read_fonts/generated/

generated_aat.rs

// THIS FILE IS AUTOGENERATED.
// Any changes to this file will be overwritten.
// For more information about how codegen works, see font-codegen/README.md

#[allow(unused_imports)]
use crate::codegen_prelude::*;

/// Lookup tables provide a way of looking up information about a glyph index.
/// The different cmap subtable formats.
#[derive(Clone)]
pub enum Lookup<'a> {
    Format0(Lookup0<'a>),
    Format2(Lookup2<'a>),
    Format4(Lookup4<'a>),
    Format6(Lookup6<'a>),
    Format8(Lookup8<'a>),
    Format10(Lookup10<'a>),
}

impl<'a> Lookup<'a> {
    ///Return the `FontData` used to resolve offsets for this table.
    pub fn offset_data(&self) -> FontData<'a> {
        match self {
            Self::Format0(item) => item.offset_data(),
            Self::Format2(item) => item.offset_data(),
            Self::Format4(item) => item.offset_data(),
            Self::Format6(item) => item.offset_data(),
            Self::Format8(item) => item.offset_data(),
            Self::Format10(item) => item.offset_data(),
        }
    }

    /// Format number is set to 0.
    pub fn format(&self) -> u16 {
        match self {
            Self::Format0(item) => item.format(),
            Self::Format2(item) => item.format(),
            Self::Format4(item) => item.format(),
            Self::Format6(item) => item.format(),
            Self::Format8(item) => item.format(),
            Self::Format10(item) => item.format(),
        }
    }
}

impl<'a> FontRead<'a> for Lookup<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let format: u16 = data.read_at(0usize)?;
        match format {
            Lookup0Marker::FORMAT => Ok(Self::Format0(FontRead::read(data)?)),
            Lookup2Marker::FORMAT => Ok(Self::Format2(FontRead::read(data)?)),
            Lookup4Marker::FORMAT => Ok(Self::Format4(FontRead::read(data)?)),
            Lookup6Marker::FORMAT => Ok(Self::Format6(FontRead::read(data)?)),
            Lookup8Marker::FORMAT => Ok(Self::Format8(FontRead::read(data)?)),
            Lookup10Marker::FORMAT => Ok(Self::Format10(FontRead::read(data)?)),
            other => Err(ReadError::InvalidFormat(other.into())),
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> Lookup<'a> {
    fn dyn_inner<'b>(&'b self) -> &'b dyn SomeTable<'a> {
        match self {
            Self::Format0(table) => table,
            Self::Format2(table) => table,
            Self::Format4(table) => table,
            Self::Format6(table) => table,
            Self::Format8(table) => table,
            Self::Format10(table) => table,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.dyn_inner().fmt(f)
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup<'a> {
    fn type_name(&self) -> &str {
        self.dyn_inner().type_name()
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        self.dyn_inner().get_field(idx)
    }
}

impl Format<u16> for Lookup0Marker {
    const FORMAT: u16 = 0;
}

/// Simple array format. The lookup data is an array of lookup values, indexed
/// by glyph index.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup0Marker {
    values_data_byte_len: usize,
}

impl Lookup0Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn values_data_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + self.values_data_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup0<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        let values_data_byte_len = cursor.remaining_bytes() / u8::RAW_BYTE_LEN * u8::RAW_BYTE_LEN;
        cursor.advance_by(values_data_byte_len);
        cursor.finish(Lookup0Marker {
            values_data_byte_len,
        })
    }
}

/// Simple array format. The lookup data is an array of lookup values, indexed
/// by glyph index.
pub type Lookup0<'a> = TableRef<'a, Lookup0Marker>;

impl<'a> Lookup0<'a> {
    /// Format number is set to 0.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Values, indexed by glyph index.
    pub fn values_data(&self) -> &'a [u8] {
        let range = self.shape.values_data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup0<'a> {
    fn type_name(&self) -> &str {
        "Lookup0"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("values_data", self.values_data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup0<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

impl Format<u16> for Lookup2Marker {
    const FORMAT: u16 = 2;
}

/// Segment single format. Each non-overlapping segment has a single lookup
/// value that applies to all glyphs in the segment. A segment is defined as
/// a contiguous range of glyph indexes.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup2Marker {
    segments_data_byte_len: usize,
}

