[PATCH 2/9] libcamera: software_isp: Store color temperature to metadata

[Milan Zamazal]

Image color temperature is a piece of information that should be
reported in metadata, let's put it there.

Metadata is currently not reported in simple pipeline but we should make
at least newly added information ready to be reported.

Signed-off-by: Milan Zamazal <mzamazal at redhat.com>
---
 src/ipa/simple/algorithms/awb.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ipa/simple/algorithms/awb.cpp b/src/ipa/simple/algorithms/awb.cpp
index db384c3fa..eef8277fc 100644
--- a/src/ipa/simple/algorithms/awb.cpp
+++ b/src/ipa/simple/algorithms/awb.cpp
@@ -12,6 +12,8 @@
 
 #include <libcamera/base/log.h>
 
+#include <libcamera/control_ids.h>
+
 #include "libipa/colours.h"
 #include "simple/ipa_context.h"
 
@@ -34,7 +36,7 @@ void Awb::process(IPAContext &context,
 		  [[maybe_unused]] const uint32_t frame,
 		  [[maybe_unused]] IPAFrameContext &frameContext,
 		  const SwIspStats *stats,
-		  [[maybe_unused]] ControlList &metadata)
+		  ControlList &metadata)
 {
 	const SwIspStats::Histogram &histogram = stats->yHistogram;
 	const uint8_t blackLevel = context.activeState.blc.level;
@@ -60,8 +62,10 @@ void Awb::process(IPAContext &context,
 	gains.blue = sumB <= sumG / 4 ? 4.0 : static_cast<double>(sumG) / sumB;
 	/* Green gain is fixed to 1.0 */
 
-	context.activeState.awb.temperatureK =
+	uint32_t temperature =
 		estimateCCT(1 / gains.red, 1 / gains.green, 1 / gains.blue);
+	context.activeState.awb.temperatureK = temperature;
+	metadata.set(controls::ColourTemperature, temperature);
 
 	LOG(IPASoftAwb, Debug)
 		<< "gain R/B: " << gains.red << "/" << gains.blue
-- 
2.44.2