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