4ec0cce30a
Saving files could take ~3-4 seconds on debug builds because of new imbuf scaling logic. Even though debug performance usually isn't much of a consideration, it gets in the way of development. Since thumbnails don't require the same accuracy as the sequencer or compositor, use a faster scaling method that uses a box-filter clamped to integer bounds & integer math. In practice the difference between the resulting thumbnails isn't noticeable in my tests. For debug build with ASAN this gives a ~25x speedup, for release builds it gives a ~1.4x speedup which is to be expected with a more approximate scaling method.
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