curs_overlay(3X)                                 curs_overlay(3X)



NAME
       overlay, overwrite, copywin - overlay and manipulate
       overlapped curses windows

SYNOPSIS
       #include 

       int overlay(const WINDOW *srcwin, WINDOW *dstwin);
       int overwrite(const WINDOW *srcwin, WINDOW *dstwin);
       int copywin(const  WINDOW  *srcwin,  WINDOW  *dstwin,  int
       sminrow,
             int smincol, int dminrow, int dmincol, int dmaxrow,
             int dmaxcol, int overlay);

DESCRIPTION
       The  overlay  and overwrite routines overlay srcwin on top
       of dstwin.  scrwin and dstwin are not required to  be  the
       same  size;  only  text  where  the two windows overlap is
       copied.  The difference is that overlay is non-destructive
       (blanks  are not copied) whereas overwrite is destructive.

       The copywin routine provides a finer granularity  of  con-
       trol over the overlay and overwrite routines.  Like in the
       prefresh routine, a rectangle is specified in the destina-
       tion  window,  (dminrow,  dmincol) and (dmaxrow, dmaxcol),
       and the upper-left-corner coordinates of the  source  win-
       dow, (sminrow, smincol).  If the argument overlay is true,
       then copying is non-destructive, as in overlay.

RETURN VALUE
       Routines that return an integer return ERR  upon  failure,
       and  OK  (SVr4 only specifies "an integer value other than
       ERR") upon successful completion.

       X/Open defines no error conditions.  In  this  implementa-
       tion,  copywin,  overlay  and overwrite return an error if
       either of the window pointers are null, or if some part of
       the window would be placed off-screen.

NOTES
       Note that overlay and overwrite may be macros.

PORTABILITY
       The XSI Curses standard, Issue 4 describes these functions
       (adding the const qualifiers).  It further specifies their
       behavior in the presence of characters with multibyte ren-
       ditions (not yet supported in this implementation).

SEE ALSO
       curses(3X), curs_pad(3X), curs_refresh(3X)



                                                 curs_overlay(3X)