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diff --git a/lib/art/art_rgba.h b/lib/art/art_rgba.h
new file mode 100644
index 0000000..77412e9
--- /dev/null
+++ b/lib/art/art_rgba.h
@@ -0,0 +1,49 @@
+/*
+ * art_rgba.h: Functions for manipulating RGBA pixel data.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 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_RGBA_H__
+#define __ART_RGBA_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include "art_misc.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_rgba_rgba_composite (art_u8 *dst, const art_u8 *src, int n);
+
+void
+art_rgba_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n);
+
+void
+art_rgba_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha, int n);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif