GimpScaleCallback ()

void                (*GimpScaleCallback)                (GtkWidget *dialog,
                                                         GimpViewable *viewable,
                                                         gint width,
                                                         gint height,
                                                         GimpUnit unit,
                                                         GimpInterpolationType interpolation,
                                                         gdouble xresolution,
                                                         gdouble yresolution,
                                                         GimpUnit resolution_unit,
                                                         gpointer user_data);