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<a name="gdk-pixbuf-Module-Interface"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gdk-pixbuf-Module-Interface.top_of_page"></a>Module Interface</span></h2>
<p>Module Interface — Extending GdkPixBuf</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.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 href="../glib/glib-Singly-Linked-Lists.html#GSList"><span class="returnvalue">GSList</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-get-formats" title="gdk_pixbuf_get_formats ()">gdk_pixbuf_get_formats</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="returnvalue">GdkPixbufFormat</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-copy" title="gdk_pixbuf_format_copy ()">gdk_pixbuf_format_copy</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="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-free" title="gdk_pixbuf_format_free ()">gdk_pixbuf_format_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-name" title="gdk_pixbuf_format_get_name ()">gdk_pixbuf_format_get_name</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-description" title="gdk_pixbuf_format_get_description ()">gdk_pixbuf_format_get_description</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-mime-types" title="gdk_pixbuf_format_get_mime_types ()">gdk_pixbuf_format_get_mime_types</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-extensions" title="gdk_pixbuf_format_get_extensions ()">gdk_pixbuf_format_get_extensions</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-is-save-option-supported" title="gdk_pixbuf_format_is_save_option_supported ()">gdk_pixbuf_format_is_save_option_supported</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-is-writable" title="gdk_pixbuf_format_is_writable ()">gdk_pixbuf_format_is_writable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-is-scalable" title="gdk_pixbuf_format_is_scalable ()">gdk_pixbuf_format_is_scalable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-is-disabled" title="gdk_pixbuf_format_is_disabled ()">gdk_pixbuf_format_is_disabled</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="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-set-disabled" title="gdk_pixbuf_format_set_disabled ()">gdk_pixbuf_format_set_disabled</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-license" title="gdk_pixbuf_format_get_license ()">gdk_pixbuf_format_get_license</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleFillVtableFunc" title="GdkPixbufModuleFillVtableFunc ()">*GdkPixbufModuleFillVtableFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleFillInfoFunc" title="GdkPixbufModuleFillInfoFunc ()">*GdkPixbufModuleFillInfoFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleSizeFunc" title="GdkPixbufModuleSizeFunc ()">*GdkPixbufModuleSizeFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModulePreparedFunc" title="GdkPixbufModulePreparedFunc ()">*GdkPixbufModulePreparedFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleUpdatedFunc" title="GdkPixbufModuleUpdatedFunc ()">*GdkPixbufModuleUpdatedFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.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">struct</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat">GdkPixbufFormat</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormatFlags" title="enum GdkPixbufFormatFlags">GdkPixbufFormatFlags</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModulePattern" title="struct GdkPixbufModulePattern">GdkPixbufModulePattern</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule">GdkPixbufModule</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufAnimationClass" title="struct GdkPixbufAnimationClass">GdkPixbufAnimationClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufAnimationIterClass" title="struct GdkPixbufAnimationIterClass">GdkPixbufAnimationIterClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gdk-pixbuf/gdk-pixbuf.h>
</pre>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.description"></a><h2>Description</h2>
<p>If GdkPixBuf has been compiled with GModule support, it can be extended by
modules which can load (and perhaps also save) new image and animation
formats. Each loadable module must export a
<a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleFillInfoFunc" title="GdkPixbufModuleFillInfoFunc ()"><span class="type">GdkPixbufModuleFillInfoFunc</span></a> function named <code class="literal">fill_info</code> and
a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleFillVtableFunc" title="GdkPixbufModuleFillVtableFunc ()"><span class="type">GdkPixbufModuleFillVtableFunc</span></a> function named
<code class="literal">fill_vtable</code>.</p>
<p>In order to make format-checking work before actually loading the modules
(which may require dlopening image libraries), modules export their
signatures (and other information) via the <code class="literal">fill_info</code> function. An
external utility, gdk-pixbuf-query-loaders, uses this to create a text
file containing a list of all available loaders and their signatures.
