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.
Return: the scale factor of @matrix on the height of the font,
or 1.0 if @matrix is %NULL.
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.
Return: the scale factor of @matrix on the height of the font, or 1.0 if @matrix is %NULL.