qcolor.cpp

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#include "qcolor.h"
#include "qcolor_p.h"
#include "qnamespace.h"
#include "qcolormap.h"
#include "qdatastream.h"
#include "qvariant.h"
#include "qdebug.h"

#ifdef Q_WS_X11
#  include "qapplication.h"
#  include "qx11info_x11.h"
#  include "private/qt_x11_p.h"

static bool allowX11ColorNames = false;

#endif

#include <math.h>
#include <stdio.h>
#include <limits.h>

QT_BEGIN_NAMESPACE

#define QCOLOR_INT_RANGE_CHECK(fn, var) \
    do { \
        if (var < 0 || var > 255) { \
            qWarning(#fn": invalid value %d", var); \
            var = qMax(0, qMin(var, 255)); \
        } \
    } while (0)

#define QCOLOR_REAL_RANGE_CHECK(fn, var) \
    do { \
        if (var < qreal(0.0) || var > qreal(1.0)) { \
            qWarning(#fn": invalid value %g", var); \
            var = qMax(qreal(0.0), qMin(var, qreal(1.0)));      \
        } \
    } while (0)

/*****************************************************************************
  QColor member functions
 *****************************************************************************/

QColor::QColor(Qt::GlobalColor color)
{
#define QRGB(r, g, b) \
    QRgb(((0xffu << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff)))
#define QRGBA(r, g, b, a) \
    QRgb(((a & 0xff) << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff))

    static const QRgb global_colors[] = {
        QRGB(255, 255, 255), // Qt::color0
        QRGB(  0,   0,   0), // Qt::color1
        QRGB(  0,   0,   0), // black
        QRGB(255, 255, 255), // white
        /*
         * From the "The Palette Manager: How and Why" by Ron Gery,
         * March 23, 1992, archived on MSDN:
         *
         *     The Windows system palette is broken up into two
         *     sections, one with fixed colors and one with colors
         *     that can be changed by applications. The system palette
         *     predefines 20 entries; these colors are known as the
         *     static or reserved colors and consist of the 16 colors
         *     found in the Windows version 3.0 VGA driver and 4
         *     additional colors chosen for their visual appeal.  The
         *     DEFAULT_PALETTE stock object is, as the name implies,
         *     the default palette selected into a device context (DC)
         *     and consists of these static colors. Applications can
         *     set the remaining 236 colors using the Palette Manager.
         *
         * The 20 reserved entries have indices in [0,9] and
         * [246,255]. We reuse 17 of them.
         */
        QRGB(128, 128, 128), // index 248   medium gray
        QRGB(160, 160, 164), // index 247   light gray
        QRGB(192, 192, 192), // index 7     light gray
        QRGB(255,   0,   0), // index 249   red
        QRGB(  0, 255,   0), // index 250   green
        QRGB(  0,   0, 255), // index 252   blue
        QRGB(  0, 255, 255), // index 254   cyan
        QRGB(255,   0, 255), // index 253   magenta
        QRGB(255, 255,   0), // index 251   yellow
        QRGB(128,   0,   0), // index 1     dark red
        QRGB(  0, 128,   0), // index 2     dark green
        QRGB(  0,   0, 128), // index 4     dark blue
        QRGB(  0, 128, 128), // index 6     dark cyan
        QRGB(128,   0, 128), // index 5     dark magenta
        QRGB(128, 128,   0), // index 3     dark yellow
        QRGBA(0, 0, 0, 0)    //             transparent
    };
#undef QRGB
#undef QRGBA

    setRgb(qRed(global_colors[color]),
           qGreen(global_colors[color]),
           qBlue(global_colors[color]),
           qAlpha(global_colors[color]));
}

QColor::QColor(QRgb color)
{
    cspec = Rgb;
    ct.argb.alpha = 0xffff;
    ct.argb.red   = qRed(color)   * 0x101;
    ct.argb.green = qGreen(color) * 0x101;
    ct.argb.blue  = qBlue(color)  * 0x101;
    ct.argb.pad   = 0;
}


QColor::QColor(Spec spec)
{
    switch (spec) {
    case Invalid:
        invalidate();
        break;
    case Rgb:
        setRgb(0, 0, 0);
        break;
    case Hsv:
        setHsv(0, 0, 0);
        break;
    case Cmyk:
        setCmyk(0, 0, 0, 0);
        break;
    case Hsl:
        setHsl(0, 0, 0, 0);
        break;
    }
}

QString QColor::name() const
{
    QString s;
    s.sprintf("#%02x%02x%02x", red(), green(), blue());
    return s;
}

void QColor::setNamedColor(const QString &name)
{
    setColorFromString(name);
}

bool QColor::isValidColor(const QString &name)
{
    return !name.isEmpty() && QColor().setColorFromString(name);
}

bool QColor::setColorFromString(const QString &name)
{
    if (name.isEmpty()) {
        invalidate();
        return true;
    }

    if (name.startsWith(QLatin1Char('#'))) {
        QRgb rgb;
        if (qt_get_hex_rgb(name.constData(), name.length(), &rgb)) {
            setRgb(rgb);
            return true;
        } else {
            invalidate();
            return false;
        }
    }

#ifndef QT_NO_COLORNAMES
    QRgb rgb;
    if (qt_get_named_rgb(name.constData(), name.length(), &rgb)) {
        setRgba(rgb);
        return true;
    } else
#endif
    {
#ifdef Q_WS_X11
        XColor result;
        if (allowX11ColorNames()
            && QApplication::instance()
            && QX11Info::display()
            && XParseColor(QX11Info::display(), QX11Info::appColormap(), name.toLatin1().constData(), &result)) {
            setRgb(result.red >> 8, result.green >> 8, result.blue >> 8);
            return true;
        } else
#endif
        {
            invalidate();
            return false;
        }
    }
}

