/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

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

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


/*!
    \class QColor
    \brief The QColor class provides colors based on RGB, HSV or CMYK values.

    \ingroup multimedia
    \ingroup appearance
    \mainclass

    A color is normally specified in terms of RGB (red, green, and
    blue) components, but it is also possible to specify it in terms
    of HSV (hue, saturation, and value) and CMYK (cyan, magenta,
    yellow and black) components. In addition a color can be specified
    using a color name. The color name can be any of the SVG 1.0 color
    names.

    \table
    \row
    \o \inlineimage qcolor-rgb.png
    \o \inlineimage qcolor-hsv.png
    \o \inlineimage qcolor-cmyk.png
    \header
    \o RGB \o HSV \o CMYK
    \endtable

    The QColor constructor creates the color based on RGB values.  To
    create a QColor based on either HSV or CMYK values, use the
    toHsv() and toCmyk() functions respectively. These functions
    return a copy of the color using the desired format. In addition
    the static fromRgb(), fromHsv() and fromCmyk() functions create
    colors from the specified values. Alternatively, a color can be
    converted to any of the three formats using the convertTo()
    function (returning a copy of the color in the desired format), or
    any of the setRgb(), setHsv() and setCmyk() functions altering \e
    this color's format. The spec() function tells how the color was
    specified.

    A color can be set by passing an RGB string (such as "#112233"),
    or a color name (such as "blue"), to the setNamedColor() function.
    The color names are taken from the SVG 1.0 color names. The name()
    function returns the name of the color in the format
    #AARRGGBB. Colors can also be set using setRgb(), setHsv() and
    setCmyk(). To get a lighter or darker color use the light() and
    dark() functions respectively.

    The isValid() function indicates whether a QColor is legal at
    all. For example, a RGB color with RGB values out of range is
    illegal. For performance reasons, QColor mostly disregards illegal
    colors, and for that reason, the result of using an invalid color
    is undefined.

    The color components can be retrieved individually, e.g with
    red(), hue() and cyan(). The values of the color components can
    also be retrieved in one go using the getRgb(), getHsv() and
    getCmyk() functions. Using the RGB color model, the color
    components can in addition be accessed with rgb().

    There are several related non-members: QRgb is a typdef for an
    unsigned int representing the RGB value triplet (r, g, b). Note
    that it also can hold a value for the alpha-channel (for more
    information, see the \l {QColor#Alpha-Blended
    Drawing}{Alpha-Blended Drawing} section). The qRed(), qBlue() and
    qGreen() functions return the respective component of the given
    QRgb value, while the qRgb() and qRgba() functions create and
    return the QRgb triplet based on the given component
    values. Finally, the qAlpha() function returns the alpha component
    of the provided QRgb, and the qGray() function calculates and
    return a gray value based on the given value.

    QColor is platform and device independent. The QColormap class
    maps the color to the hardware.

    For more information about painting in general, see {The Paint
    System} documentation.

    \tableofcontents

    \section1 Integer vs. Floating Point Precision

    QColor supports floating point precision and provides floating
    point versions of all the color components functions,
    e.g. getRgbF(), hueF() and fromCmykF(). Note that since the
    components is stored using 16-bit integers, there might be minor
    deviations between the values set using, for example, setRgbF()
    and the values returned by the getRgbF() function due to rounding.

    While the integer based functions take values in the range 0-255
    (except hue() which must can be specified within the range 0-359),
    the floating point functions accept values in the range 0.0 - 1.0.

    \section1 Alpha-Blended Drawing

    QColor also support alpha-blended outlining and filling. The
    alpha channel of a color specifies the transparency effect, 0
    represents a fully transparent color, while 255 represents a fully
    opaque color. For example:

    \code
    // Specfiy semi-transparent red
    painter.setBrush(QColor(255, 0, 0, 127));
    painter.drawRect(0, 0, width()/2, height());

    // Specify semi-transparend blue
    painter.setBrush(QColor(0, 0, 255, 127));
    painter.drawRect(0, 0, width(), height()/2);
    \endcode

    The code above produces the following output:

    \img alphafill.png

    Alpha-blended drawing is supported on Windows, Mac OS X, and on
    X11 systems that have the X Render extension installed.

    The alpha channel of a color can be retrieved and set using the
    alpha() and setAlpha() functions if its value is an integer, and
    alphaF() and setAlphaF() if its value is qreal (double). By
    default, the alpha-channel is set to 255 (opaque). To retrieve and
    set \e all the RGB color components (including the alpha-channel)
    in one go, use the rgba() and setRgba() functions.

