qgsprevieweffect.h

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/***************************************************************************
                         qgsprevieweffect.h
                             -------------------
    begin                : March 2014
    copyright            : (C) 2014 by Nyall Dawson
    email                : nyall dot dawson 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 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSPREVIEWEFFECT_H
#define QGSPREVIEWEFFECT_H

#include <QGraphicsEffect>

class GUI_EXPORT QgsPreviewEffect: public QGraphicsEffect
{
    Q_OBJECT

  public:
    enum PreviewMode
    {
      PreviewGrayscale,
      PreviewMono,
      PreviewProtanope,
      PreviewDeuteranope
    };

    QgsPreviewEffect( QObject* parent );
    ~QgsPreviewEffect();

    void setMode( PreviewMode mode );
    PreviewMode mode() const { return mMode; }

  protected:
    virtual void draw( QPainter *painter ) override;

  private:

    PreviewMode mMode;

    QRgb simulateColorBlindness( QRgb &originalColor, PreviewMode type );
    void simulateProtanopeLMS( double &L, double &M, double &S );
    void simulateDeuteranopeLMS( double &L, double &M, double &S );
};

#endif // QGSPREVIEWEFFECT_H