5c32b9ad38
Before we always did a float conversion of the colors even if we wouldn't use the result. Because the float conversion does alpha premultiplication, we can use some shortcuts to skip a lot of computations In a edit with a lot of fully transparent pixels, I observed a reduction in total render time from 1m 31s to 1m 17s. Pull Request: https://projects.blender.org/blender/blender/pulls/117134