From 3e4caf2e13be802797f3a6a180f16102914d5060 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 13 Nov 2022 16:15:30 +0100
Subject: [PATCH] Take the mask-offset into account when rendering repeated
 image masks (bug 1799927)

*Please note:* As usual when I'm working with the `src/display/canvas.js` code I don't really know what I'm doing, but it at least *appears* to work.
---
 src/display/canvas.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/display/canvas.js b/src/display/canvas.js
index 278be8388..61db15ef1 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -2902,7 +2902,14 @@ class CanvasGraphics {
     ctx.transform(scaleX, skewX, skewY, scaleY, 0, 0);
     const mask = this._createMaskCanvas(img);
 
-    ctx.setTransform(1, 0, 0, 1, 0, 0);
+    ctx.setTransform(
+      1,
+      0,
+      0,
+      1,
+      mask.offsetX - currentTransform[4],
+      mask.offsetY - currentTransform[5]
+    );
     for (let i = 0, ii = positions.length; i < ii; i += 2) {
       const trans = Util.transform(currentTransform, [
         scaleX,