overlay, overwrite, copywin - overlay and manipulate overlapped
int overlay(const WINDOW *srcwin, WINDOW *dstwin);
int overwrite(const WINDOW *srcwin, WINDOW *dstwin);
int copywin(WINDOW *srcwin, WINDOW *dstwin, int sminrow,
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 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, 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 multi-byte
renditions (not yet supported in this implementation).
curses(3), curs_pad(3), curs_refresh(3)
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