RustHELP

struct SDLContext {
    sdl: sdl2::Sdl,
    audio: sdl2::AudioSubsystem,
    window: Box<sdl2::video::Window>,
    canvas: Box<sdl2::render::WindowCanvas>,
    //texture_creator: sdl2::render::TextureCreator<sdl2::video::WindowContext>,
}

impl SDLContext {
    fn new() -> Result<SDLContext, String> {
        let sdl = sdl2::init()?;
        let audio = sdl.audio()?;

        let _image_context = sdl2::image::init(InitFlag::PNG | InitFlag::JPG)?;
        let video_subsystem = sdl.video()?;

        let window = Box::new(
            video_subsystem
                .window("Tiles", 1200, 1200)
                .position_centered()
                .build()
                .map_err(|e| e.to_string())?,
        );

        let canvas = Box::new(
            window
                .into_canvas()
                .software()
                .build()
                .map_err(|e| e.to_string())?,
        );

        //let texture_creator = canvas.texture_creator();

        let context = SDLContext {
            sdl: sdl,
            audio: audio,
            window: window,
            canvas: canvas
           // texture: 
            //   texture_creator,
        };

        Ok(context)
    }
}

fn main() -> Result<(), String> {
    let mut sdl = SDLContext::new()?;
    /*
    let mut events = sdl.sdl.event_pump()?;
    'mainloop: loop {
        for event in events.poll_iter() {
            match event {
                Event::Quit { .. } => break 'mainloop,
                _ => {}
            }
        }

        sdl.canvas.clear();
        sdl.canvas.present();

        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
    }*/

    Ok(())
}