Add a getRawValues method, to Dict instances, to provide an easier way of getting all *raw* values

When the old `Dict.getAll()` method was removed, it was replaced with a `Dict.getKeys()` call and `Dict.get(...)` calls (in a loop).
While this pattern obviously makes a lot of sense in many cases, there's some instances where we actually want the *raw* `Dict` values (i.e. `Ref`s where applicable). In those cases, `Dict.getRaw(...)` calls are instead used within the loop. However, by introducing a new `Dict.getRawValues()` method we can reduce the number of (strictly unnecessary) function calls by simply getting the *raw* `Dict` values directly.

src/core/evaluator.js

@@ -254,8 +254,7 @@ class PartialEvaluator {
       // First check the current resources for blend modes.
       var graphicStates = node.get("ExtGState");
       if (graphicStates instanceof Dict) {
-        for (const key of graphicStates.getKeys()) {
-          let graphicState = graphicStates.getRaw(key);
+        for (let graphicState of graphicStates.getRawValues()) {
           if (graphicState instanceof Ref) {
             if (processed.has(graphicState)) {
               continue; // The ExtGState has already been processed.
@@ -301,8 +300,7 @@ class PartialEvaluator {
       if (!(xObjects instanceof Dict)) {
         continue;
       }
-      for (const key of xObjects.getKeys()) {
-        var xObject = xObjects.getRaw(key);
+      for (let xObject of xObjects.getRawValues()) {
         if (xObject instanceof Ref) {
           if (processed.has(xObject)) {
             // The XObject has already been processed, and by avoiding a
@@ -3078,9 +3076,7 @@ class PartialEvaluator {
       } else if (isRef(encoding)) {
         hash.update(encoding.toString());
       } else if (isDict(encoding)) {
-        var keys = encoding.getKeys();
-        for (var i = 0, ii = keys.length; i < ii; i++) {
-          var entry = encoding.getRaw(keys[i]);
+        for (const entry of encoding.getRawValues()) {
           if (isName(entry)) {
             hash.update(entry.name);
           } else if (isRef(entry)) {

src/core/obj.js

@@ -2207,16 +2207,13 @@ const ObjectLoader = (function () {
   function addChildren(node, nodesToVisit) {
     if (node instanceof Dict || isStream(node)) {
       const dict = node instanceof Dict ? node : node.dict;
-      const dictKeys = dict.getKeys();
-      for (let i = 0, ii = dictKeys.length; i < ii; i++) {
-        const rawValue = dict.getRaw(dictKeys[i]);
+      for (const rawValue of dict.getRawValues()) {
         if (mayHaveChildren(rawValue)) {
           nodesToVisit.push(rawValue);
         }
       }
     } else if (Array.isArray(node)) {
-      for (let i = 0, ii = node.length; i < ii; i++) {
-        const value = node[i];
+      for (const value of node) {
         if (mayHaveChildren(value)) {
           nodesToVisit.push(value);
         }

src/core/primitives.js

@@ -144,6 +144,11 @@ var Dict = (function DictClosure() {
       return Object.keys(this._map);
     },
 
+    // no dereferencing
+    getRawValues: function Dict_getRawValues() {
+      return Object.values(this._map);
+    },
+
     set: function Dict_set(key, value) {
       if (
         (typeof PDFJSDev === "undefined" ||