ColorFilter.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_H
#define COLOR_FILTER_H
 
#include "ColorFilterEntry.h"
#include "ColorFilterMode.h"
#include <QList>
#include <QMap>
#include <QRgb>
 
class ColorFilterStrategyAbstractBase;
class QImage;

class ColorFilter
{
public:
  ColorFilter();

  ~ColorFilter();

  bool colorCompare (QRgb rgb1,
                     QRgb rgb2) const;

  void filterImage (const QImage &imageOriginal,
                    QImage &imageFiltered,
                    ColorFilterMode colorFilterMode,
                    double low,
                    double high,
                    QRgb rgbBackground);

  QRgb marginColor(const QImage *image) const;

  bool pixelFilteredIsOn (const QImage &image,
                          int x,
                          int y) const;

  double pixelToZeroToOneOrMinusOne (ColorFilterMode colorFilterMode,
                                     const QColor &pixel,
                                     QRgb rgbBackground) const;

  bool pixelUnfilteredIsOn (ColorFilterMode colorFilterMode,
                            const QColor &pixel,
                            QRgb rgbBackground,
                            double low0To1,
                            double high0To1) const;

  int zeroToOneToValue (ColorFilterMode colorFilterMode,
                        double s) const;
 
private:
 
  void createStrategies ();
 
  typedef QList<ColorFilterEntry> ColorList;
 
  void mergePixelIntoColorCounts (QRgb pixel,
                                  ColorList &colorCounts) const;
 
  // Strategies for mode-specific computations
  QMap<ColorFilterMode, ColorFilterStrategyAbstractBase*> m_strategies;
 
};
 
#endif // COLOR_FILTER_H