1 /**************************************************************************** 2 * Copyright (c) 1998,1999,2000,2001 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 ****************************************************************************/ 33 34 /* 35 * lib_refresh.c 36 * 37 * The routines wrefresh() and wnoutrefresh(). 38 * 39 */ 40 41 #include <curses.priv.h> 42 43 MODULE_ID("$Id: lib_refresh.c,v 1.31 2001/12/19 01:06:41 tom Exp $") 44 45 NCURSES_EXPORT(int) 46 wrefresh(WINDOW *win) 47 { 48 int code; 49 50 T((T_CALLED("wrefresh(%p)"), win)); 51 52 if (win == curscr) { 53 curscr->_clear = TRUE; 54 code = doupdate(); 55 } else if ((code = wnoutrefresh(win)) == OK) { 56 if (win->_clear) 57 newscr->_clear = TRUE; 58 code = doupdate(); 59 /* 60 * Reset the clearok() flag in case it was set for the special 61 * case in hardscroll.c (if we don't reset it here, we'll get 2 62 * refreshes because the flag is copied from stdscr to newscr). 63 * Resetting the flag shouldn't do any harm, anyway. 64 */ 65 win->_clear = FALSE; 66 } 67 returnCode(code); 68 } 69 70 NCURSES_EXPORT(int) 71 wnoutrefresh(WINDOW *win) 72 { 73 NCURSES_SIZE_T limit_x; 74 NCURSES_SIZE_T i, j; 75 NCURSES_SIZE_T begx; 76 NCURSES_SIZE_T begy; 77 NCURSES_SIZE_T m, n; 78 #if USE_SCROLL_HINTS 79 bool wide; 80 #endif 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->_nc_bkgd = win->_nc_bkgd; 100 newscr->_attrs = win->_attrs; 101 102 /* merge in change information from all subwindows of this window */ 103 wsyncdown(win); 104 105 #if USE_SCROLL_HINTS 106 /* 107 * For pure efficiency, we'd want to transfer scrolling information 108 * from the window to newscr whenever the window is wide enough that 109 * its update will dominate the cost of the update for the horizontal 110 * band of newscr that it occupies. Unfortunately, this threshold 111 * tends to be complex to estimate, and in any case scrolling the 112 * whole band and rewriting the parts outside win's image would look 113 * really ugly. So. What we do is consider the window "wide" if it 114 * either (a) occupies the whole width of newscr, or (b) occupies 115 * all but at most one column on either vertical edge of the screen 116 * (this caters to fussy people who put boxes around full-screen 117 * windows). Note that changing this formula will not break any code, 118 * merely change the costs of various update cases. 119 */ 120 wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1)); 121 #endif 122 123 win->_flags &= ~_HASMOVED; 124 125 /* 126 * Microtweaking alert! This double loop is one of the genuine 127 * hot spots in the code. Even gcc doesn't seem to do enough 128 * common-subexpression chunking to make it really tense, 129 * so we'll force the issue. 130 */ 131 132 /* limit(n) */ 133 limit_x = win->_maxx; 134 /* limit(j) */ 135 if (limit_x > win->_maxx) 136 limit_x = win->_maxx; 137 138 for (i = 0, m = begy + win->_yoffset; 139 i <= win->_maxy && m <= newscr->_maxy; 140 i++, m++) { 141 register struct ldat *nline = &newscr->_line[m]; 142 register struct ldat *oline = &win->_line[i]; 143 144 if (oline->firstchar != _NOCHANGE) { 145 int last = oline->lastchar; 146 147 if (last > limit_x) 148 last = limit_x; 149 150 for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) { 151 if (!CharEq(oline->text[j], nline->text[n])) { 152 nline->text[n] = oline->text[j]; 153 CHANGED_CELL(nline, n); 154 } 155 } 156 157 } 158 #if USE_SCROLL_HINTS 159 if (wide) { 160 int oind = oline->oldindex; 161 162 nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind 163 + win->_yoffset; 164 } 165 #endif /* USE_SCROLL_HINTS */ 166 167 oline->firstchar = oline->lastchar = _NOCHANGE; 168 if_USE_SCROLL_HINTS(oline->oldindex = i); 169 } 170 171 if (win->_clear) { 172 win->_clear = FALSE; 173 newscr->_clear = TRUE; 174 } 175 176 if (!win->_leaveok) { 177 newscr->_cury = win->_cury + win->_begy + win->_yoffset; 178 newscr->_curx = win->_curx + win->_begx; 179 } 180 newscr->_leaveok = win->_leaveok; 181 182 #ifdef TRACE 183 if (_nc_tracing & TRACE_UPDATE) 184 _tracedump("newscr", newscr); 185 #endif /* TRACE */ 186 returnCode(OK); 187 } 188