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<H1 class="no-header">curs_overlay 3x 2025-01-18 ncurses 6.6 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>overlay</STRONG>, <STRONG>overwrite</STRONG>, <STRONG>copywin</STRONG> - overlay <EM>curses</EM> windows and manipulate
them
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>overlay(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>overwrite(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>copywin(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>sminrow</EM><STRONG>,</STRONG>
<STRONG>int</STRONG> <EM>smincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dmincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dmaxrow</EM><STRONG>,</STRONG>
<STRONG>int</STRONG> <EM>dmaxcol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>overlay</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
</PRE><H3><a name="h3-overlay_overwrite">overlay, overwrite</a></H3><PRE>
The <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> routines overlay <EM>srcwin</EM> on top of <EM>dstwin</EM>.
<EM>scrwin</EM> and <EM>dstwin</EM> are not required to be the same size; only text where
the two windows overlap is copied. The difference is that <STRONG>overlay</STRONG> is
non-destructive (blanks are not copied) whereas <STRONG>overwrite</STRONG> is
destructive.
</PRE><H3><a name="h3-copywin">copywin</a></H3><PRE>
The <STRONG>copywin</STRONG> routine provides a finer granularity of control over the
<STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> routines. As in the <STRONG>prefresh</STRONG> routine, a
rectangle is specified in the destination window, (<EM>dminrow</EM>, <EM>dmincol</EM>)
and (<EM>dmaxrow</EM>, <EM>dmaxcol</EM>), and the upper-left-corner coordinates of the
source window, (<EM>sminrow</EM>, <EM>smincol</EM>). If the argument <EM>overlay</EM> is <STRONG>true</STRONG>,
then copying is non-destructive, as in <STRONG>overlay</STRONG>.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
These functions return <STRONG>OK</STRONG> on success and <STRONG>ERR</STRONG> on failure.
In <EM>ncurses</EM>, they return <STRONG>ERR</STRONG> if
<STRONG>o</STRONG> either of the window pointers are null, or
<STRONG>o</STRONG> any part of the window would be placed off-screen.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
<STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> may be implemented as macros.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
X/Open Curses Issue 4 describes these functions. It specifies no error
conditions for them. It adds <EM>const</EM> qualifiers to the arguments. It
further specifies their behavior in the presence of characters with
multibyte renditions (not yet supported in this implementation).
SVr4 describes a successful return value only as "an integer value
other than <EM>ERR</EM>".
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
ncurses 6.6 2025-01-18 <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#h3-overlay_overwrite">overlay, overwrite</a></li>
<li><a href="#h3-copywin">copywin</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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