Sergey Sharybin
6c74d4af15
In the tiled compositor ensure_delta() can be called from multiple threads, but without any threading synchronization. This worked fine when the node only supported absolute transform: multiple threads would do the same work and assign delta to the same values. With the addition of relative transform in #115947 a code which adjusts previously calculated delta was added, leading to possible double-applying relative transform. The solution is to avoid multiple threads modifying the same data by using a double-locked check. This issue does not happen in 4.2 (main branch) because it switched to full frame compositor, which works differently. Pull Request: https://projects.blender.org/blender/blender/pulls/119883
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