[feature/avatars] Refactor avatars to use manager

Manager now stores singletons of each driver to speed loading.

PHPBB3-10018

phpBB/includes/avatar/driver.php

@@ -0,0 +1,89 @@
+<?php
+/**
+*
+* @package avatar
+* @copyright (c) 2005, 2009 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* Base class for avatar drivers
+* @package avatars
+*/
+abstract class phpbb_avatar_driver
+{
+	/**
+	* Current board configuration
+	* @type phpbb_config
+	*/
+	protected $config;
+	
+	/**
+	* Current $phpbb_root_path
+	* @type string
+	*/
+	protected $phpbb_root_path;
+	
+	/**
+	* Current $phpEx
+	* @type string
+	*/
+	protected $php_ext;
+	
+	/**
+	* This flag should be set to true if the avatar requires a nonstandard image
+	* tag, and will generate the html itself.
+	* @type boolean
+	*/
+	public $custom_html = false;
+
+	/**
+	* Construct an avatar object
+	*
+	* @param $user_row User data to base the avatar url/html on
+	*/
+	public function __construct(phpbb_config $config, $phpbb_root_path, $php_ext)
+	{
+		$this->config = $config;
+		$this->phpbb_root_path = $phpbb_root_path;
+		$this->php_ext = $php_ext;
+	}
+
+	/**
+	* Get the avatar url and dimensions
+	*
+	* @param $ignore_config Whether $user or global avatar visibility settings
+	*        should be ignored
+	* @return array Avatar data
+	*/
+	public function get_data($user_row, $ignore_config = false)
+	{
+		return array(
+			'src' => '',
+			'width' => 0,
+			'height' => 0,
+		);
+	}
+
+	/**
+	* Returns custom html for displaying this avatar.
+	* Only called if $custom_html is true.
+	*
+	* @param $ignore_config Whether $user or global avatar visibility settings
+	*        should be ignored
+	* @return string HTML
+	*/
+	public function get_custom_html($user_row, $ignore_config = false)
+	{
+		return '';
+	}
+}