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<a href="#pango-Bidirectional-Text.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<a name="pango-Bidirectional-Text"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="pango-Bidirectional-Text.top_of_page"></a>Bidirectional Text</span></h2>
<p>Bidirectional Text — Types and functions to help with handling bidirectional text</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.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="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="returnvalue">PangoDirection</span></a>
</td>
<td class="function_name">
<a class="link" href="pango-Bidirectional-Text.html#pango-unichar-direction" title="pango_unichar_direction ()">pango_unichar_direction</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="returnvalue">PangoDirection</span></a>
</td>
<td class="function_name">
<a class="link" href="pango-Bidirectional-Text.html#pango-find-base-dir" title="pango_find_base_dir ()">pango_find_base_dir</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="pango-Bidirectional-Text.html#pango-get-mirror-char" title="pango_get_mirror_char ()">pango_get_mirror_char</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="pango-Bidirectional-Text.html#PangoBidiType" title="enum PangoBidiType"><span class="returnvalue">PangoBidiType</span></a>
</td>
<td class="function_name">
<a class="link" href="pango-Bidirectional-Text.html#pango-bidi-type-for-unichar" title="pango_bidi_type_for_unichar ()">pango_bidi_type_for_unichar</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.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">enum</td>
<td class="function_name"><a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection">PangoDirection</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="pango-Bidirectional-Text.html#PangoBidiType" title="enum PangoBidiType">PangoBidiType</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GEnum
<span class="lineart">├──</span> PangoBidiType
<span class="lineart">╰──</span> PangoDirection
</pre>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.description"></a><h2>Description</h2>
<p>Pango supports bidirectional text (like Arabic and Hebrew) automatically.
Some applications however, need some help to correctly handle bidirectional text.</p>
<p>The <a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="type">PangoDirection</span></a> type can be used with <a class="link" href="pango-Text-Processing.html#pango-context-set-base-dir" title="pango_context_set_base_dir ()"><code class="function">pango_context_set_base_dir()</code></a> to
instruct Pango about direction of text, though in most cases Pango detects
that correctly and automatically. The rest of the facilities in this section
are used internally by Pango already, and are provided to help applications
that need more direct control over bidirectional setting of text.</p>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="pango-unichar-direction"></a><h3>pango_unichar_direction ()</h3>
<pre class="programlisting"><a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="returnvalue">PangoDirection</span></a>
pango_unichar_direction (<em class="parameter"><code><span class="type">gunichar</span> ch</code></em>);</pre>
<p>Determines the inherent direction of a character; either
<a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-LTR:CAPS"><code class="literal">PANGO_DIRECTION_LTR</code></a>, <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-RTL:CAPS"><code class="literal">PANGO_DIRECTION_RTL</code></a>, or
<a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-NEUTRAL:CAPS"><code class="literal">PANGO_DIRECTION_NEUTRAL</code></a>.</p>
<p>This function is useful to categorize characters into left-to-right
letters, right-to-left letters, and everything else. If full
Unicode bidirectional type of a character is needed,
<a class="link" href="pango-Bidirectional-Text.html#pango-bidi-type-for-unichar" title="pango_bidi_type_for_unichar ()"><code class="function">pango_bidi_type_for_unichar()</code></a> can be used instead.</p>
<div class="refsect3">
<a name="pango-unichar-direction.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>ch</p></td>
<td class="parameter_description"><p>a Unicode character</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="pango-unichar-direction.returns"></a><h4>Returns</h4>
<p> the direction of the character.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="pango-find-base-dir"></a><h3>pango_find_base_dir ()</h3>
<pre class="programlisting"><a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="returnvalue">PangoDirection</span></a>
pango_find_base_dir (<em class="parameter"><code>const <span class="type">gchar</span> *text</code></em>,
<em class="parameter"><code><span class="type">gint</span> length</code></em>);</pre>
<p>Searches a string the first character that has a strong
direction, according to the Unicode bidirectional algorithm.</p>
<div class="refsect3">
<a name="pango-find-base-dir.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>text</p></td>
<td class="parameter_description"><p>the text to process</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>length of <em class="parameter"><code>text</code></em>
in bytes (may be -1 if <em class="parameter"><code>text</code></em>
is nul-terminated)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="pango-find-base-dir.returns"></a><h4>Returns</h4>
<p> The direction corresponding to the first strong character.
