From ac8757f36f0e78428a89e2e68962931665c51df7 Mon Sep 17 00:00:00 2001
From: maettuu <mangori41@bluewin.ch>
Date: Sun, 20 Jul 2025 13:26:04 +0200
Subject: [PATCH] Add regression test for negative LW normalization in gs
 operator
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Ensure that negative “LW” entries in an ExtGState dictionary are converted to their absolute values when the “gs” operator is processed.

See PR https://github.com/mozilla/pdf.js/pull/19639
---
 test/unit/evaluator_spec.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/test/unit/evaluator_spec.js b/test/unit/evaluator_spec.js
index 0aa6bc685..643a965f0 100644
--- a/test/unit/evaluator_spec.js
+++ b/test/unit/evaluator_spec.js
@@ -423,4 +423,30 @@ describe("evaluator", function () {
       expect(operatorList.length).toEqual(0);
     });
   });
+
+  describe("graphics-state operators", function () {
+    it("should convert negative line width to absolute value in the graphic state", async function () {
+      const gState = new Dict();
+      gState.set("LW", -5);
+      const extGState = new Dict();
+      extGState.set("GSneg", gState);
+
+      const resources = new ResourcesMock();
+      resources.ExtGState = extGState;
+
+      const stream = new StringStream("/GSneg gs");
+      const result = await runOperatorListCheck(
+        partialEvaluator,
+        stream,
+        resources
+      );
+
+      expect(result.fnArray).toEqual([OPS.setGState]);
+
+      const stateEntries = result.argsArray[0][0];
+      const lwEntry = stateEntries.find(([key]) => key === "LW");
+      expect(lwEntry).toBeDefined();
+      expect(lwEntry[1]).toEqual(5);
+    });
+  });
 });