lib/curses/refresh.c

   1 /* refresh.c */
   2
   3 #include <curses.h>
   4 #include "curspriv.h"
   5
   6 /* Wrefresh() updates window win's area of the physical screen. */
   7 void wrefresh(win)
   8 WINDOW *win;
   9 {
  10   if (win == curscr)
  11         curscr->_clear = TRUE;
  12   else
  13         wnoutrefresh(win);
  14   doupdate();
  15 }
  16
  17 /****************************************************************/
  18 /* Wnoutrefresh() updates the image of the desired screen,      */
  19 /* Without doing physical update (copies window win's image to  */
  20 /* The _cursvar.tmpwin window, which is hidden from the user).  */
  21 /****************************************************************/
  22
  23 void wnoutrefresh(win)
  24 register WINDOW *win;
  25 {
  26   register int *dst;            /* start destination in temp window */
  27   register int *end;            /* end destination in temp window */
  28   register int *src;            /* source in user window */
  29   register int first;           /* first changed char on line */
  30   register int last;            /* last changed char on line */
  31   WINDOW *nscr;
  32   int begy;                     /* window's place on screen */
  33   int begx;
  34   int i;
  35   int j;
  36
  37   nscr = _cursvar.tmpwin;
  38   begy = win->_begy;
  39   begx = win->_begx;
  40
  41   for (i = 0, j = begy; i <= win->_maxy; i++, j++) {
  42         if (win->_minchng[i] != _NO_CHANGE) {
  43                 first = win->_minchng[i];
  44                 last = win->_maxchng[i];
  45                 dst = &(nscr->_line[j][begx + first]);
  46                 end = &(nscr->_line[j][begx + last]);
  47                 src = &(win->_line[i][first]);
  48
  49                 while (dst <= end)      /* copy user line to temp window */
  50                         *dst++ = *src++;
  51
  52                 first += begx;  /* nscr's min/max change positions */
  53                 last += begx;
  54
  55                 if ((nscr->_minchng[j] == _NO_CHANGE) || (nscr->_minchng[j] > first))
  56                         nscr->_minchng[j] = first;
  57                 if (last > nscr->_maxchng[j]) nscr->_maxchng[j] = last;
  58
  59                 win->_minchng[i] = _NO_CHANGE;  /* updated now */
  60         }                       /* if */
  61         win->_maxchng[i] = _NO_CHANGE;  /* updated now */
  62   }                             /* for */
  63
  64   if (win->_clear) {
  65         win->_clear = FALSE;
  66         nscr->_clear = TRUE;
  67   }                             /* if */
  68   if (!win->_leave) {
  69         nscr->_cury = win->_cury + begy;
  70         nscr->_curx = win->_curx + begx;
  71   }                             /* if */
  72 }                               /* wnoutrefresh */