config: store font names in Arc

src/config/handler.rs

@@ -13,7 +13,7 @@ use {
         output_schedule::map_cursor_hz,
         scale::Scale,
         state::{ConnectorData, DeviceHandlerData, DrmDevData, OutputData, State},
-        theme::{Color, ThemeSized, DEFAULT_FONT},
+        theme::{Color, ThemeSized},
         tree::{
             move_ws_to_output, ContainerNode, ContainerSplit, FloatNode, Node, NodeVisitorBase,
             OutputNode, TearingMode, VrrMode, WsMoveConfig,
@@ -57,7 +57,7 @@ use {
     },
     libloading::Library,
     log::Level,
-    std::{cell::Cell, ops::Deref, rc::Rc, time::Duration},
+    std::{cell::Cell, ops::Deref, rc::Rc, sync::Arc, time::Duration},
     thiserror::Error,
     uapi::{c, fcntl_dupfd_cloexec, OwnedFd},
 };
@@ -1525,15 +1525,18 @@ impl ConfigProxyHandler {
     }
 
     fn handle_reset_font(&self) {
-        *self.state.theme.font.borrow_mut() = DEFAULT_FONT.to_string();
+        self.state
+            .theme
+            .font
+            .set(self.state.theme.default_font.clone());
     }
 
     fn handle_set_font(&self, font: &str) {
-        *self.state.theme.font.borrow_mut() = font.to_string();
+        self.state.theme.font.set(Arc::new(font.to_string()));
     }
 
     fn handle_get_font(&self) {
-        let font = self.state.theme.font.borrow_mut().clone();
+        let font = self.state.theme.font.get().to_string();
         self.respond(Response::GetFont { font });
     }
 

src/theme.rs

@@ -1,7 +1,6 @@
-use std::{
-    cell::{Cell, RefCell},
-    cmp::Ordering,
-    ops::Mul,
+use {
+    crate::utils::clonecell::CloneCell,
+    std::{cell::Cell, cmp::Ordering, ops::Mul, sync::Arc},
 };
 
 #[derive(Copy, Clone, Debug, PartialEq)]
@@ -290,15 +289,18 @@ pub const DEFAULT_FONT: &str = "monospace 8";
 pub struct Theme {
     pub colors: ThemeColors,
     pub sizes: ThemeSizes,
-    pub font: RefCell<String>,
+    pub font: CloneCell<Arc<String>>,
+    pub default_font: Arc<String>,
 }
 
 impl Default for Theme {
     fn default() -> Self {
+        let default_font = Arc::new(DEFAULT_FONT.to_string());
         Self {
             colors: Default::default(),
             sizes: Default::default(),
-            font: RefCell::new(DEFAULT_FONT.to_string()),
+            font: CloneCell::new(default_font.clone()),
+            default_font,
         }
     }
 }

src/tree/container.rs

@@ -673,7 +673,7 @@ impl ContainerNode {
         let theme = &self.state.theme;
         let th = theme.sizes.title_height.get();
         let bw = theme.sizes.border_width.get();
-        let font = theme.font.borrow_mut();
+        let font = theme.font.get();
         let cwidth = self.width.get();
         let cheight = self.height.get();
         let ctx = self.state.render_ctx.get();

src/tree/float.rs

@@ -191,7 +191,7 @@ impl FloatNode {
             false => theme.colors.unfocused_title_text.get(),
         };
         let bw = theme.sizes.border_width.get();
-        let font = theme.font.borrow_mut();
+        let font = theme.font.get();
         let title = self.title.borrow_mut();
         let pos = self.position.get();
         if pos.width() <= 2 * bw || title.is_empty() {

src/tree/output.rs

@@ -377,7 +377,7 @@ impl OutputNode {
         rd.active_workspace = None;
         rd.status = None;
         let mut pos = 0;
-        let font = self.state.theme.font.borrow_mut();
+        let font = self.state.theme.font.get();
         let theme = &self.state.theme;
         let th = theme.sizes.title_height.get();
         let scale = self.global.persistent.scale.get();

src/utils/clonecell.rs

@@ -9,6 +9,7 @@ use {
         fmt::{Debug, Formatter},
         mem,
         rc::{Rc, Weak},
+        sync::Arc,
     },
 };
 
@@ -83,6 +84,7 @@ unsafe impl<T: UnsafeCellCloneSafe> UnsafeCellCloneSafe for Option<T> {}
 
 unsafe impl<T: ?Sized> UnsafeCellCloneSafe for Rc<T> {}
 unsafe impl<T: ?Sized> UnsafeCellCloneSafe for Weak<T> {}
+unsafe impl<T: ?Sized> UnsafeCellCloneSafe for Arc<T> {}
 
 unsafe impl<T> UnsafeCellCloneSafe for NodeRef<T> {}