dccodec.h

转化为DIB位图再显示出来的dicom文件C++代码

  /** registers a codec object in the global list of codecs consulted by dcmdata
   *  whenever conversion to/from compressed transfer syntaxes is requested.
   *  This function must not be called before main() is started, e.g. from
   *  a constructor of a global object.
   *  This call is safe in multi-thread operations.
   *  @param aCodec pointer to codec object.  
   *    Must remain unmodified and valid until the codec has been deregistered. 
   *  @param aDefaultRepParam default representation parameter. 
   *    Must remain unmodified and valid until the codec has been deregistered. 
   *  @param aCodecParameter codec parameter. 
   *    Must remain unmodified and valid until the codec has been deregistered or the
   *    parameter has been replaced by a call to updateCodecParameter()
   *  @return EC_Normal if successful, an error code otherwise
   */
  static OFCondition registerCodec(
    const DcmCodec *aCodec,  
    const DcmRepresentationParameter *aDefaultRepParam,
    const DcmCodecParameter *aCodecParameter);

  /** deregisters a codec and it's parameter objects from the global list.
   *  This call is safe in multi-thread operations.
   *  @param aCodec pointer to registered codec
   *  @return EC_Normal if successful, an error code otherwise
   */
  static OFCondition deregisterCodec(const DcmCodec *aCodec);
    
  /** updates the codec parameters object for a codec that has been registered before.
   *  This call is safe in multi-thread operations.
   *  @param aCodec pointer to codec object that has been registered before
   *  @param aCodecParameter codec parameter. 
   *    Must remain unmodified and valid until the codec has been deregistered or the
   *    parameter has been replaced by another call to updateCodecParameter()
   *  @return EC_Normal if successful, an error code otherwise
   */
  static OFCondition updateCodecParameter(
    const DcmCodec *aCodec,
    const DcmCodecParameter *aCodecParameter);

  /** looks for a codec that is able to decode from the given transfer syntax
   *  and calls the decode() method of the codec.  A read lock on the list of
   *  codecs is acquired until this method returns.
   *  @param fromType transfer syntax to decode from
   *  @param fromParam representation parameter of current compressed
   *    representation, may be NULL.
   *  @param fromPixSeq compressed pixel sequence
   *  @param uncompressedPixelData uncompressed pixel data stored in this element
   *  @param pixelStack stack pointing to the location of the pixel data
   *    element in the current dataset.
   *  @return EC_Normal if successful, an error code otherwise.
   */
  static OFCondition decode(
    const DcmXfer & fromType,
    const DcmRepresentationParameter * fromParam,
    DcmPixelSequence * fromPixSeq,
    DcmPolymorphOBOW& uncompressedPixelData,
    DcmStack & pixelStack);

  /** looks for a codec that is able to encode from the given transfer syntax
   *  and calls the encode() method of the codec.  A read lock on the list of
   *  codecs is acquired until this method returns.
   *  @param fromRepType transfer syntax to encode from
   *  @param pixelData pointer to the uncompressed image data in OW format
   *    and local byte order
   *  @param length of the pixel data field in bytes
   *  @param toRepType transfer syntax to compress to
   *  @param toRepParam representation parameter describing the desired
   *    compressed representation (e.g. JPEG quality)
   *  @param pixSeq compressed pixel sequence (pointer to new DcmPixelSequence object
   *    allocated on heap) returned in this parameter upon success.   
   *  @param pixelStack stack pointing to the location of the pixel data
   *    element in the current dataset.
   *  @return EC_Normal if successful, an error code otherwise.
   */
  static OFCondition encode(
    const E_TransferSyntax fromRepType,
    const Uint16 * pixelData,
    const Uint32 length,
    const E_TransferSyntax toRepType,
    const DcmRepresentationParameter * toRepParam,
    DcmPixelSequence * & pixSeq,
    DcmStack & pixelStack);

  /** looks for a codec that is able to transcode (re-compresses)
   *  from the given transfer syntax to the given transfer syntax
   *  and calls the encode() method of the codec.
   *  A read lock on the list of
   *  codecs is acquired until this method returns.
   *  @param fromRepType current transfer syntax of the compressed image
   *  @param fromParam current representation parameter of compressed data, may be NULL
   *  @param fromPixSeq compressed pixel sequence
   *  @param toRepType transfer syntax to compress to
   *  @param toRepParam representation parameter describing the desired
   *    new compressed representation (e.g. JPEG quality)
   *  @param toPixSeq compressed pixel sequence (pointer to new DcmPixelSequence object
   *    allocated on heap) returned in this parameter upon success.   
   *  @param pixelStack stack pointing to the location of the pixel data
   *    element in the current dataset.
   *  @return EC_Normal if successful, an error code otherwise.
   */
  static OFCondition encode(
    const E_TransferSyntax fromRepType,
    const DcmRepresentationParameter * fromParam, 
    DcmPixelSequence * fromPixSeq, 
    const E_TransferSyntax toRepType,
    const DcmRepresentationParameter * toRepParam,
    DcmPixelSequence * & toPixSeq,
    DcmStack & pixelStack);


