From 473b53fe3cd02f0aca8efd88aab34f9cd1c672ec Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Mon, 8 Jun 2026 19:09:39 +0200
Subject: [PATCH] Handle TR2 with /Default entry

It fixes #21406.
---
 src/core/evaluator.js         | 16 ++++++++++++++--
 test/pdfs/issue21406.pdf.link |  2 ++
 test/test_manifest.json       |  8 ++++++++
 3 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 test/pdfs/issue21406.pdf.link

diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 6787040ca..ca5b702b3 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -1205,9 +1205,22 @@ class PartialEvaluator {
           }
           break;
         case "TR":
+        case "TR2": {
+          // TR2 takes precedence over TR (see PDF 32000-1:2008, Table 58), so
+          // ignore TR when a TR2 entry is present in the same dictionary.
+          if (key === "TR" && gState.has("TR2")) {
+            break;
+          }
+          // For TR2 the name /Default denotes "the transfer function that was
+          // in effect at the start of the page" (PDF 32000-1:2008, Table 58).
+          // A page always starts with the identity transfer function, hence
+          // /Default (and /Identity) means "no transfer function" here, which
+          // clears any filter previously set on the display side (issue 21406).
+          // `handleTransferFunction` returns `null` for those names.
           const transferMaps = this.handleTransferFunction(value);
-          gStateObj.push([key, transferMaps]);
+          gStateObj.push(["TR", transferMaps]);
           break;
+        }
         // Only generate info log messages for the following since
         // they are unlikely to have a big impact on the rendering.
         case "OP":
@@ -1217,7 +1230,6 @@ class PartialEvaluator {
         case "BG2":
         case "UCR":
         case "UCR2":
-        case "TR2":
         case "HT":
         case "SM":
         case "SA":
diff --git a/test/pdfs/issue21406.pdf.link b/test/pdfs/issue21406.pdf.link
new file mode 100644
index 000000000..2d49528a6
--- /dev/null
+++ b/test/pdfs/issue21406.pdf.link
@@ -0,0 +1,2 @@
+https://github.com/user-attachments/files/28716910/emptyPage.pdf
+
diff --git a/test/test_manifest.json b/test/test_manifest.json
index e64216b03..f44db6344 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -14364,5 +14364,13 @@
     "md5": "702be2459f9bdbe93338ab3a584babc4",
     "rounds": 1,
     "type": "eq"
+  },
+  {
+    "id": "issue21406",
+    "file": "pdfs/issue21406.pdf",
+    "md5": "d8042e1ee1213e8b0f1f9383d218277f",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
   }
 ]