NAME
bkgdset, wbkgdset, bkgd, wbkgd, getbkgd - curses window background manipulation routines
SYNOPSIS
#include <curses.h> void bkgdset(chtype ch); void wbkgdset(WINDOW *win, chtype ch); int bkgd(chtype ch); int wbkgd(WINDOW *win, chtype ch); chtype getbkgd(WINDOW *win);
DESCRIPTION
bkgdset
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.
bkgd
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.
getbkgd
The getbkgd function returns the given window's current background
character/attribute pair.
RETURN VALUE
The routines bkgd and wbkgd return the integer OK. The SVr4.0 manual says "or a non-negative integer if immedok is set", but this appears to be an error.
NOTES
Note that bkgdset and bkgd may be macros.
PORTABILITY
These functions are described in the XSI Curses standard, Issue 4. It specifies that bkgd and wbkgd return ERR on failure, but gives no failure conditions.
SEE ALSO
ncurses(3NCURSES), addch(3NCURSES), attr(3NCURSES), outopts(3NCURSES) bkgd(3NCURSES)
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