Fix various codebase rots (stale CI, new Rust lints, broken MSRV checks by transitive dependency upgrades) (#164)

* game_activity/ffi: Drop cfg for inexistant `target_arch = "armv7"`

[Rust 1.80 from July 25th 2024] points out that `armv7` is not a known,
valid value for the `target_arch` cfg variable.  This is confirmed by
the docs not listing it either:
https://doc.rust-lang.org/reference/conditional-compilation.html#target_arch

Hence drop this entirely, and rely purely on `target_arch = "arm"`.

[Rust 1.80 from July 25th 2024]: https://blog.rust-lang.org/2024/07/25/Rust-1.80.0.html

* Fix `unexpected-cfgs` by adding `api-level-30` feature and removing `test`

Some code copied from the NDK carried over the respective `feature`
`cfg` guards, without ever adding the feature to the `[features]` list
in `Cargo.toml`.  Now that Rust detects these mishaps, we can fix it
by removing `test` (bindings don't seem to be run-tested) and reexpose
`ConfigurationRef::screen_round()` which was behind a previously
unsettable `feature = "api-level-30"`.

Also remove `unsafe impl Send/Sync for ConfigurationRef` since the
upstream `ndk` already declares `Configuration` to be `Send` and `Sync`,
and `RwLock` and `Arc` carry that through.

* native_activity: Fix clippy lints around `NativeActivityGlue` not `SendSync` and unwritten `redraw_needed` field

* CI: Remove deprecated/unmaintained `actions-rs` toolchain setup

The `actions-rs` containers haven't been maintained and updated for
years and don't need to: GitHub's actions environment already comes
fully loaded with a complete `stable` Rust installation with the
standard tools (in this case `rustfmt`).  Remove the remaining toolchain
setup (which was already replaced with `hecrj/setup-rust-action`
elsewhere) to get rid of ancient Node 12 deprecation warnings.

* Bump dependency patch-versions to fix `-Zminimal-versions` and MSRV check

Use `-Zminimal-versions` in our MSRV check.  This not only ensures
our minimum version bounds are actually solid and tested (even if
they may be a bit conservative at times, i.e. we could allow older
versions except for the crates that are bumped in this patch which were
explicitly build-tested), it also allows us to use this as a base for
the MSRV test, and preempt us from failing it whenever a (transitive!)
dependency bumps its MSRV beyond ours in a *semver-compatible* release.

* Elide redundant `impl` block lifetimes following stricter Rust 1.83 lint

Rust now points out that `impl<'a> (Trait for) Struct<'a>` is
superfluous whenever `'a` is not used anywhere else in the `impl` block.

.github/workflows/ci.yml

@@ -21,6 +21,20 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      # Downgrade all dependencies to their minimum version, both to ensure our
+      # minimum version bounds are correct and buildable, as well as to satisfy
+      # our MSRV check when arbitrary dependencies bump their MSRV beyond our
+      # MSRV in a patch-release.
+      # This implies that downstream consumers can only rely on our MSRV when
+      # downgrading various (transitive) dependencies.
+      - uses: hecrj/setup-rust-action@v2
+        with:
+          rust-version: nightly
+        if: ${{ matrix.rust-version != 'stable' }}
+      - name: Downgrade dependencies
+        run: cargo +nightly generate-lockfile -Zminimal-versions
+        if: ${{ matrix.rust-version != 'stable' }}
+
       - uses: hecrj/setup-rust-action@v2
         with:
           rust-version: ${{ matrix.rust-version }}
@@ -87,13 +101,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: rustfmt
-
       - name: Format
         run: cargo fmt --all -- --check
         working-directory: android-activity

android-activity/Cargo.toml

@@ -27,6 +27,7 @@ rust-version = "1.69.0"
 default = []
 game-activity = []
 native-activity = []
+api-level-30 = ["ndk/api-level-30"]
 
