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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>Graphics Contexts</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GTK+ Reference Manual"><link rel="up" href="gtkbase.html" title="Part II. GTK+ Core Reference"><link rel="prev" href="gtk-Standard-Enumerations.html" title="Standard Enumerations"><link rel="next" href="GtkStyle.html" title="Styles"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="part" href="gtk.html" title="Part I. GTK+ Overview"><link rel="part" href="gtkbase.html" title="Part II. GTK+ Core Reference"><link rel="part" href="gtkobjects.html" title="Part III. GTK+ Widgets and Objects"><link rel="chapter" href="ch01.html" title="Object Hierarchy"><link rel="chapter" href="ch02.html" title="Widget Gallery"><link rel="chapter" 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href="glossary.html" title="Glossary"><link rel="index" href="ix01.html" title="Index"><link rel="index" href="ix02.html" title="Index of deprecated symbols"><link rel="index" href="ix03.html" title="Index of new symbols in 2.2"><link rel="index" href="ix04.html" title="Index of new symbols in 2.4"><link rel="index" href="ix05.html" title="Index of new symbols in 2.6"><link rel="index" href="ix06.html" title="Index of new symbols in 2.8"><link rel="index" href="ix07.html" title="Index of new symbols in 2.10"><link rel="index" href="ix08.html" title="Index of new symbols in 2.12"></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="gtk-Standard-Enumerations.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="gtkbase.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">GTK+ Reference Manual</th><td><a accesskey="n" href="GtkStyle.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="#id3273766" class="shortcut">Top</a>  |  <a href="#id3273851" class="shortcut">Description</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="gtk-Graphics-Contexts"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id3273766"></a><span class="refentrytitle">Graphics Contexts</span></h2><p>Graphics Contexts — A shared pool of GdkGC objects</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <gtk/gtk.h><ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC">GdkGC</a>* <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-get">gtk_gc_get</a> (<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> depth, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColormap">GdkColormap</a> *colormap, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValues">GdkGCValues</a> *values, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValuesMask">GdkGCValuesMask</a> values_mask);void <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-release">gtk_gc_release</a> (<ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC">GdkGC</a> *gc);</pre></div><div class="refsect1" lang="en"><a name="id3273851"></a><h2>Description</h2><p>These functions provide access to a shared pool of <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> objects.When a new <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> is needed, <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-get"><code class="function">gtk_gc_get()</code></a> is called with the required depth,colormap and <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValues"><span class="type">GdkGCValues</span></a>. If a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> with the required properties alreadyexists then that is returned. If not, a new <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> is created.When the <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> is no longer needed, <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-release"><code class="function">gtk_gc_release()</code></a> should be called.</p></div><div class="refsect1" lang="en"><a name="id3273939"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3273949"></a><h3><a name="gtk-gc-get"></a>gtk_gc_get ()</h3><a class="indexterm" name="id3273962"></a><pre class="programlisting"><ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC">GdkGC</a>* gtk_gc_get (<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> depth, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColormap">GdkColormap</a> *colormap, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValues">GdkGCValues</a> *values, <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValuesMask">GdkGCValuesMask</a> values_mask);</pre><p>Gets a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> with the given depth, colormap and <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValues"><span class="type">GdkGCValues</span></a>.If a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> with the given properties already exists then it is returned,otherwise a new <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> is created.The returned <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> should be released with <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-release"><code class="function">gtk_gc_release()</code></a> when it is nolonger needed.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>depth</code></em> :</span></p></td><td>the depth of the <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> to create.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>colormap</code></em> :</span></p></td><td>the <ahref="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColormap"><span class="type">GdkColormap</span></a> (FIXME: I don't know why this is needed).</td></tr><tr><td><p><span class="term"><em class="parameter"><code>values</code></em> :</span></p></td><td>a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGCValues"><span class="type">GdkGCValues</span></a> struct containing settings for the <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a>.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>values_mask</code></em> :</span></p></td><td>a set of flags indicating which of the fields in <em class="parameter"><code>values</code></em> hasbeen set.</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3274185"></a><h3><a name="gtk-gc-release"></a>gtk_gc_release ()</h3><a class="indexterm" name="id3274198"></a><pre class="programlisting">void gtk_gc_release (<ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC">GdkGC</a> *gc);</pre><p>Releases a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> allocated using <a class="link" href="gtk-Graphics-Contexts.html#gtk-gc-get"><code class="function">gtk_gc_get()</code></a>.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>gc</code></em> :</span></p></td><td>a <ahref="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a>.</td></tr></tbody></table></div></div></div><div class="refsect1" lang="en"><a name="id3274271"></a><div class="refsect2" lang="en"><a name="id3274272"></a></div><hr><div class="refsect2" lang="en"><a name="id3274274"></a></div></div></div></body></html>?? 快捷鍵說明
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