CompressionElement Class Reference

#include <CovarianceParameterization.h>

Public Types
enum	Method {   float16 =0, reduceMantissa =1, logPack =2, tanLogPack =3,   zero =4, one =5 }
enum	Target { realValue =0, ratioToRef =1, differenceToRef =2 }

Public Member Functions
	CompressionElement ()
	CompressionElement (Method m, Target t, int bitsUsed, std::vector< float > p)
uint16_t	pack (float value, float ref=0.) const
float	unpack (uint16_t packed, float ref=0.) const

Public Attributes
int	bits
Method	method
std::vector< float >	params
Target	target

Detailed Description

Definition at line 9 of file CovarianceParameterization.h.

Member Enumeration Documentation

enum CompressionElement::Method

Enumerator
float16
reduceMantissa
logPack
tanLogPack
zero
one

Definition at line 11 of file CovarianceParameterization.h.

{float16=0,reduceMantissa=1,logPack=2,tanLogPack=3,zero=4,one=5};

enum CompressionElement::Target

Enumerator
realValue
ratioToRef
differenceToRef

Definition at line 12 of file CovarianceParameterization.h.

{realValue=0,ratioToRef=1,differenceToRef=2};

Constructor & Destructor Documentation

CompressionElement::CompressionElement ( )

inline

Definition at line 13 of file CovarianceParameterization.h.

Referenced by CovarianceParameterization::load().

:method(zero),target(realValue){}

CompressionElement::CompressionElement ( Method  m, Target  t, int  bitsUsed, std::vector< float >  p  )

inline

Definition at line 14 of file CovarianceParameterization.h.

: method(m),target(t),bits(bitsUsed),params(p){}

Member Function Documentation

uint16_t CompressionElement::pack	(	float	value,
		float	ref = 0.
	)		const

Definition at line 11 of file CovarianceParameterization.cc.

References bits, differenceToRef, float16, MiniFloatConverter::float32to16(), logPack, method, logintpack::pack16log(), params, alignCSCRings::r, ratioToRef, realValue, reduceMantissa, MiniFloatConverter::reduceMantissaToNbits(), tanLogPack, target, relativeConstraints::value, and zero.

Referenced by pyrootRender.interactiveRender::draw(), and CovarianceParameterization::loadedVersion().

{
    float toCompress=0;
    switch(target) {
        case(realValue):
          toCompress=value;
          break;
        case(ratioToRef):
          toCompress=value/ref;
          break;
        case(differenceToRef):
          toCompress=value-ref;
          break;
    }
    switch(method) {
        case(float16):
          return MiniFloatConverter::float32to16(toCompress*params[0]);
          break;
        case(reduceMantissa):
          return MiniFloatConverter::reduceMantissaToNbits(toCompress,params[0]);
          break;
        case(zero):
          return 0;
          break;
        case(one):
          return 1.0;
          break;
        case(tanLogPack):
          return 0; //FIXME: should be implemented
          break;
        case(logPack):
          int16_t r=logintpack::pack16log(toCompress,params[0],params[1],bits);
          return * reinterpret_cast<uint16_t *>(&r); 
          break;
      
    }
  return 0;
}

float CompressionElement::unpack	(	uint16_t	packed,
		float	ref = 0.
	)		const

Definition at line 49 of file CovarianceParameterization.cc.

References bits, differenceToRef, float16, MiniFloatConverter::float16to32(), logPack, method, params, ratioToRef, realValue, reduceMantissa, tanLogPack, target, logintpack::unpack16log(), and zero.

Referenced by CovarianceParameterization::loadedVersion().

{
    float unpacked=0;
    switch(method) {
        case(float16):
          unpacked= MiniFloatConverter::float16to32(packed)/params[0];
          break;
        case(reduceMantissa):
          unpacked=packed;
          break;
        case(logPack):
          unpacked=logintpack::unpack16log(* reinterpret_cast<int16_t *>(&packed),params[0],params[1],bits);
          break;
        case(zero):
          unpacked=0;
          break;
        case(one):
        case(tanLogPack):
          unpacked=1; //FIXME: should be implemented
    }
    switch(target) {
        case(realValue):
          return unpacked;
        case(ratioToRef):
          return unpacked*ref;
        case(differenceToRef):
          return unpacked+ref;
    }

    return ref;
  
}

Member Data Documentation

int CompressionElement::bits

Definition at line 17 of file CovarianceParameterization.h.

Referenced by pack(), and unpack().

Method CompressionElement::method

Definition at line 15 of file CovarianceParameterization.h.

Referenced by pack(), and unpack().

std::vector<float> CompressionElement::params

Definition at line 18 of file CovarianceParameterization.h.

Referenced by pack(), and unpack().

Target CompressionElement::target

Definition at line 16 of file CovarianceParameterization.h.

Referenced by pack(), and unpack().