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Branched from the monolithic repo, Qt master branch, at commit
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diff --git a/src/gui/painting/qpen.cpp b/src/gui/painting/qpen.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qpen.h"
+#include "qpen_p.h"
+#include "qdatastream.h"
+#include "qvariant.h"
+#include "qbrush.h"
+
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+typedef QPenPrivate QPenData;
+
+/*!
+    \class QPen
+    \ingroup painting
+    \ingroup shared
+
+
+    \brief The QPen class defines how a QPainter should draw lines and outlines
+    of shapes.
+
+    A pen has a style(), width(), brush(), capStyle() and joinStyle().
+
+    The pen style defines the line type. The brush is used to fill
+    strokes generated with the pen. Use the QBrush class to specify
+    fill styles.  The cap style determines the line end caps that can
+    be drawn using QPainter, while the join style describes how joins
+    between two lines are drawn. The pen width can be specified in
+    both integer (width()) and floating point (widthF()) precision. A
+    line width of zero indicates a cosmetic pen.  This means that the
+    pen width is always drawn one pixel wide, independent of the \l
+    {QPainter#Coordinate Transformations}{transformation} set on the
+    painter.
+
+    The various settings can easily be modified using the
+    corresponding setStyle(), setWidth(), setBrush(), setCapStyle()
+    and setJoinStyle() functions (note that the painter's pen must be
+    reset when altering the pen's properties).
+
+    For example:
+
+    \snippet doc/src/snippets/code/src_gui_painting_qpen.cpp 0
+
+    which is equivalent to
+
+    \snippet doc/src/snippets/code/src_gui_painting_qpen.cpp 1
+
+    The default pen is a solid black brush with 0 width, square
+    cap style (Qt::SquareCap), and  bevel join style (Qt::BevelJoin).
+
+    In addition QPen provides the color() and setColor()
+    convenience functions to extract and set the color of the pen's
+    brush, respectively. Pens may also be compared and streamed.
+
+    For more information about painting in general, see the \l{Paint
+    System} documentation.
+
+    \tableofcontents
+
+    \section1 Pen Style
+
+    Qt provides several built-in styles represented by the
+    Qt::PenStyle enum:
+
+    \table
+    \row
+    \o \inlineimage qpen-solid.png
+    \o \inlineimage qpen-dash.png
+    \o \inlineimage qpen-dot.png
+    \row
+    \o Qt::SolidLine
+    \o Qt::DashLine
+    \o Qt::DotLine
+    \row
+    \o \inlineimage qpen-dashdot.png
+    \o \inlineimage qpen-dashdotdot.png
+    \o \inlineimage qpen-custom.png
+    \row
+    \o Qt::DashDotLine
+    \o Qt::DashDotDotLine
+    \o Qt::CustomDashLine
+    \endtable
+
+    Simply use the setStyle() function to convert the pen style to
+    either of the built-in styles, except the Qt::CustomDashLine style
+    which we will come back to shortly. Setting the style to Qt::NoPen
+    tells the painter to not draw lines or outlines. The default pen
+    style is Qt::SolidLine.
+
+    Since Qt 4.1 it is also possible to specify a custom dash pattern
+    using the setDashPattern() function which implicitly converts the
+    style of the pen to Qt::CustomDashLine. The pattern argument, a
+    QVector, must be specified as an even number of \l qreal entries
+    where the entries 1, 3, 5... are the dashes and 2, 4, 6... are the
+    spaces. For example, the custom pattern shown above is created
+    using the following code:
+
+    \snippet doc/src/snippets/code/src_gui_painting_qpen.cpp 2
+
+    Note that the dash pattern is specified in units of the pens
+    width, e.g. a dash of length 5 in width 10 is 50 pixels long.
+
+    The currently set dash pattern can be retrieved using the
+    dashPattern() function. Use the isSolid() function to determine
+    whether the pen has a solid fill, or not.
+
+    \section1 Cap Style
+
+    The cap style defines how the end points of lines are drawn using
+    QPainter.  The cap style only apply to wide lines, i.e. when the
+    width is 1 or greater. The Qt::PenCapStyle enum provides the
+    following styles:
+
+    \table
+    \row
+    \o \inlineimage qpen-square.png
+    \o \inlineimage qpen-flat.png
+    \o \inlineimage qpen-roundcap.png
+    \row
+    \o Qt::SquareCap
+    \o Qt::FlatCap
+    \o Qt::RoundCap
+    \endtable
+
+    The Qt::SquareCap style is a square line end that covers the end
+    point and extends beyond it by half the line width. The
+    Qt::FlatCap style is a square line end that does not cover the end
+    point of the line. And the Qt::RoundCap style is a rounded line
+    end covering the end point.
