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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>PangoEngineShape: Pango Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="Pango Reference Manual"> <link rel="up" href="deprecated.html" title="Deprecated APIs"> <link rel="prev" href="PangoEngineLang.html" title="PangoEngineLang"> <link rel="next" href="pango-Modules.html" title="Modules"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#PangoEngineShape.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#PangoEngineShape.object-hierarchy" class="shortcut">Object Hierarchy</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="deprecated.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="PangoEngineLang.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="pango-Modules.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <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 class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_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 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="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="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">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> <div class="warning"><p><code class="literal">PANGO_ENGINE_SHAPE_DEFINE_TYPE</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div> <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="n">PangoEngine</span> <span class="o">*</span><span class="n">engine</span> <span class="o">=</span> <span class="n">g_object_new</span> <span class="p">(</span><span class="o"><</span><span class="n">em</span> <span class="n">class</span><span class="o">=</span><span class="s">"replaceable"</span><span class="o">><</span><span class="n">code</span><span class="o">></span><span class="n">prefix</span><span class="o"></</span><span class="n">code</span><span class="o">></</span><span class="n">em</span><span class="o">></span><span class="n">_type</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span></pre></td> </tr> </tbody> </table> </div> <div class="refsect3"> <a name="PANGO-ENGINE-SHAPE-DEFINE-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>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="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<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></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="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<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></td> </tr> </tbody> </table></div> </div> </div> </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> <div class="warning"><p><code class="literal">PangoEngineShape</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div> <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> <div class="warning"><p><code class="literal">PangoEngineShapeClass</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div> <p>Class structure for <a class="link" href="PangoEngineShape.html" title="PangoEngineShape"><span class="type">PangoEngineShape</span></a></p> <div class="refsect3"> <a name="PangoEngineShapeClass.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" 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> <div class="warning"><p><code class="literal">PANGO_ENGINE_TYPE_SHAPE</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div> <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> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>