.\"	$NetBSD: curses_background.3,v 1.2 2002/10/21 14:17:54 wiz Exp $
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Julian Coleman.
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.Dd October 13, 2002
.Dt CURSES_BACKGROUND 3
.Os
.Sh NAME
.Nm curses_background ,
.Nm bkgd ,
.Nm bkgdset ,
.Nm getbkgd ,
.Nm wbkgd ,
.Nm wbkgdset
.Nd curses attribute manipulation routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.Fd #include \*[Lt]curses.h\*[Gt]
.Ft int
.Fn bkgd chtype
.Ft int
.Fn bkgdset chtype
.Ft chtype
.Fn getbkgd "WINDOW *"
.Ft int
.Fn wbkgd chtype
.Ft int
.Fn wbkgdset chtype
.Sh DESCRIPTION
These functions manipulate the background attributes on
.Dv stdscr
or on the specified window.
.Pp
The function
.Fn wbkgdset win ch
sets the background attributes of the specified window
.Fa win
to
.Fa ch .
.Pp
The function
.Fn wbkgd win ch
sets the background attributes of the specified window
.Fa win
to
.Fa ch
and also sets the background attribute of every character position on that
window.
.Pp
The functions
.Fn bkgdset ch
and
.Fn bkgd ch
are equivalent to
.Fn wbkgdset stdscr ch
and
.Fn wbkgd stdscr ch ,
respectively.
.Pp
When the background attributes are set on a window, characters are rendered
with the logical
.Em OR
of the background attributes and the character's attributes.
If both the background attribute and the character attribute contain color,
the color of the character attribute is displayed.
If the background attribute contains a non-space character, then this
character is rendered where the foreground character is a space character.
.Pp
The function
.Fn getbkgd win
returns the background attributes for the window
.Fa win .
.Sh RETURN VALUES
The functions
.Fn wbkgdset
and
.Fn wbkgd
return OK on success and ERR on failure.
.Sh SEE ALSO
.Xr curses_attributes 3 ,
.Xr curses_color 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of the
Single Unix Specification.
.Sh HISTORY
These functions first appeared in
.Nx 1.6 .