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Miscellaneous Thumbnail Functions

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<!-- ##### FUNCTION gnome_desktop_thumbnail_has_uri ##### -->
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@pixbuf: 
@uri: 
@Returns: 


<!-- ##### FUNCTION gnome_desktop_thumbnail_is_valid ##### -->
<para>

</para>

@pixbuf: 
@uri: 
@mtime: 
@Returns: 


<!-- ##### FUNCTION gnome_desktop_thumbnail_md5 ##### -->
<para>

</para>

@uri: 
@Returns: 


<!-- ##### FUNCTION gnome_desktop_thumbnail_path_for_uri ##### -->
<para>

</para>

@uri: 
@size: 
@Returns: 


<!-- ##### FUNCTION gnome_desktop_thumbnail_scale_down_pixbuf ##### -->
<para>

</para>

@pixbuf: 
@dest_width: 
@dest_height: 
@Returns: 


