From e45ea70936ee30344b96ab99c7651fef58ebd4ff Mon Sep 17 00:00:00 2001
From: Manuel Bachmann <tarnyko@tarnyko.net>
Date: Wed, 27 Nov 2013 11:14:16 +0100
Subject: [PATCH] Fix CSD check for Win32

Win32 does not have alpha channel currently ; fix the check
for this, so trying to enable CSDs on this platform will
not "succeed" and crash the app anymore.

Partially fixes gtk3-widget-factory.
---
 gtk/gtkwindow.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 056260f337..29c3fccac7 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -61,6 +61,10 @@
 #include "x11/gdkx.h"
 #endif
 
+#ifdef GDK_WINDOWING_WIN32
+#include "win32/gdkwin32.h"
+#endif
+
 #ifdef GDK_WINDOWING_WAYLAND
 #include "wayland/gdkwayland.h"
 #endif
@@ -3507,6 +3511,21 @@ gdk_window_supports_csd (GtkWindow *window)
     }
 #endif
 
+#ifdef GDK_WINDOWING_WIN32
+  if (GDK_IS_WIN32_DISPLAY (gtk_widget_get_display (widget)))
+    {
+      GdkScreen *screen;
+      GdkVisual *visual;
+
+      screen = gtk_widget_get_screen (widget);
+
+      /* We need a visual with alpha */
+      visual = gdk_screen_get_rgba_visual (screen);
+      if (!visual)
+        return FALSE;
+    }
+#endif
+
   return TRUE;
 }