    \section1 Predefined Colors

    There are 20 predefined QColors: Qt::white, Qt::black,
    Qt::red, Qt::darkRed, Qt::green, Qt::darkGreen, Qt::blue,
    Qt::darkBlue, Qt::cyan, Qt::darkCyan, Qt::magenta,
    Qt::darkMagenta, Qt::yellow, Qt::darkYellow, Qt::gray,
    Qt::darkGray, Qt::lightGray, Qt::color0, Qt::color1, and
    Qt::transparent.

    \img qt-colors.png Qt Colors

    QColor provides the static colorNames() function which returns a
    QStringList containing the color names Qt knows about.

    The colors Qt::color0 (zero pixel value) and Qt::color1 (non-zero
    pixel value) are special colors for drawing in QBitmaps. Painting with
    Qt::color0 sets the bitmap bits to 0 (transparent, i.e. background), and
    painting with Qt::color1 sets the bits to 1 (opaque, i.e. foreground).

    \section1 The HSV Color Model

    The RGB model is hardware-oriented. Its representation is close to
    what most monitors show. In contrast, HSV represents color in a way
    more suited to the human perception of color. For example, the
    relationships "stronger than", "darker than", and "the opposite of"
    are easily expressed in HSV but are much harder to express in RGB.

    HSV, like RGB, has three components:

    \list
    \o H, for hue, is in the range 0 to 359 if the color is chromatic (not
    gray), or meaningless if it is gray. It represents degrees on the
    color wheel familiar to most people. Red is 0 (degrees), green is
    120, and blue is 240.

    \inlineimage qcolor-hue.png

    \o S, for saturation, is in the range 0 to 255, and the bigger it is,
    the stronger the color is. Grayish colors have saturation near 0; very
    strong colors have saturation near 255.

    \inlineimage qcolor-saturation.png

    \o V, for value, is in the range 0 to 255 and represents lightness or
    brightness of the color. 0 is black; 255 is as far from black as
    possible.

    \inlineimage qcolor-value.png
    \endlist

    Here are some examples: pure red is H=0, S=255, V=255; a dark red,
    moving slightly towards the magenta, could be H=350 (equivalent to
    -10), S=255, V=180; a grayish light red could have H about 0 (say
    350-359 or 0-10), S about 50-100, and S=255.

    Qt returns a hue value of -1 for achromatic colors. If you pass a
    hue value that is too large, Qt forces it into range. Hue 360 or 720 is
    treated as 0; hue 540 is treated as 180.

    In addition to the standard HSV model, Qt provides an
    alpha-channel to feature \l {QColor#Alpha-Blended
    Drawing}{alpha-blended drawing}.

    \section1 The CMYK Color Model

    While the RGB and HSV color models are used for display on
    computer monitors, the CMYK model is used in the four-color
    printing process of printing presses and some hard-copy
    devices.

    CMYK has four components, all in the range 0-255: cyan (C),
    magenta (M), yellow (Y) and black (K).  Cyan, magenta and yellow
    are called subtractive colors; the CMYK color model creates color
    by starting with a white surface and then subtracting color by
    applying the appropriate components. While combining cyan, magenta
    and yellow gives the color black, subtracting one or more will
    yield any other color. When combined in various percentages, these
    three colors can create the entire spectrum of colors.

    Mixing 100 percent of cyan, magenta and yellow \e does produce
    black, but the result is unsatisfactory since it wastes ink,
    increases drying time, and gives a muddy colour when printing. For
    that reason, black is added in professional printing to provide a
    solid black tone; hence the term 'four color process'.

    In addition to the standard CMYK model, Qt provides an
    alpha-channel to feature \l {QColor#Alpha-Blended
    Drawing}{alpha-blended drawing}.

    \sa QPalette, QBrush, QApplication::setColorSpec()
*/


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

/*!
    \enum QColor::Spec

    The type of color specified, either RGB, HSV or CMYK.

    \value Rgb
    \value Hsv
    \value Cmyk
    \value Invalid

    \sa spec(), convertTo()
*/

/*!
    \fn Spec QColor::spec() const

    Returns how the color was specified.

    \sa Spec, convertTo()
*/


/*!
    \fn QColor::QColor()

    Constructs an invalid color with the RGB value (0, 0, 0). An
    invalid color is a color that is not properly set up for the
    underlying window system.

    The alpha value of an invalid color is unspecified.

    \sa isValid()
*/

/*!
    \overload

    Constructs a new color with a color value of \a color.

    \sa isValid(), {QColor#Predefined Colors}{Predefined Colors}
 */
QColor::QColor(Qt::GlobalColor color)
{
#define QRGB(r, g, b) \
    QRgb(((0xff << 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]));
}

/*!
    \fn QColor::QColor(int r, int g, int b, int a = 255)

    Constructs a color with the RGB value \a r, \a g, \a b, and the
    alpha-channel (transparency) value of \a a.

