pub unsafe extern "C" fn heif_context_get_primary_image_handle(
ctx: *mut heif_context,
arg1: *mut *mut heif_image_handle
) -> heif_errorpub unsafe extern "C" fn heif_context_get_primary_image_handle(
ctx: *mut heif_context,
arg1: *mut *mut heif_image_handle
) -> heif_error