getFontScaleFactor
Returns the scale factor of a matrix on the height of the font.
That is, the scale factor in the direction perpendicular to the vector that the X coordinate is mapped to. If the scale in the X coordinate is needed as well, use method@Pango.Matrix.get_font_scale_factors.
Return
the scale factor of @matrix on the height of the font, or 1.0 if @matrix is null.
Since
1.12