wayland: implement surface transformations

- buffer scale
- buffer transform
- viewporter

src/ifs/wp_viewporter.rs

@@ -0,0 +1,104 @@
+use {
+    crate::{
+        client::{Client, ClientError},
+        globals::{Global, GlobalName},
+        ifs::wl_surface::wp_viewport::{WpViewport, WpViewportError},
+        leaks::Tracker,
+        object::Object,
+        utils::buffd::{MsgParser, MsgParserError},
+        wire::{wp_viewporter::*, WpViewporterId},
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct WpViewporterGlobal {
+    pub name: GlobalName,
+}
+
+impl WpViewporterGlobal {
+    pub fn new(name: GlobalName) -> Self {
+        Self { name }
+    }
+
+    fn bind_(
+        self: Rc<Self>,
+        id: WpViewporterId,
+        client: &Rc<Client>,
+        _version: u32,
+    ) -> Result<(), WpViewporterError> {
+        let obj = Rc::new(WpViewporter {
+            id,
+            client: client.clone(),
+            tracker: Default::default(),
+        });
+        track!(client, obj);
+        client.add_client_obj(&obj)?;
+        Ok(())
+    }
+}
+
+global_base!(WpViewporterGlobal, WpViewporter, WpViewporterError);
+
+impl Global for WpViewporterGlobal {
+    fn singleton(&self) -> bool {
+        true
+    }
+
+    fn version(&self) -> u32 {
+        1
+    }
+}
+
+simple_add_global!(WpViewporterGlobal);
+
+pub struct WpViewporter {
+    pub id: WpViewporterId,
+    pub client: Rc<Client>,
+    pub tracker: Tracker<Self>,
+}
+
+impl WpViewporter {
+    fn destroy(&self, msg: MsgParser<'_, '_>) -> Result<(), WpViewporterError> {
+        let _req: Destroy = self.client.parse(self, msg)?;
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+
+    fn get_viewport(&self, msg: MsgParser<'_, '_>) -> Result<(), WpViewporterError> {
+        let req: GetViewport = self.client.parse(self, msg)?;
+        let surface = self.client.lookup(req.surface)?;
+        let viewport = Rc::new(WpViewport::new(req.id, &surface));
+        track!(self.client, viewport);
+        viewport.install()?;
+        self.client.add_client_obj(&viewport)?;
+        Ok(())
+    }
+}
+
+object_base! {
+    WpViewporter;
+
+    DESTROY => destroy,
+    GET_VIEWPORT => get_viewport,
+}
+
+impl Object for WpViewporter {
+    fn num_requests(&self) -> u32 {
+        GET_VIEWPORT + 1
+    }
+}
+
+simple_add_obj!(WpViewporter);
+
+#[derive(Debug, Error)]
+pub enum WpViewporterError {
+    #[error("Parsing failed")]
+    MsgParserError(#[source] Box<MsgParserError>),
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+    #[error(transparent)]
+    WpViewportError(#[from] WpViewportError),
+}
+efrom!(WpViewporterError, MsgParserError);
+efrom!(WpViewporterError, ClientError);