129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
/*
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*
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* Copyright (C) 1997-2014, OFFIS e.V.
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* All rights reserved. See COPYRIGHT file for details.
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*
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* This software and supporting documentation were developed by
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*
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* OFFIS e.V.
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* R&D Division Health
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* Escherweg 2
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* D-26121 Oldenburg, Germany
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*
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*
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* Module: dcmjpeg
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*
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* Author: Norbert Olges, Marco Eichelberg
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*
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* Purpose: decompression routines of the IJG JPEG library configured for 12 bits/sample.
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*
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*/
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#ifndef DJDIJG12_H
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#define DJDIJG12_H
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#include "dcmtk/config/osconfig.h"
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#include "dcmtk/dcmjpeg/djdecabs.h" /* for class DJDecoder */
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extern "C"
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{
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struct jpeg_decompress_struct;
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}
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class DJCodecParameter;
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/** this class encapsulates the decompression routines of the
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* IJG JPEG library configured for 12 bits/sample.
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*/
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class DCMTK_DCMJPEG_EXPORT DJDecompressIJG12Bit : public DJDecoder
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{
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public:
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/** constructor
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* @param cp codec parameters
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* @param isYBR flag indicating if DICOM photometric interpretation is YCbCr
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*/
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DJDecompressIJG12Bit(const DJCodecParameter& cp, OFBool isYBR);
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/// destructor
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virtual ~DJDecompressIJG12Bit();
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/** initializes internal object structures.
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* Must be called before a new frame is decompressed.
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* @return EC_Normal if successful, an error code otherwise
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*/
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virtual OFCondition init();
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/** suspended decompression routine. Decompresses a JPEG frame
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* until finished or out of data. Can be called with new data
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* until a frame is complete.
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* @param compressedFrameBuffer pointer to compressed input data, must not be NULL
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* @param compressedFrameBufferSize size of buffer, in bytes
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* @param uncompressedFrameBuffer pointer to uncompressed output data, must not be NULL.
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* This buffer must not change between multiple decode() calls for a single frame.
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* @param uncompressedFrameBufferSize size of buffer, in bytes (!)
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* Buffer must be large enough to contain a complete frame.
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* @param isSigned OFTrue, if uncompressed pixel data is signed, OFFalse otherwise
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* @return EC_Normal if successful, EC_Suspend if more data is needed, an error code otherwise.
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*/
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virtual OFCondition decode(
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Uint8 *compressedFrameBuffer,
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Uint32 compressedFrameBufferSize,
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Uint8 *uncompressedFrameBuffer,
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Uint32 uncompressedFrameBufferSize,
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OFBool isSigned);
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/** returns the number of bytes per sample that will be written when decoding.
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*/
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virtual Uint16 bytesPerSample() const
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{
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return OFstatic_cast(Uint16, sizeof(Uint16));
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}
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/** after successful compression,
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* returns the color model of the decompressed image
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*/
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virtual EP_Interpretation getDecompressedColorModel() const
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{
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return decompressedColorModel;
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}
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/** callback function used to report warning messages and the like.
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* Should not be called by user code directly.
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* @param msg_level -1 for warnings, 0 and above for trace messages
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*/
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virtual void emitMessage(int msg_level) const;
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private:
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/// private undefined copy constructor
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DJDecompressIJG12Bit(const DJDecompressIJG12Bit&);
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/// private undefined copy assignment operator
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DJDecompressIJG12Bit& operator=(const DJDecompressIJG12Bit&);
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/// cleans up cinfo structure, called from destructor and error handlers
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void cleanup();
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/// codec parameters
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const DJCodecParameter *cparam;
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/// decompression structure
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jpeg_decompress_struct *cinfo;
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/// position of last suspend
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int suspension;
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/// temporary storage for row buffer during suspension
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void *jsampBuffer;
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/// Flag indicating if DICOM photometric interpretation is YCbCr
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OFBool dicomPhotometricInterpretationIsYCbCr;
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/// color model after decompression
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EP_Interpretation decompressedColorModel;
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};
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#endif
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