set frame icon images for Java2D (dock and cmd-tab)

core/src/processing/core/PSurfaceAWT.java

@@ -988,6 +988,12 @@ public class PSurfaceAWT extends PSurfaceNone {
         frame.setIconImages(iconImages);
 
       } catch (Exception e) { }  // harmless; keep this to ourselves
+
+    } else {
+      // On OS X, set this for AWT surfaces, which handles the dock image
+      // as well as the cmd-tab image that's shown. Just one size, I guess.
+      URL url = PApplet.class.getResource("/icon/icon-512.png");
+      ThinkDifferent.setIconImage(Toolkit.getDefaultToolkit().getImage(url));
     }
   }
 

core/src/processing/core/ThinkDifferent.java

@@ -22,6 +22,8 @@
 
 package processing.core;
 
+import java.awt.Image;
+
 import com.apple.eawt.AppEvent.QuitEvent;
 import com.apple.eawt.Application;
 import com.apple.eawt.QuitHandler;
@@ -118,4 +120,9 @@ public class ThinkDifferent {
     }
     */
   }
+
+
+  static void setIconImage(Image image) {
+    application.setDockIconImage(image);
+  }
 }