ipa: rkisp1: awb: Add support for RGB means

RkISP actually supports two modes for color means, RGB and YCbCr. The
variables where the means are stored are identically named regardless of
the color means mode that's been selected.

Since the gains are computed in RGB mode, a conversion needs to be done
when the mode is YCbCr, which is unnecessary when RGB mode is selected.

This adds support for RGB means mode too, by checking at runtime which
mode is selected at a given time. The default is still set to YCbCr mode
for now.

Cc: Quentin Schulz <foss+libcamera@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/ipa/rkisp1/algorithms/awb.h b/src/ipa/rkisp1/algorithms/awb.h
index 6d4a3946..d76b5382 100644
--- a/src/ipa/rkisp1/algorithms/awb.h
+++ b/src/ipa/rkisp1/algorithms/awb.h
@@ -16,7 +16,7 @@ namespace ipa::rkisp1::algorithms {
 class Awb : public Algorithm
 {
 public:
-	Awb() = default;
+	Awb();
 	~Awb() = default;
 
 	int configure(IPAContext &context, const IPACameraSensorInfo &configInfo) override;
@@ -32,6 +32,8 @@ public:
 
 private:
 	uint32_t estimateCCT(double red, double green, double blue);
+
+	bool rgbMode_;
 };
 
 } /* namespace ipa::rkisp1::algorithms */