diinpxt.h

转化为DIB位图再显示出来的dicom文件C++代码

/*
 *
 *  Copyright (C) 1996-2005, OFFIS
 *
 *  This software and supporting documentation were developed by
 *
 *    Kuratorium OFFIS e.V.
 *    Healthcare Information and Communication Systems
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *  THIS SOFTWARE IS MADE AVAILABLE,  AS IS,  AND OFFIS MAKES NO  WARRANTY
 *  REGARDING  THE  SOFTWARE,  ITS  PERFORMANCE,  ITS  MERCHANTABILITY  OR
 *  FITNESS FOR ANY PARTICULAR USE, FREEDOM FROM ANY COMPUTER DISEASES  OR
 *  ITS CONFORMITY TO ANY SPECIFICATION. THE ENTIRE RISK AS TO QUALITY AND
 *  PERFORMANCE OF THE SOFTWARE IS WITH THE USER.
 *
 *  Module:  dcmimgle
 *
 *  Author:  Joerg Riesmeier
 *
 *  Purpose: DicomInputPixelTemplate (Header)
 *
 *  Last Update:      $Author: meichel $
 *  Update Date:      $Date: 2005/12/08 16:47:44 $
 *  CVS/RCS Revision: $Revision: 1.30 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */


#ifndef DIINPXT_H
#define DIINPXT_H

#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/dctypes.h"
#include "dcmtk/dcmdata/dcpixel.h"

#include "dcmtk/ofstd/ofbmanip.h"
#include "dcmtk/ofstd/ofcast.h"

#include "dcmtk/dcmimgle/diinpx.h"
#include "dcmtk/dcmimgle/dipxrept.h"
#include "dcmtk/dcmimgle/diutils.h"


/*--------------------*
 *  helper functions  *
 *--------------------*/

static inline Uint8 expandSign(const Uint8 Value,
                               const Uint8,
                               const Uint8)
{
    return Value;
}


static inline Uint16 expandSign(const Uint16 Value,
                                const Uint16,
                                const Uint16)
{
    return Value;
}


static inline Uint32 expandSign(const Uint32 Value,
                                const Uint32,
                                const Uint32)
{
    return Value;
}


static inline Sint8 expandSign(const Sint8 Value,
                               const Sint8 SignBit,
                               const Sint8 SignMask)
{
    return (Value & SignBit) ? (Value | SignMask) : Value;
}


static inline Sint16 expandSign(const Sint16 Value,
                                const Sint16 SignBit,
                                const Sint16 SignMask)
{
    return (Value & SignBit) ? (Value | SignMask) : Value;
}


static inline Sint32 expandSign(const Sint32 Value,
                                const Sint32 SignBit,
                                const Sint32 SignMask)
{
    return (Value & SignBit) ? (Value | SignMask) : Value;
}


static Uint32 getPixelData(DcmPixelData *PixelData,
                           Uint8 *&pixel)
{
    PixelData->getUint8Array(pixel);
    return PixelData->getLength();
}


static Uint32 getPixelData(DcmPixelData *PixelData,
                           Uint16 *&pixel)
{
    PixelData->getUint16Array(pixel);
    return PixelData->getLength();
}


/*---------------------*
 *  class declaration  *
 *---------------------*/

/** Template class to convert DICOM pixel stream to intermediate representation
 */
template<class T1, class T2>
class DiInputPixelTemplate
  : public DiInputPixel,
    public DiPixelRepresentationTemplate<T2>
{

 public:

    /** constructor
     *
     ** @param  pixel   pointer to DICOM dataset element containing the pixel data
     *  @param  alloc   number of bits allocated for each pixel
     *  @param  stored  number of bits stored for each pixel
     *  @param  high    position of bigh bit within bits allocated
     *  @param  start   start position of pixel data to be processed
     *  @param  count   number of pixels to be processed
     */
    DiInputPixelTemplate(/*const*/ DcmPixelData *pixel,
                         const Uint16 alloc,
                         const Uint16 stored,
                         const Uint16 high,
                         const unsigned long start,
                         const unsigned long count)
      : DiInputPixel(stored, start, count),
        Data(NULL)
    {
        MinValue[0] = 0;
        MinValue[1] = 0;
        MaxValue[0] = 0;
        MaxValue[1] = 0;
        if (this->isSigned())
        {
            AbsMinimum = -OFstatic_cast(double, DicomImageClass::maxval(Bits - 1, 0));
            AbsMaximum = OFstatic_cast(double, DicomImageClass::maxval(Bits - 1));
        } else {
            AbsMinimum = 0;
            AbsMaximum = OFstatic_cast(double, DicomImageClass::maxval(Bits));
        }
        if (pixel != NULL)
            convert(pixel, alloc, stored, high);
        if ((PixelCount == 0) || (PixelStart + PixelCount > Count))         // check for corrupt pixel length
            PixelCount = Count - PixelStart;
    }

    /** destructor
     */
    virtual ~DiInputPixelTemplate()
    {
        delete[] Data;
    }

