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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi Ltd
 *
 * contrast.cpp - contrast (gamma) control algorithm
 */
#include <stdint.h>

#include <libcamera/base/log.h>

#include "../contrast_status.h"
#include "../histogram.h"

#include "contrast.h"

using namespace RPiController;
using namespace libcamera;

LOG_DEFINE_CATEGORY(RPiContrast)

/*
 * This is a very simple control algorithm which simply retrieves the results of
 * AGC and AWB via their "status" metadata, and applies digital gain to the
 * colour channels in accordance with those instructions. We take care never to
 * apply less than unity gains, as that would cause fully saturated pixels to go
 * off-white.
 */

#define NAME "rpi.contrast"

Contrast::Contrast(Controller *controller)
	: ContrastAlgorithm(controller), brightness_(0.0), contrast_(1.0)
{
}

char const *Contrast::name() const
{
	return NAME;
}

int Contrast::read(const libcamera::YamlObject &params)
{
	// enable adaptive enhancement by default
	config_.ceEnable = params["ce_enable"].get<int>(1);
	// the point near the bottom of the histogram to move
	config_.loHistogram = params["lo_histogram"].get<double>(0.01);
	// where in the range to try and move it to
	config_.loLevel = params["lo_level"].get<double>(0.015);
	// but don't move by more than this
	config_.loMax = params["lo_max"].get<double>(500);
	// equivalent values for the top of the histogram...
	config_.hiHistogram = params["hi_histogram"].get<double>(0.95);
	config_.hiLevel = params["hi_level"].get<double>(0.95);
	config_.hiMax = params["hi_max"].get<double>(2000);
	return config_.gammaCurve.read(params["gamma_curve"]);
}

void Contrast::setBrightness(double brightness)
{
	brightness_ = brightness;
}

void Contrast::setContrast(double contrast)
{
	contrast_ = contrast;
}

static void fillInStatus(ContrastStatus &status, double brightness,
			 double contrast, Pwl &gammaCurve)
{
	status.brightness = brightness;
	status.contrast = contrast;
	for (unsigned int i = 0; i < ContrastNumPoints - 1; i++) {
		int x = i < 16 ? i * 1024
			       : (i < 24 ? (i - 16) * 2048 + 16384
					 : (i - 24) * 4096 + 32768);
		status.points[i].x = x;
		status.points[i].y = std::min(65535.0, gammaCurve.eval(x));
	}
	status.points[ContrastNumPoints - 1].x = 65535;
	status.points[ContrastNumPoints - 1].y = 65535;
}