kde-extraapps/gwenview/lib/document/animateddocumentloadedimpl.cpp

// vim: set tabstop=4 shiftwidth=4 expandtab:
/*
Gwenview: an image viewer
Copyright 2008 Aurélien Gâteau <agateau@kde.org>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.

*/
// Self
#include "moc_animateddocumentloadedimpl.cpp"

// Qt
#include <QBuffer>
#include <QImage>
#include <QMovie>

// KDE
#include <KDebug>

// Local

namespace Gwenview
{

struct AnimatedDocumentLoadedImplPrivate
{
    QByteArray mRawData;
    QBuffer mMovieBuffer;
    QMovie mMovie;
};

AnimatedDocumentLoadedImpl::AnimatedDocumentLoadedImpl(Document* document, const QByteArray& rawData)
: AbstractDocumentImpl(document)
, d(new AnimatedDocumentLoadedImplPrivate)
{
    d->mRawData = rawData;

    connect(&d->mMovie, SIGNAL(frameChanged(int)), SLOT(slotFrameChanged(int)));

    d->mMovieBuffer.setBuffer(&d->mRawData);
    d->mMovieBuffer.open(QIODevice::ReadOnly);
    d->mMovie.setDevice(&d->mMovieBuffer);
}

AnimatedDocumentLoadedImpl::~AnimatedDocumentLoadedImpl()
{
    delete d;
}

void AnimatedDocumentLoadedImpl::init()
{
    emit isAnimatedUpdated();
    if (!document()->image().isNull()) {
        // We may reach this point without an image if the first frame got
        // downsampled by LoadingDocumentImpl (unlikely for now because the gif
        // io handler does not support the QImageIOHandler::ScaledSize option)
        emit imageRectUpdated(document()->image().rect());
        emit loaded();
    }
}

Document::LoadingState AnimatedDocumentLoadedImpl::loadingState() const
{
    return Document::Loaded;
}

QByteArray AnimatedDocumentLoadedImpl::rawData() const
{
    return d->mRawData;
}

void AnimatedDocumentLoadedImpl::slotFrameChanged(int /*frameNumber*/)
{
    QImage image = d->mMovie.currentImage();
    setDocumentImage(image);
    emit imageRectUpdated(image.rect());
}

bool AnimatedDocumentLoadedImpl::isAnimated() const
{
    return true;
}

void AnimatedDocumentLoadedImpl::startAnimation()
{
    d->mMovie.start();
    if (d->mMovie.state() == QMovie::NotRunning) {
        // This is true with qt-copy as of 2008.08.23
        kDebug() << "QMovie didn't start. This can happen in some cases when starting for the second time.";
        kDebug() << "Trying to start again, it usually fixes the bug.";
        d->mMovie.start();
    }
}

void AnimatedDocumentLoadedImpl::stopAnimation()
{
    d->mMovie.stop();
}

} // namespace