#ifndef SEEN_DISPLAY_GRAYSCALE_H
#define SEEN_DISPLAY_GRAYSCALE_H

/** \file
 * Provide methods to calculate grayscale values (e.g. convert rgba value to grayscale rgba value)
 *
 * Author:
 *   Johan Engelen <goejendaagh@zonnet.nl>
 *
 * Copyright (C) 2011 Author
 *
 * Released under GNU GPL
 */

#include <gdk/gdk.h>

namespace Grayscale {
    guint32 process(guint32 rgba);
    guint32 process(guchar r, guchar g, guchar b, guchar a);
    guchar  luminance(guchar r, guchar g, guchar b);

    const float red_factor = 0.3;
    const float green_factor = 0.59;
    const float blue_factor = 0.11;

    bool activeDesktopIsGrayscale();
};

#endif /* !SEEN_DISPLAY_GRAYSCALE_H */

/*
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*/
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