a4d9bcf106
Speedup the Color Balance VSE strip modifier, with two things: - Generally, use a much lower overhead parallel_for, also with lower grain size (32 image rows, instead of 64 that were used before). This is what makes the "float" variant faster. - For "byte" variant, create a precalculated lookup table instead of doing all the math per-pixel. This was *almost* done in existing code, except it was put into the code path that was never-ever used. However, since this is all done on premultiplied values, I'm using lookup table size of 1024 instead of 256, so that semitransparent pixels get some more precision for "in-between values". This LUT is what results in the main speedup of "byte" variant. Calculating Color Balance at 4K resolution, times in milliseconds: - PC (Ryzen 5950X), PNG (byte): 22.2 -> 2.9 ms, EXR (float): 20.1 -> 15.2 ms - Mac (M1 Max), PNG (byte): 28.9 -> 7.5 ms, EXR (float): 21.8 -> 8.5 ms More timing details in PR. Pull Request: https://projects.blender.org/blender/blender/pulls/127121
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