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<HTML><HEAD><TITLE>Graphics Contexts</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.61"><LINKREL="HOME"TITLE="GTK+ Reference Manual"HREF="index.html"><LINKREL="UP"TITLE="GTK+ "HREF="gtk.html"><LINKREL="PREVIOUS"TITLE="Version Information"HREF="gtk-feature-test-macros.html"><LINKREL="NEXT"TITLE="Styles"HREF="gtk-styles.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"BGCOLOR="#000000"CELLPADDING="1"CELLSPACING="0"><TR><THCOLSPAN="4"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="5">GTK+ Reference Manual</FONT></TH></TR><TR><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="left"><AHREF="gtk-feature-test-macros.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B><<< Previous Page</B></FONT></A></TD><TDWIDTH="25%"BGCOLOR="#0000C0"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="index.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Home</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#00C000"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="gtk.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Up</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="right"><AHREF="gtk-styles.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Next Page >>></B></FONT></A></TD></TR></TABLE></DIV><H1><ANAME="GTK-GRAPHICS-CONTEXTS">Graphics Contexts</A></H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN1177"></A><H2>Name</H2>Graphics Contexts -- provides access to a shared pool of <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> objects.</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN1181"></A><H2>Synopsis</H2><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="SYNOPSIS"> #include <gtk/gtk.h><AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A>* <AHREF="gtk-graphics-contexts.html#GTK-GC-GET">gtk_gc_get</A> (<AHREF=../glib/glib-basic-types.html#GINT>gint</A> depth, <AHREF=../gdk/gdk-colormaps-and-colors.html#GDKCOLORMAP>GdkColormap</A> *colormap, <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUES>GdkGCValues</A> *values, <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUESMASK>GdkGCValuesMask</A> values_mask);void <AHREF="gtk-graphics-contexts.html#GTK-GC-RELEASE">gtk_gc_release</A> (<AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> *gc);</PRE></TD></TR></TABLE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1192"></A><H2>Description</H2><P>These functions provide access to a shared pool of <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> objects.When a new <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> is needed, <AHREF="gtk-graphics-contexts.html#GTK-GC-GET">gtk_gc_get</A>() is called with the required depth,colormap and <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUES>GdkGCValues</A>. If a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> with the required properties alreadyexists then that is returned. If not, a new <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> is created.When the <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> is no longer needed, <AHREF="gtk-graphics-contexts.html#GTK-GC-RELEASE">gtk_gc_release</A>() is called.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1203"></A><H2>Details</H2><DIVCLASS="REFSECT2"><ANAME="AEN1205"></A><H3><ANAME="GTK-GC-GET"></A>gtk_gc_get ()</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING"><AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A>* gtk_gc_get (<AHREF=../glib/glib-basic-types.html#GINT>gint</A> depth, <AHREF=../gdk/gdk-colormaps-and-colors.html#GDKCOLORMAP>GdkColormap</A> *colormap, <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUES>GdkGCValues</A> *values, <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUESMASK>GdkGCValuesMask</A> values_mask);</PRE></TD></TR></TABLE><P>Gets a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> with the given depth, colormap and <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUES>GdkGCValues</A>.If a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> with the given properties already exists then it is returned,otherwise a new <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> is created.The returned <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> should be released with <AHREF="gtk-graphics-contexts.html#GTK-GC-RELEASE">gtk_gc_release</A>() when it is nolonger needed.</P><DIVCLASS="INFORMALTABLE"><ANAME="AEN1221"></A><P></P><TABLEBORDER="0"WIDTH="100%"BGCOLOR="#FFD0D0"CELLSPACING="0"CELLPADDING="4"CLASS="CALSTABLE"><TBODY><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>depth</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the depth of the <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> to create.</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>colormap</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the <AHREF=../gdk/gdk-colormaps-and-colors.html#GDKCOLORMAP>GdkColormap</A> (FIXME: I don't know why this is needed).</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>values</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGCVALUES>GdkGCValues</A> struct containing settings for the <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A>.</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>values_mask</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">a set of flags indicating which of the fields in <TTCLASS="PARAMETER"><I>values</I></TT> hasbeen set.</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><ICLASS="EMPHASIS">Returns</I> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A>. </TD></TR></TBODY></TABLE><P></P></DIV></DIV><HR><DIVCLASS="REFSECT2"><ANAME="AEN1252"></A><H3><ANAME="GTK-GC-RELEASE"></A>gtk_gc_release ()</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING">void gtk_gc_release (<AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> *gc);</PRE></TD></TR></TABLE><P>Releases a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A> allocated using <AHREF="gtk-graphics-contexts.html#GTK-GC-GET">gtk_gc_get</A>().</P><DIVCLASS="INFORMALTABLE"><ANAME="AEN1260"></A><P></P><TABLEBORDER="0"WIDTH="100%"BGCOLOR="#FFD0D0"CELLSPACING="0"CELLPADDING="4"CLASS="CALSTABLE"><TBODY><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>gc</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">a <AHREF=../gdk/gdk-graphics-contexts.html#GDKGC>GdkGC</A>. </TD></TR></TBODY></TABLE><P></P></DIV></DIV></DIV><DIVCLASS="NAVFOOTER"><BRCLEAR="all"><BR><TABLEWIDTH="100%"BORDER="0"BGCOLOR="#000000"CELLPADDING="1"CELLSPACING="0"><TR><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="left"><AHREF="gtk-feature-test-macros.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B><<< Previous Page</B></FONT></A></TD><TDWIDTH="25%"BGCOLOR="#0000C0"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="index.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Home</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#00C000"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="gtk.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Up</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="right"><AHREF="gtk-styles.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Next Page >>></B></FONT></A></TD></TR><TR><TDCOLSPAN="2"ALIGN="left"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Version Information</B></FONT></TD><TDCOLSPAN="2"ALIGN="right"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Styles</B></FONT></TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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