Add icons and set them on the Window

src/main/java/net/minecraftforge/installer/Images.java

@@ -0,0 +1,41 @@
+package net.minecraftforge.installer;
+
+import javax.imageio.ImageIO;
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+final class Images {
+    private Images() {
+    }
+
+    static List<Image> getWindowIcons() {
+        List<Image> result = new ArrayList<>();
+        result.add(getImage("/icons/neoforged_background_16x16.png"));
+        result.add(getImage("/icons/neoforged_background_32x32.png"));
+        result.add(getImage("/icons/neoforged_background_128x128.png"));
+        return result;
+    }
+
+    static BufferedImage getImage(String path) {
+        return getImage(path, null);
+    }
+
+    static BufferedImage getImage(String path, String default_) {
+        try {
+            InputStream in = SimpleInstaller.class.getResourceAsStream(path);
+            if (in == null && default_ != null)
+                in = new ByteArrayInputStream(InstallerPanel.hexToByteArray(default_));
+            return ImageIO.read(in);
+        } catch (IOException e) {
+            if (default_ == null)
+                throw new RuntimeException(e);
+            else
+                return new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
+        }
+    }
+}

src/main/java/net/minecraftforge/installer/InstallerPanel.java

@@ -25,7 +25,6 @@
 import net.minecraftforge.installer.json.InstallV1;
 import net.minecraftforge.installer.json.OptionalLibrary;
 
-import javax.imageio.ImageIO;
 import javax.swing.AbstractAction;
 import javax.swing.Box;
 import javax.swing.BoxLayout;
@@ -48,10 +47,8 @@
 import java.awt.Insets;
 import java.awt.event.ActionEvent;
 import java.awt.image.BufferedImage;
-import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.io.IOException;
-import java.io.InputStream;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -128,31 +125,13 @@ public static byte[] hexToByteArray(String s) {
         return data;
     }
 
-    private BufferedImage getImage(String path, String default_)
-    {
-        try
-        {
-            InputStream in = SimpleInstaller.class.getResourceAsStream(path);
-            if (in == null && default_ != null)
-                in = new ByteArrayInputStream(hexToByteArray(default_));
-            return ImageIO.read(in);
-        }
-        catch (IOException e)
-        {
-            if (default_ == null)
-                throw new RuntimeException(e);
-            else
-                return new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
-        }
-    }
-
     public InstallerPanel(File targetDir, InstallV1 profile, File installer)
     {
         this.profile = profile;
         this.installer = installer;
 
         this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
-        BufferedImage image = getImage(profile.getLogo(), null);
+        BufferedImage image = Images.getImage(profile.getLogo());
         //final BufferedImage urlIcon = getImage(profile.getUrlIcon(), URL);
 
         JPanel logoSplash = new JPanel();
@@ -415,6 +394,7 @@ public void run(ProgressCallback monitor)
         proceedButton.ifPresent(button -> button.setText("Proceed"));
 
         dialog = optionPane.createDialog("NeoForge installer");
+        dialog.setIconImages(Images.getWindowIcons());
         dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
         dialog.setVisible(true);
         int result = (Integer) (optionPane.getValue() != null ? optionPane.getValue() : -1);

src/main/java/net/minecraftforge/installer/ProgressFrame.java

@@ -61,6 +61,7 @@ public ProgressFrame(ProgressCallback parent, String title, Runnable canceler)
         setBounds(100, 100, 600, 400);
         setContentPane(panel);
         setLocationRelativeTo(null);
+        setIconImages(Images.getWindowIcons());
 
         GridBagLayout gridBagLayout = new GridBagLayout();
         gridBagLayout.columnWidths = new int[] { 600, 0 };