src/gui/painting/qcolor.h

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/****************************************************************************
**
** 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:
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** 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.
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****************************************************************************/

#ifndef QCOLOR_H
#define QCOLOR_H

#include <QtGui/qrgb.h>
#include <QtCore/qnamespace.h>
#include <QtCore/qstringlist.h>

QT_BEGIN_HEADER

QT_MODULE(Gui)

class QColor;
class QColormap;
class QVariant;

#ifndef QT_NO_DEBUG_STREAM
Q_GUI_EXPORT QDebug operator<<(QDebug, const QColor &);
#endif
#ifndef QT_NO_DATASTREAM
Q_GUI_EXPORT QDataStream &operator<<(QDataStream &, const QColor &);
Q_GUI_EXPORT QDataStream &operator>>(QDataStream &, QColor &);
#endif

class Q_GUI_EXPORT QColor
{
public:
    enum Spec { Invalid, Rgb, Hsv, Cmyk };

    QColor();
    QColor(Qt::GlobalColor color);
    QColor(int r, int g, int b, int a = 255);
    QColor(QRgb rgb);
    QColor(const QString& name);
    QColor(const char *name);
    QColor(const QColor &color);
    QColor(Spec spec);

    bool isValid() const;

    QString name() const;
    void setNamedColor(const QString& name);

    static QStringList colorNames();

    inline Spec spec() const
    { return cspec; }

    int alpha() const;
    void setAlpha(int alpha);

    qreal alphaF() const;
    void setAlphaF(qreal alpha);

    int red() const;
    int green() const;
    int blue() const;
    void setRed(int red);
    void setGreen(int green);
    void setBlue(int blue);

    qreal redF() const;
    qreal greenF() const;
    qreal blueF() const;
    void setRedF(qreal red);
    void setGreenF(qreal green);
    void setBlueF(qreal blue);

    void getRgb(int *r, int *g, int *b, int *a = 0) const;
    void setRgb(int r, int g, int b, int a = 255);

    void getRgbF(qreal *r, qreal *g, qreal *b, qreal *a = 0) const;
    void setRgbF(qreal r, qreal g, qreal b, qreal a = 1.0);

    QRgb rgba() const;
    void setRgba(QRgb rgba);

    QRgb rgb() const;
    void setRgb(QRgb rgb);

    int hue() const; // 0 <= hue < 360
    int saturation() const;
    int value() const;

    qreal hueF() const; // 0.0 <= hueF < 360.0
    qreal saturationF() const;
    qreal valueF() const;

    void getHsv(int *h, int *s, int *v, int *a = 0) const;
    void setHsv(int h, int s, int v, int a = 255);

    void getHsvF(qreal *h, qreal *s, qreal *v, qreal *a = 0) const;
    void setHsvF(qreal h, qreal s, qreal v, qreal a = 1.0);

    int cyan() const;
    int magenta() const;
    int yellow() const;
    int black() const;

    qreal cyanF() const;
    qreal magentaF() const;
    qreal yellowF() const;
    qreal blackF() const;

    void getCmyk(int *c, int *m, int *y, int *k, int *a = 0);
    void setCmyk(int c, int m, int y, int k, int a = 255);

    void getCmykF(qreal *c, qreal *m, qreal *y, qreal *k, qreal *a = 0);
    void setCmykF(qreal c, qreal m, qreal y, qreal k, qreal a = 1.0);

    QColor toRgb() const;
    QColor toHsv() const;
    QColor toCmyk() const;

    QColor convertTo(Spec colorSpec) const;

    static QColor fromRgb(QRgb rgb);
    static QColor fromRgba(QRgb rgba);

    static QColor fromRgb(int r, int g, int b, int a = 255);
    static QColor fromRgbF(qreal r, qreal g, qreal b, qreal a = 1.0);

    static QColor fromHsv(int h, int s, int v, int a = 255);
    static QColor fromHsvF(qreal h, qreal s, qreal v, qreal a = 1.0);

    static QColor fromCmyk(int c, int m, int y, int k, int a = 255);
    static QColor fromCmykF(qreal c, qreal m, qreal y, qreal k, qreal a = 1.0);

    QColor light(int f = 150) const;
    QColor dark(int f = 200) const;

    QColor &operator=(const QColor &);
    QColor &operator=(Qt::GlobalColor color);

    bool operator==(const QColor &c) const;
    bool operator!=(const QColor &c) const;

    operator QVariant() const;

#ifdef QT3_SUPPORT
    inline QT3_SUPPORT_CONSTRUCTOR QColor(int x, int y, int z, Spec colorSpec)
    { if (colorSpec == Hsv) setHsv(x, y, z); else setRgb(x, y, z); }

    inline QT3_SUPPORT void rgb(int *r, int *g, int *b) const
    { getRgb(r, g, b); }
    inline QT3_SUPPORT void hsv(int *h, int *s, int *v) const
    { getHsv(h, s, v); }

    inline QT3_SUPPORT void setRgba(int r, int g, int b, int a)
    { setRgb(r, g, b, a); }
    inline QT3_SUPPORT void getRgba(int *r, int *g, int *b, int *a) const
    { getRgb(r, g, b, a); }

    QT3_SUPPORT uint pixel(int screen = -1) const;
#endif

private:
#ifndef QT3_SUPPORT
    // do not allow a spec to be used as an alpha value
    QColor(int, int, int, Spec);
#endif

    void invalidate();

    Spec cspec;
    union {
        struct {
            ushort alpha;
            ushort red;
            ushort green;
            ushort blue;
            ushort pad;
        } argb;
        struct {
            ushort alpha;
            ushort hue;
            ushort saturation;
            ushort value;
            ushort pad;
        } ahsv;
        struct {
            ushort alpha;
            ushort cyan;
            ushort magenta;
            ushort yellow;
            ushort black;
        } acmyk;
    } ct;

    friend class QColormap;
#ifndef QT_NO_DATASTREAM
    friend Q_GUI_EXPORT QDataStream &operator<<(QDataStream &, const QColor &);
    friend Q_GUI_EXPORT QDataStream &operator>>(QDataStream &, QColor &);
#endif
};

inline QColor::QColor()
{ invalidate(); }

inline QColor::QColor(int r, int g, int b, int a)
{ setRgb(r, g, b, a); }

inline QColor::QColor(const char *aname)
{ setNamedColor(QLatin1String(aname)); }

inline QColor::QColor(const QString& aname)
{ setNamedColor(aname); }

inline QColor::QColor(const QColor &acolor)
    : cspec(acolor.cspec)
{ ct.argb = acolor.ct.argb; }

inline bool QColor::isValid() const
{ return cspec != Invalid; }

QT_END_HEADER

#endif // QCOLOR_H

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