Do not divide width/height of surface texture by two

src/event_loop.rs

@@ -55,7 +55,7 @@ pub fn run(filename: &OsStr) -> Result<()> {
         let window_size = window.inner_size();
         let scale_factor = window.scale_factor();
         let surface_texture =
-            SurfaceTexture::new(window_size.width / 2, window_size.height / 2, &window);
+            SurfaceTexture::new(window_size.width, window_size.height, &window);
         let pixels = Pixels::new(WIDTH, HEIGHT, surface_texture)?;
         let gui = Gui::new(window_size.width, window_size.height, scale_factor, &pixels);