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//! OpenType variations common table formats

include!("../../generated/generated_variations.rs");

pub use read_fonts::tables::variations::TupleIndex;

impl VariationRegionList {
    fn compute_axis_count(&self) -> usize {
        let count = self
            .variation_regions
            .first()
            .map(|reg| reg.region_axes.len())
            .unwrap_or(0);
        //TODO: check this at validation time
        debug_assert!(self
            .variation_regions
            .iter()
            .map(|reg| reg.region_axes.len())
            .all(|n| n == count));
        count
    }
}

impl FontWrite for TupleIndex {
    fn write_into(&self, writer: &mut TableWriter) {
        self.bits().write_into(writer)
    }
}

//hack: unclear if we're even going to do any codegen for writing, but
//for the time being this lets us compile
impl<'a> FromObjRef<Option<read_fonts::tables::variations::Tuple<'a>>> for Vec<F2Dot14> {
    fn from_obj_ref(
        from: &Option<read_fonts::tables::variations::Tuple<'a>>,
        _data: FontData,
    ) -> Self {
        from.as_ref()
            .map(|tup| tup.values.iter().map(BigEndian::get).collect())
            .unwrap_or_default()
    }
}