Get terms by taxonomy AND post_type

I have 2 custom post types ‘bookmarks’ and ‘snippets’ and a shared taxonomy ‘tag’. I can generate a list of all terms in the taxonomy with get_terms(), but I can’t figure out how to limit the list to the post type. What I’m basically looking for is something like this:

get_terms(array('taxonomy' => 'tag', 'post_type' => 'snippet'));

Is there a way to achieve this? Ideas are greatly appreciated!!

Oh, I’m on WP 3.1.1


Here is another way to do something similar, with one SQL query:

static public function get_terms_by_post_type( $taxonomies, $post_types ) {

    global $wpdb;

    $query = $wpdb->prepare(
        "SELECT t.*, COUNT(*) from $wpdb->terms AS t
        INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id
        INNER JOIN $wpdb->term_relationships AS r ON r.term_taxonomy_id = tt.term_taxonomy_id
        INNER JOIN $wpdb->posts AS p ON p.ID = r.object_id
        WHERE p.post_type IN('%s') AND tt.taxonomy IN('%s')
        GROUP BY t.term_id",
        join( "', '", $post_types ),
        join( "', '", $taxonomies )

    $results = $wpdb->get_results( $query );

    return $results;


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