How do you get Graphics in Native NT Text-Mode?

Question

Apparently, the EASEUS Partition Master program can display graphics before the Windows GUI starts (i.e., it runs at the same time CheckDisk runs at boot).

What I already know:

1. This might require not-very-well-documented functions. That's fine with me.

2. I already know how to compile native NT executables, so feel free to omit that from responses.

Questions:

1. How can you display graphics before everything has started up? (i.e. What functions/libraries do you use?)

2. How does it display formatted and aligned text on the screen?
   I know NtDisplayString is capable of writing text, but it can't draw things in a formatted manner, as you can see below. What function(s) do you use to replicate the behavior below?

Answer 1

I feel kind of silly answering my own question right now, but Ben's hints helped me figure it out:

It's using a driver, which in turn uses these functions in BootVid.dll:

VidBufferToScreenBlt
VidScreenToBufferBlt
VidBitBlt