diff options
Diffstat (limited to 'ncurses-5.3/ncurses/base/lib_refresh.c')
| -rw-r--r-- | ncurses-5.3/ncurses/base/lib_refresh.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/ncurses-5.3/ncurses/base/lib_refresh.c b/ncurses-5.3/ncurses/base/lib_refresh.c new file mode 100644 index 0000000..e9c5fdf --- /dev/null +++ b/ncurses-5.3/ncurses/base/lib_refresh.c @@ -0,0 +1,187 @@ +/**************************************************************************** + * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc. * + * * + * Permission is hereby granted, free of charge, to any person obtaining a * + * copy of this software and associated documentation files (the * + * "Software"), to deal in the Software without restriction, including * + * without limitation the rights to use, copy, modify, merge, publish, * + * distribute, distribute with modifications, sublicense, and/or sell * + * copies of the Software, and to permit persons to whom the Software is * + * furnished to do so, subject to the following conditions: * + * * + * The above copyright notice and this permission notice shall be included * + * in all copies or substantial portions of the Software. * + * * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * + * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * + * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * + * * + * Except as contained in this notice, the name(s) of the above copyright * + * holders shall not be used in advertising or otherwise to promote the * + * sale, use or other dealings in this Software without prior written * + * authorization. * + ****************************************************************************/ + +/**************************************************************************** + * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * + * and: Eric S. Raymond <esr@snark.thyrsus.com> * + ****************************************************************************/ + +/* + * lib_refresh.c + * + * The routines wrefresh() and wnoutrefresh(). + * + */ + +#include <curses.priv.h> + +MODULE_ID("$Id$") + +NCURSES_EXPORT(int) +wrefresh(WINDOW *win) +{ + int code; + + T((T_CALLED("wrefresh(%p)"), win)); + + if (win == curscr) { + curscr->_clear = TRUE; + code = doupdate(); + } else if ((code = wnoutrefresh(win)) == OK) { + if (win->_clear) + newscr->_clear = TRUE; + code = doupdate(); + /* + * Reset the clearok() flag in case it was set for the special + * case in hardscroll.c (if we don't reset it here, we'll get 2 + * refreshes because the flag is copied from stdscr to newscr). + * Resetting the flag shouldn't do any harm, anyway. + */ + win->_clear = FALSE; + } + returnCode(code); +} + +NCURSES_EXPORT(int) +wnoutrefresh(WINDOW *win) +{ + NCURSES_SIZE_T limit_x; + NCURSES_SIZE_T i, j; + NCURSES_SIZE_T begx; + NCURSES_SIZE_T begy; + NCURSES_SIZE_T m, n; +#if USE_SCROLL_HINTS + bool wide; +#endif + + T((T_CALLED("wnoutrefresh(%p)"), win)); +#ifdef TRACE + if (_nc_tracing & TRACE_UPDATE) + _tracedump("...win", win); +#endif /* TRACE */ + + /* + * This function will break badly if we try to refresh a pad. + */ + if ((win == 0) + || (win->_flags & _ISPAD)) + returnCode(ERR); + + /* put them here so "win == 0" won't break our code */ + begx = win->_begx; + begy = win->_begy; + + newscr->_nc_bkgd = win->_nc_bkgd; + newscr->_attrs = win->_attrs; + + /* merge in change information from all subwindows of this window */ + wsyncdown(win); + +#if USE_SCROLL_HINTS + /* + * For pure efficiency, we'd want to transfer scrolling information + * from the window to newscr whenever the window is wide enough that + * its update will dominate the cost of the update for the horizontal + * band of newscr that it occupies. Unfortunately, this threshold + * tends to be complex to estimate, and in any case scrolling the + * whole band and rewriting the parts outside win's image would look + * really ugly. So. What we do is consider the window "wide" if it + * either (a) occupies the whole width of newscr, or (b) occupies + * all but at most one column on either vertical edge of the screen + * (this caters to fussy people who put boxes around full-screen + * windows). Note that changing this formula will not break any code, + * merely change the costs of various update cases. + */ + wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1)); +#endif + + win->_flags &= ~_HASMOVED; + + /* + * Microtweaking alert! This double loop is one of the genuine + * hot spots in the code. Even gcc doesn't seem to do enough + * common-subexpression chunking to make it really tense, + * so we'll force the issue. + */ + + /* limit(n) */ + limit_x = win->_maxx; + /* limit(j) */ + if (limit_x > newscr->_maxx - begx) + limit_x = newscr->_maxx - begx; + + for (i = 0, m = begy + win->_yoffset; + i <= win->_maxy && m <= newscr->_maxy; + i++, m++) { + register struct ldat *nline = &newscr->_line[m]; + register struct ldat *oline = &win->_line[i]; + + if (oline->firstchar != _NOCHANGE) { + int last = oline->lastchar; + + if (last > limit_x) + last = limit_x; + + for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) { + if (!CharEq(oline->text[j], nline->text[n])) { + nline->text[n] = oline->text[j]; + CHANGED_CELL(nline, n); + } + } + + } +#if USE_SCROLL_HINTS + if (wide) { + int oind = oline->oldindex; + + nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind + + win->_yoffset; + } +#endif /* USE_SCROLL_HINTS */ + + oline->firstchar = oline->lastchar = _NOCHANGE; + if_USE_SCROLL_HINTS(oline->oldindex = i); + } + + if (win->_clear) { + win->_clear = FALSE; + newscr->_clear = TRUE; + } + + if (!win->_leaveok) { + newscr->_cury = win->_cury + win->_begy + win->_yoffset; + newscr->_curx = win->_curx + win->_begx; + } + newscr->_leaveok = win->_leaveok; + +#ifdef TRACE + if (_nc_tracing & TRACE_UPDATE) + _tracedump("newscr", newscr); +#endif /* TRACE */ + returnCode(OK); +} |