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<title>Pango Reference Manual: PangoEngineShape</title>
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<a href="#PangoEngineShape.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<a name="PangoEngineShape"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="PangoEngineShape.top_of_page"></a>PangoEngineShape</span></h2>
<p>PangoEngineShape — Rendering-system dependent script engines</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="PangoEngineShape.stability-level"></a><h2>Stability Level</h2>
<acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="PangoEngineShape.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody><tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="PangoEngineShape.html#PANGO-ENGINE-SHAPE-DEFINE-TYPE:CAPS" title="PANGO_ENGINE_SHAPE_DEFINE_TYPE()">PANGO_ENGINE_SHAPE_DEFINE_TYPE</a><span class="c_punctuation">()</span>
</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="PangoEngineShape.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table 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="PangoEngineShape.html#PangoEngineShape-struct" title="PangoEngineShape">PangoEngineShape</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="PangoEngineShape.html#PangoEngineShapeClass" title="struct PangoEngineShapeClass">PangoEngineShapeClass</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="PangoEngineShape.html#PANGO-ENGINE-TYPE-SHAPE:CAPS" title="PANGO_ENGINE_TYPE_SHAPE">PANGO_ENGINE_TYPE_SHAPE</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="PangoEngineShape.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
<span class="lineart">╰──</span> <a class="link" href="pango-Engines.html#PangoEngine">PangoEngine</a>
<span class="lineart">╰──</span> PangoEngineShape
</pre>
</div>
<div class="refsect1">
<a name="PangoEngineShape.description"></a><h2>Description</h2>
<p>The <em class="firstterm">shape engines</em> are rendering-system dependent
engines that convert character strings into glyph strings.
These engines are used in <a class="link" href="pango-Text-Processing.html#pango-shape" title="pango_shape ()"><code class="function">pango_shape()</code></a>.</p>
</div>
<div class="refsect1">
<a name="PangoEngineShape.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="PANGO-ENGINE-SHAPE-DEFINE-TYPE:CAPS"></a><h3>PANGO_ENGINE_SHAPE_DEFINE_TYPE()</h3>
<pre class="programlisting">#define PANGO_ENGINE_SHAPE_DEFINE_TYPE(name, prefix, class_init, instance_init)</pre>
<p>Outputs the necessary code for GObject type registration for a
<a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a> class defined in a module. Two static symbols
are defined.</p>
<pre class="programlisting">
static GType <em class="replaceable"><code>prefix</code></em>_type;
static void <em class="replaceable"><code>prefix</code></em>_register_type (GTypeModule module);
</pre>
<p>The <code class="function"><em class="replaceable"><code>prefix</code></em><code class="function">_register_type()</code></code>
function should be called in your <a class="link" href="pango-Engines.html#script-engine-init" title="script_engine_init ()"><code class="function">script_engine_init()</code></a> function for
each type that your module implements, and then your <a class="link" href="pango-Engines.html#script-engine-create" title="script_engine_create ()"><code class="function">script_engine_create()</code></a>
function can create instances of the object as follows:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">PangoEngine</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">engine </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a></span><span class="normal"> </span><span class="symbol">(<</span><span class="usertype">em</span><span class="normal"> class</span><span class="symbol">=</span><span class="string">"replaceable"</span><span class="symbol">><</span><span class="normal">code</span><span class="symbol">></span><span class="normal">prefix</span><span class="symbol"></</span><span class="normal">code</span><span class="symbol">></</span><span class="normal">em</span><span class="symbol">></span><span class="normal">_type</span><span class="symbol">,</span><span class="normal"> <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<div class="refsect3">
<a name="id-1.4.10.8.2.8"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>name</p></td>
<td class="parameter_description"><p>Name of the the type to register (for example:, <code class="literal">ArabicEngineFc</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prefix</p></td>
<td class="parameter_description"><p>Prefix for symbols that will be defined (for example:, <code class="literal">arabic_engine_fc</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>class_init</p></td>
<td class="parameter_description"><p>Class initialization function for the new type, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>instance_init</p></td>
<td class="parameter_description"><p>Instance initialization function for the new type, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
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</div>
<div class="refsect1">
<a name="PangoEngineShape.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="PangoEngineShape-struct"></a><h3>PangoEngineShape</h3>
<pre class="programlisting">typedef struct _PangoEngineShape PangoEngineShape;</pre>
<p>The <a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a> class is implemented by engines that
customize the rendering-system dependent part of the
Pango pipeline for a particular script or language.
