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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtDeclarative 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qfxpixmapcache.h"
#include <QImageReader>
#include <QHash>
#include <QNetworkReply>
#include <QPixmapCache>
#include <private/qfxperf_p.h>
#include <QtDeclarative/qmlengine.h>
#include <QFile>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
class QSharedNetworkReply;
typedef QHash<QString, QSharedNetworkReply *> QFxSharedNetworkReplyHash;
static QFxSharedNetworkReplyHash qfxActiveNetworkReplies;
class QSharedNetworkReply
{
public:
QSharedNetworkReply(QNetworkReply *r) : reply(r), refCount(1) {}
~QSharedNetworkReply()
{
reply->deleteLater();
}
QNetworkReply *reply;
int refCount;
void addRef()
{
++refCount;
}
void release()
{
Q_ASSERT(refCount > 0);
--refCount;
if (refCount == 0) {
QString key = reply->url().toString();
qfxActiveNetworkReplies.remove(key);
delete this;
}
}
};
static bool readImage(QIODevice *dev, QPixmap *pixmap)
{
QImageReader imgio(dev);
//#define QT_TEST_SCALED_SIZE
#ifdef QT_TEST_SCALED_SIZE
/*
Some mechanism is needed for loading images at a limited size, especially
for remote images. Loading only thumbnails of remote progressive JPEG
images can be efficient. (Qt jpeg handler does not do so currently)
*/
QSize limit(60,60);
QSize sz = imgio.size();
if (sz.width() > limit.width() || sz.height() > limit.height()) {
sz.scale(limit,Qt::KeepAspectRatio);
imgio.setScaledSize(sz);
}
#endif
QImage img;
if (imgio.read(&img)) {
#ifdef QT_TEST_SCALED_SIZE
if (!sz.isValid())
img = img.scaled(limit,Qt::KeepAspectRatio);
#endif
*pixmap = QPixmap::fromImage(img);
return true;
} else {
return false;
}
}
/*!
\internal
\class QFxPixmapCache
\brief Enacapsultes a pixmap for QFx items.
This class is NOT reentrant.
*/
/*!
Finds the cached pixmap corresponding to \a url.
A previous call to get() must have requested the URL,
and the QNetworkReply must have finished before calling
this function.
Returns true if the image was loaded without error.
*/
bool QFxPixmapCache::find(const QUrl& url, QPixmap *pixmap)
{
#ifdef Q_ENABLE_PERFORMANCE_LOG
QFxPerfTimer<QFxPerf::PixmapLoad> perf;
#endif
QString key = url.toString();
bool ok = true;
if (!QPixmapCache::find(key,pixmap)) {
#ifndef QT_NO_LOCALFILE_OPTIMIZED_QML
if (url.scheme()==QLatin1String("file")) {
QFile f(url.toLocalFile());
if (f.open(QIODevice::ReadOnly)) {
if (!readImage(&f, pixmap)) {
qWarning() << "Format error loading" << url;
*pixmap = QPixmap();
ok = false;
}
} else {
*pixmap = QPixmap();
ok = false;
}
} else
#endif
{
QFxSharedNetworkReplyHash::Iterator iter = qfxActiveNetworkReplies.find(key);
if (iter == qfxActiveNetworkReplies.end()) {
// API usage error
qWarning() << "QFxPixmapCache: URL not loaded" << url;
ok = false;
} else {
if ((*iter)->reply->error()) {
qWarning() << "Network error loading" << url << (*iter)->reply->errorString();
*pixmap = QPixmap();
ok = false;
} else if (!readImage((*iter)->reply, pixmap)) {
qWarning() << "Format error loading" << url;
*pixmap = QPixmap();
ok = false;
}
(*iter)->release();
}
}
QPixmapCache::insert(key, *pixmap);
} else {
ok = !pixmap->isNull();
}
return ok;
}
/*!
Starts a network request to load \a url.
Returns a QNetworkReply if the image is not immediately available, otherwise
returns 0. Caller should connect to QNetworkReply::finished() to then call
find() when the image is available.
The returned QNetworkReply will be deleted when all get() calls are
matched by a corresponding find() call.
*/
QNetworkReply *QFxPixmapCache::get(QmlEngine *engine, const QUrl& url, QPixmap *pixmap)
{
#ifndef QT_NO_LOCALFILE_OPTIMIZED_QML
if (url.scheme()==QLatin1String("file")) {
QString key = url.toString();
if (!QPixmapCache::find(key,pixmap)) {
QFile f(url.toLocalFile());
if (f.open(QIODevice::ReadOnly)) {
if (!readImage(&f, pixmap)) {
qWarning() << "Format error loading" << url;
*pixmap = QPixmap();
}
} else
*pixmap = QPixmap();
QPixmapCache::insert(key, *pixmap);
}
return 0;
}
#endif
QString key = url.toString();
if (QPixmapCache::find(key,pixmap)) {
return 0;
}
QFxSharedNetworkReplyHash::Iterator iter = qfxActiveNetworkReplies.find(key);
if (iter == qfxActiveNetworkReplies.end()) {
QNetworkRequest req(url);
QSharedNetworkReply *item = new QSharedNetworkReply(engine->networkAccessManager()->get(req));
iter = qfxActiveNetworkReplies.insert(key, item);
} else {
(*iter)->addRef();
}
return (*iter)->reply;
}
/*!
Cancels a previous call to get().
May also cancel loading (eg. if no other pending request).
Any connections from the QNetworkReply returned by get() to \a obj will be
disconnected.
*/
void QFxPixmapCache::cancelGet(const QUrl& url, QObject* obj)
{
QString key = url.toString();
QFxSharedNetworkReplyHash::Iterator iter = qfxActiveNetworkReplies.find(key);
if (iter == qfxActiveNetworkReplies.end())
return;
if (obj)
QObject::disconnect((*iter)->reply, 0, obj, 0);
(*iter)->release();
}
QT_END_NAMESPACE
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