CMedialibItem::GenerateThumbnail

static function GenerateThumbnail(&$arFile, $Params = array())
{
	$rootPath = isset($Params['rootPath']) ? $Params['rootPath'] : CSite::GetSiteDocRoot(false);
	if (CFile::IsImage($arFile['FILE_NAME']))
	{
		$arResized = CFile::ResizeImageGet($arFile, array('width' => $Params['width'], 'height' => $Params['height']));
		if($arResized)
			$arFile['THUMB_PATH'] = $arResized['src'];
		$arFile['TYPE'] = 'image';
	}
	else
		$arFile['TYPE'] = 'file';
}