    The color is left invalid if any of the arguments are invalid.

    \sa setRgba(), isValid()
*/

/*!
    Constructs a color with the value \a color. The alpha component is
    ignored and set to solid.

    \sa fromRgb(), isValid()
*/

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;
}


/*!
    \fn QColor::QColor(const QString &name)

    Constructs a named color in the same way as setNamedColor() using
    the given \a name.

    The color is left invalid if the \a name cannot be parsed.

    \sa setNamedColor(), name(), isValid()
*/

/*!
    \fn QColor::QColor(const char *name)

    Constructs a named color in the same way as setNamedColor() using
    the given \a name.

    The color is left invalid if the \a name cannot be parsed.

    \sa setNamedColor(), name(), isValid()
*/

/*!
    \fn QColor::QColor(const QColor &color)

    Constructs a color that is a copy of \a color.

    \sa isValid()
*/

/*!
    \fn bool QColor::isValid() const

    Returns true if the color is valid; otherwise returns false.
*/

/*!
    Returns the name of the color in the format "#RRGGBB"; i.e. a "#"
    character followed by three two-digit hexadecimal numbers.

    \sa setNamedColor()
*/

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

/*!
    Sets the RGB value of this QColor to \a name, which may be in one
    of these formats:

    \list
    \i #RGB (each of R, G, and B is a single hex digit)
    \i #RRGGBB
    \i #RRRGGGBBB
    \i #RRRRGGGGBBBB
    \i A name from the list of colors defined in the list of \l{SVG color keyword names}
       provided by the World Wide Web Consortium; for example, "steelblue" or "gainsboro".
       These color names work on all platforms.
    \i \c transparent - representing the absence of a color.
    \endlist

    The color is invalid if \a name cannot be parsed.

    \sa QColor(), name(), isValid()
*/

void QColor::setNamedColor(const QString &name)
{
    if (name.isEmpty()) {
        invalidate();
        return;
    }

    QByteArray n = name.toLatin1();
    if (name[0] == '#') {
        QRgb rgb;
        if (qt_get_hex_rgb(n, &rgb)) {
            setRgb(rgb);
        } else {
            qWarning("QColor::setNamedColor: could not parse color '%s'", n.constData());
            invalidate();
        }
        return;
    }

    QRgb rgb;
    if (qt_get_named_rgb(n, &rgb)) {
        setRgb(rgb);
    } else {
        qWarning("QColor::setNamedColor: unknown color name '%s'", n.constData());
        invalidate();
    }
}

/*!
    Returns a QStringList containing the color names Qt knows about.

    \sa {QColor#Predefined Colors}{Predefined Colors}
*/
QStringList QColor::colorNames()
{
    return qt_get_colornames();
}

/*!
    Sets the contents pointed to by \a h, \a s, \a v, and \a a, to the
    hue, saturation, value, and alpha-channel (transparency)
    components of the color's HSV value.

    Note that the components can be retrieved individually using the
    hueF(), saturationF(), valueF() and alphaF() functions.

    \sa setHsv() {QColor#The HSV Color Model}{The HSV Color Model}
*/
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 ? -1.0 : ct.ahsv.hue / 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);
}

/*!
    Sets the contents pointed to by \a h, \a s, \a v, and \a a, to the
    hue, saturation, value, and alpha-channel (transparency)
    components of the color's HSV value.

    Note that the components can be retrieved individually using the
    hue(), saturation(), value() and alpha() functions.

    \sa setHsv(), {QColor#The HSV Color Model}{The HSV Color Model}
*/
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;
}

/*!
    Sets a HSV color value; \a h is the hue, \a s is the saturation,
    \a v is the value and \a a is the alpha component of the HSV
    color.

    All the values must be in the range 0.0-1.0.

    \sa getHsvF(), setHsv(), {QColor#The HSV Color Model}{The HSV
    Color Model}
*/
void QColor::setHsvF(qreal h, qreal s, qreal v, qreal a)
{
    if (((h < 0.0 || h > 1.0) && h != -1.0)
        || (s < 0.0 || s > 1.0)
        || (v < 0.0 || v > 1.0)
        || (a < 0.0 || a > 1.0)) {
        qWarning("QColor::setHsv: HSV parameters out of range");
        return;
    }

    cspec = Hsv;
    ct.ahsv.alpha      = qRound(a * USHRT_MAX);
    ct.ahsv.hue        = h == -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;
}

/*!
    Sets a HSV color value; \a h is the hue, \a s is the saturation,
    \a v is the value and \a a is the alpha component of the HSV
    color.

