[fxtf-drafts] [compositing] non-premultiplied compositing missing the alpha of source

axinging has just created a new issue for https://github.com/w3c/fxtf-drafts:

== [compositing] non-premultiplied compositing missing the alpha of source ==
The following equation missing "as" before B(Cb, Cs)): 
_now substitute the result of blending for Cs:
    αo x Co = αs x ((1 - αb) x Cs + αb x B(Cb, Cs)) + (1 - αs) x αb x Cb
            = αs x (1 - αb) x Cs + αs x αb x B(Cb, Cs) + (1 - αs) x αb x Cb_

Should be:
_now substitute the result of blending for Cs:
    αo x Co = αs x ((1 - αb) x Cs + **αs x** αb x B(Cb, Cs)) + (1 - αs) x αb x Cb
            = αs x (1 - αb) x Cs + αs x αb x B(Cb, Cs) + (1 - αs) x αb x Cb_

https://drafts.fxtf.org/compositing-1/#simplealphacompositing


Please view or discuss this issue at https://github.com/w3c/fxtf-drafts/issues/258 using your GitHub account