[gtk+/wip/otte/gl-drawing: 3/15] window: Change behavior of gdk_window_begin_draw_frame()

[Benjamin Otte <otte src gnome org>]

commit b3539d713b20e47644590d9e4089cba196559876
Author: Benjamin Otte <otte redhat com>
Date:   Sun Nov 20 20:42:37 2016 +0100

    window: Change behavior of gdk_window_begin_draw_frame()
    
    (1) Require a native window
    (2) Create the drawing context before calling begin_paint().

 gdk/gdkwindow.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index ee93ade..2741d9c 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -2894,6 +2894,8 @@ gdk_window_begin_draw_frame (GdkWindow            *window,
   GdkDrawingContext *context;
 
   g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
+  g_return_val_if_fail (gdk_window_has_native (window), NULL);
+  g_return_val_if_fail (gdk_window_is_toplevel (window), NULL);
 
   if (window->drawing_context != NULL)
     {
@@ -2903,14 +2905,13 @@ gdk_window_begin_draw_frame (GdkWindow            *window,
       return NULL;
     }
 
-  if (gdk_window_has_native (window) && gdk_window_is_toplevel (window))
-    gdk_window_begin_paint_internal (window, region);
-
   context = GDK_WINDOW_IMPL_GET_CLASS (window->impl)->create_draw_context (window, region);
 
   /* Do not take a reference, to avoid creating cycles */
   window->drawing_context = context;
 
+  gdk_window_begin_paint_internal (window, region);
+
   return context;
 }