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., 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 line/character operations.
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:
.IP • 4 The rendition of every character on the screen is changed to the new background rendition.
.IP • 4 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. If the given window pointer is null, the character is not updated (but no error returned).
The bkgrndset and wbkgrndset routines do not return a value.