An example method of video processing includes making a first determination, for a conversion between a current block of a video and a bitstream representation of the video, about whether a sample in a neighboring block of the current block is in a same video region as the current block and using the first determination to make a second determination about applicability of a coding tool that uses samples outside the current block to the conversion of the current block. The coding tool comprises an adaptive loop filter (ALF) tool that comprises an ALF classification process and/or an ALF filtering process. The method also includes performing the conversion according to the first determination and the second determination.