func fontSetSubtypeID(f *C.cairo_font_face_t, s subtypeID) {
if fontType(C.cairo_font_face_get_type(f)) != FontTypeUser {
panic("font is not a user font")
}
if C.cairo_font_face_get_user_data(f, stkey) != nil {
panic("font already has subtype set")
}
C.cairo_font_face_set_user_data(f, stkey, s.c(), free)
}
func fontGetSubtypeID(f *C.cairo_font_face_t) subtypeID {
if fontType(C.cairo_font_face_get_type(f)) != FontTypeUser {
panic("font is not a user font")
}
p := C.cairo_font_face_get_user_data(f, stkey)
if p == nil {
panic("no subtype set: font not registered")
}
return subtypeID(ctoint(p))
}
func cFont(f *C.cairo_font_face_t) (Font, error) {
t := fontType(C.cairo_font_face_get_type(f))
fac, ok := cfonttogofont[t]
if !ok {
panic("No C → Go font converter registered for " + t.String())
}
F, err := fac(f)
if err != nil {
return nil, err
}
err = F.Err()
if err != nil {
return nil, err
}
return F, nil
}
//Type reports the type of the font.
//
//Originally cairo_font_face_get_type.
func (f *XtensionFont) Type() fontType {
return fontType(C.cairo_font_face_get_type(f.f))
}
