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diff --git a/krita/ui/kis_previewwidget.h b/krita/ui/kis_previewwidget.h
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+/*
+ *  kis_previewwidget.h - part of Krita
+ *
+ *  Copyright (c) 2001 John Califf  <jcaliff@compuzone.net>
+ *  Copyright (c) 2004 Bart Coppens <kde@bartcoppens.be>
+ *  Copyright (c) 2005 Cyrille Berger <cberger@cberger.net>
+ *  Copyright (c) 2007 Benjamin Schleimer <bensch128@yahoo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#ifndef __kis_previewwidget_h__
+#define __kis_previewwidget_h__
+
+#include <qimage.h>
+#include <qevent.h>
+
+#include "kis_types.h"
+
+#include "kis_previewwidgetbase.h"
+
+class QWidget;
+class KisProfile;
+class KisFilter;
+class KisFilterConfiguration;
+class QTimer;
+class KisLabelProgress;
+
+/**
+ * A widget that can be used by plugins to show a preview of the effect of the
+ * plugin to the user. This is a convenience class thand handily packs a source and a
+ * preview view together with a zoom button.
+ * It would be nice if every plugin that needs to show a preview
+ * (maybe not those that create a new image) would use this. This can prevent the distracting
+ * effect the GIMP has with a different preview for almost every filter.
+ */
+class KisPreviewWidget : public PreviewWidgetBase
+{
+    Q_OBJECT
+
+public:
+    /** Constructs the widget */
+    KisPreviewWidget( QWidget* parent = 0, const char* name = 0 );
+    virtual ~KisPreviewWidget();
+
+    /** returns if the preview is automatically updated */
+    bool getAutoUpdate() const;
+
+    void wheelEvent(QWheelEvent * e);
+
+    /** Instructs the KisPreviewWidget to eventually update the preview. 
+     * KisPreviewWidget delays the actual running of the filter for 500ms 
+     * so if the user is changing a configuration setting, it won't run multiple time.
+     * @param filter to run on the image
+     * @config to use when filtering.
+     */
+    void runFilter(KisFilter * filter, KisFilterConfiguration * config);
+
+public slots:
+
+    /** Sets the preview to use the layer specified as argument */
+    void slotSetDevice(KisPaintDeviceSP dev);
+
+    /** Enables or disables the automatically updating of the preview */
+    void slotSetAutoUpdate(bool set);
+
+    /** Toggle between display preview and display original */
+    void setPreviewDisplayed(bool v);
+    
+    /** use to indicate that the preview need to be updated. */
+    void needUpdate();
+    
+signals:
+    /** This is emitted when the position or zoom factor of the widget has changed */
+    void updated();
+
+private slots:
+
+    void zoomIn();
+    void zoomOut();
+    void zoomOneToOne();
+
+    /**
+     * Called when the "Force Update" button is clicked
+     */
+    void forceUpdate();
+
+    /**
+     * Updates the zoom and redisplays either the original or the preview (filtered) image
+     */
+    void updateZoom();
+
+    /** Internal method which actually runs the filter
+     */
+    void runFilterHelper();
+
+private:
+    /**
+     * Recalculates the zoom factor
+     */
+    void zoomChanged(const double zoom);
+
+    bool m_autoupdate; /// Flag indicating that the widget should auto update whenever a setting is changed
+    bool m_previewIsDisplayed; /// Flag indicating whether the filtered or original image is displayed
+
+    QImage m_scaledOriginal; /// QImage copy of the original image
+    bool m_dirtyOriginal; /// flag indicating that the original image is dirty
+    KisPaintDeviceSP m_origDevice; /// Pointer to the original image
+    
+    QImage m_scaledPreview; /// QImage copy of the filtered image
+    bool m_dirtyPreview; /// flag indicating that the preview image is dirty
+    KisPaintDeviceSP m_previewDevice; /// Pointer to the preview image
+    KisImageSP m_scaledImage; /// Scaled image copied from the original
+
+    double m_filterZoom; /// Zoom amount when the filtering occurred
+    double m_zoom; /// Current zoom amount
+    KisProfile * m_profile; /// the color profile to use when converting to QImage
+
+    KisLabelProgress *m_progress; /// Progress bar of the preview.
+
+    QTimer * m_zoomTimer; /// Timer used to update the view whenever the zoom changes
+    QTimer * m_filterTimer; /// Timer used to update the view whenever the filter changes
+    KisFilter * m_filter; /// Filter used
+    KisFilterConfiguration * m_config; /// Configuration used
+    bool m_firstFilter; /// Flag to determine if we should delay the first filter or not
+    bool m_firstZoom; ///  Flag to determine if we should delay the first zoom or not
+};
+
+#endif