curs_bkgrnd(3x) — Linux manual page


curs_bkgrnd(3X)                                          curs_bkgrnd(3X)

NAME         top

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

SYNOPSIS         top

       #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         top

       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 returned).

NOTES         top

       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         top

       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         top

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

SEE ALSO         top

       curses(3X), curs_bkgd(3X)

COLOPHON         top

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