+
+    The default is Qt::SquareCap.
+
+    Whether or not end points are drawn when the pen width is 0 or 1
+    depends on the cap style. Using Qt::SquareCap or Qt::RoundCap they
+    are drawn, using Qt::FlatCap they are not drawn.
+
+    \section1 Join Style
+
+    The join style defines how joins between two connected lines can
+    be drawn using QPainter. The join style only apply to wide lines,
+    i.e. when the width is 1 or greater. The Qt::PenJoinStyle enum
+    provides the following styles:
+
+    \table
+    \row
+    \o \inlineimage qpen-bevel.png
+    \o \inlineimage qpen-miter.png
+    \o \inlineimage qpen-roundjoin.png
+    \row
+    \o Qt::BevelJoin
+    \o Qt::MiterJoin
+    \o Qt::RoundJoin
+    \endtable
+
+    The Qt::BevelJoin style fills the triangular notch between the two
+    lines. The Qt::MiterJoin style extends the lines to meet at an
+    angle. And the Qt::RoundJoin style fills a circular arc between
+    the two lines.
+
+    The default is Qt::BevelJoin.
+
+    \image qpen-miterlimit.png
+
+    When the Qt::MiterJoin style is applied, it is possible to use the
+    setMiterLimit() function to specify how far the miter join can
+    extend from the join point. The miterLimit() is used to reduce
+    artifacts between line joins where the lines are close to
+    parallel.
+
+    The miterLimit() must be specified in units of the pens width,
+    e.g. a miter limit of 5 in width 10 is 50 pixels long. The
+    default miter limit is 2, i.e. twice the pen width in pixels.
+
+    \table 100%
+    \row
+    \o \inlineimage qpen-demo.png
+    \o \bold {\l {demos/pathstroke}{The Path Stroking Demo}}
+
+    The Path Stroking demo shows Qt's built-in dash patterns and shows
+    how custom patterns can be used to extend the range of available
+    patterns.
+    \endtable
+
+    \sa QPainter, QBrush, {demos/pathstroke}{Path Stroking Demo},
+        {Scribble Example}
+*/
+
+/*!
+  \internal
+*/
+inline QPenPrivate::QPenPrivate(const QBrush &_brush, qreal _width, Qt::PenStyle penStyle,
+                                Qt::PenCapStyle _capStyle, Qt::PenJoinStyle _joinStyle)
+    : dashOffset(0), miterLimit(2),
+      cosmetic(false)
+{
+    ref = 1;
+    width = _width;
+    brush = _brush;
+    style = penStyle;
+    capStyle = _capStyle;
+    joinStyle = _joinStyle;
+}
+
+static const Qt::PenCapStyle qpen_default_cap = Qt::SquareCap;
+static const Qt::PenJoinStyle qpen_default_join = Qt::BevelJoin;
+
+#ifndef QT_NO_THREAD
+// Special deleter that only deletes if the ref-count goes to zero
+template <>
+class QGlobalStaticDeleter<QPenPrivate>
+{
+public:
+    QGlobalStatic<QPenPrivate> &globalStatic;
+    QGlobalStaticDeleter(QGlobalStatic<QPenPrivate> &_globalStatic)
+        : globalStatic(_globalStatic)
+    { }
+
+    inline ~QGlobalStaticDeleter()
+    {
+        if (!globalStatic.pointer->ref.deref())
+            delete globalStatic.pointer;
+        globalStatic.pointer = 0;
+        globalStatic.destroyed = true;
+    }
+};
+#endif
+
+Q_GLOBAL_STATIC_WITH_ARGS(QPenData, defaultPenInstance,
+                          (Qt::black, 0, Qt::SolidLine, qpen_default_cap, qpen_default_join))
+Q_GLOBAL_STATIC_WITH_ARGS(QPenData, nullPenInstance,
+                          (Qt::black, 0, Qt::NoPen, qpen_default_cap, qpen_default_join))
+
+/*!
+    Constructs a default black solid line pen with 0 width.
