/**
* Loads derivative configuration from database or initializes it.
*/
static function load_from_db()
{
global $conf;
$arr = @unserialize($conf['derivatives']);
if (false !== $arr) {
self::$type_map = $arr['d'];
self::$watermark = @$arr['w'];
if (!self::$watermark) {
self::$watermark = new WatermarkParams();
}
self::$custom = @$arr['c'];
if (!self::$custom) {
self::$custom = array();
}
if (isset($arr['q'])) {
self::$quality = $arr['q'];
}
} else {
self::$watermark = new WatermarkParams();
self::$type_map = self::get_default_sizes();
self::save();
}
self::build_maps();
}