QStringList QColor::colorNames()
{
#ifndef QT_NO_COLORNAMES
    return qt_get_colornames();
#else
    return QStringList();
#endif
}

void QColor::getHsvF(qreal *h, qreal *s, qreal *v, qreal *a) const
{
        if (!h || !s || !v)
        return;

    if (cspec != Invalid && cspec != Hsv) {
        toHsv().getHsvF(h, s, v, a);
        return;
    }

    *h = ct.ahsv.hue == USHRT_MAX ? qreal(-1.0) : ct.ahsv.hue / qreal(36000.0);
    *s = ct.ahsv.saturation / qreal(USHRT_MAX);
    *v = ct.ahsv.value / qreal(USHRT_MAX);

    if (a)
        *a = ct.ahsv.alpha / qreal(USHRT_MAX);
}

void QColor::getHsv(int *h, int *s, int *v, int *a) const
{
    if (!h || !s || !v)
        return;

    if (cspec != Invalid && cspec != Hsv) {
        toHsv().getHsv(h, s, v, a);
        return;
    }

    *h = ct.ahsv.hue == USHRT_MAX ? -1 : ct.ahsv.hue / 100;
    *s = ct.ahsv.saturation >> 8;
    *v = ct.ahsv.value      >> 8;

    if (a)
        *a = ct.ahsv.alpha >> 8;
}

void QColor::setHsvF(qreal h, qreal s, qreal v, qreal a)
{
    if (((h < qreal(0.0) || h > qreal(1.0)) && h != qreal(-1.0))
        || (s < qreal(0.0) || s > qreal(1.0))
        || (v < qreal(0.0) || v > qreal(1.0))
        || (a < qreal(0.0) || a > qreal(1.0))) {
        qWarning("QColor::setHsvF: HSV parameters out of range");
        return;
    }

    cspec = Hsv;
    ct.ahsv.alpha      = qRound(a * USHRT_MAX);
    ct.ahsv.hue        = h == qreal(-1.0) ? USHRT_MAX : qRound(h * 36000);
    ct.ahsv.saturation = qRound(s * USHRT_MAX);
    ct.ahsv.value      = qRound(v * USHRT_MAX);
    ct.ahsv.pad        = 0;
}

void QColor::setHsv(int h, int s, int v, int a)
{
    if (h < -1 || (uint)s > 255 || (uint)v > 255 || (uint)a > 255) {
        qWarning("QColor::setHsv: HSV parameters out of range");
        invalidate();
        return;
    }

    cspec = Hsv;
    ct.ahsv.alpha      = a * 0x101;
    ct.ahsv.hue        = h == -1 ? USHRT_MAX : (h % 360) * 100;
    ct.ahsv.saturation = s * 0x101;
    ct.ahsv.value      = v * 0x101;
    ct.ahsv.pad        = 0;
}

void QColor::getHslF(qreal *h, qreal *s, qreal *l, qreal *a) const
{
        if (!h || !s || !l)
        return;

    if (cspec != Invalid && cspec != Hsl) {
        toHsl().getHslF(h, s, l, a);
        return;
    }

    *h = ct.ahsl.hue == USHRT_MAX ? qreal(-1.0) : ct.ahsl.hue / qreal(36000.0);
    *s = ct.ahsl.saturation / qreal(USHRT_MAX);
    *l = ct.ahsl.lightness / qreal(USHRT_MAX);

    if (a)
        *a = ct.ahsl.alpha / qreal(USHRT_MAX);
}

void QColor::getHsl(int *h, int *s, int *l, int *a) const
{
    if (!h || !s || !l)
        return;

    if (cspec != Invalid && cspec != Hsl) {
        toHsl().getHsl(h, s, l, a);
        return;
    }

    *h = ct.ahsl.hue == USHRT_MAX ? -1 : ct.ahsl.hue / 100;
    *s = ct.ahsl.saturation >> 8;
    *l = ct.ahsl.lightness  >> 8;

    if (a)
        *a = ct.ahsl.alpha >> 8;
}

void QColor::setHslF(qreal h, qreal s, qreal l, qreal a)
{
    if (((h < qreal(0.0) || h > qreal(1.0)) && h != qreal(-1.0))
        || (s < qreal(0.0) || s > qreal(1.0))
        || (l < qreal(0.0) || l > qreal(1.0))
        || (a < qreal(0.0) || a > qreal(1.0))) {
        qWarning("QColor::setHsvF: HSV parameters out of range");
        return;
    }

    cspec = Hsl;
    ct.ahsl.alpha      = qRound(a * USHRT_MAX);
    ct.ahsl.hue        = h == qreal(-1.0) ? USHRT_MAX : qRound(h * 36000);
    ct.ahsl.saturation = qRound(s * USHRT_MAX);
    ct.ahsl.lightness  = qRound(l * USHRT_MAX);
    ct.ahsl.pad        = 0;
}

void QColor::setHsl(int h, int s, int l, int a)
{
    if (h < -1 || (uint)s > 255 || (uint)l > 255 || (uint)a > 255) {
        qWarning("QColor::setHsv: HSV parameters out of range");
        invalidate();
        return;
    }

    cspec = Hsl;
    ct.ahsl.alpha      = a * 0x101;
    ct.ahsl.hue        = h == -1 ? USHRT_MAX : (h % 360) * 100;
    ct.ahsl.saturation = s * 0x101;
    ct.ahsl.lightness  = l * 0x101;
    ct.ahsl.pad        = 0;
}

void QColor::getRgbF(qreal *r, qreal *g, qreal *b, qreal *a) const
{
    if (!r || !g || !b)
        return;

    if (cspec != Invalid && cspec != Rgb) {
        toRgb().getRgbF(r, g, b, a);
        return;
    }

    *r = ct.argb.red   / qreal(USHRT_MAX);
    *g = ct.argb.green / qreal(USHRT_MAX);
    *b = ct.argb.blue  / qreal(USHRT_MAX);

    if (a)
        *a = ct.argb.alpha / qreal(USHRT_MAX);

