LDM/SoVolumeHistogram.h

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**=======================================================================*/
/*=======================================================================
** Author      : T.DUFOUR (May 2004)
**=======================================================================*/

#ifndef  _SO_VOLUME_HISTOGRAM_
#define  _SO_VOLUME_HISTOGRAM_

#ifdef _MSC_VER
#pragma warning( push )
#pragma warning(disable:4251)
#pragma warning(disable:4127)
#endif

#include <Inventor/SbDataType.h>
#include <Inventor/SbLinear.h>
#include <Inventor/helpers/SbDataTypeMacros.h>

#include <Inventor/STL/limits>
#include <Inventor/STL/vector>

class SoBufferObject;
class SoArithmetic;

class  SoVolumeHistogram
{
public:
  SoVolumeHistogram(const SbDataType &dataType);

  ~SoVolumeHistogram();

  void setInputValueRange( double rangeMin, double rangeMax );

  void setUndefinedValue( const double undefinedValue)
  { m_undefinedValue=undefinedValue; }

  double getUndefinedValue() const
  { return m_undefinedValue; };

  size_t getHistoSize() const;

  int64_t* getHistogram();

  int64_t getNumValues(size_t entry);

  int64_t getValue(size_t entry);

  double getValueD(size_t entry);

  int64_t getMinValue() const;

  int64_t getMaxValue() const;

  double getMinValueD() const;

  double getMaxValueD() const;

  double getMax() const;

  double getMin() const;

  int getNumSignificantBits() const;

  inline void addValues(SoBufferObject* values, const int numValues);

  inline void addValues(SoBufferObject* values, const SbVec3i32& arrayDim);

  void addValues(SoBufferObject* values, const SbVec3i32& arrayDim, const SbBox3i32& range);

  void set(const std::vector<int64_t> & histo);

  void set(const std::vector<int64_t>& histo, const std::vector<double>& values);

  template<typename T> inline size_t getEntry(T value) const;

  static void computeMinMax(
    SoBufferObject* valuesBuffer,
    const SbDataType& dataType,
    const SbVec3i32& arrayDim,
    const SbBox3i32& range,
    double& min,
    double& max
    );

  static void computeMinMaxWithUndefined(
    SoBufferObject* valuesBuffer,
    const double undefinedValue,
    const SbDataType& dataType,
    const SbVec3i32& arrayDim,
    const SbBox3i32& range,
    double& min,
    double& max
    );

  static void computeMinMax(
    void* valuesBuffer,
    const SbDataType& dataType,
    const SbVec3i32& arrayDim,
    SbVec2d& minMax);

  static void computeMinMaxWithUndefined(
    void* valuesBuffer,
    const double undefinedValue,
    const SbDataType& dataType,
    const SbVec3i32& arrayDim,
    SbVec2d& minMax
    );

private:
  static void initClass();
  static void exitClass();

private:
  template<typename T> inline size_t getEntryInternal(T value) const;

  template<typename T> inline size_t getEntryCaster(T value) const;

  unsigned int computeNumSignificantBits() const;

  std::vector<int64_t> m_histo;  // histogram
  int64_t  m_valueMin;           // min integer value of the dataset for integer data types
  int64_t  m_valueMax;           // max integer value of the dataset for integer data types
  double   m_valueMinD;          // min integer value of the dataset for floating data types
  double   m_valueMaxD;          // max integer value of the dataset for floating data types
  unsigned int m_numSignificantBits; // number of significant bits, only relevant for integer data types

  SbDataType m_dataType;     // data type
  double m_rangeMin;         // for floating data type.
  double m_rangeMax;         // for floating data type.
  double m_undefinedValue;   // undefined Value.

  // makeStats template
  template <typename T>
  void makeStat(
    const void* values,
    const SbVec3i32& arrayDim,
    const SbBox3i32& range
    );

  static SoArithmetic* s_arithmeticInterface;
};

/*******************************************************************************/
void
SoVolumeHistogram::addValues(SoBufferObject* values, const int numValues)
{
  addValues(values, SbVec3i32(numValues, 1, 1), SbBox3i32(SbVec3i32(0, 0, 0), SbVec3i32(numValues, 1, 1)));
}

/*******************************************************************************/
void SoVolumeHistogram::addValues(SoBufferObject* values, const SbVec3i32& arrayDim)
{
  addValues(values, arrayDim, SbBox3i32(SbVec3i32(0,0,0),arrayDim));
}

/*******************************************************************************/
template<typename T> size_t
SoVolumeHistogram::getEntryInternal(T value) const
{
  assert(m_dataType.isInteger());
  assert(sizeof(T) <= 4);
  size_t offset = 0;
  size_t factor = 1;

  if ( std::numeric_limits<T>::is_signed )
    offset = (sizeof(T) >= 2) ? 0x8000 : 0x80;

  if ( sizeof(T) == 4 )
    factor = (size_t)0x10000;

  size_t entry = (size_t)(value/int64_t(factor)+int64_t(offset));

  return entry;
}

/*******************************************************************************/
template<typename T> size_t
SoVolumeHistogram::getEntryCaster(T value) const
{
  return getEntryInternal(T(value));
}

/*******************************************************************************/
template<typename T> size_t
SoVolumeHistogram::getEntry(T value) const
{
  size_t ret = 0;

  switch (m_dataType)
  {
  case SbDataType::UNSIGNED_SHORT:
    ret = getEntryInternal<unsigned short>((unsigned short)value);
    break;
  case SbDataType::UNSIGNED_INT32:
    ret = getEntryInternal<uint32_t>((uint32_t)value);
    break;
  case SbDataType::SIGNED_BYTE:
    ret = getEntryInternal<signed char>((signed char)value);
    break;
  case SbDataType::SIGNED_SHORT:
    ret = getEntryInternal<signed short>((signed short)value);
    break;
  case SbDataType::SIGNED_INT32:
    ret = getEntryInternal<int32_t>((int32_t)value);
    break;
  case SbDataType::FLOAT:
    ret = getEntryInternal<float>((float)value);
    break;
  case SbDataType::UNSIGNED_BYTE:
    ret = getEntryInternal<unsigned char>((unsigned char)value);
    break;
  case SbDataType::DOUBLE:
    ret = getEntryInternal<double>((double)value);
    break;
  default:
    assert(0);
    break;
  }

  return ret;
}

/*******************************************************************************/
template<> inline size_t
SoVolumeHistogram::getEntryInternal<float>(float value) const
{
  assert(m_dataType == SbDataType::FLOAT);
  if ( m_rangeMax == m_rangeMin )
    return 0;
  double factorDouble = 0.0f;
  factorDouble = 0xffff / (m_rangeMax - m_rangeMin);
  size_t entry = (size_t)((value-m_rangeMin)*factorDouble);

  return SbMathHelper::Clamp(entry, (size_t)0, (size_t)0xffff);
}

/*******************************************************************************/
template<> inline size_t
SoVolumeHistogram::getEntryInternal<double>(double value) const
{
  assert(m_dataType == SbDataType::DOUBLE);
  if ( m_rangeMax == m_rangeMin )
    return 0;
  double factorDouble = 0.0f;
  factorDouble = 0xffff / (m_rangeMax - m_rangeMin);
  size_t entry = (size_t)((value-m_rangeMin)*factorDouble);

  return SbMathHelper::Clamp(entry, (size_t)0, (size_t)0xffff);
}

#ifdef _MSC_VER
#pragma warning( pop )
#endif

#endif /* _SO_VOLUME_HISTOGRAM_ */

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Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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