    The saturation, value and alpha-channel values must be in the
    range 0-255, and the hue value must be greater than -1.

    \sa getHsv(), setHsvF(), {QColor#The HSV Color Model}{The HSV
    Color Model}
*/
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;
}

/*!
    Sets the contents pointed to by \a r, \a g, \a b, and \a a, to the
    red, green, blue, and alpha-channel (transparency) components of
    the color's RGB value.

    Note that the components can be retrieved individually using the
    redF(), greenF(), blueF() and alphaF() functions.

    \sa rgb(), setRgb()
*/
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);

}

/*!
    Sets the contents pointed to by \a r, \a g, \a b, and \a a, to the
    red, green, blue, and alpha-channel (transparency) components of
    the color's RGB value.

    Note that the components can be retrieved individually using the
    red(), green(), blue() and alpha() functions.

    \sa rgb(), setRgb()
*/
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;
}

/*!
    \obsolete
    \fn void QColor::getRgba(int *r, int *g, int *b, int *a) const

    Use getRgb() instead.
*/

/*!
    \fn void QColor::setRgbF(qreal r, qreal g, qreal b, qreal a)

    Sets the color channels of this color to \a r (red), \a g (green),
    \a b (blue) and \a a (alpha, transparency).

    All values must be in the range 0.0-1.0.

    \sa rgb(), getRgbF(), setRgb()
*/
void QColor::setRgbF(qreal r, qreal g, qreal b, qreal a)
{
    if (r < 0.0 || r > 1.0
        || g < 0.0 || g > 1.0
        || b < 0.0 || b > 1.0
        || a < 0.0 || a > 1.0) {
        qWarning("QColor::setRgb: RGB parameter(s) 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;
}

/*!
    Sets the RGB value to \a r, \a g, \a b and the alpha value to \a
    a.

    All the values must be in the range 0-255.

    \sa rgb(), getRgb(), setRgbF()
*/
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 parameter(s) 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;
}

/*!
    \obsolete
    \fn void QColor::setRgba(int r, int g, int b, int a)

    Use setRgb() instead.
*/

/*!
    \fn QRgb QColor::rgba() const

    Returns the RGB value of the color. Note that unlike rgb(), the
    alpha is not stripped.

    For an invalid color, the alpha value of the returned color is
    unspecified.

    \sa setRgba(), rgb()
*/

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);
}

/*!
    Sets the RGBA value to \a rgba. Note that unlike setRgb(QRgb rgb),
    this function does not ignore the alpha.

    \sa rgba(), rgb()
*/
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;
}

/*!
    \fn QRgb QColor::rgb() const

    Returns the RGB value of the color. The alpha is stripped for compatibility.

    \sa getRgb(), rgba()
*/
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);
}

/*!
    \overload

    Sets the RGB value to \a rgb, ignoring the alpha.
*/
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;
}

/*!
    Returns the alpha color component of this color.

    \sa setAlpha(), alphaF(), {QColor#Alpha-Blended
    Drawing}{Alpha-Blended Drawing}
*/
int QColor::alpha() const
{ return ct.argb.alpha >> 8; }


/*!
    Sets the alpha of this color to \a alpha. Integer alpha is
    specified in the range 0-255.

    \sa alpha(), alphaF(), {QColor#Alpha-Blended
    Drawing}{Alpha-Blended Drawing}
*/

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

/*!
    Returns the alpha color component of this color.

    \sa setAlphaF(), alpha(),  {QColor#Alpha-Blended
    Drawing}{Alpha-Blended Drawing}
*/
qreal QColor::alphaF() const
{ return ct.argb.alpha / qreal(USHRT_MAX); }

/*!
    Sets the alpha of this color to \a alpha. qreal alpha is
    specified in the range 0.0-1.0.

    \sa alphaF(), alpha(), {QColor#Alpha-Blended
    Drawing}{Alpha-Blended Drawing}

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


/*!
    Returns the red color component of this color.

    \sa setRed(), redF(), getRgb()
*/
int QColor::red() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().red();
    return ct.argb.red >> 8;
}

/*!
    Sets the red color component of this color to \a red. Int
    components are specified in the range 0-255.

    \sa red(), redF(), setRgb()
*/
void QColor::setRed(int red)
{
    ct.argb.red = red * 0x101;
}

/*!
    Returns the green color component of this color.

    \sa setGreen(), greenF(), getRgb()
*/
int QColor::green() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().green();
    return ct.argb.green >> 8;
}

/*!
    Sets the green color component of this color to \a green. Int
    components are specified in the range 0-255.

    \sa green(), greenF(),  setRgb()
*/
void QColor::setGreen(int green)
{
    ct.argb.green = green * 0x101;
}


/*!
    Returns the blue color component of this color.

