write_fonts/generated/

generated_gpos.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::*;

pub use read_fonts::tables::gpos::ValueFormat;

/// [Class Definition Table Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/chapter2#class-definition-table-format-1)
/// [GPOS Version 1.0](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#gpos-header)
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Gpos {
    /// Offset to ScriptList table, from beginning of GPOS table
    pub script_list: OffsetMarker<ScriptList>,
    /// Offset to FeatureList table, from beginning of GPOS table
    pub feature_list: OffsetMarker<FeatureList>,
    /// Offset to LookupList table, from beginning of GPOS table
    pub lookup_list: OffsetMarker<PositionLookupList>,
    pub feature_variations: NullableOffsetMarker<FeatureVariations, WIDTH_32>,
}

impl Gpos {
    /// Construct a new `Gpos`
    pub fn new(
        script_list: ScriptList,
        feature_list: FeatureList,
        lookup_list: PositionLookupList,
    ) -> Self {
        Self {
            script_list: script_list.into(),
            feature_list: feature_list.into(),
            lookup_list: lookup_list.into(),
            ..Default::default()
        }
    }
}

impl FontWrite for Gpos {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        let version = self.compute_version() as MajorMinor;
        version.write_into(writer);
        self.script_list.write_into(writer);
        self.feature_list.write_into(writer);
        self.lookup_list.write_into(writer);
        version
            .compatible((1u16, 1u16))
            .then(|| self.feature_variations.write_into(writer));
    }
    fn table_type(&self) -> TableType {
        TableType::TopLevel(Gpos::TAG)
    }
}

impl Validate for Gpos {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("Gpos", |ctx| {
            ctx.in_field("script_list", |ctx| {
                self.script_list.validate_impl(ctx);
            });
            ctx.in_field("feature_list", |ctx| {
                self.feature_list.validate_impl(ctx);
            });
            ctx.in_field("lookup_list", |ctx| {
                self.lookup_list.validate_impl(ctx);
            });
            ctx.in_field("feature_variations", |ctx| {
                self.feature_variations.validate_impl(ctx);
            });
        })
    }
}

impl TopLevelTable for Gpos {
    const TAG: Tag = Tag::new(b"GPOS");
}

impl<'a> FromObjRef<read_fonts::tables::gpos::Gpos<'a>> for Gpos {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::Gpos<'a>, _: FontData) -> Self {
        Gpos {
            script_list: obj.script_list().to_owned_table(),
            feature_list: obj.feature_list().to_owned_table(),
            lookup_list: obj.lookup_list().to_owned_table(),
            feature_variations: obj.feature_variations().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::Gpos<'a>> for Gpos {}

impl ReadArgs for Gpos {
    type Args = ();
}

impl<'a> FontRead<'a> for Gpos {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::Gpos as FontRead>::read(data).map(|x| x.to_owned_table())
    }
}

/// A [GPOS Lookup](https://learn.microsoft.com/en-us/typography/opentype/spec/gpos#gsubLookupTypeEnum) subtable.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum PositionLookup {
    Single(Lookup<SinglePos>),
    Pair(Lookup<PairPos>),
    Cursive(Lookup<CursivePosFormat1>),
    MarkToBase(Lookup<MarkBasePosFormat1>),
    MarkToLig(Lookup<MarkLigPosFormat1>),
    MarkToMark(Lookup<MarkMarkPosFormat1>),
    Contextual(Lookup<PositionSequenceContext>),
    ChainContextual(Lookup<PositionChainContext>),
    Extension(Lookup<ExtensionSubtable>),
}

impl Default for PositionLookup {
    fn default() -> Self {
        Self::Single(Default::default())
    }
}

impl FontWrite for PositionLookup {
    fn write_into(&self, writer: &mut TableWriter) {
        match self {
            Self::Single(table) => table.write_into(writer),
            Self::Pair(table) => table.write_into(writer),
            Self::Cursive(table) => table.write_into(writer),
            Self::MarkToBase(table) => table.write_into(writer),
            Self::MarkToLig(table) => table.write_into(writer),
            Self::MarkToMark(table) => table.write_into(writer),
            Self::Contextual(table) => table.write_into(writer),
            Self::ChainContextual(table) => table.write_into(writer),
            Self::Extension(table) => table.write_into(writer),
        }
    }
    fn table_type(&self) -> TableType {
        match self {
            Self::Single(table) => table.table_type(),
            Self::Pair(table) => table.table_type(),
            Self::Cursive(table) => table.table_type(),
            Self::MarkToBase(table) => table.table_type(),
            Self::MarkToLig(table) => table.table_type(),
            Self::MarkToMark(table) => table.table_type(),
            Self::Contextual(table) => table.table_type(),
            Self::ChainContextual(table) => table.table_type(),
            Self::Extension(table) => table.table_type(),
        }
    }
}

impl Validate for PositionLookup {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        match self {
            Self::Single(table) => table.validate_impl(ctx),
            Self::Pair(table) => table.validate_impl(ctx),
            Self::Cursive(table) => table.validate_impl(ctx),
            Self::MarkToBase(table) => table.validate_impl(ctx),
            Self::MarkToLig(table) => table.validate_impl(ctx),
            Self::MarkToMark(table) => table.validate_impl(ctx),
            Self::Contextual(table) => table.validate_impl(ctx),
            Self::ChainContextual(table) => table.validate_impl(ctx),
            Self::Extension(table) => table.validate_impl(ctx),
        }
    }
}

impl FromObjRef<read_fonts::tables::gpos::PositionLookup<'_>> for PositionLookup {
    fn from_obj_ref(from: &read_fonts::tables::gpos::PositionLookup<'_>, data: FontData) -> Self {
        match from {
            read_fonts::tables::gpos::PositionLookup::Single(table) => {
                Self::Single(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::Pair(table) => {
                Self::Pair(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::Cursive(table) => {
                Self::Cursive(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::MarkToBase(table) => {
                Self::MarkToBase(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::MarkToLig(table) => {
                Self::MarkToLig(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::MarkToMark(table) => {
                Self::MarkToMark(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::Contextual(table) => {
                Self::Contextual(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::ChainContextual(table) => {
                Self::ChainContextual(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::PositionLookup::Extension(table) => {
                Self::Extension(table.to_owned_obj(data))
            }
        }
    }
}

impl FromTableRef<read_fonts::tables::gpos::PositionLookup<'_>> for PositionLookup {}

impl From<Lookup<SinglePos>> for PositionLookup {
    fn from(src: Lookup<SinglePos>) -> PositionLookup {
        PositionLookup::Single(src)
    }
}

impl From<Lookup<PairPos>> for PositionLookup {
    fn from(src: Lookup<PairPos>) -> PositionLookup {
        PositionLookup::Pair(src)
    }
}

impl From<Lookup<CursivePosFormat1>> for PositionLookup {
    fn from(src: Lookup<CursivePosFormat1>) -> PositionLookup {
        PositionLookup::Cursive(src)
    }
}

impl From<Lookup<MarkBasePosFormat1>> for PositionLookup {
    fn from(src: Lookup<MarkBasePosFormat1>) -> PositionLookup {
        PositionLookup::MarkToBase(src)
    }
}

impl From<Lookup<MarkLigPosFormat1>> for PositionLookup {
    fn from(src: Lookup<MarkLigPosFormat1>) -> PositionLookup {
        PositionLookup::MarkToLig(src)
    }
}

impl From<Lookup<MarkMarkPosFormat1>> for PositionLookup {
    fn from(src: Lookup<MarkMarkPosFormat1>) -> PositionLookup {
        PositionLookup::MarkToMark(src)
    }
}

impl From<Lookup<PositionSequenceContext>> for PositionLookup {
    fn from(src: Lookup<PositionSequenceContext>) -> PositionLookup {
        PositionLookup::Contextual(src)
    }
}

impl From<Lookup<PositionChainContext>> for PositionLookup {
    fn from(src: Lookup<PositionChainContext>) -> PositionLookup {
        PositionLookup::ChainContextual(src)
    }
}

impl From<Lookup<ExtensionSubtable>> for PositionLookup {
    fn from(src: Lookup<ExtensionSubtable>) -> PositionLookup {
        PositionLookup::Extension(src)
    }
}

