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use core::num::NonZeroU16;
use crate::{Tag, NormalizedCoord};
use crate::parser::{Stream, Offset16, Offset, LazyArray16, LazyArrayIter16, f32_bound};
use crate::raw::fvar as raw;
#[allow(missing_docs)]
#[repr(C)]
#[derive(Clone, Copy, PartialEq, Debug)]
pub struct VariationAxis {
pub tag: Tag,
pub min_value: f32,
pub def_value: f32,
pub max_value: f32,
pub name_id: u16,
pub hidden: bool,
}
impl VariationAxis {
pub(crate) fn normalized_value(&self, mut v: f32) -> NormalizedCoord {
v = f32_bound(self.min_value, v, self.max_value);
if v == self.def_value {
v = 0.0;
} else if v < self.def_value {
v = (v - self.def_value) / (self.def_value - self.min_value);
} else {
v = (v - self.def_value) / (self.max_value - self.def_value);
}
NormalizedCoord::from(v)
}
}
#[derive(Clone, Copy)]
pub(crate) struct Table<'a> {
axes: LazyArray16<'a, raw::VariationAxisRecord>,
}
impl<'a> Table<'a> {
pub fn parse(data: &'a [u8]) -> Option<Self> {
let mut s = Stream::new(data);
let version: u32 = s.read()?;
if version != 0x00010000 {
return None;
}
let axes_array_offset: Offset16 = s.read()?;
s.skip::<u16>();
let axis_count: u16 = s.read()?;
let axis_count = NonZeroU16::new(axis_count)?;
let mut s = Stream::new_at(data, axes_array_offset.to_usize())?;
let axes = s.read_array16(axis_count.get())?;
Some(Table { axes })
}
pub fn axes(&self) -> VariationAxes<'a> {
VariationAxes { iter: self.axes.into_iter() }
}
}
#[allow(missing_debug_implementations)]
#[derive(Clone, Copy, Default)]
pub struct VariationAxes<'a> {
iter: LazyArrayIter16<'a, raw::VariationAxisRecord>,
}
impl<'a> Iterator for VariationAxes<'a> {
type Item = VariationAxis;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
let record = self.iter.next()?;
let def_value = record.def_value();
let min_value = def_value.min(record.min_value());
let max_value = def_value.max(record.max_value());
Some(VariationAxis {
tag: record.axis_tag(),
min_value,
def_value,
max_value,
name_id: record.axis_name_id(),
hidden: (record.flags() >> 3) & 1 == 1,
})
}
#[inline]
fn count(self) -> usize {
self.iter.count()
}
}