Function gtk_snapshot_push_component_transfer 

pub unsafe extern "C" fn gtk_snapshot_push_component_transfer(
    snapshot: *mut GtkSnapshot,
    red: *const GskComponentTransfer,
    green: *const GskComponentTransfer,
    blue: *const GskComponentTransfer,
    alpha: *const GskComponentTransfer,
)

Available on crate feature v4_20 only.