    \sa setBlue(), blueF(), getRgb()
*/
int QColor::blue() const
{
    if (cspec != Invalid && cspec != Rgb)
        return toRgb().blue();
    return ct.argb.blue >> 8;
}


/*!
    Sets the blue color component of this color to \a blue. Int
    components are specified in the range 0-255.

    \sa blue(), blueF(), setRgb()
*/
void QColor::setBlue(int blue)
{
    ct.argb.blue = blue * 0x101;
}

/*!
    Returns the red color component of this color.

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


/*!
    Sets the red color component of this color to \a red. Float
    components are specified in the range 0.0-1.0.

    \sa redF(), red(), setRgbF()
*/
void QColor::setRedF(qreal red)
{
    ct.argb.red = qRound(red * USHRT_MAX);
}

/*!
    Returns the green color component of this color.

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


/*!
    Sets the green color component of this color to \a green. Float
    components are specified in the range 0.0-1.0.

    \sa greenF(), green(), setRgbF()
*/
void QColor::setGreenF(qreal green)
{
    ct.argb.green = qRound(green * USHRT_MAX);
}

/*!
    Returns the blue color component of this color.

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

/*!
    Sets the blue color component of this color to \a blue. Float
    components are specified in the range 0.0-1.0.

    \sa blueF(), blue(), setRgbF()
*/
void QColor::setBlueF(qreal blue)
{
    ct.argb.blue = qRound(blue * USHRT_MAX);
}

/*!
    Returns the hue color component of this color.

    \sa hueF(), getHsv(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
int QColor::hue() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().hue();
    return ct.ahsv.hue == USHRT_MAX ? -1 : ct.ahsv.hue / 100;
}

/*!
    Returns the saturation color component of this color.

    \sa saturationF(), getHsv(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
int QColor::saturation() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().saturation();
    return ct.ahsv.saturation >> 8;
}

/*!
    Returns the value color component of this color.

    \sa valueF(), getHsv(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
int QColor::value() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().value();
    return ct.ahsv.value >> 8;
}

/*!
    Returns the hue color component of this color.

    \sa hue(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
qreal QColor::hueF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().hueF();
    return ct.ahsv.hue == USHRT_MAX ? -1.0 : ct.ahsv.hue / 36000.0;
}

/*!
    Returns the saturation color component of this color.

    \sa saturation() getHsvF(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
qreal QColor::saturationF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().saturationF();
    return ct.ahsv.saturation / qreal(USHRT_MAX);
}

/*!
    Returns the value color component of this color.

    \sa value() getHsvF(), {QColor#The HSV Color Model}{The HSV Color
    Model}
*/
qreal QColor::valueF() const
{
    if (cspec != Invalid && cspec != Hsv)
        return toHsv().valueF();
    return ct.ahsv.value / qreal(USHRT_MAX);
}

/*!
    Returns the cyan color component of this color.

    \sa cyanF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
int QColor::cyan() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().cyan();
    return ct.acmyk.cyan >> 8;
}

/*!
    Returns the magenta color component of this color.

    \sa magentaF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
int QColor::magenta() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().magenta();
    return ct.acmyk.magenta >> 8;
}

/*!
    Returns the yellow color component of this color.

    \sa yellowF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
int QColor::yellow() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().yellow();
    return ct.acmyk.yellow >> 8;
}

/*!
    Returns the black color component of this color.

    \sa blackF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}

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

/*!
    Returns the cyan color component of this color.

    \sa cyan(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
qreal QColor::cyanF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().cyanF();
    return ct.acmyk.cyan / qreal(USHRT_MAX);
}

/*!
    Returns the magenta color component of this color.

    \sa magenta(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
qreal QColor::magentaF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().magentaF();
    return ct.acmyk.magenta / qreal(USHRT_MAX);
}

/*!
    Returns the yellow color component of this color.

     \sa yellow(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
qreal QColor::yellowF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().yellowF();
    return ct.acmyk.yellow / qreal(USHRT_MAX);
}

/*!
    Returns the black color component of this color.

    \sa black(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
qreal QColor::blackF() const
{
    if (cspec != Invalid && cspec != Cmyk)
        return toCmyk().blackF();
    return ct.acmyk.black / qreal(USHRT_MAX);
}

/*!
    Create and returns an RGB QColor based on this color.

    \sa fromRgb(), convertTo(), isValid()
*/
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 / 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 * (1.0 - s);

            if (i & 1) {
                const qreal q = v * (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 * (1.0 - (s * (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 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((1.0 - (c * (1.0 - k) + k)) * USHRT_MAX);
            color.ct.argb.green = qRound((1.0 - (m * (1.0 - k) + k)) * USHRT_MAX);
            color.ct.argb.blue  = qRound((1.0 - (y * (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) )


/*!
    Creates and returns an HSV QColor based on this color.

