1 files changed, 104 insertions, 0 deletions
diff --git a/src/extension/internal/filter/protrusions.h b/src/extension/internal/filter/protrusions.h
new file mode 100644
index 0000000..ccf54b4
--- /dev/null
+++ b/src/extension/internal/filter/protrusions.h
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_PROTRUSIONS_H__
+#define SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_PROTRUSIONS_H__
+/* Change the 'PROTRUSIONS' above to be your file name */
+
+/*
+ * Copyright (C) 2008 Authors:
+ *   Ted Gould <ted@gould.cx>
+ * Copyright (C) 2011 Authors:
+ *   Ivan Louette (filters)
+ *   Nicolas Dufour (UI) <nicoduf@yahoo.fr>
+ *
+ * Protrusion filters
+ *   Snow
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+/* ^^^ Change the copyright to be you and your e-mail address ^^^ */
+
+#include "filter.h"
+
+#include "extension/internal/clear-n_.h"
+#include "extension/system.h"
+#include "extension/extension.h"
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+namespace Filter {
+
+
+/**
+    \brief    Custom predefined Snow filter.
+    
+    Snow has fallen on object.
+*/
+class Snow : public Inkscape::Extension::Internal::Filter::Filter {
+protected:
+	gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
+
+public:
+	Snow ( ) : Filter() { };
+	~Snow ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
+
+public:
+	static void init () {
+		// clang-format off
+		Inkscape::Extension::build_from_mem(
+			"<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+				"<name>" N_("Snow Crest") "</name>\n"
+				"<id>org.inkscape.effect.filter.snow</id>\n"
+				"<param name=\"drift\" gui-text=\"" N_("Drift Size") "\" type=\"float\" appearance=\"full\" min=\"0.0\" max=\"20.0\">3.5</param>\n"
+				"<effect>\n"
+					"<object-type>all</object-type>\n"
+					"<effects-menu>\n"
+						"<submenu name=\"" N_("Filters") "\">\n"
+   						"<submenu name=\"Protrusions\"/>\n"
+			      "</submenu>\n"
+					"</effects-menu>\n"
+					"<menu-tip>" N_("Snow has fallen on object") "</menu-tip>\n"
+				"</effect>\n"
+			"</inkscape-extension>\n", new Snow());
+		// clang-format on
+	};
+
+};
+
+gchar const *
+Snow::get_filter_text (Inkscape::Extension::Extension * ext)
+{
+	if (_filter != nullptr) g_free((void *)_filter);
+
+        std::ostringstream drift;
+        drift << ext->get_param_float("drift");
+
+	// clang-format off
+	_filter = g_strdup_printf(
+				"<filter xmlns:inkscape=\"http://www.inkscape.org/namespaces/inkscape\" style=\"color-interpolation-filters:sRGB;\" inkscape:label=\"Snow\">\n"
+					"<feConvolveMatrix order=\"3 3\" kernelMatrix=\"1 1 1 0 0 0 -1 -1 -1\" preserveAlpha=\"false\" divisor=\"3\"/>\n"
+					"<feMorphology operator=\"dilate\" radius=\"1 %s\"/>\n"
+					"<feGaussianBlur stdDeviation=\"1.6270889487870621\" result=\"result0\"/>\n"
+					"<feColorMatrix values=\"0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10 0\" result=\"result1\"/>\n"
+					"<feOffset dx=\"0\" dy=\"1\" result=\"result5\"/>\n"
+					"<feDiffuseLighting in=\"result0\" diffuseConstant=\"2.2613065326633168\" surfaceScale=\"1\">\n"
+					  "<feDistantLight azimuth=\"225\" elevation=\"32\"/>\n"
+					"</feDiffuseLighting>\n"
+					"<feComposite in2=\"result1\" operator=\"in\" result=\"result2\"/>\n"
+					"<feColorMatrix values=\"0.4 0 0 0 0.6 0 0.4 0 0 0.6 0 0 0 0 1 0 0 0 1 0\" result=\"result4\"/>\n"
+					"<feComposite in2=\"result5\" in=\"result4\"/>\n"
+					"<feComposite in2=\"SourceGraphic\"/>\n"
+				"</filter>\n", drift.str().c_str());
+	// clang-format on
+
+	return _filter;
+}; /* Snow filter */
+
+
+}; /* namespace Filter */
+}; /* namespace Internal */
+}; /* namespace Extension */
+}; /* namespace Inkscape */
+
+/* Change the 'PROTRUSIONS' below to be your file name */
+#endif /* SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_PROTRUSIONS_H__ */