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/**
* @file llimagejpeg.h
* @brief This class compresses and decompresses JPEG files
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* 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_LLIMAGEJPEG_H
#define LL_LLIMAGEJPEG_H
#include <csetjmp>
#include "llimage.h"
extern "C" {
#ifdef LL_USESYSTEMLIBS
# 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);
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
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