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 "qgis_gui.h"
#include "qgis_sip.h"
 
#include <QGraphicsEffect>

 
class GUI_EXPORT QgsPreviewEffect : public QGraphicsEffect
{
    Q_OBJECT
 
  public:
    enum PreviewMode
    {
      PreviewGrayscale,
      PreviewMono,
      PreviewProtanope,
      PreviewDeuteranope,
      PreviewTritanope
    };
 
    QgsPreviewEffect( QObject *parent SIP_TRANSFERTHIS );

    void setMode( PreviewMode mode );

    PreviewMode mode() const { return mMode; }
 
  protected:
    void draw( QPainter *painter ) override;
 
  private:
    PreviewMode mMode = PreviewGrayscale;
 
    QRgb simulateColorBlindness( QRgb &originalColor, PreviewMode type );
    void simulateGrayscale( int &r, int &g, int &b, int &red, int &green, int &blue );
    void simulateProtanope( int &r, int &g, int &b, int &red, int &green, int &blue );
    void simulateDeuteranope( int &r, int &g, int &b, int &red, int &green, int &blue );
    void simulateTritanope( int &r, int &g, int &b, int &red, int &green, int &blue );
};
 
#endif // QGSPREVIEWEFFECT_H