Skip rendering when backend is inactive

src/backend/mod.rs

@@ -100,6 +100,13 @@ impl Backend {
         }
     }
 
+    pub fn is_active(&self) -> bool {
+        match self {
+            Backend::Tty(tty) => tty.is_active(),
+            Backend::Winit(_) => true,
+        }
+    }
+
     pub fn tty(&mut self) -> &mut Tty {
         if let Self::Tty(v) = self {
             v

src/backend/tty.rs

@@ -813,6 +813,14 @@ impl Tty {
     pub fn gbm_device(&self) -> Option<GbmDevice<DrmDeviceFd>> {
         self.output_device.as_ref().map(|d| d.gbm.clone())
     }
+
+    pub fn is_active(&self) -> bool {
+        let Some(device) = &self.output_device else {
+            return false;
+        };
+
+        device.drm.is_active()
+    }
 }
 
 fn refresh_interval(mode: DrmMode) -> Duration {

src/niri.rs

@@ -945,6 +945,10 @@ impl Niri {
     fn redraw(&mut self, backend: &mut Backend, output: &Output) {
         let _span = tracy_client::span!("Niri::redraw");
 
+        if !backend.is_active() {
+            return;
+        }
+
         let Some(renderer) = backend.renderer() else {
             return;
         };