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diff --git a/krita/core/kis_paintop.h b/krita/core/kis_paintop.h
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+/*
+ *  Copyright (c) 2002 Patrick Julien <[email protected]>
+ *  Copyright (c) 2004 Boudewijn Rempt <[email protected]>
+ *  Copyright (c) 2004 Clarence Dang <[email protected]>
+ *  Copyright (c) 2004 Adrian Page <[email protected]>
+ *  Copyright (c) 2004 Cyrille Berger <[email protected]>
+ *
+ *  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_PAINTOP_H_
+#define KIS_PAINTOP_H_
+
+#include <qstring.h>
+
+#include <ksharedptr.h>
+#include <klocale.h>
+
+#include "kis_global.h"
+#include "kis_types.h"
+#include "kis_id.h"
+#include "kis_vec.h"
+#include "kis_colorspace.h"
+
+#include <koffice_export.h>
+
+class KisPoint;
+class KisAlphaMask;
+class KisPainter;
+class KisColorSpace;
+class KisInputDevice;
+class QWidget;
+
+/**
+ * This class keeps information that can be used in the painting process, for example by
+ * brushes.
+ **/
+class KRITACORE_EXPORT KisPaintInformation {
+public:
+    KisPaintInformation(double pressure = PRESSURE_DEFAULT,
+                        double xTilt = 0.0, double yTilt = 0.0,
+                        KisVector2D movement = KisVector2D())
+        : pressure(pressure), xTilt(xTilt), yTilt(yTilt), movement(movement) {}
+    double pressure;
+    double xTilt;
+    double yTilt;
+    KisVector2D movement;
+};
+
+class KRITACORE_EXPORT KisPaintOp : public KShared
+{
+
+public:
+
+    KisPaintOp(KisPainter * painter);
+    virtual ~KisPaintOp();
+
+    virtual void paintAt(const KisPoint &pos, const KisPaintInformation& info) = 0;
+    void setSource(KisPaintDeviceSP p);
+
+    /**
+     * Whether this paintop wants to deposit paint even when not moving, i.e. the
+     * tool needs to activate its timer.
+     */
+    virtual bool incremental() { return false; }
+
+
+protected:
+
+    virtual KisPaintDeviceSP computeDab(KisAlphaMaskSP mask);
+    virtual KisPaintDeviceSP computeDab(KisAlphaMaskSP mask, KisColorSpace *cs);
+
+
+    /**
+     * Split the coordinate into whole + fraction, where fraction is always >= 0.
+     */
+    virtual void splitCoordinate(double coordinate, Q_INT32 *whole, double *fraction);
+
+    KisPainter * m_painter;
+    KisPaintDeviceSP m_source; // use this layer as source layer for the operation
+private:
+    KisPaintDeviceSP m_dab;
+};
+
+class KisPaintOpSettings {
+
+public:
+    KisPaintOpSettings(QWidget *parent) { Q_UNUSED(parent); }
+    virtual ~KisPaintOpSettings() {}
+
+    virtual QWidget *widget() const { return 0; }
+};
+
+/**
+ * The paintop factory is responsible for creating paintops of the specified class.
+ * If there is an optionWidget, the derived paintop itself must support settings,
+ * and it's up to the factory to do that.
+ */
+class KisPaintOpFactory  : public KShared
+{
+
+public:
+    KisPaintOpFactory() {}
+    virtual ~KisPaintOpFactory() {}
+
+    virtual KisPaintOp * createOp(const KisPaintOpSettings *settings, KisPainter * painter) = 0;
+    virtual KisID id() { return KisID("abstractpaintop", i18n("Abstract PaintOp")); }
+
+    /**
+     * The filename of the pixmap we can use to represent this paintop in the ui.
+     */
+    virtual QString pixmap() { return ""; }
+
+    /**
+     * Whether this paintop is internal to a certain tool or can be used
+     * in various tools. If false, it won't show up in the toolchest.
+     * The KisColorSpace argument can be used when certain paintops only support a specific cs
+     */
+    virtual bool userVisible(KisColorSpace * cs = 0) { return cs->id() != KisID("WET", ""); }
+
+    /**
+     * Create and return an (abstracted) widget with options for this paintop when used with the 
+     * specified input device. Return 0 if there are no settings available for the given
+     * device.
+     */
+    virtual KisPaintOpSettings* settings(QWidget* parent, const KisInputDevice& inputDevice);
+
+};
+#endif // KIS_PAINTOP_H_