vil_nitf2_data_mask_table.h

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// vil_nitf2: Written by Rob Radtke (rob@) and Harry Voorhees (hlv@) of
// Stellar Science Ltd. Co. (stellarscience.com) for
// Air Force Research Laboratory, 2005.

#ifndef VIL_NITF2_DATA_MASK_TABLE_H
#define VIL_NITF2_DATA_MASK_TABLE_H
//:
// \file

#include <vector>
#include <string>
#include <vxl_config.h>
#ifdef _MSC_VER
#  include <vcl_msvc_warnings.h>
#endif
#include <vil/vil_pixel_format.h>

class vil_stream;

//: This class is responsible for parsing a NITF 2.1 data mask table.
//  When present, a vil_nitf2_image_subheader() will use this class
//  to extract the table from the file.  It reads a vil_stream, via
//  the parse() method and will return false if it failed.
class vil_nitf2_data_mask_table
{
 public:
  vil_nitf2_data_mask_table( unsigned int numBlocksX, unsigned int numBlocksY,
                             unsigned int numBands, const std::string& imode );
  bool parse( vil_stream* stream );

  //: If this function returns true, then you may call \sa block_band_offset()
  bool has_offset_table() const { return BMR_n_BND_m.size() > 0; }

  //: If this function returns true, then you may call \sa pad_pixel()
  bool has_pad_pixel_table() const { return TMR_n_BND_m.size() > 0; }

  vxl_uint_32 blocked_image_data_offset() const;

  //: Returns true iff this block is present in the data.  False otherwise.
  //  If this returns false, then there is not sense calling block_band_offset
  //  for this band/block combination. It will return 0xFFFFFFFF.
  //  If this returns false, then this entire block/band is considered to be blank.
  vxl_uint_32 block_band_present( unsigned int block_x, unsigned int block_y, int band = -1) const;

  //:
  //  if imode == "S", then the band argument is used and I will return the offset to 'band'
  //  if imode != "S", then the band argument is ignored, and I will return the offset to the
  //  beginning of the requested block
  vxl_uint_32 block_band_offset( unsigned int block_x, unsigned int block_y, int band = -1) const;

  //:
  // band argument is ignored if imode != "S"... i.e. all bands have the same pad pixel in that case
  vxl_uint_32 pad_pixel( unsigned int block_x, unsigned int block_y, int band ) const;

  vxl_uint_32 block_band_has_pad( unsigned int block_x, unsigned int block_y, int band = -1) const;

  static void maybe_endian_swap( char* a, unsigned sizeOfAInBytes, vil_pixel_format pixFormat );
  static void maybe_endian_swap( char* a, unsigned sizeOfAInBytes, unsigned int bytesPerSample );
 protected:
  //Blocked Image Data Offset (in bytes)
  vxl_uint_32 IMDATOFF;
  //Block Mask Record Length (in bytes)
  vxl_uint_16 BMRLNTH;
  //Pad Pixel Mask Record Length (in bytes)
  vxl_uint_16 TMRLNTH;
  //Pad Output Pixel Code Length (in bits)
  vxl_uint_16 TPXCDLNTH;
  //Pad Output Pixel Code
  // (it's an integer, but its length is TPXCDLNTH rounded up to the nearest byte)
#if VXL_HAS_INT_64
  vxl_uint_64 TPXCD;
#else
  vxl_uint_32 TPXCD;
#endif //VXL_HAS_INT_64

  //Block n, Band m Offset
  //indexed BMR_n_BND_m[row][col][band] for i_mode = "S" else
  //indexed BMR_n_BND_m[row][col]
  std::vector< std::vector< std::vector< vxl_uint_32 > > > BMR_n_BND_m;
  //Pad Pixel n, Band m
  //indexed TMR_n_BND_m[row][col][band] for i_mode = "S" else
  //indexed TMR_n_BND_m[row][col]
  std::vector< std::vector< std::vector< vxl_uint_32 > > > TMR_n_BND_m;

  unsigned int num_blocks_x;
  unsigned int num_blocks_y;
  unsigned int num_bands;
  std::string i_mode;
};

#endif // VIL_NITF2_DATA_MASK_TABLE_H