diff options
Diffstat (limited to 'lib/libcurses/lib_refresh.c')
| -rw-r--r-- | lib/libcurses/lib_refresh.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/lib/libcurses/lib_refresh.c b/lib/libcurses/lib_refresh.c new file mode 100644 index 00000000000..1dfa1a94355 --- /dev/null +++ b/lib/libcurses/lib_refresh.c @@ -0,0 +1,141 @@ + +/*************************************************************************** +* COPYRIGHT NOTICE * +**************************************************************************** +* ncurses is copyright (C) 1992-1995 * +* Zeyd M. Ben-Halim * +* zmbenhal@netcom.com * +* Eric S. Raymond * +* esr@snark.thyrsus.com * +* * +* Permission is hereby granted to reproduce and distribute ncurses * +* by any means and for any fee, whether alone or as part of a * +* larger distribution, in source or in binary form, PROVIDED * +* this notice is included with any such distribution, and is not * +* removed from any of its header files. Mention of ncurses in any * +* applications linked with it is highly appreciated. * +* * +* ncurses comes AS IS with no warranty, implied or expressed. * +* * +***************************************************************************/ + + + +/* + * lib_refresh.c + * + * The routines wredrawln(), wrefresh() and wnoutrefresh(). + * + */ + +#include "curses.priv.h" + +int wredrawln(WINDOW *win, int beg, int num) +{ + T(("wredrawln(%p,%d,%d) called", win, beg, num)); + touchline(win, beg, num); + wrefresh(win); + return OK; +} + +int wrefresh(WINDOW *win) +{ + T(("wrefresh(%p) called", win)); + + if (win == curscr) + curscr->_clear = TRUE; + else + wnoutrefresh(win); + return(doupdate()); +} + +int wnoutrefresh(WINDOW *win) +{ +short i, j; +short begx = win->_begx; +short begy = win->_begy; +short m, n; +bool wide; + + T(("wnoutrefresh(%p) called", win)); + + /* + * If 'newscr' has a different background than the window that we're + * trying to refresh, we'll have to copy the whole thing. + */ + if (win->_bkgd != newscr->_bkgd) { + touchwin(win); + newscr->_bkgd = win->_bkgd; + } + + /* merge in change information from all subwindows of this window */ + wsyncdown(win); + + /* + * 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)); + + 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. + */ + for (i = 0, m = begy; 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) { + + for (j = oline->firstchar, n = j + begx; j <= oline->lastchar; j++, n++) { + if (oline->text[j] != nline->text[n]) { + nline->text[n] = oline->text[j]; + + if (nline->firstchar == _NOCHANGE) + nline->firstchar = nline->lastchar = n; + else if (n < nline->firstchar) + nline->firstchar = n; + else if (n > nline->lastchar) + nline->lastchar = n; + } + } + + } + + if (wide) { + int oind = oline->oldindex; + + nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind; + } + + oline->firstchar = oline->lastchar = _NOCHANGE; + oline->oldindex = i; + } + + if (win->_clear) { + win->_clear = FALSE; +#if 0 + newscr->_clear = TRUE; +#endif + } + + if (! win->_leaveok) { + newscr->_cury = win->_cury + win->_begy; + newscr->_curx = win->_curx + win->_begx; + } + return(OK); +} |