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diff --git a/lib/art/art_uta.h b/lib/art/art_uta.h
new file mode 100644
index 0000000..943840f
--- /dev/null
+++ b/lib/art/art_uta.h
@@ -0,0 +1,72 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_H__
+#define __ART_UTA_H__
+
+/* Basic data structures and constructors for microtile arrays */
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include "art_misc.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef art_u32 ArtUtaBbox;
+typedef struct _ArtUta ArtUta;
+
+#define ART_UTA_BBOX_CONS(x0, y0, x1, y1) (((x0) << 24) | ((y0) << 16) | \
+				       ((x1) << 8) | (y1))
+
+#define ART_UTA_BBOX_X0(ub) ((ub) >> 24)
+#define ART_UTA_BBOX_Y0(ub) (((ub) >> 16) & 0xff)
+#define ART_UTA_BBOX_X1(ub) (((ub) >> 8) & 0xff)
+#define ART_UTA_BBOX_Y1(ub) ((ub) & 0xff)
+
+#define ART_UTILE_SHIFT 5
+#define ART_UTILE_SIZE (1 << ART_UTILE_SHIFT)
+
+/* Coordinates are shifted right by ART_UTILE_SHIFT wrt the real
+   coordinates. */
+struct _ArtUta {
+  int x0;
+  int y0;
+  int width;
+  int height;
+  ArtUtaBbox *utiles;
+};
+
+ArtUta *
+art_uta_new (int x0, int y0, int x1, int y1);
+
+ArtUta *
+art_uta_new_coords (int x0, int y0, int x1, int y1);
+
+void
+art_uta_free (ArtUta *uta);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_H__ */