CompressAuto Class Reference

#include <CompressionStrategy.h>

Detailed Description

A basic adaptive compression strategy.

This strategy selects the most appropriate compression algorithm at extension creation according to simple criteria such as the pixel type and raster shape, as well as the requested losslessness of the compression.

Small images (less than a FITS block size) are not compressed. Otherwise, the following algorithms are tried in this order: Plio, HCompress, Rice. If none of them is suitable (e.g. because lossless compression was requested even for floats), then the ShuffledGzip is returned.

Public Member Functions
Construction
	CompressAuto (CompressionType type=CompressionType::Lossless)
	Constructor.
Operations
template<typename T >
bool	apply (fitsfile *fptr, const ImageHdu::Initializer< T > &init)
	Compress if possible.
template<typename T >
std::unique_ptr< Compress< ShuffledGzip > >	gzip (const ImageHdu::Initializer< T > &init)
	Create a ShuffledGzip action if compatible.
template<typename T >
std::unique_ptr< Compress< Rice > >	rice (const ImageHdu::Initializer< T > &init)
	Create a Rice action if compatible.
template<typename T >
std::unique_ptr< Compress< HCompress > >	hcompress (const ImageHdu::Initializer< T > &init)
	Create a HCompress action if compatible.
template<typename T >
std::unique_ptr< Compress< Plio > >	plio (const ImageHdu::Initializer< T > &init)
	Create a Plio action if compatible.
Public Member Functions inherited from CompressionActionMixin< CompressAuto >
	CompressionActionMixin ()=default
Public Member Functions inherited from CompressionAction
	CompressionAction ()=default

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The documentation for this class was generated from the following file:

• EleFits/EleFits/CompressionStrategy.h