From 4b6c6f043d880c730c9ba056b3e8a7cfece25a50 Mon Sep 17 00:00:00 2001
From: Jonathan Moore Liles <j.liles@unix.net>
Date: Fri, 9 Nov 2012 02:55:37 -0800
Subject: [PATCH] Allow for drawing into the overlay window with alpha.

---
 src/Fl_Double_Window.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Fl_Double_Window.cxx b/src/Fl_Double_Window.cxx
index 251de49..27103e2 100644
--- a/src/Fl_Double_Window.cxx
+++ b/src/Fl_Double_Window.cxx
@@ -393,6 +393,7 @@ void Fl_Double_Window::flush(int eraseoverlay) {
   /* cairo_rectangle( myi->cc, 0, 0, w(), h() ); */
   /* cairo_fill( myi->cc ); */
   cairo_paint( myi->cc );
+  cairo_set_operator( myi->cc, CAIRO_OPERATOR_OVER );
 #else
   int X,Y,W,H; fl_clip_box(0,0,w(),h(),X,Y,W,H);
   if (myi->other_xid) fl_copy_offscreen(X, Y, W, H, myi->other_xid, X, Y);
-- 
2.11.4.GIT