impl Lookup2Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn unit_size_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn n_units_byte_range(&self) -> Range<usize> {
        let start = self.unit_size_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn search_range_byte_range(&self) -> Range<usize> {
        let start = self.n_units_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn entry_selector_byte_range(&self) -> Range<usize> {
        let start = self.search_range_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn range_shift_byte_range(&self) -> Range<usize> {
        let start = self.entry_selector_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn segments_data_byte_range(&self) -> Range<usize> {
        let start = self.range_shift_byte_range().end;
        start..start + self.segments_data_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup2<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        let unit_size: u16 = cursor.read()?;
        let n_units: u16 = cursor.read()?;
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let segments_data_byte_len = (transforms::add_multiply(unit_size, 0_usize, n_units))
            .checked_mul(u8::RAW_BYTE_LEN)
            .ok_or(ReadError::OutOfBounds)?;
        cursor.advance_by(segments_data_byte_len);
        cursor.finish(Lookup2Marker {
            segments_data_byte_len,
        })
    }
}

/// Segment single format. Each non-overlapping segment has a single lookup
/// value that applies to all glyphs in the segment. A segment is defined as
/// a contiguous range of glyph indexes.
pub type Lookup2<'a> = TableRef<'a, Lookup2Marker>;

impl<'a> Lookup2<'a> {
    /// Format number is set to 2.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Size of a lookup unit for this search in bytes.
    pub fn unit_size(&self) -> u16 {
        let range = self.shape.unit_size_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Number of units of the preceding size to be searched.
    pub fn n_units(&self) -> u16 {
        let range = self.shape.n_units_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the largest power of 2 that is less than or equal to the value of nUnits.
    pub fn search_range(&self) -> u16 {
        let range = self.shape.search_range_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The log base 2 of the largest power of 2 less than or equal to the value of nUnits.
    pub fn entry_selector(&self) -> u16 {
        let range = self.shape.entry_selector_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the difference of the value of nUnits minus the largest power of 2 less than or equal to the value of nUnits.
    pub fn range_shift(&self) -> u16 {
        let range = self.shape.range_shift_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Segments.
    pub fn segments_data(&self) -> &'a [u8] {
        let range = self.shape.segments_data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup2<'a> {
    fn type_name(&self) -> &str {
        "Lookup2"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("unit_size", self.unit_size())),
            2usize => Some(Field::new("n_units", self.n_units())),
            3usize => Some(Field::new("search_range", self.search_range())),
            4usize => Some(Field::new("entry_selector", self.entry_selector())),
            5usize => Some(Field::new("range_shift", self.range_shift())),
            6usize => Some(Field::new("segments_data", self.segments_data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup2<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

impl Format<u16> for Lookup4Marker {
    const FORMAT: u16 = 4;
}

/// Segment array format. A segment mapping is performed (as with Format 2),
/// but instead of a single lookup value for all the glyphs in the segment,
/// each glyph in the segment gets its own separate lookup value.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup4Marker {
    segments_byte_len: usize,
}

impl Lookup4Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn unit_size_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn n_units_byte_range(&self) -> Range<usize> {
        let start = self.unit_size_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn search_range_byte_range(&self) -> Range<usize> {
        let start = self.n_units_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn entry_selector_byte_range(&self) -> Range<usize> {
        let start = self.search_range_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn range_shift_byte_range(&self) -> Range<usize> {
        let start = self.entry_selector_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn segments_byte_range(&self) -> Range<usize> {
        let start = self.range_shift_byte_range().end;
        start..start + self.segments_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup4<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let n_units: u16 = cursor.read()?;
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let segments_byte_len = (n_units as usize)
            .checked_mul(LookupSegment4::RAW_BYTE_LEN)
            .ok_or(ReadError::OutOfBounds)?;
        cursor.advance_by(segments_byte_len);
        cursor.finish(Lookup4Marker { segments_byte_len })
    }
}

