/* approximate update cost */
static int
update_cost(NCURSES_CH_T * from, NCURSES_CH_T * to)
{
int cost = 0;
int i;
for (i = TEXTWIDTH; i > 0; i--)
if (!(CharEq(*from++, *to++)))
cost++;
return cost;
}
static int
update_cost_from_blank(NCURSES_CH_T * to)
{
int cost = 0;
int i;
NCURSES_CH_T blank = blankchar;
if (back_color_erase)
SetPair(blank, GetPair(stdscr->_nc_bkgd));
for (i = TEXTWIDTH; i > 0; i--)
if (!(CharEq(blank, *to++)))
cost++;
return cost;
}
pnoutrefresh(WINDOW *win,
int pminrow,
int pmincol,
int sminrow,
int smincol,
int smaxrow,
int smaxcol)
{
NCURSES_SIZE_T i, j;
NCURSES_SIZE_T m, n;
NCURSES_SIZE_T pmaxrow;
NCURSES_SIZE_T pmaxcol;
SCREEN *sp;
#if USE_SCROLL_HINTS
const int my_len = 2; /* parameterize the threshold for hardscroll */
NCURSES_SIZE_T displaced;
bool wide;
#endif
T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"),
(void *) win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));
if (win == 0)
returnCode(ERR);
if (!(win->_flags & _ISPAD))
returnCode(ERR);
sp = _nc_screen_of(win);
/* negative values are interpreted as zero */
if (pminrow < 0)
pminrow = 0;
if (pmincol < 0)
pmincol = 0;
if (sminrow < 0)
sminrow = 0;
if (smincol < 0)
smincol = 0;
pmaxrow = pminrow + smaxrow - sminrow;
pmaxcol = pmincol + smaxcol - smincol;
T((" pminrow + smaxrow - sminrow %ld, win->_maxy %ld",
(long) pmaxrow, (long) win->_maxy));
T((" pmincol + smaxcol - smincol %ld, win->_maxx %ld",
(long) pmaxcol, (long) win->_maxx));
/*
* Trim the caller's screen size back to the actual limits.
*/
if (pmaxrow > win->_maxy) {
smaxrow -= (pmaxrow - win->_maxy);
pmaxrow = pminrow + smaxrow - sminrow;
}
if (pmaxcol > win->_maxx) {
smaxcol -= (pmaxcol - win->_maxx);
pmaxcol = pmincol + smaxcol - smincol;
}
if (smaxrow >= screen_lines(sp)
|| smaxcol >= screen_columns(sp)
|| sminrow > smaxrow
|| smincol > smaxcol)
returnCode(ERR);
T(("pad being refreshed"));
#if USE_SCROLL_HINTS
if (win->_pad._pad_y >= 0) {
displaced = pminrow - win->_pad._pad_y
- (sminrow - win->_pad._pad_top);
T(("pad being shifted by %d line(s)", displaced));
} else
displaced = 0;
#endif
/*
* For pure efficiency, we'd want to transfer scrolling information
* from the pad to newscr whenever the window is wide enough that
* its update will dominate the cost of the update for the horizontal
* band of newscr that it occupies. Unfortunately, this threshold
* tends to be complex to estimate, and in any case scrolling the
* whole band and rewriting the parts outside win's image would look
* really ugly. So. What we do is consider the pad "wide" if it
* either (a) occupies the whole width of newscr, or (b) occupies
* all but at most one column on either vertical edge of the screen
* (this caters to fussy people who put boxes around full-screen
* windows). Note that changing this formula will not break any code,
* merely change the costs of various update cases.
*/
#if USE_SCROLL_HINTS
wide = (smincol < my_len && smaxcol > (NewScreen(sp)->_maxx - my_len));
#endif
for (i = pminrow, m = sminrow + win->_yoffset;
i <= pmaxrow && m <= NewScreen(sp)->_maxy;
i++, m++) {
register struct ldat *nline = &NewScreen(sp)->_line[m];
register struct ldat *oline = &win->_line[i];
for (j = pmincol, n = smincol; j <= pmaxcol; j++, n++) {
NCURSES_CH_T ch = oline->text[j];
#if USE_WIDEC_SUPPORT
/*
* Special case for leftmost character of the displayed area.
* Only half of a double-width character may be visible.
