extrafiltersplugin.h Example File
tools/plugandpaintplugins/extrafilters/extrafiltersplugin.h

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 #ifndef EXTRAFILTERSPLUGIN_H
 #define EXTRAFILTERSPLUGIN_H

 #include <QObject>
 #include <QStringList>
 #include <QImage>

 #include <plugandpaint/interfaces.h>

 class ExtraFiltersPlugin : public QObject, public FilterInterface
 {
     Q_OBJECT
     Q_INTERFACES(FilterInterface)

 public:
     QStringList filters() const;
     QImage filterImage(const QString &filter, const QImage &image,
                        QWidget *parent);
 };

 #endif