Reducing size of scan space of TILE when coloring a pixel

[AnanayG]

When a color is filled in at point (x,y) in the array,
all the points obeying the symmetry rules are calculated.

These points are recalculated when the input space is spanned over the full tile.
This span can be reduced to 2/2 or 1/4 or 1/8 of the tile if certain symmetry conditions are met.

This can potentially have a 2X/4X/8X improvement.