wresize(WINDOW *win, int ToLines, int ToCols)
{
int col, row, size_x, size_y;
struct ldat *pline;
struct ldat *new_lines = 0;
#ifdef TRACE
T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
if (win) {
TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
(long) win->_begy, (long) win->_begx,
(long) win->_maxy, (long) win->_maxx,
(long) win->_regtop, (long) win->_regbottom));
if (_nc_tracing & TRACE_UPDATE)
_tracedump("...before", win);
}
#endif
if (!win || --ToLines < 0 || --ToCols < 0)
returnCode(ERR);
size_x = win->_maxx;
size_y = win->_maxy;
if (ToLines == size_y
&& ToCols == size_x)
returnCode(OK);
if ((win->_flags & _SUBWIN)) {
/*
* Check if the new limits will fit into the parent window's size. If
* not, do not resize. We could adjust the location of the subwindow,
* but the application may not like that.
*/
if (win->_pary + ToLines > win->_parent->_maxy
|| win->_parx + ToCols > win->_parent->_maxx) {
returnCode(ERR);
}
pline = win->_parent->_line;
} else {
pline = 0;
}
/*
* Allocate new memory as needed. Do the allocations without modifying
* the original window, in case an allocation fails. Always allocate
* (at least temporarily) the array pointing to the individual lines.
*/
new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1));
if (new_lines == 0)
returnCode(ERR);
/*
* For each line in the target, allocate or adjust pointers for the
* corresponding text, depending on whether this is a window or a
* subwindow.
*/
for (row = 0; row <= ToLines; ++row) {
int begin = (row > size_y) ? 0 : (size_x + 1);
int end = ToCols;
NCURSES_CH_T *s;
if (!(win->_flags & _SUBWIN)) {
if (row <= size_y) {
if (ToCols != size_x) {
if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
returnCode(cleanup_lines(new_lines, row));
for (col = 0; col <= ToCols; ++col) {
s[col] = (col <= size_x
? win->_line[row].text[col]
: win->_nc_bkgd);
}
} else {
s = win->_line[row].text;
}
} else {
if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
returnCode(cleanup_lines(new_lines, row));
for (col = 0; col <= ToCols; ++col)
s[col] = win->_nc_bkgd;
}
} else {
s = &pline[win->_pary + row].text[win->_parx];
}
if_USE_SCROLL_HINTS(new_lines[row].oldindex = row);
if (row <= size_y) {
new_lines[row].firstchar = win->_line[row].firstchar;
new_lines[row].lastchar = win->_line[row].lastchar;
}
if ((ToCols != size_x) || (row > size_y)) {
if (end >= begin) { /* growing */
if (new_lines[row].firstchar < begin)
new_lines[row].firstchar = begin;
} else { /* shrinking */
new_lines[row].firstchar = 0;
}
new_lines[row].lastchar = ToCols;
}
new_lines[row].text = s;
}
/*
* Dispose of unwanted memory.
*/
if (!(win->_flags & _SUBWIN)) {
if (ToCols == size_x) {
for (row = ToLines + 1; row <= size_y; row++) {
free(win->_line[row].text);
}
} else {
for (row = 0; row <= size_y; row++) {
free(win->_line[row].text);
}
}
}
free(win->_line);
win->_line = new_lines;
/*
* Finally, adjust the parameters showing screen size and cursor
* position:
*/
win->_maxx = ToCols;
win->_maxy = ToLines;
if (win->_regtop > win->_maxy)
win->_regtop = win->_maxy;
if (win->_regbottom > win->_maxy
|| win->_regbottom == size_y)
win->_regbottom = win->_maxy;
if (win->_curx > win->_maxx)
win->_curx = win->_maxx;
if (win->_cury > win->_maxy)
win->_cury = win->_maxy;
/*
* Check for subwindows of this one, and readjust pointers to our text,
* if needed.
