curs_overlay(3x) — Linux manual page
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
overlay, overwrite
The overlay and overwrite routines overlay srcwin on top of dst‐
win. scrwin and dstwin are not required to be the same size; on‐
ly text where the two windows overlap is copied. The difference
is that overlay is non-destructive (blanks are not copied) where‐
as 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 coor‐
dinates of the source window, (sminrow, smincol). If the argu‐
ment 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 suc‐
cessful 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
The XSI Curses standard, Issue 4 describes these functions
(adding the const qualifiers). It further specifies their behav‐
ior in the presence of characters with multibyte renditions (not
yet supported in this implementation).
SEE ALSO
curses(3X), curs_pad(3X), curs_refresh(3X)
COLOPHON
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