TeDecoderVirtualMemory Class Reference

Implements a virtual memory strategy to decode raster in blocks. More...

#include <TeDecoderVirtualMemory.h>

Inheritance diagram for TeDecoderVirtualMemory:

List of all members.

Classes
struct	TeBlockIndexMapFunc
Public Member Functions
	TeDecoderVirtualMemory ()
	Empty constructor.
	TeDecoderVirtualMemory (const TeRasterParams par)
	Constructor from parameters.
virtual	~TeDecoderVirtualMemory ()
	Destructor.
bool	getElement (int col, int lin, double &val, int band)
	Sets the value of a specific raster pixel.
bool	setElement (int col, int lin, double val, int band)
	Gets an specific element (col, lin, band) of a raster data.
void	init ()
	Initializes the internal structures of the decoder, from its raster parameters structure.
bool	clear ()
	Clears the decoder internal structures.
void	setCacheSize (int size)
	Defines the physical size of the cache.
int	getCacheSize ()
	Returns the physical size of the cache.
void	setCacheNTiles (int n)
	Defines the number of tiles in the cache.
int	getCacheNTiles ()
	Returns the number of tiles in the cache.
Protected Member Functions
virtual bool	putRasterBlock (const TeBlockIndex &index, void *buf, long bsize)=0
	Saves a raster tile from a virtual memory to permanent storage.
virtual bool	getRasterBlock (const TeBlockIndex &index, void *buf)=0
	Gets the raster block with index identifier.
virtual TeBlockIndex	blockIndex (int col, int lin, int band)
	Codifies the unique identifier of the raster block that contains a certain pixel.
virtual void	blockIndexPos (const TeBlockIndex &index, int &ulCol, int &ulLin, int &band)
	Returns the parameters of a tile from its indexs.
TeMemoryPage *	loadBlock (int col, int lin, int band)
	Retrieve a block of the cache that contains an element.

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Detailed Description

Implements a virtual memory strategy to decode raster in blocks.

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Constructor & Destructor Documentation

TeDecoderVirtualMemory::TeDecoderVirtualMemory

(

)

[inline]

Empty constructor.

TeDecoderVirtualMemory::TeDecoderVirtualMemory

(

const TeRasterParams

par

)

Constructor from parameters.

TeDecoderVirtualMemory::~TeDecoderVirtualMemory

(

)

[virtual]

Destructor.

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Member Function Documentation

TeBlockIndex TeDecoderVirtualMemory::blockIndex	(	int	col,
		int	lin,
		int	band
	)		[protected, virtual]

Codifies the unique identifier of the raster block that contains a certain pixel.

Parameters:

col	column number
lin	pixel line number
band	pixel band

Returns:

block index

Reimplemented in TeDecoderDatabase.

void TeDecoderVirtualMemory::blockIndexPos	(	const TeBlockIndex &	index,
		int &	ulCol,
		int &	ulLin,
		int &	band
	)		[protected, virtual]

Returns the parameters of a tile from its indexs.

Reimplemented in TeDecoderDatabase.

bool TeDecoderVirtualMemory::clear

(

)

[virtual]

Clears the decoder internal structures.

Implements TeDecoder.

Reimplemented in TeGDALDecoder, and TeDecoderDatabase.

int TeDecoderVirtualMemory::getCacheNTiles

(

)

Returns the number of tiles in the cache.

int TeDecoderVirtualMemory::getCacheSize

(

)

Returns the physical size of the cache.

bool TeDecoderVirtualMemory::getElement	(	int	col,
		int	lin,
		double &	val,
		int	band
	)		[virtual]

Sets the value of a specific raster pixel.

Parameters:

col	pixel column identifier
lin	pixel line identifier
val	pixel value being inserted
band	pixel band identifier

Implements TeDecoder.

virtual bool TeDecoderVirtualMemory::getRasterBlock	(	const TeBlockIndex &	index,
		void *	buf
	)		[protected, pure virtual]

Gets the raster block with index identifier.

Parameters:

index	block index
buf	pointer to a raster tile in memory

Implemented in TeGDALDecoder, and TeDecoderDatabase.

void TeDecoderVirtualMemory::init

(

)

[virtual]

Initializes the internal structures of the decoder, from its raster parameters structure.

Implements TeDecoder.

Reimplemented in TeGDALDecoder, and TeDecoderDatabase.

TeMemoryPage * TeDecoderVirtualMemory::loadBlock	(	int	col,
		int	lin,
		int	band
	)		[protected]

Retrieve a block of the cache that contains an element.

virtual bool TeDecoderVirtualMemory::putRasterBlock	(	const TeBlockIndex &	index,
		void *	buf,
		long	bsize
	)		[protected, pure virtual]

Saves a raster tile from a virtual memory to permanent storage.

Parameters:

index	block index
buf	pointer to a raster tile in memory
bsize	block size

Implemented in TeGDALDecoder, and TeDecoderDatabase.

void TeDecoderVirtualMemory::setCacheNTiles

(

int

n

)

Defines the number of tiles in the cache.

void TeDecoderVirtualMemory::setCacheSize

(

int

size

)

Defines the physical size of the cache.

bool TeDecoderVirtualMemory::setElement	(	int	col,
		int	lin,
		double	val,
		int	band
	)		[virtual]

Gets an specific element (col, lin, band) of a raster data.

Parameters:

col	pixel column identifier
lin	pixel line identifier
val	pixel value being retrieved
band	pixel band identifier

Implements TeDecoder.

Reimplemented in TeGDALDecoder.

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

• E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/kernel/TeDecoderVirtualMemory.h
• E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/kernel/TeDecoderVirtualMemory.cpp