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

/// [Anchor Tables](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#anchor-tables)
/// position one glyph with respect to another.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum AnchorTable {
    Format1(AnchorFormat1),
    Format2(AnchorFormat2),
    Format3(AnchorFormat3),
}

impl AnchorTable {
    /// Construct a new `AnchorFormat1` subtable
    pub fn format_1(x_coordinate: i16, y_coordinate: i16) -> Self {
        Self::Format1(AnchorFormat1::new(x_coordinate, y_coordinate))
    }

    /// Construct a new `AnchorFormat2` subtable
    pub fn format_2(x_coordinate: i16, y_coordinate: i16, anchor_point: u16) -> Self {
        Self::Format2(AnchorFormat2::new(x_coordinate, y_coordinate, anchor_point))
    }

    /// Construct a new `AnchorFormat3` subtable
    pub fn format_3(
        x_coordinate: i16,
        y_coordinate: i16,
        x_device: Option<DeviceOrVariationIndex>,
        y_device: Option<DeviceOrVariationIndex>,
    ) -> Self {
        Self::Format3(AnchorFormat3::new(
            x_coordinate,
            y_coordinate,
            x_device,
            y_device,
        ))
    }
}

impl Default for AnchorTable {
    fn default() -> Self {
        Self::Format1(Default::default())
    }
}

impl FontWrite for AnchorTable {
    fn write_into(&self, writer: &mut TableWriter) {
        match self {
            Self::Format1(item) => item.write_into(writer),
            Self::Format2(item) => item.write_into(writer),
            Self::Format3(item) => item.write_into(writer),
        }
    }
    fn table_type(&self) -> TableType {
        match self {
            Self::Format1(item) => item.table_type(),
            Self::Format2(item) => item.table_type(),
            Self::Format3(item) => item.table_type(),
        }
    }
}

impl Validate for AnchorTable {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        match self {
            Self::Format1(item) => item.validate_impl(ctx),
            Self::Format2(item) => item.validate_impl(ctx),
            Self::Format3(item) => item.validate_impl(ctx),
        }
    }
}

impl FromObjRef<read_fonts::tables::gpos::AnchorTable<'_>> for AnchorTable {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::AnchorTable, _: FontData) -> Self {
        use read_fonts::tables::gpos::AnchorTable as ObjRefType;
        match obj {
            ObjRefType::Format1(item) => AnchorTable::Format1(item.to_owned_table()),
            ObjRefType::Format2(item) => AnchorTable::Format2(item.to_owned_table()),
            ObjRefType::Format3(item) => AnchorTable::Format3(item.to_owned_table()),
        }
    }
}

impl FromTableRef<read_fonts::tables::gpos::AnchorTable<'_>> for AnchorTable {}

impl ReadArgs for AnchorTable {
    type Args = ();
}

impl<'a> FontRead<'a> for AnchorTable {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::AnchorTable as FontRead>::read(data).map(|x| x.to_owned_table())
    }
}

impl From<AnchorFormat1> for AnchorTable {
    fn from(src: AnchorFormat1) -> AnchorTable {
        AnchorTable::Format1(src)
    }
}

impl From<AnchorFormat2> for AnchorTable {
    fn from(src: AnchorFormat2) -> AnchorTable {
        AnchorTable::Format2(src)
    }
}

impl From<AnchorFormat3> for AnchorTable {
    fn from(src: AnchorFormat3) -> AnchorTable {
        AnchorTable::Format3(src)
    }
}

/// [Anchor Table Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#anchor-table-format-1-design-units): Design Units
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct AnchorFormat1 {
    /// Horizontal value, in design units
    pub x_coordinate: i16,
    /// Vertical value, in design units
    pub y_coordinate: i16,
}

impl AnchorFormat1 {
    /// Construct a new `AnchorFormat1`
    pub fn new(x_coordinate: i16, y_coordinate: i16) -> Self {
        Self {
            x_coordinate,
            y_coordinate,
        }
    }
}

impl FontWrite for AnchorFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.x_coordinate.write_into(writer);
        self.y_coordinate.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("AnchorFormat1")
    }
}

impl Validate for AnchorFormat1 {
    fn validate_impl(&self, _ctx: &mut ValidationCtx) {}
}

impl<'a> FromObjRef<read_fonts::tables::gpos::AnchorFormat1<'a>> for AnchorFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::AnchorFormat1<'a>, _: FontData) -> Self {
        AnchorFormat1 {
            x_coordinate: obj.x_coordinate(),
            y_coordinate: obj.y_coordinate(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::AnchorFormat1<'a>> for AnchorFormat1 {}

impl ReadArgs for AnchorFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for AnchorFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::AnchorFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// [Anchor Table Format 2](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#anchor-table-format-2-design-units-plus-contour-point): Design Units Plus Contour Point
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct AnchorFormat2 {
    /// Horizontal value, in design units
    pub x_coordinate: i16,
    /// Vertical value, in design units
    pub y_coordinate: i16,
    /// Index to glyph contour point
    pub anchor_point: u16,
}

impl AnchorFormat2 {
    /// Construct a new `AnchorFormat2`
    pub fn new(x_coordinate: i16, y_coordinate: i16, anchor_point: u16) -> Self {
        Self {
            x_coordinate,
            y_coordinate,
            anchor_point,
        }
    }
}

impl FontWrite for AnchorFormat2 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (2 as u16).write_into(writer);
        self.x_coordinate.write_into(writer);
        self.y_coordinate.write_into(writer);
        self.anchor_point.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("AnchorFormat2")
    }
}

impl Validate for AnchorFormat2 {
    fn validate_impl(&self, _ctx: &mut ValidationCtx) {}
}

impl<'a> FromObjRef<read_fonts::tables::gpos::AnchorFormat2<'a>> for AnchorFormat2 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::AnchorFormat2<'a>, _: FontData) -> Self {
        AnchorFormat2 {
            x_coordinate: obj.x_coordinate(),
            y_coordinate: obj.y_coordinate(),
            anchor_point: obj.anchor_point(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::AnchorFormat2<'a>> for AnchorFormat2 {}

impl ReadArgs for AnchorFormat2 {
    type Args = ();
}

impl<'a> FontRead<'a> for AnchorFormat2 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::AnchorFormat2 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// [Anchor Table Format 3](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#anchor-table-format-3-design-units-plus-device-or-variationindex-tables): Design Units Plus Device or VariationIndex Tables
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct AnchorFormat3 {
    /// Horizontal value, in design units
    pub x_coordinate: i16,
    /// Vertical value, in design units
    pub y_coordinate: i16,
    /// Offset to Device table (non-variable font) / VariationIndex
    /// table (variable font) for X coordinate, from beginning of
    /// Anchor table (may be NULL)
    pub x_device: NullableOffsetMarker<DeviceOrVariationIndex>,
    /// Offset to Device table (non-variable font) / VariationIndex
    /// table (variable font) for Y coordinate, from beginning of
    /// Anchor table (may be NULL)
    pub y_device: NullableOffsetMarker<DeviceOrVariationIndex>,
}

impl AnchorFormat3 {
    /// Construct a new `AnchorFormat3`
    pub fn new(
        x_coordinate: i16,
        y_coordinate: i16,
        x_device: Option<DeviceOrVariationIndex>,
        y_device: Option<DeviceOrVariationIndex>,
    ) -> Self {
        Self {
            x_coordinate,
            y_coordinate,
            x_device: x_device.into(),
            y_device: y_device.into(),
        }
    }
}

