Changes

* A new byte is fetched only when the pixels for that byte have been usedexhausted. For an odd number Therefore for 2bpp is NX is not a multiple of pixels in 4 and for 2bpp NX is not a mode such as 2bpp or 4bpp, this means multiple of 2 then the remaining pixels from a the byte will be used on the end of the line and the remainder of the pixels are used for the next line.