a and b together
and stores the result in result. The effect of the resulting
transformation is to first apply the transformation in a to the
coordinates and then apply the transformation in b to the
coordinates.cairoMatrixMultiply(result, a, b)resultCairoMatrix] a cairo.matrix.t in which to store the resultaCairoMatrix] a cairo.matrix.tbCairoMatrix] a cairo.matrix.tresult to be identical to either a or b.