Allow creating Colors in a const context. (#135)

Co-authored-by: Daniel McNab <[email protected]>

src/color.rs

@@ -223,6 +223,20 @@ impl Color {
         a: NV_ONE,
     };
 
+    /// Creates a new color from 4 components.
+    ///
+    /// # Safety
+    ///
+    /// All values must be in 0..=1 range.
+    pub const unsafe fn from_rgba_unchecked(r: f32, g: f32, b: f32, a: f32) -> Self {
+        Color {
+            r: NormalizedF32::new_unchecked(r),
+            g: NormalizedF32::new_unchecked(g),
+            b: NormalizedF32::new_unchecked(b),
+            a: NormalizedF32::new_unchecked(a),
+        }
+    }
+
     /// Creates a new color from 4 components.
     ///
     /// All values must be in 0..=1 range.