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<a name="GdkDrawingContext"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GdkDrawingContext.top_of_page"></a>GdkDrawingContext</span></h2>
<p>GdkDrawingContext — Drawing context for GDK windows</p>
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<div class="refsect1">
<a name="GdkDrawingContext.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="gdk3-Windows.html#GdkWindow"><span class="returnvalue">GdkWindow</span></a> *
</td>
<td class="function_name">
<a class="link" href="GdkDrawingContext.html#gdk-drawing-context-get-window" title="gdk_drawing_context_get_window ()">gdk_drawing_context_get_window</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">cairo_region_t</span> *
</td>
<td class="function_name">
<a class="link" href="GdkDrawingContext.html#gdk-drawing-context-get-clip" title="gdk_drawing_context_get_clip ()">gdk_drawing_context_get_clip</a> <span class="c_punctuation">()</span>
</td>
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<tr>
<td class="function_type">
<span class="returnvalue">cairo_t</span> *
</td>
<td class="function_name">
<a class="link" href="GdkDrawingContext.html#gdk-drawing-context-get-cairo-context" title="gdk_drawing_context_get_cairo_context ()">gdk_drawing_context_get_cairo_context</a> <span class="c_punctuation">()</span>
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<td class="function_type">
<a href="/home/vagrant/ruby-gnome2.win64/glib2/vendor/local/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GdkDrawingContext.html#gdk-drawing-context-is-valid" title="gdk_drawing_context_is_valid ()">gdk_drawing_context_is_valid</a> <span class="c_punctuation">()</span>
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<div class="refsect1">
<a name="GdkDrawingContext.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<span class="type">CairoRegion</span> *</td>
<td class="property_name"><a class="link" href="GdkDrawingContext.html#GdkDrawingContext--clip" title="The “clip” property">clip</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type">
<a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a> *</td>
<td class="property_name"><a class="link" href="GdkDrawingContext.html#GdkDrawingContext--window" title="The “window” property">window</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GdkDrawingContext.html#GdkDrawingContext-struct" title="GdkDrawingContext">GdkDrawingContext</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/home/vagrant/ruby-gnome2.win64/glib2/vendor/local/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> GdkDrawingContext
</pre>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gdk/gdk.h>
</pre>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.description"></a><h2>Description</h2>
<p><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> is an object that represents the current drawing
state of a <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a>.</p>
<p>It's possible to use a <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> to draw on a <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a>
via rendering API like Cairo or OpenGL.</p>
<p>A <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> can only be created by calling <a class="link" href="gdk3-Windows.html#gdk-window-begin-draw-frame" title="gdk_window_begin_draw_frame ()"><code class="function">gdk_window_begin_draw_frame()</code></a>
and will be valid until a call to <a class="link" href="gdk3-Windows.html#gdk-window-end-draw-frame" title="gdk_window_end_draw_frame ()"><code class="function">gdk_window_end_draw_frame()</code></a>.</p>
<p><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> is available since GDK 3.22</p>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gdk-drawing-context-get-window"></a><h3>gdk_drawing_context_get_window ()</h3>
<pre class="programlisting"><a class="link" href="gdk3-Windows.html#GdkWindow"><span class="returnvalue">GdkWindow</span></a> *
gdk_drawing_context_get_window (<em class="parameter"><code><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> *context</code></em>);</pre>
<p>Retrieves the window that created the drawing <em class="parameter"><code>context</code></em>
.</p>
<div class="refsect3">
<a name="gdk-drawing-context-get-window.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-drawing-context-get-window.returns"></a><h4>Returns</h4>
<p> a <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a>. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-drawing-context-get-clip"></a><h3>gdk_drawing_context_get_clip ()</h3>
<pre class="programlisting"><span class="returnvalue">cairo_region_t</span> *
gdk_drawing_context_get_clip (<em class="parameter"><code><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> *context</code></em>);</pre>
<p>Retrieves a copy of the clip region used when creating the <em class="parameter"><code>context</code></em>
.</p>
<div class="refsect3">
<a name="gdk-drawing-context-get-clip.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-drawing-context-get-clip.returns"></a><h4>Returns</h4>
<p> a Cairo region. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-drawing-context-get-cairo-context"></a><h3>gdk_drawing_context_get_cairo_context ()</h3>
<pre class="programlisting"><span class="returnvalue">cairo_t</span> *
gdk_drawing_context_get_cairo_context (<em class="parameter"><code><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> *context</code></em>);</pre>
<p>Retrieves a Cairo context to be used to draw on the <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a>
that created the <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a>.</p>
<p>The returned context is guaranteed to be valid as long as the
<a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> is valid, that is between a call to
<a class="link" href="gdk3-Windows.html#gdk-window-begin-draw-frame" title="gdk_window_begin_draw_frame ()"><code class="function">gdk_window_begin_draw_frame()</code></a> and <a class="link" href="gdk3-Windows.html#gdk-window-end-draw-frame" title="gdk_window_end_draw_frame ()"><code class="function">gdk_window_end_draw_frame()</code></a>.</p>
<div class="refsect3">
<a name="gdk-drawing-context-get-cairo-context.returns"></a><h4>Returns</h4>
<p> a Cairo context to be used to draw
the contents of the <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a>. The context is owned by the
<a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> and should not be destroyed. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-drawing-context-is-valid"></a><h3>gdk_drawing_context_is_valid ()</h3>
<pre class="programlisting"><a href="/home/vagrant/ruby-gnome2.win64/glib2/vendor/local/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gdk_drawing_context_is_valid (<em class="parameter"><code><a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> *context</code></em>);</pre>
<p>Checks whether the given <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a> is valid.</p>
<div class="refsect3">
<a name="gdk-drawing-context-is-valid.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdkDrawingContext.html" title="GdkDrawingContext"><span class="type">GdkDrawingContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-drawing-context-is-valid.returns"></a><h4>Returns</h4>
<p> <a href="/home/vagrant/ruby-gnome2.win64/glib2/vendor/local/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the context is valid</p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
</div>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GdkDrawingContext-struct"></a><h3>GdkDrawingContext</h3>
<pre class="programlisting">typedef struct _GdkDrawingContext GdkDrawingContext;</pre>
</div>
</div>
<div class="refsect1">
<a name="GdkDrawingContext.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GdkDrawingContext--clip"></a><h3>The <code class="literal">“clip”</code> property</h3>
<pre class="programlisting"> “clip” <span class="type">CairoRegion</span> *</pre>
<p>The clip region applied to the drawing context.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GdkDrawingContext--window"></a><h3>The <code class="literal">“window”</code> property</h3>
<pre class="programlisting"> “window” <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a> *</pre>
<p>The <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a> that created the drawing context.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since: <a class="link" href="api-index-3-22.html#api-index-3.22">3.22</a></p>
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