it is done

core/src/mindustry/ui/Cicon.java

@@ -0,0 +1,23 @@
+package mindustry.ui;
+
+import java.util.*;
+
+/** Defines sizes of a content's preview icon. */
+public enum Cicon{
+    /** Full size. */
+    full(0),
+    tiny(8 * 2),
+    small(8 * 3),
+    medium(8 * 4),
+    large(8 * 5),
+    xlarge(8 * 6);
+
+    public static final Cicon[] all = values();
+    public static final Cicon[] scaled = Arrays.copyOfRange(all, 1, all.length);
+
+    public final int size;
+
+    Cicon(int size){
+        this.size = size;
+    }
+}