https://bugs.documentfoundation.org/show_bug.cgi?id=156361

--- Comment #10 from Noel Grandin <[email protected]> ---
(In reply to Patrick Luby from comment #9)
> Thoughts? I can try coding this in the next couple of days and see if it
> fixes anything.

Honestly, I think the best thing to do is to remove this whole troublesome code
block and return false for that routine, falling back to the slow path.
It is not a widely used thing, and modern machines have really good single
threaded performance, and modern compilers will turn that slow path routine
into a chunk of efficient SIMD code.

In the long run, when we have combined alpha, all of this complication will
fall away, and we can use normal GPU optimised blend modes.

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