Add From<((left,right), (top, bottom))> to Vec4

src/vec.rs

@@ -215,6 +215,18 @@ impl From<(i32, i32, i32, i32)> for Vec4 {
     }
 }
 
+impl From<((i32, i32), (i32, i32))> for Vec4 {
+    fn from(((left, right), (top, bottom)): ((i32, i32), (i32, i32))) -> Vec4 {
+        (left, right, top, bottom).into()
+    }
+}
+impl From<((usize, usize), (usize, usize))> for Vec4 {
+    fn from(((left, right), (top, bottom)): ((usize, usize), (usize, usize)))
+            -> Vec4 {
+        (left, right, top, bottom).into()
+    }
+}
+
 impl<T: Into<Vec4>> Add<T> for Vec4 {
     type Output = Vec4;