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diff --git a/src/cairo-filters.c b/src/cairo-filters.c
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+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Eric Anholt
+ * Copyright © 2009 Chris Wilson
+ * Copyright © 2005,2010 Red Hat, Inc
+ * Copyright © 2011 Linaro Limited
+ * Copyright © 2013 Samsung Research America, Silicon Valley
+ *
+ * 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 Red Hat, Inc.
+ *
+ * Contributor(s):
+ * Henry Song <henry.song@samsung.com>
+ */
+
+#include "cairoint.h"
+#include "cairo-filters-private.h"
+
+void
+compute_x_coef_to_float (double *matrix, int row, int col, float *coef)
+{
+ int i, j;
+
+ for (i = 0; i < col; i++) {
+ for (j = 0; j < row; j++)
+ coef[i] += matrix[i + j * col];
+ }
+}
+
+void
+compute_y_coef_to_float (double *matrix, int row, int col, float *coef)
+{
+ int i, j;
+
+ for (i = 0; i < row; i++) {
+ for (j = 0; j < col; j++)
+ coef[i] += matrix[i * col + j];
+ }
+}
+
+void
+compute_x_coef_to_double (double *matrix, int row, int col, double *coef)
+{
+ int i, j;
+
+ for (i = 0; i < col; i++) {
+ for (j = 0; j < row; j++)
+ coef[i] += matrix[i + j * col];
+ }
+}
+
+void
+compute_y_coef_to_double (double *matrix, int row, int col, double *coef)
+{
+ int i, j;
+
+ for (i = 0; i < row; i++) {
+ for (j = 0; j < col; j++)
+ coef[i] += matrix[i * col + j];
+ }
+}