/** 
 * @file llimagebmp.h
 * @brief Image implementation for BMP.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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_LLIMAGEBMP_H
#define LL_LLIMAGEBMP_H

#include "llimage.h"

// This class compresses and decompressed BMP files

class LLImageBMP : public LLImageFormatted
{
protected:
	virtual ~LLImageBMP();
	
public:
	LLImageBMP();

	/*virtual*/ std::string getExtension() { return std::string("bmp"); }
	/*virtual*/ bool updateData();
	/*virtual*/ bool decode(LLImageRaw* raw_image, F32 decode_time);
	/*virtual*/ bool encode(const LLImageRaw* raw_image, F32 encode_time);

protected:
	bool		decodeColorTable8( U8* dst, U8* src );
	bool		decodeColorMask16( U8* dst, U8* src );
	bool		decodeTruecolor24( U8* dst, U8* src );
	bool		decodeColorMask32( U8* dst, U8* src );

	U32			countTrailingZeros( U32 m );

protected:
	S32			mColorPaletteColors;
	U8*			mColorPalette;
	S32			mBitmapOffset;
	S32			mBitsPerPixel;
	U32			mBitfieldMask[4]; // rgba
	bool		mOriginAtTop;
};

#endif
