nr-filter-turbulence.h

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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_NR_FILTER_TURBULENCE_H
#define SEEN_NR_FILTER_TURBULENCE_H
 
/*
 * feTurbulence filter primitive renderer
 *
 * Authors:
 *   World Wide Web Consortium <http://www.w3.org/>
 *   Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
 *   Niko Kiirala <niko@kiirala.com>
 *
 * This file has a considerable amount of code adapted from
 *  the W3C SVG filter specs, available at:
 *  http://www.w3.org/TR/SVG11/filters.html#feTurbulence
 *
 * W3C original code is licensed under the terms of
 *  the (GPL compatible) W3C® SOFTWARE NOTICE AND LICENSE:
 *  http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 *
 * Copyright (C) 2007 authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#include <memory>
#include <2geom/point.h>
 
#include "display/nr-filter-primitive.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-units.h"
 
namespace Inkscape {
namespace Filters {
 
enum FilterTurbulenceType
{
    TURBULENCE_FRACTALNOISE,
    TURBULENCE_TURBULENCE,
    TURBULENCE_ENDTYPE
};
 
class TurbulenceGenerator;
 
class FilterTurbulence : public FilterPrimitive
{
public:
    FilterTurbulence();
    ~FilterTurbulence() override;
 
    void render_cairo(FilterSlot &slot) const override;
    double complexity(Geom::Affine const &ctm) const override;
    bool uses_background() const override { return false; }
 
    void set_baseFrequency(int axis, double freq);
    void set_numOctaves(int num);
    void set_seed(double s);
    void set_stitchTiles(bool st);
    void set_type(FilterTurbulenceType t);
    void set_updated(bool u);
 
    Glib::ustring name() const override { return Glib::ustring("Turbulence"); }
 
private:
    std::unique_ptr<TurbulenceGenerator> gen;
 
    void turbulenceInit(long seed);
 
    double XbaseFrequency, YbaseFrequency;
    int numOctaves;
    double seed;
    bool stitchTiles;
    FilterTurbulenceType type;
    bool updated;
 
    double fTileWidth;
    double fTileHeight;
 
    double fTileX;
    double fTileY;
};
 
} // namespace Filters
} // namespace Inkscape
 
#endif // SEEN_NR_FILTER_TURBULENCE_H
/*
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  End:
*/
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