fix mask coords... might wanna change cpu output?

src/core/mask.rs

@@ -6,6 +6,7 @@ pub struct Masked {
 
 impl Widget for Masked {
     fn draw(&mut self, painter: &mut Painter) {
+        println!("yahoo! {}", painter.region());
         painter.set_mask(painter.region());
         painter.widget(&self.inner);
     }