/// Segment array format. A segment mapping is performed (as with Format 2),
/// but instead of a single lookup value for all the glyphs in the segment,
/// each glyph in the segment gets its own separate lookup value.
pub type Lookup4<'a> = TableRef<'a, Lookup4Marker>;

impl<'a> Lookup4<'a> {
    /// Format number is set to 4.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Size of a lookup unit for this search in bytes.
    pub fn unit_size(&self) -> u16 {
        let range = self.shape.unit_size_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Number of units of the preceding size to be searched.
    pub fn n_units(&self) -> u16 {
        let range = self.shape.n_units_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the largest power of 2 that is less than or equal to the value of nUnits.
    pub fn search_range(&self) -> u16 {
        let range = self.shape.search_range_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The log base 2 of the largest power of 2 less than or equal to the value of nUnits.
    pub fn entry_selector(&self) -> u16 {
        let range = self.shape.entry_selector_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the difference of the value of nUnits minus the largest power of 2 less than or equal to the value of nUnits.
    pub fn range_shift(&self) -> u16 {
        let range = self.shape.range_shift_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Segments.
    pub fn segments(&self) -> &'a [LookupSegment4] {
        let range = self.shape.segments_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup4<'a> {
    fn type_name(&self) -> &str {
        "Lookup4"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("unit_size", self.unit_size())),
            2usize => Some(Field::new("n_units", self.n_units())),
            3usize => Some(Field::new("search_range", self.search_range())),
            4usize => Some(Field::new("entry_selector", self.entry_selector())),
            5usize => Some(Field::new("range_shift", self.range_shift())),
            6usize => Some(Field::new(
                "segments",
                traversal::FieldType::array_of_records(
                    stringify!(LookupSegment4),
                    self.segments(),
                    self.offset_data(),
                ),
            )),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup4<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Lookup segment for format 4.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Copy, bytemuck :: AnyBitPattern)]
#[repr(C)]
#[repr(packed)]
pub struct LookupSegment4 {
    /// Last glyph index in this segment.
    pub last_glyph: BigEndian<u16>,
    /// First glyph index in this segment.
    pub first_glyph: BigEndian<u16>,
    /// A 16-bit offset from the start of the table to the data.
    pub value_offset: BigEndian<u16>,
}

impl LookupSegment4 {
    /// Last glyph index in this segment.
    pub fn last_glyph(&self) -> u16 {
        self.last_glyph.get()
    }

    /// First glyph index in this segment.
    pub fn first_glyph(&self) -> u16 {
        self.first_glyph.get()
    }

    /// A 16-bit offset from the start of the table to the data.
    pub fn value_offset(&self) -> u16 {
        self.value_offset.get()
    }
}

impl FixedSize for LookupSegment4 {
    const RAW_BYTE_LEN: usize = u16::RAW_BYTE_LEN + u16::RAW_BYTE_LEN + u16::RAW_BYTE_LEN;
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeRecord<'a> for LookupSegment4 {
    fn traverse(self, data: FontData<'a>) -> RecordResolver<'a> {
        RecordResolver {
            name: "LookupSegment4",
            get_field: Box::new(move |idx, _data| match idx {
                0usize => Some(Field::new("last_glyph", self.last_glyph())),
                1usize => Some(Field::new("first_glyph", self.first_glyph())),
                2usize => Some(Field::new("value_offset", self.value_offset())),
                _ => None,
            }),
            data,
        }
    }
}

impl Format<u16> for Lookup6Marker {
    const FORMAT: u16 = 6;
}

/// Single table format. The lookup data is a sorted list of
/// <glyph index,lookup value> pairs.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup6Marker {
    entries_data_byte_len: usize,
}

impl Lookup6Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn unit_size_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn n_units_byte_range(&self) -> Range<usize> {
        let start = self.unit_size_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn search_range_byte_range(&self) -> Range<usize> {
        let start = self.n_units_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn entry_selector_byte_range(&self) -> Range<usize> {
        let start = self.search_range_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn range_shift_byte_range(&self) -> Range<usize> {
        let start = self.entry_selector_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn entries_data_byte_range(&self) -> Range<usize> {
        let start = self.range_shift_byte_range().end;
        start..start + self.entries_data_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup6<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        let unit_size: u16 = cursor.read()?;
        let n_units: u16 = cursor.read()?;
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let entries_data_byte_len = (transforms::add_multiply(unit_size, 0_usize, n_units))
            .checked_mul(u8::RAW_BYTE_LEN)
            .ok_or(ReadError::OutOfBounds)?;
        cursor.advance_by(entries_data_byte_len);
        cursor.finish(Lookup6Marker {
            entries_data_byte_len,
        })
    }
}

