use core::convert::TryFrom;
use crate::parser::{LazyArray16, Stream};
use crate::GlyphId;
#[derive(Clone, Copy, Debug)]
pub struct Subtable6<'a> {
pub first_code_point: u16,
pub glyphs: LazyArray16<'a, GlyphId>,
}
impl<'a> Subtable6<'a> {
pub fn parse(data: &'a [u8]) -> Option<Self> {
let mut s = Stream::new(data);
s.skip::<u16>(); s.skip::<u16>(); s.skip::<u16>(); let first_code_point = s.read::<u16>()?;
let count = s.read::<u16>()?;
let glyphs = s.read_array16::<GlyphId>(count)?;
Some(Self {
first_code_point,
glyphs,
})
}
pub fn glyph_index(&self, code_point: u32) -> Option<GlyphId> {
let code_point = u16::try_from(code_point).ok()?;
let idx = code_point.checked_sub(self.first_code_point)?;
self.glyphs.get(idx)
}
pub fn codepoints(&self, mut f: impl FnMut(u32)) {
for i in 0..self.glyphs.len() {
if let Some(code_point) = self.first_code_point.checked_add(i) {
f(u32::from(code_point));
}
}
}
}