bkgrnd, wbkgrnd, bkgrndset, wbkgrndset, getbkgrnd, wgetbkgrnd - curses window complex
background manipulation routines
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 background of the named window. The
window background is a cchar_t consisting of any combination of attributes (i.e., rendi-
tion) 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 line/character operations.
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 property 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
Wherever the former background character appears, it is changed to the new back-
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 value.
Upon successful completion, the other functions return OK. Otherwise, they return ERR. A
null window pointer is treated as an error.