/** 
 * @file llimagejpeg.h
 * @brief This class compresses and decompresses JPEG files
 *
 * $LicenseInfo:firstyear=2002&license=viewergpl$
 * 
 * Copyright (c) 2002-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * 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://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 LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#ifndef LL_LLIMAGEJPEG_H
#define LL_LLIMAGEJPEG_H

#include <csetjmp>

#include "llimage.h"

extern "C" {
#ifdef LL_STANDALONE
# include <jpeglib.h>
# include <jerror.h>
#else
# include "jpeglib/jpeglib.h"
# include "jpeglib/jerror.h"
#endif
}

class LLImageJPEG : public LLImageFormatted
{
protected:
	virtual ~LLImageJPEG();
	
public:
	LLImageJPEG(S32 quality = 75);

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

	void			setEncodeQuality( S32 q )	{ mEncodeQuality = q; } // on a scale from 1 to 100
	S32				getEncodeQuality()			{ return mEncodeQuality; }

	// Callbacks registered with jpeglib
	static void		encodeInitDestination ( j_compress_ptr cinfo );
	static boolean	encodeEmptyOutputBuffer(j_compress_ptr cinfo);
	static void		encodeTermDestination(j_compress_ptr cinfo);

	static void		decodeInitSource(j_decompress_ptr cinfo);
	static boolean	decodeFillInputBuffer(j_decompress_ptr cinfo);
	static void		decodeSkipInputData(j_decompress_ptr cinfo, long num_bytes);
	static void		decodeTermSource(j_decompress_ptr cinfo);


	static void		errorExit(j_common_ptr cinfo);
	static void		errorEmitMessage(j_common_ptr cinfo, int msg_level);
	static void		errorOutputMessage(j_common_ptr cinfo);

	static BOOL		decompress(LLImageJPEG* imagep);

protected:
	U8*				mOutputBuffer;		// temp buffer used during encoding
	S32				mOutputBufferSize;	// bytes in mOuputBuffer

	S32				mEncodeQuality;		// on a scale from 1 to 100
private:
	static jmp_buf	sSetjmpBuffer;		// To allow the library to abort.
};

#endif  // LL_LLIMAGEJPEG_H