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/* Public Domain Curses */

#include <curspriv.h>

RCSID("$Id: refresh.c,v 1.1 2009/05/10 08:29:53 jld 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);

}