/// Single table format. The lookup data is a sorted list of
/// <glyph index,lookup value> pairs.
pub type Lookup6<'a> = TableRef<'a, Lookup6Marker>;

impl<'a> Lookup6<'a> {
    /// Format number is set to 6.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Size of a lookup unit for this search in bytes.
    pub fn unit_size(&self) -> u16 {
        let range = self.shape.unit_size_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Number of units of the preceding size to be searched.
    pub fn n_units(&self) -> u16 {
        let range = self.shape.n_units_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the largest power of 2 that is less than or equal to the value of nUnits.
    pub fn search_range(&self) -> u16 {
        let range = self.shape.search_range_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The log base 2 of the largest power of 2 less than or equal to the value of nUnits.
    pub fn entry_selector(&self) -> u16 {
        let range = self.shape.entry_selector_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The value of unitSize times the difference of the value of nUnits minus the largest power of 2 less than or equal to the value of nUnits.
    pub fn range_shift(&self) -> u16 {
        let range = self.shape.range_shift_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Values, indexed by glyph index.
    pub fn entries_data(&self) -> &'a [u8] {
        let range = self.shape.entries_data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup6<'a> {
    fn type_name(&self) -> &str {
        "Lookup6"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("unit_size", self.unit_size())),
            2usize => Some(Field::new("n_units", self.n_units())),
            3usize => Some(Field::new("search_range", self.search_range())),
            4usize => Some(Field::new("entry_selector", self.entry_selector())),
            5usize => Some(Field::new("range_shift", self.range_shift())),
            6usize => Some(Field::new("entries_data", self.entries_data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup6<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

impl Format<u16> for Lookup8Marker {
    const FORMAT: u16 = 8;
}

/// Trimmed array format. The lookup data is a simple trimmed array
/// indexed by glyph index.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup8Marker {
    value_array_byte_len: usize,
}

impl Lookup8Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn first_glyph_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn glyph_count_byte_range(&self) -> Range<usize> {
        let start = self.first_glyph_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn value_array_byte_range(&self) -> Range<usize> {
        let start = self.glyph_count_byte_range().end;
        start..start + self.value_array_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup8<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let value_array_byte_len = cursor.remaining_bytes() / u16::RAW_BYTE_LEN * u16::RAW_BYTE_LEN;
        cursor.advance_by(value_array_byte_len);
        cursor.finish(Lookup8Marker {
            value_array_byte_len,
        })
    }
}

/// Trimmed array format. The lookup data is a simple trimmed array
/// indexed by glyph index.
pub type Lookup8<'a> = TableRef<'a, Lookup8Marker>;

impl<'a> Lookup8<'a> {
    /// Format number is set to 8.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// First glyph index included in the trimmed array.
    pub fn first_glyph(&self) -> u16 {
        let range = self.shape.first_glyph_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Total number of glyphs (equivalent to the last glyph minus the value
    /// of firstGlyph plus 1).
    pub fn glyph_count(&self) -> u16 {
        let range = self.shape.glyph_count_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The lookup values (indexed by the glyph index minus the value of
    /// firstGlyph). Entries in the value array must be two bytes.
    pub fn value_array(&self) -> &'a [BigEndian<u16>] {
        let range = self.shape.value_array_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup8<'a> {
    fn type_name(&self) -> &str {
        "Lookup8"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("first_glyph", self.first_glyph())),
            2usize => Some(Field::new("glyph_count", self.glyph_count())),
            3usize => Some(Field::new("value_array", self.value_array())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup8<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

impl Format<u16> for Lookup10Marker {
    const FORMAT: u16 = 10;
}

/// Trimmed array format. The lookup data is a simple trimmed array
/// indexed by glyph index.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct Lookup10Marker {
    values_data_byte_len: usize,
}

