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diff --git a/libs/cairo-1.16.0/src/cairo-slope-private.h b/libs/cairo-1.16.0/src/cairo-slope-private.h
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+++ b/libs/cairo-1.16.0/src/cairo-slope-private.h
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+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2002 University of Southern California
+ * Copyright © 2005 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is University of Southern
+ * California.
+ *
+ * Contributor(s):
+ *	Carl D. Worth <cworth@cworth.org>
+ */
+
+#ifndef _CAIRO_SLOPE_PRIVATE_H
+#define _CAIRO_SLOPE_PRIVATE_H
+
+#include "cairo-types-private.h"
+#include "cairo-fixed-private.h"
+
+static inline void
+_cairo_slope_init (cairo_slope_t *slope,
+		   const cairo_point_t *a,
+		   const cairo_point_t *b)
+{
+    slope->dx = b->x - a->x;
+    slope->dy = b->y - a->y;
+}
+
+static inline cairo_bool_t
+_cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b)
+{
+    return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx),
+			    _cairo_int32x32_64_mul (b->dy, a->dx));
+}
+
+static inline cairo_bool_t
+_cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b)
+{
+    return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx),
+						    _cairo_int32x32_64_mul (a->dy, b->dy)));
+}
+
+cairo_private int
+_cairo_slope_compare (const cairo_slope_t *a,
+	              const cairo_slope_t *b) cairo_pure;
+
+
+#endif /* _CAIRO_SLOPE_PRIVATE_H */