impl FontWrite for AnchorFormat3 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (3 as u16).write_into(writer);
        self.x_coordinate.write_into(writer);
        self.y_coordinate.write_into(writer);
        self.x_device.write_into(writer);
        self.y_device.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("AnchorFormat3")
    }
}

impl Validate for AnchorFormat3 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("AnchorFormat3", |ctx| {
            ctx.in_field("x_device", |ctx| {
                self.x_device.validate_impl(ctx);
            });
            ctx.in_field("y_device", |ctx| {
                self.y_device.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::AnchorFormat3<'a>> for AnchorFormat3 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::AnchorFormat3<'a>, _: FontData) -> Self {
        AnchorFormat3 {
            x_coordinate: obj.x_coordinate(),
            y_coordinate: obj.y_coordinate(),
            x_device: obj.x_device().to_owned_table(),
            y_device: obj.y_device().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::AnchorFormat3<'a>> for AnchorFormat3 {}

impl ReadArgs for AnchorFormat3 {
    type Args = ();
}

impl<'a> FontRead<'a> for AnchorFormat3 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::AnchorFormat3 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// [Mark Array Table](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#mark-array-table)
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct MarkArray {
    /// Array of MarkRecords, ordered by corresponding glyphs in the
    /// associated mark Coverage table.
    pub mark_records: Vec<MarkRecord>,
}

impl MarkArray {
    /// Construct a new `MarkArray`
    pub fn new(mark_records: Vec<MarkRecord>) -> Self {
        Self { mark_records }
    }
}

impl FontWrite for MarkArray {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.mark_records)).unwrap()).write_into(writer);
        self.mark_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("MarkArray")
    }
}

impl Validate for MarkArray {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("MarkArray", |ctx| {
            ctx.in_field("mark_records", |ctx| {
                if self.mark_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.mark_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::MarkArray<'a>> for MarkArray {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::MarkArray<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        MarkArray {
            mark_records: obj.mark_records().to_owned_obj(offset_data),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::MarkArray<'a>> for MarkArray {}

impl ReadArgs for MarkArray {
    type Args = ();
}

impl<'a> FontRead<'a> for MarkArray {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::MarkArray as FontRead>::read(data).map(|x| x.to_owned_table())
    }
}

/// Part of [MarkArray]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct MarkRecord {
    /// Class defined for the associated mark.
    pub mark_class: u16,
    /// Offset to Anchor table, from beginning of MarkArray table.
    pub mark_anchor: OffsetMarker<AnchorTable>,
}

impl MarkRecord {
    /// Construct a new `MarkRecord`
    pub fn new(mark_class: u16, mark_anchor: AnchorTable) -> Self {
        Self {
            mark_class,
            mark_anchor: mark_anchor.into(),
        }
    }
}

impl FontWrite for MarkRecord {
    fn write_into(&self, writer: &mut TableWriter) {
        self.mark_class.write_into(writer);
        self.mark_anchor.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("MarkRecord")
    }
}

impl Validate for MarkRecord {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("MarkRecord", |ctx| {
            ctx.in_field("mark_anchor", |ctx| {
                self.mark_anchor.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::MarkRecord> for MarkRecord {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::MarkRecord, offset_data: FontData) -> Self {
        MarkRecord {
            mark_class: obj.mark_class(),
            mark_anchor: obj.mark_anchor(offset_data).to_owned_table(),
        }
    }
}

/// [Lookup Type 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#lookup-type-1-single-adjustment-positioning-subtable): Single Adjustment Positioning Subtable
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum SinglePos {
    Format1(SinglePosFormat1),
    Format2(SinglePosFormat2),
}

impl SinglePos {
    /// Construct a new `SinglePosFormat1` subtable
    pub fn format_1(coverage: CoverageTable, value_record: ValueRecord) -> Self {
        Self::Format1(SinglePosFormat1::new(coverage, value_record))
    }

    /// Construct a new `SinglePosFormat2` subtable
    pub fn format_2(coverage: CoverageTable, value_records: Vec<ValueRecord>) -> Self {
        Self::Format2(SinglePosFormat2::new(coverage, value_records))
    }
}

impl Default for SinglePos {
    fn default() -> Self {
        Self::Format1(Default::default())
    }
}

impl FontWrite for SinglePos {
    fn write_into(&self, writer: &mut TableWriter) {
        match self {
            Self::Format1(item) => item.write_into(writer),
            Self::Format2(item) => item.write_into(writer),
        }
    }
    fn table_type(&self) -> TableType {
        match self {
            Self::Format1(item) => item.table_type(),
            Self::Format2(item) => item.table_type(),
        }
    }
}

impl Validate for SinglePos {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        match self {
            Self::Format1(item) => item.validate_impl(ctx),
            Self::Format2(item) => item.validate_impl(ctx),
        }
    }
}

impl FromObjRef<read_fonts::tables::gpos::SinglePos<'_>> for SinglePos {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::SinglePos, _: FontData) -> Self {
        use read_fonts::tables::gpos::SinglePos as ObjRefType;
        match obj {
            ObjRefType::Format1(item) => SinglePos::Format1(item.to_owned_table()),
            ObjRefType::Format2(item) => SinglePos::Format2(item.to_owned_table()),
        }
    }
}

impl FromTableRef<read_fonts::tables::gpos::SinglePos<'_>> for SinglePos {}

impl ReadArgs for SinglePos {
    type Args = ();
}

impl<'a> FontRead<'a> for SinglePos {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::SinglePos as FontRead>::read(data).map(|x| x.to_owned_table())
    }
}

impl From<SinglePosFormat1> for SinglePos {
    fn from(src: SinglePosFormat1) -> SinglePos {
        SinglePos::Format1(src)
    }
}

impl From<SinglePosFormat2> for SinglePos {
    fn from(src: SinglePosFormat2) -> SinglePos {
        SinglePos::Format2(src)
    }
}

/// [Single Adjustment Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#single-adjustment-positioning-format-1-single-positioning-value): Single Positioning Value
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct SinglePosFormat1 {
    /// Offset to Coverage table, from beginning of SinglePos subtable.
    pub coverage: OffsetMarker<CoverageTable>,
    /// Defines positioning value(s) — applied to all glyphs in the
    /// Coverage table.
    pub value_record: ValueRecord,
}

impl SinglePosFormat1 {
    /// Construct a new `SinglePosFormat1`
    pub fn new(coverage: CoverageTable, value_record: ValueRecord) -> Self {
        Self {
            coverage: coverage.into(),
            value_record,
        }
    }
}

impl FontWrite for SinglePosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.coverage.write_into(writer);
        (self.compute_value_format() as ValueFormat).write_into(writer);
        self.value_record.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("SinglePosFormat1")
    }
}

impl Validate for SinglePosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("SinglePosFormat1", |ctx| {
            ctx.in_field("coverage", |ctx| {
                self.coverage.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::SinglePosFormat1<'a>> for SinglePosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::SinglePosFormat1<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        SinglePosFormat1 {
            coverage: obj.coverage().to_owned_table(),
            value_record: obj.value_record().to_owned_obj(offset_data),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::SinglePosFormat1<'a>> for SinglePosFormat1 {}

impl ReadArgs for SinglePosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for SinglePosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::SinglePosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// [Single Adjustment Positioning Format 2](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#single-adjustment-positioning-format-2-array-of-positioning-values): Array of Positioning Values
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct SinglePosFormat2 {
    /// Offset to Coverage table, from beginning of SinglePos subtable.
    pub coverage: OffsetMarker<CoverageTable>,
    /// Array of ValueRecords — positioning values applied to glyphs.
    pub value_records: Vec<ValueRecord>,
}

impl SinglePosFormat2 {
    /// Construct a new `SinglePosFormat2`
    pub fn new(coverage: CoverageTable, value_records: Vec<ValueRecord>) -> Self {
        Self {
            coverage: coverage.into(),
            value_records,
        }
    }
}

