minix/lib/curses/refresh.c

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2005-04-21 16:53:53 +02:00
/* refresh.c */
#include <curses.h>
#include "curspriv.h"
/* Wrefresh() updates window win's area of the physical screen. */
void wrefresh(win)
WINDOW *win;
{
if (win == curscr)
curscr->_clear = TRUE;
else
wnoutrefresh(win);
doupdate();
}
/****************************************************************/
/* Wnoutrefresh() updates the image of the desired screen, */
/* Without doing physical update (copies window win's image to */
/* The _cursvar.tmpwin window, which is hidden from the user). */
/****************************************************************/
void wnoutrefresh(win)
register WINDOW *win;
{
register int *dst; /* start destination in temp window */
register int *end; /* end destination in temp window */
register int *src; /* source in user window */
register int first; /* first changed char on line */
register int last; /* last changed char on line */
WINDOW *nscr;
int begy; /* window's place on screen */
int begx;
int i;
int j;
nscr = _cursvar.tmpwin;
begy = win->_begy;
begx = win->_begx;
for (i = 0, j = begy; i <= win->_maxy; i++, j++) {
if (win->_minchng[i] != _NO_CHANGE) {
first = win->_minchng[i];
last = win->_maxchng[i];
dst = &(nscr->_line[j][begx + first]);
end = &(nscr->_line[j][begx + last]);
src = &(win->_line[i][first]);
while (dst <= end) /* copy user line to temp window */
*dst++ = *src++;
first += begx; /* nscr's min/max change positions */
last += begx;
if ((nscr->_minchng[j] == _NO_CHANGE) || (nscr->_minchng[j] > first))
nscr->_minchng[j] = first;
if (last > nscr->_maxchng[j]) nscr->_maxchng[j] = last;
win->_minchng[i] = _NO_CHANGE; /* updated now */
} /* if */
win->_maxchng[i] = _NO_CHANGE; /* updated now */
} /* for */
if (win->_clear) {
win->_clear = FALSE;
nscr->_clear = TRUE;
} /* if */
if (!win->_leave) {
nscr->_cury = win->_cury + begy;
nscr->_curx = win->_curx + begx;
} /* if */
} /* wnoutrefresh */