c_pango_font_get_glyph_extents

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(PangoFont* font, PangoGlyph glyph, PangoRectangle* inkRect, PangoRectangle* logicalRect) c_pango_font_get_glyph_extents;

Meta