TGE.Color[] GetColorTable(Bitmap bmp)
{
BitmapData bitmapData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
int bytesPerPixel = 4;
int byteCount = bitmapData.Stride * bmp.Height;
byte[] bytes = new byte[byteCount];
IntPtr ptrFirstPixel = bitmapData.Scan0;
Marshal.Copy(ptrFirstPixel, bytes, 0, bytes.Length);
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
TGE.Color[] colors = new TGE.Color[bmp.Width * bmp.Height];
for (int y = 0; y < heightInPixels; y++)
{
int currentLine = y * bitmapData.Stride;
for (int x = 0; x < widthInBytes; x += bytesPerPixel)
{
byte B = bytes[currentLine + x];
byte G = bytes[currentLine + x + 1];
byte R = bytes[currentLine + x + 2];
colors[x / bytesPerPixel + y * Width] = TGE.Color.FromArgb(R, G, B);
}
}
bmp.UnlockBits(bitmapData);
return(colors.Distinct().ToArray());
}
short GetClosestColorIndex(TGE.Color c)
{
short closestColorIndex = 0;
float closestDist = float.MaxValue;
for (short i = 0; i < ColorTable.Length; i++)
{
float dist = GetColorSqrDist(ColorTable[i], c);
if (dist < closestDist)
{
closestColorIndex = i;
closestDist = dist;
}
}
return(closestColorIndex);
}
float GetColorSqrDist(TGE.Color c1, TGE.Color c2)
{
return((((c2.R - c1.R) * 0.30f) * ((c2.R - c1.R) * 0.30f)) + (((c2.G - c1.G) * 0.30f) * ((c2.G - c1.G) * 0.30f)) + (((c2.B - c1.B) * 0.30f) * ((c2.B - c1.B) * 0.30f)));
}
