nr-filter-primitive.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SVG filters rendering
 *
 * Author:
 *   Niko Kiirala <niko@kiirala.com>
 *
 * Copyright (C) 2006-2007 Niko Kiirala
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
#ifndef SEEN_NR_FILTER_PRIMITIVE_H
#define SEEN_NR_FILTER_PRIMITIVE_H
 
#include <memory>
#include <2geom/forward.h>
#include <2geom/rect.h>
 
#include <glibmm/ustring.h>
 
#include "display/nr-filter-types.h"
#include "svg/svg-length.h"
#include "style-enums.h"
 
class SPStyle;
 
namespace Inkscape {
namespace Filters {
 
class FilterSlot;
class FilterUnits;
 
class FilterPrimitive
{
public:
    FilterPrimitive();
    virtual ~FilterPrimitive();
 
    virtual void update() {}
    virtual void render_cairo(FilterSlot &slot) const;
    virtual void area_enlarge(Geom::IntRect &area, Geom::Affine const &m) const {}
 
    virtual void set_input(int slot);
 
    virtual void set_input(int input, int slot);
 
    virtual void set_output(int slot);
 
    // returns cache score factor, reflecting the cost of rendering this filter
    // this should return how many times slower this primitive is that normal rendering
    virtual double complexity(Geom::Affine const &/*ctm*/) const { return 1.0; }
 
    virtual bool uses_background() const
    {
        return _input == NR_FILTER_BACKGROUNDIMAGE || _input == NR_FILTER_BACKGROUNDALPHA;
    }
 
    void set_x(SVGLength const &length);
    void set_y(SVGLength const &length);
    void set_width(SVGLength const &length);
    void set_height(SVGLength const &length);
    void set_subregion(SVGLength const &x, SVGLength const &y,
                       SVGLength const &width, SVGLength const &height);
 
    Geom::Rect filter_primitive_area(FilterUnits const &units) const;
 
    virtual bool can_handle_affine(Geom::Affine const &) const { return false; }
 
    void setStyle(SPStyle const *style);
 
    // Useful for debugging
    virtual Glib::ustring name() const { return "No name"; }
 
protected:
    int _input;
    int _output;
 
    /* Filter primitive subregion */
    SVGLength _subregion_x;
    SVGLength _subregion_y;
    SVGLength _subregion_width;
    SVGLength _subregion_height;
 
    SPColorInterpolation color_interpolation;
};
 
} // namespace Filters
} // namespace Inkscape
 
#endif // SEEN_NR_FILTER_PRIMITIVE_H
/*
  Local Variables:
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  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
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