void bkgdset(chtype ch);
void wbkgdset(WINDOW *win, chtype ch);
int bkgd(chtype ch);
int wbkgd(WINDOW *win, chtype ch);
chtype getbkgd(WINDOW *win);
The bkgdset and wbkgdset routines manipulate the
background of the named window.
The window background is a chtype consisting of
any combination of attributes (i.e., rendition) and a 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 bkgd and wbkgd functions
set the background property of the current or specified window
and then apply this setting to every character position in that window:
Wherever the former background character
appears, it is changed to the new background character.