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/****************************************************************************
**
** ...
**
** Copyright (C) 2001-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qimageformatplugin.h"
#ifndef QT_NO_IMAGEFORMATPLUGIN
#include "qimageformatinterface_p.h"
#include "qimage.h"
/*!
\class QImageFormatPlugin qimageformatplugin.h
\brief The QImageFormatPlugin class provides an abstract base for custom image format plugins.
\ingroup plugins
The image format plugin is a simple plugin interface that makes
it easy to create custom image formats that can be used
transparently by applications.
Writing an image format plugin is achieved by subclassing this
base class, reimplementing the pure virtual functions keys() and
installIOHandler(), and exporting the class with the
Q_EXPORT_PLUGIN macro. See the \link plugins-howto.html Plugins
documentation\endlink for details.
*/
/*!
\fn QStringList QImageFormatPlugin::keys() const
Returns the list of image formats this plugin supports.
\sa installIOHandler()
*/
/*!
\fn bool QImageFormatPlugin::installIOHandler( const QString &format )
Installs a QImageIO image I/O handler for the image format \a
format.
\sa keys()
*/
class QImageFormatPluginPrivate : public QImageFormatInterface
{
public:
QImageFormatPluginPrivate( QImageFormatPlugin *p )
: plugin( p )
{
}
virtual ~QImageFormatPluginPrivate();
QRESULT queryInterface( const QUuid &iid, QUnknownInterface **iface );
Q_REFCOUNT;
QStringList featureList() const;
QRESULT loadImage( const QString &format, const QString &filename, QImage * );
QRESULT saveImage( const QString &format, const QString &filename, const QImage & );
QRESULT installIOHandler( const QString & );
private:
QImageFormatPlugin *plugin;
};
QImageFormatPluginPrivate::~QImageFormatPluginPrivate()
{
delete plugin;
}
QRESULT QImageFormatPluginPrivate::queryInterface( const QUuid &iid, QUnknownInterface **iface )
{
*iface = 0;
if ( iid == IID_QUnknown )
*iface = this;
else if ( iid == IID_QFeatureList )
*iface = this;
else if ( iid == IID_QImageFormat )
*iface = this;
else
return QE_NOINTERFACE;
(*iface)->addRef();
return QS_OK;
}
QStringList QImageFormatPluginPrivate::featureList() const
{
return plugin->keys();
}
QRESULT QImageFormatPluginPrivate::loadImage( const QString &format, const QString &filename, QImage *image )
{
return plugin->loadImage( format, filename, image ) ? QS_FALSE : QS_OK;
}
QRESULT QImageFormatPluginPrivate::saveImage( const QString &format, const QString &filename, const QImage &image )
{
return plugin->saveImage( format, filename, image ) ? QS_FALSE : QS_OK;
}
QRESULT QImageFormatPluginPrivate::installIOHandler( const QString &format )
{
return plugin->installIOHandler( format ) ? QS_FALSE : QS_OK;
}
/*!
Constructs an image format plugin. This is invoked automatically
by the Q_EXPORT_PLUGIN macro.
*/
QImageFormatPlugin::QImageFormatPlugin()
: QGPlugin( d = new QImageFormatPluginPrivate( this ) )
{
}
/*!
Destroys the image format plugin.
You never have to call this explicitly. Qt destroys a plugin
automatically when it is no longer used.
*/
QImageFormatPlugin::~QImageFormatPlugin()
{
}
/*!\internal
*/
bool QImageFormatPlugin::loadImage( const QString &format, const QString &filename, QImage *image )
{
Q_UNUSED( format )
Q_UNUSED( filename )
Q_UNUSED( image )
return FALSE;
}
/*! \internal
*/
bool QImageFormatPlugin::saveImage( const QString &format, const QString &filename, const QImage &image )
{
Q_UNUSED( format )
Q_UNUSED( filename )
Q_UNUSED( image )
return FALSE;
}
#endif // QT_NO_IMAGEFORMATPLUGIN
|
