Function xcb::ffi::xproto::xcb_change_gc_checked

pub unsafe extern "C" fn xcb_change_gc_checked(
    c: *mut xcb_connection_t, 
    gc: xcb_gcontext_t, 
    value_mask: u32, 
    value_list: *const u32
) -> xcb_void_cookie_t

change graphics context components

Changes the components specified by value_mask for the specified graphics context.