Function draw 

pub fn draw(
    protocol: Protocol,
    bytes: &[u8],
    name: &str,
    columns: usize,
) -> String

The escape sequence that draws these bytes, ready to write to stdout.

columns bounds the width in cells. Both protocols scale to fit and keep the aspect ratio, which matters more than it sounds: a screenshot is commonly two thousand pixels wide, and drawn at its natural size it takes the whole window and several screens of scrollback with it.