wayland: implement commit-timing-v1

src/ifs/wl_surface/wp_commit_timer_v1.rs

@@ -0,0 +1,94 @@
+use {
+    crate::{
+        client::{Client, ClientError},
+        ifs::wl_surface::WlSurface,
+        leaks::Tracker,
+        object::{Object, Version},
+        wire::{
+            wp_commit_timer_v1::{Destroy, SetTimestamp, WpCommitTimerV1RequestHandler},
+            WpCommitTimerV1Id,
+        },
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct WpCommitTimerV1 {
+    pub id: WpCommitTimerV1Id,
+    pub client: Rc<Client>,
+    pub surface: Rc<WlSurface>,
+    pub tracker: Tracker<Self>,
+    pub version: Version,
+}
+
+impl WpCommitTimerV1 {
+    pub fn new(id: WpCommitTimerV1Id, version: Version, surface: &Rc<WlSurface>) -> Self {
+        Self {
+            id,
+            client: surface.client.clone(),
+            surface: surface.clone(),
+            tracker: Default::default(),
+            version,
+        }
+    }
+
+    pub fn install(self: &Rc<Self>) -> Result<(), WpCommitTimerV1Error> {
+        if self.surface.commit_timer.is_some() {
+            return Err(WpCommitTimerV1Error::Exists);
+        }
+        self.surface.commit_timer.set(Some(self.clone()));
+        Ok(())
+    }
+}
+
+impl WpCommitTimerV1RequestHandler for WpCommitTimerV1 {
+    type Error = WpCommitTimerV1Error;
+
+    fn set_timestamp(&self, req: SetTimestamp, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        if req.tv_nsec >= 1_000_000_000 {
+            return Err(WpCommitTimerV1Error::InvalidNsec);
+        }
+        let nsec = (((req.tv_sec_hi as u64) << 32) | (req.tv_sec_lo as u64))
+            .checked_mul(1_000_000_000)
+            .and_then(|n| n.checked_add(req.tv_nsec as u64));
+        let Some(nsec) = nsec else {
+            return Err(WpCommitTimerV1Error::Overflow);
+        };
+        let pending = &mut *self.surface.pending.borrow_mut();
+        if pending.commit_time.is_some() {
+            return Err(WpCommitTimerV1Error::TimestampExists);
+        }
+        pending.commit_time = Some(nsec);
+        Ok(())
+    }
+
+    fn destroy(&self, _req: Destroy, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        self.surface.commit_timer.take();
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+}
+
+object_base! {
+    self = WpCommitTimerV1;
+    version = self.version;
+}
+
+impl Object for WpCommitTimerV1 {}
+
+simple_add_obj!(WpCommitTimerV1);
+
+#[derive(Debug, Error)]
+pub enum WpCommitTimerV1Error {
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+    #[error("The surface already has a commit timer extension attached")]
+    Exists,
+    #[error("The tv_nsec is larger than 999_999_999")]
+    InvalidNsec,
+    #[error("The timestamp overflowed")]
+    Overflow,
+    #[error("The commit already has a timestamp")]
+    TimestampExists,
+}
+efrom!(WpCommitTimerV1Error, ClientError);