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Description:
As described in issue #5789
Changes proposed:
Fix out by 1 error, so pixel row 0 swaps with row (height -1) not (height) and vice-versa.
Also simplified code & reduced calculations by pre-computing the start and end indices.
Testing
Before fix: I took a screenshot from the Anime UI example and opened in Paint. You can see a single layer of blank pixels at the top of the image:
After fix: no blank row of pixels at the top or bottom of the image: