Listing 2, The x86 Asm Inner Loop
add		edx,[DeltaVFrac]			; add in dVFrac

sbb		ebp,ebp				; store carry
mov		[edi],al				; write pixel n

mov		al,[esi]				; fetch pixel n+1
add		ecx,ebx				; add in dUFrac

adc		esi,[4*ebp + UVStepVCarry]	; add in steps

