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Alex Parker 44258b5ad0 Undo: Improve image undo performance ...

When texture painting a lot of time is spent in ED_image_paint_tile_find.
This fixes stores the PaintTiles in a blender::Map making ED_image_paint_tile_find an O(1) rather than O(n) operation.

When using threading the locking should happen during read as well,
still this gives a boost in performance as the read is now much faster.

Reviewed By: jbakker

Maniphest Tasks: T99546

Differential Revision: https://developer.blender.org/D15415

2022-07-25 08:14:32 +02:00

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