From aa0c95ed7241edfd24e73eeb686b1c4241ca9764 Mon Sep 17 00:00:00 2001
From: Lee Salzman <lsalzman@mozilla.com>
Date: Thu, 31 Jul 2025 23:35:43 +0000
Subject: [PATCH] Bug 1969281 - Clear mResolvedDefaultFB on resize. r=ahale
 a=RyanVM

The size of mDefaultFB and mResolvedDefaultFB diverge on a resize if there is
an existing mResolvedDefaultFB from before the size change. Both need to be
cleared on a resize.

Differential Revision: https://phabricator.services.mozilla.com/D259489
---
 dom/canvas/WebGLContext.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dom/canvas/WebGLContext.cpp b/dom/canvas/WebGLContext.cpp
index a1fd6e763985..a5afc42959b0 100644
--- a/dom/canvas/WebGLContext.cpp
+++ b/dom/canvas/WebGLContext.cpp
@@ -514,6 +514,7 @@ void WebGLContext::Resize(uvec2 requestedSize) {
   // Kill our current default fb(s), for later lazy allocation.
   mRequestedSize = requestedSize;
   mDefaultFB = nullptr;
+  mResolvedDefaultFB = nullptr;
   mResetLayer = true;  // New size means new Layer.
 }