public override void GetDisplayInfoByOffset(long off, out int orow, out int obyte, out int ox, out int oy)
{
orow = (int)((off - areaGroup.Offset) / bpr);
obyte = (int)((off - areaGroup.Offset) % bpr);
oy = orow * drawer.Height;
int group = obyte / grouping;
int groupOffset = obyte % grouping;
ox = group * (grouping * dpb * drawer.Width + drawer.Width) + dpb * drawer.Width * groupOffset;
}