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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Visuals: GDK 2 Reference Manual</title>
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<div class="refentry">
<a name="gdk2-Visuals"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gdk2-Visuals.top_of_page"></a>Visuals</span></h2>
<p>Visuals</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gdk2-Visuals.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-query-depths" title="gdk_query_depths ()">gdk_query_depths</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-query-visual-types" title="gdk_query_visual_types ()">gdk_query_visual_types</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GList</span> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-list-visuals" title="gdk_list_visuals ()">gdk_list_visuals</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-depth" title="gdk_visual_get_best_depth ()">gdk_visual_get_best_depth</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="returnvalue">GdkVisualType</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-type" title="gdk_visual_get_best_type ()">gdk_visual_get_best_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-system" title="gdk_visual_get_system ()">gdk_visual_get_system</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best" title="gdk_visual_get_best ()">gdk_visual_get_best</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-with-depth" title="gdk_visual_get_best_with_depth ()">gdk_visual_get_best_with_depth</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-with-type" title="gdk_visual_get_best_with_type ()">gdk_visual_get_best_with_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-with-both" title="gdk_visual_get_best_with_both ()">gdk_visual_get_best_with_both</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-ref" title="gdk_visual_ref()">gdk_visual_ref</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-unref" title="gdk_visual_unref()">gdk_visual_unref</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GdkScreen.html" title="GdkScreen"><span class="returnvalue">GdkScreen</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-screen" title="gdk_visual_get_screen ()">gdk_visual_get_screen</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-bits-per-rgb" title="gdk_visual_get_bits_per_rgb ()">gdk_visual_get_bits_per_rgb</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-blue-pixel-details" title="gdk_visual_get_blue_pixel_details ()">gdk_visual_get_blue_pixel_details</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkByteOrder" title="enum GdkByteOrder"><span class="returnvalue">GdkByteOrder</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-byte-order" title="gdk_visual_get_byte_order ()">gdk_visual_get_byte_order</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-colormap-size" title="gdk_visual_get_colormap_size ()">gdk_visual_get_colormap_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-depth" title="gdk_visual_get_depth ()">gdk_visual_get_depth</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-green-pixel-details" title="gdk_visual_get_green_pixel_details ()">gdk_visual_get_green_pixel_details</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-red-pixel-details" title="gdk_visual_get_red_pixel_details ()">gdk_visual_get_red_pixel_details</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="returnvalue">GdkVisualType</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk2-Visuals.html#gdk-visual-get-visual-type" title="gdk_visual_get_visual_type ()">gdk_visual_get_visual_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gdk2-Visuals.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual">GdkVisual</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType">GdkVisualType</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gdk2-Visuals.html#GdkByteOrder" title="enum GdkByteOrder">GdkByteOrder</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gdk2-Visuals.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gdk/gdk.h>
</pre>
</div>
<div class="refsect1">
<a name="gdk2-Visuals.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="gdk2-Visuals.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gdk-query-depths"></a><h3>gdk_query_depths ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_query_depths (<em class="parameter"><code><span class="type">gint</span> **depths</code></em>,
<em class="parameter"><code><span class="type">gint</span> *count</code></em>);</pre>
<p>This function returns the available bit depths for the default
screen. It's equivalent to listing the visuals
(<a class="link" href="gdk2-Visuals.html#gdk-list-visuals" title="gdk_list_visuals ()"><code class="function">gdk_list_visuals()</code></a>) and then looking at the depth field in each
visual, removing duplicates.</p>
<p>The array returned by this function should not be freed.</p>
<div class="refsect3">
<a name="gdk-query-depths.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>depths</p></td>
<td class="parameter_description"><p>return location for available depths. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>count</p></td>
<td class="parameter_description"><p>return location for number of available depths. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-query-visual-types"></a><h3>gdk_query_visual_types ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_query_visual_types (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="type">GdkVisualType</span></a> **visual_types</code></em>,
<em class="parameter"><code><span class="type">gint</span> *count</code></em>);</pre>
<p>This function returns the available visual types for the default
screen. It's equivalent to listing the visuals
(<a class="link" href="gdk2-Visuals.html#gdk-list-visuals" title="gdk_list_visuals ()"><code class="function">gdk_list_visuals()</code></a>) and then looking at the type field in each
visual, removing duplicates.</p>
<p>The array returned by this function should not be freed.</p>
<div class="refsect3">
<a name="gdk-query-visual-types.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>visual_types</p></td>
<td class="parameter_description"><p>return location for the available visual types</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>count</p></td>
<td class="parameter_description"><p>return location for the number of available visual types</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-list-visuals"></a><h3>gdk_list_visuals ()</h3>
<pre class="programlisting"><span class="returnvalue">GList</span> *
gdk_list_visuals (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Lists the available visuals for the default screen.
