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diff --git a/nx-X11/programs/Xserver/hw/nxagent/Visual.h b/nx-X11/programs/Xserver/hw/nxagent/Visual.h
new file mode 100644
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+++ b/nx-X11/programs/Xserver/hw/nxagent/Visual.h
@@ -0,0 +1,73 @@
+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2011 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NXAGENT, NX protocol compression and NX extensions to this software    */
+/* are copyright of NoMachine. Redistribution and use of the present      */
+/* software is allowed according to terms specified in the file LICENSE   */
+/* which comes in the source distribution.                                */
+/*                                                                        */
+/* Check http://www.nomachine.com/licensing.html for applicability.       */
+/*                                                                        */
+/* NX and NoMachine are trademarks of Medialogic S.p.A.                   */
+/*                                                                        */
+/* All rights reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+/*
+
+Copyright 1993 by Davor Matic
+
+Permission to use, copy, modify, distribute, and sell this software
+and its documentation for any purpose is hereby granted without fee,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation.  Davor Matic makes no representations about
+the suitability of this software for any purpose.  It is provided "as
+is" without express or implied warranty.
+
+*/
+
+#ifndef __Visual_H__
+#define __Visual_H__
+
+Visual *nxagentVisual(VisualPtr pVisual);
+Visual *nxagentVisualFromID(ScreenPtr pScreen, VisualID visual);
+Visual *nxagentVisualFromDepth(ScreenPtr pScreen, int depth);
+
+Colormap nxagentDefaultVisualColormap(Visual *visual);
+
+#define nxagentDefaultVisual(pScreen) \
+    nxagentVisualFromID((pScreen), (pScreen) -> rootVisual)
+
+/*
+ * Visual generated by Xorg and Xfree86 at
+ * 16-bit depth differs on the bits_per_rgb
+ * value, so we avoid checking it.
+ */
+
+/*
+ * Some Solaris X servers uses the color
+ * masks inverted, so that the red and
+ * the blue mask are switched. To reconnect
+ * the session on this displays, we do a
+ * double check, as workaround.
+ */
+
+#define nxagentCompareVisuals(v1, v2)           \
+    ((v1).depth         == (v2).depth &&        \
+     /*(v1).bits_per_rgb  == (v2).bits_per_rgb &&*/ \
+     (v1).class         == (v2).class &&        \
+     ((v1).red_mask      == (v2).red_mask ||    \
+      (v1).red_mask      == (v2).blue_mask) &&  \
+     (v1).green_mask    == (v2).green_mask &&   \
+     ((v1).blue_mask     == (v2).blue_mask ||   \
+      (v1).blue_mask     == (v2).red_mask) &&   \
+     (v1).colormap_size == (v2).colormap_size)
+
+Visual nxagentAlphaVisual;
+
+void nxagentInitAlphaVisual();
+
+#endif /* __Visual_H__ */