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diff --git a/krita/plugins/viewplugins/histogram_docker/kis_accumulating_producer.h b/krita/plugins/viewplugins/histogram_docker/kis_accumulating_producer.h
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+++ b/krita/plugins/viewplugins/histogram_docker/kis_accumulating_producer.h
@@ -0,0 +1,76 @@
+/*
+ * This file is part of Krita
+ *
+ * Copyright (c) 2005 Bart Coppens <kde@bartcoppens.be>
+ *
+ *  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_ACCUMULATING_PRODUCER_H_
+#define _KIS_ACCUMULATING_PRODUCER_H_
+
+#include <qobject.h>
+
+#include <kis_basic_histogram_producers.h>
+#include "kis_cachedhistogram.h"
+
+/**
+ * Kept very minimalistic because all options would require much reiterating which we don't want.
+ * This class is multithreading! Don't expect it to contain the right data after an
+ * addRegionsToBinAsync call, but await it's completed() signal. Also beware! This function
+ * _does_ clear() before addRegionsToBinAsync! (hence not conforming to the regular semantics
+ * of HistogramProducers if you'd take addRegionsToBinAsync = addRegionToBin, but since that is
+ * already violated with the asynchronousity of it that is not really an issue anymore, I think)
+ **/
+class KisAccumulatingHistogramProducer : public QObject, public KisBasicHistogramProducer {
+Q_OBJECT
+public:
+    KisAccumulatingHistogramProducer(KisCachedHistogramObserver::Producers* source);
+    ~KisAccumulatingHistogramProducer();
+    /// Does _nothing_, use addRegionsToBinAsync
+    virtual void addRegionToBin(Q_UINT8 *, Q_UINT8*, Q_UINT32, KisColorSpace *) {}
+    virtual void addRegionsToBinAsync();
+    virtual QString positionToString(double pos) const
+        { return m_source->at(0)->positionToString(pos); }
+
+    virtual void setView(double, double) {} // No view support
+    virtual double maximalZoom() const { return 1.0; }
+
+    virtual Q_INT32 numberOfBins() { return m_source->at(0)->numberOfBins(); }
+
+    virtual QValueVector<KisChannelInfo *> channels() { return m_source->at(0)->channels(); }
+
+    /// Call this when the 'source' list has changed colorspace
+    virtual void changedSourceProducer() {
+        m_count = m_source->at(0)->channels().count();
+        m_external.clear();
+        makeExternalToInternal();
+    }
+
+signals:
+    void completed();
+
+protected:
+    virtual void customEvent(QCustomEvent* e);
+    /// source already converts external to internal
+    virtual int externalToInternal(int ext) { return ext; }
+    KisCachedHistogramObserver::Producers* m_source;
+
+    class ThreadedProducer;
+    friend class ThreadedProducer;
+    ThreadedProducer* m_thread;
+};
+
+#endif // _KIS_ACCUMULATING_PRODUCER_H_