}

void QColor::getRgb(int *r, int *g, int *b, int *a) const
{
    if (!r || !g || !b)
        return;

    if (cspec != Invalid && cspec != Rgb) {
        toRgb().getRgb(r, g, b, a);
        return;
    }

    *r = ct.argb.red   >> 8;
    *g = ct.argb.green >> 8;
    *b = ct.argb.blue  >> 8;

    if (a)
        *a = ct.argb.alpha >> 8;
}

void QColor::setRgbF(qreal r, qreal g, qreal b, qreal a)
{
    if (r < qreal(0.0) || r > qreal(1.0)
        || g < qreal(0.0) || g > qreal(1.0)
        || b < qreal(0.0) || b > qreal(1.0)
        || a < qreal(0.0) || a > qreal(1.0)) {
        qWarning("QColor::setRgbF: RGB parameters out of range");
        invalidate();
        return;
    }

    cspec = Rgb;
    ct.argb.alpha = qRound(a * USHRT_MAX);
    ct.argb.red   = qRound(r * USHRT_MAX);
    ct.argb.green = qRound(g * USHRT_MAX);
    ct.argb.blue  = qRound(b * USHRT_MAX);
    ct.argb.pad   = 0;
}

void QColor::setRgb(int r, int g, int b, int a)
{
    if ((uint)r > 255 || (uint)g > 255 || (uint)b > 255 || (uint)a > 255) {
        qWarning("QColor::setRgb: RGB parameters out of range");
        invalidate();
        return;
    }

    cspec = Rgb;
    ct.argb.alpha = a * 0x101;
    ct.argb.red   = r * 0x101;
    ct.argb.green = g * 0x101;
    ct.argb.blue  = b * 0x101;
    ct.argb.pad   = 0;
}

QRgb QColor::rgba() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().rgba();
    return qRgba(ct.argb.red >> 8, ct.argb.green >> 8, ct.argb.blue >> 8, ct.argb.alpha >> 8);
}

void QColor::setRgba(QRgb rgba)
{
    cspec = Rgb;
    ct.argb.alpha = qAlpha(rgba) * 0x101;
    ct.argb.red   = qRed(rgba)   * 0x101;
    ct.argb.green = qGreen(rgba) * 0x101;
    ct.argb.blue  = qBlue(rgba)  * 0x101;
    ct.argb.pad   = 0;
}

QRgb QColor::rgb() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().rgb();
    return qRgb(ct.argb.red >> 8, ct.argb.green >> 8, ct.argb.blue >> 8);
}

void QColor::setRgb(QRgb rgb)
{
    cspec = Rgb;
    ct.argb.alpha = 0xffff;
    ct.argb.red   = qRed(rgb)   * 0x101;
    ct.argb.green = qGreen(rgb) * 0x101;
    ct.argb.blue  = qBlue(rgb)  * 0x101;
    ct.argb.pad   = 0;
}

int QColor::alpha() const
{ return ct.argb.alpha >> 8; }


void QColor::setAlpha(int alpha)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setAlpha", alpha);
    ct.argb.alpha = alpha * 0x101;
}

qreal QColor::alphaF() const
{ return ct.argb.alpha / qreal(USHRT_MAX); }

void QColor::setAlphaF(qreal alpha)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setAlphaF", alpha);
    qreal tmp = alpha * USHRT_MAX;
    ct.argb.alpha = qRound(tmp);
}


int QColor::red() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().red();
    return ct.argb.red >> 8;
}

void QColor::setRed(int red)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setRed", red);
    if (cspec != Rgb)
        setRgb(red, green(), blue(), alpha());
    else
        ct.argb.red = red * 0x101;
}

int QColor::green() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().green();
    return ct.argb.green >> 8;
}

void QColor::setGreen(int green)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setGreen", green);
    if (cspec != Rgb)
        setRgb(red(), green, blue(), alpha());
    else
        ct.argb.green = green * 0x101;
}


int QColor::blue() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().blue();
    return ct.argb.blue >> 8;
}


void QColor::setBlue(int blue)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setBlue", blue);
    if (cspec != Rgb)
        setRgb(red(), green(), blue, alpha());
    else
        ct.argb.blue = blue * 0x101;
}

qreal QColor::redF() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().redF();
    return ct.argb.red / qreal(USHRT_MAX);
}


void QColor::setRedF(qreal red)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setRedF", red);
    if (cspec != Rgb)
        setRgbF(red, greenF(), blueF(), alphaF());
    else
        ct.argb.red = qRound(red * USHRT_MAX);
}

qreal QColor::greenF() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().greenF();
    return ct.argb.green / qreal(USHRT_MAX);
}


void QColor::setGreenF(qreal green)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setGreenF", green);
    if (cspec != Rgb)
        setRgbF(redF(), green, blueF(), alphaF());
    else
        ct.argb.green = qRound(green * USHRT_MAX);
}

qreal QColor::blueF() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().blueF();
    return ct.argb.blue / qreal(USHRT_MAX);
}

void QColor::setBlueF(qreal blue)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setBlueF", blue);
    if (cspec != Rgb)
        setRgbF(redF(), greenF(), blue, alphaF());
    else
        ct.argb.blue = qRound(blue * USHRT_MAX);
}

int QColor::hue() const
{
    return hsvHue();
}

int QColor::hsvHue() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().hue();
    return ct.ahsv.hue == USHRT_MAX ? -1 : ct.ahsv.hue / 100;
}

int QColor::saturation() const
{
    return hsvSaturation();
}

int QColor::hsvSaturation() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().saturation();
    return ct.ahsv.saturation >> 8;
}

int QColor::value() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().value();
    return ct.ahsv.value >> 8;
}

qreal QColor::hueF() const
{
    return hsvHueF();
}

qreal QColor::hsvHueF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().hueF();
    return ct.ahsv.hue == USHRT_MAX ? qreal(-1.0) : ct.ahsv.hue / qreal(36000.0);
}