*/
repair_subwindows(win);
#ifdef TRACE
TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
(long) win->_begy, (long) win->_begx,
(long) win->_maxy, (long) win->_maxx,
(long) win->_regtop, (long) win->_regbottom));
if (_nc_tracing & TRACE_UPDATE)
_tracedump("...after:", win);
#endif
returnCode(OK);
}
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;
#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)"),
win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));
if (win == 0)
returnCode(ERR);
if (!(win->_flags & _ISPAD))
returnCode(ERR);
/* 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
|| smaxcol >= screen_columns
|| 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 > (newscr->_maxx - my_len));
#endif
for (i = pminrow, m = sminrow + win->_yoffset;
i <= pmaxrow && m <= newscr->_maxy;
i++, m++) {
register struct ldat *nline = &newscr->_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 = &curscr->_line[nind];
for (j = 0; j <= my_len; j++) {
int k = newscr->_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;
newscr->_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) {
newscr->_cury = win->_cury - pminrow + win->_begy + win->_yoffset;
newscr->_curx = win->_curx - pmincol + win->_begx;
}
newscr->_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);
}
wnoutrefresh(WINDOW *win)
{
NCURSES_SIZE_T limit_x;
NCURSES_SIZE_T i, j;
NCURSES_SIZE_T begx;
NCURSES_SIZE_T begy;
NCURSES_SIZE_T m, n;
#if USE_SCROLL_HINTS
bool wide;
#endif
T((T_CALLED("wnoutrefresh(%p)"), win));
#ifdef TRACE
if (_nc_tracing & TRACE_UPDATE)
_tracedump("...win", win);
#endif /* TRACE */
/*
* This function will break badly if we try to refresh a pad.
*/
if ((win == 0)
|| (win->_flags & _ISPAD))
returnCode(ERR);
/* put them here so "win == 0" won't break our code */
begx = win->_begx;
begy = win->_begy;
newscr->_bkgd = win->_bkgd;
newscr->_attrs = win->_attrs;
/* merge in change information from all subwindows of this window */
wsyncdown(win);
#if USE_SCROLL_HINTS
/*
* For pure efficiency, we'd want to transfer scrolling information
* from the window 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 window "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.
*/
wide = (begx <= 1 && win->_maxx >= (newscr->_maxx - 1));
#endif
win->_flags &= ~_HASMOVED;
/*
* Microtweaking alert! This double loop is one of the genuine
* hot spots in the code. Even gcc doesn't seem to do enough
* common-subexpression chunking to make it really tense,
* so we'll force the issue.
*/
/* limit(n) */
limit_x = win->_maxx;
/* limit(j) */
if (limit_x > win->_maxx)
limit_x = win->_maxx;
for (i = 0, m = begy + win->_yoffset;
i <= win->_maxy && m <= newscr->_maxy;
i++, m++) {
register struct ldat *nline = &newscr->_line[m];
register struct ldat *oline = &win->_line[i];
if (oline->firstchar != _NOCHANGE) {
int last = oline->lastchar;
if (last > limit_x)
last = limit_x;
for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) {
if (oline->text[j] != nline->text[n]) {
nline->text[n] = oline->text[j];
CHANGED_CELL(nline, n);
}
}
}
#if USE_SCROLL_HINTS
if (wide) {
int oind = oline->oldindex;
nline->oldindex = (oind == _NEWINDEX) ? _NEWINDEX : begy + oind
+ win->_yoffset;
}
#endif /* USE_SCROLL_HINTS */
oline->firstchar = oline->lastchar = _NOCHANGE;
if_USE_SCROLL_HINTS(oline->oldindex = i);
}
if (win->_clear) {
win->_clear = FALSE;
newscr->_clear = TRUE;
}
if (!win->_leaveok) {
newscr->_cury = win->_cury + win->_begy + win->_yoffset;
newscr->_curx = win->_curx + win->_begx;
}
newscr->_leaveok = win->_leaveok;
#ifdef TRACE
if (_nc_tracing & TRACE_UPDATE)
_tracedump("newscr", newscr);
#endif /* TRACE */
returnCode(OK);
}
