$ Code evolution | Phillip Tennen

$ Code evolution

Tired

Each frame, draw all visible regions

fn draw_frame() {
    clear_screen();
    draw_visible_regions(background)
    for window in windows.iter() {
        draw_visible_regions(window)
    }
}

Wired

Each frame, draw only what's been dirtied since the previous frame

fn draw_frame() {
    for rect in dirtied_rects.iter() {
        draw(rect)
    }
}