add update_nb function

Author: SakiiCode

CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Added
 
 - **(breaking)** [#71](https://github.com/embedded-graphics/simulator/pull/71) Added support for non-square pixels.
+- [#72](https://github.com/embedded-graphics/simulator/pull/72) Added non-blocking `Window::update_nb` function.
 
 ### Fixed
 

src/window/mod.rs

@@ -75,8 +75,8 @@ impl Window {
         }
     }
 
-    /// Updates the window.
-    pub fn update<C>(&mut self, display: &SimulatorDisplay<C>)
+    /// Updates the window and returns
+    pub fn update_nb<C>(&mut self, display: &SimulatorDisplay<C>)
     where
         C: PixelColor + Into<Rgb888> + From<Rgb888>,
     {
@@ -164,7 +164,14 @@ impl Window {
             framebuffer.draw_display(display, Point::zero(), &self.output_settings);
             sdl_window.update(framebuffer);
         }
+    }
 
+    /// Updates the window and blocks until the next frame
+    pub fn update<C>(&mut self, display: &SimulatorDisplay<C>)
+    where
+        C: PixelColor + Into<Rgb888> + From<Rgb888>,
+    {
+        self.update_nb(display);
         self.fps_limiter.sleep();
     }