DJDecompressIJG8Bit Class Reference

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

Inheritance diagram for DJDecompressIJG8Bit:

DJDecoder List of all members.

Public Member Functions

 DJDecompressIJG8Bit (const DJCodecParameter &cp, OFBool isYBR)
 constructor
virtual ~DJDecompressIJG8Bit ()
 destructor
virtual OFCondition init ()
 initializes internal object structures.
virtual OFCondition decode (Uint8 *compressedFrameBuffer, Uint32 compressedFrameBufferSize, Uint8 *uncompressedFrameBuffer, Uint32 uncompressedFrameBufferSize, OFBool isSigned)
 suspended decompression routine.
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 outputMessage () const
 callback function used to report warning messages and the like.

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.

Definition at line 50 of file djdijg8.h.

Constructor & Destructor Documentation

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

constructor

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

Member Function Documentation

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 OFCondition DJDecompressIJG8Bit::init (   )  [virtual]
 

initializes internal object structures.

Must be called before a new frame is decompressed.

Returns:
EC_Normal if successful, an error code otherwise

Implements DJDecoder.

virtual void DJDecompressIJG8Bit::outputMessage (   )  const [virtual]
 

callback function used to report warning messages and the like.

Should not be called by user code directly.

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

Generated on 20 Dec 2005 for OFFIS DCMTK Version 3.5.4 by Doxygen 1.4.5