Added an interface class for Surface object... like NESBank will become.

app/js/ifaces/Surface.js

+import Utils from "/app/js/common/Utils.js"
+
+
+export default class ISurface{
+  constructor(){
+    this.__default_pi = [
+      "#080808",
+      "#343434",
+      "#a2a2a2",
+      "#efefef",
+      "#666666" // Out of bounds color.
+    ];
+  }
+
+  get width(){return 0;}
+  get height(){return 0;}
+  get length(){return 0;}
+
+  get coloridx(){
+    return new Proxy(this, {
+      get: function(obj, prop){
+        if (prop === "length")
+          return 0;
+        if (!Utils.isInt(prop))
+          throw new TypeError("Expected integer index.");
+        if (prop < 0)
+          throw new RangeError("Index is out of bounds.");
+        return obj.__default_pi[4];
+      }
+
+      set: function(obj, prop, value){
+        if (!Utils.isInt(prop))
+          throw new TypeError("Expected integer index.");
+        if (prop < 0)
+          throw new RangeError("Index out of bounds.");
+        if (!Utils.isInt(value))
+          throw new TypeError("Color index expected to be an integer.");
+        if (value < 0 || value >= 4)
+          throw new RangeError("Color index is out of bounds.");
+        return true;
+      }
+    });
+  }
+
+  copy(b){return this;}
+  clone(){return new ISurface();}
+
+  getColor(x, y){
+    return this.__default_pi[4];
+  }
+
+  setColorIndex(x, y, ci, pi){
+    return this;
+  }
+
+
+}