Make clear color a const

The damage tracker doesn't understand clear color changes.

src/backend/tty.rs

@@ -39,7 +39,7 @@ use smithay_drm_extras::drm_scanner::{DrmScanEvent, DrmScanner};
 use smithay_drm_extras::edid::EdidInfo;
 
 use crate::config::Config;
-use crate::niri::{OutputRenderElements, State, RedrawState};
+use crate::niri::{OutputRenderElements, State, RedrawState, CLEAR_COLOR};
 use crate::utils::get_monotonic_time;
 use crate::Niri;
 
@@ -861,7 +861,7 @@ impl Tty {
         match drm_compositor.render_frame::<_, _, GlesTexture>(
             &mut device.gles,
             elements,
-            niri.clear_color(),
+            CLEAR_COLOR,
         ) {
             Ok(res) => {
                 if self

src/backend/winit.rs

@@ -19,7 +19,7 @@ use smithay::utils::Transform;
 
 use super::RenderResult;
 use crate::config::Config;
-use crate::niri::{OutputRenderElements, RedrawState, State};
+use crate::niri::{OutputRenderElements, RedrawState, State, CLEAR_COLOR};
 use crate::utils::get_monotonic_time;
 use crate::Niri;
 
@@ -157,10 +157,9 @@ impl Winit {
 
         self.backend.bind().unwrap();
         let age = self.backend.buffer_age().unwrap();
-        let clear_color = niri.clear_color();
         let res = self
             .damage_tracker
-            .render_output(self.backend.renderer(), age, elements, clear_color)
+            .render_output(self.backend.renderer(), age, elements, CLEAR_COLOR)
             .unwrap();
 
         niri.update_primary_scanout_output(output, &res.states);

src/niri.rs

@@ -84,6 +84,8 @@ use crate::layout::{output_size, Layout, MonitorRenderElement};
 use crate::pw_utils::{Cast, PipeWire};
 use crate::utils::{center, get_monotonic_time, make_screenshot_path};
 
+pub const CLEAR_COLOR: [f32; 4] = [0.2, 0.2, 0.2, 1.];
+
 pub struct Niri {
     pub config: Rc<RefCell<Config>>,
 
@@ -888,10 +890,6 @@ impl Niri {
         };
     }
 
-    pub fn clear_color(&self) -> [f32; 4] {
-        [0.1, 0.1, 0.1, 1.0]
-    }
-
     pub fn pointer_element(
         &mut self,
         renderer: &mut GlesRenderer,
@@ -1416,7 +1414,6 @@ impl Niri {
 
         let size = output.current_mode().unwrap().size;
         let scale = Scale::from(output.current_scale().fractional_scale());
-        let clear_color = self.clear_color();
 
         for cast in &mut self.casts {
             if !cast.is_active.get() {
@@ -1452,9 +1449,7 @@ impl Niri {
                 let dmabuf = cast.dmabufs.borrow()[&fd].clone();
 
                 // FIXME: Hidden / embedded / metadata cursor
-                if let Err(err) =
-                    render_to_dmabuf(renderer, dmabuf, size, scale, clear_color, elements)
-                {
+                if let Err(err) = render_to_dmabuf(renderer, dmabuf, size, scale, elements) {
                     error!("error rendering to dmabuf: {err:?}");
                     continue;
                 }
@@ -1737,7 +1732,6 @@ fn render_to_dmabuf(
     dmabuf: smithay::backend::allocator::dmabuf::Dmabuf,
     size: Size<i32, Physical>,
     scale: Scale<f64>,
-    clear_color: [f32; 4],
     elements: &[OutputRenderElements<GlesRenderer>],
 ) -> anyhow::Result<()> {
     use smithay::backend::renderer::element::Element;
@@ -1752,7 +1746,7 @@ fn render_to_dmabuf(
         .context("error starting frame")?;
 
     frame
-        .clear(clear_color, &[output_rect])
+        .clear(CLEAR_COLOR, &[output_rect])
         .context("error clearing")?;
 
     for element in elements.iter().rev() {