    /** determine minimum and maximum pixel value
     *
     ** @return status, true if successful, false otherwise
     */
    int determineMinMax()
    {
        if (Data != NULL)
        {
            register T2 *p = Data;
            register unsigned long i;
            const unsigned long ocnt = OFstatic_cast(unsigned long, getAbsMaxRange());
            Uint8 *lut = NULL;
            if ((sizeof(T2) <= 2) && (Count > 3 * ocnt))               // optimization criteria
            {
                lut = new Uint8[ocnt];
                if (lut != NULL)
                {
                    OFBitmanipTemplate<Uint8>::zeroMem(lut, ocnt);
                    register Uint8 *q = lut - OFstatic_cast(T2, getAbsMinimum());
                    for (i = Count; i != 0; --i)                       // fill lookup table
                        *(q + *(p++)) = 1;
                    q = lut;
                    for (i = 0; i < ocnt; ++i)                         // search for minimum
                    {
                        if (*(q++) != 0)
                        {
                            MinValue[0] = OFstatic_cast(T2, OFstatic_cast(double, i) + getAbsMinimum());
                            break;
                        }
                    }
                    q = lut + ocnt;
                    for (i = ocnt; i != 0; --i)                        // search for maximum
                    {
                        if (*(--q) != 0)
                        {
                            MaxValue[0] = OFstatic_cast(T2, OFstatic_cast(double, i - 1) + getAbsMinimum());
                            break;
                        }
                    }
                    if (Count >= PixelCount)                           // use global min/max value
                    {
                        MinValue[1] = MinValue[0];
                        MaxValue[1] = MaxValue[0];
                    } else {                                           // calculate min/max for selected range
                        OFBitmanipTemplate<Uint8>::zeroMem(lut, ocnt);
                        p = Data + PixelStart;
                        q = lut - OFstatic_cast(T2, getAbsMinimum());
                        for (i = PixelCount; i != 0; --i)                  // fill lookup table
                            *(q + *(p++)) = 1;
                        q = lut;
                        for (i = 0; i < ocnt; ++i)                         // search for minimum
                        {
                            if (*(q++) != 0)
                            {
                                MinValue[1] = OFstatic_cast(T2, OFstatic_cast(double, i) + getAbsMinimum());
                                break;
                            }
                        }
                        q = lut + ocnt;
                        for (i = ocnt; i != 0; --i)                         // search for maximum
                        {
                            if (*(--q) != 0)
                            {
                                MaxValue[1] = OFstatic_cast(T2, OFstatic_cast(double, i - 1) + getAbsMinimum());
                                break;
                            }
                        }
                    }
                }
            }
            if (lut == NULL)                                           // use conventional method
            {
                register T2 value = *p;
                MinValue[0] = value;
                MaxValue[0] = value;
                for (i = Count; i > 1; --i)
                {
                    value = *(++p);
                    if (value < MinValue[0])
                        MinValue[0] = value;
                    else if (value > MaxValue[0])
                        MaxValue[0] = value;
                }
                if (Count <= PixelCount)                               // use global min/max value
                {
                    MinValue[1] = MinValue[0];
                    MaxValue[1] = MaxValue[0];
                } else {                                               // calculate min/max for selected range
                    p = Data + PixelStart;
                    value = *p;
                    MinValue[1] = value;
                    MaxValue[1] = value;
                    for (i = PixelCount; i > 1; --i)
                    {
                        value = *(++p);
                        if (value < MinValue[1])
                            MinValue[1] = value;
                        else if (value > MaxValue[1])
                            MaxValue[1] = value;
                    }
                }
            }
            delete[] lut;
            return 1;
        }
        return 0;
    }

    /** get pixel representation
     *
     ** @return pixel representation
     */
    inline EP_Representation getRepresentation() const
    {
        return DiPixelRepresentationTemplate<T2>::getRepresentation();
    }

    /** get pointer to input pixel data
     *
     ** @return pointer to input pixel data
     */
    inline const void *getData() const
    {
        return OFstatic_cast(const void *, Data);
    }

    /** get reference to pointer to input pixel data
     *
     ** @return reference to pointer to input pixel data
     */
    virtual void *getDataPtr()
    {
        return OFstatic_cast(void *, Data);
    }

    /** remove reference to (internally handled) pixel data
     */
    inline void removeDataReference()
    {
        Data = NULL;
    }

    /** get minimum pixel value
     *
     ** @param  idx  specifies whether to return the global minimum (0) or
     *               the minimum of the selected pixel range (1, see PixelStart/Range)
     *
     ** @return minimum pixel value
     */
    inline double getMinValue(const int idx) const
    {
        return (idx == 0) ? OFstatic_cast(double, MinValue[0]) : OFstatic_cast(double, MinValue[1]);
    }

    /** get maximum pixel value
     *
     ** @param  idx  specifies whether to return the global maximum (0) or
     *               the maximum of the selected pixel range (1, see PixelStart/Range)
     *
     ** @return maximum pixel value
     */
    inline double getMaxValue(const int idx) const
    {
        return (idx == 0) ? OFstatic_cast(double, MaxValue[0]) : OFstatic_cast(double, MaxValue[1]);
    }


 private:

    /** convert pixel data from DICOM dataset to input representation
     *
     ** @param  pixelData      pointer to DICOM dataset element containing the pixel data
     *  @param  bitsAllocated  number of bits allocated for each pixel
     *  @param  bitsStored     number of bits stored for each pixel
     *  @param  highBit        position of bigh bit within bits allocated
     */
    void convert(/*const*/ DcmPixelData *pixelData,
                 const Uint16 bitsAllocated,
                 const Uint16 bitsStored,
                 const Uint16 highBit)
    {
        const Uint16 bitsof_T1 = bitsof(T1);
        const Uint16 bitsof_T2 = bitsof(T2);
        T1 *pixel;
        const Uint32 length_Bytes = getPixelData(pixelData, pixel);
        const Uint32 length_T1 = length_Bytes / sizeof(T1);
        Count = ((length_Bytes * 8) + bitsAllocated - 1) / bitsAllocated;