id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
840	CCALF with Tiles, Slices, Virtual Boundaries	bheng		"
The CCALF code in the ""isCrossedByVirtualBoundaries"" section of AdaptiveLoopFilter::ALFProcess( ) seems to be incorrect.

First, the pointer to the luma source block is derived as follows, which uses the chroma size and is missing an xPos/yPos offset.

  const Area blkSrc(0, 0, w >> chromaScaleX, h >> chromaScaleY);

I believe changing this to something like the following may work:

  const Area blkSrc(xPos, yPos, width, height);


Second, the CCALF code seems to ignore all the boundaries.  The original luma buffer is used rather than a extracted/padded version.  So, the filtering uses luma pixels across these boundaries."	defect	closed	minor	VTM-8.0	VTM	VTM-7.1	fixed		ksuehring XiangLi fbossen jvet@…