This file is then read at runtime by GdkPixBuf to obtain the list of
available loaders and their signatures. </p>
<p>Modules may only implement a subset of the functionality available via
<a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a>. If a particular functionality is not implemented, the
<code class="literal">fill_vtable</code> function will simply not set the corresponding
function pointers of the <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a> structure. If a module supports
incremental loading (i.e. provides <span class="type">begin_load</span>, <span class="type">stop_load</span> and
<span class="type">load_increment</span>), it doesn't have to implement <span class="type">load</span>, since GdkPixBuf can
supply a generic <span class="type">load</span> implementation wrapping the incremental loading. </p>
<p>Installing a module is a two-step process:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>copy the module file(s) to the loader directory (normally
<code class="literal">$libdir/gdk-pixbuf-2.0/$version/loaders</code>, unless overridden by the
environment variable <code class="literal">GDK_PIXBUF_MODULEDIR</code>) </p></li>
<li class="listitem"><p>call gdk-pixbuf-query-loaders to update the module file (normally
<code class="literal">$libdir/gdk-pixbuf-2.0/$version/loaders.cache</code>, unless overridden by the
environment variable <code class="literal">GDK_PIXBUF_MODULE_FILE</code>)</p></li>
</ul></div>
<p>The GdkPixBuf interfaces needed for implementing modules are contained in
<code class="literal">gdk-pixbuf-io.h</code> (and <code class="literal">gdk-pixbuf-animation.h</code> if the module supports
animations). They are not covered by the same stability guarantees as the
regular GdkPixBuf API. To underline this fact, they are protected by
<code class="literal">#ifdef GDK_PIXBUF_ENABLE_BACKEND</code>.</p>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gdk-pixbuf-get-formats"></a><h3>gdk_pixbuf_get_formats ()</h3>
<pre class="programlisting"><a href="../glib/glib-Singly-Linked-Lists.html#GSList"><span class="returnvalue">GSList</span></a> *
gdk_pixbuf_get_formats (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Obtains the available information about the image formats supported
by GdkPixbuf.</p>
<div class="refsect3">
<a name="gdk-pixbuf-get-formats.returns"></a><h4>Returns</h4>
<p> A list of
<a href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat"><span class="type">GdkPixbufFormats</span></a> describing the supported image formats. The list should
be freed when it is no longer needed, but the structures themselves are
owned by <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> and should not be freed. </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> GdkPixbufFormat]</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-pixbuf-format-copy"></a><h3>gdk_pixbuf_format_copy ()</h3>
<pre class="programlisting"><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="returnvalue">GdkPixbufFormat</span></a> *
gdk_pixbuf_format_copy (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Creates a copy of <em class="parameter"><code>format</code></em>
</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-copy.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-copy.returns"></a><h4>Returns</h4>
<p> the newly allocated copy of a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a>. Use
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-free" title="gdk_pixbuf_format_free ()"><code class="function">gdk_pixbuf_format_free()</code></a> to free the resources when done</p>
</div>
<p class="since">Since: 2.22</p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-free"></a><h3>gdk_pixbuf_format_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_pixbuf_format_free (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Frees the resources allocated when copying a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a>
using <a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-copy" title="gdk_pixbuf_format_copy ()"><code class="function">gdk_pixbuf_format_copy()</code></a></p>
<div class="refsect3">
<a name="gdk-pixbuf-format-free.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 2.22</p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-get-name"></a><h3>gdk_pixbuf_format_get_name ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gdk_pixbuf_format_get_name (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns the name of the format.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-name.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-name.returns"></a><h4>Returns</h4>
<p> the name of the format. </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-pixbuf-format-get-description"></a><h3>gdk_pixbuf_format_get_description ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gdk_pixbuf_format_get_description (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns a description of the format.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-description.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-description.returns"></a><h4>Returns</h4>
<p> a description of the format.</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-pixbuf-format-get-mime-types"></a><h3>gdk_pixbuf_format_get_mime_types ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
gdk_pixbuf_format_get_mime_types (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns the mime types supported by the format.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-mime-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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-mime-types.returns"></a><h4>Returns</h4>
<p> a <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of mime types which must be freed with
<a href="../glib/glib-String-Utility-Functions.html#g-strfreev"><code class="function">g_strfreev()</code></a> when it is no longer needed. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</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-pixbuf-format-get-extensions"></a><h3>gdk_pixbuf_format_get_extensions ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
gdk_pixbuf_format_get_extensions (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns the filename extensions typically used for files in the
given format.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-extensions.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-extensions.returns"></a><h4>Returns</h4>
<p> a <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of filename extensions which must be
freed with <a href="../glib/glib-String-Utility-Functions.html#g-strfreev"><code class="function">g_strfreev()</code></a> when it is no longer needed. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</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-pixbuf-format-is-save-option-supported"></a><h3>gdk_pixbuf_format_is_save_option_supported ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gdk_pixbuf_format_is_save_option_supported
(<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>,
<em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *option_key</code></em>);</pre>
<p>Returns <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the save option specified by <em class="parameter"><code>option_key</code></em>
is supported when
saving a pixbuf using the module implementing <em class="parameter"><code>format</code></em>
.