impl Lookup10Marker {
    fn format_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn unit_size_byte_range(&self) -> Range<usize> {
        let start = self.format_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn first_glyph_byte_range(&self) -> Range<usize> {
        let start = self.unit_size_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn glyph_count_byte_range(&self) -> Range<usize> {
        let start = self.first_glyph_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn values_data_byte_range(&self) -> Range<usize> {
        let start = self.glyph_count_byte_range().end;
        start..start + self.values_data_byte_len
    }
}

impl<'a> FontRead<'a> for Lookup10<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        cursor.advance::<u16>();
        let values_data_byte_len = cursor.remaining_bytes() / u8::RAW_BYTE_LEN * u8::RAW_BYTE_LEN;
        cursor.advance_by(values_data_byte_len);
        cursor.finish(Lookup10Marker {
            values_data_byte_len,
        })
    }
}

/// Trimmed array format. The lookup data is a simple trimmed array
/// indexed by glyph index.
pub type Lookup10<'a> = TableRef<'a, Lookup10Marker>;

impl<'a> Lookup10<'a> {
    /// Format number is set to 10.
    pub fn format(&self) -> u16 {
        let range = self.shape.format_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Size of a lookup unit for this lookup table in bytes. Allowed values
    /// are 1, 2, 4, and 8.
    pub fn unit_size(&self) -> u16 {
        let range = self.shape.unit_size_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// First glyph index included in the trimmed array.
    pub fn first_glyph(&self) -> u16 {
        let range = self.shape.first_glyph_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Total number of glyphs (equivalent to the last glyph minus the value
    /// of firstGlyph plus 1).
    pub fn glyph_count(&self) -> u16 {
        let range = self.shape.glyph_count_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The lookup values (indexed by the glyph index minus the value of
    /// firstGlyph).
    pub fn values_data(&self) -> &'a [u8] {
        let range = self.shape.values_data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for Lookup10<'a> {
    fn type_name(&self) -> &str {
        "Lookup10"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("format", self.format())),
            1usize => Some(Field::new("unit_size", self.unit_size())),
            2usize => Some(Field::new("first_glyph", self.first_glyph())),
            3usize => Some(Field::new("glyph_count", self.glyph_count())),
            4usize => Some(Field::new("values_data", self.values_data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for Lookup10<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Header for a state table.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct StateHeaderMarker {}

impl StateHeaderMarker {
    fn state_size_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn class_table_offset_byte_range(&self) -> Range<usize> {
        let start = self.state_size_byte_range().end;
        start..start + Offset16::RAW_BYTE_LEN
    }
    fn state_array_offset_byte_range(&self) -> Range<usize> {
        let start = self.class_table_offset_byte_range().end;
        start..start + Offset16::RAW_BYTE_LEN
    }
    fn entry_table_offset_byte_range(&self) -> Range<usize> {
        let start = self.state_array_offset_byte_range().end;
        start..start + Offset16::RAW_BYTE_LEN
    }
}

impl<'a> FontRead<'a> for StateHeader<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        cursor.advance::<Offset16>();
        cursor.advance::<Offset16>();
        cursor.advance::<Offset16>();
        cursor.finish(StateHeaderMarker {})
    }
}

/// Header for a state table.
pub type StateHeader<'a> = TableRef<'a, StateHeaderMarker>;

impl<'a> StateHeader<'a> {
    /// Size of a state, in bytes. The size is limited to 8 bits, although the
    /// field is 16 bits for alignment.
    pub fn state_size(&self) -> u16 {
        let range = self.shape.state_size_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Byte offset from the beginning of the state table to the class subtable.
    pub fn class_table_offset(&self) -> Offset16 {
        let range = self.shape.class_table_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`class_table_offset`][Self::class_table_offset].
    pub fn class_table(&self) -> Result<ClassSubtable<'a>, ReadError> {
        let data = self.data;
        self.class_table_offset().resolve(data)
    }

    /// Byte offset from the beginning of the state table to the state array.
    pub fn state_array_offset(&self) -> Offset16 {
        let range = self.shape.state_array_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`state_array_offset`][Self::state_array_offset].
    pub fn state_array(&self) -> Result<RawBytes<'a>, ReadError> {
        let data = self.data;
        self.state_array_offset().resolve(data)
    }

