/****************************************************************************

**

** Copyright (C) 2010 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 "qpicture.h"

#include <private/qpicture_p.h>

#ifndef QT_NO_PICTURE

#include <private/qfactoryloader_p.h>

#include <private/qpaintengine_pic_p.h>

#include "qdatastream.h"

#include "qfile.h"

#include "qimage.h"

#include "qmutex.h"

#include "qpainter.h"

#include "qpainterpath.h"

#include "qpixmap.h"

#include "qregion.h"

#include "qdebug.h"

QT_BEGIN_NAMESPACE

void qt_format_text(const QFont &fnt, const QRectF &_r,

                    int tf, const QTextOption *opt, const QString& str, QRectF *brect,

                    int tabstops, int *, int tabarraylen,

                    QPainter *painter);

/*!

    \class QPicture

    \brief The QPicture class is a paint device that records and

    replays QPainter commands.

    \ingroup painting

    \ingroup shared

    A picture serializes painter commands to an IO device in a

    platform-independent format. They are sometimes referred to as meta-files.

    Qt pictures use a proprietary binary format. Unlike native picture

    (meta-file) formats on many window systems, Qt pictures have no

    limitations regarding their contents. Everything that can be

    painted on a widget or pixmap (e.g., fonts, pixmaps, regions,

    transformed graphics, etc.)  can also be stored in a picture.

    QPicture is resolution independent, i.e. a QPicture can be

    displayed on different devices (for example svg, pdf, ps, printer

    and screen) looking the same. This is, for instance, needed for

    WYSIWYG print preview. QPicture runs in the default system dpi,

    and scales the painter to match differences in resolution

    depending on the window system.

    Example of how to record a picture:

    \snippet doc/src/snippets/picture/picture.cpp 0

    Note that the list of painter commands is reset on each call to

    the QPainter::begin() function.

    Example of how to replay a picture:

    \snippet doc/src/snippets/picture/picture.cpp 1

    Pictures can also be drawn using play(). Some basic data about a

    picture is available, for example, size(), isNull() and

    boundingRect().

    \sa QMovie

*/

const char  *qt_mfhdr_tag = "QPIC"; // header tag

static const quint16 mfhdr_maj = 11; // major version #

static const quint16 mfhdr_min = 0; // minor version #

Q_GUI_EXPORT extern int qt_defaultDpiX();

Q_GUI_EXPORT extern int qt_defaultDpiY();

/*!

    Constructs an empty picture.

    The \a formatVersion parameter may be used to \e create a QPicture

    that can be read by applications that are compiled with earlier

    versions of Qt.

    Note that the default formatVersion is -1 which signifies the

    current release, i.e. for Qt 4.0 a formatVersion of 7 is the same

    as the default formatVersion of -1.

    Reading pictures generated by earlier versions of Qt is not

    supported in Qt 4.0.

*/

QPicture::QPicture(int formatVersion)

    : QPaintDevice(),

      d_ptr(new QPicturePrivate)

{

    Q_D(QPicture);

    if (formatVersion == 0)

        qWarning("QPicture: invalid format version 0");

    // still accept the 0 default from before Qt 3.0.

    if (formatVersion > 0 && formatVersion != (int)mfhdr_maj) {

        d->formatMajor = formatVersion;

        d->formatMinor = 0;

        d->formatOk = false;

    } else {

        d->resetFormat();

    }

}

/*!

    Constructs a copy of \a pic.

    This constructor is fast thanks to \l{implicit sharing}.

*/

QPicture::QPicture(const QPicture &pic)

    : QPaintDevice(), d_ptr(pic.d_ptr)

{

}

/*! \internal */

QPicture::QPicture(QPicturePrivate &dptr)

    : QPaintDevice(),

      d_ptr(&dptr)

{

}

/*!

    Destroys the picture.

*/

QPicture::~QPicture()

{

}

/*!

  \internal

*/

int QPicture::devType() const

{

    return QInternal::Picture;

}

/*!

    \fn bool QPicture::isNull() const

    Returns true if the picture contains no data; otherwise returns

    false.

*/

/*!