+*/
+
+QPen::QPen()
+{
+    d = defaultPenInstance();
+    d->ref.ref();
+}
+
+/*!
+    Constructs a black pen with 0 width and the given \a style.
+
+    \sa setStyle()
+*/
+
+QPen::QPen(Qt::PenStyle style)
+{
+    if (style == Qt::NoPen) {
+        d = nullPenInstance();
+        d->ref.ref();
+    } else {
+        d = new QPenData(Qt::black, 0, style, qpen_default_cap, qpen_default_join);
+    }
+}
+
+
+/*!
+    Constructs a solid line pen with 0 width and the given \a color.
+
+    \sa setBrush(), setColor()
+*/
+
+QPen::QPen(const QColor &color)
+{
+    d = new QPenData(color, 0, Qt::SolidLine, qpen_default_cap, qpen_default_join);
+}
+
+
+/*!
+    \fn QPen::QPen(const QBrush &brush, qreal width, Qt::PenStyle style, Qt::PenCapStyle cap, Qt::PenJoinStyle join)
+
+    Constructs a pen with the specified \a brush, \a width, pen \a style,
+    \a cap style and \a join style.
+
+    \sa setBrush(), setWidth(), setStyle(),  setCapStyle(), setJoinStyle()
+*/
+
+QPen::QPen(const QBrush &brush, qreal width, Qt::PenStyle s, Qt::PenCapStyle c, Qt::PenJoinStyle j)
+{
+    d = new QPenData(brush, width, s, c, j);
+}
+
+/*!
+    \fn QPen::QPen(const QPen &pen)
+
+    Constructs a pen that is a copy of the given \a pen.
+*/
+
+QPen::QPen(const QPen &p)
+{
+    d = p.d;
+    d->ref.ref();
+}
+
+
+/*!
+    Destroys the pen.
+*/
+
+QPen::~QPen()
+{
+    if (!d->ref.deref())
+        delete d;
+}
+
+/*!
+    \fn void QPen::detach()
+    Detaches from shared pen data to make sure that this pen is the
+    only one referring the data.
+
+    If multiple pens share common data, this pen dereferences the data
+    and gets a copy of the data. Nothing is done if there is just a
+    single reference.
+*/
+
+void QPen::detach()
+{
+    if (d->ref == 1)
+        return;
+
+    QPenData *x = new QPenData(*static_cast<QPenData *>(d));
+    if (!d->ref.deref())
+        delete d;
+    x->ref = 1;
+    d = x;
+}
+
+
+/*!
+    \fn QPen &QPen::operator=(const QPen &pen)
+
+    Assigns the given \a pen to this pen and returns a reference to
+    this pen.
+*/
+
+QPen &QPen::operator=(const QPen &p)
+{
+    qAtomicAssign(d, p.d);
+    return *this;
+}
+
+/*!
+    \fn void QPen::swap(QPen &other)
+    \since 4.8
+
+    Swaps pen \a other with this pen. This operation is very
+    fast and never fails.
+*/
+
+/*!
+   Returns the pen as a QVariant.
+*/
+QPen::operator QVariant() const
+{
+    return QVariant(QVariant::Pen, this);
+}
+
+/*!
+    \fn Qt::PenStyle QPen::style() const
+
+    Returns the pen style.
+
+    \sa setStyle(), {QPen#Pen Style}{Pen Style}
+*/
+Qt::PenStyle QPen::style() const
+{
+    return d->style;
+}
+/*!
+    \fn void QPen::setStyle(Qt::PenStyle style)
+
+    Sets the pen style to the given \a style.
+
+    See the \l Qt::PenStyle documentation for a list of the available
+    styles. Since Qt 4.1 it is also possible to specify a custom dash
+    pattern using the setDashPattern() function which implicitly
+    converts the style of the pen to Qt::CustomDashLine.
+
+    \note This function resets the dash offset to zero.
+
+    \sa style(), {QPen#Pen Style}{Pen Style}
+*/
+
+void QPen::setStyle(Qt::PenStyle s)
+{
+    if (d->style == s)
+        return;
+    detach();
+    d->style = s;
+    QPenData *dd = static_cast<QPenData *>(d);
+    dd->dashPattern.clear();
+    dd->dashOffset = 0;
+}
+
+/*!
+    Returns the dash pattern of this pen.
