Set TaskBar icon is available

.gitignore

@@ -46,3 +46,4 @@ lib/**/*.dylib
 lib/**/*.so
 trufflesqueak*.zip
 trufflesqueak*.jar
+/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/io/trufflesqueak-icon.png

mx.trufflesqueak/suite.py

@@ -16,6 +16,8 @@
     "version": "21.1.0",
     "trufflesqueak:dependencyMap": {
         "graalvm": "21.0.0",
+        "icon": "trufflesqueak-icon.png",
+        "icon_tag": "21.0.0.1",
         "image": "TruffleSqueakImage-21.1.0-dev.zip",
         "image_tag": "21.0.0.1",
         "jdk8": "282",

mx.trufflesqueak/utils.sh

@@ -122,6 +122,18 @@ download-asset() {
     "https://github.com/${GITHUB_SLUG}/releases/download/${git_tag}/${filename}"
 }
 
+download-trufflesqueak-icon() {
+  local target="${BASE_DIRECTORY}/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/io/trufflesqueak-icon.png"
+
+  if ls -1 ${target} 2>/dev/null; then
+    echo "[TruffleSqueak icon already downloaded]"
+    return
+  fi
+
+  download-asset "${DEP_ICON}" "${DEP_ICON_TAG}" "${target}"
+  echo "[TruffleSqueak icon downloaded successfully]"
+}
+
 download-trufflesqueak-image() {
   local target_dir="${BASE_DIRECTORY}/src/resources"
 
@@ -203,6 +215,7 @@ set-up-dependencies() {
   shallow-clone-graalvm-project https://github.com/graalvm/graaljs.git
   download-trufflesqueak-image
   download-trufflesqueak-test-image
+  download-trufflesqueak-icon
 
   if [[ "${java_version}" == "java8" ]]; then
     set-up-openjdk8-jvmci "${HOME}"

src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/io/SqueakDisplay.java

@@ -10,6 +10,7 @@
 import java.awt.Dimension;
 import java.awt.Frame;
 import java.awt.Graphics;
+import java.awt.Image;
 import java.awt.Point;
 import java.awt.Toolkit;
 import java.awt.datatransfer.Clipboard;
@@ -29,6 +30,8 @@
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
+import java.lang.reflect.Method;
+import java.net.URL;
 import java.util.ArrayDeque;
 import java.util.List;
 
@@ -56,6 +59,7 @@ public final class SqueakDisplay implements SqueakDisplayInterface {
     private static final String DEFAULT_WINDOW_TITLE = "TruffleSqueak";
     private static final Dimension MINIMUM_WINDOW_SIZE = new Dimension(200, 150);
     private static final Toolkit TOOLKIT = Toolkit.getDefaultToolkit();
+    private static final URL ICON_URL = SqueakDisplay.class.getResource("trufflesqueak-icon.png");
     @CompilationFinal(dimensions = 1) private static final int[] CURSOR_COLORS = new int[]{0x00000000, 0xFF0000FF, 0xFFFFFFFF, 0xFF000000};
 
     public final SqueakImageContext image;
@@ -72,6 +76,10 @@ public final class SqueakDisplay implements SqueakDisplayInterface {
     private Point rememberedWindowLocation;
     private boolean deferUpdates;
 
+    static {
+        tryToSetTaskbarIcon();
+    }
+
     public SqueakDisplay(final SqueakImageContext image) {
         this.image = image;
         frame.add(canvas);
@@ -83,6 +91,21 @@ public SqueakDisplay(final SqueakImageContext image) {
         installEventListeners();
     }
 
+    @TruffleBoundary
+    private static void tryToSetTaskbarIcon() {
+        // java.awt.Taskbar introduced in JDK 9, call it reflectively.
+        try {
+            final Image icon = TOOLKIT.getImage(ICON_URL);
+            final Class<?> tbClass = Class.forName("java.awt.Taskbar");
+            final Method getter = tbClass.getMethod("getTaskbar");
+            final Object tb = getter.invoke(getter);
+            final Method setter = tb.getClass().getMethod("setIconImage", Image.class);
+            setter.invoke(tb, icon);
+        } catch (final Exception e) {
+            // Ignore
+        }
+    }
+
     @SuppressWarnings("unused")
     private void installEventListeners() {
         canvas.addMouseListener(mouse);