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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmathtypes.h
+ *
+ * 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 3 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_MATH_TYPES_H__
+#define __GIMP_MATH_TYPES_H__
+
+
+#include <libgimpbase/gimpbasetypes.h>
+
+
+G_BEGIN_DECLS
+
+typedef struct _GimpMatrix2 GimpMatrix2;
+typedef struct _GimpMatrix3 GimpMatrix3;
+typedef struct _GimpMatrix4 GimpMatrix4;
+
+/**
+ * GimpMatrix2
+ * @coeff: the coefficients
+ *
+ * A two by two matrix.
+ **/
+struct _GimpMatrix2
+{
+  gdouble coeff[2][2];
+};
+
+/**
+ * GimpMatrix3
+ * @coeff: the coefficients
+ *
+ * A three by three matrix.
+ **/
+struct _GimpMatrix3
+{
+  gdouble coeff[3][3];
+};
+
+/**
+ * GimpMatrix4
+ * @coeff: the coefficients
+ *
+ * A four by four matrix.
+ **/
+struct _GimpMatrix4
+{
+  gdouble coeff[4][4];
+};
+
+
+typedef struct _GimpVector2 GimpVector2;
+typedef struct _GimpVector3 GimpVector3;
+typedef struct _GimpVector4 GimpVector4;
+
+/**
+ * GimpVector2:
+ * @x: the x axis
+ * @y: the y axis
+ *
+ * A two dimensional vector.
+ **/
+struct _GimpVector2
+{
+  gdouble x, y;
+};
+
+/**
+ * GimpVector3:
+ * @x: the x axis
+ * @y: the y axis
+ * @z: the z axis
+ *
+ * A three dimensional vector.
+ **/
+struct _GimpVector3
+{
+  gdouble x, y, z;
+};
+
+/**
+ * GimpVector4:
+ * @x: the x axis
+ * @y: the y axis
+ * @z: the z axis
+ * @w: the w axis
+ *
+ * A four dimensional vector.
+ **/
+struct _GimpVector4
+{
+  gdouble x, y, z, w;
+};
+
+
+G_END_DECLS
+
+#endif /* __GIMP_MATH_TYPES_H__ */