LDM/compressors/SoJpegDataCompressor.h

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/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/


#ifndef SO_LDM_JPEG_COMPRESSOR_H
#define SO_LDM_JPEG_COMPRESSOR_H

#include <LDM/compressors/SoDataCompressor.h>

struct jpeg_destination_mgr;
struct jpeg_source_mgr;
struct jpeg_compress_struct;
struct jpeg_decompress_struct;
struct jpeg_error_mgr;
struct jpeg_ldm_comp_destination_mgr;
struct jpeg_ldm_decomp_destination_mgr;

class SoLibJpeg;

typedef struct jpeg_compress_struct *j_compress_ptr;
typedef struct jpeg_decompress_struct * j_decompress_ptr;

class  SoJpegDataCompressor : public SoDataCompressor
{
  SO_TYPED_CLASS_HEADER();

public:
  SoJpegDataCompressor();
 virtual ~SoJpegDataCompressor();

  virtual size_t compress(void *src, size_t srcLen, const TileInfo &tileInfo);

  virtual size_t uncompress(void *dest, size_t destLen, const TileInfo &tileInfo);

  virtual SbString getCompressionFormatName() const { return SbString("jpeg"); }

  virtual bool isLossless() { return false; }

private:
  SoLibJpeg *m_jpeg;

  struct jpeg_compress_struct *m_cinfo;
  struct jpeg_decompress_struct *m_dcinfo;

  size_t allocateNeededSpace(size_t srcLen);


  static void initDestination(j_compress_ptr cinfo);
  static unsigned char emptyOutputBuffer(j_compress_ptr cinfo);
  static void termDestination(j_compress_ptr cinfo);

  static void initSource(j_decompress_ptr cinfo);
  static unsigned char fillInputBuffer(j_decompress_ptr cinfo);
  static void skipInputData(j_decompress_ptr cinfo, long num_bytes);
  static void resyncToRestart(j_decompress_ptr cinfo, int desired);
  static void termSource(j_decompress_ptr cinfo);

  void createCompressInfo(jpeg_compress_struct *cinfo, jpeg_error_mgr *jerr,
                          jpeg_ldm_comp_destination_mgr *destMgr);
  static void createDecompressInfo(jpeg_decompress_struct *cinfo,
                                   jpeg_error_mgr *jerr,
                                   jpeg_ldm_decomp_destination_mgr *srcMgr);

  size_t compressBatch( void* src, size_t srcLen, const TileInfo& tileInfo );
  static size_t uncompressBatch( void* dest, const TileInfo& tileInfo, const unsigned char* srcBuffer, size_t srcLen );

  void allocBatchSizeBytes();
  static void writeBatchSize( unsigned char* buffer, uint64_t batchSize );
  static uint64_t readBatchSize( const unsigned char* buffer );
};

#endif

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Open Inventor Toolkit reference manual, generated on 23 Feb 2026
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