    \fn uint QPicture::size() const

    Returns the size of the picture data.

    \sa data()

*/

/*!

    \fn const char* QPicture::data() const

    Returns a pointer to the picture data. The pointer is only valid

    until the next non-const function is called on this picture. The

    returned pointer is 0 if the picture contains no data.

    \sa size(), isNull()

*/

bool QPicture::isNull() const

{

    return d_func()->pictb.buffer().isNull();

}

uint QPicture::size() const

{

    return d_func()->pictb.buffer().size();

}

const char* QPicture::data() const

{

    return d_func()->pictb.buffer();

}

void QPicture::detach()

{

    d_ptr.detach();

}

bool QPicture::isDetached() const

{

    return d_func()->ref == 1;

}

/*!

    Sets the picture data directly from \a data and \a size. This

    function copies the input data.

    \sa data(), size()

*/

void QPicture::setData(const char* data, uint size)

{

    detach();

    d_func()->pictb.setData(data, size);

    d_func()->resetFormat();                                // we'll have to check

}

/*!

    Loads a picture from the file specified by \a fileName and returns

    true if successful; otherwise returns false.

    Please note that the \a format parameter has been deprecated and

    will have no effect.

    \sa save()

*/

bool QPicture::load(const QString &fileName, const char *format)

{

    QFile f(fileName);

    if (!f.open(QIODevice::ReadOnly))

        return false;

    return load(&f, format);

}

/*!

    \overload

    \a dev is the device to use for loading.

*/

bool QPicture::load(QIODevice *dev, const char *format)

{

    if(format) {

#ifndef QT_NO_PICTUREIO

        QPictureIO io(dev, format);

        bool result = io.read();

        if (result) {

            operator=(io.picture());

        } else if (format)

#else

            bool result = false;

#endif

        {

            qWarning("QPicture::load: No such picture format: %s", format);

        }

        return result;

    }

    detach();

    QByteArray a = dev->readAll();

    d_func()->pictb.setData(a);                        // set byte array in buffer

    return d_func()->checkFormat();

}

/*!

    Saves a picture to the file specified by \a fileName and returns

    true if successful; otherwise returns false.

    Please note that the \a format parameter has been deprecated and

    will have no effect.

    \sa load()

*/

bool QPicture::save(const QString &fileName, const char *format)

{

    if (paintingActive()) {

        qWarning("QPicture::save: still being painted on. "

                  "Call QPainter::end() first");

        return false;

    }

    if(format) {

#ifndef QT_NO_PICTUREIO

        QPictureIO io(fileName, format);

        bool result = io.write();

        if (result) {

            operator=(io.picture());

        } else if (format)

#else

        bool result = false;

#endif

        {

            qWarning("QPicture::save: No such picture format: %s", format);

        }

        return result;

    }

    QFile f(fileName);

    if (!f.open(QIODevice::WriteOnly))

        return false;

    return save(&f, format);

}

/*!

    \overload

    \a dev is the device to use for saving.

*/

bool QPicture::save(QIODevice *dev, const char *format)

{

    if (paintingActive()) {

        qWarning("QPicture::save: still being painted on. "

                  "Call QPainter::end() first");

        return false;

    }

    if(format) {

#ifndef QT_NO_PICTUREIO

        QPictureIO io(dev, format);

        bool result = io.write();

        if (result) {

            operator=(io.picture());

        } else if (format)

#else

        bool result = false;

#endif

        {

            qWarning("QPicture::save: No such picture format: %s", format);

        }

        return result;

    }

    dev->write(d_func()->pictb.buffer(), d_func()->pictb.buffer().size());

    return true;

}

/*!

    Returns the picture's bounding rectangle or an invalid rectangle

    if the picture contains no data.

*/

QRect QPicture::boundingRect() const

{

    Q_D(const QPicture);

    // Use override rect where possible.

    if (!d->override_rect.isEmpty())

        return d->override_rect;

    if (!d->formatOk)

        d_ptr->checkFormat();

    return d->brect;

}

/*!

    Sets the picture's bounding rectangle to \a r. The automatically

    calculated value is overridden.

