/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2004-07-21
 * Description : image histogram manipulation methods.
 *
 * Copyright (C) 2004-2009 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 IMAGEHISTOGRAM_H
#define IMAGEHISTOGRAM_H

// Qt includes

#include <QtCore/QEvent>
#include <QtCore/QThread>

// Local includes

#include "digikam_export.h"

class QObject;

namespace Digikam
{

class ImageHistogramPriv;
class DImg;

class DIGIKAM_EXPORT ImageHistogram : public QThread
{
    Q_OBJECT

public:

    ImageHistogram(const uchar *i_data, uint i_w, uint i_h, bool i_sixteenBits, QObject *parent = 0);
    explicit ImageHistogram(const DImg& image, QObject *parent = 0);
    ~ImageHistogram();

    /** Started computation: synchronous or threaded */
    void calculate();
    void calculateInThread();

    /** Stop threaded computation. */
    void stopCalculation();
    bool isCalculating();

    /** Methods to access the histogram data.*/
    bool   isSixteenBit();
    bool   isValid();
    double getCount(int channel, int start, int end);
    double getMean(int channel, int start, int end);
    double getPixels();
    double getStdDev(int channel, int start, int end);
    double getValue(int channel, int bin);
    double getMaximum(int channel, int start, int end);

    int    getHistogramSegments(void);
    int    getMaxSegmentIndex(void);
    int    getMedian(int channel, int start, int end);

Q_SIGNALS:

    void calculationStarted(const ImageHistogram *histogram);
    void calculationFinished(const ImageHistogram *histogram, bool success);

protected:

    virtual void run();

private:

    void setup(const uchar *i_data, uint i_w, uint i_h, bool i_sixteenBits);
    void postProgress(bool starting, bool success);

private:

    ImageHistogramPriv* const d;
};

}  // namespace Digikam

#endif /* IMAGEHISTOGRAM_H */
