[gtk/matthiasc/surface-state-rework: 29/80] gdk/surface: Make backends aware of when layout is requested

[Matthias Clasen <matthiasc src gnome org>]

commit 12598cec5a281366fcbc36debf9823671d3239bb
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Dec 2 09:12:01 2020 +0100

    gdk/surface: Make backends aware of when layout is requested

 gdk/gdksurface.c        | 5 +++++
 gdk/gdksurfaceprivate.h | 1 +
 2 files changed, 6 insertions(+)
---
diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index 9f6bb03e24..a8f93170ec 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -1378,8 +1378,13 @@ gdk_surface_layout_on_clock (GdkFrameClock *clock,
 void
 gdk_surface_request_layout (GdkSurface *surface)
 {
+  GdkSurfaceClass *class;
   GdkFrameClock *frame_clock;
 
+  class = GDK_SURFACE_GET_CLASS (surface);
+  if (class->request_layout)
+    class->request_layout (surface);
+
   if (surface->update_freeze_count ||
       gdk_surface_is_toplevel_frozen (surface))
     {
diff --git a/gdk/gdksurfaceprivate.h b/gdk/gdksurfaceprivate.h
index cc4e1a1a35..6a4a820faa 100644
--- a/gdk/gdksurfaceprivate.h
+++ b/gdk/gdksurfaceprivate.h
@@ -170,6 +170,7 @@ struct _GdkSurfaceClass
                                            gboolean        attached,
                                            GdkGLContext   *share,
                                            GError        **error);
+  void         (* request_layout)         (GdkSurface     *surface);
   void         (* compute_size)           (GdkSurface     *surface);
 };