Frank a45306b141 blur speedup ...

it seems that SEGMENT.blur() is the main bottleneck for many 2D effects.

This change optimizes performance of the function:
* avoid to re-write unchanged pixels
* early exit when blur_amount == 0 (=nothing to do)
* use _fast_ types where possible

I've seen up to 20% speedup with this change.

2023-07-08 20:06:52 +02:00

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