Fetches the extents for a font in a text segment of the specified direction.
Calls the appropriate direction-specific variant (horizontal or vertical) depending on the value of direction.
#hb_font_t to work upon
The direction of the text segment
The #hb_font_extents_t retrieved
Fetches the extents for a font in a text segment of the specified direction.
Calls the appropriate direction-specific variant (horizontal or vertical) depending on the value of direction.