See <a class="link" href="gdk-pixbuf-File-saving.html#gdk-pixbuf-save" title="gdk_pixbuf_save ()"><code class="function">gdk_pixbuf_save()</code></a> for more information about option keys.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-save-option-supported.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>option_key</p></td>
<td class="parameter_description"><p>the name of an option</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-save-option-supported.returns"></a><h4>Returns</h4>
<p> <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the specified option is supported</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-is-writable"></a><h3>gdk_pixbuf_format_is_writable ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gdk_pixbuf_format_is_writable (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns whether pixbufs can be saved in the given format.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-writable.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-writable.returns"></a><h4>Returns</h4>
<p> whether pixbufs can be saved in the given format.</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-pixbuf-format-is-scalable"></a><h3>gdk_pixbuf_format_is_scalable ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gdk_pixbuf_format_is_scalable (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns whether this image format is scalable. If a file is in a
scalable format, it is preferable to load it at the desired size,
rather than loading it at the default size and scaling the
resulting pixbuf to the desired size.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-scalable.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-scalable.returns"></a><h4>Returns</h4>
<p> whether this image format is scalable.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6.html#api-index-2.6">2.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-is-disabled"></a><h3>gdk_pixbuf_format_is_disabled ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gdk_pixbuf_format_is_disabled (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns whether this image format is disabled. See
<a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-set-disabled" title="gdk_pixbuf_format_set_disabled ()"><code class="function">gdk_pixbuf_format_set_disabled()</code></a>.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-disabled.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-is-disabled.returns"></a><h4>Returns</h4>
<p> whether this image format is disabled.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6.html#api-index-2.6">2.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-set-disabled"></a><h3>gdk_pixbuf_format_set_disabled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gdk_pixbuf_format_set_disabled (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> disabled</code></em>);</pre>
<p>Disables or enables an image format. If a format is disabled,
gdk-pixbuf won't use the image loader for this format to load
images. Applications can use this to avoid using image loaders
with an inappropriate license, see <a class="link" href="gdk-pixbuf-Module-Interface.html#gdk-pixbuf-format-get-license" title="gdk_pixbuf_format_get_license ()"><code class="function">gdk_pixbuf_format_get_license()</code></a>.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-set-disabled.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>disabled</p></td>
<td class="parameter_description"><p><a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to disable the format <em class="parameter"><code>format</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6.html#api-index-2.6">2.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-format-get-license"></a><h3>gdk_pixbuf_format_get_license ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gdk_pixbuf_format_get_license (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *format</code></em>);</pre>
<p>Returns information about the license of the image loader for the format. The
returned string should be a shorthand for a wellknown license, e.g. "LGPL",
"GPL", "QPL", "GPL/QPL", or "other" to indicate some other license. This
string should be freed with <a href="../glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when it's no longer needed.</p>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-license.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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gdk-pixbuf-format-get-license.returns"></a><h4>Returns</h4>
<p> a string describing the license of <em class="parameter"><code>format</code></em>
. </p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6.html#api-index-2.6">2.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GdkPixbufModuleFillVtableFunc"></a><h3>GdkPixbufModuleFillVtableFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdkPixbufModuleFillVtableFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a> *module</code></em>);</pre>
<p>Defines the type of the function used to set the vtable of a
<a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a> when it is loaded.</p>
