gegl-buffer-matrix2
gboolean gegl_buffer_matrix2_is_identity (GeglBufferMatrix2 *matrix);
GeglBufferMatrix2 *matrix
gboolean gegl_buffer_matrix2_is_scale (GeglBufferMatrix2 *matrix);
gdouble gegl_buffer_matrix2_determinant (GeglBufferMatrix2 *matrix);
typedef struct { gdouble coeff[2][2]; } GeglBufferMatrix2;