[clutter/wip/smcv/gdk-hidpi-buffer-scale] gdk: Ensure surface buffer scale is set

[Simon McVittie <smcv src gnome org>]

commit 4eaafae520c0849a581aa9a1321b808a81d8ed7c
Author: Sjoerd Simons <sjoerd luon net>
Date:   Mon Nov 7 22:52:45 2016 +0100

    gdk: Ensure surface buffer scale is set
    
    GDK will only set the buffer scale for the surfaces it creates when
    attaching an image or when using an egl window window. Neither will
    happen for native clutter applications, thus directly set the buffer
    scale from clutter in that case (so it's in sync with the rendering
    scale)
    
    Signed-off-by: Sjoerd Simons <sjoerd luon net>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769190

 clutter/gdk/clutter-stage-gdk.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/clutter/gdk/clutter-stage-gdk.c b/clutter/gdk/clutter-stage-gdk.c
index 2408b9756..ba8a2edef 100644
--- a/clutter/gdk/clutter-stage-gdk.c
+++ b/clutter/gdk/clutter-stage-gdk.c
@@ -231,7 +231,14 @@ clutter_stage_gdk_wayland_surface (ClutterStageGdk *stage_gdk)
 
   if (!stage_gdk->foreign_window ||
       gdk_window_get_window_type (stage_gdk->window) != GDK_WINDOW_CHILD)
-    return gdk_wayland_window_get_wl_surface (stage_gdk->window);
+    {
+      struct wl_surface *surface;
+
+      surface = gdk_wayland_window_get_wl_surface (stage_gdk->window);
+      wl_surface_set_buffer_scale (surface,
+                                   gdk_window_get_scale_factor (stage_gdk->window));
+      return surface;
+    }
 
   if (stage_gdk->subsurface)
     goto out;