qcolor.cpp

奇趣公司比较新的qt/emd版本

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)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setAlphaF", 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)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setRed", red);
    if (cspec != Rgb)
        setRgb(red, green(), blue(), alpha());
    else
        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)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setGreen", green);
    if (cspec != Rgb)
        setRgb(red(), green, blue(), alpha());
    else
        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)
{
    QCOLOR_INT_RANGE_CHECK("QColor::setBlue", blue);
    if (cspec != Rgb)
        setRgb(red(), green(), blue, alpha());
    else
        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)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setRedF", red);
    if (cspec != Rgb)
        setRgbF(red, greenF(), blueF(), alphaF());
    else
        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)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setGreenF", green);
    if (cspec != Rgb)
        setRgbF(redF(), green, blueF(), alphaF());
    else
        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)
{
    QCOLOR_REAL_RANGE_CHECK("QColor::setBlueF", blue);
    if (cspec != Rgb)
        setRgbF(redF(), greenF(), blue, alphaF());
    else
        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);