Follow-up Comment #3, bug #22247 (project gnustep):
Added a conversion to pre-multiplied in the draw method of NSBitmapImageRep.
This does not catch all cases, but most.
I failed to find a way of removing the obsolete division of alpha and later
multiplication in the render_alpha drawing path. I am still sure that
duplicate efforts happen here, but the code is still to complex for me to
understand. Perhaps I could split the render_alpha methods up in two cases one
for pre-multiplied input and another for unpre-multiplied, but this is to much
effort for now and I give up.
Not sure, whether I should close this bug report now or leave it open...
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