tqt3/src/kernel/qimageformatplugin.cpp

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#include "ntqimageformatplugin.h"
#ifndef TQT_NO_IMAGEFORMATPLUGIN
#include "qimageformatinterface_p.h"
#include "ntqimage.h"

/*!
    \class TQImageFormatPlugin ntqimageformatplugin.h
    \brief The TQImageFormatPlugin 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
    TQ_EXPORT_PLUGIN macro.  See the \link plugins-howto.html Plugins
    documentation\endlink for details.
*/

/*!
    \fn TQStringList TQImageFormatPlugin::keys() const

    Returns the list of image formats this plugin supports.

    \sa installIOHandler()
*/


/*!
    \fn  bool TQImageFormatPlugin::installIOHandler( const TQString &format )

    Installs a TQImageIO image I/O handler for the image format \a
    format.

    \sa keys()
*/

class TQImageFormatPluginPrivate : public TQImageFormatInterface
{
public:
    TQImageFormatPluginPrivate( TQImageFormatPlugin *p )
	: plugin( p )
    {
    }
    virtual ~TQImageFormatPluginPrivate();

    TQRESULT queryInterface( const TQUuid &iid, TQUnknownInterface **iface );
    TQ_REFCOUNT;

    TQStringList featureList() const;

    TQRESULT loadImage( const TQString &format, const TQString &filename, TQImage * );
    TQRESULT saveImage( const TQString &format, const TQString &filename, const TQImage & );

    TQRESULT installIOHandler( const TQString & );

private:
    TQImageFormatPlugin *plugin;
};

TQImageFormatPluginPrivate::~TQImageFormatPluginPrivate()
{
    delete plugin;
}

TQRESULT TQImageFormatPluginPrivate::queryInterface( const TQUuid &iid, TQUnknownInterface **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 TQE_NOINTERFACE;

    (*iface)->addRef();
    return TQS_OK;
}

TQStringList TQImageFormatPluginPrivate::featureList() const
{
    return plugin->keys();
}

TQRESULT TQImageFormatPluginPrivate::loadImage( const TQString &format, const TQString &filename, TQImage *image )
{
    return plugin->loadImage( format, filename, image ) ? TQS_FALSE : TQS_OK;
}

TQRESULT TQImageFormatPluginPrivate::saveImage( const TQString &format, const TQString &filename, const TQImage &image )
{
    return plugin->saveImage( format, filename, image ) ? TQS_FALSE : TQS_OK;
}

TQRESULT TQImageFormatPluginPrivate::installIOHandler( const TQString &format )
{
    return plugin->installIOHandler( format ) ? TQS_FALSE : TQS_OK;
}

/*!
    Constructs an image format plugin. This is invoked automatically
    by the TQ_EXPORT_PLUGIN macro.
*/
TQImageFormatPlugin::TQImageFormatPlugin()
    : TQGPlugin( d = new TQImageFormatPluginPrivate( this ) )
{
}

/*!
    Destroys the image format plugin.

    You never have to call this explicitly. TQt destroys a plugin
    automatically when it is no longer used.
*/
TQImageFormatPlugin::~TQImageFormatPlugin()
{
}


/*!\internal
 */
bool TQImageFormatPlugin::loadImage( const TQString &format, const TQString &filename, TQImage *image )
{
    Q_UNUSED( format )
    Q_UNUSED( filename )
    Q_UNUSED( image )
    return FALSE;
}

/*! \internal
 */
bool TQImageFormatPlugin::saveImage( const TQString &format, const TQString &filename, const TQImage &image )
{
    Q_UNUSED( format )
    Q_UNUSED( filename )
    Q_UNUSED( image )
    return FALSE;
}

#endif // TQT_NO_IMAGEFORMATPLUGIN