+
+    \sa style(), isSolid()
+ */
+QVector<qreal> QPen::dashPattern() const
+{
+    QPenData *dd = static_cast<QPenData *>(d);
+    if (d->style == Qt::SolidLine || d->style == Qt::NoPen) {
+        return QVector<qreal>();
+    } else if (dd->dashPattern.isEmpty()) {
+        const qreal space = 2;
+        const qreal dot = 1;
+        const qreal dash = 4;
+
+        switch (d->style) {
+        case Qt::DashLine:
+            dd->dashPattern << dash << space;
+            break;
+        case Qt::DotLine:
+            dd->dashPattern << dot << space;
+            break;
+        case Qt::DashDotLine:
+            dd->dashPattern << dash << space << dot << space;
+            break;
+        case Qt::DashDotDotLine:
+            dd->dashPattern << dash << space << dot << space << dot << space;
+            break;
+        default:
+            break;
+        }
+    }
+    return dd->dashPattern;
+}
+
+/*!
+    Sets the dash pattern for this pen to the given \a pattern. This
+    implicitly converts the style of the pen to Qt::CustomDashLine.
+
+    The pattern must be specified as an even number of positive entries
+    where the entries 1, 3, 5... are the dashes and 2, 4, 6... are the
+    spaces. For example:
+
+    \table 100%
+    \row
+    \o \inlineimage qpen-custom.png
+    \o
+    \snippet doc/src/snippets/code/src_gui_painting_qpen.cpp 3
+    \endtable
+
+    The dash pattern is specified in units of the pens width; e.g. a
+    dash of length 5 in width 10 is 50 pixels long. Note that a pen
+    with zero width is equivalent to a cosmetic pen with a width of 1
+    pixel.
+
+    Each dash is also subject to cap styles so a dash of 1 with square
+    cap set will extend 0.5 pixels out in each direction resulting in
+    a total width of 2.
+
+    Note that the default cap style is Qt::SquareCap, meaning that a
+    square line end covers the end point and extends beyond it by half
+    the line width.
+
+    \sa setStyle(), dashPattern(), setCapStyle(), setCosmetic()
+ */
+void QPen::setDashPattern(const QVector<qreal> &pattern)
+{
+    if (pattern.isEmpty())
+        return;
+    detach();
+
+    QPenData *dd = static_cast<QPenData *>(d);
+    dd->dashPattern = pattern;
+    d->style = Qt::CustomDashLine;
+
+    if ((dd->dashPattern.size() % 2) == 1) {
+        qWarning("QPen::setDashPattern: Pattern not of even length");
+        dd->dashPattern << 1;
+    }
+}
+
+
+/*!
+    Returns the dash offset for the pen.
+
+    \sa setDashOffset()
+*/
+qreal QPen::dashOffset() const
+{
+    QPenData *dd = static_cast<QPenData *>(d);
+    return dd->dashOffset;
+}
+/*!
+    Sets the dash offset (the starting point on the dash pattern) for this pen
+    to the \a offset specified. The offset is measured in terms of the units used
+    to specify the dash pattern.
+
+    \table
+    \row \o \inlineimage qpen-dashpattern.png
+    \o For example, a pattern where each stroke is four units long, followed by a gap
+    of two units, will begin with the stroke when drawn as a line.
+
+    However, if the dash offset is set to 4.0, any line drawn will begin with the gap.
+    Values of the offset up to 4.0 will cause part of the stroke to be drawn first,
+    and values of the offset between 4.0 and 6.0 will cause the line to begin with
+    part of the gap.
+    \endtable
+
+    \note This implicitly converts the style of the pen to Qt::CustomDashLine.
+*/
+void QPen::setDashOffset(qreal offset)
+{
+    if (qFuzzyCompare(offset, static_cast<QPenData *>(d)->dashOffset))
+        return;
+    detach();
+    QPenData *dd = static_cast<QPenData *>(d);
+    dd->dashOffset = offset;
+    if (d->style != Qt::CustomDashLine) {
+        dd->dashPattern = dashPattern();
+        d->style = Qt::CustomDashLine;
+    }
+}
+
+/*!
+    Returns the miter limit of the pen. The miter limit is only
+    relevant when the join style is set to Qt::MiterJoin.
+
+    \sa setMiterLimit(),  {QPen#Join Style}{Join Style}
+*/
+qreal QPen::miterLimit() const
+{
+    const QPenData *dd = static_cast<QPenData *>(d);
+    return dd->miterLimit;
+}
+
+/*!
