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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi (Trading) Limited
 *
 * histogram.cpp - histogram calculations
 */
#include "histogram.h"

#include <cmath>

#include <libcamera/base/log.h>

/**
 * \file histogram.h
 * \brief Class to represent Histograms and manipulate them
 */

namespace libcamera {

namespace ipa {

/**
 * \class Histogram
 * \brief The base class for creating histograms
 *
 * This class stores a cumulative frequency histogram, which is a mapping that
 * counts the cumulative number of observations in all of the bins up to the
 * specified bin. It can be used to find quantiles and averages between quantiles.
 */

/**
 * \brief Create a cumulative histogram
 * \param[in] data A pre-sorted histogram to be passed
 */
Histogram::Histogram(Span<uint32_t> data)
{
	cumulative_.reserve(data.size());
	cumulative_.push_back(0);
	for (const uint32_t &value : data)
		cumulative_.push_back(cumulative_.back() + value);
}

/**
 * \fn Histogram::bins()
 * \brief Retrieve the number of bins currently used by the Histogram
 * \return Number of bins