Lowest possible level to create a window and manipulate it's pixels on Linux (Raspbian) in C

Question

I want to create a blank window in Raspbian / Raspberry Pi OS and manipulate it's pixels. Nothing more, I don't need mouse interactions, inputs, text or anything else, just a way to calculate whether a pixel at a given position is black or white. Basically I calculate big array of pixels and I want to visualize that by drawing pixels for every element of my pixel array. All I've read online so far says to use big libraries like GTK, but I don't want to use any of these.
I want to do this at the lowest possible level in C on a Raspberry Pi.
Maybe that's even possible without a complete window just in the terminal with a graphics API? Thanks