/usr/include/dcmtk/dcmimage/dihsvpxt.h is in libdcmtk-dev 3.6.1~20160216-4.
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*
* Copyright (C) 1996-2011, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: dcmimage
*
* Author: Joerg Riesmeier
*
* Purpose: DicomHSVPixelTemplate (Header)
*
*/
#ifndef DIHSVPXT_H
#define DIHSVPXT_H
#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmimage/dicopxt.h"
#include "dcmtk/dcmimgle/diinpx.h" /* gcc 3.4 needs this */
/*---------------------*
* class declaration *
*---------------------*/
/** Template class to handle HSV pixel data
*/
template<class T1, class T2>
class DiHSVPixelTemplate
: public DiColorPixelTemplate<T2>
{
public:
/** constructor
*
** @param docu pointer to DICOM document
* @param pixel pointer to input pixel representation
* @param status reference to status variable
* @param planeSize number of pixels in a plane
* @param bits number of bits per sample
*/
DiHSVPixelTemplate(const DiDocument *docu,
const DiInputPixel *pixel,
EI_Status &status,
const unsigned long planeSize,
const int bits)
: DiColorPixelTemplate<T2>(docu, pixel, 3, status)
{
if ((pixel != NULL) && (this->Count > 0) && (status == EIS_Normal))
convert(OFstatic_cast(const T1 *, pixel->getData()) + pixel->getPixelStart(), planeSize, bits);
}
/** destructor
*/
virtual ~DiHSVPixelTemplate()
{
}
private:
/** convert input pixel data to intermediate representation
*
** @param pixel pointer to input pixel data
* @param planeSize number of pixels in a plane
* @param bits number of bits per sample
*/
void convert(const T1 *pixel,
const unsigned long planeSize,
const int bits)
{
if (this->Init(pixel))
{
register T2 *r = this->Data[0];
register T2 *g = this->Data[1];
register T2 *b = this->Data[2];
const T2 maxvalue = OFstatic_cast(T2, DicomImageClass::maxval(bits));
const T1 offset = OFstatic_cast(T1, DicomImageClass::maxval(bits - 1));
// use the number of input pixels derived from the length of the 'PixelData'
// attribute), but not more than the size of the intermediate buffer
const unsigned long count = (this->InputCount < this->Count) ? this->InputCount : this->Count;
if (this->PlanarConfiguration)
{
/*
register const T1 *h = pixel;
register const T1 *s = h + this->InputCount;
register const T1 *v = s + this->InputCount;
for (i = count; i != 0; --i)
convertValue(*(r++), *(g++), *(b++), removeSign(*(h++), offset), removeSign(*(s++), offset),
removeSign(*(v++), offset), maxvalue);
*/
register unsigned long l;
register unsigned long i = count;
register const T1 *h = pixel;
register const T1 *s = h + planeSize;
register const T1 *v = s + planeSize;
while (i != 0)
{
/* convert a single frame */
for (l = planeSize; (l != 0) && (i != 0); --l, --i)
{
convertValue(*(r++), *(g++), *(b++), removeSign(*(h++), offset), removeSign(*(s++), offset),
removeSign(*(v++), offset), maxvalue);
}
/* jump to next frame start (skip 2 planes) */
h += 2 * planeSize;
s += 2 * planeSize;
v += 2 * planeSize;
}
}
else
{
register const T1 *p = pixel;
register T2 h;
register T2 s;
register T2 v;
register unsigned long i;
for (i = count; i != 0; --i)
{
h = removeSign(*(p++), offset);
s = removeSign(*(p++), offset);
v = removeSign(*(p++), offset);
convertValue(*(r++), *(g++), *(b++), h, s, v, maxvalue);
}
}
}
}
/** convert a single HSV value to RGB
*/
void convertValue(T2 &red,
T2 &green,
T2 &blue,
const T2 hue,
const T2 saturation,
const T2 value,
const T2 maxvalue)
{
/*
* conversion algorithm taken from Foley et al.: 'Computer Graphics: Principles and Practice' (1990)
*/
if (saturation == 0)
{
red = value;
green = value;
blue = value;
}
else
{
const double h = (OFstatic_cast(double, hue) * 6) / (OFstatic_cast(double, maxvalue) + 1); // '... + 1' to assert h < 6
const double s = OFstatic_cast(double, saturation) / OFstatic_cast(double, maxvalue);
const double v = OFstatic_cast(double, value) / OFstatic_cast(double, maxvalue);
const T2 hi = OFstatic_cast(T2, h);
const double hf = h - hi;
const T2 p = OFstatic_cast(T2, maxvalue * v * (1 - s));
const T2 q = OFstatic_cast(T2, maxvalue * v * (1 - s * hf));
const T2 t = OFstatic_cast(T2, maxvalue * v * (1 - s * (1 - hf)));
switch (hi)
{
case 0:
red = value;
green = t;
blue = p;
break;
case 1:
red = q;
green = value;
blue = p;
break;
case 2:
red = p;
green = value;
blue = t;
break;
case 3:
red = p;
green = q;
blue = value;
break;
case 4:
red = t;
green = p;
blue = value;
break;
case 5:
red = value;
green = p;
blue = q;
break;
default:
DCMIMAGE_WARN("invalid value for 'hi' while converting HSV to RGB");
}
}
}
};
#endif
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