qreal QColor::saturationF() const
{
    return hsvSaturationF();
}

qreal QColor::hsvSaturationF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().saturationF();
    return ct.ahsv.saturation / qreal(USHRT_MAX);
}

qreal QColor::valueF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().valueF();
    return ct.ahsv.value / qreal(USHRT_MAX);
}

int QColor::hslHue() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().hslHue();
    return ct.ahsl.hue == USHRT_MAX ? -1 : ct.ahsl.hue / 100;
}

int QColor::hslSaturation() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().hslSaturation();
    return ct.ahsl.saturation >> 8;
}

int QColor::lightness() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().lightness();
    return ct.ahsl.lightness >> 8;
}

qreal QColor::hslHueF() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().hslHueF();
    return ct.ahsl.hue == USHRT_MAX ? qreal(-1.0) : ct.ahsl.hue / qreal(36000.0);
}

qreal QColor::hslSaturationF() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().hslSaturationF();
    return ct.ahsl.saturation / qreal(USHRT_MAX);
}

qreal QColor::lightnessF() const
{
    if (cspec != Invalid && cspec != Hsl)
        return toHsl().lightnessF();
    return ct.ahsl.lightness / qreal(USHRT_MAX);
}

int QColor::cyan() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().cyan();
    return ct.acmyk.cyan >> 8;
}

int QColor::magenta() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().magenta();
    return ct.acmyk.magenta >> 8;
}

int QColor::yellow() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().yellow();
    return ct.acmyk.yellow >> 8;
}

int QColor::black() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().black();
    return ct.acmyk.black >> 8;
}

qreal QColor::cyanF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().cyanF();
    return ct.acmyk.cyan / qreal(USHRT_MAX);
}

qreal QColor::magentaF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().magentaF();
    return ct.acmyk.magenta / qreal(USHRT_MAX);
}

qreal QColor::yellowF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().yellowF();
    return ct.acmyk.yellow / qreal(USHRT_MAX);
}

qreal QColor::blackF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().blackF();
    return ct.acmyk.black / qreal(USHRT_MAX);
}

QColor QColor::toRgb() const
{
    if (!isValid() || cspec == Rgb)
        return *this;

    QColor color;
    color.cspec = Rgb;
    color.ct.argb.alpha = ct.argb.alpha;
    color.ct.argb.pad = 0;

    switch (cspec) {
    case Hsv:
        {
            if (ct.ahsv.saturation == 0 || ct.ahsv.hue == USHRT_MAX) {
                // achromatic case
                color.ct.argb.red = color.ct.argb.green = color.ct.argb.blue = ct.ahsv.value;
                break;
            }

            // chromatic case
            const qreal h = ct.ahsv.hue == 36000 ? 0 : ct.ahsv.hue / qreal(6000.);
            const qreal s = ct.ahsv.saturation / qreal(USHRT_MAX);
            const qreal v = ct.ahsv.value / qreal(USHRT_MAX);
            const int i = int(h);
            const qreal f = h - i;
            const qreal p = v * (qreal(1.0) - s);

            if (i & 1) {
                const qreal q = v * (qreal(1.0) - (s * f));

                switch (i) {
                case 1:
                    color.ct.argb.red   = qRound(q * USHRT_MAX);
                    color.ct.argb.green = qRound(v * USHRT_MAX);
                    color.ct.argb.blue  = qRound(p * USHRT_MAX);
                    break;
                case 3:
                    color.ct.argb.red   = qRound(p * USHRT_MAX);
                    color.ct.argb.green = qRound(q * USHRT_MAX);
                    color.ct.argb.blue  = qRound(v * USHRT_MAX);
                    break;
                case 5:
                    color.ct.argb.red   = qRound(v * USHRT_MAX);
                    color.ct.argb.green = qRound(p * USHRT_MAX);
                    color.ct.argb.blue  = qRound(q * USHRT_MAX);
                    break;
                }
            } else {
                const qreal t = v * (qreal(1.0) - (s * (qreal(1.0) - f)));

                switch (i) {
                case 0:
                    color.ct.argb.red   = qRound(v * USHRT_MAX);
                    color.ct.argb.green = qRound(t * USHRT_MAX);
                    color.ct.argb.blue  = qRound(p * USHRT_MAX);
                    break;
                case 2:
                    color.ct.argb.red   = qRound(p * USHRT_MAX);
                    color.ct.argb.green = qRound(v * USHRT_MAX);
                    color.ct.argb.blue  = qRound(t * USHRT_MAX);
                    break;
                case 4:
                    color.ct.argb.red   = qRound(t * USHRT_MAX);
                    color.ct.argb.green = qRound(p * USHRT_MAX);
                    color.ct.argb.blue  = qRound(v * USHRT_MAX);
                    break;
                }
            }
            break;
        }
    case Hsl:
        {
            if (ct.ahsl.saturation == 0 || ct.ahsl.hue == USHRT_MAX) {
                // achromatic case
                color.ct.argb.red = color.ct.argb.green = color.ct.argb.blue = ct.ahsl.lightness;
            } else if (ct.ahsl.lightness == 0) {
                // lightness 0
                color.ct.argb.red = color.ct.argb.green = color.ct.argb.blue = 0;
            } else {
                // chromatic case
                const qreal h = ct.ahsl.hue == 36000 ? 0 : ct.ahsl.hue / qreal(36000.);
                const qreal s = ct.ahsl.saturation / qreal(USHRT_MAX);
                const qreal l = ct.ahsl.lightness / qreal(USHRT_MAX);

                qreal temp2;
                if (l < qreal(0.5))
                    temp2 = l * (qreal(1.0) + s);
                else
                    temp2 = l + s - (l * s);

                const qreal temp1 = (qreal(2.0) * l) - temp2;
                qreal temp3[3] = { h + (qreal(1.0) / qreal(3.0)),
                                   h,
                                   h - (qreal(1.0) / qreal(3.0)) };