<div class="refsect3">
<a name="GdkPixbufModuleFillVtableFunc.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>module</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</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="GdkPixbufModuleFillInfoFunc"></a><h3>GdkPixbufModuleFillInfoFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdkPixbufModuleFillInfoFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *info</code></em>);</pre>
<p>Defines the type of the function used to fill a
<a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> structure with information about a module.</p>
<div class="refsect3">
<a name="GdkPixbufModuleFillInfoFunc.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>info</p></td>
<td class="parameter_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</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="GdkPixbufModuleSizeFunc"></a><h3>GdkPixbufModuleSizeFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdkPixbufModuleSizeFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *width</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *height</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Defines the type of the function that gets called once the size
of the loaded image is known.</p>
<p>The function is expected to set <em class="parameter"><code>width</code></em>
and <em class="parameter"><code>height</code></em>
to the desired
size to which the image should be scaled. If a module has no efficient
way to achieve the desired scaling during the loading of the image, it may
either ignore the size request, or only approximate it - gdk-pixbuf will
then perform the required scaling on the completely loaded image. </p>
<p>If the function sets <em class="parameter"><code>width</code></em>
or <em class="parameter"><code>height</code></em>
to zero, the module should interpret
this as a hint that it will be closed soon and shouldn't allocate further
resources. This convention is used to implement <a class="link" href="gdk-pixbuf-File-Loading.html#gdk-pixbuf-get-file-info" title="gdk_pixbuf_get_file_info ()"><code class="function">gdk_pixbuf_get_file_info()</code></a>
efficiently.</p>
<div class="refsect3">
<a name="GdkPixbufModuleSizeFunc.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>width</p></td>
<td class="parameter_description"><p>pointer to a location containing the current image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>pointer to a location containing the current image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the loader.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="GdkPixbufModulePreparedFunc"></a><h3>GdkPixbufModulePreparedFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdkPixbufModulePreparedFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>,
<em class="parameter"><code><a class="link" href="gdk-pixbuf-Animations.html#GdkPixbufAnimation"><span class="type">GdkPixbufAnimation</span></a> *anim</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Defines the type of the function that gets called once the initial
setup of <em class="parameter"><code>pixbuf</code></em>
is done.</p>
<p><a class="link" href="GdkPixbufLoader.html" title="GdkPixbufLoader"><span class="type">GdkPixbufLoader</span></a> uses a function of this type to emit the
"<link linkend="GdkPixbufLoader-area-prepared">area_prepared</link>"
signal.</p>
<div class="refsect3">
<a name="GdkPixbufModulePreparedFunc.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>pixbuf</p></td>
<td class="parameter_description"><p>the <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> that is currently being loaded.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>anim</p></td>
<td class="parameter_description"><p>if an animation is being loaded, the <a class="link" href="gdk-pixbuf-Animations.html#GdkPixbufAnimation"><span class="type">GdkPixbufAnimation</span></a>, else <a href="../glib/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>user_data</p></td>
<td class="parameter_description"><p>the loader.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="GdkPixbufModuleUpdatedFunc"></a><h3>GdkPixbufModuleUpdatedFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdkPixbufModuleUpdatedFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>,
<em class="parameter"><code><span class="type">int</span> x</code></em>,
<em class="parameter"><code><span class="type">int</span> y</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Defines the type of the function that gets called every time a region
of <em class="parameter"><code>pixbuf</code></em>
is updated.</p>
<p><a class="link" href="GdkPixbufLoader.html" title="GdkPixbufLoader"><span class="type">GdkPixbufLoader</span></a> uses a function of this type to emit the
"<link linkend="GdkPixbufLoader-area-updated">area_updated</link>"
signal.</p>
<div class="refsect3">
<a name="GdkPixbufModuleUpdatedFunc.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>pixbuf</p></td>
