/// <summary>
/// Gets the indices of the colours of each of the supplied pixels
/// within the colour table.
/// </summary>
/// <param name="pixelColours">
/// A collection of the colours for which to get the indices in the
/// colour table.
/// </param>
/// <returns>
/// A collection of the indices of the colours of each of the supplied
/// pixels within the colour table.
/// </returns>
private IndexedPixels GetIndexedPixels(Color[] pixelColours)
{
IndexedPixels indexedPixels = new IndexedPixels();
// Take a copy of the distinct colours to make the IndexOf method
// available
string copyDistinctColoursCounterText = "Copying distinct colours";
AddCounter(copyDistinctColoursCounterText, _distinctColours.Count);
Collection <Color> distinctColours = new Collection <Color>();
foreach (Color c in _distinctColours.Keys)
{
MyProgressCounters[copyDistinctColoursCounterText].Value++;
distinctColours.Add(c);
}
RemoveCounter(copyDistinctColoursCounterText);
int indexInColourTable;
int red;
int green;
int blue;
int numberOfPixels = pixelColours.Length;
string indexingPixelsCounterText
= "Mapping colours to indices in colour table";
AddCounter(indexingPixelsCounterText, numberOfPixels);
for (int i = 0; i < numberOfPixels; i++)
{
MyProgressCounters[indexingPixelsCounterText].Value = i;
red = pixelColours[i].R;
green = pixelColours[i].G;
blue = pixelColours[i].B;
// Get the index in the colour table of the colour of this pixel
if (_distinctColours.Count > 256)
{
indexInColourTable = _nq.Map(red, green, blue);
}
else
{
indexInColourTable = distinctColours.IndexOf(pixelColours[i]);
}
indexedPixels.Add((byte)indexInColourTable);
}
RemoveCounter(indexingPixelsCounterText);
return(indexedPixels);
}
