afe13175da
Bezier handles are recalculated in many places in the animation code. Threading that code can give a performance boost all over Blender. This patch only threads a part of the handle calculation code. `BKE_nurb_handle_smooth_fcurve` can still be run in parallel, but that's more complicated, so not done in this PR. Overall this patch mostly benefits code paths that are not already threaded. ------ Performance delta | Action | Before | After | | - | - | - | | `recalcData_graphedit` moving a single key | 1.06 ms | 1.0 ms | | `recalcData_graphedit` moving 300 keys of a single FCurve | 1.6 ms | 1.4 ms | | `recalcData_graphedit` moving 300 keys of multiple FCurves | 60 ms | 55 ms | | `ANIM_animdata_update` when using the Breakdown operator in the GE | 90 ms | 73 ms | Test file used https://download.blender.org/ftp/sybren/animation-rigging/heavy_mocap_test.blend Pull Request: https://projects.blender.org/blender/blender/pulls/119388
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