(See <a class="link" href="GdkScreen.html#gdk-screen-list-visuals" title="gdk_screen_list_visuals ()"><code class="function">gdk_screen_list_visuals()</code></a>)
A visual describes a hardware image data format.
For example, a visual might support 24-bit color, or 8-bit color,
and might expect pixels to be in a certain format.</p>
<p>Call <code class="function">g_list_free()</code> on the return value when you're finished with it.</p>
<div class="refsect3">
<a name="gdk-list-visuals.returns"></a><h4>Returns</h4>
<p>a list of visuals; the list must be freed, but not its contents. </p>
<p><span class="annotation">[<acronym title="Free data container after the code is done."><span class="acronym">transfer container</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> GdkVisual]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best-depth"></a><h3>gdk_visual_get_best_depth ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gdk_visual_get_best_depth (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Get the best available depth for the default GDK screen. "Best"
means "largest," i.e. 32 preferred over 24 preferred over 8 bits
per pixel.</p>
<div class="refsect3">
<a name="gdk-visual-get-best-depth.returns"></a><h4>Returns</h4>
<p> best available depth</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best-type"></a><h3>gdk_visual_get_best_type ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="returnvalue">GdkVisualType</span></a>
gdk_visual_get_best_type (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Return the best available visual type for the default GDK screen.</p>
<div class="refsect3">
<a name="gdk-visual-get-best-type.returns"></a><h4>Returns</h4>
<p> best visual type</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-system"></a><h3>gdk_visual_get_system ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
gdk_visual_get_system (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Get the system's default visual for the default GDK screen.
This is the visual for the root window of the display.
The return value should not be freed.</p>
<div class="refsect3">
<a name="gdk-visual-get-system.returns"></a><h4>Returns</h4>
<p>system visual. </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>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best"></a><h3>gdk_visual_get_best ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
gdk_visual_get_best (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Get the visual with the most available colors for the default
GDK screen. The return value should not be freed.</p>
<div class="refsect3">
<a name="gdk-visual-get-best.returns"></a><h4>Returns</h4>
<p>best visual. </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>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best-with-depth"></a><h3>gdk_visual_get_best_with_depth ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
gdk_visual_get_best_with_depth (<em class="parameter"><code><span class="type">gint</span> depth</code></em>);</pre>
<p>Get the best visual with depth <em class="parameter"><code>depth</code></em>
for the default GDK screen.
Color visuals and visuals with mutable colormaps are preferred
over grayscale or fixed-colormap visuals. The return value should not
be freed. <code class="literal">NULL</code> may be returned if no visual supports <em class="parameter"><code>depth</code></em>
.</p>
<div class="refsect3">
<a name="gdk-visual-get-best-with-depth.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>depth</p></td>
<td class="parameter_description"><p>a bit depth</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-best-with-depth.returns"></a><h4>Returns</h4>
<p>best visual for the given depth. </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>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best-with-type"></a><h3>gdk_visual_get_best_with_type ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
gdk_visual_get_best_with_type (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="type">GdkVisualType</span></a> visual_type</code></em>);</pre>
<p>Get the best visual of the given <em class="parameter"><code>visual_type</code></em>
for the default GDK screen.
