message: remove unnecessary new matrix
diff: @@ -952,7 +952,7 @@ impl DrawParam {
  0.0, 0.0, 1.0, 0.0,
  0.0, 0.0, 0.0, 1.0,
  );
  - translate * offset * rotation * shear * scale * offset_inverse * Matrix4::identity()
  + translate * offset * rotation * shear * scale * offset_inverse
  }
  }
  