JPEGCompressor Class Reference

Wrapper class to the IJG JPEG library. More...

#include <JPEGCompressor.h>

Public Member Functions
	JPEGCompressor (int quality)
	Constructor.
void	setQuality (int factor)
	Set the compression quality.
int	getQuality ()
	Get the current quality level.
void	InitCompression (RawTile &rawtile, unsigned int strip_height) throw (std::string)
	Initialise strip based compression.
unsigned int	CompressStrip (unsigned char *s, unsigned int tile_height) throw (std::string)
	Compress a strip of image data.
unsigned int	Finish () throw (std::string)
	Finish the strip based compression and free memory.
int	Compress (RawTile &t) throw (std::string)
	Compress an entire buffer of image data at once in one command.
unsigned int	getHeaderSize ()
	Return the JPEG header size.
unsigned char *	getHeader ()
	Return a pointer to the header itself.

Detailed Description

Wrapper class to the IJG JPEG library.

Constructor & Destructor Documentation

JPEGCompressor::JPEGCompressor ( int  quality )

inline

Constructor.

Parameters

quality

JPEG Quality factor (0-100)

Member Function Documentation

int JPEGCompressor::Compress

(

RawTile &

t

)

throw (std::string)

Compress an entire buffer of image data at once in one command.

Parameters

t	tile of image data

unsigned int JPEGCompressor::CompressStrip	(	unsigned char *	s,
		unsigned int	tile_height
	)		throw (std::string)

Compress a strip of image data.

Parameters

s	source image data
tile_height	pixel height of the tile we are compressing

void JPEGCompressor::InitCompression	(	RawTile &	rawtile,
		unsigned int	strip_height
	)		throw (std::string)

Initialise strip based compression.

If we are doing a strip based encoding, we need to first initialise with InitCompression, then compress a single strip at a time using CompressStrip and finally clean up using Finish

Parameters

rawtile	tile containing the image to be compressed
strip_height	pixel height of the strip we want to compress

void JPEGCompressor::setQuality ( int  factor )

inline

Set the compression quality.

Parameters

factor

Quality factor (0-100)

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

• JPEGCompressor.h