public void Set(int Idx, Color Fg, Color Bg)
{
Idx *= 4;
ForeDataRaw[Idx] = Fg.R;
ForeDataRaw[Idx + 1] = Fg.G;
ForeDataRaw[Idx + 2] = Fg.B;
BackDataRaw[Idx] = Bg.R;
BackDataRaw[Idx + 1] = Bg.G;
BackDataRaw[Idx + 2] = Bg.B;
BackDataRaw[Idx + 3] = Bg.A;
Dirty = true;
}