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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>FmThumbnailLoader: Libfm Reference Manual</title>
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<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="#libfm-FmThumbnailLoader.description" class="shortcut">Description</a></span>
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</tr></table>
<div class="refentry">
<a name="libfm-FmThumbnailLoader"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libfm-FmThumbnailLoader.top_of_page"></a>FmThumbnailLoader</span></h2>
<p>FmThumbnailLoader — A thumbnails cache loader and generator.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libfm-FmThumbnailLoader.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">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoaderCallback" title="FmThumbnailLoaderCallback ()">*FmThumbnailLoaderCallback</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">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-cancel" title="fm_thumbnail_loader_cancel ()">fm_thumbnail_loader_cancel</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct"><span class="returnvalue">GObject</span></a> *
</td>
<td class="function_name">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-get-data" title="fm_thumbnail_loader_get_data ()">fm_thumbnail_loader_get_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libfm-FmFileInfo.html#FmFileInfo" title="FmFileInfo"><span class="returnvalue">FmFileInfo</span></a> *
</td>
<td class="function_name">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-get-file-info" title="fm_thumbnail_loader_get_file_info ()">fm_thumbnail_loader_get_file_info</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-get-size" title="fm_thumbnail_loader_get_size ()">fm_thumbnail_loader_get_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="returnvalue">FmThumbnailLoader</span></a> *
</td>
<td class="function_name">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-load" title="fm_thumbnail_loader_load ()">fm_thumbnail_loader_load</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libfm-FmThumbnailLoader.html#fm-thumbnail-loader-set-backend" title="fm_thumbnail_loader_set_backend ()">fm_thumbnail_loader_set_backend</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libfm-FmThumbnailLoader.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"> </td>
<td class="function_name"><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader">FmThumbnailLoader</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoaderBackend" title="struct FmThumbnailLoaderBackend">FmThumbnailLoaderBackend</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libfm-FmThumbnailLoader.description"></a><h2>Description</h2>
<p><em class="parameter"><code>include</code></em>
: libfm/fm.h</p>
<p>This API allows to generate thumbnails for files and save them on
disk then use that cache next time to display them.</p>
</div>
<div class="refsect1">
<a name="libfm-FmThumbnailLoader.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="FmThumbnailLoaderCallback"></a><h3>FmThumbnailLoaderCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*FmThumbnailLoaderCallback<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="type">FmThumbnailLoader</span></a> *req</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>The callback to requestor when thumbnail is ready.
Note that this call is done outside of GTK loop so if the callback
wants to use any GTK API it should call <a href="/usr/share/gtk-doc/html/gdk3/gdk3-Threads.html#gdk-threads-enter"><code class="function">gdk_threads_enter()</code></a> and
<a href="/usr/share/gtk-doc/html/gdk3/gdk3-Threads.html#gdk-threads-leave"><code class="function">gdk_threads_leave()</code></a> for safety.</p>
<div class="refsect3">
<a name="FmThumbnailLoaderCallback.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>req</p></td>
<td class="parameter_description"><p>request descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>user data provided when request was made</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-cancel"></a><h3>fm_thumbnail_loader_cancel ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
fm_thumbnail_loader_cancel (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="type">FmThumbnailLoader</span></a> *req</code></em>);</pre>
<p>Cancels request. After return from this call the <em class="parameter"><code>req</code></em>
 becomes invalid
and cannot be used. Caller will never get callback for cancelled
request either.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-cancel.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>req</p></td>
<td class="parameter_description"><p>the request descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-get-data"></a><h3>fm_thumbnail_loader_get_data ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct"><span class="returnvalue">GObject</span></a> *
fm_thumbnail_loader_get_data (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="type">FmThumbnailLoader</span></a> *req</code></em>);</pre>
<p>Retrieves loaded thumbnail. Returned data are owned by <em class="parameter"><code>req</code></em>
 and should
be not freed by caller.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-data.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>req</p></td>
<td class="parameter_description"><p>request descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-data.returns"></a><h4>Returns</h4>
<p> thumbnail. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-get-file-info"></a><h3>fm_thumbnail_loader_get_file_info ()</h3>
<pre class="programlisting"><a class="link" href="libfm-FmFileInfo.html#FmFileInfo" title="FmFileInfo"><span class="returnvalue">FmFileInfo</span></a> *
fm_thumbnail_loader_get_file_info (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="type">FmThumbnailLoader</span></a> *req</code></em>);</pre>
<p>Retrieves file descriptor that request is for. Returned data are
owned by <em class="parameter"><code>req</code></em>
 and should be not freed by caller.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-file-info.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>req</p></td>
<td class="parameter_description"><p>request descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-file-info.returns"></a><h4>Returns</h4>
<p> file descriptor. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-get-size"></a><h3>fm_thumbnail_loader_get_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
