Match shell squircle outlines with compositor masks

Use shared corner geometry for shell controls, window clipping, materials and blur masks. Preserve circular pills and controls where appropriate, track contour changes in damage, and use tagged ferese-shape and libcosmic dependencies.

compositor/src/render/mod.rs

@@ -119,7 +119,7 @@ const MATERIAL_SHADER: &str = include_str!("shaders/material_shader.frag");
 const BLUR_SHADER: &str = include_str!("shaders/blur_shader.frag");
 
 fn corner_shader(source: &str) -> String {
-    corner_shader_for(source, CornerShape::Circular)
+    corner_shader_for(source, CornerShape::Continuous)
 }
 
 fn corner_shader_for(source: &str, shape: CornerShape) -> String {
@@ -137,21 +137,9 @@ fn corner_shader_for(source: &str, shape: CornerShape) -> String {
     }
 }
 
-pub(crate) fn window_corner_shape(window: &smithay::desktop::Window) -> CornerShape {
-    // Semantic shell surfaces keep their client-matching circular outlines.
-    corner_shape_for_role(
-        window
-            .toplevel()
-            .and_then(|toplevel| crate::effects::surface_role(toplevel.wl_surface()).map(|(role, _)| role)),
-    )
-}
-
-fn corner_shape_for_role(role: Option<crate::effects::SemanticRole>) -> CornerShape {
-    if role.is_some() {
-        CornerShape::Circular
-    } else {
-        CornerShape::Continuous
-    }
+pub(crate) fn window_corner_shape(_window: &smithay::desktop::Window) -> CornerShape {
+    // Shell surfaces and application windows use the same shared squircle profile.
+    CornerShape::Continuous
 }
 
 #[derive(Clone, Debug)]