+    Sets the miter limit of this pen to the given \a limit.
+
+    \image qpen-miterlimit.png
+
+    The miter limit describes how far a miter join can extend from the
+    join point. This is used to reduce artifacts between line joins
+    where the lines are close to parallel.
+
+    This value does only have effect when the pen style is set to
+    Qt::MiterJoin. The value is specified in units of the pen's width,
+    e.g. a miter limit of 5 in width 10 is 50 pixels long. The default
+    miter limit is 2, i.e. twice the pen width in pixels.
+
+    \sa miterLimit(), setJoinStyle(), {QPen#Join Style}{Join Style}
+*/
+void QPen::setMiterLimit(qreal limit)
+{
+    detach();
+    QPenData *dd = static_cast<QPenData *>(d);
+    dd->miterLimit = limit;
+}
+
+
+/*!
+    \fn qreal QPen::width() const
+
+    Returns the pen width with integer precision.
+
+    \sa setWidth(), widthF()
+*/
+
+int QPen::width() const
+{
+    return qRound(d->width);
+}
+
+/*!
+    \fn qreal QPen::widthF() const
+
+    Returns the pen width with floating point precision.
+
+    \sa setWidthF() width()
+*/
+qreal QPen::widthF() const
+{
+    return d->width;
+}
+
+/*!
+    \fn QPen::setWidth(int width)
+
+    Sets the pen width to the given \a width in pixels with integer
+    precision.
+
+    A line width of zero indicates a cosmetic pen. This means that the
+    pen width is always drawn one pixel wide, independent of the \l
+    {QPainter#Coordinate Transformations}{transformation} set on the
+    painter.
+
+    Setting a pen width with a negative value is not supported.
+
+    \sa setWidthF(), width()
+*/
+void QPen::setWidth(int width)
+{
+    if (width < 0)
+        qWarning("QPen::setWidth: Setting a pen width with a negative value is not defined");
+    if ((qreal)width == d->width)
+        return;
+    detach();
+    d->width = width;
+}
+
+/*!
+    Sets the pen width to the given \a width in pixels with floating point
+    precision.
+
+    A line width of zero indicates a cosmetic pen. This means that the
+    pen width is always drawn one pixel wide, independent of the \l
+    {QPainter#Coordinate Transformations}{transformation} on the
+    painter.
+
+    Setting a pen width with a negative value is not supported.
+
+    \sa setWidth() widthF()
+*/
+
+void QPen::setWidthF(qreal width)
+{
+    if (width < 0.f)
+        qWarning("QPen::setWidthF: Setting a pen width with a negative value is not defined");
+    if (qAbs(d->width - width) < 0.00000001f)
+        return;
+    detach();
+    d->width = width;
+}
+
+
+/*!
+    Returns the pen's cap style.
+
+    \sa setCapStyle(), {QPen#Cap Style}{Cap Style}
+*/
+Qt::PenCapStyle QPen::capStyle() const
+{
+    return d->capStyle;
+}
+
+/*!
+    \fn void QPen::setCapStyle(Qt::PenCapStyle style)
+
+    Sets the pen's cap style to the given \a style. The default value
+    is Qt::SquareCap.
+
+    \sa capStyle(), {QPen#Cap Style}{Cap Style}
+*/
+
+void QPen::setCapStyle(Qt::PenCapStyle c)
+{
+    if (d->capStyle == c)
+        return;
+    detach();
+    d->capStyle = c;
+}
+
+/*!
+    Returns the pen's join style.
+
+    \sa setJoinStyle(),  {QPen#Join Style}{Join Style}
+*/
+Qt::PenJoinStyle QPen::joinStyle() const
+{
+    return d->joinStyle;
+}
+
+/*!
+    \fn void QPen::setJoinStyle(Qt::PenJoinStyle style)
+
+    Sets the pen's join style to the given \a style. The default value
+    is Qt::BevelJoin.
+
+    \sa joinStyle(), {QPen#Join Style}{Join Style}
+*/
+
+void QPen::setJoinStyle(Qt::PenJoinStyle j)
+{
+    if (d->joinStyle == j)
+        return;
+    detach();
+    d->joinStyle = j;
+}
+
+/*!
+    \fn const QColor &QPen::color() const
+
+    Returns the color of this pen's brush.
