From e41854a4e6fde2dd9e2a2a7290670943235776cd Mon Sep 17 00:00:00 2001 From: Jean-Michel Hautbois Date: Thu, 24 Feb 2022 16:11:13 +0100 Subject: ipa: ipu3: awb: Clamp gain values The gain values are coded as u3.13 fixed point values, ie they can not be more than 8. Clamp the values in order to avoid any off limits value which could make the IPU3 behave in a weird manner. Signed-off-by: Jean-Michel Hautbois Reviewed-by: Kieran Bingham Signed-off-by: Umang Jain Reviewed-by: Umang Jain --- src/ipa/ipu3/algorithms/awb.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src/ipa/ipu3') diff --git a/src/ipa/ipu3/algorithms/awb.cpp b/src/ipa/ipu3/algorithms/awb.cpp index 1dc27fc9..87a6cc7a 100644 --- a/src/ipa/ipu3/algorithms/awb.cpp +++ b/src/ipa/ipu3/algorithms/awb.cpp @@ -353,6 +353,14 @@ void Awb::awbGreyWorld() /* Color temperature is not relevant in Grey world but still useful to estimate it :-) */ asyncResults_.temperatureK = estimateCCT(sumRed.R, sumRed.G, sumBlue.B); + + /* + * Gain values are unsigned integer value ranging [0, 8) with 13 bit + * fractional part. + */ + redGain = std::clamp(redGain, 0.0, 65535.0 / 8192); + blueGain = std::clamp(blueGain, 0.0, 65535.0 / 8192); + asyncResults_.redGain = redGain; /* Hardcode the green gain to 1.0. */ asyncResults_.greenGain = 1.0; -- cgit v1.2.1