A <a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a> implementation is then specific to both
a particular rendering system or group of rendering systems
and to a particular script. For instance, there is one
<a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a> implementation to handle shaping Arabic
for Fontconfig-based backends.</p>
</div>
<hr>
<div class="refsect2">
<a name="PangoEngineShapeClass"></a><h3>struct PangoEngineShapeClass</h3>
<pre class="programlisting">struct PangoEngineShapeClass {
void (*script_shape) (PangoEngineShape *engine,
PangoFont *font,
const char *item_text,
unsigned int item_length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs,
const char *paragraph_text,
unsigned int paragraph_length);
PangoCoverageLevel (*covers) (PangoEngineShape *engine,
PangoFont *font,
PangoLanguage *language,
gunichar wc);
};
</pre>
<p>Class structure for <a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a></p>
<div class="refsect3">
<a name="id-1.4.10.9.3.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PangoEngineShapeClass.script-shape"></a>script_shape</code></em> ()</p></td>
<td class="struct_member_description"><p>Given a font, a piece of text, and a <a class="link" href="pango-Text-Processing.html#PangoAnalysis" title="struct PangoAnalysis"><span class="type">PangoAnalysis</span></a>
structure, converts characters to glyphs and positions the
resulting glyphs. The results are stored in the <a class="link" href="pango-Glyph-Storage.html#PangoGlyphString"><span class="type">PangoGlyphString</span></a>
that is passed in. (The implementation should resize it
appropriately using <a class="link" href="pango-Glyph-Storage.html#pango-glyph-string-set-size" title="pango_glyph_string_set_size ()"><code class="function">pango_glyph_string_set_size()</code></a>). All fields
of the <em class="parameter"><code>log_clusters</code></em>
and <em class="parameter"><code>glyphs</code></em>
array must be filled in, with
the exception that Pango will automatically generate
<code class="literal">glyphs->glyphs[i].attr.is_cluster_start</code>
using the <em class="parameter"><code>log_clusters</code></em>
array. Each input character must occur in one
of the output logical clusters;
if no rendering is desired for a character, this may involve
inserting glyphs with the <a class="link" href="pango-Glyph-Storage.html#PangoGlyph" title="PangoGlyph"><span class="type">PangoGlyph</span></a> ID <a class="link" href="pango-Glyph-Storage.html#PANGO-GLYPH-EMPTY:CAPS" title="PANGO_GLYPH_EMPTY"><span class="type">PANGO_GLYPH_EMPTY</span></a>, which
is guaranteed never to render. If the shaping fails for any reason,
the shaper should return with an empty (zero-size) glyph string.
If the shaper has not set the size on the glyph string yet, simply
returning signals the failure too.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PangoEngineShapeClass.covers"></a>covers</code></em> ()</p></td>
<td class="struct_member_description"><p>Returns the characters that this engine can cover
with a given font for a given language. If not overridden, the default
implementation simply returns the coverage information for the
font itself unmodified.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="PANGO-ENGINE-TYPE-SHAPE:CAPS"></a><h3>PANGO_ENGINE_TYPE_SHAPE</h3>
<pre class="programlisting">#define PANGO_ENGINE_TYPE_SHAPE "PangoEngineShape"
</pre>
<p>A string constant defining the engine type for shaping engines.
These engines derive from <a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a>.</p>
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