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Diffstat (limited to 'src/kernel/qimageformatplugin.cpp')
| -rw-r--r-- | src/kernel/qimageformatplugin.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/kernel/qimageformatplugin.cpp b/src/kernel/qimageformatplugin.cpp new file mode 100644 index 0000000..ec586d4 --- /dev/null +++ b/src/kernel/qimageformatplugin.cpp @@ -0,0 +1,184 @@ +/**************************************************************************** +** +** ... +** +** 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 |