theme: store colors in linear space

src/it/tests/t0007_subsurface.rs

@@ -34,7 +34,7 @@ async fn test(run: Rc<TestRun>) -> Result<(), TestError> {
 
     let buffer = client
         .spbm
-        .create_buffer(Color::from_rgba_straight(255, 255, 255, 255))?;
+        .create_buffer(Color::from_srgba_straight(255, 255, 255, 255))?;
 
     child.attach(buffer.id)?;
     child_viewport.set_source(0, 0, 1, 1)?;

src/it/tests/t0020_surface_offset.rs

@@ -25,7 +25,7 @@ async fn test(run: Rc<TestRun>) -> Result<(), TestError> {
     let win1 = client.create_window().await?;
     win1.map2().await?;
 
-    let buffer = client.spbm.create_buffer(Color::from_rgb(255, 0, 0))?;
+    let buffer = client.spbm.create_buffer(Color::from_srgb(255, 0, 0))?;
     let surface = client.comp.create_surface().await?;
     let vp = client.viewporter.get_viewport(&surface)?;
     vp.set_destination(100, 100)?;

src/it/tests/t0039_alpha_modifier.rs

@@ -36,11 +36,11 @@ async fn test(run: Rc<TestRun>) -> TestResult {
         }};
     }
 
-    let buf1 = client.spbm.create_buffer(Color::from_rgb(0, 255, 0))?;
+    let buf1 = client.spbm.create_buffer(Color::from_srgb(0, 255, 0))?;
     let (ss1, alpha1) = create_surface!(&buf1, 0, 0);
 
     let buf2 = client.shm.create_buffer(1, 1)?;
-    buf2.fill(Color::from_rgb(0, 255, 0));
+    buf2.fill(Color::from_srgb(0, 255, 0));
     let (ss2, alpha2) = create_surface!(&buf2.buffer, 100, 0);
 
     client.compare_screenshot("1", false).await?;