--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/pdcurses/refresh.c Sat Jan 09 17:41:21 2016 +0200
@@ -0,0 +1,276 @@
+/* Public Domain Curses */
+
+#include <curspriv.h>
+
+RCSID("$Id: refresh.c,v 1.56 2008/07/13 16:08:18 wmcbrine Exp $")
+
+/*man-start**************************************************************
+
+ Name: refresh
+
+ Synopsis:
+ int refresh(void);
+ int wrefresh(WINDOW *win);
+ int wnoutrefresh(WINDOW *win);
+ int doupdate(void);
+ int redrawwin(WINDOW *win);
+ int wredrawln(WINDOW *win, int beg_line, int num_lines);
+
+ Description:
+ wrefresh() copies the named window to the physical terminal
+ screen, taking into account what is already there in order to
+ optimize cursor movement. refresh() does the same, using stdscr.
+ These routines must be called to get any output on the terminal,
+ as other routines only manipulate data structures. Unless
+ leaveok() has been enabled, the physical cursor of the terminal
+ is left at the location of the window's cursor.
+
+ wnoutrefresh() and doupdate() allow multiple updates with more
+ efficiency than wrefresh() alone. wrefresh() works by first
+ calling wnoutrefresh(), which copies the named window to the
+ virtual screen. It then calls doupdate(), which compares the
+ virtual screen to the physical screen and does the actual
+ update. A series of calls to wrefresh() will result in
+ alternating calls to wnoutrefresh() and doupdate(), causing
+ several bursts of output to the screen. By first calling
+ wnoutrefresh() for each window, it is then possible to call
+ doupdate() only once.
+
+ In PDCurses, redrawwin() is equivalent to touchwin(), and
+ wredrawln() is the same as touchline(). In some other curses
+ implementations, there's a subtle distinction, but it has no
+ meaning in PDCurses.
+
+ Return Value:
+ All functions return OK on success and ERR on error.
+
+ Portability X/Open BSD SYS V
+ refresh Y Y Y
+ wrefresh Y Y Y
+ wnoutrefresh Y Y Y
+ doupdate Y Y Y
+ redrawwin Y - 4.0
+ wredrawln Y - 4.0
+
+**man-end****************************************************************/
+
+#include <string.h>
+
+int wnoutrefresh(WINDOW *win)
+{
+ int begy, begx; /* window's place on screen */
+ int i, j;
+
+ PDC_LOG(("wnoutrefresh() - called: win=%p\n", win));
+
+ if ( !win || (win->_flags & (_PAD|_SUBPAD)) )
+ return ERR;
+
+ begy = win->_begy;
+ begx = win->_begx;
+
+ for (i = 0, j = begy; i < win->_maxy; i++, j++)
+ {
+ if (win->_firstch[i] != _NO_CHANGE)
+ {
+ chtype *src = win->_y[i];
+ chtype *dest = curscr->_y[j] + begx;
+
+ int first = win->_firstch[i]; /* first changed */
+ int last = win->_lastch[i]; /* last changed */
+
+ /* ignore areas on the outside that are marked as changed,
+ but really aren't */
+
+ while (first <= last && src[first] == dest[first])
+ first++;
+
+ while (last >= first && src[last] == dest[last])
+ last--;
+
+ /* if any have really changed... */
+
+ if (first <= last)
+ {
+ memcpy(dest + first, src + first,
+ (last - first + 1) * sizeof(chtype));
+
+ first += begx;
+ last += begx;
+
+ if (first < curscr->_firstch[j] ||
+ curscr->_firstch[j] == _NO_CHANGE)
+ curscr->_firstch[j] = first;
+
+ if (last > curscr->_lastch[j])
+ curscr->_lastch[j] = last;
+ }
+
+ win->_firstch[i] = _NO_CHANGE; /* updated now */
+ }
+
+ win->_lastch[i] = _NO_CHANGE; /* updated now */
+ }
+
+ if (win->_clear)
+ win->_clear = FALSE;
+
+ if (!win->_leaveit)
+ {
+ curscr->_cury = win->_cury + begy;
+ curscr->_curx = win->_curx + begx;
+ }
+
+ return OK;
+}
+
+int doupdate(void)
+{
+ int y;
+ bool clearall;
+
+ PDC_LOG(("doupdate() - called\n"));
+
+ if (!curscr)
+ return ERR;
+
+ if (isendwin()) /* coming back after endwin() called */
+ {
+ reset_prog_mode();
+ clearall = TRUE;
+ SP->alive = TRUE; /* so isendwin() result is correct */
+ }
+ else
+ clearall = curscr->_clear;
+
+ for (y = 0; y < SP->lines; y++)
+ {
+ PDC_LOG(("doupdate() - Transforming line %d of %d: %s\n",
+ y, SP->lines, (curscr->_firstch[y] != _NO_CHANGE) ?
