Synopsis

void                gimp_item_get_preview_size          (GimpViewable *viewable,
                                                         gint size,
                                                         gboolean is_popup,
                                                         gboolean dot_for_dot,
                                                         gint *width,
                                                         gint *height);
gboolean            gimp_item_get_popup_size            (GimpViewable *viewable,
                                                         gint width,
                                                         gint height,
                                                         gboolean dot_for_dot,
                                                         gint *popup_width,
                                                         gint *popup_height);