    \sa fromHsv(), convertTo(), isValid(), {QColor#The HSV Color
    Model}{The HSV Color Model}
*/
QColor QColor::toHsv() const
{
    if (!isValid())
        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 (delta == 0.0) {
        // 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 (r == max) {
            hue = ((g - b) /delta);
        } else if (g == max) {
            hue = (2.0 + (b - r) / delta);
        } else if (b == max) {
            hue = (4.0 + (r - g) / delta);
        } else {
            Q_ASSERT_X(false, "QColor::toHsv", "internal error");
        }
        hue *= 60.0;
        if (hue < 0.0)
            hue += 360.0;
        color.ct.ahsv.hue = qRound(hue * 100);
    }

    return color;
}

/*!
    Creates and returns a CMYK QColor based on this color.

    \sa fromCmyk(), convertTo(), isValid(), {QColor#The CMYK Color
    Model}{The CMYK Color Model}
*/
QColor QColor::toCmyk() const
{
    if (!isValid())
        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 = 1.0 - r;
    qreal m = 1.0 - g;
    qreal y = 1.0 - b;

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

    if (!qFuzzyCompare(k,1)) {
        c = (c - k) / (1.0 - k);
        m = (m - k) / (1.0 - k);
        y = (y - k) / (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 Invalid:
        break;
    }
    return QColor(); // must be invalid
}


/*!
    Static convenience function that returns a QColor constructed from
    the given QRgb value \a rgb.

    Note that the alpha component of \a rgb is ignored (i.e. it is
    automatically set to 255), use the fromRgba() function to include the
    alpha-channel specified by the given QRgb value.

    \sa fromRgba(), fromRgbF(), toRgb(), isValid()
*/

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


/*!
    Static convenience function that returns a QColor constructed from
    the given QRgb value \a rgba.

    Note that unlike the fromRgb() function, the alpha-channel
    specified by the given QRgb value is included.

    \sa fromRgb(), isValid()
*/

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

/*!
    Static convenience function that returns a QColor constructed from
    the RGB color values, \a r (red), \a g (green), \a b (blue),
    and \a a (alpha-channel, i.e. transparency).

    All the values must be in the range 0-255.

    \sa toRgb(), fromRgbF(), isValid()
*/
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 paramaters 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;
}

/*!
    Static convenience function that returns a QColor constructed from
    the RGB color values, \a r (red), \a g (green), \a b (blue), and
    \a a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    \sa fromRgb(), toRgb(), isValid()
*/
QColor QColor::fromRgbF(qreal r, qreal g, qreal b, qreal a)
{
    if (r < 0.0 || r > 1.0
        || g < 0.0 || g > 1.0
        || b < 0.0 || b > 1.0
        || a < 0.0 || a > 1.0) {
        qWarning("QColor::fromRgb: RGB paramaters 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;
}

/*!
    Static convenience function that returns a QColor constructed from
    the HSV color values, \a h (hue), \a s (saturation), \a v (value),
    and \a a (alpha-channel, i.e. transparency).

    The value of \a s, \a v, and \a a must all be in the range
    0-255; the value of \a h must be in the range 0-359.

    \sa toHsv(), fromHsvF(), isValid(), {QColor#The HSV Color
    Model}{The HSV Color Model}
*/
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;
}

/*!
    \overload

    Static convenience function that returns a QColor constructed from
    the HSV color values, \a h (hue), \a s (saturation), \a v (value),
    and \a a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    \sa toHsv(), fromHsv(), isValid(), {QColor#The HSV Color
    Model}{The HSV Color Model}
*/
QColor QColor::fromHsvF(qreal h, qreal s, qreal v, qreal a)
{
    if (((h < 0.0 || h > 1.0) && h != -1.0)
        || (s < 0.0 || s > 1.0)
        || (v < 0.0 || v > 1.0)
        || (a < 0.0 || a > 1.0)) {
        qWarning("QColor::fromHsv: 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 == -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;
}

/*!
    Sets the contents pointed to by \a c, \a m, \a y, \a k, and \a a,
    to the cyan, magenta, yellow, black, and alpha-channel
    (transparency) components of the color's CMYK value.

    Note that the components can be retrieved individually using the
    cyan(), magenta(), yellow(), black() and alpha() functions.

    \sa setCmyk(), {QColor#The CMYK Color Model}{The CMYK Color Model}
*/
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;
}

/*!
    Sets the contents pointed to by \a c, \a m, \a y, \a k, and \a a,
    to the cyan, magenta, yellow, black, and alpha-channel
    (transparency) components of the color's CMYK value.

