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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>Types</title><meta name="generator" content="DocBook XSL Stylesheets V1.68.1"><link rel="start" href="index.html" title="Cairo: A Vector Graphics Library"><link rel="up" href="Support.html" title="Utilities"><link rel="prev" href="cairo-Version-Information.html" title="Version Information"><link rel="next" href="ix01.html" title="Index"><meta name="generator" content="GTK-Doc V1.6 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="part" href="pt01.html" title="Part I. Tutorial"><link rel="part" href="pt02.html" title="Part II. Reference"><link rel="chapter" href="Drawing.html" title="Drawing"><link rel="chapter" href="Fonts.html" title="Fonts"><link rel="chapter" href="Surfaces.html" title="Surfaces"><link rel="chapter" href="Support.html" title="Utilities"><link rel="index" href="ix01.html" title="Index"><link rel="appendix" href="language-bindings.html" title="Appendix A. Creating a language binding for cairo"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="cairo-Version-Information.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="Support.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">Cairo: A Vector Graphics Library</th><td><a accesskey="n" href="ix01.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#top_of_page" class="shortcut">Top</a>  |  <a href="#desc" class="shortcut">Description</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="cairo-Types"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><span class="refentrytitle"><a name="top_of_page"></a>Types</span></h2><p>Types — Generic data types used in the cairo API</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><a name="synopsis"></a><h2>Synopsis</h2><pre class="synopsis">typedef <a href="cairo-Types.html#cairo-bool-t">cairo_bool_t</a>; <a href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a>;void (<a href="cairo-Types.html#cairo-destroy-func-t">*cairo_destroy_func_t</a>) (void *data);</pre></div><div class="refsect1" lang="en"><a name="desc"></a><h2>Description</h2><p></p></div><div class="refsect1" lang="en"><a name="details"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id2562768"></a><h3><a name="cairo-bool-t"></a>cairo_bool_t</h3><a class="indexterm" name="id2565811"></a><pre class="programlisting">typedef int cairo_bool_t;</pre><p><a href="cairo-Types.html#cairo-bool-t"><span class="type">cairo_bool_t</span></a> is used for boolean values. Returns of type<a href="cairo-Types.html#cairo-bool-t"><span class="type">cairo_bool_t</span></a> will always be either 0 or 1, but testing againstthese values explicitly is not encouraged; just use thevalue as a boolean condition.</p><p></p><div class="informalexample"><pre class="programlisting"> if (cairo_in_stroke (cr, x, y)) { /* do something */ }</pre></div><p></p></div><hr><div class="refsect2" lang="en"><a name="id2589661"></a><h3><a name="cairo-user-data-key-t"></a>cairo_user_data_key_t</h3><a class="indexterm" name="id2589672"></a><pre class="programlisting">typedef struct { int unused;} cairo_user_data_key_t;</pre><p><a href="cairo-Types.html#cairo-user-data-key-t"><span class="type">cairo_user_data_key_t</span></a> is used for attaching user data to cairodata structures. The actual contents of the struct is never used,and there is no need to initialize the object; only the uniqueaddress of a <span class="type">cairo_data_key_t</span> object is used. Typically, youwould just use the address of a static <span class="type">cairo_data_key_t</span> object.</p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term">int <em class="structfield"><code>unused</code></em>;</span></td><td> not used; ignore.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2587392"></a><h3><a name="cairo-destroy-func-t"></a>cairo_destroy_func_t ()</h3><a class="indexterm" name="id2587403"></a><pre class="programlisting">void (*cairo_destroy_func_t) (void *data);</pre><p><a href="cairo-Types.html#cairo-destroy-func-t"><span class="type">cairo_destroy_func_t</span></a> the type of function which is called when adata element is destroyed. It is passed the pointer to the dataelement and should free any memory and resources allocated for it.</p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>data</code></em> :</span></td><td> The data element being destroyed.</td></tr></tbody></table></div></div></div></div></body></html>⌨️ 快捷键说明
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