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The abs_diff() function computes the absolute difference of two elements. This may seem trivial at first, but can lead to unexpected results when operating on unsigned operands. A common implementation of the absolute difference of two unsigned int (used through the libcamera code base) is std::abs(static_cast<int>(a - b)) but doesn't return the expected result when either a or b is larger than UINT_MAX / 2 due to overflows. The abs_diff() function offers a safe alternative. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>