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diff --git a/linden/indra/newview/llettherebelight.h b/linden/indra/newview/llettherebelight.h
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+/**
+ * @file llettherebelight.h
+ * @brief WindlightMessage class definition.
+ *
+ * Copyright (c) 2010, Jacek Antonelli
+ *
+ * The source code in this file ("Source Code") is provided to you
+ * under the terms of the GNU General Public License, version 2.0
+ * ("GPL"). Terms of the GPL can be found in doc/GPL-license.txt in
+ * this distribution, or online at
+ * http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ *
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ *
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ *
+ * ALL SOURCE CODE IS PROVIDED "AS IS." THE AUTHOR MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+
+#ifndef LIGHTSHARE_H
+#define LIGHTSHARE_H
+
+#include <string>
+#include "llwlparamset.h"
+#include "llwaterparamset.h"
+#include "lluuid.h"
+
+struct Meta7WindlightPacket;
+
+
+typedef enum wl_scope
+{
+        WL_SCOPE_USER,
+        WL_SCOPE_REGION,
+        WL_SCOPE_PARCEL,
+        WL_SCOPE_RLV
+} WLScope;
+
+struct WLCombined
+{
+        LLWaterParamSet water;
+        LLWLParamSet sky;
+        BOOL enabled;
+};
+
+// Encapsulates a "Windlight" (LightShare) message sent from the
+// region, allowing the settings to be applied at a later time.
+//
+class LightShare
+{
+public:
+        // The meanings of the LightShareAllowed user setting.
+        enum LIGHTSHARE_ALLOWED
+        {
+                LIGHTSHARE_NEVER  = 0,
+                LIGHTSHARE_ASK    = 1,
+                LIGHTSHARE_ALWAYS = 2,
+        };
+
+        // The name of the preset where the region settings are stored.
+        static const std::string sRegionPresetName;
+        // The name of the preset where the parcel settings are stored.
+        static const std::string sParcelPresetName;
+        // The name of the preset where the RLV settings are stored.
+        static const std::string sRLVPresetName;
+
+        // Constructs a new LightShare instance from a GenericMessage
+        // with the "Windlight" method, such as those sent by a
+        // Lightshare-enabled OpenSim region.
+        LightShare( LLMessageSystem* msg );
+
+        ~LightShare();
+
+        // The name of the preset where the backup settings are stored.
+        static const std::string sBackupWaterPresetName;
+        static const std::string sBackupSkyPresetName;
+
+        // Message handler for GenericMessage with the "Windlight" method.
+        // Creates and applies a new LightShare (or prompts user).
+        static void processWindlight(LLMessageSystem* msg, void**);
+
+        static void applyMaybe(LLWaterParamSet* thisWater, LLUUID* thisVaterNormal, LLWLParamSet* thisSky);
+
+        // Called after the user has entered a new region, to reset the
+        // "ignore while in this region" state.
+        // Also resets/deactivates the Windlight settings in response to the "WindlightReset" method.
+        static void resetRegion();
+
+        // Returns true if the message contains valid Windlight settings.
+        // (But there's no real validation yet, so this is always true.)
+        bool isValid();
+
+        static void apply(LLWaterParamSet * newWater, LLUUID *newWaterNormal, LLWLParamSet *newSky, WLScope scope);
+
+private:
+        static LLTimer* sIgnoreTimer;
+        static bool sIgnoreRegion;
+
+        Meta7WindlightPacket* mPacket;
+        static LLWaterParamSet* mWater;
+        static LLWLParamSet* mSky;
+        static LLUUID* mWaterNormal;
+        bool mIsValid;
+
+        // Callback when the user interacts with the notification.
+        static bool applyCallback(const LLSD& notification, const LLSD& response);
+
+        // Converts the message's raw bytes into a Meta7WindlightPacket.
+        void process_packet( char* buf );
+
+        // Constructs a LLWaterParamSet from the Meta7WindlightPacket.
+        void process_water();
+
+        // Constructs a LLWLParamSet from the Meta7WindlightPacket.
+        void process_sky();
+
+        // Restart the timer for temporarily ignoring settings.
+        static void restartIgnoreTimer();
+
+        // Returns true if the ignore timer has expired (i.e. new settings
+        // should not be ignored anymore).
+        static bool ignoreTimerHasExpired();
+
+        static void mergeWaterSets(LLWaterParamSet* thisSet, LLWaterParamSet* oldSet);
+        static void mergeWLSets(LLWLParamSet* thisSet, LLWLParamSet* oldSet);
+};
+
+#endif