From 67177c67220d016f4d1961d4ee85085e6df797b1 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Sat, 24 Sep 2022 23:47:50 +0800
Subject: [PATCH] backout bug1767365 part from rev 591552c5 as it cause crash
 in viewing https://www.ventusky.com/?w=off

---
 dom/canvas/CanvasRenderingContext2D.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dom/canvas/CanvasRenderingContext2D.cpp b/dom/canvas/CanvasRenderingContext2D.cpp
index ec19d8385f..c17d3a3999 100644
--- a/dom/canvas/CanvasRenderingContext2D.cpp
+++ b/dom/canvas/CanvasRenderingContext2D.cpp
@@ -6075,8 +6075,8 @@ CanvasRenderingContext2D::PutImageData_explicit(int32_t aX, int32_t aY, uint32_t
     return NS_ERROR_FAILURE;
   }
 
-  uint32_t copyX = dirtyRect.x;
-  uint32_t copyY = dirtyRect.y;
+  uint32_t copyX = dirtyRect.x - aX;
+  uint32_t copyY = dirtyRect.y - aY;
   //uint8_t *src = aArray->Data();
   uint8_t *dst = imgsurf->Data();
   uint8_t* srcLine = aArray->Data() + copyY * (aW * 4) + copyX * 4;