Visuals with higher color depths are considered better. The return value
should not be freed. <code class="literal">NULL</code> may be returned if no visual has type
<em class="parameter"><code>visual_type</code></em>
.</p>
<div class="refsect3">
<a name="gdk-visual-get-best-with-type.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>visual_type</p></td>
<td class="parameter_description"><p>a visual type</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-best-with-type.returns"></a><h4>Returns</h4>
<p>best visual of the given type. </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>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-best-with-both"></a><h3>gdk_visual_get_best_with_both ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="returnvalue">GdkVisual</span></a> *
gdk_visual_get_best_with_both (<em class="parameter"><code><span class="type">gint</span> depth</code></em>,
<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="type">GdkVisualType</span></a> visual_type</code></em>);</pre>
<p>Combines <a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-with-depth" title="gdk_visual_get_best_with_depth ()"><code class="function">gdk_visual_get_best_with_depth()</code></a> and <a class="link" href="gdk2-Visuals.html#gdk-visual-get-best-with-type" title="gdk_visual_get_best_with_type ()"><code class="function">gdk_visual_get_best_with_type()</code></a>.</p>
<div class="refsect3">
<a name="gdk-visual-get-best-with-both.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>depth</p></td>
<td class="parameter_description"><p>a bit depth</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>visual_type</p></td>
<td class="parameter_description"><p>a visual type</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-best-with-both.returns"></a><h4>Returns</h4>
<p>best visual with both <em class="parameter"><code>depth</code></em>
and
<em class="parameter"><code>visual_type</code></em>
, or <code class="literal">NULL</code> if none. </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>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-ref"></a><h3>gdk_visual_ref()</h3>
<pre class="programlisting">#define gdk_visual_ref(v) g_object_ref(v)
</pre>
<div class="warning"><p><code class="literal">gdk_visual_ref</code> is deprecated and should not be used in newly-written code.</p></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-unref"></a><h3>gdk_visual_unref()</h3>
<pre class="programlisting">#define gdk_visual_unref(v) g_object_unref(v)
</pre>
<div class="warning"><p><code class="literal">gdk_visual_unref</code> is deprecated and should not be used in newly-written code.</p></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-screen"></a><h3>gdk_visual_get_screen ()</h3>
<pre class="programlisting"><a class="link" href="GdkScreen.html" title="GdkScreen"><span class="returnvalue">GdkScreen</span></a> *
gdk_visual_get_screen (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Gets the screen to which this visual belongs</p>
<div class="refsect3">
<a name="gdk-visual-get-screen.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>visual</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-screen.returns"></a><h4>Returns</h4>
<p>the screen to which this visual belongs. </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-2-2.html#api-index-2.2">2.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-bits-per-rgb"></a><h3>gdk_visual_get_bits_per_rgb ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gdk_visual_get_bits_per_rgb (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Returns the number of significant bits per red, green and blue value.</p>
<div class="refsect3">
<a name="gdk-visual-get-bits-per-rgb.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>visual</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-bits-per-rgb.returns"></a><h4>Returns</h4>
<p> The number of significant bits per color value for <em class="parameter"><code>visual</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-blue-pixel-details"></a><h3>gdk_visual_get_blue_pixel_details ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_visual_get_blue_pixel_details (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>,
<em class="parameter"><code><span class="type">guint32</span> *mask</code></em>,
<em class="parameter"><code><span class="type">gint</span> *shift</code></em>,
<em class="parameter"><code><span class="type">gint</span> *precision</code></em>);</pre>
<p>Obtains values that are needed to calculate blue pixel values in TrueColor
and DirectColor. The "mask" is the significant bits within the pixel.
The "shift" is the number of bits left we must shift a primary for it
to be in position (according to the "mask"). Finally, "precision" refers
to how much precision the pixel value contains for a particular primary.</p>
<div class="refsect3">
<a name="gdk-visual-get-blue-pixel-details.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>visual</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mask</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">guint32</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>shift</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>precision</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-byte-order"></a><h3>gdk_visual_get_byte_order ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkByteOrder" title="enum GdkByteOrder"><span class="returnvalue">GdkByteOrder</span></a>
gdk_visual_get_byte_order (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Returns the byte order of this visual.</p>
<div class="refsect3">
<a name="gdk-visual-get-byte-order.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>visual</p></td>
<td class="parameter_description"><p>A <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-byte-order.returns"></a><h4>Returns</h4>
<p> A <a class="link" href="gdk2-Visuals.html#GdkByteOrder" title="enum GdkByteOrder"><span class="type">GdkByteOrder</span></a> stating the byte order of <em class="parameter"><code>visual</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-colormap-size"></a><h3>gdk_visual_get_colormap_size ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gdk_visual_get_colormap_size (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Returns the size of a colormap for this visual.</p>
<div class="refsect3">
<a name="gdk-visual-get-colormap-size.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>visual</p></td>
<td class="parameter_description"><p>A <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-colormap-size.returns"></a><h4>Returns</h4>
<p> The size of a colormap that is suitable for <em class="parameter"><code>visual</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-depth"></a><h3>gdk_visual_get_depth ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gdk_visual_get_depth (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Returns the bit depth of this visual.</p>
<div class="refsect3">
<a name="gdk-visual-get-depth.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>visual</p></td>
<td class="parameter_description"><p>A <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-depth.returns"></a><h4>Returns</h4>
<p> The bit depth of this visual.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-green-pixel-details"></a><h3>gdk_visual_get_green_pixel_details ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_visual_get_green_pixel_details (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>,
<em class="parameter"><code><span class="type">guint32</span> *mask</code></em>,
<em class="parameter"><code><span class="type">gint</span> *shift</code></em>,
<em class="parameter"><code><span class="type">gint</span> *precision</code></em>);</pre>
<p>Obtains values that are needed to calculate green pixel values in TrueColor
and DirectColor. The "mask" is the significant bits within the pixel.
