From e647ebae87950176738b382434a72749e2874bb6 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Fri, 9 Feb 2024 03:03:27 +0100
Subject: [PATCH] rendernode: Do full diff when starting/stopping offload

When a subsurface goes from not offloaded to offloaded (or vice versa),
we need to add the whole node to the diff region, because we switch from
whatever contents were drawn to a punched hole.
---
 gsk/gskrendernodeimpl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index ec91dc8f79..e4e096143e 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -6984,11 +6984,17 @@ gsk_subsurface_node_diff (GskRenderNode  *node1,
   info1 = gsk_offload_get_subsurface_info (data->offload, self1->subsurface);
   info2 = gsk_offload_get_subsurface_info (data->offload, self2->subsurface);
 
-  if (!info1 || !info2)
+  if (!info1 && !info2)
     {
       gsk_render_node_data_diff (self1->child, self2->child, data);
       return;
     }
+  else if (!info1 || !info2)
+    {
+      gsk_render_node_diff_impossible (node1, node2, data);
+      return;
+    }
+
 
   if (info1->is_offloaded != info2->is_offloaded ||
       info1->is_above != info2->is_above)