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/*
* libopenraw - ljpegdecompressor.h
*
* Copyright (C) 2007 Hubert Figuiere
*
* 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, either version 3 of
* the License, or (at your option) any later version.
*
* 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, see
* <http://www.gnu.org/licenses/>.
*/
#ifndef __OPENRAW_LJPEGDECOMPRESSOR_H__
#define __OPENRAW_LJPEGDECOMPRESSOR_H__
#include <stdint.h>
#include <vector>
#include <libopenraw/libopenraw.h>
#include "exception.h"
#include "decompressor.h"
namespace OpenRaw {
class RawData;
namespace Internals {
struct HuffmanTable;
struct DecompressInfo;
typedef int16_t ComponentType;
typedef ComponentType *MCU;
class LJpegDecompressor
: public Decompressor
{
public:
LJpegDecompressor(IO::Stream *,
RawContainer *);
virtual ~LJpegDecompressor();
/** decompress the bitmapdata and return a new bitmap
* @param in a preallocated BitmapData instance
* or NULL if decompress has to allocate it.
* @return the new bitmap decompressed. NULL is failure.
* Caller owns it.
* @todo use a shared_ptr here, or something
*/
virtual RawData *decompress(RawData *in = NULL);
/** Set the "slices"
* @param slices the vector containing the Canon-style slices.
*
* the format of the slices vector is as follow
* N col1 col2
* N is the number of repeat for col1. The total
* number of slices is always N+1
* This is for Canon CR2.
*/
void setSlices(const std::vector<uint16_t> & slices);
bool isSliced() const
{
return m_slices.size() > 1;
}
private:
/** read the bits
* @param s the stream to read from
* @param bitCount the number of bit
* @return the value
*/
int32_t readBits(IO::Stream * s, uint16_t bitCount);
int32_t show_bits8(IO::Stream * s);
void flush_bits(uint16_t nbits);
int32_t get_bits(uint16_t nbits);
int32_t get_bit();
/**
* Enumerate all the JPEG marker codes
*/
typedef enum {
M_SOF0 = 0xc0,
M_SOF1 = 0xc1,
M_SOF2 = 0xc2,
M_SOF3 = 0xc3,
M_SOF5 = 0xc5,
M_SOF6 = 0xc6,
M_SOF7 = 0xc7,
M_JPG = 0xc8,
M_SOF9 = 0xc9,
M_SOF10 = 0xca,
M_SOF11 = 0xcb,
M_SOF13 = 0xcd,
M_SOF14 = 0xce,
M_SOF15 = 0xcf,
M_DHT = 0xc4,
M_DAC = 0xcc,
M_RST0 = 0xd0,
M_RST1 = 0xd1,
M_RST2 = 0xd2,
M_RST3 = 0xd3,
M_RST4 = 0xd4,
M_RST5 = 0xd5,
M_RST6 = 0xd6,
M_RST7 = 0xd7,
M_SOI = 0xd8,
M_EOI = 0xd9,
M_SOS = 0xda,
M_DQT = 0xdb,
M_DNL = 0xdc,
M_DRI = 0xdd,
M_DHP = 0xde,
M_EXP = 0xdf,
M_APP0 = 0xe0,
M_APP15 = 0xef,
M_JPG0 = 0xf0,
M_JPG13 = 0xfd,
M_COM = 0xfe,
M_TEM = 0x01,
M_ERROR = 0x100
} JpegMarker;
void DecoderStructInit (DecompressInfo *dcPtr) throw(DecodingException);
void HuffDecoderInit (DecompressInfo *dcPtr) throw(DecodingException);
void ProcessRestart (DecompressInfo *dcPtr) throw(DecodingException);
void DecodeFirstRow(DecompressInfo *dcPtr,
MCU *curRowBuf);
void DecodeImage(DecompressInfo *dcPtr);
int32_t QuickPredict(int32_t col, int16_t curComp,
MCU *curRowBuf, MCU *prevRowBuf,
int32_t psv);
void PmPutRow(MCU* RowBuf, int32_t numComp, int32_t numCol, int32_t Pt);
void GetDht (DecompressInfo *dcPtr) throw(DecodingException);
void GetDri (DecompressInfo *dcPtr) throw(DecodingException);
void GetSof (DecompressInfo *dcPtr) throw(DecodingException);
void GetSos (DecompressInfo *dcPtr) throw(DecodingException);
JpegMarker ProcessTables (DecompressInfo *dcPtr);
void ReadFileHeader (DecompressInfo *dcPtr) throw(DecodingException);
int32_t ReadScanHeader (DecompressInfo *dcPtr);
int32_t HuffDecode(HuffmanTable *htbl);
std::vector<uint16_t> m_slices;
MCU *m_mcuROW1, *m_mcuROW2;
char *m_buf1,*m_buf2;
/** fill the bit buffer */
void fillBitBuffer (IO::Stream * s, uint16_t nbits);
uint16_t m_bitsLeft;
uint32_t m_getBuffer;
RawData *m_output;
/** private copy constructor to make sure it is not called */
LJpegDecompressor(const LJpegDecompressor& f);
/** private = operator to make sure it is never called */
LJpegDecompressor & operator=(const LJpegDecompressor&);
};
}
}
#endif
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0))
indent-tabs-mode:nil
fill-column:80
End:
*/
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