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/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/*
* lib_pad.c
* newpad -- create a new pad
* pnoutrefresh -- refresh a pad, no update
* pechochar -- add a char to a pad and refresh
*/
#include "curses.priv.h"
#include <stdlib.h>
#include <errno.h>
#if !HAVE_EXTERN_ERRNO
extern int errno;
#endif
WINDOW *newpad(int l, int c)
{
WINDOW *win;
chtype *ptr;
int i, j;
T(("newpad(%d, %d) called", l, c));
if (l <= 0 || c <= 0)
return NULL;
if ((win = _nc_makenew(l,c,0,0)) == NULL)
return NULL;
win->_flags |= _ISPAD;
for (i = 0; i < l; i++) {
win->_line[i].oldindex = _NEWINDEX;
if ((win->_line[i].text = (chtype *) calloc((size_t)c, sizeof(chtype))) == NULL) {
for (j = 0; j < i; j++)
free(win->_line[j].text);
free(win->_line);
free(win);
errno = ENOMEM;
return NULL;
}
else
for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; )
*ptr++ = ' ';
}
T(("newpad: returned window is %p", win));
return(win);
}
WINDOW *subpad(WINDOW *orig, int l, int c, int begy, int begx)
{
WINDOW *win;
T(("subpad(%d, %d) called", l, c));
if ((win = derwin(orig, l, c, begy, begx)) == NULL)
return NULL;
win->_flags |= _ISPAD;
T(("subpad: returned window is %p", win));
return(win);
}
int prefresh(WINDOW *win, int pminrow, int pmincol,
int sminrow, int smincol, int smaxrow, int smaxcol)
{
T(("prefresh() called"));
if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol) != ERR
&& doupdate() != ERR) {
return OK;
}
return ERR;
}
int pnoutrefresh(WINDOW *win, int pminrow, int pmincol,
int sminrow, int smincol, int smaxrow, int smaxcol)
{
short i, j;
short m, n;
short pmaxrow;
short pmaxcol;
short displaced;
bool wide;
T(("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d) called",
win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));
if (win == 0)
return ERR;
if (!(win->_flags & _ISPAD))
return 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;
if (smaxrow > screen_lines
|| smaxcol > screen_columns
|| sminrow > smaxrow
|| smincol > smaxcol)
return ERR;
pmaxrow = pminrow + smaxrow - sminrow;
pmaxcol = pmincol + smaxcol - smincol;
T((" pminrow + smaxrow - sminrow %d, win->_maxy %d", pmaxrow, win->_maxy));
T((" pmincol + smaxcol - smincol %d, win->_maxx %d", pmaxcol, win->_maxx));
if ((pmaxrow > win->_maxy)
|| (pmaxcol > win->_maxx))
return ERR;
T(("pad being refreshed"));
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;
/*
* 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.
*/
wide = (sminrow <= 1 && win->_maxx >= (newscr->_maxx - 1));
for (i = pminrow, m = sminrow; i <= pmaxrow; 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++) {
if (oline->text[j] != nline->text[n]) {
nline->text[n] = oline->text[j];
if (nline->firstchar == _NOCHANGE)
nline->firstchar = nline->lastchar = n;
else if (n < nline->firstchar)
nline->firstchar = n;
else if (n > nline->lastchar)
nline->lastchar = n;
}
}
if (wide) {
int nind = m + displaced;
if (oline->oldindex < 0
|| nind < sminrow
|| nind > smaxrow)
nind = _NEWINDEX;
nline->oldindex = nind;
}
oline->firstchar = oline->lastchar = _NOCHANGE;
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.
*/
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;
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;
newscr->_curx = win->_curx - pmincol + win->_begx;
}
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;
return OK;
}
int pechochar(WINDOW *pad, chtype ch)
{
T(("echochar(%p, %lx)", pad, ch));
if (pad->_flags & _ISPAD)
return ERR;
waddch(curscr, ch);
doupdate();
return OK;
}
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