SoJpegDataCompressor Class Reference
[Compressor]

Jpeg data compression More...

#include <LDM/compressors/SoJpegDataCompressor.h>

Inheritance diagram for SoJpegDataCompressor:

List of all members.

Public Member Functions
	SoJpegDataCompressor ()
virtual	~SoJpegDataCompressor ()
virtual size_t	compress (void *src, size_t srcLen, const TileInfo &tileInfo)
virtual size_t	uncompress (void *dest, size_t destLen, const TileInfo &tileInfo)
virtual SbString	getCompressionFormatName () const
virtual bool	isLossless ()

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Detailed Description

Jpeg data compression

This class implements a compression scheme based on libjpeg. It is a lossy compression.

The setCompressionLevel method (SoDataCompressor or SoConverterParameters) accepts values between 0 and 100. 0 gives best compression but most loss of data. 100 gives minimum compression and minimum data alteration. Default is 85.

Limitations:

• JPEG compression can only be used on 8-bit data sets.

SEE ALSO

SoGzipDataCompressor, SoDataCompressor, SoJp3dDataCompressor, SoConverterParameters

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Constructor & Destructor Documentation

SoJpegDataCompressor::SoJpegDataCompressor

(

)

Constructor.

virtual SoJpegDataCompressor::~SoJpegDataCompressor

(

)

[virtual]

Destructor.

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Member Function Documentation

virtual size_t SoJpegDataCompressor::compress	(	void *	src,
		size_t	srcLen,
		const TileInfo &	tileInfo
	)			[virtual]

Compresses the given buffer into the internal buffer.

Parameters:

	src	a pointer to the data to compress.
	srcLen	the size of the source buffer in bytes.
	tileInfo	contains information about the tile being processed.

Returns:

The size in bytes of the compressed buffer.

Implements SoDataCompressor.

virtual SbString SoJpegDataCompressor::getCompressionFormatName

(

)

const [inline, virtual]

Returns the name of the compression algorithm used by this class.

This is the name the user must pass to the "-c" option of the converter to use this compression ("jpeg" here).

Returns:

An SbString containing "jpeg".

Implements SoDataCompressor.

virtual bool SoJpegDataCompressor::isLossless

(

)

[inline, virtual]

This compression is lossy.

Returns:

false, the compression is lossy.

Implements SoDataCompressor.

virtual size_t SoJpegDataCompressor::uncompress	(	void *	dest,
		size_t	destLen,
		const TileInfo &	tileInfo
	)			[virtual]

Uncompresses data from the internal buffer to the given buffer.

Parameters:

	dest	a pointer to the destination buffer.
	destLen	the size of the destination buffer in bytes.
	tileInfo	contains information about the tile being processed.

Returns:

The number of uncompressed bytes.

Implements SoDataCompressor.

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

• LDM/compressors/SoJpegDataCompressor.h