If no such character is found, then <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-NEUTRAL:CAPS"><code class="literal">PANGO_DIRECTION_NEUTRAL</code></a> is returned.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-1-4.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="pango-get-mirror-char"></a><h3>pango_get_mirror_char ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
pango_get_mirror_char (<em class="parameter"><code><span class="type">gunichar</span> ch</code></em>,
<em class="parameter"><code><span class="type">gunichar</span> *mirrored_ch</code></em>);</pre>
<div class="warning"><p><code class="literal">pango_get_mirror_char</code> is deprecated and should not be used in newly-written code.</p></div>
<p>If <em class="parameter"><code>ch</code></em>
has the Unicode mirrored property and there is another Unicode
character that typically has a glyph that is the mirror image of <em class="parameter"><code>ch</code></em>
's
glyph, puts that character in the address pointed to by <em class="parameter"><code>mirrored_ch</code></em>
.</p>
<p>Use <code class="function">g_unichar_get_mirror_char()</code> instead; the docs for that function
provide full details.</p>
<div class="refsect3">
<a name="pango-get-mirror-char.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>ch</p></td>
<td class="parameter_description"><p>a Unicode character</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mirrored_ch</p></td>
<td class="parameter_description"><p>location to store the mirrored character</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="pango-get-mirror-char.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if <em class="parameter"><code>ch</code></em>
has a mirrored character and <em class="parameter"><code>mirrored_ch</code></em>
is
filled in, <code class="literal">FALSE</code> otherwise</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="pango-bidi-type-for-unichar"></a><h3>pango_bidi_type_for_unichar ()</h3>
<pre class="programlisting"><a class="link" href="pango-Bidirectional-Text.html#PangoBidiType" title="enum PangoBidiType"><span class="returnvalue">PangoBidiType</span></a>
pango_bidi_type_for_unichar (<em class="parameter"><code><span class="type">gunichar</span> ch</code></em>);</pre>
<p>Determines the normative bidirectional character type of a
character, as specified in the Unicode Character Database.</p>
<p>A simplified version of this function is available as
<a class="link" href="pango-Bidirectional-Text.html#pango-unichar-direction" title="pango_unichar_direction ()"><code class="function">pango_unichar_direction()</code></a>.</p>
<div class="refsect3">
<a name="pango-bidi-type-for-unichar.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>ch</p></td>
<td class="parameter_description"><p>a Unicode character</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="pango-bidi-type-for-unichar.returns"></a><h4>Returns</h4>
<p> the bidirectional character type, as used in the
Unicode bidirectional algorithm.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-1-22.html#api-index-1.22">1.22</a></p>
</div>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="PangoDirection"></a><h3>enum PangoDirection</h3>
<p>The <a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="type">PangoDirection</span></a> type represents a direction in the
Unicode bidirectional algorithm; not every value in this
enumeration makes sense for every usage of <a class="link" href="pango-Bidirectional-Text.html#PangoDirection" title="enum PangoDirection"><span class="type">PangoDirection</span></a>;
for example, the return value of <a class="link" href="pango-Bidirectional-Text.html#pango-unichar-direction" title="pango_unichar_direction ()"><code class="function">pango_unichar_direction()</code></a>
and <a class="link" href="pango-Bidirectional-Text.html#pango-find-base-dir" title="pango_find_base_dir ()"><code class="function">pango_find_base_dir()</code></a> cannot be <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-WEAK-LTR:CAPS"><code class="literal">PANGO_DIRECTION_WEAK_LTR</code></a>
or <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-WEAK-RTL:CAPS"><code class="literal">PANGO_DIRECTION_WEAK_RTL</code></a>, since every character is either
neutral or has a strong direction; on the other hand
<a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-NEUTRAL:CAPS"><code class="literal">PANGO_DIRECTION_NEUTRAL</code></a> doesn't make sense to pass
to <a class="link" href="pango-Text-Processing.html#pango-itemize-with-base-dir" title="pango_itemize_with_base_dir ()"><code class="function">pango_itemize_with_base_dir()</code></a>.</p>
<p>The <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-TTB-LTR:CAPS"><code class="literal">PANGO_DIRECTION_TTB_LTR</code></a>, <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-TTB-RTL:CAPS"><code class="literal">PANGO_DIRECTION_TTB_RTL</code></a>
values come from an earlier interpretation of this
enumeration as the writing direction of a block of
text and are no longer used; See <a class="link" href="pango-Vertical-Text.html#PangoGravity" title="enum PangoGravity"><span class="type">PangoGravity</span></a> for how
vertical text is handled in Pango.</p>
<div class="refsect3">
<a name="PangoDirection.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="PANGO-DIRECTION-LTR:CAPS"></a>PANGO_DIRECTION_LTR</p></td>
<td class="enum_member_description">
<p>A strong left-to-right direction</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-RTL:CAPS"></a>PANGO_DIRECTION_RTL</p></td>
<td class="enum_member_description">
<p>A strong right-to-left direction</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-TTB-LTR:CAPS"></a>PANGO_DIRECTION_TTB_LTR</p></td>
<td class="enum_member_description">
<p>Deprecated value; treated the
same as <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-RTL:CAPS"><code class="literal">PANGO_DIRECTION_RTL</code></a>.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-TTB-RTL:CAPS"></a>PANGO_DIRECTION_TTB_RTL</p></td>
<td class="enum_member_description">
<p>Deprecated value; treated the
same as <a class="link" href="pango-Bidirectional-Text.html#PANGO-DIRECTION-LTR:CAPS"><code class="literal">PANGO_DIRECTION_LTR</code></a></p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-WEAK-LTR:CAPS"></a>PANGO_DIRECTION_WEAK_LTR</p></td>
<td class="enum_member_description">
<p>A weak left-to-right direction</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-WEAK-RTL:CAPS"></a>PANGO_DIRECTION_WEAK_RTL</p></td>
<td class="enum_member_description">
<p>A weak right-to-left direction</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-DIRECTION-NEUTRAL:CAPS"></a>PANGO_DIRECTION_NEUTRAL</p></td>
<td class="enum_member_description">
<p>No direction specified</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="PangoBidiType"></a><h3>enum PangoBidiType</h3>
<p>The <a class="link" href="pango-Bidirectional-Text.html#PangoBidiType" title="enum PangoBidiType"><span class="type">PangoBidiType</span></a> type represents the bidirectional character
type of a Unicode character as specified by the</p>
<a class="ulink" href="http://www.unicode.org/reports/tr9/" target="_top">Unicode bidirectional algorithm</a>.
