src/ipa/rkisp1/algorithms/filter.cpp


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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021-2022, Ideas On Board
 *
 * filter.cpp - RkISP1 Filter control
 */

#include "filter.h"

#include <cmath>

#include <libcamera/base/log.h>

#include <libcamera/control_ids.h>

/**
 * \file filter.h
 */

namespace libcamera {

namespace ipa::rkisp1::algorithms {

/**
 * \class Filter
 * \brief RkISP1 Filter control
 *
 * Denoise and Sharpness filters will be applied by RkISP1 during the
 * demosaicing step. The denoise filter is responsible for removing noise from
 * the image, while the sharpness filter will enhance its acutance.
 *
 * \todo In current version the denoise and sharpness control is based on user
 * controls. In a future version it should be controlled automatically by the
 * algorithm.
 */

LOG_DEFINE_CATEGORY(RkISP1Filter)

static constexpr uint32_t kFiltLumWeightDefault = 0x00022040;
static constexpr uint32_t kFiltModeDefault = 0x000004f2;

/**
 * \copydoc libcamera::ipa::Algorithm::queueRequest
 */
void Filter::queueRequest(IPAContext &context,
			  [[maybe_unused]] const uint32_t frame,
			  const ControlList &controls)
{
	auto &filter = context.frameContext.filter;

	const auto &sharpness = controls.get(controls::Sharpness);
	if (sharpness) {
		filter.sharpness = std::round(std::clamp(*sharpness, 0.0f, 10.0f));
		filter.updateParams = true;

		LOG(RkISP1Filter, Debug) << "Set sharpness to " << *sharpness;
	}

	const auto &denoise = controls.get(controls::draft::NoiseReductionMode);
	if (denoise) {
		LOG(RkISP1Filter, Debug) << "Set denoise to " << *denoise;

		switch (*denoise) {
		case controls::draft::NoiseReductionModeOff:
			filter.denoise = 0;
			filter.updateParams = true;
			break;
		case controls::draft::NoiseReductionModeMinimal:
			filter.denoise = 1;
			filter.updateParams = true;
			break;
		case controls::draft::NoiseReductionModeHighQuality:
		case controls::draft::NoiseReductionModeFast:
			filter.denoise = 3;
			filter.updateParams = true;
			break;
		default:
			LOG(RkISP1Filter, Error)
				<< "Unsupported denoise value "
				<< *denoise;
		}
	}
}

/**
 * \copydoc libcamera::ipa::Algorithm::prepare
 */
void Filter::prepare(IPAContext &context, rkisp1_params_cfg *params)
{
	auto &filter = context.frameContext.filter;

	/* Check if the algorithm configuration has been updated. */
	if (!filter.updateParams)
		return;

	filter.updateParams = false;