+
+    \sa brush(), setColor()
+*/
+QColor QPen::color() const
+{
+    return d->brush.color();
+}
+
+/*!
+    \fn void QPen::setColor(const QColor &color)
+
+    Sets the color of this pen's brush to the given \a color.
+
+    \sa setBrush(), color()
+*/
+
+void QPen::setColor(const QColor &c)
+{
+    detach();
+    d->brush = QBrush(c);
+}
+
+
+/*!
+    Returns the brush used to fill strokes generated with this pen.
+*/
+QBrush QPen::brush() const
+{
+    return d->brush;
+}
+
+/*!
+    Sets the brush used to fill strokes generated with this pen to the given
+    \a brush.
+
+    \sa brush(), setColor()
+*/
+void QPen::setBrush(const QBrush &brush)
+{
+    detach();
+    d->brush = brush;
+}
+
+
+/*!
+    Returns true if the pen has a solid fill, otherwise false.
+
+    \sa style(), dashPattern()
+*/
+bool QPen::isSolid() const
+{
+    return d->brush.style() == Qt::SolidPattern;
+}
+
+
+/*!
+    Returns true if the pen is cosmetic; otherwise returns false.
+
+    Cosmetic pens are used to draw strokes that have a constant width
+    regardless of any transformations applied to the QPainter they are
+    used with. Drawing a shape with a cosmetic pen ensures that its
+    outline will have the same thickness at different scale factors.
+
+    A zero width pen is cosmetic by default; pens with a non-zero width
+    are non-cosmetic.
+
+    \sa setCosmetic(), widthF()
+*/
+
+bool QPen::isCosmetic() const
+{
+    QPenData *dd = static_cast<QPenData *>(d);
+    return (dd->cosmetic == true) || d->width == 0;
+}
+
+
+/*!
+    Sets this pen to cosmetic or non-cosmetic, depending on the value of
+    \a cosmetic.
+
+    \sa isCosmetic()
+*/
+
+void QPen::setCosmetic(bool cosmetic)
+{
+    detach();
+    QPenData *dd = static_cast<QPenData *>(d);
+    dd->cosmetic = cosmetic;
+}
+
+
+
+/*!
+    \fn bool QPen::operator!=(const QPen &pen) const
+
+    Returns true if the pen is different from the given \a pen;
+    otherwise false. Two pens are different if they have different
+    styles, widths or colors.
+
+    \sa operator==()
+*/
+
+/*!
+    \fn bool QPen::operator==(const QPen &pen) const
+
+    Returns true if the pen is equal to the given \a pen; otherwise
+    false. Two pens are equal if they have equal styles, widths and
+    colors.
+
+    \sa operator!=()
+*/
+
+bool QPen::operator==(const QPen &p) const
+{
+    QPenData *dd = static_cast<QPenData *>(d);
+    QPenData *pdd = static_cast<QPenData *>(p.d);
+    return (p.d == d)
+        || (p.d->style == d->style
+            && p.d->capStyle == d->capStyle
+            && p.d->joinStyle == d->joinStyle
+            && p.d->width == d->width
+            && pdd->miterLimit == dd->miterLimit
+            && (d->style != Qt::CustomDashLine
+                || (qFuzzyCompare(pdd->dashOffset, dd->dashOffset) &&
+                    pdd->dashPattern == dd->dashPattern))
+            && p.d->brush == d->brush
+            && pdd->cosmetic == dd->cosmetic);
+}
+
+
+/*!
+    \fn bool QPen::isDetached()
+
+    \internal
+*/
+
+bool QPen::isDetached()
+{
+    return d->ref == 1;
+}
+
+
+/*****************************************************************************
+  QPen stream functions
+ *****************************************************************************/
+#ifndef QT_NO_DATASTREAM
+/*!
+    \fn QDataStream &operator<<(QDataStream &stream, const QPen &pen)
+    \relates QPen
+
+    Writes the given \a pen to the given \a stream and returns a reference to
+    the \a stream.
