1 files changed, 2 insertions, 0 deletions
diff --git a/FL/Fl_Device.H b/FL/Fl_Device.H
index 93b3836a9..757aa6581 100644
--- a/FL/Fl_Device.H
+++ b/FL/Fl_Device.H
@@ -28,6 +28,7 @@
 class Fl_Graphics_Driver;
 class Fl_RGB_Image;
 class Fl_Widget;
+class Fl_Image_Surface;
 
 /**
  A drawing surface that's susceptible to receive graphical output.
@@ -91,6 +92,7 @@ public:
   }
   /** \brief The destructor. */
   virtual ~Fl_Surface_Device();
+  virtual Fl_Image_Surface *as_image_surface();
   static void push_current(Fl_Surface_Device *new_current);
   static Fl_Surface_Device *pop_current();
 };