    Note that the components can be retrieved individually using the
    cyanF(), magentaF(), yellowF(), blackF() and alphaF() functions.

    \sa setCmykF(), {QColor#The CMYK Color Model}{The CMYK Color Model}
*/
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);
}

/*!
    Sets the color to CMYK values, \a c (cyan), \a m (magenta), \a y (yellow),
    \a k (black), and \a a (alpha-channel, i.e. transparency).

    All the values must be in the range 0-255.

    \sa getCmyk(), setCmykF(), {QColor#The CMYK Color Model}{The
    CMYK Color Model}
*/
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 paramaters 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;
}

/*!
    \overload

    Sets the color to CMYK values, \a c (cyan), \a m (magenta), \a y (yellow),
    \a k (black), and \a a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    \sa getCmykF() setCmyk(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
void QColor::setCmykF(qreal c, qreal m, qreal y, qreal k, qreal a)
{
    if (c < 0.0 || c > 1.0
        || m < 0.0 || m > 1.0
        || y < 0.0 || y > 1.0
        || k < 0.0 || k > 1.0
        || a < 0.0 || a > 1.0) {
        qWarning("QColor::setCmyk: CMYK paramaters 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);
}

/*!
    Static convenience function that returns a QColor constructed from
    the given CMYK color values: \a c (cyan), \a m (magenta), \a y
    (yellow), \a k (black), and \a a (alpha-channel,
    i.e. transparency).

    All the values must be in the range 0-255.

    \sa toCmyk(), fromCmykF(), isValid(), {QColor#The CMYK Color Model}{The CMYK
    Color Model}
*/
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 paramaters 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;
}

/*!
    \overload

    Static convenience function that returns a QColor constructed from
    the given CMYK color values: \a c (cyan), \a m (magenta), \a y
    (yellow), \a k (black), and \a a (alpha-channel,
    i.e. transparency).

    All the values must be in the range 0.0-1.0.

    \sa toCmyk(), fromCmyk(), isValid(), {QColor#The CMYK Color
    Model}{The CMYK Color Model}
*/
QColor QColor::fromCmykF(qreal c, qreal m, qreal y, qreal k, qreal a)
{
    if (c < 0.0 || c > 1.0
        || m < 0.0 || m > 1.0
        || y < 0.0 || y > 1.0
        || k < 0.0 || k > 1.0
        || a < 0.0 || a > 1.0) {
        qWarning("QColor::fromCmyk: CMYK paramaters 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;
}

/*!
    Returns a lighter (or darker) color, but does not change this
    object.

    If the \a factor is greater than 100, this functions returns a
    lighter color. Setting \a factor to 150 returns a color that is
    50% brighter. If the \a factor is less than 100, the return color
    is darker, but we recommend using the dark() function for this
    purpose. If the \a factor is 0 or negative, the return value is
    unspecified.

    The function converts the current RGB color to HSV, multiplies the
    value (V) component by \a factor and converts the color back to
    RGB.

    \sa dark(), isValid()
*/
QColor QColor::light(int factor) const
{
    if (factor <= 0)                                // invalid lightness factor
        return *this;
    else if (factor < 100)                        // makes color darker
        return dark(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);
}

/*!
    Returns a darker (or lighter) color, but does not change this
    object.

    If the \a factor is greater than 100, this functions returns a
    darker color. Setting \a factor to 300 returns a color that has
    one-third the brightness. If the \a factor is less than 100, the
    return color is lighter, but we recommend using the light()
    function for this purpose. If the \a factor is 0 or negative, the
    return value is unspecified.

    The function converts the current RGB color to HSV, divides the
    value (V) component by \a factor and converts the color back to
    RGB.

    \sa light(), isValid()
*/
QColor QColor::dark(int factor) const
{
    if (factor <= 0)                                // invalid darkness factor
        return *this;
    else if (factor < 100)                        // makes color lighter
        return light(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);
}

/*!
    Assigns a copy of the color \a color to this color, and returns a
    reference to it.
*/
QColor &QColor::operator=(const QColor &color)
{
    cspec = color.cspec;
    ct.argb = color.ct.argb;
    return *this;
}

/*! \overload
    Assigns a copy of the \a color and returns a reference to this color.
 */
QColor &QColor::operator=(Qt::GlobalColor color)
{
    return operator=(QColor(color));
}

/*!
    Returns true if this color has the same RGB value as the color \a
    color; otherwise returns false.
*/
bool QColor::operator==(const QColor &color) const
{
    return (cspec == color.cspec
            && ct.argb.alpha == color.ct.argb.alpha
            && ct.argb.red   == color.ct.argb.red
            && ct.argb.green == color.ct.argb.green
            && ct.argb.blue  == color.ct.argb.blue
            && ct.argb.pad   == color.ct.argb.pad);
}

/*!
    Returns true if this color has a different RGB value from the
    color \a color; otherwise returns false.
*/
bool QColor::operator!=(const QColor &color) const
{ return !operator==(color); }


/*!
   Returns the color as a QVariant
*/
QColor::operator QVariant() const
{
    return QVariant(QVariant::Color, this);
}

/*! \internal

    Marks the color as invalid and sets all components to zero (alpha
    is set to fully opaque for compatibility with Qt 3).
*/
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

/*!
    Returns the pixel value used by the underlying window system to
    refer to a color.

