a33730dc0d
IMB_alpha_under_color_[byte/float] functions are used when preparing the rendered image for image/movie output with RGB channels (i.e. no transparency). They were single threaded before, multi-thread them. Time taken by them on 4K resolution image (mix of various transparency values in source), on Ryzen 5950X/Windows: - IMB_alpha_under_color_byte: 10.1ms -> 1.9ms - IMB_alpha_under_color_float: 14.6ms -> 8.8ms (smaller speedup since it becomes memory bandwidth limited) Pull Request: https://projects.blender.org/blender/blender/pulls/135258
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