  /** looks for a codec that claims to be able to convert
   *  between the given transfer syntaxes.
   *  A read lock on the list of
   *  codecs is acquired until this method returns.
   *  @param fromRepType current transfer syntax
   *  @param toRepType desired new transfer syntax
   *  @return true if transformation is supported by a codec, false otherwise.
   */
  static OFBool canChangeCoding(
    const E_TransferSyntax fromRepType,
    const E_TransferSyntax toRepType);

private:

  /** constructor
   *  @param aCodec pointer to codec object.  
   *  @param aDefaultRepParam default representation parameter. 
   *  @param aCodecParameter codec parameter. 
   */
  DcmCodecList(
    const DcmCodec *aCodec,  
    const DcmRepresentationParameter *aDefaultRepParam,
    const DcmCodecParameter *aCodecParameter);

  /// private undefined copy constructor 
  DcmCodecList(const DcmCodecList &);

  /// private undefined copy assignment operator 
  DcmCodecList &operator=(const DcmCodecList &);

  /// pointer to codec object
  const DcmCodec * codec;
  
  /// pointer to default representation parameter
  const DcmRepresentationParameter * defaultRepParam;
  
  /// pointer to codec parameter set
  const DcmCodecParameter * codecParameter;

  /// singleton list of registered codecs
  static OFList<DcmCodecList *> registeredCodecs;
  
#ifdef _REENTRANT
  /// read/write lock guarding access to singleton list
  static OFReadWriteLock codecLock;
#endif

  // dummy friend declaration to prevent gcc from complaining
  // that this class only defines private constructors and has no friends.
  friend class DcmCodecListDummyFriend;
};
 

#endif

/*
** CVS/RCS Log:
** $Log: dccodec.h,v $
** Revision 1.18  2005/12/09 14:48:14  meichel
** Added missing virtual destructors
**
** Revision 1.17  2005/12/08 16:28:01  meichel
** Changed include path schema for all DCMTK header files
**
** Revision 1.16  2004/08/24 14:54:18  meichel
**  Updated compression helper methods. Image type is not set to SECONDARY
**   any more, support for the purpose of reference code sequence added.
**
** Revision 1.15  2003/06/12 13:35:23  joergr
** Fixed inconsistent API documentation reported by Doxygen.
**
** Revision 1.14  2002/05/24 14:51:41  meichel
** Moved helper methods that are useful for different compression techniques
**   from module dcmjpeg to module dcmdata
**
** Revision 1.13  2002/02/27 14:21:20  meichel
** Declare dcmdata read/write locks only when compiled in multi-thread mode
**
** Revision 1.12  2001/11/12 16:29:51  meichel
** Added dummy friend class declaration to singleton class DcmCodecList
**   to keep gcc from squawking.
**
** Revision 1.11  2001/11/08 16:19:39  meichel
** Changed interface for codec registration. Now everything is thread-safe
**   and multiple codecs can be registered for a single transfer syntax (e.g.
**   one encoder and one decoder).
**
** Revision 1.10  2001/09/25 17:19:07  meichel
** Updated abstract class DcmCodecParameter for use with dcmjpeg.
**   Added new function deregisterGlobalCodec().
**
** Revision 1.9  2001/06/01 15:48:34  meichel
** Updated copyright header
**
** Revision 1.8  2001/05/25 09:53:51  meichel
** Modified DcmCodec::decode() interface, required for future dcmjpeg module.
**
** Revision 1.7  2000/09/27 08:19:54  meichel
** Minor changes in DcmCodec interface, required for future dcmjpeg module.
**
** Revision 1.6  2000/04/14 16:09:12  meichel
** Made function DcmCodec and related functions thread safe.
**   registerGlobalCodec() should not be called anymore from the constructor
**   of global objects.
**
** Revision 1.5  2000/03/08 16:26:11  meichel
** Updated copyright header.
**
** Revision 1.4  1999/03/31 09:24:31  meichel
** Updated copyright header in module dcmdata
**
** Revision 1.3  1998/07/15 15:48:43  joergr
** Removed several compiler warnings reported by gcc 2.8.1 with
** additional options, e.g. missing copy constructors and assignment
** operators, initialization of member variables in the body of a
** constructor instead of the member initialization list, hiding of
** methods by use of identical names, uninitialized member variables,
** missing const declaration of char pointers. Replaced tabs by spaces.
**
** Revision 1.2  1997/07/24 13:07:45  andreas
** - Make DcmCodec:canChangeCoding abstract
**
** Revision 1.1  1997/07/21 07:54:57  andreas
** - New environment for encapsulated pixel representations. DcmPixelData
**   can contain different representations and uses codecs to convert
**   between them. Codecs are derived from the DcmCodec class. New error
**   codes are introduced for handling of representations. New internal
**   value representation (only for ident()) for PixelData
** 
*/