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.
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 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. If the given window
pointer is null, the character is not updated (but no error
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.
· A null character pointer is treated as an error.
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