// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_NR_FILTER_GAUSSIAN_H
#define SEEN_NR_FILTER_GAUSSIAN_H

/*
 * Gaussian blur renderer
 *
 * Authors:
 *   Niko Kiirala <niko@kiirala.com>
 *   bulia byak
 *   Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
 *
 * Copyright (C) 2006 authors
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */

#include <2geom/forward.h>
#include "display/nr-filter-primitive.h"

enum {
    BLUR_QUALITY_BEST = 2,
    BLUR_QUALITY_BETTER = 1,
    BLUR_QUALITY_NORMAL = 0,
    BLUR_QUALITY_WORSE = -1,
    BLUR_QUALITY_WORST = -2
};

namespace Inkscape {
namespace Filters {

class FilterGaussian : public FilterPrimitive {
public:
    FilterGaussian();
    static FilterPrimitive *create();
    ~FilterGaussian() override;

    void render_cairo(FilterSlot &slot) override;
    void area_enlarge(Geom::IntRect &area, Geom::Affine const &m) override;
    bool can_handle_affine(Geom::Affine const &m) override;
    double complexity(Geom::Affine const &ctm) override;

    /**
     * Set the standard deviation value for gaussian blur. Deviation along
     * both axis is set to the provided value.
     * Negative value, NaN and infinity are considered an error and no
     * changes to filter state are made. If not set, default value of zero
     * is used, which means the filter results in transparent black image.
     */
    void set_deviation(double deviation);
    /**
     * Set the standard deviation value for gaussian blur. First parameter
     * sets the deviation alogn x-axis, second along y-axis.
     * Negative value, NaN and infinity are considered an error and no
     * changes to filter state are made. If not set, default value of zero
     * is used, which means the filter results in transparent black image.
     */
    void set_deviation(double x, double y);

    Glib::ustring name() override { return Glib::ustring("Gaussian Blur"); }

private:
    double _deviation_x;
    double _deviation_y;
};


} /* namespace Filters */
} /* namespace Inkscape */




#endif /* __NR_FILTER_GAUSSIAN_H__ */
/*
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  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
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  End:
*/
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