From e50bbaac3af0d06984b75d5f5ef08d6c6e604ff9 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sat, 4 May 2019 07:47:00 -0600
Subject: [PATCH] graphics/twm4nx/src/cbackground.cxx:  Should set the initial
 background color immediately without waiting for a redraw.

---
 graphics/twm4nx/src/cbackground.cxx | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/graphics/twm4nx/src/cbackground.cxx b/graphics/twm4nx/src/cbackground.cxx
index 4bcf7cca8..99993618e 100644
--- a/graphics/twm4nx/src/cbackground.cxx
+++ b/graphics/twm4nx/src/cbackground.cxx
@@ -246,6 +246,25 @@ bool CBackground::createBackgroundWindow(void)
       return false;
     }
 
+  // Get the graphics port for drawing on the background window
+
+  NXWidgets::CGraphicsPort *port = control->getGraphicsPort();
+
+  // Get the size of the region to redraw (the whole display)
+
+  struct nxgl_size_s windowSize;
+  if (!m_backWindow->getSize(&windowSize))
+    {
+      twmerr("ERROR: getSize failed\n");
+      delete m_backWindow;
+      m_backWindow = (FAR NXWidgets::CBgWindow *)0;
+      return false;
+    }
+
+  // Fill the display with the background color
+
+  port->drawFilledRect(0, 0, windowSize.w, windowSize.h,
+                       CONFIG_TWM4NX_DEFAULT_BACKGROUNDCOLOR);
   return true;
 }