NewFont returns a new font in which each glyph will have dimensions based on the given width and height.

NewFrameBuffer returns a new frame buffer that contains a set of logical rows and columns.

Screen is the frame buffer which tracks the state of the main emulator screen.

A Font is a bitmapped font which can represent glyphs, or renderings of a single character, as FrameBuffers that can then be blitted onto a larger FrameBuffer.

A FrameBuffer is a set of cells which contain color information.

A FrameFilter is some device which, given a specific cell, can return a filtered color.

A FrameManager is something which can manage a graphics frame, which is a two-dimensional set of rows and columns (composed of "cells") that contain color information.