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

Inheritance diagram for DJDecompressIJG8Bit:

Public Member Functions
	DJDecompressIJG8Bit (const DJCodecParameter &cp, OFBool isYBR)
	constructor More...

virtual	~DJDecompressIJG8Bit ()
	destructor

virtual OFCondition	init ()
	initializes internal object structures. More...

virtual OFCondition	decode (Uint8 compressedFrameBuffer, Uint32 compressedFrameBufferSize, Uint8 uncompressedFrameBuffer, Uint32 uncompressedFrameBufferSize, OFBool isSigned)
	suspended decompression routine. More...

virtual Uint16	bytesPerSample () const
	returns the number of bytes per sample that will be written when decoding.

virtual EP_Interpretation	getDecompressedColorModel () const
	after successful compression, returns the color model of the decompressed image

virtual void	emitMessage (int msg_level) const
	callback function used to report warning messages and the like. More...

Public Member Functions inherited from DJDecoder
	DJDecoder ()
	default constructor

virtual	~DJDecoder ()
	destructor

Private Member Functions
	DJDecompressIJG8Bit (const DJDecompressIJG8Bit &)
	private undefined copy constructor

DJDecompressIJG8Bit &	operator= (const DJDecompressIJG8Bit &)
	private undefined copy assignment operator

void	cleanup ()
	cleans up cinfo structure, called from destructor and error handlers

Private Attributes
const DJCodecParameter *	cparam
	codec parameters

jpeg_decompress_struct *	cinfo
	decompression structure

int	suspension
	position of last suspend

void *	jsampBuffer
	temporary storage for row buffer during suspension

OFBool	dicomPhotometricInterpretationIsYCbCr
	Flag indicating if DICOM photometric interpretation is YCbCr.

EP_Interpretation	decompressedColorModel
	color model after decompression

Detailed Description

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

Constructor & Destructor Documentation

DJDecompressIJG8Bit::DJDecompressIJG8Bit	(	const DJCodecParameter &	cp,
		OFBool	isYBR
	)

constructor

Parameters

cp	codec parameters
isYBR	flag indicating if DICOM photometric interpretation is YCbCr

virtual OFCondition DJDecompressIJG8Bit::decode	(	Uint8 *	compressedFrameBuffer,
		Uint32	compressedFrameBufferSize,
		Uint8 *	uncompressedFrameBuffer,
		Uint32	uncompressedFrameBufferSize,
		OFBool	isSigned
	)

virtual

suspended decompression routine.

Decompresses a JPEG frame until finished or out of data. Can be called with new data until a frame is complete.

Parameters

compressedFrameBuffer	pointer to compressed input data, must not be NULL
compressedFrameBufferSize	size of buffer, in bytes
uncompressedFrameBuffer	pointer to uncompressed output data, must not be NULL. This buffer must not change between multiple decode() calls for a single frame.
uncompressedFrameBufferSize	size of buffer, in bytes (!) Buffer must be large enough to contain a complete frame.
isSigned	OFTrue, if uncompressed pixel data is signed, OFFalse otherwise

Returns: EC_Normal if successful, EC_Suspend if more data is needed, an error code otherwise.

Implements DJDecoder.

virtual void DJDecompressIJG8Bit::emitMessage ( int msg_level ) const

virtual

callback function used to report warning messages and the like.

Should not be called by user code directly.

Parameters

msg_level -1 for warnings, 0 and above for trace messages

virtual OFCondition DJDecompressIJG8Bit::init ( )

virtual

initializes internal object structures.

Must be called before a new frame is decompressed.

Implements DJDecoder.

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