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David Barker authored
Remove the special case handling for the topmost/bottommost rows in each processing unit. This causes slightly different effects depending on whether striped-loop-restoration is enabled. With striped-loop-restoration: Now that we explicitly fill out 3 rows of above/below pixels for each stripe, we don't need to use stepdown_wiener_kernel. Instead, the duplication of the topmost/bottommost pixels accomplishes the same task, while making the code much cleaner. This patch should not cause a change in output, except in a couple of cases which were already questionable. In particular, it fixes bug #953, where the Wiener filter could not handle small processing units (<4 rows high) Without striped-loop-restoration: The Wiener filter returns to using a full 3 pixels above/below the processing unit. In order to make sure there are enough pixels, we need to expand WIENER_BORDER_VERT to 3 pixels. This will result in a slight change in output, but should be fairly minor. BUG=aomedia:953 Change-Id: I9530ef55909246f7ba488b7ecfd92d59e776b2f9
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