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diff --git a/indra/newview/lltextureatlas.h b/indra/newview/lltextureatlas.h
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+/** 
+ * @file lltextureatlas.h
+ * @brief LLTextureAtlas base class.
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+
+#ifndef LL_TEXTUREATLAS_H
+#define LL_TEXTUREATLAS_H
+
+#include "llviewertexture.h"
+class LLSpatialGroup ;
+
+class LLTextureAtlas : public LLViewerTexture
+{
+protected:
+	/*virtual*/ ~LLTextureAtlas() ;
+
+public:
+	LLTextureAtlas(U8 ncomponents, S16 atlas_dim = 16) ;	
+
+	/*virtual*/ S8 getType() const;
+
+	LLGLuint insertSubTexture(LLImageGL* source_gl_tex, S32 discard_level, const LLImageRaw* raw_image, S16 slot_col, S16 slot_row) ;
+	void releaseSlot(S16 slot_col, S16 slot_row, S8 slot_width);
+
+	BOOL getNextAvailableSlot(S8 bits_len, S16& col, S16& row) ;
+	void getTexCoordOffset(S16 col, S16 row, F32& xoffset, F32& yOffset) ;
+	void getTexCoordScale(S32 w, S32 h, F32& xscale, F32& yscale) ;
+
+	BOOL isEmpty() const ;
+	BOOL isFull(S8 to_be_reserved = 1) const ;
+	F32  getFullness() const ;
+
+	void addSpatialGroup(LLSpatialGroup* groupp) ;
+	void removeSpatialGroup(LLSpatialGroup* groupp) ;
+	LLSpatialGroup* getLastSpatialGroup() ;
+	void removeLastSpatialGroup() ;
+	BOOL hasSpatialGroup(LLSpatialGroup* groupp) ;
+	void clearSpatialGroup() ;
+	std::list<LLSpatialGroup*>* getSpatialGroupList() {return &mSpatialGroupList;}
+private:
+	void generateEmptyUsageBits() ;
+	void releaseUsageBits() ;
+
+	void markUsageBits(S8 bits_len, U8 mask, S16 col, S16 row) ;
+	void unmarkUsageBits(S8 bits_len, S16 col, S16 row) ;
+
+	void getPositionFromIndex(S16 index, S16& col, S16& row) ;
+	void getIndexFromPosition(S16 col, S16 row, S16& index) ;
+	BOOL areUsageBitsMarked(S8 bits_len, U8 mask, S16 col, S16 row) ;
+
+private:	
+	S16 mAtlasDim ; //number of slots per edge, i.e, there are "mAtlasDim * mAtlasDim" total slots in the atlas. 
+	S16 mNumSlotsReserved ;
+	S16 mMaxSlotsInAtlas ;
+	U8  **mUsageBits ;	
+	std::list<LLSpatialGroup*> mSpatialGroupList ;
+
+public:
+	//debug use only
+	U8  **mTestBits ;
+
+public:
+	static S16 sMaxSubTextureSize ;
+	static S16 sSlotSize ;
+};
+
+#endif
+