bkgrnd, wbkgrnd, bkgrndset, wbkgrndset, getbkgrnd, wget-
bkgrnd - curses window complex background manipulation
int bkgrnd( const cchar_t *wch);
int wbkgrnd( WINDOW *win, const cchar_t *wch);
void bkgrndset(const cchar_t *wch );
void wbkgrndset(WINDOW *win, const cchar_t *wch);
int getbkgrnd(cchar_t *wch);
int wgetbkgrnd(WINDOW *win, cchar_t *wch);
The bkgrndset and wbkgrndset routines manipulate the back-
ground of the named window. The window background is a
cchar_t consisting of any combination of attributes (i.e.,
rendition) and a complex character. The attribute part of
the background is combined (OR'ed) with all non-blank
characters that are written into the window with waddch.
Both the character and attribute parts of the background
are combined with the blank characters. The background
becomes a property of the character and moves with the
character through any scrolling and insert/delete
To the extent possible on a particular terminal, the
attribute part of the background is displayed as the
graphic rendition of the character put on the screen.
The bkgrnd and wbkgrnd functions set the background prop-
erty of the current or specified window and then apply
this setting to every character position in that window:
The rendition of every character on the screen is
changed to the new background rendition.
Wherever the former background character appears,
it is changed to the new background character.
The getbkgrnd function returns the given window's current
background character/attribute pair via the wch pointer.
Note that bkgrnd, bkgrndset, and getbkgrnd may be macros.
The bkgrndset and wbkgrndset routines do not return a
Upon successful completion, the other functions return OK.
Otherwise, they return ERR. A null window pointer is
treated as an error.