*/
if (j == pmincol
&& j > 0
&& isWidecExt(ch)) {
SetChar(ch, L(' '), AttrOf(oline->text[j - 1]));
}
#endif
if (!CharEq(ch, nline->text[n])) {
nline->text[n] = ch;
CHANGED_CELL(nline, n);
}
}
#if USE_SCROLL_HINTS
if (wide) {
int nind = m + displaced;
if (oline->oldindex < 0
|| nind < sminrow
|| nind > smaxrow) {
nind = _NEWINDEX;
} else if (displaced) {
register struct ldat *pline = &CurScreen(sp)->_line[nind];
for (j = 0; j <= my_len; j++) {
int k = NewScreen(sp)->_maxx - j;
if (pline->text[j] != nline->text[j]
|| pline->text[k] != nline->text[k]) {
nind = _NEWINDEX;
break;
}
}
}
nline->oldindex = nind;
}
#endif /* USE_SCROLL_HINTS */
oline->firstchar = oline->lastchar = _NOCHANGE;
if_USE_SCROLL_HINTS(oline->oldindex = i);
}
/*
* Clean up debris from scrolling or resizing the pad, so we do not
* accidentally pick up the index value during the next call to this
* procedure. The only rows that should have an index value are those
* that are displayed during this cycle.
*/
#if USE_SCROLL_HINTS
for (i = pminrow - 1; (i >= 0) && (win->_line[i].oldindex >= 0); i--)
win->_line[i].oldindex = _NEWINDEX;
for (i = pmaxrow + 1; (i <= win->_maxy)
&& (win->_line[i].oldindex >= 0); i++)
win->_line[i].oldindex = _NEWINDEX;
#endif
win->_begx = smincol;
win->_begy = sminrow;
if (win->_clear) {
win->_clear = FALSE;
NewScreen(sp)->_clear = TRUE;
}
/*
* Use the pad's current position, if it will be visible.
* If not, don't do anything; it's not an error.
*/
if (win->_leaveok == FALSE
&& win->_cury >= pminrow
&& win->_curx >= pmincol
&& win->_cury <= pmaxrow
&& win->_curx <= pmaxcol) {
NewScreen(sp)->_cury = win->_cury - pminrow + win->_begy + win->_yoffset;
NewScreen(sp)->_curx = win->_curx - pmincol + win->_begx;
}
NewScreen(sp)->_leaveok = win->_leaveok;
win->_flags &= ~_HASMOVED;
/*
* Update our cache of the line-numbers that we displayed from the pad.
* We will use this on subsequent calls to this function to derive
* values to stuff into 'oldindex[]' -- for scrolling optimization.
*/
win->_pad._pad_y = pminrow;
win->_pad._pad_x = pmincol;
win->_pad._pad_top = sminrow;
win->_pad._pad_left = smincol;
win->_pad._pad_bottom = smaxrow;
win->_pad._pad_right = smaxcol;
returnCode(OK);
}
copywin(const WINDOW *src, WINDOW *dst,
int sminrow, int smincol,
int dminrow, int dmincol,
int dmaxrow, int dmaxcol,
int over)
{
int rc = ERR;
int sx, sy, dx, dy;
bool touched;
attr_t bk;
attr_t mask;
T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));
if (src && dst) {
_nc_lock_global(curses);
bk = AttrOf(dst->_nc_bkgd);
mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
/* make sure rectangle exists in source */
if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) &&
(smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) {
T(("rectangle exists in source"));
/* make sure rectangle fits in destination */
if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) {
T(("rectangle fits in destination"));
for (dy = dminrow, sy = sminrow;
dy <= dmaxrow;
sy++, dy++) {
touched = FALSE;
for (dx = dmincol, sx = smincol;
dx <= dmaxcol;
sx++, dx++) {
if (over) {
if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
(!CharEq(dst->_line[dy].text[dx],
src->_line[sy].text[sx]))) {
dst->_line[dy].text[dx] =
src->_line[sy].text[sx];
SetAttr(dst->_line[dy].text[dx],
((AttrOf(src->_line[sy].text[sx]) &
mask) | bk));
touched = TRUE;
}
} else {
if (!CharEq(dst->_line[dy].text[dx],
src->_line[sy].text[sx])) {
dst->_line[dy].text[dx] =
src->_line[sy].text[sx];
touched = TRUE;
}
}
}
if (touched) {
touchline(dst, dminrow, (dmaxrow - dminrow + 1));
}
}
T(("finished copywin"));
rc = OK;
}
}
_nc_unlock_global(curses);
}
returnCode(rc);
}
