefresh(%p)"), win)); 85 #ifdef TRACE 86 if (_nc_tracing & TRACE_UPDATE) 87 _tracedump("...win", win); 88 #endif /* TRACE */ 89 90 /* 91 * This function will break badly if we try to refresh a pad. 92 */ 93 if ((win == 0) 94 || (win->_flags & _ISPAD)) 95 returnCode(ERR); 96 97 /* put them here so "win == 0" won't break our code */ 98 begx = win->_begx; 99 begy = win->_begy; 100 101 newscr->_bkgd = win->_bkgd; 102 newscr->_attrs = win->_attrs; 103 104 /* merge in change information from all subwindows of this window */ 105 wsyncdown(win); 106 107 #if USE_SCROLL_HINTS 108 /* 109 * For pure efficiency, we'd want to transfer scrolling information 110 * from the window to newscr whenever the window is wide enough that 111 * its update will dominate the cost of the update for the horizontal 112 * band of newscr that it occupies. Unfortunately, this threshold 113 * tends to be complex to estimate, and in any case scrolling the 114 * whole band and rewriting the parts outside win's image would look 115 * really ugly. So. What we do is consider the window "wide" if it 116 * either (a) occupies the whole width of newscr, or (b) occupies 117 * all but at most one column on either vertical edge of the screen 118 * (this caters to fussy people who put boxes around full-screen 119 * windows). Note that changing this formula will not break any code, 120 * merely change the costs of various update cases. 121 */ 122 wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1)); 123 #endif 124 125 win->_flags &= ~_HASMOVED; 126 127 /* 128 * Microtweaking alert! This double loop is one of the genuine 129 * hot spots in the code. Even gcc doesn't seem to do enough 130 * common-subexpression chunking to make it really tense, 131 * so we'll force the issue. 132 */ 133 134 /* limit(n) */ 135 limit_x = win->_maxx; 136 /* limit(j) */ 137 if (limit_x > win->_maxx) 138 limit_x = win->_maxx; 139 140 for (i = 0, m = begy + win->_yoffset; 141 i <= win->_maxy && m <= newscr->_maxy; 142 i++, m++) { 143 register struct ldat *nline = &newscr->_line[m]; 144 register struct ldat *oline = &win->_line[i]; 145 146 if (oline->firstchar != _NOCHANGE) { 147 int last = oline->lastchar; 148 149 if (last > limit_x) 150 last = limit_x; 151 152 for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) { 153 if (oline->text[j] != nline->text[n]) { 154 nline->text[n] = oline->text[j]; 155 CHANGED_CELL(nline, n); 156 } 157 } 158 159 } 160 #if USE_SCROLL_HINTS 161 if (wide) { 162 int oind = oline->oldindex; 163 164 nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind 165 + win->_yoffset; 166 } 167 #endif /* USE_SCROLL_HINTS */ 168 169 oline->firstchar = oline->lastchar = _NOCHANGE; 170 if_USE_SCROLL_HINTS(oline->oldindex = i); 171 } 172 173 if (win->_clear) { 174 win->_clear = FALSE; 175 newscr->_clear = TRUE; 176 } 177 178 if (!win->_leaveok) { 179 newscr->_cury = win->_cury + win->_begy + win->_yoffset; 180 newscr->_curx = win->_curx + win->_begx; 181 } 182 newscr->_leaveok = win->_leaveok; 183 184 #ifdef TRACE 185 if (_nc_tracing & TRACE_UPDATE) 186 _tracedump("newscr", newscr); 187 #endif /* TRACE */ 188 returnCode(OK); 189 } 190