<td class="parameter_description"><p>the <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> that is currently being loaded.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>the X origin of the updated area.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>the Y origin of the updated area.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>the width of the updated area.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>the height of the updated area.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the loader.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-2.html#api-index-2.2">2.2</a></p>
</div>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Module-Interface.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GdkPixbufFormat"></a><h3>struct GdkPixbufFormat</h3>
<pre class="programlisting">struct GdkPixbufFormat {
gchar *name;
GdkPixbufModulePattern *signature;
gchar *domain;
gchar *description;
gchar **mime_types;
gchar **extensions;
guint32 flags;
gboolean disabled;
gchar *license;
};
</pre>
<p>A <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> contains information about the image format accepted by a
module. Only modules should access the fields directly, applications should
use the <function>gdk_pixbuf_format_*</function> functions.</p>
<div class="refsect3">
<a name="GdkPixbufFormat.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><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GdkPixbufFormat.name"></a>name</code></em>;</p></td>
<td class="struct_member_description"><p>the name of the image format.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModulePattern" title="struct GdkPixbufModulePattern"><span class="type">GdkPixbufModulePattern</span></a> *<em class="structfield"><code><a name="GdkPixbufFormat.signature"></a>signature</code></em>;</p></td>
<td class="struct_member_description"><p>the signature of the module.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GdkPixbufFormat.domain"></a>domain</code></em>;</p></td>
<td class="struct_member_description"><p>the message domain for the <em class="parameter"><code>description</code></em>
.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GdkPixbufFormat.description"></a>description</code></em>;</p></td>
<td class="struct_member_description"><p>a description of the image format.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **<em class="structfield"><code><a name="GdkPixbufFormat.mime-types"></a>mime_types</code></em>;</p></td>
<td class="struct_member_description"><p>a <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of MIME types for the image format.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **<em class="structfield"><code><a name="GdkPixbufFormat.extensions"></a>extensions</code></em>;</p></td>
<td class="struct_member_description"><p>a <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of typical filename extensions for the
image format.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GdkPixbufFormat.flags"></a>flags</code></em>;</p></td>
<td class="struct_member_description"><p>a combination of <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormatFlags" title="enum GdkPixbufFormatFlags"><span class="type">GdkPixbufFormatFlags</span></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GdkPixbufFormat.disabled"></a>disabled</code></em>;</p></td>
<td class="struct_member_description"><p>a boolean determining whether the loader is disabled.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GdkPixbufFormat.license"></a>license</code></em>;</p></td>
<td class="struct_member_description"><p>a string containing license information, typically set to
shorthands like "GPL", "LGPL", etc.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="GdkPixbufFormatFlags"></a><h3>enum GdkPixbufFormatFlags</h3>
<p>Flags which allow a module to specify further details about the supported
operations.</p>
<div class="refsect3">
<a name="GdkPixbufFormatFlags.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-PIXBUF-FORMAT-WRITABLE:CAPS"></a>GDK_PIXBUF_FORMAT_WRITABLE</p></td>
<td class="enum_member_description">
<p>the module can write out images in the format.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-PIXBUF-FORMAT-SCALABLE:CAPS"></a>GDK_PIXBUF_FORMAT_SCALABLE</p></td>
<td class="enum_member_description">
<p>the image format is scalable</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDK-PIXBUF-FORMAT-THREADSAFE:CAPS"></a>GDK_PIXBUF_FORMAT_THREADSAFE</p></td>
<td class="enum_member_description">
<p>the module is threadsafe. gdk-pixbuf
ignores modules that are not marked as threadsafe. (Since 2.28).</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="GdkPixbufModulePattern"></a><h3>struct GdkPixbufModulePattern</h3>
<pre class="programlisting">struct GdkPixbufModulePattern {
char *prefix;
char *mask;
int relevance;
};
</pre>
<p>The signature of a module is a set of prefixes. Prefixes are encoded as
pairs of ordinary strings, where the second string, called the mask, if
not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, must be of the same length as the first one and may contain
' ', '!', 'x', 'z', and 'n' to indicate bytes that must be matched,
not matched, "don't-care"-bytes, zeros and non-zeros.
