Update bitflags dependency to v2

Co-authored-by: Marcin Radomski <[email protected]>

Cargo.toml

@@ -13,7 +13,7 @@ edition = "2021"
 
 [dependencies]
 libc = "0.2"
-bitflags = "1.2"
+bitflags = "2"
 drm-fourcc = "2.2"
 
 [dependencies.gbm-sys]
@@ -33,6 +33,14 @@ version = "0.3"
 features = ["server_system"]
 optional = true
 
+[dependencies.serde]
+# Minimal serde version that can compile serde-annotated bitflags v2.
+# Workaround that allows -Z minimal-versions build to succeed despite bitflags
+# crate not declaring minimum versions of its dependencies precisely enough.
+version = "1.0.103"
+features = ["derive"]
+optional = true
+
 [dev-dependencies.drm]
 version = "0.11.0"
 
@@ -42,6 +50,7 @@ import-wayland = ["wayland-server", "wayland-backend"]
 import-egl = []
 drm-support = ["drm"]
 use_bindgen = ["gbm-sys/use_bindgen"]
+serde = ["dep:serde", "bitflags/serde"]
 
 [workspace]
 members = [

src/buffer_object.rs

@@ -40,6 +40,8 @@ bitflags! {
     ///
     /// Use [`Device::is_format_supported()`] to check if the combination of format
     /// and use flags are supported
+    #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize), serde(transparent))]
+    #[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug)]
     pub struct BufferObjectFlags: u32 {
         /// Buffer is going to be presented to the screen using an API such as KMS
         const SCANOUT      = ffi::gbm_bo_flags::GBM_BO_USE_SCANOUT as u32;