public void Filter(IPixelBlock pPixelBlock)
{
try
{
IPixelBlock3 pPixelBlock3 = (IPixelBlock3)pPixelBlock;
byte[] lookup = new byte[8] {
128, 64, 32, 16, 8, 4, 2, 1
};
//get number of bands
int plane = pPixelBlock.Planes;
//loop through each band
for (int i = 0; i < plane; i++)
{
//get nodata mask array
byte[] outputArray = (byte[])pPixelBlock3.get_NoDataMaskByRef(i);
//loop through each pixel in the pixelblock and do calculation
for (int x = 0; x < pPixelBlock.Width; x++)
{
for (int y = 0; y < pPixelBlock.Height; y++)
{
//get index in the nodata mask byte array
int ind = x + y * (pPixelBlock.Width);
//get nodata mask byte
byte nd = outputArray[ind / 8];
//get pixel value and check if it is nodata
object tempVal = pPixelBlock3.GetVal(i, x, y);
if (tempVal != null) //not nodata pixel
{
//convert pixel value to int and compare with nodata range
int curVal = Convert.ToInt32(tempVal);
if (curVal >= minNodataValue && curVal <= maxNodataValue)
{
outputArray[ind / 8] = (byte)(nd & ~lookup[ind % 8]);
}
}
}
}
//set nodata mask array
pPixelBlock3.set_NoDataMask(i, outputArray);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