*/

void QPicture::setBoundingRect(const QRect &r)

{

    d_func()->override_rect = r;

}

/*!

    Replays the picture using \a painter, and returns true if

    successful; otherwise returns false.

    This function does exactly the same as QPainter::drawPicture()

    with (x, y) = (0, 0).

*/

bool QPicture::play(QPainter *painter)

{

    Q_D(QPicture);

    if (d->pictb.size() == 0)                        // nothing recorded

        return true;

    if (!d->formatOk && !d->checkFormat())

        return false;

    d->pictb.open(QIODevice::ReadOnly);                // open buffer device

    QDataStream s;

    s.setDevice(&d->pictb);                        // attach data stream to buffer

    s.device()->seek(10);                        // go directly to the data

    s.setVersion(d->formatMajor == 4 ? 3 : d->formatMajor);

    quint8  c, clen;

    quint32 nrecords;

    s >> c >> clen;

    Q_ASSERT(c == QPicturePrivate::PdcBegin);

    // bounding rect was introduced in ver 4. Read in checkFormat().

    if (d->formatMajor >= 4) {

        qint32 dummy;

        s >> dummy >> dummy >> dummy >> dummy;

    }

    s >> nrecords;

    if (!exec(painter, s, nrecords)) {

        qWarning("QPicture::play: Format error");

        d->pictb.close();

        return false;

    }

    d->pictb.close();

    return true;                                // no end-command

}

/*!

  \internal

  Iterates over the internal picture data and draws the picture using

  \a painter.

*/

bool QPicture::exec(QPainter *painter, QDataStream &s, int nrecords)

{

    Q_D(QPicture);

#if defined(QT_DEBUG)

    int                strm_pos;

#endif

    quint8     c;                      // command id

    quint8     tiny_len;               // 8-bit length descriptor

    qint32     len;                    // 32-bit length descriptor

    qint16     i_16, i1_16, i2_16;     // parameters...

    qint8      i_8;

    quint32    ul;

    double     dbl;

    bool       bl;

    QByteArray  str1;

    QString     str;

    QPointF     p, p1, p2;

    QPoint      ip, ip1, ip2;

    QRect       ir;

    QRectF      r;

    QPolygonF   a;

    QPolygon    ia;

    QColor      color;

    QFont       font;

    QPen        pen;

    QBrush      brush;

    QRegion     rgn;

    QMatrix     wmatrix;

    QTransform  matrix;

    QTransform worldMatrix = painter->transform();

    worldMatrix.scale(qreal(painter->device()->logicalDpiX()) / qreal(qt_defaultDpiX()),

                      qreal(painter->device()->logicalDpiY()) / qreal(qt_defaultDpiY()));

    painter->setTransform(worldMatrix);

    while (nrecords-- && !s.atEnd()) {

        s >> c;                 // read cmd

        s >> tiny_len;          // read param length

        if (tiny_len == 255)    // longer than 254 bytes

            s >> len;

        else

            len = tiny_len;

#if defined(QT_DEBUG)

        strm_pos = s.device()->pos();

#endif

        switch (c) {            // exec cmd

        case QPicturePrivate::PdcNOP:

            break;

        case QPicturePrivate::PdcDrawPoint:

            if (d->formatMajor <= 5) {

                s >> ip;

                painter->drawPoint(ip);

            } else {

                s >> p;

                painter->drawPoint(p);

            }

            break;

        case QPicturePrivate::PdcDrawPoints:

// ## implement me in the picture paint engine

//                 s >> a >> i1_32 >> i2_32;

//                 painter->drawPoints(a.mid(i1_32, i2_32));

            break;

        case QPicturePrivate::PdcDrawPath: {

            QPainterPath path;

            s >> path;

            painter->drawPath(path);

            break;

        }

        case QPicturePrivate::PdcDrawLine:

            if (d->formatMajor <= 5) {

                s >> ip1 >> ip2;

                painter->drawLine(ip1, ip2);

            } else {

                s >> p1 >> p2;

                painter->drawLine(p1, p2);

            }

            break;

        case QPicturePrivate::PdcDrawRect:

            if (d->formatMajor <= 5) {

                s >> ir;