Method decodeTile

multiresolutionimageinterface/VSIImage.cpp:211–253

}

char* VSIImage::decodeTile(int no, int row, int col) const {	
  int size = _tileSizeX*_tileSizeY*3;
  char* buf = new char[size];
  std::fill(buf, buf + size, 255);
	if (no!=_tileCoords.size()) {
		ifstream ets;
		ets.open(_etsFile.c_str(), ios::in | ios::binary);
		ets.seekg(_tileOffsets[no]);
    ets.read(buf, size);
    if (_compressionType == 0) {
      return buf;
    }
    else if (_compressionType == 3) {
      JPEG2000Codec cod;
      cod.decode((unsigned char*)buf, size, size);
    }
    else if (_compressionType == 2 || _compressionType == 5) {
      jpeg_decompress_struct cinfo;
      jpeg_error_mgr jerr; //error handling
      jpeg_create_decompress(&cinfo);
      cinfo.err = jpeg_std_error(&jerr);      
      jpeg_mem_src(&cinfo, (unsigned char*)buf, size);
      jpeg_read_header(&cinfo, true);
      if (_compressionType == 2) {
        cinfo.jpeg_color_space = JCS_YCbCr;
      } else {
        cinfo.jpeg_color_space = JCS_RGB;
      }
      jpeg_start_decompress(&cinfo);
      unsigned char* outBuf = new unsigned char[size];
      unsigned char* line = outBuf;
      while (cinfo.output_scanline < cinfo.output_height) {
        jpeg_read_scanlines (&cinfo, &line, 1);
        line += 3*cinfo.output_width;
      }
      jpeg_finish_decompress(&cinfo);
      jpeg_destroy_decompress(&cinfo);
      delete[] buf;
      buf = (char*)outBuf;
    }
	}
	return buf;
}

void* VSIImage::readDataFromImage(const long long& startX, const long long& startY, const unsigned long long& width, 
    const unsigned long long& height, const unsigned int& level) {