NAME

       bkgrnd,  wbkgrnd,  bkgrndset,  wbkgrndset,  getbkgrnd,  wgetbkgrnd - curses window complex
       background manipulation routines

SYNOPSIS

       #include <curses.h>

       int bkgrnd( const cchar_t *wch);
       int wbkgrnd( WINDOW *win, const cchar_t *wch);

       void bkgrndset(const cchar_t *wch );
       void wbkgrndset(WINDOW *win, const cchar_t *wch);

       int getbkgrnd(cchar_t *wch);
       int wgetbkgrnd(WINDOW *win, cchar_t *wch);

DESCRIPTION

   bkgrndset
       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.

   bkgrnd
       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.

   getbkgrnd
       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 returned).

NOTES

       Note that bkgrnd, bkgrndset, and getbkgrnd may be macros.

       X/Open   Curses  does  not  provide  details  on  how  the  rendition  is  changed.   This
       implementation follows the approach used in SVr4 curses, which is explained in the  manual
       page for wbkgd.

RETURN VALUE

       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.

PORTABILITY

       These functions are described in the XSI Curses standard, Issue 4 (X/Open Curses).

SEE ALSO

       ncurses(3NCURSES), bkgd(3NCURSES)