osgEarth::ImageToHeightFieldConverter Class Reference

List of all members.

Public Member Functions
	ImageToHeightFieldConverter ()
void	setRemoveNoDataValues (bool value, float fallback=0.0f)
osg::HeightField *	convert (const osg::Image *image)
osg::HeightField *	convert (const osg::Image *image, float scaleFactor)
osg::Image *	convert (const osg::HeightField *hf, int pixelSize=32)
Private Member Functions
osg::HeightField *	convert16 (const osg::Image *image) const
osg::HeightField *	convert32 (const osg::Image *image) const
osg::Image *	convert16 (const osg::HeightField *hf) const
osg::Image *	convert32 (const osg::HeightField *hf) const
Private Attributes
bool	_replace_nodata
float	_nodata_value

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Detailed Description

Utility class that re-interprets an image as a heightfield and vice-versa.

Definition at line 33 of file ImageToHeightFieldConverter.

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Constructor & Destructor Documentation

ImageToHeightFieldConverter::ImageToHeightFieldConverter

(

)

Definition at line 40 of file ImageToHeightFieldConverter.cpp.

                                                        :
_replace_nodata( false ),
_nodata_value( 0.0f )
{
  //NOP
}

---

Member Function Documentation

osg::HeightField * ImageToHeightFieldConverter::convert

(

const osg::Image *

image

)

Converts an image to a heightfield.

Definition at line 54 of file ImageToHeightFieldConverter.cpp.

                                                                           {
  if ( !image ) {
    return NULL;
  }

  osg::HeightField* hf;
  if ( image->getPixelSizeInBits() == 32 ) {
    hf = convert32( image );
  } else {
    hf = convert16( image );
  }

  // scan for and replace NODATA values. This algorithm is terrible but good enough for now
  if ( _replace_nodata )
  {
    for( unsigned int row=0; row < hf->getNumRows(); ++row )
    {
      for( unsigned int col=0; col < hf->getNumColumns(); ++col )
      {
        float val = hf->getHeight(col, row);
        if ( !isNoData( val ) ) {
          continue;
        }
        if ( col > 0 )
          val = hf->getHeight(col-1,row);
        else if ( col <= hf->getNumColumns()-1 )
          val = hf->getHeight(col+1,row);

        if ( isNoData( val ) )
        {
          if ( row > 0 )
            val = hf->getHeight(col, row-1);
          else if ( row < hf->getNumRows()-1 )
            val = hf->getHeight(col, row+1);
        }

        if ( isNoData( val ) )
        {
          val = _nodata_value;
        }

        hf->setHeight( col, row, val );
      }
    }
  }

  return hf;
}

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osg::Image * ImageToHeightFieldConverter::convert	(	const osg::HeightField *	hf,
		int	pixelSize = 32
	)

Converts a heightfield to an image.

Definition at line 153 of file ImageToHeightFieldConverter.cpp.

{
  if ( pixelSize == 32 ) {
    return convert32( hf );
  }

  return convert16( hf );
}

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osg::HeightField * ImageToHeightFieldConverter::convert	(	const osg::Image *	image,
		float	scaleFactor
	)

Definition at line 135 of file ImageToHeightFieldConverter.cpp.

{
  if ( !image ) {
    return NULL;
  }

  osg::HeightField* hf = convert( image );

  // finally, apply the scale factor.
  for( osg::FloatArray::iterator i = hf->getFloatArray()->begin(); i != hf->getFloatArray()->end(); ++i )
  {
    (*i) *= scaleFactor;
  }

  return hf;
}

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osg::HeightField * ImageToHeightFieldConverter::convert16

(

const osg::Image *

image

)

const [private]

Definition at line 103 of file ImageToHeightFieldConverter.cpp.

                                                                                   {
  if ( !image ) {
    return NULL;
  }

  osg::HeightField *hf = new osg::HeightField();
  hf->allocate( image->s(), image->t() );

  osg::FloatArray* floats = hf->getFloatArray();

  for( unsigned int i = 0; i < floats->size(); ++i ) {
    floats->at( i ) = *(short*)image->data(i);
  }

  return hf;
}

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osg::Image * ImageToHeightFieldConverter::convert16

(

const osg::HeightField *

hf

)

const [private]

Definition at line 162 of file ImageToHeightFieldConverter.cpp.

                                                                                {
  if ( !hf ) {
    return NULL;
  }

  osg::Image* image = new osg::Image();
  image->allocateImage(hf->getNumColumns(), hf->getNumRows(), 1, GL_LUMINANCE, GL_SHORT);

  const osg::FloatArray* floats = hf->getFloatArray();

  for( unsigned int i = 0; i < floats->size(); ++i  ) {
    *(short*)image->data(i) = (short)floats->at( i );
  }

  return image;
}

osg::Image * ImageToHeightFieldConverter::convert32

(

const osg::HeightField *

hf

)

const [private]

Definition at line 179 of file ImageToHeightFieldConverter.cpp.

                                                                               {
  if ( !hf ) {
    return NULL;
  }

  osg::Image* image = new osg::Image();
  image->allocateImage(hf->getNumColumns(), hf->getNumRows(), 1, GL_LUMINANCE, GL_FLOAT);

  memcpy( image->data(), &hf->getFloatArray()->front(), sizeof(float) * hf->getFloatArray()->size() );

  return image;
}

osg::HeightField * ImageToHeightFieldConverter::convert32

(

const osg::Image *

image

)

const [private]

Definition at line 120 of file ImageToHeightFieldConverter.cpp.

                                                                                   {
  if ( !image ) {
    return NULL;
  }

  osg::HeightField *hf = new osg::HeightField();
  hf->allocate( image->s(), image->t() );

  memcpy( &hf->getFloatArray()->front(), image->data(), sizeof(float) * hf->getFloatArray()->size() );

  return hf;
}

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void ImageToHeightFieldConverter::setRemoveNoDataValues	(	bool	value,
		float	fallback = 0.0f
	)

Instruct the converter to detect and replace "no data" values. It will try to interpolate the proper value, or fall back on the provided value if the interpolation fails.

Definition at line 48 of file ImageToHeightFieldConverter.cpp.

{
  _nodata_value = f;
  _replace_nodata = which;
}

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Member Data Documentation

float osgEarth::ImageToHeightFieldConverter::_nodata_value [private]

Definition at line 65 of file ImageToHeightFieldConverter.

bool osgEarth::ImageToHeightFieldConverter::_replace_nodata [private]

Definition at line 64 of file ImageToHeightFieldConverter.

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The documentation for this class was generated from the following files:

• /home/cube/sources/osgearth/src/osgEarth/ImageToHeightFieldConverter
• /home/cube/sources/osgearth/src/osgEarth/ImageToHeightFieldConverter.cpp