curs_overlay(3)                                   curs_overlay(3)


NAME
       overlay, overwrite, copywin - overlay and manipulate over-
       lapped curses windows



SYNOPSIS
       #include <curses.h>

       int overlay(const WINDOW *srcwin, WINDOW *dstwin);
       int overwrite(const WINDOW *srcwin, WINDOW *dstwin);
       int copywin(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.

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 multi-byte
       renditions (not yet supported in this implementation).

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













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