Fill Routine

[boriel]

Update (cleaned up):

Code:

__DECY:       SPPixelDown:
    inc h       inc h
    ld a, h     ld a, h
    and 7       and 7
    ret nz      ret nz
                ld a, h
                sub 8
                ld h, a
    ld a, l     ld a, l
    add a, 32  add a, 32
    ld l, a     ld l, a
    ret c       ret nc
    ld a, h     ld a, h
    sub 8       add a, 8
    ld h, a     ld h, a
    ret         cp $58
                ccf
                ret

I think this one is clearer.
Both this 2 routines do the same. :?: The one on the right seems optimized (It's used in ZX Basic DRAW)