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:
· 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 getbkgd function returns the given window's current background
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