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diff --git a/src/svg_color.cpp b/src/svg_color.cpp
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+++ b/src/svg_color.cpp
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2021 Jan Sebastian Götte <kicad@jaseg.de>
+ * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include "svg_color.h"
+
+#include <assert.h>
+#include <string>
+#include <cmath>
+
+using namespace svg_plugin;
+using namespace std;
+
+/* Map an SVG fill or stroke definition (color, but may also be a pattern) to a gerber color.
+ *
+ * This function handles transparency: Transparent SVG colors are mapped such that no gerber output is generated for
+ * them.
+ */
+enum gerber_color svg_plugin::svg_color_to_gerber(string color, string opacity, enum gerber_color default_val) {
+    float alpha = 1.0;
+    if (!opacity.empty() && opacity[0] != '\0') {
+        char *endptr = nullptr;
+        alpha = strtof(opacity.data(), &endptr);
+        assert(endptr);
+        assert(*endptr == '\0');
+    }
+
+    if (alpha < 0.5f) {
+        return GRB_NONE;
+    }
+
+    if (color.empty()) {
+        return default_val;
+    }
+
+    if (color == "none") {
+        return GRB_NONE;
+    }
+
+    if (color.rfind("url(#", 0) != string::npos) {
+        return GRB_PATTERN_FILL;
+    }
+
+    if (color.length() == 7 && color[0] == '#') {
+        HSVColor hsv(color);
+        if (hsv.v >= 0.5) {
+            return GRB_CLEAR;
+        }
+    }
+
+    return GRB_DARK;
+}
+
+svg_plugin::RGBColor::RGBColor(string hex) {
+    assert(hex[0] == '#');
+    char *endptr = nullptr;
+    const char *c = hex.data();
+    int rgb = strtol(c + 1, &endptr, 16);
+    assert(endptr);
+    assert(endptr == c + 7);
+    assert(*endptr == '\0');
+    r = ((rgb >> 16) & 0xff) / 255.0f;
+    g = ((rgb >>  8) & 0xff) / 255.0f;
+    b = ((rgb >>  0) & 0xff) / 255.0f;
+};
+
+svg_plugin::HSVColor::HSVColor(const RGBColor &color) {
+    float xmax = fmax(color.r, fmax(color.g, color.b));
+    float xmin = fmin(color.r, fmin(color.g, color.b));
+    float c = xmax - xmin;
+
+    v = xmax;
+
+    if (c == 0)
+        h = 0;
+    else if (v == color.r)
+        h = 1/3 * (0 + (color.g - color.b) / c);
+    else if (v == color.g)
+        h = 1/3 * (2 + (color.b - color.r) / c);
+    else //  v == color.b
+        h = 1/3 * (4 + (color.r - color.g) / c);
+
+    s = (v == 0) ? 0 : (c/v);
+}
+
+/* Invert gerber color */
+enum gerber_color svg_plugin::gerber_color_invert(enum gerber_color color) {
+    switch (color) {
+        case GRB_CLEAR: return GRB_DARK;
+        case GRB_DARK: return GRB_CLEAR;
+        default: return color; /* none, pattern */
+    }
+}
+
+/* Read node's fill attribute and convert it to a gerber color */
+enum gerber_color svg_plugin::gerber_fill_color(const pugi::xml_node &node) {
+    return svg_color_to_gerber(node.attribute("fill").value(), node.attribute("fill-opacity").value(), GRB_DARK);
+}
+
+/* Read node's stroke attribute and convert it to a gerber color */
+enum gerber_color svg_plugin::gerber_stroke_color(const pugi::xml_node &node) {
+    return svg_color_to_gerber(node.attribute("stroke").value(), node.attribute("stroke-opacity").value(), GRB_NONE);
+}
+
+