Re: [fxtf-drafts] [css-compositing-2] Remove plus-darker (#447)

The first problem here is that nobody's published a formula for what Apple's `plus-darker` is that we believe is correct.

For what it's worth, if I were to try to make up a `plus-darker` formula that was the opposite of `plus-lighter` but darkening, I think I'd probably write:

Fa = 1; Fb = 1;
co = max(0, 1 - αs x Cs - αb x Cb);
αo = min(1, αs + αb);

I have not tested to see if this does anything close to reasonable.

(On a related topic, the only difference between `lighter` and `plus-lighter` appears to be the clamping to the [0, 1] range.)

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Received on Thursday, 30 March 2023 00:20:27 UTC