1 files changed, 118 insertions, 0 deletions
diff --git a/src/matrix.h b/src/matrix.h
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * matrix.h
+ * Copyright (C) 1998 Jay Cox <jaycox@earthlink.net>
+ *
+ * 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 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
+ * 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, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __MATRIX_H__
+#define __MATRIX_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+typedef struct _Matrix2 Matrix2;
+typedef struct _Matrix3 Matrix3;
+typedef struct _Matrix4 Matrix4;
+typedef struct _Vector3 Vector3;
+
+struct _Matrix2
+{
+    gdouble coeff[2][2];
+};
+
+struct _Matrix3
+{
+    gdouble coeff[3][3];
+};
+
+struct _Matrix4
+{
+    gdouble coeff[4][4];
+};
+
+struct _Vector3
+{
+    gdouble coeff[3];
+};
+
+
+void     matrix2_identity        (Matrix2       *matrix);
+void     matrix2_mult            (const Matrix2 *matrix1,
+				  Matrix2       *matrix2);
+
+void matrix3_transpose (Matrix3 *matrix);
+
+void     matrix3_identity        (Matrix3       *matrix);
+void     matrix3_mult            (const Matrix3 *matrix1,
+				  Matrix3       *matrix2);
+void     matrix3_translate       (Matrix3       *matrix,
+				  gdouble        x,
+				  gdouble        y);
+void     matrix3_scale           (Matrix3       *matrix,
+				  gdouble        x,
+				  gdouble        y);
+void     matrix3_rotate          (Matrix3       *matrix,
+				  gdouble        theta);
+void     matrix3_xshear          (Matrix3       *matrix,
+				  gdouble        amount);
+void     matrix3_yshear          (Matrix3       *matrix,
+				  gdouble        amount);
+void     matrix3_affine          (Matrix3       *matrix,
+				  gdouble        a,
+				  gdouble        b,
+				  gdouble        c,
+				  gdouble        d,
+				  gdouble        e,
+				  gdouble        f);
+gdouble  matrix3_determinant     (const Matrix3 *matrix);
+gboolean matrix3_invert          (Matrix3       *matrix);
+gboolean matrix3_is_diagonal     (const Matrix3 *matrix);
+gboolean matrix3_is_identity     (const Matrix3 *matrix);
+gboolean matrix3_is_simple       (const Matrix3 *matrix);
+void     matrix3_multiply_vector (const Matrix3 *A,
+				  const Vector3 *x,
+				  Vector3	*result);
+void     matrix3_transform_point (const Matrix3 *matrix,
+				  gdouble        x,
+				  gdouble        y,
+				  gdouble       *newx,
+				  gdouble       *newy);
+
+void     matrix4_to_deg          (const Matrix4 *matrix,
+				  gdouble       *a,
+				  gdouble       *b,
+				  gdouble       *c);
+void    transform_matrix_perspective (gint         x1,
+				      gint         y1,
+				      gint         x2,
+				      gint         y2,
+				      gdouble      tx1,
+				      gdouble      ty1,
+				      gdouble      tx2,
+				      gdouble      ty2,
+				      gdouble      tx3,
+				      gdouble      ty3,
+				      gdouble      tx4,
+				      gdouble      ty4,
+				      Matrix3 *result);
+
+G_END_DECLS
+
+#endif /* __MATRIX_H__ */