87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/*
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*
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* Copyright (C) 1997-2011, 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: Marco Eichelberg, Norbert Olges
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*
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* Purpose: Codec class for encoding JPEG Progressive (lossy, 8/12-bit)
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*
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*/
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#ifndef DJENCPRO_H
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#define DJENCPRO_H
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#include "dcmtk/config/osconfig.h"
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#include "dcmtk/dcmjpeg/djcodece.h" /* for class DJCodecEncoder */
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/** Encoder class for JPEG Progressive (lossy, 8/12-bit)
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*/
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class DCMTK_DCMJPEG_EXPORT DJEncoderProgressive : public DJCodecEncoder
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{
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public:
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/// default constructor
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DJEncoderProgressive();
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/// destructor
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virtual ~DJEncoderProgressive();
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/** returns the transfer syntax that this particular codec
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* is able to encode and decode.
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* @return supported transfer syntax
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*/
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virtual E_TransferSyntax supportedTransferSyntax() const;
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private:
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/** returns true if the transfer syntax supported by this
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* codec is lossless.
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* @return lossless flag
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*/
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virtual OFBool isLosslessProcess() const;
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/** creates 'derivation description' string after encoding.
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* @param toRepParam representation parameter passed to encode()
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* @param cp codec parameter passed to encode()
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* @param bitsPerSample bits per sample of the original image data prior to compression
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* @param ratio image compression ratio. This is not the "quality factor"
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* but the real effective ratio between compressed and uncompressed image,
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* i. e. 30 means a 30:1 lossy compression.
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* @param imageComments image comments returned in this
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* parameter which is initially empty
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*/
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virtual void createDerivationDescription(
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const DcmRepresentationParameter * toRepParam,
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const DJCodecParameter *cp,
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Uint8 bitsPerSample,
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double ratio,
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OFString& derivationDescription) const;
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/** creates an instance of the compression library to be used
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* for encoding/decoding.
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* @param toRepParam representation parameter passed to encode()
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* @param cp codec parameter passed to encode()
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* @param bitsPerSample bits per sample for the image data
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* @return pointer to newly allocated codec object
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*/
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virtual DJEncoder *createEncoderInstance(
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const DcmRepresentationParameter * toRepParam,
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const DJCodecParameter *cp,
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Uint8 bitsPerSample) const;
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};
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#endif
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