/****************************************************************************
** $Id: qimageformatplugin.cpp,v 1.1 2003/12/04 08:17:59 falbujer Exp $
**
** ...
**
** Copyright (C) 2001-2002 Trolltech AS. All rights reserved.
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** This file is part of the kernel module of the Qt GUI Toolkit.
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** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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** licenses may use this file in accordance with the Qt Commercial License
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**********************************************************************/
#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
