/// <summary>
/// Converts bitmap to byte array using external palette.
/// </summary>
public static byte[] LoadBitmap(Bitmap bmp, ImagePalette palette)
{
byte[] result = new byte[bmp.Width * bmp.Height];
var rect = new Rectangle(Point.Empty, bmp.Size);
if (bmp.Palette.Entries.SequenceEqual(palette, ColorComparer.Instance))
{
BitmapData data = bmp.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format8bppIndexed);
for (int y = 0; y < bmp.Height; y++)
{
Marshal.Copy(data.Scan0 + data.Stride * y, result, y * bmp.Width, bmp.Width);
}
bmp.UnlockBits(data);
}
else
{
BitmapData data = bmp.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
for (int y = 0; y < bmp.Height; y++)
{
for (int x = 0; x < bmp.Width; x++)
{
byte b = Marshal.ReadByte(data.Scan0, y * data.Stride + x * 3);
byte g = Marshal.ReadByte(data.Scan0, y * data.Stride + x * 3 + 1);
byte r = Marshal.ReadByte(data.Scan0, y * data.Stride + x * 3 + 2);
result[y * bmp.Width + x] = (byte)palette.GetNearestColorIndex(Color.FromArgb(r, g, b));
}
}
bmp.UnlockBits(data);
}
return(result);
}
