From 3d7ef342b76b2aa191f3868d98de59f75aaed06e Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Date: Thu, 11 Dec 2025 23:22:42 +0000
Subject: [PATCH] libcamera: software_isp: lut: Make CCM available in debayer
 params

Provide the CCM calculated in LUT to the debayer params structure for
consumption in the debayer shaders.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 include/libcamera/internal/software_isp/debayer_params.h | 7 +++++++
 src/ipa/simple/algorithms/lut.cpp                        | 1 +
 src/libcamera/software_isp/debayer.cpp                   | 5 +++++
 3 files changed, 13 insertions(+)

diff --git a/include/libcamera/internal/software_isp/debayer_params.h b/include/libcamera/internal/software_isp/debayer_params.h
index 217cd5d9..4b203e21 100644
--- a/include/libcamera/internal/software_isp/debayer_params.h
+++ b/include/libcamera/internal/software_isp/debayer_params.h
@@ -13,6 +13,8 @@
 #include <array>
 #include <stdint.h>
 
+#include "libcamera/internal/matrix.h"
+
 namespace libcamera {
 
 struct DebayerParams {
@@ -49,6 +51,11 @@ struct DebayerParams {
 	CcmLookupTable greenCcm;
 	CcmLookupTable blueCcm;
 	LookupTable gammaLut;
+
+	/*
+	 * Per frame corrections as calculated by the IPA
+	 */
+	Matrix<float, 3, 3> ccm;
 };
 
 } /* namespace libcamera */
diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp
index d4a79e10..49482d71 100644
--- a/src/ipa/simple/algorithms/lut.cpp
+++ b/src/ipa/simple/algorithms/lut.cpp
@@ -133,6 +133,7 @@ void Lut::prepare(IPAContext &context,
 		auto &red = params->redCcm;
 		auto &green = params->greenCcm;
 		auto &blue = params->blueCcm;
+		params->ccm = ccm;
 		for (unsigned int i = 0; i < DebayerParams::kRGBLookupSize; i++) {
 			red[i].r = ccmValue(i, ccm[0][0]);
 			red[i].g = ccmValue(i, ccm[1][0]);
diff --git a/src/libcamera/software_isp/debayer.cpp b/src/libcamera/software_isp/debayer.cpp
index 25d83e88..7c0e438a 100644
--- a/src/libcamera/software_isp/debayer.cpp
+++ b/src/libcamera/software_isp/debayer.cpp
@@ -100,6 +100,11 @@ namespace libcamera {
  * \brief Gamma lookup table used with color correction matrix
  */
 
+/**
+ * \var DebayerParams::ccm
+ * \brief Per frame colour correction matrix for GPUISP
+ */
+
 /**
  * \class Debayer
  * \brief Base debayering class