impl FontWrite for SinglePosFormat2 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (2 as u16).write_into(writer);
        self.coverage.write_into(writer);
        (self.compute_value_format() as ValueFormat).write_into(writer);
        (u16::try_from(array_len(&self.value_records)).unwrap()).write_into(writer);
        self.value_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("SinglePosFormat2")
    }
}

impl Validate for SinglePosFormat2 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("SinglePosFormat2", |ctx| {
            ctx.in_field("coverage", |ctx| {
                self.coverage.validate_impl(ctx);
            });
            ctx.in_field("value_records", |ctx| {
                if self.value_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.value_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::SinglePosFormat2<'a>> for SinglePosFormat2 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::SinglePosFormat2<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        SinglePosFormat2 {
            coverage: obj.coverage().to_owned_table(),
            value_records: obj
                .value_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::SinglePosFormat2<'a>> for SinglePosFormat2 {}

impl ReadArgs for SinglePosFormat2 {
    type Args = ();
}

impl<'a> FontRead<'a> for SinglePosFormat2 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::SinglePosFormat2 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// [Lookup Type 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#lookup-type-1-single-adjustment-positioning-subtable): Single Adjustment Positioning Subtable
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum PairPos {
    Format1(PairPosFormat1),
    Format2(PairPosFormat2),
}

impl PairPos {
    /// Construct a new `PairPosFormat1` subtable
    pub fn format_1(coverage: CoverageTable, pair_sets: Vec<PairSet>) -> Self {
        Self::Format1(PairPosFormat1::new(coverage, pair_sets))
    }

    /// Construct a new `PairPosFormat2` subtable
    pub fn format_2(
        coverage: CoverageTable,
        class_def1: ClassDef,
        class_def2: ClassDef,
        class1_records: Vec<Class1Record>,
    ) -> Self {
        Self::Format2(PairPosFormat2::new(
            coverage,
            class_def1,
            class_def2,
            class1_records,
        ))
    }
}

impl Default for PairPos {
    fn default() -> Self {
        Self::Format1(Default::default())
    }
}

impl FontWrite for PairPos {
    fn write_into(&self, writer: &mut TableWriter) {
        match self {
            Self::Format1(item) => item.write_into(writer),
            Self::Format2(item) => item.write_into(writer),
        }
    }
    fn table_type(&self) -> TableType {
        match self {
            Self::Format1(item) => item.table_type(),
            Self::Format2(item) => item.table_type(),
        }
    }
}

impl Validate for PairPos {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        match self {
            Self::Format1(item) => item.validate_impl(ctx),
            Self::Format2(item) => item.validate_impl(ctx),
        }
    }
}

impl FromObjRef<read_fonts::tables::gpos::PairPos<'_>> for PairPos {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::PairPos, _: FontData) -> Self {
        use read_fonts::tables::gpos::PairPos as ObjRefType;
        match obj {
            ObjRefType::Format1(item) => PairPos::Format1(item.to_owned_table()),
            ObjRefType::Format2(item) => PairPos::Format2(item.to_owned_table()),
        }
    }
}

impl FromTableRef<read_fonts::tables::gpos::PairPos<'_>> for PairPos {}

impl ReadArgs for PairPos {
    type Args = ();
}

impl<'a> FontRead<'a> for PairPos {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::PairPos as FontRead>::read(data).map(|x| x.to_owned_table())
    }
}

impl From<PairPosFormat1> for PairPos {
    fn from(src: PairPosFormat1) -> PairPos {
        PairPos::Format1(src)
    }
}

impl From<PairPosFormat2> for PairPos {
    fn from(src: PairPosFormat2) -> PairPos {
        PairPos::Format2(src)
    }
}

/// [Pair Adjustment Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#pair-adjustment-positioning-format-1-adjustments-for-glyph-pairs): Adjustments for Glyph Pairs
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct PairPosFormat1 {
    /// Offset to Coverage table, from beginning of PairPos subtable.
    pub coverage: OffsetMarker<CoverageTable>,
    /// Array of offsets to PairSet tables. Offsets are from beginning
    /// of PairPos subtable, ordered by Coverage Index.
    pub pair_sets: Vec<OffsetMarker<PairSet>>,
}

impl PairPosFormat1 {
    /// Construct a new `PairPosFormat1`
    pub fn new(coverage: CoverageTable, pair_sets: Vec<PairSet>) -> Self {
        Self {
            coverage: coverage.into(),
            pair_sets: pair_sets.into_iter().map(Into::into).collect(),
        }
    }
}

impl FontWrite for PairPosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.coverage.write_into(writer);
        (self.compute_value_format1() as ValueFormat).write_into(writer);
        (self.compute_value_format2() as ValueFormat).write_into(writer);
        (u16::try_from(array_len(&self.pair_sets)).unwrap()).write_into(writer);
        self.pair_sets.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("PairPosFormat1")
    }
}

impl Validate for PairPosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("PairPosFormat1", |ctx| {
            ctx.in_field("coverage", |ctx| {
                self.coverage.validate_impl(ctx);
            });
            ctx.in_field("pair_sets", |ctx| {
                if self.pair_sets.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.check_format_consistency(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::PairPosFormat1<'a>> for PairPosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::PairPosFormat1<'a>, _: FontData) -> Self {
        PairPosFormat1 {
            coverage: obj.coverage().to_owned_table(),
            pair_sets: obj.pair_sets().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::PairPosFormat1<'a>> for PairPosFormat1 {}

impl ReadArgs for PairPosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for PairPosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::PairPosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [PairPosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct PairSet {
    /// Array of PairValueRecords, ordered by glyph ID of the second
    /// glyph.
    pub pair_value_records: Vec<PairValueRecord>,
}

impl PairSet {
    /// Construct a new `PairSet`
    pub fn new(pair_value_records: Vec<PairValueRecord>) -> Self {
        Self { pair_value_records }
    }
}

impl FontWrite for PairSet {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.pair_value_records)).unwrap()).write_into(writer);
        self.pair_value_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("PairSet")
    }
}

impl Validate for PairSet {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("PairSet", |ctx| {
            ctx.in_field("pair_value_records", |ctx| {
                if self.pair_value_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.pair_value_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::PairSet<'a>> for PairSet {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::PairSet<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        PairSet {
            pair_value_records: obj
                .pair_value_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::PairSet<'a>> for PairSet {}

/// Part of [PairSet]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct PairValueRecord {
    /// Glyph ID of second glyph in the pair (first glyph is listed in
    /// the Coverage table).
    pub second_glyph: GlyphId16,
    /// Positioning data for the first glyph in the pair.
    pub value_record1: ValueRecord,
    /// Positioning data for the second glyph in the pair.
    pub value_record2: ValueRecord,
}

impl PairValueRecord {
    /// Construct a new `PairValueRecord`
    pub fn new(
        second_glyph: GlyphId16,
        value_record1: ValueRecord,
        value_record2: ValueRecord,
    ) -> Self {
        Self {
            second_glyph,
            value_record1,
            value_record2,
        }
    }
}

impl FontWrite for PairValueRecord {
    fn write_into(&self, writer: &mut TableWriter) {
        self.second_glyph.write_into(writer);
        self.value_record1.write_into(writer);
        self.value_record2.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("PairValueRecord")
    }
}

impl Validate for PairValueRecord {
    fn validate_impl(&self, _ctx: &mut ValidationCtx) {}
}

impl FromObjRef<read_fonts::tables::gpos::PairValueRecord> for PairValueRecord {
    fn from_obj_ref(
        obj: &read_fonts::tables::gpos::PairValueRecord,
        offset_data: FontData,
    ) -> Self {
        PairValueRecord {
            second_glyph: obj.second_glyph(),
            value_record1: obj.value_record1().to_owned_obj(offset_data),
            value_record2: obj.value_record2().to_owned_obj(offset_data),
        }
    }
}

