[css-color] multiplying by a percentage

[ianstormtaylor]

hey tab, i'm mocking up a parser/converter for the color() function, and was running into an issue of not knowing how to treat the multiplication by a percentage. the most natural way to multiply i'd assume would be by a integer/float:

color(rgb(10, 10, 10) red(* 2))

but the spec says that multiplication happens with a percentage only, so would that be the percentage of the current value? aka the above would translate to:

color(rgb(10, 10, 10) red(* 20%))

aka the 20% is 2 of the red channel 10. or would it be a percentage of the possible full channel, aka a percentage of 255?

i could be way overthinking this. thanks for any help!