public OctreeNode(int level, OctreeQuantizer parent) //level - level of parent
{
nodes = new OctreeNode[8];
if (level < 7)
{
parent.AddLevelNode(level, this);
}
}
/// <summary>
/// Convert the image to gif with 256 colors
/// </summary>
/// <returns>256 colors gif image</returns>
public Bitmap ToGif()
{
// initialize the color quantizer
OctreeQuantizer quantizer = new OctreeQuantizer();
// initialize the 256 colors palette
List <Color> limitedPalette = new List <Color>();
// scan the image pixels
for (int y = 0; y < Height; y++)
{
for (int x = 0; x < Width; x++)
{
// get the current color
Color c = GetPixel(x, y);
// add the color to the quantizer
quantizer.AddColor(c);
}
}
// limit the colors to 256
limitedPalette = quantizer.GetPalette(256);
// initialize the bitmap memory lock data
int stride = 4 * ((Width * 8 + 31) / 32);
byte[,] b = new byte[Height, stride];
GCHandle gch = GCHandle.Alloc(b, GCHandleType.Pinned);
// create the gif image
using (Bitmap quantizedBmp = new Bitmap(Width, Height, stride, PixelFormat.Format8bppIndexed, gch.AddrOfPinnedObject()))
{
// get the current palette
ColorPalette pal = quantizedBmp.Palette;
// fill the palette with the correct colors
for (int i = 0; i < pal.Entries.Length; i++)
{
// reset the color
pal.Entries[i] = Color.Transparent;
// if we have more colors, we add it
if (i < limitedPalette.Count)
{
pal.Entries[i] = limitedPalette[i];
}
}
// store the palette
quantizedBmp.Palette = pal;
// scan the image
for (int y = 0; y < Height; y++)
{
for (int x = 0; x < Width; x++)
{
// replace the pixel with the new limited palette color
b[y, x] = (byte)Array.FindIndex(quantizedBmp.Palette.Entries, cl => cl == limitedPalette[quantizer.GetPaletteIndex(GetPixel(x, y))]);
// prevent the app from freezing
Application.DoEvents();
}
}
// unlock the bitmap
gch.Free();
// store the gif for future uses
return((Bitmap)quantizedBmp.Clone());
}
}
