/*
 *  SPDX-FileCopyrightText: 2002 Patrick Julien <freak@codepimps.org>
 *  SPDX-FileCopyrightText: 2004 Boudewijn Rempt <boud@valdyas.org>
 *
 *  SPDX-License-Identifier: LGPL-2.1-or-later
 */
#include "RgbU8ColorSpace.h"

#include <QColor>
#include <QDomElement>
#include <QImage>

#include <KLocalizedString>

#include "compositeops/KoCompositeOps.h"
#include "compositeops/RgbCompositeOps.h"
#include <KoColorConversions.h>
#include <KoColorSpaceRegistry.h>
#include <KoIntegerMaths.h>
#include <kis_dom_utils.h>

#define downscale(quantum) (quantum) //((unsigned char) ((quantum)/257UL))
#define upscale(value) (value) // ((quint8) (257UL*(value)))

class KoRgbU8InvertColorTransformation : public KoColorTransformation
{
public:
    KoRgbU8InvertColorTransformation(const KoColorSpace *cs)
        : m_psize(cs->pixelSize())
    {
    }

    void transform(const quint8 *src, quint8 *dst, qint32 nPixels) const override
    {
        while (nPixels--) {
            dst[0] = KoColorSpaceMathsTraits<quint8>::max - src[0];
            dst[1] = KoColorSpaceMathsTraits<quint8>::max - src[1];
            dst[2] = KoColorSpaceMathsTraits<quint8>::max - src[2];
            dst[3] = src[3];

            src += m_psize;
            dst += m_psize;
        }
    }

private:
    quint32 m_psize;
};

RgbU8ColorSpace::RgbU8ColorSpace(const QString &name, KoColorProfile *p)
    : LcmsColorSpace<KoBgrU8Traits>(colorSpaceId(), name, TYPE_BGRA_8, cmsSigRgbData, p)
{
    addChannel(new KoChannelInfo(i18n("Blue"), 0, 2, KoChannelInfo::COLOR, KoChannelInfo::UINT8, 1, QColor(0, 0, 255)));
    addChannel(new KoChannelInfo(i18n("Green"), 1, 1, KoChannelInfo::COLOR, KoChannelInfo::UINT8, 1, QColor(0, 255, 0)));
    addChannel(new KoChannelInfo(i18n("Red"), 2, 0, KoChannelInfo::COLOR, KoChannelInfo::UINT8, 1, QColor(255, 0, 0)));
    addChannel(new KoChannelInfo(i18n("Alpha"), 3, 3, KoChannelInfo::ALPHA, KoChannelInfo::UINT8));

    init();

    addStandardCompositeOps<KoBgrU8Traits>(this);

    addCompositeOp(new RgbCompositeOpIn<KoBgrU8Traits>(this));
    addCompositeOp(new RgbCompositeOpOut<KoBgrU8Traits>(this));
    addCompositeOp(new RgbCompositeOpBumpmap<KoBgrU8Traits>(this));
}

KoColorTransformation *RgbU8ColorSpace::createInvertTransformation() const
{
    return new KoRgbU8InvertColorTransformation(this);
}

KoColorSpace *RgbU8ColorSpace::clone() const
{
    return new RgbU8ColorSpace(name(), profile()->clone());
}

void RgbU8ColorSpace::colorToXML(const quint8 *pixel, QDomDocument &doc, QDomElement &colorElt) const
{
    const KoBgrU8Traits::Pixel *p = reinterpret_cast<const KoBgrU8Traits::Pixel *>(pixel);
    QDomElement labElt = doc.createElement("RGB");
    labElt.setAttribute("r", KisDomUtils::toString(KoColorSpaceMaths<KoBgrU8Traits::channels_type, qreal>::scaleToA(p->red)));
    labElt.setAttribute("g", KisDomUtils::toString(KoColorSpaceMaths<KoBgrU8Traits::channels_type, qreal>::scaleToA(p->green)));
    labElt.setAttribute("b", KisDomUtils::toString(KoColorSpaceMaths<KoBgrU8Traits::channels_type, qreal>::scaleToA(p->blue)));
    labElt.setAttribute("space", profile()->name());
    colorElt.appendChild(labElt);
}

void RgbU8ColorSpace::colorFromXML(quint8 *pixel, const QDomElement &elt) const
{
    KoBgrU8Traits::Pixel *p = reinterpret_cast<KoBgrU8Traits::Pixel *>(pixel);
    p->red = KoColorSpaceMaths<qreal, KoBgrU8Traits::channels_type>::scaleToA(KisDomUtils::toDouble(elt.attribute("r")));
    p->green = KoColorSpaceMaths<qreal, KoBgrU8Traits::channels_type>::scaleToA(KisDomUtils::toDouble(elt.attribute("g")));
    p->blue = KoColorSpaceMaths<qreal, KoBgrU8Traits::channels_type>::scaleToA(KisDomUtils::toDouble(elt.attribute("b")));
    p->alpha = KoColorSpaceMathsTraits<quint8>::max;
}

quint8 RgbU8ColorSpace::intensity8(const quint8 *src) const
{
    const KoBgrU8Traits::Pixel *p = reinterpret_cast<const KoBgrU8Traits::Pixel *>(src);
    return (quint8)(p->red * 0.30 + p->green * 0.59 + p->blue * 0.11);
}

void RgbU8ColorSpace::toHSY(const QVector<double> &channelValues, qreal *hue, qreal *sat, qreal *luma) const
{
    RGBToHSY(channelValues[0], channelValues[1], channelValues[2], hue, sat, luma, lumaCoefficients()[0], lumaCoefficients()[1], lumaCoefficients()[2]);
}

QVector<double> RgbU8ColorSpace::fromHSY(qreal *hue, qreal *sat, qreal *luma) const
{
    QVector<double> channelValues(4);
    HSYToRGB(*hue, *sat, *luma, &channelValues[0], &channelValues[1], &channelValues[2], lumaCoefficients()[0], lumaCoefficients()[1], lumaCoefficients()[2]);
    channelValues[3] = 1.0;
    return channelValues;
}

void RgbU8ColorSpace::toYUV(const QVector<double> &channelValues, qreal *y, qreal *u, qreal *v) const
{
    RGBToYUV(channelValues[0], channelValues[1], channelValues[2], y, u, v, lumaCoefficients()[0], lumaCoefficients()[1], lumaCoefficients()[2]);
}

QVector<double> RgbU8ColorSpace::fromYUV(qreal *y, qreal *u, qreal *v) const
{
    QVector<double> channelValues(4);

    YUVToRGB(*y, *u, *v, &channelValues[0], &channelValues[1], &channelValues[2], lumaCoefficients()[0], lumaCoefficients()[1], lumaCoefficients()[2]);
    channelValues[3] = 1.0;
    return channelValues;
}
