pango:matrix-scale (matrix sx sy)

matrix -- a pango:matrix instance
sx -- a number coerced to a double float for the amount to scale by in x direction
sy -- a number coerced to a double float for the amount to scale by in y direction

The pango:matrix instance with the transformation.

Changes the transformation represented by matrix to be the transformation given by first scaling by sx in the x direction and sy in the y direction then applying the original transformation.