[gtk+] X11: Fix crash in gdk_x11_gl_context_texture_from_surface

[Alexander Larsson <alexl src gnome org>]

commit 142368f0954e01f60aadb4ba620488fe83ccb68a
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Oct 16 12:58:43 2014 +0200

    X11: Fix crash in gdk_x11_gl_context_texture_from_surface
    
    We need to look at the impl_window for the gl rendering, not
    the subwindow we're rendering into.

 gdk/x11/gdkglcontext-x11.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkglcontext-x11.c b/gdk/x11/gdkglcontext-x11.c
index 1464d9a..3377f69 100644
--- a/gdk/x11/gdkglcontext-x11.c
+++ b/gdk/x11/gdkglcontext-x11.c
@@ -368,7 +368,7 @@ gdk_x11_gl_context_texture_from_surface (GdkGLContext *context,
   if (glx_pixmap == NULL)
     return FALSE;
 
-  window = gdk_gl_context_get_window (gdk_gl_context_get_current ());
+  window = gdk_gl_context_get_window (gdk_gl_context_get_current ())->impl_window;
   window_scale = gdk_window_get_scale_factor (window);
   window_height = gdk_window_get_height (window);