_imagecache_get_presets() equivelent for 2.1?

Can anyone tell me what is the equivalent for this function in Imagecache2?

function citris_views_handler_filter_image_size($op) {
foreach( _imagecache_get_presets() as $key => $label ) {
$presets[$label] = $label;
}
return $presets;
}