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Nuo Mi authored
Previously, the code allowed overwriting on 16-aligned blocks, which was suitable when there were no picture's virtual boundaries because both CTU sizes and strides were 16-aligned. However, with picture's virtual boundaries, each CTU is divided into four ALF blocks, leading to potential issues with overwriting later CTUs. In cases involving picture virtual boundaries, each ALF block is 8-pixel aligned. For luma, we consistently ensure an 8-aligned width. For chroma in 4:2:0 format, we need to account for a 4-aligned width.
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