 [dependencies]
 log = "0.4"
@@ -35,15 +36,15 @@ cesu8 = "1"
 jni = "0.21"
 ndk-sys = "0.6.0"
 ndk = { version = "0.9.0", default-features = false }
-ndk-context = "0.1"
+ndk-context = "0.1.1"
 android-properties = "0.2"
 num_enum = "0.7"
 bitflags = "2.0"
-libc = "0.2"
+libc = "0.2.139"
 thiserror = "1"
 
 [build-dependencies]
-cc = { version = "1.0", features = ["parallel"] }
+cc = { version = "1.0.42", features = ["parallel"] }
 
 [package.metadata.docs.rs]
 targets = [

android-activity/src/config.rs

@@ -6,13 +6,14 @@ use ndk::configuration::{
     ScreenSize, Touchscreen, UiModeNight, UiModeType,
 };
 
-/// A (cheaply clonable) reference to this application's [`ndk::configuration::Configuration`]
+/// A runtime-replacable reference to [`ndk::configuration::Configuration`].
 ///
-/// This provides a thread-safe way to access the latest configuration state for
-/// an application without deeply copying the large [`ndk::configuration::Configuration`] struct.
+/// # Warning
 ///
-/// If the application is notified of configuration changes then those changes
-/// will become visible via pre-existing configuration references.
+/// The value held by this reference **will change** with every [`super::MainEvent::ConfigChanged`]
+/// event that is raised.  You should **not** [`Clone`] this type to compare it against a
+/// "new" [`super::AndroidApp::config()`] when that event is raised, since both point to the same
+/// internal [`ndk::configuration::Configuration`] and will be identical.
 #[derive(Clone)]
 pub struct ConfigurationRef {
     config: Arc<RwLock<Configuration>>,
@@ -28,8 +29,6 @@ impl PartialEq for ConfigurationRef {
     }
 }
 impl Eq for ConfigurationRef {}
-unsafe impl Send for ConfigurationRef {}
-unsafe impl Sync for ConfigurationRef {}
 
 impl fmt::Debug for ConfigurationRef {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

android-activity/src/game_activity/ffi.rs

@@ -16,17 +16,14 @@ use jni_sys::*;
 use libc::{pthread_cond_t, pthread_mutex_t, pthread_t};
 use ndk_sys::{AAssetManager, AConfiguration, ALooper, ALooper_callbackFunc, ANativeWindow, ARect};
 
-#[cfg(all(
-    any(target_os = "android", feature = "test"),
-    any(target_arch = "arm", target_arch = "armv7")
-))]
+#[cfg(all(any(target_os = "android"), target_arch = "arm"))]
 include!("ffi_arm.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "aarch64"))]
+#[cfg(all(any(target_os = "android"), target_arch = "aarch64"))]
 include!("ffi_aarch64.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "x86"))]
+#[cfg(all(any(target_os = "android"), target_arch = "x86"))]
 include!("ffi_i686.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "x86_64"))]
+#[cfg(all(any(target_os = "android"), target_arch = "x86_64"))]
 include!("ffi_x86_64.rs");

android-activity/src/game_activity/input.rs

@@ -263,7 +263,7 @@ pub(crate) struct PointerImpl<'a> {
     index: usize,
 }
 
-impl<'a> PointerImpl<'a> {
+impl PointerImpl<'_> {
     #[inline]
     pub fn pointer_index(&self) -> usize {
         self.index
@@ -333,7 +333,7 @@ impl<'a> Iterator for PointersIterImpl<'a> {
     }
 }
 
-impl<'a> ExactSizeIterator for PointersIterImpl<'a> {
+impl ExactSizeIterator for PointersIterImpl<'_> {
     fn len(&self) -> usize {
         self.count - self.next_index
     }
@@ -740,7 +740,7 @@ impl<'a> KeyEvent<'a> {
     }
 }
 
-impl<'a> KeyEvent<'a> {
+impl KeyEvent<'_> {
     /// Flags associated with this [`KeyEvent`].
     ///
     /// See [the NDK docs](https://developer.android.com/ndk/reference/group/input#akeyevent_getflags)

android-activity/src/game_activity/mod.rs

@@ -84,7 +84,7 @@ impl<'a> StateSaver<'a> {
 pub struct StateLoader<'a> {
     app: &'a AndroidAppInner,
 }
-impl<'a> StateLoader<'a> {
+impl StateLoader<'_> {
     pub fn load(&self) -> Option<Vec<u8>> {
         unsafe {
             let app_ptr = self.app.native_app.as_ptr();
@@ -722,7 +722,7 @@ impl<'a> InputBuffer<'a> {
     }
 }
 
-impl<'a> Drop for InputBuffer<'a> {
+impl Drop for InputBuffer<'_> {
     fn drop(&mut self) {
         unsafe {
             ffi::android_app_clear_motion_events(self.ptr.as_ptr());
@@ -801,7 +801,7 @@ pub(crate) struct InputIteratorInner<'a> {
     text_event_checked: bool,
 }
 
-impl<'a> InputIteratorInner<'a> {
+impl InputIteratorInner<'_> {
     pub(crate) fn next<F>(&mut self, callback: F) -> bool
     where
         F: FnOnce(&input::InputEvent) -> InputStatus,
@@ -943,7 +943,7 @@ pub unsafe extern "C" fn _rust_glue_entry(native_app: *mut ffi::android_app) {
                 // code to look up non-standard Java classes.
                 android_main(app);
             })
-            .unwrap_or_else(|panic| log_panic(panic));
+            .unwrap_or_else(log_panic);
 
             // Let JVM know that our Activity can be destroyed before detaching from the JVM
             //

android-activity/src/input.rs

@@ -912,7 +912,7 @@ pub struct InputIterator<'a> {
     pub(crate) inner: crate::activity_impl::InputIteratorInner<'a>,
 }
 
-impl<'a> InputIterator<'a> {
+impl InputIterator<'_> {
     /// Reads and handles the next input event by passing it to the given `callback`
     ///
     /// `callback` should return [`InputStatus::Unhandled`] for any input events that aren't directly
@@ -932,7 +932,7 @@ pub struct Pointer<'a> {
     pub(crate) inner: PointerImpl<'a>,
 }
 
-impl<'a> Pointer<'a> {
+impl Pointer<'_> {
     #[inline]
     pub fn pointer_index(&self) -> usize {
         self.inner.pointer_index()
@@ -1026,7 +1026,7 @@ impl<'a> Iterator for PointersIter<'a> {
     }
 }
 
-impl<'a> ExactSizeIterator for PointersIter<'a> {
+impl ExactSizeIterator for PointersIter<'_> {
     fn len(&self) -> usize {
         self.inner.len()
     }

android-activity/src/lib.rs

@@ -268,9 +268,9 @@ pub enum MainEvent<'a> {
     /// input focus.
     LostFocus,
 
-    /// Command from main thread: the current device configuration has changed.
-    /// You can get a copy of the latest [`ndk::configuration::Configuration`] by calling
-    /// [`AndroidApp::config()`]
+    /// Command from main thread: the current device configuration has changed.  Any
+    /// reference gotten via [`AndroidApp::config()`] will automatically contain the latest
+    /// [`ndk::configuration::Configuration`].
     #[non_exhaustive]
     ConfigChanged {},
 
@@ -617,7 +617,14 @@ impl AndroidApp {
         self.inner.read().unwrap().create_waker()
     }
 
-    /// Returns a (cheaply clonable) reference to this application's [`ndk::configuration::Configuration`]
+    /// Returns a **reference** to this application's [`ndk::configuration::Configuration`].
+    ///
+    /// # Warning
+    ///
+    /// The value held by this reference **will change** with every [`MainEvent::ConfigChanged`]
+    /// event that is raised.  You should **not** [`Clone`] this type to compare it against a
+    /// "new" [`AndroidApp::config()`] when that event is raised, since both point to the same
+    /// internal [`ndk::configuration::Configuration`] and will be identical.
     pub fn config(&self) -> ConfigurationRef {
         self.inner.read().unwrap().config()
     }

android-activity/src/native_activity/glue.rs

@@ -81,12 +81,14 @@ pub struct WaitableNativeActivityState {
     pub cond: Condvar,
 }
 
