From 9d1b2b3ba8fec72374818da107d9f047d2bde02c Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
Date: Thu, 19 Feb 2026 15:05:07 +0000
Subject: [PATCH] ipa: rkisp1: cproc: Convert to use Quantized types

Convert the Brightness, Contrast and Saturation helper functions to a
Quantizer type to support maintaining the data.

While modifying the include blocks of the ipa_context.h, also fix the
include style for libipa components.

Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/ipa/rkisp1/algorithms/cproc.cpp | 28 +++++++++-------------------
 src/ipa/rkisp1/ipa_context.h        | 23 +++++++++++++++--------
 2 files changed, 24 insertions(+), 27 deletions(-)

diff --git a/src/ipa/rkisp1/algorithms/cproc.cpp b/src/ipa/rkisp1/algorithms/cproc.cpp
index d1fff699..4374c08c 100644
--- a/src/ipa/rkisp1/algorithms/cproc.cpp
+++ b/src/ipa/rkisp1/algorithms/cproc.cpp
@@ -39,16 +39,6 @@ constexpr float kDefaultBrightness = 0.0f;
 constexpr float kDefaultContrast = 1.0f;
 constexpr float kDefaultSaturation = 1.0f;
 
-int convertBrightness(const float v)
-{
-	return std::clamp<int>(std::lround(v * 128), -128, 127);
-}
-
-int convertContrastOrSaturation(const float v)
-{
-	return std::clamp<int>(std::lround(v * 128), 0, 255);
-}
-
 } /* namespace */
 
 /**
@@ -74,9 +64,9 @@ int ColorProcessing::configure(IPAContext &context,
 {
 	auto &cproc = context.activeState.cproc;
 
-	cproc.brightness = convertBrightness(kDefaultBrightness);
-	cproc.contrast = convertContrastOrSaturation(kDefaultContrast);
-	cproc.saturation = convertContrastOrSaturation(kDefaultSaturation);
+	cproc.brightness = BrightnessQ(kDefaultBrightness);
+	cproc.contrast = ContrastQ(kDefaultContrast);
+	cproc.saturation = SaturationQ(kDefaultSaturation);
 
 	return 0;
 }
@@ -97,7 +87,7 @@ void ColorProcessing::queueRequest(IPAContext &context,
 
 	const auto &brightness = controls.get(controls::Brightness);
 	if (brightness) {
-		int value = convertBrightness(*brightness);
+		BrightnessQ value = *brightness;
 		if (cproc.brightness != value) {
 			cproc.brightness = value;
 			update = true;
@@ -108,7 +98,7 @@ void ColorProcessing::queueRequest(IPAContext &context,
 
 	const auto &contrast = controls.get(controls::Contrast);
 	if (contrast) {
-		int value = convertContrastOrSaturation(*contrast);
+		ContrastQ value = *contrast;
 		if (cproc.contrast != value) {
 			cproc.contrast = value;
 			update = true;
@@ -119,7 +109,7 @@ void ColorProcessing::queueRequest(IPAContext &context,
 
 	const auto saturation = controls.get(controls::Saturation);
 	if (saturation) {
-		int value = convertContrastOrSaturation(*saturation);
+		SaturationQ value = *saturation;
 		if (cproc.saturation != value) {
 			cproc.saturation = value;
 			update = true;
@@ -148,9 +138,9 @@ void ColorProcessing::prepare([[maybe_unused]] IPAContext &context,
 
 	auto config = params->block<BlockType::Cproc>();
 	config.setEnabled(true);
-	config->brightness = frameContext.cproc.brightness;
-	config->contrast = frameContext.cproc.contrast;
-	config->sat = frameContext.cproc.saturation;
+	config->brightness = frameContext.cproc.brightness.quantized();
+	config->contrast = frameContext.cproc.contrast.quantized();
+	config->sat = frameContext.cproc.saturation.quantized();
 }
 
 REGISTER_IPA_ALGORITHM(ColorProcessing, "ColorProcessing")
diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index fa748811..cca5e281 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -24,14 +24,20 @@
 #include "libcamera/internal/matrix.h"
 #include "libcamera/internal/vector.h"
 
-#include <libipa/camera_sensor_helper.h>
-#include <libipa/fc_queue.h>
 #include "libipa/agc_mean_luminance.h"
+#include "libipa/camera_sensor_helper.h"
+#include "libipa/fc_queue.h"
+#include "libipa/fixedpoint.h"
 
 namespace libcamera {
 
 namespace ipa::rkisp1 {
 
+/* Fixed point types used by CPROC */
+using BrightnessQ = Q<1, 7>;
+using ContrastQ = UQ<1, 7>;
+using SaturationQ = UQ<1, 7>;
+
 struct IPAHwSettings {
 	unsigned int numAeCells;
 	unsigned int numHistogramBins;
@@ -111,9 +117,9 @@ struct IPAActiveState {
 	} ccm;
 
 	struct {
-		int8_t brightness;
-		uint8_t contrast;
-		uint8_t saturation;
+		BrightnessQ brightness;
+		ContrastQ contrast;
+		SaturationQ saturation;
 	} cproc;
 
 	struct {
@@ -173,9 +179,10 @@ struct IPAFrameContext : public FrameContext {
 	} awb;
 
 	struct {
-		int8_t brightness;
-		uint8_t contrast;
-		uint8_t saturation;
+		BrightnessQ brightness;
+		ContrastQ contrast;
+		SaturationQ saturation;
+
 		bool update;
 	} cproc;