getbkgd(3ncurses): - curses window background manipulation routines

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.

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