ColorFilterHistogram.h

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef COLOR_FILTER_HISTOGRAM_H
#define COLOR_FILTER_HISTOGRAM_H
 
#include <QRgb>
 
class ColorFilter;
class QColor;
class QImage;

class ColorFilterHistogram
{
public:
  ColorFilterHistogram();

  int binFromPixel (const ColorFilter &filter,
                    ColorFilterMode colorFilterMode,
                    const QColor &pixel,
                    const QRgb &rgbBackground) const;

  void generate (const ColorFilter &filter,
                 double histogramBins [],
                 ColorFilterMode colorFilterMode,
                 const QImage &image,
                 int &maxBinCount) const;

  static int HISTOGRAM_BINS () { return 100; }

  int valueFromBin (const ColorFilter &filter,
                    ColorFilterMode colorFilterMode,
                    int bin);
 
private:
 
  static int FIRST_NON_EMPTY_BIN_AT_START () { return 1; }
  static int LAST_NON_EMPTY_BIN_AT_END () { return ColorFilterHistogram::HISTOGRAM_BINS () - 2; }
};
 
#endif // COLOR_FILTER_HISTOGRAM_H