ipa: rkisp1: Add support of ColorProcessing control

Add ColorProcessing algorithm that is in charge to manage brightness,
contrast and saturation controls.  These controls are currently based on
user controls.

Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/rkisp1/algorithms/cproc.cpp

@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * cproc.cpp - RkISP1 Color Processing control
+ */
+
+#include "cproc.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include <libcamera/base/log.h>
+
+#include <libcamera/control_ids.h>
+
+/**
+ * \file cproc.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+/**
+ * \class ColorProcessing
+ * \brief RkISP1 Color Processing control
+ *
+ * The ColorProcessing algorithm is responsible for applying brightness,
+ * contrast and saturation corrections. The values are directly provided
+ * through requests by the corresponding controls.
+ */
+
+LOG_DEFINE_CATEGORY(RkISP1CProc)
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::queueRequest
+ */
+void ColorProcessing::queueRequest(IPAContext &context,
+				   [[maybe_unused]] const uint32_t frame,
+				   const ControlList &controls)
+{
+	auto &cproc = context.frameContext.cproc;
+
+	const auto &brightness = controls.get(controls::Brightness);
+	if (brightness) {
+		cproc.brightness = std::clamp<int>(std::lround(*brightness * 128), -128, 127);
+		cproc.updateParams = true;
+
+		LOG(RkISP1CProc, Debug) << "Set brightness to " << *brightness;
+	}
+
+	const auto &contrast = controls.get(controls::Contrast);
+	if (contrast) {
+		cproc.contrast = std::clamp<int>(std::lround(*contrast * 128), 0, 255);
+		cproc.updateParams = true;
+
+		LOG(RkISP1CProc, Debug) << "Set contrast to " << *contrast;
+	}
+
+	const auto saturation = controls.get(controls::Saturation);
+	if (saturation) {
+		cproc.saturation = std::clamp<int>(std::lround(*saturation * 128), 0, 255);
+		cproc.updateParams = true;
+
+		LOG(RkISP1CProc, Debug) << "Set saturation to " << *saturation;
+	}
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void ColorProcessing::prepare(IPAContext &context,
+			      rkisp1_params_cfg *params)
+{
+	auto &cproc = context.frameContext.cproc;
+
+	/* Check if the algorithm configuration has been updated. */
+	if (!cproc.updateParams)
+		return;
+
+	cproc.updateParams = false;
+
+	params->others.cproc_config.brightness = cproc.brightness;
+	params->others.cproc_config.contrast = cproc.contrast;
+	params->others.cproc_config.sat = cproc.saturation;
+
+	params->module_en_update |= RKISP1_CIF_ISP_MODULE_CPROC;
+	params->module_ens |= RKISP1_CIF_ISP_MODULE_CPROC;
+	params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_CPROC;
+}
+
+REGISTER_IPA_ALGORITHM(ColorProcessing, "ColorProcessing")
+
+} /* namespace ipa::rkisp1::algorithms */
+
+} /* namespace libcamera */