+ "Yes" : "No"));
+
+ if (clearall || curscr->_firstch[y] != _NO_CHANGE)
+ {
+ int first, last;
+
+ chtype *src = curscr->_y[y];
+ chtype *dest = pdc_lastscr->_y[y];
+
+ if (clearall)
+ {
+ first = 0;
+ last = COLS - 1;
+ }
+ else
+ {
+ first = curscr->_firstch[y];
+ last = curscr->_lastch[y];
+ }
+
+ while (first <= last)
+ {
+ int len = 0;
+
+ /* build up a run of changed cells; if two runs are
+ separated by a single unchanged cell, ignore the
+ break */
+
+ if (clearall)
+ len = last - first + 1;
+ else
+ while (first + len <= last &&
+ (src[first + len] != dest[first + len] ||
+ (len && first + len < last &&
+ src[first + len + 1] != dest[first + len + 1])
+ )
+ )
+ len++;
+
+ /* update the screen, and pdc_lastscr */
+
+ if (len)
+ {
+ PDC_transform_line(y, first, len, src + first);
+ memcpy(dest + first, src + first, len * sizeof(chtype));
+ first += len;
+ }
+
+ /* skip over runs of unchanged cells */
+
+ while (first <= last && src[first] == dest[first])
+ first++;
+ }
+
+ curscr->_firstch[y] = _NO_CHANGE;
+ curscr->_lastch[y] = _NO_CHANGE;
+ }
+ }
+
+ curscr->_clear = FALSE;
+
+ if (SP->visibility)
+ PDC_gotoyx(curscr->_cury, curscr->_curx);
+
+ SP->cursrow = curscr->_cury;
+ SP->curscol = curscr->_curx;
+
+ return OK;
+}
+
+int wrefresh(WINDOW *win)
+{
+ bool save_clear;
+
+ PDC_LOG(("wrefresh() - called\n"));
+
+ if ( !win || (win->_flags & (_PAD|_SUBPAD)) )
+ return ERR;
+
+ save_clear = win->_clear;
+
+ if (win == curscr)
+ curscr->_clear = TRUE;
+ else
+ wnoutrefresh(win);
+
+ if (save_clear && win->_maxy == SP->lines && win->_maxx == SP->cols)
+ curscr->_clear = TRUE;
+
+ return doupdate();
+}
+
+int refresh(void)
+{
+ PDC_LOG(("refresh() - called\n"));
+
+ return wrefresh(stdscr);
+}
+
+int wredrawln(WINDOW *win, int start, int num)
+{
+ int i;
+
+ PDC_LOG(("wredrawln() - called: win=%p start=%d num=%d\n",
+ win, start, num));
+
+ if (!win || start > win->_maxy || start + num > win->_maxy)
+ return ERR;
+
+ for (i = start; i < start + num; i++)
+ {
+ win->_firstch[i] = 0;
+ win->_lastch[i] = win->_maxx - 1;
+ }
+
+ return OK;
+}
+
+int redrawwin(WINDOW *win)
+{
+ PDC_LOG(("redrawwin() - called: win=%p\n", win));
+
+ if (!win)
+ return ERR;
+
+ return wredrawln(win, 0, win->_maxy);
+}