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diff --git a/src/3rdparty/libdepixelize/priv/colorspace.h b/src/3rdparty/libdepixelize/priv/colorspace.h
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+/*  This file is part of the libdepixelize project
+    Copyright (C) 2013 Vinícius dos Santos Oliveira <vini.ipsmaker@gmail.com>
+
+    GNU Lesser General Public License Usage
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as published by the
+    Free Software Foundation; either version 2.1 of the License, or (at your
+    option) any later version.
+    You should have received a copy of the GNU Lesser General Public License
+    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+    GNU General Public License Usage
+    Alternatively, this library may be used 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.
+    You should have received a copy of the GNU General Public License along with
+    this library.  If not, see <http://www.gnu.org/licenses/>.
+
+    This library 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
+    Lesser General Public License for more details.
+*/
+
+#ifndef LIBDEPIXELIZE_TRACER_YUV_H
+#define LIBDEPIXELIZE_TRACER_YUV_H
+
+#include <glib.h>
+
+namespace Tracer {
+namespace colorspace {
+
+/**
+ * The same algorithm used in hqx filter
+ */
+inline void rgb2yuv(guint8 r, guint8 g, guint8 b,
+                    guint8 &y, guint8 &u, guint8 &v)
+{
+    y = 0.299 * r + 0.587 * g + 0.114 * b;
+    u = guint16(-0.169 * r - 0.331 * g + 0.5 * b) + 128;
+    v = guint16(0.5 * r - 0.419 * g - 0.081 * b) + 128;
+}
+
+inline void rgb2yuv(const guint8 rgb[], guint8 yuv[])
+{
+    rgb2yuv(rgb[0], rgb[1], rgb[2], yuv[0], yuv[1], yuv[2]);
+}
+
+inline bool same_color(const guint8 (&a)[4], const guint8 (&b)[4])
+{
+    return (a[0] == b[0]
+            && a[1] == b[1]
+            && a[2] == b[2]
+            && a[3] == b[3]);
+}
+
+inline bool dissimilar_colors(const guint8 a[], const guint8 b[])
+{
+    // C uses row-major order, so 
+    // A[2][3] = { {1, 2, 3}, {4, 5, 6} } = {1, 2, 3, 4, 5, 6}
+    guint8 yuv[2][3];
+    rgb2yuv(a, yuv[0]);
+    rgb2yuv(b, yuv[1]);
+
+    // Magic numbers taken from hqx algorithm
+    // Only used to describe the level of tolerance
+    return abs(yuv[0][0] - yuv[1][0]) > 0x30
+        || abs(yuv[0][1] - yuv[1][1]) > 7
+        || abs(yuv[0][2] - yuv[1][2]) > 6;
+}
+
+inline bool similar_colors(const guint8 a[], const guint8 b[])
+{
+    return !dissimilar_colors(a, b);
+}
+
+inline bool shading_edge(const guint8 a[], const guint8 b[])
+{
+    // C uses row-major order, so 
+    // A[2][3] = { {1, 2, 3}, {4, 5, 6} } = {1, 2, 3, 4, 5, 6}
+    guint8 yuv[2][3];
+    rgb2yuv(a, yuv[0]);
+    rgb2yuv(b, yuv[1]);
+
+    // Magic numbers taken from Kopf-Lischinski algorithm
+    // Only used to describe the level of tolerance
+    return abs(yuv[0][0] - yuv[1][0]) <= 100
+        && abs(yuv[0][1] - yuv[1][1]) <= 100
+        && abs(yuv[0][2] - yuv[1][2]) <= 100;
+}
+
+inline bool contour_edge(const guint8 a[], const guint8 b[])
+{
+    return !shading_edge(a, b);
+}
+
+} // namespace colorspace
+} // namespace Tracer
+
+#endif // LIBDEPIXELIZE_TRACER_YUV_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:encoding=utf-8:textwidth=99 :