/// [Pair Adjustment Positioning Format 2](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#pair-adjustment-positioning-format-2-class-pair-adjustment): Class Pair Adjustment
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct PairPosFormat2 {
    /// Offset to Coverage table, from beginning of PairPos subtable.
    pub coverage: OffsetMarker<CoverageTable>,
    /// Offset to ClassDef table, from beginning of PairPos subtable
    /// — for the first glyph of the pair.
    pub class_def1: OffsetMarker<ClassDef>,
    /// Offset to ClassDef table, from beginning of PairPos subtable
    /// — for the second glyph of the pair.
    pub class_def2: OffsetMarker<ClassDef>,
    /// Array of Class1 records, ordered by classes in classDef1.
    pub class1_records: Vec<Class1Record>,
}

impl PairPosFormat2 {
    /// Construct a new `PairPosFormat2`
    pub fn new(
        coverage: CoverageTable,
        class_def1: ClassDef,
        class_def2: ClassDef,
        class1_records: Vec<Class1Record>,
    ) -> Self {
        Self {
            coverage: coverage.into(),
            class_def1: class_def1.into(),
            class_def2: class_def2.into(),
            class1_records,
        }
    }
}

impl FontWrite for PairPosFormat2 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (2 as u16).write_into(writer);
        self.coverage.write_into(writer);
        (self.compute_value_format1() as ValueFormat).write_into(writer);
        (self.compute_value_format2() as ValueFormat).write_into(writer);
        self.class_def1.write_into(writer);
        self.class_def2.write_into(writer);
        (self.compute_class1_count() as u16).write_into(writer);
        (self.compute_class2_count() as u16).write_into(writer);
        self.class1_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("PairPosFormat2")
    }
}

impl Validate for PairPosFormat2 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("PairPosFormat2", |ctx| {
            ctx.in_field("coverage", |ctx| {
                self.coverage.validate_impl(ctx);
            });
            ctx.in_field("class_def1", |ctx| {
                self.class_def1.validate_impl(ctx);
            });
            ctx.in_field("class_def2", |ctx| {
                self.class_def2.validate_impl(ctx);
            });
            ctx.in_field("class1_records", |ctx| {
                if self.class1_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.class1_records.validate_impl(ctx);
            });
            self.check_length_and_format_conformance(ctx);
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::PairPosFormat2<'a>> for PairPosFormat2 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::PairPosFormat2<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        PairPosFormat2 {
            coverage: obj.coverage().to_owned_table(),
            class_def1: obj.class_def1().to_owned_table(),
            class_def2: obj.class_def2().to_owned_table(),
            class1_records: obj
                .class1_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::PairPosFormat2<'a>> for PairPosFormat2 {}

impl ReadArgs for PairPosFormat2 {
    type Args = ();
}

impl<'a> FontRead<'a> for PairPosFormat2 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::PairPosFormat2 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [PairPosFormat2]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Class1Record {
    /// Array of Class2 records, ordered by classes in classDef2.
    pub class2_records: Vec<Class2Record>,
}

impl Class1Record {
    /// Construct a new `Class1Record`
    pub fn new(class2_records: Vec<Class2Record>) -> Self {
        Self { class2_records }
    }
}

impl FontWrite for Class1Record {
    fn write_into(&self, writer: &mut TableWriter) {
        self.class2_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("Class1Record")
    }
}

impl Validate for Class1Record {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("Class1Record", |ctx| {
            ctx.in_field("class2_records", |ctx| {
                if self.class2_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.class2_records.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::Class1Record<'_>> for Class1Record {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::Class1Record, offset_data: FontData) -> Self {
        Class1Record {
            class2_records: obj
                .class2_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

/// Part of [PairPosFormat2]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Class2Record {
    /// Positioning for first glyph — empty if valueFormat1 = 0.
    pub value_record1: ValueRecord,
    /// Positioning for second glyph — empty if valueFormat2 = 0.
    pub value_record2: ValueRecord,
}

impl Class2Record {
    /// Construct a new `Class2Record`
    pub fn new(value_record1: ValueRecord, value_record2: ValueRecord) -> Self {
        Self {
            value_record1,
            value_record2,
        }
    }
}

impl FontWrite for Class2Record {
    fn write_into(&self, writer: &mut TableWriter) {
        self.value_record1.write_into(writer);
        self.value_record2.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("Class2Record")
    }
}

impl Validate for Class2Record {
    fn validate_impl(&self, _ctx: &mut ValidationCtx) {}
}

impl FromObjRef<read_fonts::tables::gpos::Class2Record> for Class2Record {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::Class2Record, offset_data: FontData) -> Self {
        Class2Record {
            value_record1: obj.value_record1().to_owned_obj(offset_data),
            value_record2: obj.value_record2().to_owned_obj(offset_data),
        }
    }
}

/// [Cursive Attachment Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#cursive-attachment-positioning-format1-cursive-attachment): Cursvie attachment
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct CursivePosFormat1 {
    /// Offset to Coverage table, from beginning of CursivePos subtable.
    pub coverage: OffsetMarker<CoverageTable>,
    /// Array of EntryExit records, in Coverage index order.
    pub entry_exit_record: Vec<EntryExitRecord>,
}

impl CursivePosFormat1 {
    /// Construct a new `CursivePosFormat1`
    pub fn new(coverage: CoverageTable, entry_exit_record: Vec<EntryExitRecord>) -> Self {
        Self {
            coverage: coverage.into(),
            entry_exit_record,
        }
    }
}

impl FontWrite for CursivePosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.coverage.write_into(writer);
        (u16::try_from(array_len(&self.entry_exit_record)).unwrap()).write_into(writer);
        self.entry_exit_record.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("CursivePosFormat1")
    }
}

impl Validate for CursivePosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("CursivePosFormat1", |ctx| {
            ctx.in_field("coverage", |ctx| {
                self.coverage.validate_impl(ctx);
            });
            ctx.in_field("entry_exit_record", |ctx| {
                if self.entry_exit_record.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.entry_exit_record.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::CursivePosFormat1<'a>> for CursivePosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::CursivePosFormat1<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        CursivePosFormat1 {
            coverage: obj.coverage().to_owned_table(),
            entry_exit_record: obj.entry_exit_record().to_owned_obj(offset_data),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::CursivePosFormat1<'a>> for CursivePosFormat1 {}

impl ReadArgs for CursivePosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for CursivePosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::CursivePosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [CursivePosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct EntryExitRecord {
    /// Offset to entryAnchor table, from beginning of CursivePos
    /// subtable (may be NULL).
    pub entry_anchor: NullableOffsetMarker<AnchorTable>,
    /// Offset to exitAnchor table, from beginning of CursivePos
    /// subtable (may be NULL).
    pub exit_anchor: NullableOffsetMarker<AnchorTable>,
}

impl EntryExitRecord {
    /// Construct a new `EntryExitRecord`
    pub fn new(entry_anchor: Option<AnchorTable>, exit_anchor: Option<AnchorTable>) -> Self {
        Self {
            entry_anchor: entry_anchor.into(),
            exit_anchor: exit_anchor.into(),
        }
    }
}

impl FontWrite for EntryExitRecord {
    fn write_into(&self, writer: &mut TableWriter) {
        self.entry_anchor.write_into(writer);
        self.exit_anchor.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("EntryExitRecord")
    }
}

impl Validate for EntryExitRecord {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("EntryExitRecord", |ctx| {
            ctx.in_field("entry_anchor", |ctx| {
                self.entry_anchor.validate_impl(ctx);
            });
            ctx.in_field("exit_anchor", |ctx| {
                self.exit_anchor.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::EntryExitRecord> for EntryExitRecord {
    fn from_obj_ref(
        obj: &read_fonts::tables::gpos::EntryExitRecord,
        offset_data: FontData,
    ) -> Self {
        EntryExitRecord {
            entry_anchor: obj.entry_anchor(offset_data).to_owned_table(),
            exit_anchor: obj.exit_anchor(offset_data).to_owned_table(),
        }
    }
}

