cairo/matrix.go
func (m *Matrix) TransformDistance(dx, dy float64) (float64, float64) {
	C.cairo_matrix_transform_distance(m.native(),
		(*C.double)(unsafe.Pointer(&dx)), (*C.double)(unsafe.Pointer(&dy)))
	return dx, dy
}
func (m *Matrix) TransformDistance(dx, dy float64) (float64, float64) {
	C.cairo_matrix_transform_distance(m.native(),
		(*C.double)(unsafe.Pointer(&dx)), (*C.double)(unsafe.Pointer(&dy)))
	return dx, dy
}
// TransformDistance ...