The "shift" is the number of bits left we must shift a primary for it
to be in position (according to the "mask"). Finally, "precision" refers
to how much precision the pixel value contains for a particular primary.</p>
<div class="refsect3">
<a name="gdk-visual-get-green-pixel-details.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>visual</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mask</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">guint32</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>shift</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>precision</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-red-pixel-details"></a><h3>gdk_visual_get_red_pixel_details ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_visual_get_red_pixel_details (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>,
<em class="parameter"><code><span class="type">guint32</span> *mask</code></em>,
<em class="parameter"><code><span class="type">gint</span> *shift</code></em>,
<em class="parameter"><code><span class="type">gint</span> *precision</code></em>);</pre>
<p>Obtains values that are needed to calculate red pixel values in TrueColor
and DirectColor. The "mask" is the significant bits within the pixel.
The "shift" is the number of bits left we must shift a primary for it
to be in position (according to the "mask"). Finally, "precision" refers
to how much precision the pixel value contains for a particular primary.</p>
<div class="refsect3">
<a name="gdk-visual-get-red-pixel-details.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>visual</p></td>
<td class="parameter_description"><p>A <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mask</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">guint32</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>shift</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>precision</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">gint</span> to be filled in, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-visual-get-visual-type"></a><h3>gdk_visual_get_visual_type ()</h3>
<pre class="programlisting"><a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="returnvalue">GdkVisualType</span></a>
gdk_visual_get_visual_type (<em class="parameter"><code><a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a> *visual</code></em>);</pre>
<p>Returns the type of visual this is (PseudoColor, TrueColor, etc).</p>
<div class="refsect3">
<a name="gdk-visual-get-visual-type.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>visual</p></td>
<td class="parameter_description"><p>A <a class="link" href="gdk2-Visuals.html#GdkVisual" title="GdkVisual"><span class="type">GdkVisual</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-visual-get-visual-type.returns"></a><h4>Returns</h4>
<p> A <a class="link" href="gdk2-Visuals.html#GdkVisualType" title="enum GdkVisualType"><span class="type">GdkVisualType</span></a> stating the type of <em class="parameter"><code>visual</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
</div>
<div class="refsect1">
<a name="gdk2-Visuals.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GdkVisual"></a><h3>GdkVisual</h3>
<pre class="programlisting">typedef struct {
GObject parent_instance;
GdkVisualType GSEAL (type);
gint GSEAL (depth);
GdkByteOrder GSEAL (byte_order);
gint GSEAL (colormap_size);
gint GSEAL (bits_per_rgb);
guint32 GSEAL (red_mask);
gint GSEAL (red_shift);
gint GSEAL (red_prec);
guint32 GSEAL (green_mask);
gint GSEAL (green_shift);
gint GSEAL (green_prec);
guint32 GSEAL (blue_mask);
gint GSEAL (blue_shift);
gint GSEAL (blue_prec);
} GdkVisual;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GdkVisualType"></a><h3>enum GdkVisualType</h3>
<div class="refsect3">
<a name="GdkVisualType.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-STATIC-GRAY:CAPS"></a>GDK_VISUAL_STATIC_GRAY</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-GRAYSCALE:CAPS"></a>GDK_VISUAL_GRAYSCALE</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-STATIC-COLOR:CAPS"></a>GDK_VISUAL_STATIC_COLOR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-PSEUDO-COLOR:CAPS"></a>GDK_VISUAL_PSEUDO_COLOR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-TRUE-COLOR:CAPS"></a>GDK_VISUAL_TRUE_COLOR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-VISUAL-DIRECT-COLOR:CAPS"></a>GDK_VISUAL_DIRECT_COLOR</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GdkByteOrder"></a><h3>enum GdkByteOrder</h3>
<div class="refsect3">
<a name="GdkByteOrder.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GDK-LSB-FIRST:CAPS"></a>GDK_LSB_FIRST</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-MSB-FIRST:CAPS"></a>GDK_MSB_FIRST</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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