Creates a cairo_scaled_font_t object from a font face and matrices that describe the size of the font and the environment in which it will be used. Since 1.0
font space to user space transformation matrix for the font. In the simplest case of a N point font, this matrix is just a scale by N, but it can also be used to shear the font or stretch it unequally along the two axes. See cairo_set_font_matrix().
user to device transformation matrix with which the font will be used.
options to use when getting metrics for the font and rendering with it.