FIXED: Comp over input transformTOP alpha multiplication

It seems that the alpha channel of the bgcolor par on transformTOPs doesn’t multiply against bgcolor[rgb] properly. Bringing the alpha down to zero should effectively get rid of the color, but it doesn’t

Ya, this is an issue we’ve fixed in the 2021.30000 series. We’ve done a bit of an overhaul with out pre-multiplied alpha is handled, so it’s more consistent across the board

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Think we’ll see this trickle into stable soon?

Far too large of a change to make it into 2021.10000 unfortunately. It’ll have to wait until 2021.30000.