How to copy background circle on libgdx?

Question

Java

The put-pixel / set-pixel option is quite gluttonous for realtime, and even for mobile phones.
OpenGL has such a wonderful feature as the Stencil buffer. But I don't own it at all.
Tell me how to copy (not cut) a part of the background at the given XY coordinates in the form of a mask-circle using this buffer, and apply it to the same background but with some offset.