From c7bdf5b508bd0dbfb48eaf23ce9feb6fdebb8380 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sat, 21 Feb 2026 12:00:19 +0100
Subject: [PATCH 1/2] Use `Map.prototype.getOrInsertComputed()` in the
 `ensureDebugMetadata` helper

Also, shorten the function by using optional chaining.
---
 src/display/canvas_dependency_tracker.js | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/src/display/canvas_dependency_tracker.js b/src/display/canvas_dependency_tracker.js
index 0d391c406..a8cc33505 100644
--- a/src/display/canvas_dependency_tracker.js
+++ b/src/display/canvas_dependency_tracker.js
@@ -50,17 +50,11 @@ class BBoxReader {
   }
 }
 
-const ensureDebugMetadata = (map, key) => {
-  if (!map) {
-    return undefined;
-  }
-  let value = map.get(key);
-  if (!value) {
-    value = { dependencies: new Set(), isRenderingOperation: false };
-    map.set(key, value);
-  }
-  return value;
-};
+const ensureDebugMetadata = (map, key) =>
+  map?.getOrInsertComputed(key, () => ({
+    dependencies: new Set(),
+    isRenderingOperation: false,
+  }));
 
 /**
  * @typedef {"lineWidth" | "lineCap" | "lineJoin" | "miterLimit" | "dash" |

From 0d8bc689b9ab354f719589fbafd39ceeed472464 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sat, 21 Feb 2026 13:26:20 +0100
Subject: [PATCH 2/2] Add missing license header in
 `src/display/canvas_dependency_tracker.js`

---
 src/display/canvas_dependency_tracker.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/display/canvas_dependency_tracker.js b/src/display/canvas_dependency_tracker.js
index a8cc33505..40c93417b 100644
--- a/src/display/canvas_dependency_tracker.js
+++ b/src/display/canvas_dependency_tracker.js
@@ -1,3 +1,18 @@
+/* Copyright 2025 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import { Util } from "../shared/util.js";
 
 const FORCED_DEPENDENCY_LABEL = "__forcedDependency";