FITSQualityImage.h

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// # FITSQualityImage.h: Class providing native access to FITS images
// # Copyright (C) 2001,2002
// # Associated Universities, Inc. Washington DC, USA.
// #
// # This library is free software; you can redistribute it and/or modify it
// # under the terms of the GNU Library General Public License as published by
// # the Free Software Foundation; either version 2 of the License, or (at your
// # option) any later version.
// #
// # This library is distributed in the hope that it will be useful, but WITHOUT
// # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
// # License for more details.
// #
// # You should have received a copy of the GNU Library General Public License
// # along with this library; if not, write to the Free Software Foundation,
// # Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
// #
// # Correspondence concerning AIPS++ should be addressed as follows:
// #        Internet email: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef IMAGES_FITSQUALITYIMAGE_H
#define IMAGES_FITSQUALITYIMAGE_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/Arrays/ArrayFwd.h>
#include <casacore/images/Images/FITSErrorImage.h>
#include <casacore/images/Images/ImageInterface.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// # Forward Declarations
template <class T>
class Lattice;
//
class FITSImage;
class FITSQualityMask;
class IPosition;
class Slicer;
 
// <summary>
// Class providing native access to FITS Quality Images.
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="" tests="tFITSQualityImage.cc">
// </reviewed>
 
// <prerequisite>
//   <li> <linkto class=FITSImage>FITSImage</linkto>
//   <li> <linkto class=FITSErrorImage>FITSErrorImage</linkto>
// </prerequisite>
 
// <etymology>
// The class provides access to a quality image via two extensions
// in the corresponding FITS file.
// </etymology>
 
// <synopsis>
//  A FITSQualityImage provides native access to FITS images by accessing
//  the data and the error values via the classes FITSImage and
//  FITSErrorImage, respectively. A QualityCoordinate connects these
//  two layers. The FITSQualityImage is read only.
// </synopsis>
 
// <example>
// <srcblock>
//     FITSQualityImage fitsQIStat("im.fits", 1, 2);
//     LogIO logger(or);
//     ImageStatistics<Float> stats(fitsQIStat, logger);
//     Bool ok = stats.display();
//    </srcblock>
// </example>
 
// <motivation>
// This provides access to FITS Quality Images
// </motivation>
 
// # <todo asof="2011/06/17">
// # </todo>
 
class FITSQualityImage : public ImageInterface<Float> {
 public:
  // Construct a FITSQualityImage from the FITS file name and extensions
  // specified in the input.
  explicit FITSQualityImage(const String& name);
 
  // Construct a FITSQualityImage from the disk FITS file name and extensions.
  explicit FITSQualityImage(const String& name, uInt whichDataHDU, uInt whichErrorHDU);
 
  // Copy constructor (reference semantics)
  FITSQualityImage(const FITSQualityImage& other);
 
  // Destructor
  ~FITSQualityImage();
 
  // Assignment (reference semantics).
  FITSQualityImage& operator=(const FITSQualityImage& other);
 
  // # ImageInterface virtual functions
 
  // Make a copy of the object with new (reference semantics).
  virtual ImageInterface<Float>* cloneII() const;
 
  // Given the misc-info of a CASA image (with quality-axis)
  // the misc-info of the data sub-image and the error sub-image
  // are produced. This ensures that, if written to FITS, the
  // data and error extensions have the all necessary keywords.
  Bool static qualFITSInfo(String& error, TableRecord& dataExtMiscInfo,
                           TableRecord& errorExtMiscInfo, const TableRecord& miscInfo);
 
  // Get the FITS data
  FITSImage* fitsData() const { return fitsdata_p; };
 
  // Get the FITS error
  FITSErrorImage* fitsError() const { return fitserror_p; };
 
  // Get the image type (returns FITSImage).
  virtual String imageType() const;
 
  // Function which changes the shape of the FITSQualityImage.
  // Throws an exception as FITSQualityImage is not writable.
  virtual void resize(const TiledShape& newShape);
 
  // Has the object really a mask?  The FITSQualityImage always
  // has a pixel mask and never has a region mask so this
  // always returns True
  virtual Bool isMasked() const;
 
  // FITSQualityImage always has a pixel mask so returns True
  virtual Bool hasPixelMask() const;
 
