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diff --git a/linden/indra/llimage/llimagedxt.h b/linden/indra/llimage/llimagedxt.h
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+++ b/linden/indra/llimage/llimagedxt.h
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+/** 
+ * @file llimagedxt.h
+ *
+ * Copyright (c) 2001-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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 LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLIMAGEDXT_H
+#define LL_LLIMAGEDXT_H
+
+#include "llimage.h"
+
+// This class decodes and encodes LL DXT files (which may unclude uncompressed RGB or RGBA mipped data)
+
+class LLImageDXT : public LLImageFormatted
+{
+public:
+        enum EFileFormat
+        { 
+                FORMAT_UNKNOWN = 0,
+                FORMAT_I8 = 1,
+                FORMAT_A8,
+                FORMAT_RGB8,
+                FORMAT_RGBA8,
+                FORMAT_DXT1,
+                FORMAT_DXT2,
+                FORMAT_DXT3,
+                FORMAT_DXT4,
+                FORMAT_DXT5,
+                FORMAT_DXR1,
+                FORMAT_DXR2,
+                FORMAT_DXR3,
+                FORMAT_DXR4,
+                FORMAT_DXR5,
+                FORMAT_NOFILE = 0xff,
+        };
+        
+        struct dxtfile_header_old_t
+        {
+                S32 format;
+                S32 maxlevel;
+                S32 maxwidth;
+                S32 maxheight;
+        };
+
+        struct dxtfile_header_t
+        {
+                S32 fourcc;
+                // begin DDSURFACEDESC2 struct
+                S32 header_size; // size of the header
+                S32 flags; // flags - unused
+                S32 maxheight;
+                S32 maxwidth;
+                S32 image_size; // size of the compressed image
+                S32 depth;
+                S32 num_mips;
+                S32 reserved[11];
+                struct pixel_format
+                {
+                        S32 struct_size; // size of this structure
+                        S32 flags;
+                        S32 fourcc;
+                        S32 bit_count;
+                        S32 r_mask;
+                        S32 g_mask;
+                        S32 b_mask;
+                        S32 a_mask;
+                } pixel_fmt;
+                S32 caps[4];
+                S32 reserved2;
+        };
+
+protected:
+        /*virtual*/ ~LLImageDXT();
+        
+public:
+        LLImageDXT();
+
+        /*virtual*/ BOOL updateData();
+
+        /*virtual*/ BOOL decode(LLImageRaw* raw_image, F32 time=0.0);
+                                BOOL encode(const LLImageRaw* raw_image, F32 time, bool explicit_mips);
+        /*virtual*/ BOOL encode(const LLImageRaw* raw_image, F32 time=0.0);
+
+        /*virtual*/ BOOL requestDecodedData(LLPointer<LLImageRaw>& raw, S32 discard=-1, F32 decode_time=0.0);
+        /*virtual*/ void releaseDecodedData();
+        
+        /*virtual*/ S32 calcHeaderSize();
+        /*virtual*/ S32 calcDataSize(S32 discard_level = 0);
+
+        void setFormat();
+        S32 getMipOffset(S32 discard);
+        
+        EFileFormat getFileFormat() { return mFileFormat; }
+        bool isCompressed() { return (mFileFormat >= FORMAT_DXT1 && mFileFormat <= FORMAT_DXR5); }
+
+        bool convertToDXR(); // convert from DXT to DXR
+        
+        static void checkMinWidthHeight(EFileFormat format, S32& width, S32& height);
+        static S32 formatBits(EFileFormat format);
+        static S32 formatBytes(EFileFormat format, S32 width, S32 height);
+        static S32 formatOffset(EFileFormat format, S32 width, S32 height, S32 max_width, S32 max_height);
+        static S32 formatComponents(EFileFormat format);
+        
+        static EFileFormat getFormat(S32 fourcc);
+        static S32 getFourCC(EFileFormat format);
+
+        static void calcDiscardWidthHeight(S32 discard_level, EFileFormat format, S32& width, S32& height);
+        static S32 calcNumMips(S32 width, S32 height);
+
+private:
+        static void extractMip(const U8 *indata, U8* mipdata, int width, int height,
+                                                   int mip_width, int mip_height, EFileFormat format);
+        
+private:
+        EFileFormat mFileFormat;
+        S32 mHeaderSize;
+};
+
+#endif