curs_overlay 3x


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


       #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
             int smincol, int dminrow, int dmincol, int dmaxrow,
             int dmaxcol, int overlay);


       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.


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


       Note that overlay and overwrite may be macros.


       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).


       curses(3x), curs_pad(3x), curs_refresh(3x)

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