                for (int i = 0; i != 3; ++i) {
                    if (temp3[i] < qreal(0.0))
                        temp3[i] += qreal(1.0);
                    else if (temp3[i] > qreal(1.0))
                        temp3[i] -= qreal(1.0);

                    const qreal sixtemp3 = temp3[i] * qreal(6.0);
                    if (sixtemp3 < qreal(1.0))
                        color.ct.array[i+1] = qRound((temp1 + (temp2 - temp1) * sixtemp3) * USHRT_MAX);
                    else if ((temp3[i] * qreal(2.0)) < qreal(1.0))
                        color.ct.array[i+1] = qRound(temp2 * USHRT_MAX);
                    else if ((temp3[i] * qreal(3.0)) < qreal(2.0))
                        color.ct.array[i+1] = qRound((temp1 + (temp2 -temp1) * (qreal(2.0) /qreal(3.0) - temp3[i]) * qreal(6.0)) * USHRT_MAX);
                    else
                        color.ct.array[i+1] = qRound(temp1 * USHRT_MAX);
                }
                color.ct.argb.red = color.ct.argb.red == 1 ? 0 : color.ct.argb.red;
                color.ct.argb.green = color.ct.argb.green == 1 ? 0 : color.ct.argb.green;
                color.ct.argb.blue = color.ct.argb.blue == 1 ? 0 : color.ct.argb.blue;
            }
            break;
        }
    case Cmyk:
        {
            const qreal c = ct.acmyk.cyan / qreal(USHRT_MAX);
            const qreal m = ct.acmyk.magenta / qreal(USHRT_MAX);
            const qreal y = ct.acmyk.yellow / qreal(USHRT_MAX);
            const qreal k = ct.acmyk.black / qreal(USHRT_MAX);

            color.ct.argb.red   = qRound((qreal(1.0) - (c * (qreal(1.0) - k) + k)) * USHRT_MAX);
            color.ct.argb.green = qRound((qreal(1.0) - (m * (qreal(1.0) - k) + k)) * USHRT_MAX);
            color.ct.argb.blue  = qRound((qreal(1.0) - (y * (qreal(1.0) - k) + k)) * USHRT_MAX);
            break;
        }
    default:
        break;
    }

    return color;
}


#define Q_MAX_3(a, b, c) ( ( a > b && a > c) ? a : (b > c ? b : c) )
#define Q_MIN_3(a, b, c) ( ( a < b && a < c) ? a : (b < c ? b : c) )


QColor QColor::toHsv() const
{
    if (!isValid() || cspec == Hsv)
        return *this;

    if (cspec != Rgb)
        return toRgb().toHsv();

    QColor color;
    color.cspec = Hsv;
    color.ct.ahsv.alpha = ct.argb.alpha;
    color.ct.ahsv.pad = 0;

    const qreal r = ct.argb.red   / qreal(USHRT_MAX);
    const qreal g = ct.argb.green / qreal(USHRT_MAX);
    const qreal b = ct.argb.blue  / qreal(USHRT_MAX);
    const qreal max = Q_MAX_3(r, g, b);
    const qreal min = Q_MIN_3(r, g, b);
    const qreal delta = max - min;
    color.ct.ahsv.value = qRound(max * USHRT_MAX);
    if (qFuzzyIsNull(delta)) {
        // achromatic case, hue is undefined
        color.ct.ahsv.hue = USHRT_MAX;
        color.ct.ahsv.saturation = 0;
    } else {
        // chromatic case
        qreal hue = 0;
        color.ct.ahsv.saturation = qRound((delta / max) * USHRT_MAX);
        if (qFuzzyCompare(r, max)) {
            hue = ((g - b) /delta);
        } else if (qFuzzyCompare(g, max)) {
            hue = (qreal(2.0) + (b - r) / delta);
        } else if (qFuzzyCompare(b, max)) {
            hue = (qreal(4.0) + (r - g) / delta);
        } else {
            Q_ASSERT_X(false, "QColor::toHsv", "internal error");
        }
        hue *= qreal(60.0);
        if (hue < qreal(0.0))
            hue += qreal(360.0);
        color.ct.ahsv.hue = qRound(hue * 100);
    }

    return color;
}

QColor QColor::toHsl() const
{
    if (!isValid() || cspec == Hsl)
        return *this;

    if (cspec != Rgb)
        return toRgb().toHsl();

    QColor color;
    color.cspec = Hsl;
    color.ct.ahsl.alpha = ct.argb.alpha;
    color.ct.ahsl.pad = 0;

    const qreal r = ct.argb.red   / qreal(USHRT_MAX);
    const qreal g = ct.argb.green / qreal(USHRT_MAX);
    const qreal b = ct.argb.blue  / qreal(USHRT_MAX);
    const qreal max = Q_MAX_3(r, g, b);
    const qreal min = Q_MIN_3(r, g, b);
    const qreal delta = max - min;
    const qreal delta2 = max + min;
    const qreal lightness = qreal(0.5) * delta2;
    color.ct.ahsl.lightness = qRound(lightness * USHRT_MAX);
    if (qFuzzyIsNull(delta)) {
        // achromatic case, hue is undefined
        color.ct.ahsl.hue = USHRT_MAX;
        color.ct.ahsl.saturation = 0;
    } else {
        // chromatic case
        qreal hue = 0;
        if (lightness < qreal(0.5))
            color.ct.ahsl.saturation = qRound((delta / delta2) * USHRT_MAX);
        else
            color.ct.ahsl.saturation = qRound((delta / (qreal(2.0) - delta2)) * USHRT_MAX);
        if (qFuzzyCompare(r, max)) {
            hue = ((g - b) /delta);
        } else if (qFuzzyCompare(g, max)) {
            hue = (qreal(2.0) + (b - r) / delta);
        } else if (qFuzzyCompare(b, max)) {
            hue = (qreal(4.0) + (r - g) / delta);
        } else {
            Q_ASSERT_X(false, "QColor::toHsv", "internal error");
        }
        hue *= qreal(60.0);
        if (hue < qreal(0.0))
            hue += qreal(360.0);
        color.ct.ahsl.hue = qRound(hue * 100);
    }

    return color;
}

QColor QColor::toCmyk() const
{
    if (!isValid() || cspec == Cmyk)
        return *this;
    if (cspec != Rgb)
        return toRgb().toCmyk();

