source: trunk/src/gui/image/qmovie.cpp@ 439

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

/*! 
    \class QMovie

    \brief The QMovie class is a convenience class for playing movies
    with QImageReader.

    \ingroup multimedia

    First, create a QMovie object by passing either the name of a file or a
    pointer to a QIODevice containing an animated image format to QMovie's
    constructor. You can call isValid() to check if the image data is valid,
    before starting the movie. To start the movie, call start(). QMovie will
    enter \l Running state, and emit started() and stateChanged(). To get the
    current state of the movie, call state().

    To display the movie in your application, you can pass your QMovie object
    to QLabel::setMovie(). Example:

    \snippet doc/src/snippets/code/src_gui_image_qmovie.cpp 0

    Whenever a new frame is available in the movie, QMovie will emit
    updated(). If the size of the frame changes, resized() is emitted. You can
    call currentImage() or currentPixmap() to get a copy of the current
    frame. When the movie is done, QMovie emits finished(). If any error
    occurs during playback (i.e, the image file is corrupt), QMovie will emit
    error().

    You can control the speed of the movie playback by calling setSpeed(),
    which takes the percentage of the original speed as an argument. Pause the
    movie by calling setPaused(true). QMovie will then enter \l Paused state
    and emit stateChanged(). If you call setPaused(false), QMovie will reenter
    \l Running state and start the movie again. To stop the movie, call
    stop().

    Certain animation formats allow you to set the background color. You can
    call setBackgroundColor() to set the color, or backgroundColor() to
    retrieve the current background color.

    currentFrameNumber() returns the sequence number of the current frame. The
    first frame in the animation has the sequence number 0. frameCount()
    returns the total number of frames in the animation, if the image format
    supports this. You can call loopCount() to get the number of times the
    movie should loop before finishing. nextFrameDelay() returns the number of
    milliseconds the current frame should be displayed.

    QMovie can be instructed to cache frames of an animation by calling
    setCacheMode().

    Call supportedFormats() for a list of formats that QMovie supports.

    \sa QLabel, QImageReader, {Movie Example}
*/

/*! \enum QMovie::MovieState

    This enum describes the different states of QMovie.

    \value NotRunning The movie is not running. This is QMovie's initial
    state, and the state it enters after stop() has been called or the movie
    is finished.

    \value Paused The movie is paused, and QMovie stops emitting updated() or
    resized(). This state is entered after calling pause() or
    setPaused(true). The current frame number it kept, and the movie will
    continue with the next frame when unpause() or setPaused(false) is called.

    \value Running The movie is running.
*/

/*! \enum QMovie::CacheMode

    This enum describes the different cache modes of QMovie.

    \value CacheNone No frames are cached (the default).

    \value CacheAll All frames are cached.
*/

/*! \fn void QMovie::started()

    This signal is emitted after QMovie::start() has been called, and QMovie
    has entered QMovie::Running state.
*/

/*! \fn void QMovie::resized(const QSize &size)

    This signal is emitted when the current frame has been resized to \a
    size. This effect is sometimes used in animations as an alternative to
    replacing the frame. You can call currentImage() or currentPixmap() to get a
    copy of the updated frame.
*/

/*! \fn void QMovie::updated(const QRect &rect)

    This signal is emitted when the rect \a rect in the current frame has been
    updated. You can call currentImage() or currentPixmap() to get a copy of the
    updated frame.
*/

/*! \fn void QMovie::frameChanged(int frameNumber)
    \since 4.1

    This signal is emitted when the frame number has changed to
    \a frameNumber.  You can call currentImage() or currentPixmap() to get a
    copy of the frame.
*/

/*! 
    \fn void QMovie::stateChanged(QMovie::MovieState state)

    This signal is emitted every time the state of the movie changes. The new
    state is specified by \a state.

    \sa QMovie::state()
*/

/*! \fn void QMovie::error(QImageReader::ImageReaderError error)

    This signal is emitted by QMovie when the error \a error occurred during
    playback.  QMovie will stop the movie, and enter QMovie::NotRunning state.
*/

/*! \fn void QMovie::finished()

    This signal is emitted when the movie has finished.

    \sa QMovie::stop()
*/

#include "qglobal.h"

#ifndef QT_NO_MOVIE

#include "qmovie.h"
#include "qimage.h"
#include "qimagereader.h"
#include "qpixmap.h"
#include "qrect.h"
#include "qdatetime.h"
#include "qtimer.h"
#include "qpair.h"
#include "qmap.h"
#include "qlist.h"
#include "qbuffer.h"
#include "qdir.h"
#include "private/qobject_p.h"

#define QMOVIE_INVALID_DELAY -1

QT_BEGIN_NAMESPACE

class QFrameInfo
{
public:
    QPixmap pixmap;
    int delay;
    bool endMark;
    inline QFrameInfo(bool endMark)
        : pixmap(QPixmap()), delay(QMOVIE_INVALID_DELAY), endMark(endMark)
    { }
    
    inline QFrameInfo()
        : pixmap(QPixmap()), delay(QMOVIE_INVALID_DELAY), endMark(false)
    { }
    
    inline QFrameInfo(const QPixmap &pixmap, int delay)
        : pixmap(pixmap), delay(delay), endMark(false)
    { }
    
    inline bool isValid()
    {
        return endMark || !(pixmap.isNull() && (delay == QMOVIE_INVALID_DELAY));
    }
    
    inline bool isEndMarker()
    { return endMark; }
    
    static inline QFrameInfo endMarker()
    { return QFrameInfo(true); }
};

class QMoviePrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QMovie)

public:
    QMoviePrivate(QMovie *qq);
    bool isDone();
    bool next();
    int speedAdjustedDelay(int delay) const;
    bool isValid() const;
    bool jumpToFrame(int frameNumber);
    int frameCount() const;
    bool jumpToNextFrame();
    QFrameInfo infoForFrame(int frameNumber);
    void reset();

    inline void enterState(QMovie::MovieState newState) {
        movieState = newState;
        emit q_func()->stateChanged(newState);
    }

    // private slots
    void _q_loadNextFrame();
    void _q_loadNextFrame(bool starting);

    QImageReader *reader;
    int speed;
    QMovie::MovieState movieState;
    QRect frameRect;
    QPixmap currentPixmap;
    int currentFrameNumber;
    int nextFrameNumber;
    int greatestFrameNumber;
    int nextDelay;
    int playCounter;
    qint64 initialDevicePos;
    QMovie::CacheMode cacheMode;
    bool haveReadAll;
    bool isFirstIteration;
    QMap<int, QFrameInfo> frameMap;
    QString absoluteFilePath;

    QTimer nextImageTimer;
};

/*! \internal
 */
QMoviePrivate::QMoviePrivate(QMovie *qq)
    : reader(0), speed(100), movieState(QMovie::NotRunning),
      currentFrameNumber(-1), nextFrameNumber(0), greatestFrameNumber(-1),
      nextDelay(0), playCounter(-1),
      cacheMode(QMovie::CacheNone), haveReadAll(false), isFirstIteration(true)
{
    q_ptr = qq;
    nextImageTimer.setSingleShot(true);
}

/*! \internal