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If it is digital, then you can shift left 8 times to for multiply by 256 then subtract by x. So mathematically this is x*256 - x = x*(256 - 1) = x*255 .
there is an official name for this kind of logic alled "canonical signed digit".
that is, for this kind of "constant * variable", you can pretty much convert this form into a series of adder and substractor instead of using an multiplier. For certain types of constants, it will save a lot of areas. The optimal form is called "cononical signed digit".
Just like what heyheyhey replied, his form is cononical.
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