Share native theme components and fix dialog backdrop blur

Centralize native palettes, presets, typography, controls, menus, calendar rendering, and icon assets in ferese-theme. Reuse the shared components across the shell, settings, lock screen, authentication prompt, and screen-sharing chooser.

Attach themed dialogs to compositor-owned materials, correct backdrop capture and sampling across output transforms, smooth patterned backgrounds, and prevent clipped picker buttons with the configured shell font.

crates/ferese-theme/src/material.rs

@@ -0,0 +1,121 @@
+use std::sync::Arc;
+
+use ferese_protocols::material::v1::client::{
+    ferese_material_manager_v1::FereseMaterialManagerV1,
+    ferese_surface_material_v1::FereseSurfaceMaterialV1,
+};
+use wayland_client::{
+    Connection, Dispatch, Proxy, QueueHandle, delegate_noop,
+    globals::{GlobalListContents, registry_queue_init},
+    protocol::{wl_registry, wl_surface},
+};
+
+/// Keeps a compositor-owned dialog material attached for the window lifetime.
+#[derive(Clone, Debug)]
+pub struct ModalMaterial {
+    _binding: Arc<Binding>,
+}
+
+#[derive(Debug)]
+struct Binding {
+    connection: Connection,
+    manager: FereseMaterialManagerV1,
+    material: FereseSurfaceMaterialV1,
+}
+
+impl ModalMaterial {
+    /// Attach while Iced owns the native window; keep its background transparent on success.
+    /// Other compositors return an error so the caller can retain its own surface fill.
+    pub fn attach(window: &dyn cosmic::iced::window::Window) -> Result<Self, String> {
+        use cosmic::iced::window::raw_window_handle::{RawDisplayHandle, RawWindowHandle};
+
+        let display = window.display_handle().map_err(|error| error.to_string())?;
+        let handle = window.window_handle().map_err(|error| error.to_string())?;
+        let (RawDisplayHandle::Wayland(display), RawWindowHandle::Wayland(handle)) =
+            (display.as_raw(), handle.as_raw())
+        else {
+            return Err("Dialog materials require Wayland".into());
+        };
+        // Iced lends live native handles; this backend borrows its connection.
+        let backend = unsafe {
+            wayland_client::backend::Backend::from_foreign_display(display.display.as_ptr().cast())
+        };
+        let connection = Connection::from_backend(backend);
+        let id = unsafe {
+            wayland_client::backend::ObjectId::from_ptr(
+                wl_surface::WlSurface::interface(),
+                handle.surface.as_ptr().cast(),
+            )
+        }
+        .map_err(|error| error.to_string())?;
+        let surface =
+            wl_surface::WlSurface::from_id(&connection, id).map_err(|error| error.to_string())?;
+        let (globals, mut queue) =
+            registry_queue_init::<MaterialState>(&connection).map_err(|error| error.to_string())?;
+        let qh = queue.handle();
+        let manager = globals
+            .bind::<FereseMaterialManagerV1, _, _>(&qh, 1..=1, ())
+            .map_err(|error| error.to_string())?;
+        let material = manager.get_surface_material(&surface, &qh, ());
+        let binding = Binding {
+            connection,
+            manager,
+            material,
+        };
+        let mut state = MaterialState::default();
+        queue
+            .roundtrip(&mut state)
+            .map_err(|error| error.to_string())?;
+        if !state.ready {
+            return Err("Dialog material attachment was not acknowledged".into());
+        }
+        Ok(Self {
+            _binding: Arc::new(binding),
+        })
+    }
+}
+
+impl Drop for Binding {
+    fn drop(&mut self) {
+        self.material.destroy();
+        self.manager.destroy();
+        let _ = self.connection.flush();
+    }
+}
+
+#[derive(Default)]
+struct MaterialState {
+    ready: bool,
+}
+
+impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for MaterialState {
+    fn event(
+        _state: &mut Self,
+        _registry: &wl_registry::WlRegistry,
+        _event: wl_registry::Event,
+        _data: &GlobalListContents,
+        _connection: &Connection,
+        _qh: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<FereseSurfaceMaterialV1, ()> for MaterialState {
+    fn event(
+        state: &mut Self,
+        _material: &FereseSurfaceMaterialV1,
+        event: ferese_protocols::material::v1::client::ferese_surface_material_v1::Event,
+        _data: &(),
+        _connection: &Connection,
+        _qh: &QueueHandle<Self>,
+    ) {
+        if matches!(
+            event,
+            ferese_protocols::material::v1::client::ferese_surface_material_v1::Event::Ready
+        ) {
+            state.ready = true;
+        }
+    }
+}
+
+delegate_noop!(MaterialState: ignore FereseMaterialManagerV1);