1 files changed, 96 insertions, 0 deletions
diff --git a/src/display/nr-filter-turbulence.h b/src/display/nr-filter-turbulence.h
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+++ b/src/display/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 <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();
+    static FilterPrimitive *create();
+    ~FilterTurbulence() override;
+
+    void render_cairo(FilterSlot &slot) override;
+    double complexity(Geom::Affine const &ctm) override;
+    bool uses_background() 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() override { return Glib::ustring("Turbulence"); }
+
+private:
+
+    TurbulenceGenerator *gen;
+
+    void turbulenceInit(long seed);
+
+    double XbaseFrequency, YbaseFrequency;
+    int numOctaves;
+    double seed;
+    bool stitchTiles;
+    FilterTurbulenceType type;
+    bool updated;
+    unsigned char *pix_data;
+
+    double fTileWidth;
+    double fTileHeight;
+
+    double fTileX;
+    double fTileY;
+
+};
+
+} /* namespace Filters */
+} /* namespace Inkscape */
+
+#endif /* __NR_FILTER_TURBULENCE_H__ */
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :