ipa: simple: Report contrast in metadata

Provide the requested contrast value, if any, in the metadata to add to
the completed requests.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/simple/algorithms/lut.cpp

@@ -87,9 +87,11 @@ int16_t Lut::ccmValue(unsigned int i, float ccm) const
 
 void Lut::prepare(IPAContext &context,
 		  [[maybe_unused]] const uint32_t frame,
-		  [[maybe_unused]] IPAFrameContext &frameContext,
+		  IPAFrameContext &frameContext,
 		  DebayerParams *params)
 {
+	frameContext.contrast = context.activeState.knobs.contrast;
+
 	/*
 	 * Update the gamma table if needed. This means if black level changes
 	 * and since the black level gets updated only if a lower value is
@@ -139,6 +141,17 @@ void Lut::prepare(IPAContext &context,
 	}
 }
 
+void Lut::process([[maybe_unused]] IPAContext &context,
+		  [[maybe_unused]] const uint32_t frame,
+		  [[maybe_unused]] IPAFrameContext &frameContext,
+		  [[maybe_unused]] const SwIspStats *stats,
+		  ControlList &metadata)
+{
+	const auto &contrast = frameContext.contrast;
+	if (contrast)
+		metadata.set(controls::Contrast, contrast.value());
+}
+
 REGISTER_IPA_ALGORITHM(Lut, "Lut")
 
 } /* namespace ipa::soft::algorithms */

src/ipa/simple/algorithms/lut.h

@@ -30,6 +30,11 @@ public:
 		     const uint32_t frame,
 		     IPAFrameContext &frameContext,
 		     DebayerParams *params) override;
+	void process(IPAContext &context,
+		     const uint32_t frame,
+		     IPAFrameContext &frameContext,
+		     const SwIspStats *stats,
+		     ControlList &metadata) override;
 
 private:
 	void updateGammaTable(IPAContext &context);

src/ipa/simple/ipa_context.h

@@ -74,6 +74,7 @@ struct IPAFrameContext : public FrameContext {
 		double red;
 		double blue;
 	} gains;
+	std::optional<double> contrast;
 };
 
 struct IPAContext {