/// [Mark-to-Base Attachment Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#mark-to-base-attachment-positioning-format-1-mark-to-base-attachment-point): Mark-to-base Attachment Point
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct MarkBasePosFormat1 {
    /// Offset to markCoverage table, from beginning of MarkBasePos
    /// subtable.
    pub mark_coverage: OffsetMarker<CoverageTable>,
    /// Offset to baseCoverage table, from beginning of MarkBasePos
    /// subtable.
    pub base_coverage: OffsetMarker<CoverageTable>,
    /// Offset to MarkArray table, from beginning of MarkBasePos
    /// subtable.
    pub mark_array: OffsetMarker<MarkArray>,
    /// Offset to BaseArray table, from beginning of MarkBasePos
    /// subtable.
    pub base_array: OffsetMarker<BaseArray>,
}

impl MarkBasePosFormat1 {
    /// Construct a new `MarkBasePosFormat1`
    pub fn new(
        mark_coverage: CoverageTable,
        base_coverage: CoverageTable,
        mark_array: MarkArray,
        base_array: BaseArray,
    ) -> Self {
        Self {
            mark_coverage: mark_coverage.into(),
            base_coverage: base_coverage.into(),
            mark_array: mark_array.into(),
            base_array: base_array.into(),
        }
    }
}

impl FontWrite for MarkBasePosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.mark_coverage.write_into(writer);
        self.base_coverage.write_into(writer);
        (self.compute_mark_class_count() as u16).write_into(writer);
        self.mark_array.write_into(writer);
        self.base_array.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("MarkBasePosFormat1")
    }
}

impl Validate for MarkBasePosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("MarkBasePosFormat1", |ctx| {
            ctx.in_field("mark_coverage", |ctx| {
                self.mark_coverage.validate_impl(ctx);
            });
            ctx.in_field("base_coverage", |ctx| {
                self.base_coverage.validate_impl(ctx);
            });
            ctx.in_field("mark_array", |ctx| {
                self.mark_array.validate_impl(ctx);
            });
            ctx.in_field("base_array", |ctx| {
                self.base_array.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::MarkBasePosFormat1<'a>> for MarkBasePosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::MarkBasePosFormat1<'a>, _: FontData) -> Self {
        MarkBasePosFormat1 {
            mark_coverage: obj.mark_coverage().to_owned_table(),
            base_coverage: obj.base_coverage().to_owned_table(),
            mark_array: obj.mark_array().to_owned_table(),
            base_array: obj.base_array().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::MarkBasePosFormat1<'a>> for MarkBasePosFormat1 {}

impl ReadArgs for MarkBasePosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for MarkBasePosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::MarkBasePosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [MarkBasePosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct BaseArray {
    /// Array of BaseRecords, in order of baseCoverage Index.
    pub base_records: Vec<BaseRecord>,
}

impl BaseArray {
    /// Construct a new `BaseArray`
    pub fn new(base_records: Vec<BaseRecord>) -> Self {
        Self { base_records }
    }
}

impl FontWrite for BaseArray {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.base_records)).unwrap()).write_into(writer);
        self.base_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("BaseArray")
    }
}

impl Validate for BaseArray {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("BaseArray", |ctx| {
            ctx.in_field("base_records", |ctx| {
                if self.base_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.base_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::BaseArray<'a>> for BaseArray {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::BaseArray<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        BaseArray {
            base_records: obj
                .base_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::BaseArray<'a>> for BaseArray {}

/// Part of [BaseArray]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct BaseRecord {
    /// Array of offsets (one per mark class) to Anchor tables. Offsets
    /// are from beginning of BaseArray table, ordered by class
    /// (offsets may be NULL).
    pub base_anchors: Vec<NullableOffsetMarker<AnchorTable>>,
}

impl BaseRecord {
    /// Construct a new `BaseRecord`
    pub fn new(base_anchors: Vec<Option<AnchorTable>>) -> Self {
        Self {
            base_anchors: base_anchors.into_iter().map(Into::into).collect(),
        }
    }
}

impl FontWrite for BaseRecord {
    fn write_into(&self, writer: &mut TableWriter) {
        self.base_anchors.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("BaseRecord")
    }
}

impl Validate for BaseRecord {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("BaseRecord", |ctx| {
            ctx.in_field("base_anchors", |ctx| {
                if self.base_anchors.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.base_anchors.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::BaseRecord<'_>> for BaseRecord {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::BaseRecord, offset_data: FontData) -> Self {
        BaseRecord {
            base_anchors: obj.base_anchors(offset_data).to_owned_table(),
        }
    }
}

/// [Mark-to-Ligature Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#mark-to-ligature-attachment-positioning-format-1-mark-to-ligature-attachment): Mark-to-Ligature Attachment
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct MarkLigPosFormat1 {
    /// Offset to markCoverage table, from beginning of MarkLigPos
    /// subtable.
    pub mark_coverage: OffsetMarker<CoverageTable>,
    /// Offset to ligatureCoverage table, from beginning of MarkLigPos
    /// subtable.
    pub ligature_coverage: OffsetMarker<CoverageTable>,
    /// Offset to MarkArray table, from beginning of MarkLigPos
    /// subtable.
    pub mark_array: OffsetMarker<MarkArray>,
    /// Offset to LigatureArray table, from beginning of MarkLigPos
    /// subtable.
    pub ligature_array: OffsetMarker<LigatureArray>,
}

impl MarkLigPosFormat1 {
    /// Construct a new `MarkLigPosFormat1`
    pub fn new(
        mark_coverage: CoverageTable,
        ligature_coverage: CoverageTable,
        mark_array: MarkArray,
        ligature_array: LigatureArray,
    ) -> Self {
        Self {
            mark_coverage: mark_coverage.into(),
            ligature_coverage: ligature_coverage.into(),
            mark_array: mark_array.into(),
            ligature_array: ligature_array.into(),
        }
    }
}

impl FontWrite for MarkLigPosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.mark_coverage.write_into(writer);
        self.ligature_coverage.write_into(writer);
        (self.compute_mark_class_count() as u16).write_into(writer);
        self.mark_array.write_into(writer);
        self.ligature_array.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("MarkLigPosFormat1")
    }
}

impl Validate for MarkLigPosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("MarkLigPosFormat1", |ctx| {
            ctx.in_field("mark_coverage", |ctx| {
                self.mark_coverage.validate_impl(ctx);
            });
            ctx.in_field("ligature_coverage", |ctx| {
                self.ligature_coverage.validate_impl(ctx);
            });
            ctx.in_field("mark_array", |ctx| {
                self.mark_array.validate_impl(ctx);
            });
            ctx.in_field("ligature_array", |ctx| {
                self.ligature_array.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::MarkLigPosFormat1<'a>> for MarkLigPosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::MarkLigPosFormat1<'a>, _: FontData) -> Self {
        MarkLigPosFormat1 {
            mark_coverage: obj.mark_coverage().to_owned_table(),
            ligature_coverage: obj.ligature_coverage().to_owned_table(),
            mark_array: obj.mark_array().to_owned_table(),
            ligature_array: obj.ligature_array().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::MarkLigPosFormat1<'a>> for MarkLigPosFormat1 {}

impl ReadArgs for MarkLigPosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for MarkLigPosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::MarkLigPosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [MarkLigPosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct LigatureArray {
    /// Array of offsets to LigatureAttach tables. Offsets are from
    /// beginning of LigatureArray table, ordered by ligatureCoverage
    /// index.
    pub ligature_attaches: Vec<OffsetMarker<LigatureAttach>>,
}

impl LigatureArray {
    /// Construct a new `LigatureArray`
    pub fn new(ligature_attaches: Vec<LigatureAttach>) -> Self {
        Self {
            ligature_attaches: ligature_attaches.into_iter().map(Into::into).collect(),
        }
    }
}

impl FontWrite for LigatureArray {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.ligature_attaches)).unwrap()).write_into(writer);
        self.ligature_attaches.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("LigatureArray")
    }
}

impl Validate for LigatureArray {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("LigatureArray", |ctx| {
            ctx.in_field("ligature_attaches", |ctx| {
                if self.ligature_attaches.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.ligature_attaches.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::LigatureArray<'a>> for LigatureArray {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::LigatureArray<'a>, _: FontData) -> Self {
        LigatureArray {
            ligature_attaches: obj.ligature_attaches().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::LigatureArray<'a>> for LigatureArray {}