    Use QColormap::pixel() instead.

    \oldcode
        QColor myColor;
        uint pixel = myColor.pixel(screen);
    \newcode
        QColormap cmap = QColormap::instance(screen);
        uint pixel  = cmap.pixel(*this);
    \endcode
*/
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()<< ")";

    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
/*!
    \fn QDataStream &operator<<(QDataStream &stream, const QColor &color)
    \relates QColor

    Writes the \a color to the \a stream.

    \sa {Format of the QDataStream Operators}
*/
QDataStream &operator<<(QDataStream &stream, const QColor &color)
{
    if (stream.version() < 7) {
        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;
}

/*!
    \fn QDataStream &operator>>(QDataStream &stream, QColor &color)

    \relates QColor
    Reads the \a color from the \a stream.

    \sa { Format of the QDataStream Operators}
*/
QDataStream &operator>>(QDataStream &stream, QColor &color)
{
    if (stream.version() < 7) {
        quint32 p;
        stream >> p;
        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




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

/*!
    \fn int qRed(QRgb rgb)
    \relates QColor

    Returns the red component of the ARGB quadruplet \a rgb.

    \sa qRgb(), QColor::red()
*/

/*!
    \fn int qGreen(QRgb rgb)
    \relates QColor

    Returns the green component of the ARGB quadruplet \a rgb.

    \sa qRgb(), QColor::green()
*/

/*!
    \fn int qBlue(QRgb rgb)
    \relates QColor

    Returns the blue component of the ARGB quadruplet \a rgb.

    \sa qRgb(), QColor::blue()
*/

/*!
    \fn int qAlpha(QRgb rgba)
    \relates QColor

    Returns the alpha component of the ARGB quadruplet \a rgba.

    \sa qRgb(), QColor::alpha()
*/

/*!
    \fn QRgb qRgb(int r, int g, int b)
    \relates QColor

    Returns the ARGB quadruplet (255, \a{r}, \a{g}, \a{b}).

    \sa qRgba(), qRed(), qGreen(), qBlue()
*/

/*!
    \fn QRgb qRgba(int r, int g, int b, int a)
    \relates QColor

    Returns the ARGB quadruplet (\a{a}, \a{r}, \a{g}, \a{b}).

    \sa qRgb(), qRed(), qGreen(), qBlue()
*/

/*!
    \fn int qGray(int r, int g, int b)
    \relates QColor

    Returns a gray value (0 to 255) from the (\a r, \a g, \a b)
    triplet.

    The gray value is calculated using the formula (\a r * 11 + \a g *
    16 + \a b * 5)/32.
*/

/*!
    \fn int qGray(QRgb rgb)
    \overload
    \relates QColor

    Returns a gray value (0 to 255) from the given ARGB quadruplet \a
    rgb.

    The gray value is calculated using the formula (R * 11 + G *
    16 + B * 5)/32.  Note that the alpha-channel is ignored.
*/

/*!
    \fn QColor::QColor(int x, int y, int z, Spec colorSpec)

    Use one of the other QColor constructors, or one of the static
    convenience functions, instead.
*/

/*!
    \fn QColor::rgb(int *r, int *g, int *b) const

    Use getRgb() instead.
*/

/*!
    \fn QColor::hsv(int *h, int *s, int *v) const

    Use getHsv() instead.
*/

/*!
    \fn QColor QColor::convertTo(Spec colorSpec) const

    Creates a copy of \e this color in the format specified by \a
    colorSpec.

    \sa spec(), toCmyk(), toHsv(), toRgb(), isValid()
*/

/*!
    \typedef QRgb
    \relates QColor

    An ARGB quadruplet on the format #AARRGGBB, equivalent to an
    unsigned int.

    Note that the type also holds a value for the alpha-channel. The
    default alpha channel is \c ff, i.e opaque. For more information,
    see the \l {QColor#Alpha-Blended Drawing}{Alpha-Blended Drawing}
    section.

    \sa QColor::rgb(), QColor::rgba()
*/