+
+    \sa {Serializing Qt Data Types}
+*/
+
+QDataStream &operator<<(QDataStream &s, const QPen &p)
+{
+    QPenData *dd = static_cast<QPenData *>(p.d);
+    if (s.version() < 3) {
+        s << (quint8)p.style();
+    } else if (s.version() < QDataStream::Qt_4_3) {
+        s << (quint8)(p.style() | p.capStyle() | p.joinStyle());
+    } else {
+        s << (quint16)(p.style() | p.capStyle() | p.joinStyle());
+        s << (bool)(dd->cosmetic);
+    }
+
+    if (s.version() < 7) {
+        s << (quint8)p.width();
+        s << p.color();
+    } else {
+        s << double(p.widthF());
+        s << p.brush();
+        s << double(p.miterLimit());
+        if (sizeof(qreal) == sizeof(double)) {
+            s << p.dashPattern();
+        } else {
+            // ensure that we write doubles here instead of streaming the pattern
+            // directly; otherwise, platforms that redefine qreal might generate
+            // data that cannot be read on other platforms.
+            QVector<qreal> pattern = p.dashPattern();
+            s << quint32(pattern.size());
+            for (int i = 0; i < pattern.size(); ++i)
+                s << double(pattern.at(i));
+        }
+        if (s.version() >= 9)
+            s << double(p.dashOffset());
+    }
+    return s;
+}
+
+/*!
+    \fn QDataStream &operator>>(QDataStream &stream, QPen &pen)
+    \relates QPen
+
+    Reads a pen from the given \a stream into the given \a pen and
+    returns a reference to the \a stream.
+
+    \sa {Serializing Qt Data Types}
+*/
+
+QDataStream &operator>>(QDataStream &s, QPen &p)
+{
+    quint16 style;
+    quint8 width8 = 0;
+    double width = 0;
+    QColor color;
+    QBrush brush;
+    double miterLimit = 2;
+    QVector<qreal> dashPattern;
+    double dashOffset = 0;
+    bool cosmetic = false;
+    if (s.version() < QDataStream::Qt_4_3) {
+        quint8 style8;
+        s >> style8;
+        style = style8;
+    } else {
+        s >> style;
+        s >> cosmetic;
+    }
+    if (s.version() < 7) {
+        s >> width8;
+        s >> color;
+        brush = color;
+        width = width8;
+    } else {
+        s >> width;
+        s >> brush;
+        s >> miterLimit;
+        if (sizeof(qreal) == sizeof(double)) {
+            s >> dashPattern;
+        } else {
+            quint32 numDashes;
+            s >> numDashes;
+            double dash;
+            for (quint32 i = 0; i < numDashes; ++i) {
+                s >> dash;
+                dashPattern << dash;
+            }
+        }
+        if (s.version() >= 9)
+            s >> dashOffset;
+    }
+
+    p.detach();
+    QPenData *dd = static_cast<QPenData *>(p.d);
+    dd->width = width;
+    dd->brush = brush;
+    dd->style = Qt::PenStyle(style & Qt::MPenStyle);
+    dd->capStyle = Qt::PenCapStyle(style & Qt::MPenCapStyle);
+    dd->joinStyle = Qt::PenJoinStyle(style & Qt::MPenJoinStyle);
+    dd->dashPattern = dashPattern;
+    dd->miterLimit = miterLimit;
+    dd->dashOffset = dashOffset;
+    dd->cosmetic = cosmetic;
+
+    return s;
+}
+#endif //QT_NO_DATASTREAM
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug dbg, const QPen &p)
+{
+#ifndef Q_BROKEN_DEBUG_STREAM
+    const char *PEN_STYLES[] = {
+        "NoPen",
+        "SolidLine",
+        "DashLine",
+        "DotLine",
+        "DashDotLine",
+        "DashDotDotLine",
+        "CustomDashLine"
+    };
+
+    dbg.nospace() << "QPen(" << p.width() << ',' << p.brush()
+                  << ',' << PEN_STYLES[p.style()] << ',' << int(p.capStyle())
+                  << ',' << int(p.joinStyle()) << ',' << p.dashPattern()
+                  << ',' << p.dashOffset()
+                  << ',' << p.miterLimit() << ')';
+    return dbg.space();
+#else
+    qWarning("This compiler doesn't support streaming QPen to QDebug");
+    return dbg;
+    Q_UNUSED(p);
+#endif
+}
+#endif
+
+/*!
+    \fn DataPtr &QPen::data_ptr()
+    \internal
+*/
+
+/*!
+    \typedef QPen::DataPtr
+
+    \internal
+*/
+
+QT_END_NAMESPACE
+
+#undef QT_COMPILING_QPEN