  // Get access to the pixelmask.  FITSQualityImage always has a pixel mask.
  // <group>
  virtual const Lattice<Bool>& pixelMask() const;
  virtual Lattice<Bool>& pixelMask();
  // </group>
 
  // Get the region used.  There is no region.
  // Always returns 0.
  virtual const LatticeRegion* getRegionPtr() const;
 
  // Do the actual get of the data.
  // Returns False as the data do not reference another Array
  virtual Bool doGetSlice(Array<Float>& buffer, const Slicer& theSlice);
 
  // The FITSQualityImage is not writable, so this throws an exception.
  virtual void doPutSlice(const Array<Float>& sourceBuffer, const IPosition& where,
                          const IPosition& stride);
 
  // Do the actual get of the mask data.   The return value is always
  // False, thus the buffer does not reference another array.
  virtual Bool doGetMaskSlice(Array<Bool>& buffer, const Slicer& section);
 
  // # LatticeBase virtual functions
 
  // The lattice is paged to disk.
  virtual Bool isPaged() const;
 
  // The lattice is persistent.
  virtual Bool isPersistent() const;
 
  // The FITSImage is not writable.
  virtual Bool isWritable() const;
 
  // Returns the name of the disk file.
  virtual String name(Bool stripPath = False) const;
 
  // Return the shape of the FITSImage.
  virtual IPosition shape() const;
 
  // Returns the maximum recommended number of pixels for a cursor. This is
  // the number of pixels in a tile.
  virtual uInt advisedMaxPixels() const;
 
  // Help the user pick a cursor for most efficient access if they only want
  // pixel values and don't care about the order or dimension of the
  // cursor.
  virtual IPosition doNiceCursorShape(uInt maxPixels) const;
 
  // Check class invariants.
  virtual Bool ok() const;
 
  // Temporarily close the image.
  virtual void tempClose();
  virtual void tempCloseData();
  virtual void tempCloseError();
 
  // Reopen a temporarily closed image.
  virtual void reopen();
 
  // Return the (internal) data type (TpFloat or TpShort).
  DataType dataType() const;
 
  // Return the data HDU number
  uInt whichDataHDU() const { return whichDataHDU_p; }
 
  // Return the error HDU number
  uInt whichErrorHDU() const { return whichErrorHDU_p; }
 
  // Maximum size - not necessarily all used. In pixels.
  virtual uInt maximumCacheSize() const;
 
  // Set the maximum (allowed) cache size as indicated.
  virtual void setMaximumCacheSize(uInt howManyPixels);
 
  // Set the cache size as to "fit" the indicated path.
  virtual void setCacheSizeFromPath(const IPosition& sliceShape, const IPosition& windowStart,
                                    const IPosition& windowLength, const IPosition& axisPath);
 
  // Set the actual cache size for this Array to be be big enough for the
  // indicated number of tiles. This cache is not shared with PagedArrays
  // in other rows and is always clipped to be less than the maximum value
  // set using the setMaximumCacheSize member function.
  // tiles. Tiles are cached using a first in first out algorithm.
  virtual void setCacheSizeInTiles(uInt howManyTiles);
 
  // Clears and frees up the caches, but the maximum allowed cache size is
  // unchanged from when setCacheSize was called
  virtual void clearCache();
 
  // Report on cache success.
  virtual void showCacheStatistics(ostream& os) const;
 
 private:
  String name_p;
  String fullname_p;
  FITSImage* fitsdata_p;
  FITSErrorImage* fitserror_p;
  Lattice<Bool>* pPixelMask_p;
  TiledShape shape_p;
  uInt whichDataHDU_p;
  uInt whichErrorHDU_p;
  uInt whichMaskHDU_p;
  FITSErrorImage::ErrorType errType_p;
  Bool isClosed_p;
  Bool isDataClosed_p;
  Bool isErrorClosed_p;
 
  // Reopen the image if needed.
  void reopenIfNeeded() const;
  void reopenDataIfNeeded();
  void reopenErrorIfNeeded();
 
  // Get the extension indices from an
  // extension expression.
  void getExtInfo();
 
  // Setup the object (used by constructors).
  void setup();
 
  // Make sure the input is compatible.
  Bool checkInput();
};
 
}  // namespace casacore
 
#endif