<div class="refsect3">
<a name="PangoBidiType.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="PANGO-BIDI-TYPE-L:CAPS"></a>PANGO_BIDI_TYPE_L</p></td>
<td class="enum_member_description">
<p>Left-to-Right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-LRE:CAPS"></a>PANGO_BIDI_TYPE_LRE</p></td>
<td class="enum_member_description">
<p>Left-to-Right Embedding</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-LRO:CAPS"></a>PANGO_BIDI_TYPE_LRO</p></td>
<td class="enum_member_description">
<p>Left-to-Right Override</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-R:CAPS"></a>PANGO_BIDI_TYPE_R</p></td>
<td class="enum_member_description">
<p>Right-to-Left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-AL:CAPS"></a>PANGO_BIDI_TYPE_AL</p></td>
<td class="enum_member_description">
<p>Right-to-Left Arabic</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-RLE:CAPS"></a>PANGO_BIDI_TYPE_RLE</p></td>
<td class="enum_member_description">
<p>Right-to-Left Embedding</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-RLO:CAPS"></a>PANGO_BIDI_TYPE_RLO</p></td>
<td class="enum_member_description">
<p>Right-to-Left Override</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-PDF:CAPS"></a>PANGO_BIDI_TYPE_PDF</p></td>
<td class="enum_member_description">
<p>Pop Directional Format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-EN:CAPS"></a>PANGO_BIDI_TYPE_EN</p></td>
<td class="enum_member_description">
<p>European Number</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-ES:CAPS"></a>PANGO_BIDI_TYPE_ES</p></td>
<td class="enum_member_description">
<p>European Number Separator</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-ET:CAPS"></a>PANGO_BIDI_TYPE_ET</p></td>
<td class="enum_member_description">
<p>European Number Terminator</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-AN:CAPS"></a>PANGO_BIDI_TYPE_AN</p></td>
<td class="enum_member_description">
<p>Arabic Number</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-CS:CAPS"></a>PANGO_BIDI_TYPE_CS</p></td>
<td class="enum_member_description">
<p>Common Number Separator</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-NSM:CAPS"></a>PANGO_BIDI_TYPE_NSM</p></td>
<td class="enum_member_description">
<p>Nonspacing Mark</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-BN:CAPS"></a>PANGO_BIDI_TYPE_BN</p></td>
<td class="enum_member_description">
<p>Boundary Neutral</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-B:CAPS"></a>PANGO_BIDI_TYPE_B</p></td>
<td class="enum_member_description">
<p>Paragraph Separator</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-S:CAPS"></a>PANGO_BIDI_TYPE_S</p></td>
<td class="enum_member_description">
<p>Segment Separator</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-WS:CAPS"></a>PANGO_BIDI_TYPE_WS</p></td>
<td class="enum_member_description">
<p>Whitespace</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="PANGO-BIDI-TYPE-ON:CAPS"></a>PANGO_BIDI_TYPE_ON</p></td>
<td class="enum_member_description">
<p>Other Neutrals</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-1-22.html#api-index-1.22">1.22</a></p>
</div>
</div>
<div class="refsect1">
<a name="pango-Bidirectional-Text.see-also"></a><h2>See Also</h2>
<p>pango_context_get_base_dir(),
<a class="link" href="pango-Text-Processing.html#pango-context-set-base-dir" title="pango_context_set_base_dir ()"><code class="function">pango_context_set_base_dir()</code></a>,
<a class="link" href="pango-Text-Processing.html#pango-itemize-with-base-dir" title="pango_itemize_with_base_dir ()"><code class="function">pango_itemize_with_base_dir()</code></a></p>
</div>
</div>
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