show the oklab color space

Cargo.lock

@@ -204,6 +204,12 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "fast-srgb8"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd2e7510819d6fbf51a5545c8f922716ecfb14df168a3242f7d33e0239efe6a1"
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.6"
@@ -285,6 +291,16 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "oklab"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1e35ab3c8efa6bc97d651abe7fb051aebb30c925a450ff6722cf9c797a938cc"
+dependencies = [
+ "fast-srgb8",
+ "rgb",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -394,6 +410,12 @@ version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
 
+[[package]]
+name = "rgb"
+version = "0.8.52"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c6a884d2998352bb4daf0183589aec883f16a6da1f4dde84d8e2e9a5409a1ce"
+
 [[package]]
 name = "rustix"
 version = "1.1.3"
@@ -542,6 +564,7 @@ dependencies = [
  "env_logger",
  "eyre",
  "log",
+ "oklab",
  "smithay-client-toolkit",
  "wayland-client",
 ]

Cargo.toml

@@ -7,5 +7,6 @@ edition = "2024"
 env_logger = "0.11.8"
 eyre = "0.6.12"
 log = "0.4.29"
+oklab = "1.1.2"
 smithay-client-toolkit = "0.20.0"
 wayland-client = "0.31.11"

src/main.rs

@@ -130,6 +130,15 @@ impl OutputHandler for App {
         _qh: &QueueHandle<Self>,
         output: wayland_client::protocol::wl_output::WlOutput,
     ) {
+        match self.output_state.info(&output) {
+            None => warn!("Output disconnected, unknown information"),
+            Some(info) => {
+                info!(
+                    "Output disconnected ({})",
+                    info.description.unwrap_or_else(|| "<unknown>".into()),
+                );
+            }
+        }
         if let Some(suface_idx) = self
             .layer_surfaces
             .iter()
@@ -215,10 +224,19 @@ impl LayerShellHandler for App {
                 let x = (index % width as usize) as u32;
                 let y = (index / width as usize) as u32;
 
+                let xf = x as f32 / width as f32;
+                let yf = y as f32 / height as f32;
+
+                let srgb = oklab::oklab_to_srgb(oklab::Oklab {
+                    l: 0.7,
+                    a: xf * 0.8 - 0.4,
+                    b: yf * 0.8 - 0.4,
+                });
+
                 let a = 0xFF;
-                let r = u32::min(((width - x) * 0xFF) / width, ((height - y) * 0xFF) / height);
+                let r = srgb.r as u32;
-                let g = u32::min((x * 0xFF) / width, ((height - y) * 0xFF) / height);
+                let g = srgb.g as u32;
-                let b = u32::min(((width - x) * 0xFF) / width, (y * 0xFF) / height);
+                let b = srgb.b as u32;
                 let color = (a << 24) + (r << 16) + (g << 8) + b;
 
                 let array: &mut [u8; 4] = chunk.try_into().unwrap();