wayland: add a generic wayland client

src/wl_usr/usr_ifs/usr_jay_render_ctx.rs

@@ -0,0 +1,60 @@
+use {
+    crate::{
+        utils::{
+            buffd::{MsgParser, MsgParserError},
+            clonecell::CloneCell,
+        },
+        wire::{jay_render_ctx::*, JayRenderCtxId},
+        wl_usr::{usr_object::UsrObject, UsrCon},
+    },
+    std::rc::Rc,
+    uapi::OwnedFd,
+};
+
+pub struct UsrJayRenderCtx {
+    pub id: JayRenderCtxId,
+    pub con: Rc<UsrCon>,
+    pub owner: CloneCell<Option<Rc<dyn UsrJayRenderCtxOwner>>>,
+}
+
+pub trait UsrJayRenderCtxOwner {
+    fn no_device(&self) {}
+    fn device(&self, fd: Rc<OwnedFd>) {
+        let _ = fd;
+    }
+}
+
+impl UsrJayRenderCtx {
+    fn no_device(&self, parser: MsgParser<'_, '_>) -> Result<(), MsgParserError> {
+        let _ev: NoDevice = self.con.parse(self, parser)?;
+        if let Some(owner) = self.owner.get() {
+            owner.no_device();
+        }
+        Ok(())
+    }
+
+    fn device(&self, parser: MsgParser<'_, '_>) -> Result<(), MsgParserError> {
+        let ev: Device = self.con.parse(self, parser)?;
+        if let Some(owner) = self.owner.get() {
+            owner.device(ev.fd);
+        }
+        Ok(())
+    }
+}
+
+usr_object_base! {
+    UsrJayRenderCtx, JayRenderCtx;
+
+    NO_DEVICE => no_device,
+    DEVICE => device,
+}
+
+impl UsrObject for UsrJayRenderCtx {
+    fn destroy(&self) {
+        self.con.request(Destroy { self_id: self.id });
+    }
+
+    fn break_loops(&self) {
+        self.owner.take();
+    }
+}