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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "bytereader.h"
#include "thumbnailableimage.h"
#include <QByteArray>
#include <QThread>
#include <QImage>
#include <QImageReader>
#include <QUrl>
#include <QFile>
#include <QCoreApplication>
#include <QPainter>
ByteReader::ByteReader()
: m_stop(0), m_loading(0)
{ }
void ByteReader::loadFile(const ThumbnailableImage &image)
{
if (!m_stop.load())
{
m_loading.ref();
// FIXME: actually handle remote files
QUrl url = image.url();
QString fn = url.toLocalFile();
int pos = fn.lastIndexOf('.');
QString ext;
if (pos != -1)
ext = fn.mid(pos).toUpper();
if (ext.isEmpty() ||
!QImageReader::supportedImageFormats().contains(ext.toLocal8Bit()))
ext = QString();
QImage im;
QFile f(fn);
QString errorMessage;
if (f.open(QIODevice::ReadOnly))
{
QByteArray bytes;
while (!f.atEnd() & !m_stop.load())
{
bytes.append(f.read(1024));
QCoreApplication::processEvents();
}
im = ext.isEmpty() ? QImage::fromData(bytes)
: QImage::fromData(bytes, qPrintable(ext));
}
else
{
errorMessage = tr("Could not read: %1").arg(url.toString());
}
QCoreApplication::processEvents();
if (!m_stop.load())
{
if (im.isNull())
{
im = QImage(QSize(128, 128), QImage::Format_ARGB32);
im.fill(qRgba(0, 30, 50, 64));
QPainter ptr;
ptr.begin(&im);
ptr.setBackgroundMode(Qt::TransparentMode);
if (errorMessage.isEmpty())
errorMessage = tr("Could not load: %1").arg(url.toString());
ptr.setPen(QColor("orange"));
ptr.drawText(im.rect(), Qt::AlignCenter, errorMessage);
ptr.end();
}
else
{
// TODO: Fix size limit
// This arbitrary size limit is really a debugging/development thing
// In a real program once you had loaded the full image, the photo-
// viewer would allow zooming and panning all around in the image
// so loading a 2896 pixel × 1944 pixel photo would make sense even
// on a small screen. For now work with fairly cruddy image quality.
// Probably the fix is to have a separate load call that re-fetches
// the full image on a zoom
QSize workSize(1024, 768);
Qt::TransformationMode mode = Qt::SmoothTransformation;
if (QThread::idealThreadCount() < 2)
{
workSize = workSize / 2;
mode = Qt::FastTransformation;
}
if (im.size().width() > workSize.width() || im.size().height() > workSize.height())
im = im.scaled(workSize, Qt::KeepAspectRatio, mode);
}
Q_ASSERT(!im.isNull());
ThumbnailableImage result(image);
result.setData(im);
// it would be nice to incur the cost of setThumbnailed() on the image
// at this point - in the background thread. Trouble is the atlas is
// constantly being accessed by the draw loop and to do anything about
// that would mean locking the GUI thread...
Q_ASSERT(!result.isNull());
emit imageLoaded(result);
}
m_loading.deref();
}
if (m_stop.load())
emit stopped();
}
void ByteReader::stop()
{
m_stop.ref();
if (!m_loading.load())
emit stopped();
}
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