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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>overlay</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_009_710"> </a>NAME</h4><blockquote>overlay, overwrite - copy overlapped windows</blockquote><h4><a name = "tag_001_009_711"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="curses.h.html">curses.h</a>>int overlay(const WINDOW *<i>srcwin</i>, WINDOW *<i>dstwin</i>);int overwrite(const WINDOW *<i>srcwin</i>, WINDOW *<i>dstwin</i>);</code></pre></blockquote><h4><a name = "tag_001_009_712"> </a>DESCRIPTION</h4><blockquote>The<i>overlay()</i>and<i>overwrite()</i>functions overlay <i>srcwin</i> on top of <i>dstwin</i>. The <i>scrwin</i> and<i>dstwin</i> arguments need not be the same size; only text where the twowindows overlap is copied.<p>The<i>overwrite()</i>function copies characters as though a sequence of<i><a href="win_wch.html">win_wch()</a></i>and<i><a href="wadd_wch.html">wadd_wch()</a></i>were performed with the destination window's attributes and backgroundattributes cleared.<p>The<i>overlay()</i>function does the same thing, except that, whenever a character to be copiedis the background character of the source window,<i>overlay()</i>does not copy the character but merely moves the destination cursor the widthof the source background character.<p>If any portion of the overlaying window border is not the first column ofa multi-column character then all the column positions will be replaced withthe background character and rendition before the overlay is done. If thedefault background character is a multi-column character when this occurs,then these functions fail.</blockquote><h4><a name = "tag_001_009_713"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, these functions return OK. Otherwise, they returnERR.</blockquote><h4><a name = "tag_001_009_714"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_001_009_715"> </a>SEE ALSO</h4><blockquote><i><a href="copywin.html">copywin()</a></i>,<i><a href="curses.h.html"><curses.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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