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diff --git a/src/libs/widgets/common/curveswidget.h b/src/libs/widgets/common/curveswidget.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-12-01
+ * Description : a widget to draw histogram curves
+ *
+ * Copyright (C) 2004-2008 by Gilles Caulier <caulier dot gilles at gmail dot 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, 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.
+ *
+ * ============================================================ */
+
+#ifndef CURVESWIDGET_H
+#define CURVESWIDGET_H
+
+// TQt includes.
+
+#include <tqwidget.h>
+
+// Local includes.
+
+#include "dcolor.h"
+#include "digikam_export.h"
+
+class TQCustomEvent;
+
+namespace Digikam
+{
+
+class ImageHistogram;
+class ImageCurves;
+class CurvesWidgetPriv;
+
+class DIGIKAM_EXPORT CurvesWidget : public TQWidget
+{
+TQ_OBJECT
+  
+
+public:
+
+    enum HistogramType
+    {
+        ValueHistogram = 0,       // Luminosity.
+        RedChannelHistogram,      // Red channel.
+        GreenChannelHistogram,    // Green channel.
+        BlueChannelHistogram,     // Blue channel.
+        AlphaChannelHistogram,    // Alpha channel.
+    };
+
+    enum HistogramScale
+    {
+        LinScaleHistogram=0,      // Linear scale.
+        LogScaleHistogram         // Logarithmic scale.
+    };
+
+public:
+
+    CurvesWidget(int w, int h, TQWidget *parent, bool readOnly=false);
+
+    CurvesWidget(int w, int h,                         // Widget size.
+                 uchar *i_data, uint i_w, uint i_h,    // Full image info.
+                 bool i_sixteenBits,                   // 8 or 16 bits image.
+                 TQWidget *parent=0,                    // Parent widget instance.
+                 bool readOnly=false);                 // If true : widget with full edition mode capabilities.
+                                                       // If false : display curve data only without edition.
+
+    ~CurvesWidget();
+
+    void setup(int w, int h, bool readOnly);
+    void updateData(uchar *i_data, uint i_w, uint i_h, bool i_sixteenBits);
+
+    // Stop current histogram computations.
+    void stopHistogramComputation();
+
+    void setDataLoading();
+    void setLoadingFailed();
+
+    void reset();
+    void curveTypeChanged();
+    void setCurveGuide(const DColor& color);
+
+    ImageCurves* curves() const;
+
+public:
+
+    int             m_channelType;     // Channel type to draw.
+    int             m_scaleType;       // Scale to use for drawing.
+
+    ImageHistogram *m_imageHistogram;
+
+signals:
+
+    void signalMouseMoved( int x, int y );
+    void signalCurvesChanged();
+    void signalHistogramComputationDone();
+    void signalHistogramComputationFailed();
+
+protected slots:
+
+    void slotBlinkTimerDone();
+
+protected:
+
+    void paintEvent(TQPaintEvent*);
+    void mousePressEvent(TQMouseEvent*);
+    void mouseReleaseEvent(TQMouseEvent*);
+    void mouseMoveEvent(TQMouseEvent*);
+    void leaveEvent(TQEvent*);
+
+private:
+
+    void customEvent(TQCustomEvent *event);
+
+private:
+
+    CurvesWidgetPriv* d;
+};
+
+}  // NameSpace Digikam
+
+#endif /* CURVESWIDGET_H */