Function lv_image_decoder_set_close_cb 

pub unsafe extern "C" fn lv_image_decoder_set_close_cb(
    decoder: *mut lv_image_decoder_t,
    close_cb: lv_image_decoder_close_f_t,
)

Set a callback to close a decoding session. E.g. close files and free other resources. @param decoder pointer to an image decoder @param close_cb a function to close a decoding session