    QColor color;
    color.cspec = Cmyk;
    color.ct.acmyk.alpha = ct.argb.alpha;

    // rgb -> cmy
    const qreal r = ct.argb.red   / qreal(USHRT_MAX);
    const qreal g = ct.argb.green / qreal(USHRT_MAX);
    const qreal b = ct.argb.blue  / qreal(USHRT_MAX);
    qreal c = qreal(1.0) - r;
    qreal m = qreal(1.0) - g;
    qreal y = qreal(1.0) - b;

    // cmy -> cmyk
    const qreal k = qMin(c, qMin(m, y));

    if (!qFuzzyIsNull(k - 1)) {
        c = (c - k) / (qreal(1.0) - k);
        m = (m - k) / (qreal(1.0) - k);
        y = (y - k) / (qreal(1.0) - k);
    }

    color.ct.acmyk.cyan    = qRound(c * USHRT_MAX);
    color.ct.acmyk.magenta = qRound(m * USHRT_MAX);
    color.ct.acmyk.yellow  = qRound(y * USHRT_MAX);
    color.ct.acmyk.black   = qRound(k * USHRT_MAX);

    return color;
}

QColor QColor::convertTo(QColor::Spec colorSpec) const
{
    if (colorSpec == cspec)
        return *this;
    switch (colorSpec) {
    case Rgb:
        return toRgb();
    case Hsv:
        return toHsv();
    case Cmyk:
        return toCmyk();
    case Hsl:
        return toHsl();
    case Invalid:
        break;
    }
    return QColor(); // must be invalid
}


QColor QColor::fromRgb(QRgb rgb)
{
    return fromRgb(qRed(rgb), qGreen(rgb), qBlue(rgb));
}


QColor QColor::fromRgba(QRgb rgba)
{
    return fromRgb(qRed(rgba), qGreen(rgba), qBlue(rgba), qAlpha(rgba));
}

QColor QColor::fromRgb(int r, int g, int b, int a)
{
    if (r < 0 || r > 255
        || g < 0 || g > 255
        || b < 0 || b > 255
        || a < 0 || a > 255) {
        qWarning("QColor::fromRgb: RGB parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Rgb;
    color.ct.argb.alpha = a * 0x101;
    color.ct.argb.red   = r * 0x101;
    color.ct.argb.green = g * 0x101;
    color.ct.argb.blue  = b * 0x101;
    color.ct.argb.pad   = 0;
    return color;
}

QColor QColor::fromRgbF(qreal r, qreal g, qreal b, qreal a)
{
    if (r < qreal(0.0) || r > qreal(1.0)
        || g < qreal(0.0) || g > qreal(1.0)
        || b < qreal(0.0) || b > qreal(1.0)
        || a < qreal(0.0) || a > qreal(1.0)) {
        qWarning("QColor::fromRgbF: RGB parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Rgb;
    color.ct.argb.alpha = qRound(a * USHRT_MAX);
    color.ct.argb.red   = qRound(r * USHRT_MAX);
    color.ct.argb.green = qRound(g * USHRT_MAX);
    color.ct.argb.blue  = qRound(b * USHRT_MAX);
    color.ct.argb.pad   = 0;
    return color;
}

QColor QColor::fromHsv(int h, int s, int v, int a)
{
    if (((h < 0 || h >= 360) && h != -1)
        || s < 0 || s > 255
        || v < 0 || v > 255
        || a < 0 || a > 255) {
        qWarning("QColor::fromHsv: HSV parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Hsv;
    color.ct.ahsv.alpha      = a * 0x101;
    color.ct.ahsv.hue        = h == -1 ? USHRT_MAX : (h % 360) * 100;
    color.ct.ahsv.saturation = s * 0x101;
    color.ct.ahsv.value      = v * 0x101;
    color.ct.ahsv.pad        = 0;
    return color;
}

QColor QColor::fromHsvF(qreal h, qreal s, qreal v, qreal a)
{
    if (((h < qreal(0.0) || h > qreal(1.0)) && h != qreal(-1.0))
        || (s < qreal(0.0) || s > qreal(1.0))
        || (v < qreal(0.0) || v > qreal(1.0))
        || (a < qreal(0.0) || a > qreal(1.0))) {
        qWarning("QColor::fromHsvF: HSV parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Hsv;
    color.ct.ahsv.alpha      = qRound(a * USHRT_MAX);
    color.ct.ahsv.hue        = h == qreal(-1.0) ? USHRT_MAX : qRound(h * 36000);
    color.ct.ahsv.saturation = qRound(s * USHRT_MAX);
    color.ct.ahsv.value      = qRound(v * USHRT_MAX);
    color.ct.ahsv.pad        = 0;
    return color;
}

QColor QColor::fromHsl(int h, int s, int l, int a)
{
    if (((h < 0 || h >= 360) && h != -1)
        || s < 0 || s > 255
        || l < 0 || l > 255
        || a < 0 || a > 255) {
        qWarning("QColor::fromHsv: HSV parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Hsl;
    color.ct.ahsl.alpha      = a * 0x101;
    color.ct.ahsl.hue        = h == -1 ? USHRT_MAX : (h % 360) * 100;
    color.ct.ahsl.saturation = s * 0x101;
    color.ct.ahsl.lightness  = l * 0x101;
    color.ct.ahsl.pad        = 0;
    return color;
}