+// SAFETY: ndk::NativeActivity is also SendSync.
+unsafe impl Send for WaitableNativeActivityState {}
+unsafe impl Sync for WaitableNativeActivityState {}
+
 #[derive(Debug, Clone)]
 pub struct NativeActivityGlue {
     pub inner: Arc<WaitableNativeActivityState>,
 }
-unsafe impl Send for NativeActivityGlue {}
-unsafe impl Sync for NativeActivityGlue {}
 
 impl Deref for NativeActivityGlue {
     type Target = WaitableNativeActivityState;
@@ -223,7 +225,6 @@ pub struct NativeActivityState {
     /// Set as soon as the Java main thread notifies us of an
     /// `onDestroyed` callback.
     pub destroyed: bool,
-    pub redraw_needed: bool,
     pub pending_input_queue: *mut ndk_sys::AInputQueue,
     pub pending_window: Option<NativeWindow>,
 }
@@ -370,7 +371,6 @@ impl WaitableNativeActivityState {
                 thread_state: NativeThreadState::Init,
                 app_has_saved_state: false,
                 destroyed: false,
-                redraw_needed: false,
                 pending_input_queue: ptr::null_mut(),
                 pending_window: None,
             }),

android-activity/src/native_activity/input.rs

@@ -15,7 +15,7 @@ pub struct MotionEvent<'a> {
     ndk_event: ndk::event::MotionEvent,
     _lifetime: PhantomData<&'a ndk::event::MotionEvent>,
 }
-impl<'a> MotionEvent<'a> {
+impl MotionEvent<'_> {
     pub(crate) fn new(ndk_event: ndk::event::MotionEvent) -> Self {
         Self {
             ndk_event,
@@ -248,7 +248,7 @@ pub(crate) struct PointerImpl<'a> {
     ndk_pointer: ndk::event::Pointer<'a>,
 }
 
-impl<'a> PointerImpl<'a> {
+impl PointerImpl<'_> {
     #[inline]
     pub fn pointer_index(&self) -> usize {
         self.ndk_pointer.pointer_index()
@@ -303,7 +303,7 @@ impl<'a> Iterator for PointersIterImpl<'a> {
     }
 }
 
-impl<'a> ExactSizeIterator for PointersIterImpl<'a> {
+impl ExactSizeIterator for PointersIterImpl<'_> {
     fn len(&self) -> usize {
         self.ndk_pointers_iter.len()
     }
@@ -319,7 +319,7 @@ pub struct KeyEvent<'a> {
     ndk_event: ndk::event::KeyEvent,
     _lifetime: PhantomData<&'a ndk::event::KeyEvent>,
 }
-impl<'a> KeyEvent<'a> {
+impl KeyEvent<'_> {
     pub(crate) fn new(ndk_event: ndk::event::KeyEvent) -> Self {
         Self {
             ndk_event,

android-activity/src/native_activity/mod.rs

@@ -53,7 +53,7 @@ impl<'a> StateSaver<'a> {
 pub struct StateLoader<'a> {
     app: &'a AndroidAppInner,
 }
-impl<'a> StateLoader<'a> {
+impl StateLoader<'_> {
     /// Returns whatever state was saved during the last [MainEvent::SaveState] event or `None`
     pub fn load(&self) -> Option<Vec<u8>> {
         self.app.native_activity.saved_state()
@@ -465,7 +465,7 @@ pub(crate) struct InputReceiver {
     queue: Option<InputQueue>,
 }
 
-impl<'a> From<Arc<InputReceiver>> for InputIteratorInner<'a> {
+impl From<Arc<InputReceiver>> for InputIteratorInner<'_> {
     fn from(receiver: Arc<InputReceiver>) -> Self {
         Self {
             receiver,
@@ -480,7 +480,7 @@ pub(crate) struct InputIteratorInner<'a> {
     _lifetime: PhantomData<&'a ()>,
 }
 
-impl<'a> InputIteratorInner<'a> {
+impl InputIteratorInner<'_> {
     pub(crate) fn next<F>(&self, callback: F) -> bool
     where
         F: FnOnce(&input::InputEvent) -> InputStatus,