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curs_overlay 3x



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 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.  As  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.

       X/Open  defines  no error conditions.  In this implementa-
       tion, 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

       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).


SEE ALSO

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



                                                       curs_overlay(3x)

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