wayland: implement wp_single_pixel_buffer_manager_v1

src/theme.rs

@@ -51,6 +51,18 @@ impl Color {
         }
     }
 
+    pub fn from_u32_rgba_premultiplied(r: u32, g: u32, b: u32, a: u32) -> Self {
+        fn to_f32(c: u32) -> f32 {
+            ((c as f64) / (u32::MAX as f64)) as f32
+        }
+        Self {
+            r: to_f32(r),
+            g: to_f32(g),
+            b: to_f32(b),
+            a: to_f32(a),
+        }
+    }
+
     pub fn from_rgba_straight(r: u8, g: u8, b: u8, a: u8) -> Self {
         let alpha = to_f32(a);
         Self {