Unsigned 16 bit normalized remap table to go to/from normalized value to pixel value. More...

#include <ossimNormalizedU16RemapTable.h>

Inheritance diagram for ossimNormalizedU16RemapTable:

Public Types
enum	{ TABLE_ENTRIES = 65536 }

Public Member Functions
	ossimNormalizedU16RemapTable ()
	default constructor More...

virtual	~ossimNormalizedU16RemapTable ()
	virtual destructor More...

virtual ossim_int32	getEntries () const
	Gets the number of table entries. More...

virtual ossim_float64	operator[] (ossim_int32 pix) const
	Gets a normalized value (between '0.0' and '1.0') from a pixel value. More...

virtual ossim_float64	normFromPix (ossim_int32 pix) const
	Gets a normalized value (between '0.0' and '1.0') from a pixel value. More...

virtual ossim_int32	pixFromNorm (ossim_float64 normPix) const
	Returns an pixel value as an int from a normalized value. More...

Public Member Functions inherited from ossimNormalizedRemapTable
	ossimNormalizedRemapTable ()
	default constructor More...

virtual	~ossimNormalizedRemapTable ()
	virtual destructor More...

virtual ossim_float64	getNormalizer () const
	Get the value used to normalize and un-normalize table entries. More...

Static Protected Attributes
static ossim_float64	theTable [TABLE_ENTRIES]

static bool	theTableIsInitialized = false

Detailed Description

Unsigned 16 bit normalized remap table to go to/from normalized value to pixel value.

Definition at line 27 of file ossimNormalizedU16RemapTable.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
TABLE_ENTRIES

Definition at line 36 of file ossimNormalizedU16RemapTable.h.

    {
       TABLE_ENTRIES   = 65536 // 2^16
    };

Constructor & Destructor Documentation

◆ ossimNormalizedU16RemapTable()

ossimNormalizedU16RemapTable::ossimNormalizedU16RemapTable ( )

default constructor

Definition at line 20 of file ossimNormalizedU16RemapTable.cpp.

References getEntries(), ossimNormalizedRemapTable::getNormalizer(), theTable, and theTableIsInitialized.

    : ossimNormalizedRemapTable()
 {
    if (!theTableIsInitialized)
    {
       const ossim_int32   ENTRIES     = getEntries();
       const ossim_float64 DENOMINATOR = getNormalizer();
       
       //---
       // Initialize the remap table.
       //---
       theTable[0] = 0.0; // Index zero always for null.
       for (ossim_int32 i = 1; i < ENTRIES; ++i)
       {
          theTable[i] = static_cast<ossim_float64>(i)/DENOMINATOR;
       }
 
       theTableIsInitialized = true;
    }
 }

◆ ~ossimNormalizedU16RemapTable()

ossimNormalizedU16RemapTable::~ossimNormalizedU16RemapTable ( )

virtual

virtual destructor

Definition at line 41 of file ossimNormalizedU16RemapTable.cpp.

42 {}

Member Function Documentation

◆ getEntries()

ossim_int32 ossimNormalizedU16RemapTable::getEntries ( ) const

inlinevirtual

Gets the number of table entries.

Returns: The number of entries in a table.

Implements ossimNormalizedRemapTable.

Definition at line 77 of file ossimNormalizedU16RemapTable.h.

References TABLE_ENTRIES.

Referenced by ossimNormalizedU16RemapTable().

 {
    return TABLE_ENTRIES;
 }

◆ normFromPix()

ossim_float64 ossimNormalizedU16RemapTable::normFromPix ( ossim_int32 pix ) const

inlinevirtual

Gets a normalized value (between '0.0' and '1.0') from a pixel value.

Returns: Value between 0.0 and 1.0.

Implements ossimNormalizedRemapTable.

Definition at line 88 of file ossimNormalizedU16RemapTable.h.

References TABLE_ENTRIES, and theTable.

Referenced by ossimU16ImageData::convertToNormalizedDouble(), and ossimU16ImageData::getNormalizedFloat().

 {
    return ( (pix < TABLE_ENTRIES) ? (pix >= 0 ? theTable[pix] : 0.0) : 1.0);
 }

◆ operator[]()

ossim_float64 ossimNormalizedU16RemapTable::operator[] ( ossim_int32 pix ) const

inlinevirtual

Gets a normalized value (between '0.0' and '1.0') from a pixel value.

Returns: Value between 0.0 and 1.0.

Implements ossimNormalizedRemapTable.

Definition at line 82 of file ossimNormalizedU16RemapTable.h.

References TABLE_ENTRIES, and theTable.

 {
    return ( (pix < TABLE_ENTRIES) ? (pix >= 0 ? theTable[pix] : 0.0) : 1.0);  
 }

◆ pixFromNorm()

ossim_int32 ossimNormalizedU16RemapTable::pixFromNorm ( ossim_float64 normPix ) const

inlinevirtual

Returns an pixel value as an int from a normalized value.

Returns: Value between scalar range of remap table.

Implements ossimNormalizedRemapTable.

Definition at line 94 of file ossimNormalizedU16RemapTable.h.

References ossimNormalizedRemapTable::getNormalizer().

Referenced by ossimU16ImageData::copyNormalizedBufferToTile(), and ossimU16ImageData::setNormalizedFloat().

 {
    if(normPix <= 0.0) return 0;
    
    // un-normalize...
    ossim_float64 p = normPix * getNormalizer();
 
    // Ensure pixel is in range.
    p = ( (p < TABLE_ENTRIES) ? (p >= 0.0 ? p : 0.0) : getNormalizer());
 
    // Since going from double to int round...
    p = ossim::round<ossim_int32>(p);
        
    if(p == 0.0)
    {
       p = 1.0;
    }
    
    return static_cast<ossim_int32>(p);
 }