QColor QColor::fromHslF(qreal h, qreal s, qreal l, qreal a)
{
    if (((h < qreal(0.0) || h > qreal(1.0)) && h != qreal(-1.0))
        || (s < qreal(0.0) || s > qreal(1.0))
        || (l < qreal(0.0) || l > qreal(1.0))
        || (a < qreal(0.0) || a > qreal(1.0))) {
        qWarning("QColor::fromHsvF: HSV parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Hsl;
    color.ct.ahsl.alpha      = qRound(a * USHRT_MAX);
    color.ct.ahsl.hue        = (h == qreal(-1.0)) ? USHRT_MAX : qRound(h * 36000);
    if (color.ct.ahsl.hue == 36000)
        color.ct.ahsl.hue = 0;
    color.ct.ahsl.saturation = qRound(s * USHRT_MAX);
    color.ct.ahsl.lightness  = qRound(l * USHRT_MAX);
    color.ct.ahsl.pad        = 0;
    return color;
}


void QColor::getCmyk(int *c, int *m, int *y, int *k, int *a)
{
    if (!c || !m || !y || !k)
        return;

    if (cspec != Invalid && cspec != Cmyk) {
        toCmyk().getCmyk(c, m, y, k, a);
        return;
    }

    *c = ct.acmyk.cyan >> 8;
    *m = ct.acmyk.magenta >> 8;
    *y = ct.acmyk.yellow >> 8;
    *k = ct.acmyk.black >> 8;

    if (a)
        *a = ct.acmyk.alpha >> 8;
}

void QColor::getCmykF(qreal *c, qreal *m, qreal *y, qreal *k, qreal *a)
{
    if (!c || !m || !y || !k)
        return;

    if (cspec != Invalid && cspec != Cmyk) {
        toCmyk().getCmykF(c, m, y, k, a);
        return;
    }

    *c = ct.acmyk.cyan    / qreal(USHRT_MAX);
    *m = ct.acmyk.magenta / qreal(USHRT_MAX);
    *y = ct.acmyk.yellow  / qreal(USHRT_MAX);
    *k = ct.acmyk.black   / qreal(USHRT_MAX);

    if (a)
        *a = ct.acmyk.alpha / qreal(USHRT_MAX);
}

void QColor::setCmyk(int c, int m, int y, int k, int a)
{
    if (c < 0 || c > 255
        || m < 0 || m > 255
        || y < 0 || y > 255
        || k < 0 || k > 255
        || a < 0 || a > 255) {
        qWarning("QColor::setCmyk: CMYK parameters out of range");
        return;
    }

    cspec = Cmyk;
    ct.acmyk.alpha   = a * 0x101;
    ct.acmyk.cyan    = c * 0x101;
    ct.acmyk.magenta = m * 0x101;
    ct.acmyk.yellow  = y * 0x101;
    ct.acmyk.black   = k * 0x101;
}

void QColor::setCmykF(qreal c, qreal m, qreal y, qreal k, qreal a)
{
    if (c < qreal(0.0) || c > qreal(1.0)
        || m < qreal(0.0) || m > qreal(1.0)
        || y < qreal(0.0) || y > qreal(1.0)
        || k < qreal(0.0) || k > qreal(1.0)
        || a < qreal(0.0) || a > qreal(1.0)) {
        qWarning("QColor::setCmykF: CMYK parameters out of range");
        return;
    }

    cspec = Cmyk;
    ct.acmyk.alpha   = qRound(a * USHRT_MAX);
    ct.acmyk.cyan    = qRound(c * USHRT_MAX);
    ct.acmyk.magenta = qRound(m * USHRT_MAX);
    ct.acmyk.yellow  = qRound(y * USHRT_MAX);
    ct.acmyk.black   = qRound(k * USHRT_MAX);
}

QColor QColor::fromCmyk(int c, int m, int y, int k, int a)
{
    if (c < 0 || c > 255
        || m < 0 || m > 255
        || y < 0 || y > 255
        || k < 0 || k > 255
        || a < 0 || a > 255) {
        qWarning("QColor::fromCmyk: CMYK parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Cmyk;
    color.ct.acmyk.alpha   = a * 0x101;
    color.ct.acmyk.cyan    = c * 0x101;
    color.ct.acmyk.magenta = m * 0x101;
    color.ct.acmyk.yellow  = y * 0x101;
    color.ct.acmyk.black   = k * 0x101;
    return color;
}

QColor QColor::fromCmykF(qreal c, qreal m, qreal y, qreal k, qreal a)
{
    if (c < qreal(0.0) || c > qreal(1.0)
        || m < qreal(0.0) || m > qreal(1.0)
        || y < qreal(0.0) || y > qreal(1.0)
        || k < qreal(0.0) || k > qreal(1.0)
        || a < qreal(0.0) || a > qreal(1.0)) {
        qWarning("QColor::fromCmykF: CMYK parameters out of range");
        return QColor();
    }

    QColor color;
    color.cspec = Cmyk;
    color.ct.acmyk.alpha   = qRound(a * USHRT_MAX);
    color.ct.acmyk.cyan    = qRound(c * USHRT_MAX);
    color.ct.acmyk.magenta = qRound(m * USHRT_MAX);
    color.ct.acmyk.yellow  = qRound(y * USHRT_MAX);
    color.ct.acmyk.black   = qRound(k * USHRT_MAX);
    return color;
}

QColor QColor::light(int factor) const
{
    if (factor <= 0)                                // invalid lightness factor
        return *this;
    else if (factor < 100)                        // makes color darker
        return darker(10000 / factor);

    QColor hsv = toHsv();
    int s = hsv.ct.ahsv.saturation;
    int v = hsv.ct.ahsv.value;

    v = (factor*v)/100;
    if (v > USHRT_MAX) {
        // overflow... adjust saturation
        s -= v - USHRT_MAX;
        if (s < 0)
            s = 0;
        v = USHRT_MAX;
    }

    hsv.ct.ahsv.saturation = s;
    hsv.ct.ahsv.value = v;

    // convert back to same color spec as original color
    return hsv.convertTo(cspec);
}

QColor QColor::dark(int factor) const
{
    if (factor <= 0)                                // invalid darkness factor
        return *this;
    else if (factor < 100)                        // makes color lighter
        return lighter(10000 / factor);