    /// Byte offset from the beginning of the state table to the entry subtable.
    pub fn entry_table_offset(&self) -> Offset16 {
        let range = self.shape.entry_table_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`entry_table_offset`][Self::entry_table_offset].
    pub fn entry_table(&self) -> Result<RawBytes<'a>, ReadError> {
        let data = self.data;
        self.entry_table_offset().resolve(data)
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for StateHeader<'a> {
    fn type_name(&self) -> &str {
        "StateHeader"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("state_size", self.state_size())),
            1usize => Some(Field::new(
                "class_table_offset",
                FieldType::offset(self.class_table_offset(), self.class_table()),
            )),
            2usize => Some(Field::new(
                "state_array_offset",
                FieldType::offset(self.state_array_offset(), self.state_array()),
            )),
            3usize => Some(Field::new(
                "entry_table_offset",
                FieldType::offset(self.entry_table_offset(), self.entry_table()),
            )),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for StateHeader<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Maps the glyph indexes of your font into classes.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct ClassSubtableMarker {
    class_array_byte_len: usize,
}

impl ClassSubtableMarker {
    fn first_glyph_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u16::RAW_BYTE_LEN
    }
    fn n_glyphs_byte_range(&self) -> Range<usize> {
        let start = self.first_glyph_byte_range().end;
        start..start + u16::RAW_BYTE_LEN
    }
    fn class_array_byte_range(&self) -> Range<usize> {
        let start = self.n_glyphs_byte_range().end;
        start..start + self.class_array_byte_len
    }
}

impl<'a> FontRead<'a> for ClassSubtable<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u16>();
        let n_glyphs: u16 = cursor.read()?;
        let class_array_byte_len = (n_glyphs as usize)
            .checked_mul(u8::RAW_BYTE_LEN)
            .ok_or(ReadError::OutOfBounds)?;
        cursor.advance_by(class_array_byte_len);
        cursor.finish(ClassSubtableMarker {
            class_array_byte_len,
        })
    }
}

/// Maps the glyph indexes of your font into classes.
pub type ClassSubtable<'a> = TableRef<'a, ClassSubtableMarker>;

impl<'a> ClassSubtable<'a> {
    /// Glyph index of the first glyph in the class table.
    pub fn first_glyph(&self) -> u16 {
        let range = self.shape.first_glyph_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Number of glyphs in class table.
    pub fn n_glyphs(&self) -> u16 {
        let range = self.shape.n_glyphs_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// The class codes (indexed by glyph index minus firstGlyph). Class codes
    /// range from 0 to the value of stateSize minus 1.
    pub fn class_array(&self) -> &'a [u8] {
        let range = self.shape.class_array_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for ClassSubtable<'a> {
    fn type_name(&self) -> &str {
        "ClassSubtable"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("first_glyph", self.first_glyph())),
            1usize => Some(Field::new("n_glyphs", self.n_glyphs())),
            2usize => Some(Field::new("class_array", self.class_array())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for ClassSubtable<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Used for the `state_array` and `entry_table` fields in [`StateHeader`].
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct RawBytesMarker {
    data_byte_len: usize,
}

impl RawBytesMarker {
    fn data_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + self.data_byte_len
    }
}

impl<'a> FontRead<'a> for RawBytes<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        let data_byte_len = cursor.remaining_bytes() / u8::RAW_BYTE_LEN * u8::RAW_BYTE_LEN;
        cursor.advance_by(data_byte_len);
        cursor.finish(RawBytesMarker { data_byte_len })
    }
}

/// Used for the `state_array` and `entry_table` fields in [`StateHeader`].
pub type RawBytes<'a> = TableRef<'a, RawBytesMarker>;

impl<'a> RawBytes<'a> {
    pub fn data(&self) -> &'a [u8] {
        let range = self.shape.data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for RawBytes<'a> {
    fn type_name(&self) -> &str {
        "RawBytes"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("data", self.data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for RawBytes<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Header for an extended state table.
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct StxHeaderMarker {}

