curs_overlay(3x) Library calls curs_overlay(3x)
overlay, overwrite, copywin - overlay curses windows and manipulate
them
#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);
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 overlay.
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.
Note that overlay and overwrite may be macros.
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).
curses(3x), curs_pad(3x), curs_refresh(3x)
ncurses 6.4 2023-12-16 curs_overlay(3x)