You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: format.rs
    path of file: ./repos/smithay/src/backend/allocator/vulkan
    
    the code of the file until where you have to start completion: //! Format conversions between Vulkan and DRM formats.

/// Macro to generate format conversions between Vulkan and FourCC format codes.
///
/// Any entry in this table may have attributes associated with a conversion. This is needed for `PACK` Vulkan
/// formats which may only have an alternative given a specific host endian.
///
/// See t
    
        pub const fn get_vk_format(fourcc: $crate::backend::allocator::Fourcc) -> Option<ash::vk::Format> {
            // FIXME: Use reexport for ash::vk::Format
            match fourcc {
                $(
                    $(#[$conv_meta])*
                    $crate::backend::allocator::Fourcc::$fourcc => Some(ash::vk::Format::$vk),
                )*

                _ => None,
            }
        }