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diff --git a/krita/plugins/viewplugins/histogram_docker/histogramdocker.h b/krita/plugins/viewplugins/histogram_docker/histogramdocker.h
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+++ b/krita/plugins/viewplugins/histogram_docker/histogramdocker.h
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+/*
+ * This file is part of Krita
+ *
+ * Copyright (c) 2005 Bart Coppens <[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 _HISTOGRAMDOCKER_H_
+#define _HISTOGRAMDOCKER_H_
+
+#include <qobject.h>
+#include <qpopupmenu.h>
+
+#include <kparts/plugin.h>
+#include <kis_histogram_view.h>
+#include <kis_histogram.h>
+
+#include "kis_cachedhistogram.h"
+
+class KisAccumulatingHistogramProducer;
+class KisColorSpace;
+class KisHistogramView;
+class KisView;
+class KisColorSpace;
+
+class KritaHistogramDocker : public KParts::Plugin
+{
+Q_OBJECT
+public:
+    KritaHistogramDocker(QObject *parent, const char *name, const QStringList &);
+    virtual ~KritaHistogramDocker();
+private slots:
+    void producerChanged(int pos);
+    void popupMenu(const QPoint & pos);
+    void colorSpaceChanged(KisColorSpace* cs);
+private:
+    KisHistogramProducerFactory* m_factory;
+    KisCachedHistogramObserver::Producers m_producers;
+    KisAccumulatingHistogramProducer* m_producer;
+    KisColorSpace* m_cs;
+    KisView* m_view;
+    KisHistogramView* m_hview;
+    KisImageRasteredCache* m_cache;
+    QPopupMenu m_popup;
+    KisHistogramSP m_histogram;
+    uint m_currentProducerPos;
+};
+
+class KisGenericRGBHistogramProducerFactory;
+
+class HistogramDockerUpdater : public QObject {
+Q_OBJECT
+public:
+    HistogramDockerUpdater(QObject* parent, KisHistogramSP h, KisHistogramView* v,
+                           KisAccumulatingHistogramProducer* p);
+public slots:
+    void updated();
+private slots:
+    void completed();
+private:
+    KisHistogramSP m_histogram;
+    KisHistogramView* m_view;
+    KisAccumulatingHistogramProducer* m_producer;
+};
+
+#endif //_HISTOGRAMDOCKER_H_