LCMask.h

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// # LCMask.h: Class to define a rectangular mask as a temporary region
// # Copyright (C) 2000,2003
// # 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 LATTICES_LCMASK_H
#define LATTICES_LCMASK_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/lattices/LRegions/LCBox.h>
#include <casacore/lattices/Lattices/Lattice.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// <summary>
// Class to define a rectangular mask as a temporary region
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="" tests="">
// </reviewed>
 
// <prerequisite>
//   <li> <linkto class=LCRegion>LCRegion</linkto>
// </prerequisite>
 
// <synopsis>
// The LCMask class is a specialization of class
// <linkto class=LCRegion>LCRegion</linkto>.
// <br>
// It can be used to define a temporary mask (e.g. for a
// <linkto class=TempImage>TempImage</linkto>).
// It is possible to define the mask for the full lattice, but one
// can also define it for part of a lattice. In the latter case a
// <linkto class=LCBox>LCBox</linkto> has to be given as well to
// define for which part of the image the mask has to be used.
// </synopsis>
 
// <example>
// <srcblock>
// </srcblock>
// </example>
 
// <todo asof="1997/11/11">
// </todo>
 
class LCMask : public LCRegionSingle {
 public:
  LCMask();
 
  // Construct an LCMask object for a full lattice with the given shape.
  // It creates a TempLattice<Bool> to hold the mask.
  explicit LCMask(const IPosition& latticeShape);
 
  // Construct an LCMask object for a full lattice with the shape of the mask.
  // It clones the mask object.
  explicit LCMask(Lattice<Bool>& mask);
 
  // Construct an LCMask object for the part of a lattice given by the box.
  // The box defines the position of the mask in the lattice.
  // The box shape and given mask shape should be equal.
  // It creates a TempImage<Bool> to hold the mask.
  LCMask(const IPosition& maskShape, const LCBox& box);
 
  // Construct an LCMask object for the part of a lattice given by the box.
  // The box defines the position of the mask in the lattice.
  // The box shape and given mask shape should be equal.
  // It clones the mask object.
  LCMask(Lattice<Bool>& mask, const LCBox& box);
 
  // Copy constructor (copy semantics).
  LCMask(const LCMask& other);
 
  // Destructor
  virtual ~LCMask();
 
  // Assignment (reference semantics).
  LCMask& operator=(const LCMask& other);
 
  // Make a copy of the derived object.
  LCRegion* cloneRegion() const override;
 
  // This function is used by the LatticeIterator class to generate an
  // iterator of the correct type for this Lattice. Not recommended
  // for general use.
  LatticeIterInterface<Bool>* makeIter(const LatticeNavigator& navigator,
                                       Bool useRef) const override;
 
  // Returns the maximum recommended number of pixels for a cursor.
  // This is the number of pixels in a tile.
  uInt advisedMaxPixels() const override;
 
  // Help the user pick a cursor for most efficient access.
  IPosition doNiceCursorShape(uInt maxPixels) const override;
 
  // Maximum size - not necessarily all used. In pixels.
  uInt maximumCacheSize() const override;
 
  // Set the maximum (allowed) cache size as indicated.
  void setMaximumCacheSize(uInt howManyPixels) override;
 
  // Set the cache size as to "fit" the indicated path.
  void setCacheSizeFromPath(const IPosition& sliceShape, const IPosition& windowStart,
                            const IPosition& windowLength, const IPosition& axisPath) override;
 
  // 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.
  void setCacheSizeInTiles(uInt howManyTiles) override;
 
  // Clears and frees up the caches, but the maximum allowed cache size is
  // unchanged from when setCacheSize was called
  void clearCache() override;
 
  // Report on cache success.
  void showCacheStatistics(std::ostream& os) const override;
 
  // Handle the (un)locking.
  // <group>
  Bool lock(FileLocker::LockType, uInt nattempts) override;
  void unlock() override;
  Bool hasLock(FileLocker::LockType) const override;
  // </group>
 
  // Resynchronize the object with the contenta tof the possible file.
  // This function is only useful if no read-locking is used, ie.
  // if the table lock option is UserNoReadLocking or AutoNoReadLocking.
  // In that cases the table system does not acquire a read-lock, thus
  // does not synchronize itself automatically.
  void resync() override;
 
  // Flush the data (but do not unlock).
  void flush() override;
 
  // Temporarily close the lattice.
  // It will be reopened automatically on the next access.
  void tempClose() override;
 
  // Explicitly reopen the temporarily closed lattice.
  void reopen() override;
 
  // Get the class name (to store in the record).
  static String className();
 
  // Region type. Returns class name.
  String type() const override;
 
  // Convert the (derived) object to a record.
  // This cannot be done and results in an exception.
  TableRecord toRecord(const String& tableName) const override;
 
  // An LCMask is writable if the underlying Lattice is.
  Bool isWritable() const override;
 
 protected:
  // Comparison
  Bool equals(const LCRegion& other) const override;
 
  // Construct another LCMask (for e.g. another lattice) by moving
  // this one. It recalculates the bounding mask.
  // A positive translation value indicates "to right".
  LCRegion* doTranslate(const Vector<Float>& translateVector,
                        const IPosition& newLatticeShape) const override;
 
 private:
  LCBox itsBox;
  Lattice<Bool>* itsMask;
};
 
}  // namespace casacore
 
#endif