From fbe000734a9d5d03f4a21fd6a81614208f86a46d Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Mon, 15 Apr 2024 11:11:39 -0400
Subject: [PATCH] wayland: Refuse offloading when we can't

If we have a subsurface with background, but no single-pixel
buffer support, refuse to offload.
---
 gdk/wayland/gdksubsurface-wayland.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gdk/wayland/gdksubsurface-wayland.c b/gdk/wayland/gdksubsurface-wayland.c
index 1cf5fa4cf1..eaf5b72e8b 100644
--- a/gdk/wayland/gdksubsurface-wayland.c
+++ b/gdk/wayland/gdksubsurface-wayland.c
@@ -311,6 +311,7 @@ gdk_wayland_subsurface_attach (GdkSubsurface         *sub,
 {
   GdkWaylandSubsurface *self = GDK_WAYLAND_SUBSURFACE (sub);
   GdkWaylandSurface *parent = GDK_WAYLAND_SURFACE (sub->parent);
+  GdkWaylandDisplay *display = GDK_WAYLAND_DISPLAY (gdk_surface_get_display (sub->parent));
   struct wl_buffer *buffer = NULL;
   gboolean result = FALSE;
   GdkWaylandSubsurface *sib = sibling ? GDK_WAYLAND_SUBSURFACE (sibling) : NULL;
@@ -457,6 +458,12 @@ gdk_wayland_subsurface_attach (GdkSubsurface         *sub,
                          gdk_texture_get_height (texture),
                          self);
     }
+  else if (has_background && !display->single_pixel_buffer)
+    {
+      GDK_DISPLAY_DEBUG (gdk_surface_get_display (sub->parent), OFFLOAD,
+                         "Cannot offload subsurface %p with background, no single-pixel buffer support",
+                         self);
+    }
   else
     {
       gboolean was_transparent;