/// Part of [MarkLigPosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct LigatureAttach {
    /// Array of Component records, ordered in writing direction.
    pub component_records: Vec<ComponentRecord>,
}

impl LigatureAttach {
    /// Construct a new `LigatureAttach`
    pub fn new(component_records: Vec<ComponentRecord>) -> Self {
        Self { component_records }
    }
}

impl FontWrite for LigatureAttach {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.component_records)).unwrap()).write_into(writer);
        self.component_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("LigatureAttach")
    }
}

impl Validate for LigatureAttach {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("LigatureAttach", |ctx| {
            ctx.in_field("component_records", |ctx| {
                if self.component_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.component_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::LigatureAttach<'a>> for LigatureAttach {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::LigatureAttach<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        LigatureAttach {
            component_records: obj
                .component_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::LigatureAttach<'a>> for LigatureAttach {}

/// Part of [MarkLigPosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct ComponentRecord {
    /// Array of offsets (one per class) to Anchor tables. Offsets are
    /// from beginning of LigatureAttach table, ordered by class
    /// (offsets may be NULL).
    pub ligature_anchors: Vec<NullableOffsetMarker<AnchorTable>>,
}

impl ComponentRecord {
    /// Construct a new `ComponentRecord`
    pub fn new(ligature_anchors: Vec<Option<AnchorTable>>) -> Self {
        Self {
            ligature_anchors: ligature_anchors.into_iter().map(Into::into).collect(),
        }
    }
}

impl FontWrite for ComponentRecord {
    fn write_into(&self, writer: &mut TableWriter) {
        self.ligature_anchors.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("ComponentRecord")
    }
}

impl Validate for ComponentRecord {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("ComponentRecord", |ctx| {
            ctx.in_field("ligature_anchors", |ctx| {
                if self.ligature_anchors.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.ligature_anchors.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::ComponentRecord<'_>> for ComponentRecord {
    fn from_obj_ref(
        obj: &read_fonts::tables::gpos::ComponentRecord,
        offset_data: FontData,
    ) -> Self {
        ComponentRecord {
            ligature_anchors: obj.ligature_anchors(offset_data).to_owned_table(),
        }
    }
}

/// [Mark-to-Mark Attachment Positioning Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#mark-to-mark-attachment-positioning-format-1-mark-to-mark-attachment): Mark-to-Mark Attachment
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct MarkMarkPosFormat1 {
    /// Offset to Combining Mark Coverage table, from beginning of
    /// MarkMarkPos subtable.
    pub mark1_coverage: OffsetMarker<CoverageTable>,
    /// Offset to Base Mark Coverage table, from beginning of
    /// MarkMarkPos subtable.
    pub mark2_coverage: OffsetMarker<CoverageTable>,
    /// Offset to MarkArray table for mark1, from beginning of
    /// MarkMarkPos subtable.
    pub mark1_array: OffsetMarker<MarkArray>,
    /// Offset to Mark2Array table for mark2, from beginning of
    /// MarkMarkPos subtable.
    pub mark2_array: OffsetMarker<Mark2Array>,
}

impl MarkMarkPosFormat1 {
    /// Construct a new `MarkMarkPosFormat1`
    pub fn new(
        mark1_coverage: CoverageTable,
        mark2_coverage: CoverageTable,
        mark1_array: MarkArray,
        mark2_array: Mark2Array,
    ) -> Self {
        Self {
            mark1_coverage: mark1_coverage.into(),
            mark2_coverage: mark2_coverage.into(),
            mark1_array: mark1_array.into(),
            mark2_array: mark2_array.into(),
        }
    }
}

impl FontWrite for MarkMarkPosFormat1 {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (1 as u16).write_into(writer);
        self.mark1_coverage.write_into(writer);
        self.mark2_coverage.write_into(writer);
        (self.compute_mark_class_count() as u16).write_into(writer);
        self.mark1_array.write_into(writer);
        self.mark2_array.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("MarkMarkPosFormat1")
    }
}

impl Validate for MarkMarkPosFormat1 {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("MarkMarkPosFormat1", |ctx| {
            ctx.in_field("mark1_coverage", |ctx| {
                self.mark1_coverage.validate_impl(ctx);
            });
            ctx.in_field("mark2_coverage", |ctx| {
                self.mark2_coverage.validate_impl(ctx);
            });
            ctx.in_field("mark1_array", |ctx| {
                self.mark1_array.validate_impl(ctx);
            });
            ctx.in_field("mark2_array", |ctx| {
                self.mark2_array.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::MarkMarkPosFormat1<'a>> for MarkMarkPosFormat1 {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::MarkMarkPosFormat1<'a>, _: FontData) -> Self {
        MarkMarkPosFormat1 {
            mark1_coverage: obj.mark1_coverage().to_owned_table(),
            mark2_coverage: obj.mark2_coverage().to_owned_table(),
            mark1_array: obj.mark1_array().to_owned_table(),
            mark2_array: obj.mark2_array().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::MarkMarkPosFormat1<'a>> for MarkMarkPosFormat1 {}

impl ReadArgs for MarkMarkPosFormat1 {
    type Args = ();
}

impl<'a> FontRead<'a> for MarkMarkPosFormat1 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        <read_fonts::tables::gpos::MarkMarkPosFormat1 as FontRead>::read(data)
            .map(|x| x.to_owned_table())
    }
}

/// Part of [MarkMarkPosFormat1]Class2Record
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Mark2Array {
    /// Array of Mark2Records, in Coverage order.
    pub mark2_records: Vec<Mark2Record>,
}

impl Mark2Array {
    /// Construct a new `Mark2Array`
    pub fn new(mark2_records: Vec<Mark2Record>) -> Self {
        Self { mark2_records }
    }
}

impl FontWrite for Mark2Array {
    #[allow(clippy::unnecessary_cast)]
    fn write_into(&self, writer: &mut TableWriter) {
        (u16::try_from(array_len(&self.mark2_records)).unwrap()).write_into(writer);
        self.mark2_records.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("Mark2Array")
    }
}

impl Validate for Mark2Array {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("Mark2Array", |ctx| {
            ctx.in_field("mark2_records", |ctx| {
                if self.mark2_records.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.mark2_records.validate_impl(ctx);
            });
        })
    }
}

impl<'a> FromObjRef<read_fonts::tables::gpos::Mark2Array<'a>> for Mark2Array {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::Mark2Array<'a>, _: FontData) -> Self {
        let offset_data = obj.offset_data();
        Mark2Array {
            mark2_records: obj
                .mark2_records()
                .iter()
                .filter_map(|x| x.map(|x| FromObjRef::from_obj_ref(&x, offset_data)).ok())
                .collect(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a> FromTableRef<read_fonts::tables::gpos::Mark2Array<'a>> for Mark2Array {}

