DJCompressIJG8Bit Class Reference

this class encapsulates the compression routines of the IJG JPEG library configured for 8 bits/sample. More...

Inheritance diagram for DJCompressIJG8Bit:

Public Member Functions
	DJCompressIJG8Bit (const DJCodecParameter &cp, EJ_Mode mode, Uint8 quality)
	constructor for lossy JPEG
	DJCompressIJG8Bit (const DJCodecParameter &cp, EJ_Mode mode, int prediction, int ptrans)
	constructor for lossless JPEG
virtual	~DJCompressIJG8Bit ()
	destructor
virtual OFCondition	encode (Uint16 columns, Uint16 rows, EP_Interpretation interpr, Uint16 samplesPerPixel, Uint16 *image_buffer, Uint8 *&to, Uint32 &length)
	single frame compression routine for 16-bit raw pixel data.
virtual OFCondition	encode (Uint16 columns, Uint16 rows, EP_Interpretation interpr, Uint16 samplesPerPixel, Uint8 *image_buffer, Uint8 *&to, Uint32 &length)
	single frame compression routine for 8-bit raw pixel data.
virtual Uint16	bytesPerSample () const
	returns the number of bytes per sample that will be expected when encoding.
virtual Uint16	bitsPerSample () const
	returns the number of bits per sample that will be expected when encoding.
void	initDestination (dcmtk_jpeg8_compress_struct *cinfo)
	callback for IJG compress destination manager.
int	emptyOutputBuffer (dcmtk_jpeg8_compress_struct *cinfo)
	callback for IJG compress destination manager.
void	termDestination (dcmtk_jpeg8_compress_struct *cinfo)
	callback for IJG compress destination manager.
virtual void	emitMessage (void *arg, int msg_level) const
	callback function used to report warning messages and the like.
Public Member Functions inherited from DJEncoder
	DJEncoder ()
	default constructor
virtual	~DJEncoder ()
	destructor

Private Member Functions
	DJCompressIJG8Bit (const DJCompressIJG8Bit &)
	private undefined copy constructor
DJCompressIJG8Bit &	operator= (const DJCompressIJG8Bit &)
	private undefined copy assignment operator
void	cleanup ()
	cleans up pixelDataList, called from destructor and error handlers

Private Attributes
const DJCodecParameter *	cparam
	codec parameters
Uint8	quality
	for lossy compression, defines compression quality factor
int	psv
	for lossless compression, defines selection value
int	pt
	for lossless compression, defines point transform
EJ_Mode	modeofOperation
	enum for mode of operation (baseline, sequential, progressive etc.)
OFList< unsigned char * >	pixelDataList
	list of compressed pixel data blocks
size_t	bytesInLastBlock
	filled number of bytes in last block in pixelDataList

Detailed Description

this class encapsulates the compression routines of the IJG JPEG library configured for 8 bits/sample.

Constructor & Destructor Documentation

DJCompressIJG8Bit() [1/2]

DJCompressIJG8Bit::DJCompressIJG8Bit	(	const DJCodecParameter &	cp,
		EJ_Mode	mode,
		Uint8	quality
	)

constructor for lossy JPEG

Parameters

cp	codec parameters
mode	mode of operation
quality	compression quality

DJCompressIJG8Bit() [2/2]

DJCompressIJG8Bit::DJCompressIJG8Bit	(	const DJCodecParameter &	cp,
		EJ_Mode	mode,
		int	prediction,
		int	ptrans
	)

constructor for lossless JPEG

Parameters

cp	codec parameters
prediction	predictor
ptrans	point transform

Member Function Documentation

emitMessage()

virtual void DJCompressIJG8Bit::emitMessage ( void *  arg, int  msg_level  ) const

virtual

callback function used to report warning messages and the like.

Should not be called by user code directly.

Parameters

arg	opaque pointer to JPEG compress structure
msg_level	-1 for warnings, 0 and above for trace messages

emptyOutputBuffer()

int DJCompressIJG8Bit::emptyOutputBuffer

(

dcmtk_jpeg8_compress_struct *

cinfo

)

callback for IJG compress destination manager.

Internal use only, not to be called by client code.

Parameters

cinfo

pointer to compress info

encode() [1/2]

virtual OFCondition DJCompressIJG8Bit::encode ( Uint16  columns, Uint16  rows, EP_Interpretation  interpr, Uint16  samplesPerPixel, Uint16 *  image_buffer, Uint8 *&  to, Uint32 &  length  )

virtual

single frame compression routine for 16-bit raw pixel data.

May only be called if bytesPerSample() == 2.

Parameters

columns	columns of frame
rows	rows of frame
interpr	photometric interpretation of input frame
samplesPerPixel	samples per pixel of input frame
image_buffer	pointer to frame buffer
to	compressed frame returned in this parameter upon success
length	length of compressed frame (in bytes) returned in this parameter upon success; length guaranteed to be always even.

Returns

EC_Normal if successful, an error code otherwise.

Implements DJEncoder.

encode() [2/2]

virtual OFCondition DJCompressIJG8Bit::encode ( Uint16  columns, Uint16  rows, EP_Interpretation  interpr, Uint16  samplesPerPixel, Uint8 *  image_buffer, Uint8 *&  to, Uint32 &  length  )

virtual

single frame compression routine for 8-bit raw pixel data.

May only be called if bytesPerSample() == 1.

Parameters

columns	columns of frame
rows	rows of frame
interpr	photometric interpretation of input frame
samplesPerPixel	samples per pixel of input frame
image_buffer	pointer to frame buffer
to	compressed frame returned in this parameter upon success
length	length of compressed frame (in bytes) returned in this parameter upon success; length guaranteed to be always even.

Returns

EC_Normal if successful, an error code otherwise.

Implements DJEncoder.

initDestination()

void DJCompressIJG8Bit::initDestination

(

dcmtk_jpeg8_compress_struct *

cinfo

)

callback for IJG compress destination manager.

Internal use only, not to be called by client code.

Parameters

cinfo

pointer to compress info

termDestination()

void DJCompressIJG8Bit::termDestination

(

dcmtk_jpeg8_compress_struct *

cinfo

)

callback for IJG compress destination manager.

Internal use only, not to be called by client code.

Parameters

cinfo

pointer to compress info

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

• dcmjpeg/include/dcmtk/dcmjpeg/djeijg8.h