NAME

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

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

   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.

   copywin
       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 overlay.

RETURN VALUE

       These routines return the integer ERR upon failure and an  OK  (SVr4  specifies  only  “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

       Note that overlay and overwrite may be macros.

PORTABILITY

       These  functions  are  described  in  the  XSI  Curses standard, Issue 4, which adds const
       qualifiers to the arguments.  It further specifies  their  behavior  in  the  presence  of
       characters with multibyte renditions (not yet supported in this implementation).

SEE ALSO

       ncurses(3NCURSES), pad(3NCURSES), refresh(3NCURSES)