Quality of Life changes to the viewer

changed:
/ SwingIFrame ; Some new methodes for setting bg color, and fullscreen, keybinds are "F11" and "B"
/ WebcamCaptureLoop.java ; Safety is key!

---
rattatwinko

src/main/java/io/swtc/proccessing/WebcamCaptureLoop.java

@@ -5,13 +5,15 @@ import com.github.sarxos.webcam.WebcamException;
 
 import java.awt.Dimension;
 import java.awt.image.BufferedImage;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Consumer;
-import javax.swing.JOptionPane;
+import javax.swing.*;
 
 public class WebcamCaptureLoop {
     private final Webcam webcam;
     private final Consumer<BufferedImage> onFrameCaptured;
     private volatile boolean running = false;
+    private final AtomicBoolean cleanedUp = new AtomicBoolean(false);
 
     public WebcamCaptureLoop(Webcam webcam, Consumer<BufferedImage> onFrameCaptured) {
         this.webcam = webcam;
@@ -64,22 +66,40 @@ public class WebcamCaptureLoop {
         captureThread.start();
     }
 
-    // method for cleaning up
+    /**
+     * Safely release webcam
+     */
     private synchronized void cleanup() {
+        if (!cleanedUp.compareAndSet(false, true)) {
+            return;
+        }
+
+        boolean success = false;
+
         try {
-            // if the camera is open try to cloes it!
-            webcam.close();
+            if (webcam.isOpen())
+                webcam.close();
+
+            success = true;
+
         } catch (WebcamException exception) {
+            SwingUtilities.invokeLater(() ->
             JOptionPane.showMessageDialog(
                     null,
                     "Cleanup failed \nWebCamException@"+exception.getMessage(),
                     "WebCamException",
-                    JOptionPane.ERROR_MESSAGE
-            );
+                    JOptionPane.WARNING_MESSAGE // changed to warning, its better tbh
+            ));
+        } finally {
+            if (!success)
+                cleanedUp.set(false);
         }
-
     }
 
+    /**
+     * Arguments: null (or just none)
+     * What does this method do? : Sets CameraThreads running flag to false and calls cleanup();
+     */
     public void stop() {
         running = false;
         cleanup();