pango:matrix-translate (matrix tx ty)

matrix -- a pango:matrix instance
tx -- a number coerced to a double float for the amount to translate in the x direction
ty -- a number coerced to a double float for the amount to translate in the y direction

The pango:matrix instance with the transformation.

Changes the transformation represented by matrix to be the transformation given by first translating by (tx,ty) then applying the original transformation.