SoDataCompressor.h

/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef SO_DATA_COMPRESSOR_H
#define SO_DATA_COMPRESSOR_H
 
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning(disable:4251)
#endif
 
#include <Inventor/SoSubTypedClass.h>
#include <Inventor/sys/port.h>
#include <Inventor/SbString.h>
#include <Inventor/lists/SbStringList.h>
#include <Inventor/SbLinear.h>
#include <Inventor/SbDataType.h>
#include <Inventor/STL/vector>
 
#include <LDM/nodes/SoDataSet.h>

class  SoDataCompressor : public SoTypedObject
{
  SO_TYPED_CLASS_ABSTRACT_HEADER()
 
public:

  struct  TileInfo
  {
    TileInfo();
    TileInfo( const SbVec3i32 &dims, const SbDataType& dataType );
    TileInfo( const SbVec3i32 &dims, const SbDataType& dataType, const SbVec2d &range );

    SbVec3i32 dims;

    SoDataSet::DataType dataType;

    SbVec2d range;

    bool isRGBA;
  };

  static SoDataCompressor* getAppropriateCompressor( const SbString& name );

  static SbStringList getAvailableCompressors();

  SoDataCompressor() : m_level(0){}
  virtual ~SoDataCompressor() {}

  virtual size_t compress(void *src, size_t srcLen, const TileInfo &tileInfo) = 0;

  virtual size_t uncompress(void *dest, size_t destLen, const TileInfo &tileInfo) = 0;

  virtual SbString getCompressionFormatName() const = 0;

  virtual bool isLossless() = 0;

  virtual void setCompressionLevel(size_t level) { m_level = level; }

  virtual void *allocateCompressedBuffer(size_t size)
  {
    m_size = size;
    m_compressedBuffer.resize(size);
    if ( size>0)
      return &m_compressedBuffer[0];
    else
      return NULL;
  }

  virtual void *getCompressedBuffer() { return &m_compressedBuffer[0]; }

  static size_t crc32(const void *buf, size_t len);

  virtual size_t getCompressionLevel() { return m_level; };
 
  private:
 
  size_t getSize() { return m_size;};
  size_t m_size;
 
private:
  SbString m_compressionName;
 
  std::vector<unsigned char> m_compressedBuffer;
 
  size_t m_level;
};
 
#ifdef _MSC_VER
#pragma warning( pop )
#endif
 
#endif