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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-12-06 16:21:19 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-12-07 19:09:31 +0200
commitf413f944d789911c9ded831ac45a7674c129ceba (patch)
treec09d9d0e96e9e504d3a35c7d02e5c31d33908b1b /src/qcam/assets
parent72679c682eb0b9f03948f258a26f78c037d33c48 (diff)
libcamera: base: utils: Add abs_diff() utility function
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>
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