    QColor hsv = toHsv();
    hsv.ct.ahsv.value = (hsv.ct.ahsv.value * 100) / factor;

    // convert back to same color spec as original color
    return hsv.convertTo(cspec);
}

QColor &QColor::operator=(const QColor &color)
{
    cspec = color.cspec;
    ct.argb = color.ct.argb;
    return *this;
}

QColor &QColor::operator=(Qt::GlobalColor color)
{
    return operator=(QColor(color));
}

bool QColor::operator==(const QColor &color) const
{
    if (cspec == Hsl && cspec == color.cspec) {
        return (ct.argb.alpha == color.ct.argb.alpha
                && ((((ct.ahsl.hue % 36000) == (color.ct.ahsl.hue % 36000)))
                    || (ct.ahsl.hue == color.ct.ahsl.hue))
                && (qAbs(ct.ahsl.saturation - color.ct.ahsl.saturation) < 50
                    || ct.ahsl.lightness == 0
                    || color.ct.ahsl.lightness == 0
                    || ct.ahsl.lightness == USHRT_MAX
                    || color.ct.ahsl.lightness == USHRT_MAX)
                && (qAbs(ct.ahsl.lightness - color.ct.ahsl.lightness)) < 50);
    } else {
        return (cspec == color.cspec
                && ct.argb.alpha == color.ct.argb.alpha
                && (((cspec == QColor::Hsv)
                     && ((ct.ahsv.hue % 36000) == (color.ct.ahsv.hue % 36000)))
                    || (ct.ahsv.hue == color.ct.ahsv.hue))
                && ct.argb.green == color.ct.argb.green
                && ct.argb.blue  == color.ct.argb.blue
                && ct.argb.pad   == color.ct.argb.pad);
    }
}

bool QColor::operator!=(const QColor &color) const
{ return !operator==(color); }


QColor::operator QVariant() const
{
    return QVariant(QVariant::Color, this);
}

#ifdef Q_WS_X11

bool QColor::allowX11ColorNames()
{
    return ::allowX11ColorNames;
}

void QColor::setAllowX11ColorNames(bool enabled)
{
    ::allowX11ColorNames = enabled;
}
#endif

void QColor::invalidate()
{
    cspec = Invalid;
    ct.argb.alpha = USHRT_MAX;
    ct.argb.red = 0;
    ct.argb.green = 0;
    ct.argb.blue = 0;
    ct.argb.pad = 0;
}

#ifdef QT3_SUPPORT

uint QColor::pixel(int screen) const
{
    QColormap cmap = QColormap::instance(screen);
    return cmap.pixel(*this);
}

#endif // QT3_SUPPORT

/*****************************************************************************
  QColor stream functions
 *****************************************************************************/

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QColor &c)
{
#ifndef Q_BROKEN_DEBUG_STREAM
    if (!c.isValid())
        dbg.nospace() << "QColor(Invalid)";
    else if (c.spec() == QColor::Rgb)
        dbg.nospace() << "QColor(ARGB " << c.alphaF() << ", " << c.redF() << ", " << c.greenF() << ", " << c.blueF() << ')';
    else if (c.spec() == QColor::Hsv)
        dbg.nospace() << "QColor(AHSV " << c.alphaF() << ", " << c.hueF() << ", " << c.saturationF() << ", " << c.valueF() << ')';
    else if (c.spec() == QColor::Cmyk)
        dbg.nospace() << "QColor(ACMYK " << c.alphaF() << ", " << c.cyanF() << ", " << c.magentaF() << ", " << c.yellowF() << ", "
                      << c.blackF()<< ')';
    else if (c.spec() == QColor::Hsl)
        dbg.nospace() << "QColor(AHSL " << c.alphaF() << ", " << c.hslHueF() << ", " << c.hslSaturationF() << ", " << c.lightnessF() << ')';

    return dbg.space();
#else
    qWarning("This compiler doesn't support streaming QColor to QDebug");
    return dbg;
    Q_UNUSED(c);
#endif
}
#endif

#ifndef QT_NO_DATASTREAM

QDataStream &operator<<(QDataStream &stream, const QColor &color)
{
    if (stream.version() < 7) {
        if (!color.isValid())
            return stream << quint32(0x49000000);
        quint32 p = (quint32)color.rgb();
        if (stream.version() == 1) // Swap red and blue
            p = ((p << 16) & 0xff0000) | ((p >> 16) & 0xff) | (p & 0xff00ff00);
        return stream << p;
    }

    qint8   s = color.cspec;
    quint16 a = color.ct.argb.alpha;
    quint16 r = color.ct.argb.red;
    quint16 g = color.ct.argb.green;
    quint16 b = color.ct.argb.blue;
    quint16 p = color.ct.argb.pad;

    stream << s;
    stream << a;
    stream << r;
    stream << g;
    stream << b;
    stream << p;

    return stream;
}

QDataStream &operator>>(QDataStream &stream, QColor &color)
{
    if (stream.version() < 7) {
        quint32 p;
        stream >> p;
        if (p == 0x49000000) {
            color.invalidate();
            return stream;
        }
        if (stream.version() == 1) // Swap red and blue
            p = ((p << 16) & 0xff0000) | ((p >> 16) & 0xff) | (p & 0xff00ff00);
        color.setRgb(p);
        return stream;
    }

    qint8 s;
    quint16 a, r, g, b, p;
    stream >> s;
    stream >> a;
    stream >> r;
    stream >> g;
    stream >> b;
    stream >> p;

    color.cspec = QColor::Spec(s);
    color.ct.argb.alpha = a;
    color.ct.argb.red   = r;
    color.ct.argb.green = g;
    color.ct.argb.blue  = b;
    color.ct.argb.pad   = p;

    return stream;
}
#endif // QT_NO_DATASTREAM


/*****************************************************************************
  QColor global functions (documentation only)
 *****************************************************************************/

QT_END_NAMESPACE