impl StxHeaderMarker {
    fn n_classes_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + u32::RAW_BYTE_LEN
    }
    fn class_table_offset_byte_range(&self) -> Range<usize> {
        let start = self.n_classes_byte_range().end;
        start..start + Offset32::RAW_BYTE_LEN
    }
    fn state_array_offset_byte_range(&self) -> Range<usize> {
        let start = self.class_table_offset_byte_range().end;
        start..start + Offset32::RAW_BYTE_LEN
    }
    fn entry_table_offset_byte_range(&self) -> Range<usize> {
        let start = self.state_array_offset_byte_range().end;
        start..start + Offset32::RAW_BYTE_LEN
    }
}

impl<'a> FontRead<'a> for StxHeader<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        cursor.advance::<u32>();
        cursor.advance::<Offset32>();
        cursor.advance::<Offset32>();
        cursor.advance::<Offset32>();
        cursor.finish(StxHeaderMarker {})
    }
}

/// Header for an extended state table.
pub type StxHeader<'a> = TableRef<'a, StxHeaderMarker>;

impl<'a> StxHeader<'a> {
    /// Number of classes, which is the number of 16-bit entry indices in a single line in the state array.
    pub fn n_classes(&self) -> u32 {
        let range = self.shape.n_classes_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Byte offset from the beginning of the state table to the class subtable.
    pub fn class_table_offset(&self) -> Offset32 {
        let range = self.shape.class_table_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`class_table_offset`][Self::class_table_offset].
    pub fn class_table(&self) -> Result<LookupU16<'a>, ReadError> {
        let data = self.data;
        self.class_table_offset().resolve(data)
    }

    /// Byte offset from the beginning of the state table to the state array.
    pub fn state_array_offset(&self) -> Offset32 {
        let range = self.shape.state_array_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`state_array_offset`][Self::state_array_offset].
    pub fn state_array(&self) -> Result<RawWords<'a>, ReadError> {
        let data = self.data;
        self.state_array_offset().resolve(data)
    }

    /// Byte offset from the beginning of the state table to the entry subtable.
    pub fn entry_table_offset(&self) -> Offset32 {
        let range = self.shape.entry_table_offset_byte_range();
        self.data.read_at(range.start).unwrap()
    }

    /// Attempt to resolve [`entry_table_offset`][Self::entry_table_offset].
    pub fn entry_table(&self) -> Result<RawBytes<'a>, ReadError> {
        let data = self.data;
        self.entry_table_offset().resolve(data)
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for StxHeader<'a> {
    fn type_name(&self) -> &str {
        "StxHeader"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("n_classes", self.n_classes())),
            1usize => Some(Field::new(
                "class_table_offset",
                FieldType::offset(self.class_table_offset(), self.class_table()),
            )),
            2usize => Some(Field::new(
                "state_array_offset",
                FieldType::offset(self.state_array_offset(), self.state_array()),
            )),
            3usize => Some(Field::new(
                "entry_table_offset",
                FieldType::offset(self.entry_table_offset(), self.entry_table()),
            )),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for StxHeader<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}

/// Used for the `state_array` in [`StxHeader`].
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct RawWordsMarker {
    data_byte_len: usize,
}

impl RawWordsMarker {
    fn data_byte_range(&self) -> Range<usize> {
        let start = 0;
        start..start + self.data_byte_len
    }
}

impl<'a> FontRead<'a> for RawWords<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let mut cursor = data.cursor();
        let data_byte_len = cursor.remaining_bytes() / u16::RAW_BYTE_LEN * u16::RAW_BYTE_LEN;
        cursor.advance_by(data_byte_len);
        cursor.finish(RawWordsMarker { data_byte_len })
    }
}

/// Used for the `state_array` in [`StxHeader`].
pub type RawWords<'a> = TableRef<'a, RawWordsMarker>;

impl<'a> RawWords<'a> {
    pub fn data(&self) -> &'a [BigEndian<u16>] {
        let range = self.shape.data_byte_range();
        self.data.read_array(range).unwrap()
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> SomeTable<'a> for RawWords<'a> {
    fn type_name(&self) -> &str {
        "RawWords"
    }
    fn get_field(&self, idx: usize) -> Option<Field<'a>> {
        match idx {
            0usize => Some(Field::new("data", self.data())),
            _ => None,
        }
    }
}

#[cfg(feature = "experimental_traverse")]
impl<'a> std::fmt::Debug for RawWords<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        (self as &dyn SomeTable<'a>).fmt(f)
    }
}