ipa: rkisp1: Add GammaOutCorrection algorithm

Add a gamma algorithm for the rkisp1. It defaults to a gamma of 2.2 which
closely resembles sRGB.  No seperate sRGB mode was implemented because the pwl
that models the gamma curve is so coarse that there is basically no difference
between srgb and gamma=2.2. The default can be overridden within the tuning
file or set at runtime using the gamma control.

The gamma algorithm is not enabled by default. This will be done in future
tuning file updates.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index bd02a7a2..2a994d81 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -104,6 +104,10 @@ struct IPAActiveState {
 		uint8_t denoise;
 		uint8_t sharpness;
 	} filter;
+
+	struct {
+		double gamma;
+	} goc;
 };
 
 struct IPAFrameContext : public FrameContext {
@@ -143,6 +147,11 @@ struct IPAFrameContext : public FrameContext {
 	} filter;
 
 	struct {
+		double gamma;
+		bool update;
+	} goc;
+
+	struct {
 		uint32_t exposure;
 		double gain;
 	} sensor;