[PATCH 08/10] ipa: rkisp1: Add parseStatistics() to Agc

[Daniel Scally]

In preparation for switching the RkISP1 Agc to a derivation of
MeanLuminanceAgc, add a function that parses the statistics and
stores the values for easy retrieval later.

Signed-off-by: Daniel Scally <dan.scally at ideasonboard.com>
---
 src/ipa/rkisp1/algorithms/agc.cpp | 10 ++++++++++
 src/ipa/rkisp1/algorithms/agc.h   |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp
index 47a6f7b2..d380194d 100644
--- a/src/ipa/rkisp1/algorithms/agc.cpp
+++ b/src/ipa/rkisp1/algorithms/agc.cpp
@@ -373,6 +373,16 @@ void Agc::fillMetadata(IPAContext &context, IPAFrameContext &frameContext,
 	metadata.set(controls::FrameDuration, frameDuration.get<std::micro>());
 }
 
+void Agc::parseStatistics(const rkisp1_stat_buffer *stats,
+			  IPAContext &context)
+{
+	const rkisp1_cif_isp_stat *params = &stats->params;
+
+	expMeans_ = { params->ae.exp_mean, context.hw->numAeCells };
+	hist_ = Histogram(Span<const uint32_t>(params->hist.hist_bins,
+					       context.hw->numHistogramBins));
+}
+
 /**
  * \brief Process RkISP1 statistics, and run AGC operations
  * \param[in] context The shared IPA context
diff --git a/src/ipa/rkisp1/algorithms/agc.h b/src/ipa/rkisp1/algorithms/agc.h
index fb82a33f..b0de4898 100644
--- a/src/ipa/rkisp1/algorithms/agc.h
+++ b/src/ipa/rkisp1/algorithms/agc.h
@@ -14,6 +14,8 @@
 
 #include <libcamera/geometry.h>
 
+#include "libipa/histogram.h"
+
 #include "algorithm.h"
 
 namespace libcamera {
@@ -47,10 +49,15 @@ private:
 	double measureBrightness(Span<const uint32_t> hist) const;
 	void fillMetadata(IPAContext &context, IPAFrameContext &frameContext,
 			  ControlList &metadata);
+	void parseStatistics(const rkisp1_stat_buffer *stats,
+			     IPAContext &context);
 
 	uint64_t frameCount_;
 
 	utils::Duration filteredExposure_;
+
+	Histogram hist_;
+	Span<const uint8_t> expMeans_;
 };
 
 } /* namespace ipa::rkisp1::algorithms */
-- 
2.34.1