curs_overlay(3x) — Linux manual page


curs_overlay(3X)                                        curs_overlay(3X)

NAME         top

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

SYNOPSIS         top

       #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         top

   overlay, overwrite
       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 control over
       the overlay and overwrite routines.  As 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, smincol).  If the
       argument overlay is true, then copying is non-destructive, as in

RETURN VALUE         top

       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 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.

NOTES         top

       Note that overlay and overwrite may be macros.

PORTABILITY         top

       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         top

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

COLOPHON         top

       This page is part of the ncurses (new curses) project.
       Information about the project can be found at 
       ⟨⟩.  If you have
       a bug report for this manual page, send it to  This page was obtained from the
       project's upstream Git mirror of the CVS repository
       ⟨⟩ on 2023-06-23.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-03-12.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to