Comment by transpute

It's doing VNC-alike "graphics remoting", but with less isolation/security in the name of efficiency/performance:

> We thought this is too inefficient. So we decided to combine both into a single application, to eliminate most of the interprocess communication, and avoid having the Linux server run in the background, and thus suffering from power optimizations. We still have a framebuffer, but we do the scrapping and updating directly. We have reduced all the hassle to mere memcpy and texture update operations. This turned out to be huge! In the future, we hope to reduce this overhead even further by rendering directly to the texture, and this saving the need to scrape and copy memory.

When the next release of Android Linux Terminal ships vGPU with virtio, it will provide better graphics performance than VNC, while retaining strong security isolation between Debian guest VM and host Android.