static IEnumerable <CellMap <T> > GridCells <T>(this GridSpec <T> spec)
where T : struct
{
var bit = 0;
var seg = 0;
var segbits = spec.CellSize;
for (int row = 0, rowbit = 0; row < spec.RowCount; row++)
{
for (var col = 0; col < spec.ColCount; col++, bit++, rowbit++, segbits--)
{
if (segbits == 0)
{
seg++;
segbits = spec.CellSize;
}
var offset = (byte)(spec.CellSize - segbits).Bits;
var pos = CellIndex <T> .Define((ushort)seg, offset);
yield return(new CellMap <T>(pos.Segment, pos.Offset, pos.LinearIndex, row, col));
}
seg++;
segbits = spec.CellSize;
}
}
