From 8c6f1e45c78c747b5d1f9771f162761ad83c0dbd Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Mon, 18 Oct 2021 21:40:10 +0200
Subject: [PATCH] Fix pattern handling regression in `SVGGraphics` (PR 13770
 follow-up)

While the FAQ clearly lists the SVG back-end as unsupported, see https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#backends, I suppose that small/simple regressions still makes sense to fix.
---
 src/display/svg.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/display/svg.js b/src/display/svg.js
index 15e49d9f5..c2b6f7c0d 100644
--- a/src/display/svg.js
+++ b/src/display/svg.js
@@ -1160,6 +1160,9 @@ if (
      * @private
      */
     _makeShadingPattern(args) {
+      if (typeof args === "string") {
+        args = this.objs.get(args);
+      }
       switch (args[0]) {
         case "RadialAxial":
           const shadingId = `shading${shadingCount++}`;