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curs_overlay(3X)                                                                            curs_overlay(3X)



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

SYNOPSIS
       #include <curses.h>

       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 re-quired required
       quired 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 control over the overlay and overwrite routines.
       Like in the prefresh routine, a rectangle is specified in the destination window, (dminrow,  dmincol)
       and  (dmaxrow,  dmaxcol), and the upper-left-corner coordinates of the source window, (sminrow, smin-col). smincol).
       col).  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 val-ue value
       ue other than ERR") upon successful completion.

       X/Open defines no error conditions.  In this implementation, 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. offscreen.
       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 renditions (not  yet  supported
       in this implementation).

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



                                                                                            curs_overlay(3X)