feat: add ThemeBuilder

cosmic-theme/src/model/corner.rs

@@ -0,0 +1,31 @@
+use serde::{Deserialize, Serialize};
+
+/// Corner radii variables for the Cosmic theme
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Deserialize, Serialize)]
+pub struct CornerRadii {
+    /// corner radii of 0
+    pub radius_0: [u16; 4],
+    /// smallest size of corner radii that can be non-zero
+    pub radius_xs: [u16; 4],
+    /// small corner radii
+    pub radius_s: [u16; 4],
+    /// medium corner radii
+    pub radius_m: [u16; 4],
+    /// large corner radii
+    pub radius_l: [u16; 4],
+    /// extra large corner radii
+    pub radius_xl: [u16; 4],
+}
+
+impl Default for CornerRadii {
+    fn default() -> Self {
+        Self {
+            radius_0: [0; 4],
+            radius_xs: [4; 4],
+            radius_s: [8; 4],
+            radius_m: [16; 4],
+            radius_l: [32; 4],
+            radius_xl: [160; 4],
+        }
+    }
+}