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diff --git a/src/extension/internal/filter/shadows.h b/src/extension/internal/filter/shadows.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_SHADOWS_H__
+#define SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_SHADOWS_H__
+/* Change the 'SHADOWS' above to be your file name */
+
+/*
+ * Copyright (C) 2013 Authors:
+ * Ivan Louette (filters)
+ * Nicolas Dufour (UI) <nicoduf@yahoo.fr>
+ *
+ * Shadow filters
+ * Drop shadow
+ *
+ * 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 Drop shadow filter.
+
+ Colorizable Drop shadow.
+
+ Filter's parameters:
+ * Blur radius (0.->200., default 3) -> blur (stdDeviation)
+ * Horizontal offset (-50.->50., default 6.0) -> offset (dx)
+ * Vertical offset (-50.->50., default 6.0) -> offset (dy)
+ * Blur type (enum, default outer) ->
+ outer = composite1 (operator="in"), composite2 (operator="over", in1="SourceGraphic", in2="offset")
+ inner = composite1 (operator="out"), composite2 (operator="atop", in1="offset", in2="SourceGraphic")
+ innercut = composite1 (operator="in"), composite2 (operator="out", in1="offset", in2="SourceGraphic")
+ outercut = composite1 (operator="out"), composite2 (operator="in", in1="SourceGraphic", in2="offset")
+ shadow = composite1 (operator="out"), composite2 (operator="atop", in1="offset", in2="offset")
+ * Color (guint, default 0,0,0,127) -> flood (flood-opacity, flood-color)
+ * Use object's color (boolean, default false) -> composite1 (in1, in2)
+*/
+class ColorizableDropShadow : public Inkscape::Extension::Internal::Filter::Filter {
+protected:
+ gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
+
+public:
+ ColorizableDropShadow ( ) : Filter() { };
+ ~ColorizableDropShadow ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
+
+ static void init () {
+ // clang-format off
+ Inkscape::Extension::build_from_mem(
+ "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+ "<name>" N_("Drop Shadow") "</name>\n"
+ "<id>org.inkscape.effect.filter.ColorDropShadow</id>\n"
+ "<param name=\"tab\" type=\"notebook\">\n"
+ "<page name=\"optionstab\" gui-text=\"" N_("Options") "\">\n"
+ "<param name=\"blur\" gui-text=\"" N_("Blur radius (px)") "\" type=\"float\" appearance=\"full\" min=\"0.0\" max=\"200.0\">3.0</param>\n"
+ "<param name=\"xoffset\" gui-text=\"" N_("Horizontal offset (px)") "\" type=\"float\" appearance=\"full\" min=\"-50.0\" max=\"50.0\">6.0</param>\n"
+ "<param name=\"yoffset\" gui-text=\"" N_("Vertical offset (px)") "\" type=\"float\" appearance=\"full\" min=\"-50.0\" max=\"50.0\">6.0</param>\n"
+ "<param name=\"type\" gui-text=\"" N_("Shadow type:") "\" type=\"optiongroup\" appearance=\"combo\" >\n"
+ "<option value=\"outer\">" N_("Outer") "</option>\n"
+ "<option value=\"inner\">" N_("Inner") "</option>\n"
+ "<option value=\"outercut\">" N_("Outer cutout") "</option>\n"
+ "<option value=\"innercut\">" N_("Inner cutout") "</option>\n"
+ "<option value=\"shadow\">" N_("Shadow only") "</option>\n"
+ "</param>\n"
+ "</page>\n"
+ "<page name=\"coltab\" gui-text=\"" N_("Blur color") "\">\n"
+ "<param name=\"color\" gui-text=\"" N_("Color") "\" type=\"color\">127</param>\n"
+ "<param name=\"objcolor\" gui-text=\"" N_("Use object's color") "\" type=\"bool\" >false</param>\n"
+ "</page>\n"
+ "</param>\n"
+ "<effect>\n"
+ "<object-type>all</object-type>\n"
+ "<effects-menu>\n"
+ "<submenu name=\"" N_("Filters") "\">\n"
+ "<submenu name=\"" N_("Shadows and Glows") "\"/>\n"