Each prefix has an associated integer that describes the relevance of
the prefix, with 0 meaning a mismatch and 100 a "perfect match".</p>
<p>Starting with gdk-pixbuf 2.8, the first byte of the mask may be '*',
indicating an unanchored pattern that matches not only at the beginning,
but also in the middle. Versions prior to 2.8 will interpret the '*'
like an 'x'. </p>
<p>The signature of a module is stored as an array of
<a href="gdk-pixbuf-Module-Interface.html#GdkPixbufModulePattern"><span class="type">GdkPixbufModulePatterns</span></a>. The array is terminated by a pattern
where the <em class="parameter"><code>prefix</code></em>
is <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<p><informalexample><programlisting>
GdkPixbufModulePattern *signature[] = {
{ "abcdx", " !x z", 100 },
{ "bla", NULL, 90 },
{ NULL, NULL, 0 }
};
</programlisting>
The example matches e.g. "auud\0" with relevance 100, and "blau" with
relevance 90.</informalexample></p>
<div class="refsect3">
<a name="GdkPixbufModulePattern.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><span class="type">char</span> *<em class="structfield"><code><a name="GdkPixbufModulePattern.prefix"></a>prefix</code></em>;</p></td>
<td class="struct_member_description"><p>the prefix for this pattern</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">char</span> *<em class="structfield"><code><a name="GdkPixbufModulePattern.mask"></a>mask</code></em>;</p></td>
<td class="struct_member_description"><p>mask containing bytes which modify how the prefix is matched against
test data</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="GdkPixbufModulePattern.relevance"></a>relevance</code></em>;</p></td>
<td class="struct_member_description"><p>relevance of this pattern</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="GdkPixbufModule"></a><h3>struct GdkPixbufModule</h3>
<pre class="programlisting">struct GdkPixbufModule {
char *module_name;
char *module_path;
GModule *module;
GdkPixbufFormat *info;
GdkPixbuf *(* load) (FILE *f,
GError **error);
GdkPixbuf *(* load_xpm_data) (const char **data);
/* Incremental loading */
gpointer (* begin_load) (GdkPixbufModuleSizeFunc size_func,
GdkPixbufModulePreparedFunc prepare_func,
GdkPixbufModuleUpdatedFunc update_func,
gpointer user_data,
GError **error);
gboolean (* stop_load) (gpointer context,
GError **error);
gboolean (* load_increment) (gpointer context,
const guchar *buf,
guint size,
GError **error);
/* Animation loading */
GdkPixbufAnimation *(* load_animation) (FILE *f,
GError **error);
/* Saving */
gboolean (* save) (FILE *f,
GdkPixbuf *pixbuf,
gchar **param_keys,
gchar **param_values,
GError **error);
gboolean (*save_to_callback) (GdkPixbufSaveFunc save_func,
gpointer user_data,
GdkPixbuf *pixbuf,
gchar **option_keys,
gchar **option_values,
GError **error);
gboolean (* is_save_option_supported) (const gchar *option_key);
};
</pre>
<p>A <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a> contains the necessary functions to load and save
images in a certain file format. </p>
<p>A <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a> can be loaded dynamically from a <a href="../glib/glib-Dynamic-Loading-of-Modules.html#GModule"><span class="type">GModule</span></a>.
Each loadable module must contain a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModuleFillVtableFunc" title="GdkPixbufModuleFillVtableFunc ()"><span class="type">GdkPixbufModuleFillVtableFunc</span></a> function
named <function>fill_vtable</function>, which will get called when the module
is loaded and must set the function pointers of the <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufModule" title="struct GdkPixbufModule"><span class="type">GdkPixbufModule</span></a>.</p>
<div class="refsect3">
<a name="GdkPixbufModule.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><span class="type">char</span> *<em class="structfield"><code><a name="GdkPixbufModule.module-name"></a>module_name</code></em>;</p></td>
<td class="struct_member_description"><p>the name of the module, usually the same as the
usual file extension for images of this type, eg. "xpm", "jpeg" or "png".</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">char</span> *<em class="structfield"><code><a name="GdkPixbufModule.module-path"></a>module_path</code></em>;</p></td>
<td class="struct_member_description"><p>the path from which the module is loaded.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Dynamic-Loading-of-Modules.html#GModule"><span class="type">GModule</span></a> *<em class="structfield"><code><a name="GdkPixbufModule.module"></a>module</code></em>;</p></td>
<td class="struct_member_description"><p>the loaded <a href="../glib/glib-Dynamic-Loading-of-Modules.html#GModule"><span class="type">GModule</span></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> *<em class="structfield"><code><a name="GdkPixbufModule.info"></a>info</code></em>;</p></td>
<td class="struct_member_description"><p>a <a class="link" href="gdk-pixbuf-Module-Interface.html#GdkPixbufFormat" title="struct GdkPixbufFormat"><span class="type">GdkPixbufFormat</span></a> holding information about the module.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.load"></a>load</code></em> ()</p></td>
<td class="struct_member_description"><p>loads an image from a file.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.load-xpm-data"></a>load_xpm_data</code></em> ()</p></td>
<td class="struct_member_description"><p>loads an image from data in memory.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.begin-load"></a>begin_load</code></em> ()</p></td>
<td class="struct_member_description"><p>begins an incremental load.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.stop-load"></a>stop_load</code></em> ()</p></td>
<td class="struct_member_description"><p>stops an incremental load.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.load-increment"></a>load_increment</code></em> ()</p></td>
<td class="struct_member_description"><p>continues an incremental load.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.load-animation"></a>load_animation</code></em> ()</p></td>
<td class="struct_member_description"><p>loads an animation from a file.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.save"></a>save</code></em> ()</p></td>
<td class="struct_member_description"><p>saves a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> to a file.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.save-to-callback"></a>save_to_callback</code></em> ()</p></td>
<td class="struct_member_description"><p>saves a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> by calling the given <a class="link" href="gdk-pixbuf-File-saving.html#GdkPixbufSaveFunc" title="GdkPixbufSaveFunc ()"><span class="type">GdkPixbufSaveFunc</span></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufModule.is-save-option-supported"></a>is_save_option_supported</code></em> ()</p></td>
<td class="struct_member_description"><p>returns whether a save option key is supported by the module</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GdkPixbufAnimationClass"></a><h3>struct GdkPixbufAnimationClass</h3>
<pre class="programlisting">struct GdkPixbufAnimationClass {
GObjectClass parent_class;
gboolean (*is_static_image) (GdkPixbufAnimation *anim);
GdkPixbuf* (*get_static_image) (GdkPixbufAnimation *anim);
void (*get_size) (GdkPixbufAnimation *anim,
int *width,
int *height);
GdkPixbufAnimationIter* (*get_iter) (GdkPixbufAnimation *anim,
const GTimeVal *start_time);
};
</pre>
<p>Modules supporting animations must derive a type from
<a class="link" href="gdk-pixbuf-Animations.html#GdkPixbufAnimation"><span class="type">GdkPixbufAnimation</span></a>, providing suitable implementations of the
virtual functions.</p>
<div class="refsect3">
<a name="GdkPixbufAnimationClass.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="GdkPixbufAnimationClass.is-static-image"></a>is_static_image</code></em> ()</p></td>
<td class="struct_member_description"><p>returns whether the given animation is just a static image.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationClass.get-static-image"></a>get_static_image</code></em> ()</p></td>
<td class="struct_member_description"><p>returns a static image representing the given animation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationClass.get-size"></a>get_size</code></em> ()</p></td>
<td class="struct_member_description"><p>fills <em class="parameter"><code>width</code></em>
and <em class="parameter"><code>height</code></em>
with the frame size of the animation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationClass.get-iter"></a>get_iter</code></em> ()</p></td>
<td class="struct_member_description"><p>returns an iterator for the given animation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GdkPixbufAnimationIterClass"></a><h3>struct GdkPixbufAnimationIterClass</h3>
<pre class="programlisting">struct GdkPixbufAnimationIterClass {
GObjectClass parent_class;
int (*get_delay_time) (GdkPixbufAnimationIter *iter);
GdkPixbuf* (*get_pixbuf) (GdkPixbufAnimationIter *iter);
gboolean (*on_currently_loading_frame) (GdkPixbufAnimationIter *iter);
gboolean (*advance) (GdkPixbufAnimationIter *iter,
const GTimeVal *current_time);
};
</pre>
<p>Modules supporting animations must derive a type from
<a class="link" href="gdk-pixbuf-Animations.html#GdkPixbufAnimationIter"><span class="type">GdkPixbufAnimationIter</span></a>, providing suitable implementations of the
virtual functions.</p>
<div class="refsect3">
<a name="GdkPixbufAnimationIterClass.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="GdkPixbufAnimationIterClass.get-delay-time"></a>get_delay_time</code></em> ()</p></td>
<td class="struct_member_description"><p>returns the time in milliseconds that the current frame
should be shown.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationIterClass.get-pixbuf"></a>get_pixbuf</code></em> ()</p></td>
<td class="struct_member_description"><p>returns the current frame.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationIterClass.on-currently-loading-frame"></a>on_currently_loading_frame</code></em> ()</p></td>
<td class="struct_member_description"><p>returns whether the current frame of <em class="parameter"><code>iter</code></em>
is
being loaded.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GdkPixbufAnimationIterClass.advance"></a>advance</code></em> ()</p></td>
<td class="struct_member_description"><p>advances the iterator to <em class="parameter"><code>current_time</code></em>
, possibly changing the
current frame.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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