destroy even more images when closing

src/yugecin/opsudance/core/DisplayContainer.java

@@ -17,9 +17,11 @@
  */
 package yugecin.opsudance.core;
 
+import itdelatrisu.opsu.GameData;
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.Options;
 import itdelatrisu.opsu.audio.MusicController;
+import itdelatrisu.opsu.beatmap.Beatmap;
 import itdelatrisu.opsu.ui.Fonts;
 import org.lwjgl.Sys;
 import org.lwjgl.openal.AL;
@@ -213,7 +215,9 @@ public class DisplayContainer implements ErrorDumpable, KeyListener, MouseListen
 
 	public void teardown() {
 		InternalTextureLoader.get().clear();
-		GameImage.destroyAll();
+		GameImage.destroyImages();
+		GameData.Grade.destroyImages();
+		Beatmap.destroyBackgroundImageCache();
 		Display.destroy();
 	}
 

src/yugecin/opsudance/utils/SlickUtil.java

@@ -0,0 +1,44 @@
+/*
+ * opsu!dance - fork of opsu! with cursordance auto
+ * Copyright (C) 2017 yugecin
+ *
+ * opsu!dance is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu!dance is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!dance.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package yugecin.opsudance.utils;
+
+import org.newdawn.slick.Image;
+import org.newdawn.slick.SlickException;
+
+public class SlickUtil {
+
+	public static void destroyImages(Image[] imgs) {
+		if (imgs == null) {
+			return;
+		}
+		for (Image i : imgs) {
+			destroyImage(i);
+		}
+	}
+
+	public static void destroyImage(Image image) {
+		if (image == null) {
+			return;
+		}
+		try {
+			image.destroy();
+		} catch (SlickException ignored) {
+		}
+	}
+
+}