/// <summary>
/// Encodes and writes pixel data to the supplied stream
/// </summary>
/// <param name="indexedPixels">
/// Collection of indices of the pixel colours within the active colour
/// table.
/// </param>
/// <param name="outputStream">
/// The stream to write to.
/// </param>
private static void WritePixels(IndexedPixels indexedPixels,
Stream outputStream)
{
LzwEncoder encoder = new LzwEncoder(indexedPixels);
encoder.Encode(outputStream);
}
/// <summary>
/// Converts the supplied image to a collection of pixel indices using
/// the supplied colour table.
/// Only used when the QuantizerType is set to UseSuppliedPalette
/// </summary>
/// <param name="act">The active colour table</param>
/// <param name="image">The image</param>
/// <returns></returns>
private IndexedPixels MakeIndexedPixels(ColourTable act, Image image)
{
int pixelCount = image.Height * image.Width;
string counterText = "Getting indices in colour table";
AddCounter(counterText, pixelCount);
Bitmap bitmap = (Bitmap)image;
IndexedPixels ip = new IndexedPixels();
for (int y = 0; y < image.Height; y++)
{
for (int x = 0; x < image.Width; x++)
{
Color c = bitmap.GetPixel(x, y);
int index = FindClosest(c, act);
ip.Add((byte)index);
MyProgressCounters[counterText].Value = ip.Count;
}
}
RemoveCounter(counterText);
return(ip);
}