+ "</submenu>\n"
+ "</effects-menu>\n"
+ "<menu-tip>" N_("Colorizable Drop shadow") "</menu-tip>\n"
+ "</effect>\n"
+ "</inkscape-extension>\n", new ColorizableDropShadow());
+ // clang-format on
+ };
+
+};
+
+gchar const *
+ColorizableDropShadow::get_filter_text (Inkscape::Extension::Extension * ext)
+{
+ if (_filter != nullptr) g_free((void *)_filter);
+
+ std::ostringstream blur;
+ std::ostringstream a;
+ std::ostringstream r;
+ std::ostringstream g;
+ std::ostringstream b;
+ std::ostringstream x;
+ std::ostringstream y;
+ std::ostringstream comp1in1;
+ std::ostringstream comp1in2;
+ std::ostringstream comp1op;
+ std::ostringstream comp2in1;
+ std::ostringstream comp2in2;
+ std::ostringstream comp2op;
+
+ const gchar *type = ext->get_param_optiongroup("type");
+ guint32 color = ext->get_param_color("color");
+
+ blur << ext->get_param_float("blur");
+ x << ext->get_param_float("xoffset");
+ y << ext->get_param_float("yoffset");
+ a << (color & 0xff) / 255.0F;
+ r << ((color >> 24) & 0xff);
+ g << ((color >> 16) & 0xff);
+ b << ((color >> 8) & 0xff);
+
+ // Select object or user-defined color
+ if ((g_ascii_strcasecmp("innercut", type) == 0)) {
+ if (ext->get_param_bool("objcolor")) {
+ comp2in1 << "SourceGraphic";
+ comp2in2 << "offset";
+ } else {
+ comp2in1 << "offset";
+ comp2in2 << "SourceGraphic";
+ }
+ } else {
+ if (ext->get_param_bool("objcolor")) {
+ comp1in1 << "SourceGraphic";
+ comp1in2 << "flood";
+ } else {
+ comp1in1 << "flood";
+ comp1in2 << "SourceGraphic";
+ }
+ }
+
+ // Shadow mode
+ if ((g_ascii_strcasecmp("outer", type) == 0)) {
+ comp1op << "in";
+ comp2op << "over";
+ comp2in1 << "SourceGraphic";
+ comp2in2 << "offset";
+ } else if ((g_ascii_strcasecmp("inner", type) == 0)) {
+ comp1op << "out";
+ comp2op << "atop";
+ comp2in1 << "offset";
+ comp2in2 << "SourceGraphic";
+ } else if ((g_ascii_strcasecmp("outercut", type) == 0)) {
+ comp1op << "in";
+ comp2op << "out";
+ comp2in1 << "offset";
+ comp2in2 << "SourceGraphic";
+ } else if ((g_ascii_strcasecmp("innercut", type) == 0)){
+ comp1op << "out";
+ comp1in1 << "flood";
+ comp1in2 << "SourceGraphic";
+ comp2op << "in";
+ } else { //shadow
+ comp1op << "in";
+ comp2op << "atop";
+ comp2in1 << "offset";
+ comp2in2 << "offset";
+ }
+
+ // clang-format off
+ _filter = g_strdup_printf(
+ "<filter xmlns:inkscape=\"http://www.inkscape.org/namespaces/inkscape\" style=\"color-interpolation-filters:sRGB;\" inkscape:label=\"Drop Shadow\">\n"
+ "<feFlood flood-opacity=\"%s\" flood-color=\"rgb(%s,%s,%s)\" result=\"flood\" />\n"
+ "<feComposite in=\"%s\" in2=\"%s\" operator=\"%s\" result=\"composite1\" />\n"
+ "<feGaussianBlur in=\"composite1\" stdDeviation=\"%s\" result=\"blur\" />\n"
+ "<feOffset dx=\"%s\" dy=\"%s\" result=\"offset\" />\n"
+ "<feComposite in=\"%s\" in2=\"%s\" operator=\"%s\" result=\"composite2\" />\n"
+ "</filter>\n", a.str().c_str(), r.str().c_str(), g.str().c_str(), b.str().c_str(),
+ comp1in1.str().c_str(), comp1in2.str().c_str(), comp1op.str().c_str(),
+ blur.str().c_str(), x.str().c_str(), y.str().c_str(),
+ comp2in1.str().c_str(), comp2in2.str().c_str(), comp2op.str().c_str());
+ // clang-format on
+
+ return _filter;
+}; /* Drop shadow filter */
+
+}; /* namespace Filter */
+}; /* namespace Internal */
+}; /* namespace Extension */
+}; /* namespace Inkscape */
+
+/* Change the 'SHADOWS' below to be your file name */
+#endif /* SEEN_INKSCAPE_EXTENSION_INTERNAL_FILTER_SHADOWS_H__ */
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