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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | PORTABILITY | SEE ALSO | COLOPHON |
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curs_overlay(3X) curs_overlay(3X)
overlay, overwrite, copywin - overlay and manipulate overlapped
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 sminrow,
int smincol, int dminrow, int dmincol, int dmaxrow,
int dmaxcol, int overlay);
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; 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.
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, dmin‐
col) 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 suc‐
cessful completion.
X/Open defines no error conditions. In this implementation, copy‐
win, 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.
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 renditions (not yet support‐
ed in this implementation).
curses(3X), curs_pad(3X), curs_refresh(3X)
This page is part of the ncurses (new curses) project. Informa‐
tion about the project can be found at
⟨https://www.gnu.org/software/ncurses/ncurses.html⟩. If you have a
bug report for this manual page, send it to
bug-ncurses-request@gnu.org. This page was obtained from the
project's upstream Git mirror of the CVS repository
⟨https://github.com/mirror/ncurses.git⟩ on 2025-02-02. (At that
time, the date of the most recent commit that was found in the
repository was 2023-03-12.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
curs_overlay(3X)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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