Method encode

multiresolutionimageinterface/JPEG2000Codec.cpp:280–397

}

void JPEG2000Codec::encode(char* data, unsigned int& size, const unsigned int& tileSize, const unsigned int& rate, const unsigned int& nrComponents, const pathology::DataType& dataType, const pathology::ColorType& colorSpace) const
{

  int depth = 8;
  if (dataType == pathology::DataType::Float || dataType == pathology::DataType::InvalidDataType) {
    return;
  }
  else if (dataType == pathology::DataType::UInt16) {
    depth = 16;
  }
  else if (dataType == pathology::DataType::UInt32 && colorSpace != pathology::ColorType::RGBA) {
    depth = 32;
  }
  
  opj_cparameters_t	encodeParameters;	// compression parameters.
  encodeParameters.tcp_mct = nrComponents > 1 ? 1 : 0; //Decide if MCT should be used.
  opj_set_default_encoder_parameters(&encodeParameters);
  if (rate < 100)
  {
    encodeParameters.tcp_rates[0] = 100.0f / rate;
    encodeParameters.irreversible = 1;//ICT
  }
  else {
    encodeParameters.tcp_rates[0] = 0;
  }
  encodeParameters.tcp_numlayers = 1;
  encodeParameters.cp_disto_alloc = 1;

  //Set the image components parameters.
  opj_image_cmptparm_t*componentParameters = new opj_image_cmptparm_t[nrComponents];
  for (unsigned int cnt = 0; cnt < nrComponents; cnt++)
  {
    componentParameters[cnt].dx = encodeParameters.subsampling_dx;
    componentParameters[cnt].dy = encodeParameters.subsampling_dy;
    componentParameters[cnt].h = tileSize;
    componentParameters[cnt].w = tileSize;
    componentParameters[cnt].prec = depth;
    componentParameters[cnt].bpp = depth;
    componentParameters[cnt].sgnd = 0;
    componentParameters[cnt].x0 = 0;
    componentParameters[cnt].y0 = 0;
  }
  // Also set the colorspace
  OPJ_COLOR_SPACE jpegColorSpace = OPJ_CLRSPC_GRAY;// Set the default.
  if (colorSpace == pathology::ColorType::RGB || colorSpace == pathology::ColorType::RGBA) {
    jpegColorSpace = OPJ_CLRSPC_SRGB;
  }

  // Get a J2K compressor handle.
  opj_codec_t* encoder = opj_create_compress(OPJ_CODEC_J2K);

  //Catch events using our callbacks and give a local context.
  opj_set_info_handler(encoder, info_callback, NULL);
  opj_set_warning_handler(encoder, warning_callback, NULL);
  opj_set_error_handler(encoder, error_callback, NULL);

  //Set the "OpenJpeg like" stream data.
  opj_memory_stream encodingBuffer;