fm_thumbnail_loader_get_size (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="type">FmThumbnailLoader</span></a> *req</code></em>);</pre>
<p>Retrieves thumbnail size that request is for.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-size.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>req</p></td>
<td class="parameter_description"><p>request descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="fm-thumbnail-loader-get-size.returns"></a><h4>Returns</h4>
<p> size in pixels.</p>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-load"></a><h3>fm_thumbnail_loader_load ()</h3>
<pre class="programlisting"><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoader" title="FmThumbnailLoader"><span class="returnvalue">FmThumbnailLoader</span></a> *
fm_thumbnail_loader_load (<em class="parameter"><code><a class="link" href="libfm-FmFileInfo.html#FmFileInfo" title="FmFileInfo"><span class="type">FmFileInfo</span></a> *src_file</code></em>,
                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>,
                          <em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoaderCallback" title="FmThumbnailLoaderCallback ()"><span class="type">FmThumbnailLoaderCallback</span></a> callback</code></em>,
                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Schedules loading/generation of thumbnail for <em class="parameter"><code>src_file</code></em>
. If the
request isn't cancelled then ready thumbnail will be given to the
requestor in <em class="parameter"><code>callback</code></em>
. Returned descriptor can be used to cancel
the job.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-load.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>src_file</p></td>
<td class="parameter_description"><p>an image file</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>thumbnail size</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>callback to requestor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>data provided for <em class="parameter"><code>callback</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="fm-thumbnail-loader-load.returns"></a><h4>Returns</h4>
<p> request descriptor. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-thumbnail-loader-set-backend"></a><h3>fm_thumbnail_loader_set_backend ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
fm_thumbnail_loader_set_backend (<em class="parameter"><code><a class="link" href="libfm-FmThumbnailLoader.html#FmThumbnailLoaderBackend" title="struct FmThumbnailLoaderBackend"><span class="type">FmThumbnailLoaderBackend</span></a> *_backend</code></em>);</pre>
<p>Sets callbacks list for further usage by thumbnail loader. Callbacks
should implement operations with image representation for application
specific model. This function can be called only once per application
and every subsequent call will return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> and change nothing.</p>
<div class="refsect3">
<a name="fm-thumbnail-loader-set-backend.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>_backend</p></td>
<td class="parameter_description"><p>callbacks list to set</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="fm-thumbnail-loader-set-backend.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> in case of success.</p>
</div>
<p class="since">Since: 1.2.0</p>
</div>
</div>
<div class="refsect1">
<a name="libfm-FmThumbnailLoader.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="FmThumbnailLoader"></a><h3>FmThumbnailLoader</h3>
<pre class="programlisting">typedef struct _FmThumbnailLoader FmThumbnailLoader;</pre>
</div>
<hr>
<div class="refsect2">
<a name="FmThumbnailLoaderBackend"></a><h3>struct FmThumbnailLoaderBackend</h3>
<pre class="programlisting">struct FmThumbnailLoaderBackend {
    GObject* (*read_image_from_file)(const char* filename);
    GObject* (*read_image_from_stream)(GInputStream* stream, guint64 len, GCancellable* cancellable);
    gboolean (*write_image)(GObject* image, const char* filename);
    GObject* (*scale_image)(GObject* ori_pix, int new_width, int new_height);
    GObject* (*rotate_image)(GObject* image, int degree);
    int (*get_image_width)(GObject* image);
    int (*get_image_height)(GObject* image);
    char* (*get_image_text)(GObject* image, const char* key);
    gboolean (*set_image_text)(GObject* image, const char* key, const char* val);
    // const char* (*get_image_orientation)(GObject* image);
    // GObject* (*apply_orientation)(GObject* image);
};
</pre>
<p>Abstract backend callbacks list.</p>
<div class="refsect3">
<a name="FmThumbnailLoaderBackend.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="FmThumbnailLoaderBackend.read-image-from-file"></a>read_image_from_file</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to read image by file path</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.read-image-from-stream"></a>read_image_from_stream</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to read image by opened <a href="/usr/share/gtk-doc/html/gio/GInputStream.html#GInputStream-struct"><span class="type">GInputStream</span></a></p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.write-image"></a>write_image</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to write thumbnail file from image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.scale-image"></a>scale_image</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to change image sizes</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.rotate-image"></a>rotate_image</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to change image orientation</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.get-image-width"></a>get_image_width</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to retrieve width from image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.get-image-height"></a>get_image_height</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to retrieve height from image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.get-image-text"></a>get_image_text</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to retrieve custom attributes text from image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="FmThumbnailLoaderBackend.set-image-text"></a>set_image_text</code></em> ()</p></td>
<td class="struct_member_description"><p>callback to set custom attributes text into image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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