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diff --git a/src/libs/widgets/common/histogramwidget.h b/src/libs/widgets/common/histogramwidget.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-07-21
+ * Description : a widget to display an image histogram.
+ *
+ * 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 HISTOGRAMWIDGET_H
+#define HISTOGRAMWIDGET_H
+
+// TQt includes.
+
+#include <tqwidget.h>
+
+// Local includes.
+
+#include "dcolor.h"
+#include "digikam_export.h"
+
+class TQCustomEvent;
+
+namespace Digikam
+{
+
+class ImageHistogram;
+class HistogramWidgetPriv;
+
+class DIGIKAM_EXPORT HistogramWidget : public TQWidget
+{
+TQ_OBJECT
+  
+
+public:
+
+    enum HistogramType
+    {
+        ValueHistogram = 0,       // Luminosity.
+        RedChannelHistogram,      // Red channel.
+        GreenChannelHistogram,    // Green channel.
+        BlueChannelHistogram,     // Blue channel.
+        AlphaChannelHistogram,    // Alpha channel.
+        ColorChannelsHistogram    // All color channels.
+    };
+
+    enum HistogramScale
+    {
+        LinScaleHistogram=0,      // Linear scale.
+        LogScaleHistogram         // Logarithmic scale.
+    };
+
+    enum HistogramAllColorMode
+    {
+        RedColor=0,               // Red color to foreground in All Colors Channel mode.
+        GreenColor,               // Green color to foreground in All Colors Channel mode.
+        BlueColor                 // Blue color to foreground in All Colors Channel mode.
+    };
+
+    enum HistogramRenderingType
+    {
+        FullImageHistogram=0,     // Full image histogram rendering.
+        ImageSelectionHistogram   // Image selection histogram rendering.
+    };
+
+public:
+
+    /** Constructor without image data. Needed to use updateData() method after to create instance.*/
+    HistogramWidget(int w, int h,                              // Widget size.
+                    TQWidget *parent=0, bool selectMode=true,
+                    bool showProgress=true,
+                    bool statisticsVisible=false);
+
+    /** Constructor with image data and without image selection data.*/
+    HistogramWidget(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, bool selectMode=true,
+                    bool showProgress=true,
+                    bool statisticsVisible=false);
+
+    /** Constructor with image data and image selection data.*/
+    HistogramWidget(int w, int h,                              // Widget size.
+                    uchar *i_data, uint i_w, uint i_h,         // Full image info.
+                    uchar *s_data, uint s_w, uint s_h,         // Image selection info.
+                    bool i_sixteenBits,                        // 8 or 16 bits image.
+                    TQWidget *parent=0, bool selectMode=true,
+                    bool showProgress=true,
+                    bool statisticsVisible=false);
+
+    void setup(int w, int h, bool selectMode=true,
+               bool showProgress=true,
+               bool statisticsVisible=false);
+
+    ~HistogramWidget();
+
+    /** Stop current histogram computations.*/
+    void stopHistogramComputation(void);
+
+    /** Update full image histogram data methods.*/
+    void updateData(uchar *i_data, uint i_w, uint i_h,
+                    bool i_sixteenBits,                        // 8 or 16 bits image.
+                    uchar *s_data=0, uint s_w=0, uint s_h=0, 
+                    bool showProgress=true);
+
+    /** Update image selection histogram data methods.*/
+    void updateSelectionData(uchar *s_data, uint s_w, uint s_h,
+                             bool i_sixteenBits,               // 8 or 16 bits image.
+                             bool showProgress=true);
+
+    void setDataLoading();
+    void setLoadingFailed();
+
+    void setHistogramGuideByColor(const DColor& color);
+
+    void reset();
+
+public:
+
+    int             m_channelType;         // Channel type to draw.
+    int             m_scaleType;           // Scale to use for drawing.
+    int             m_colorType;           // Color to use for drawing in All Colors Channel mode.
+    int             m_renderingType;       // Using full image or image selection for histogram rendering.
+
+    ImageHistogram *m_imageHistogram;      // Full image.
+    ImageHistogram *m_selectionHistogram;  // Image selection.
+
+signals:
+
+    void signalIntervalChanged(int min, int max);
+    void signalMaximumValueChanged(int);
+    void signalHistogramComputationDone(bool);
+    void signalHistogramComputationFailed();
+
+public slots:
+
+    void slotMinValueChanged(int min);
+    void slotMaxValueChanged(int max);
+
+protected slots:
+
+    void slotBlinkTimerDone();
+
+protected:
+
+    void paintEvent(TQPaintEvent*);
+    void mousePressEvent(TQMouseEvent*);
+    void mouseReleaseEvent(TQMouseEvent*);
+    void mouseMoveEvent(TQMouseEvent*);
+
+private :
+
+    void customEvent(TQCustomEvent*);
+    void notifyValuesChanged();
+
+private:
+
+    HistogramWidgetPriv* d;
+};
+
+}  // namespace Digikam
+
+#endif /* HISTOGRAMWIDGET_H */