/// Part of [MarkMarkPosFormat1]
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Mark2Record {
    /// Array of offsets (one per class) to Anchor tables. Offsets are
    /// from beginning of Mark2Array table, in class order (offsets may
    /// be NULL).
    pub mark2_anchors: Vec<NullableOffsetMarker<AnchorTable>>,
}

impl Mark2Record {
    /// Construct a new `Mark2Record`
    pub fn new(mark2_anchors: Vec<Option<AnchorTable>>) -> Self {
        Self {
            mark2_anchors: mark2_anchors.into_iter().map(Into::into).collect(),
        }
    }
}

impl FontWrite for Mark2Record {
    fn write_into(&self, writer: &mut TableWriter) {
        self.mark2_anchors.write_into(writer);
    }
    fn table_type(&self) -> TableType {
        TableType::Named("Mark2Record")
    }
}

impl Validate for Mark2Record {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("Mark2Record", |ctx| {
            ctx.in_field("mark2_anchors", |ctx| {
                if self.mark2_anchors.len() > to_usize(u16::MAX) {
                    ctx.report("array exceeds max length");
                }
                self.mark2_anchors.validate_impl(ctx);
            });
        })
    }
}

impl FromObjRef<read_fonts::tables::gpos::Mark2Record<'_>> for Mark2Record {
    fn from_obj_ref(obj: &read_fonts::tables::gpos::Mark2Record, offset_data: FontData) -> Self {
        Mark2Record {
            mark2_anchors: obj.mark2_anchors(offset_data).to_owned_table(),
        }
    }
}

/// [Extension Positioning Subtable Format 1](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#extension-positioning-subtable-format-1)
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct ExtensionPosFormat1<T> {
    /// Lookup type of subtable referenced by extensionOffset (i.e. the
    /// extension subtable).
    pub extension_lookup_type: u16,
    /// Offset to the extension subtable, of lookup type
    /// extensionLookupType, relative to the start of the
    /// ExtensionPosFormat1 subtable.
    pub extension: OffsetMarker<T, WIDTH_32>,
}

impl<T: Default> ExtensionPosFormat1<T> {
    /// Construct a new `ExtensionPosFormat1`
    pub fn new(extension_lookup_type: u16, extension: T) -> Self {
        Self {
            extension_lookup_type,
            extension: extension.into(),
        }
    }
}

impl<T: Validate> Validate for ExtensionPosFormat1<T> {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        ctx.in_table("ExtensionPosFormat1", |ctx| {
            ctx.in_field("extension", |ctx| {
                self.extension.validate_impl(ctx);
            });
        })
    }
}

impl<'a, T, U> FromObjRef<read_fonts::tables::gpos::ExtensionPosFormat1<'a, U>>
    for ExtensionPosFormat1<T>
where
    U: FontRead<'a, Args = ()>,
    T: FromTableRef<U> + Default + 'static,
{
    fn from_obj_ref(
        obj: &read_fonts::tables::gpos::ExtensionPosFormat1<'a, U>,
        _: FontData,
    ) -> Self {
        ExtensionPosFormat1 {
            extension_lookup_type: obj.extension_lookup_type(),
            extension: obj.extension().to_owned_table(),
        }
    }
}

#[allow(clippy::needless_lifetimes)]
impl<'a, T, U> FromTableRef<read_fonts::tables::gpos::ExtensionPosFormat1<'a, U>>
    for ExtensionPosFormat1<T>
where
    U: FontRead<'a, Args = ()>,
    T: FromTableRef<U> + Default + 'static,
{
}

/// A [GPOS Extension Positioning](https://learn.microsoft.com/en-us/typography/opentype/spec/gpos#lookuptype-9-extension-positioning) subtable
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum ExtensionSubtable {
    Single(ExtensionPosFormat1<SinglePos>),
    Pair(ExtensionPosFormat1<PairPos>),
    Cursive(ExtensionPosFormat1<CursivePosFormat1>),
    MarkToBase(ExtensionPosFormat1<MarkBasePosFormat1>),
    MarkToLig(ExtensionPosFormat1<MarkLigPosFormat1>),
    MarkToMark(ExtensionPosFormat1<MarkMarkPosFormat1>),
    Contextual(ExtensionPosFormat1<PositionSequenceContext>),
    ChainContextual(ExtensionPosFormat1<PositionChainContext>),
}

impl Default for ExtensionSubtable {
    fn default() -> Self {
        Self::Single(Default::default())
    }
}

impl FontWrite for ExtensionSubtable {
    fn write_into(&self, writer: &mut TableWriter) {
        match self {
            Self::Single(table) => table.write_into(writer),
            Self::Pair(table) => table.write_into(writer),
            Self::Cursive(table) => table.write_into(writer),
            Self::MarkToBase(table) => table.write_into(writer),
            Self::MarkToLig(table) => table.write_into(writer),
            Self::MarkToMark(table) => table.write_into(writer),
            Self::Contextual(table) => table.write_into(writer),
            Self::ChainContextual(table) => table.write_into(writer),
        }
    }
    fn table_type(&self) -> TableType {
        match self {
            Self::Single(table) => table.table_type(),
            Self::Pair(table) => table.table_type(),
            Self::Cursive(table) => table.table_type(),
            Self::MarkToBase(table) => table.table_type(),
            Self::MarkToLig(table) => table.table_type(),
            Self::MarkToMark(table) => table.table_type(),
            Self::Contextual(table) => table.table_type(),
            Self::ChainContextual(table) => table.table_type(),
        }
    }
}

impl Validate for ExtensionSubtable {
    fn validate_impl(&self, ctx: &mut ValidationCtx) {
        match self {
            Self::Single(table) => table.validate_impl(ctx),
            Self::Pair(table) => table.validate_impl(ctx),
            Self::Cursive(table) => table.validate_impl(ctx),
            Self::MarkToBase(table) => table.validate_impl(ctx),
            Self::MarkToLig(table) => table.validate_impl(ctx),
            Self::MarkToMark(table) => table.validate_impl(ctx),
            Self::Contextual(table) => table.validate_impl(ctx),
            Self::ChainContextual(table) => table.validate_impl(ctx),
        }
    }
}

impl FromObjRef<read_fonts::tables::gpos::ExtensionSubtable<'_>> for ExtensionSubtable {
    fn from_obj_ref(
        from: &read_fonts::tables::gpos::ExtensionSubtable<'_>,
        data: FontData,
    ) -> Self {
        match from {
            read_fonts::tables::gpos::ExtensionSubtable::Single(table) => {
                Self::Single(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::Pair(table) => {
                Self::Pair(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::Cursive(table) => {
                Self::Cursive(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::MarkToBase(table) => {
                Self::MarkToBase(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::MarkToLig(table) => {
                Self::MarkToLig(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::MarkToMark(table) => {
                Self::MarkToMark(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::Contextual(table) => {
                Self::Contextual(table.to_owned_obj(data))
            }
            read_fonts::tables::gpos::ExtensionSubtable::ChainContextual(table) => {
                Self::ChainContextual(table.to_owned_obj(data))
            }
        }
    }
}

impl FromTableRef<read_fonts::tables::gpos::ExtensionSubtable<'_>> for ExtensionSubtable {}

impl From<ExtensionPosFormat1<SinglePos>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<SinglePos>) -> ExtensionSubtable {
        ExtensionSubtable::Single(src)
    }
}

impl From<ExtensionPosFormat1<PairPos>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<PairPos>) -> ExtensionSubtable {
        ExtensionSubtable::Pair(src)
    }
}

impl From<ExtensionPosFormat1<CursivePosFormat1>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<CursivePosFormat1>) -> ExtensionSubtable {
        ExtensionSubtable::Cursive(src)
    }
}

impl From<ExtensionPosFormat1<MarkBasePosFormat1>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<MarkBasePosFormat1>) -> ExtensionSubtable {
        ExtensionSubtable::MarkToBase(src)
    }
}

impl From<ExtensionPosFormat1<MarkLigPosFormat1>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<MarkLigPosFormat1>) -> ExtensionSubtable {
        ExtensionSubtable::MarkToLig(src)
    }
}

impl From<ExtensionPosFormat1<MarkMarkPosFormat1>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<MarkMarkPosFormat1>) -> ExtensionSubtable {
        ExtensionSubtable::MarkToMark(src)
    }
}

impl From<ExtensionPosFormat1<PositionSequenceContext>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<PositionSequenceContext>) -> ExtensionSubtable {
        ExtensionSubtable::Contextual(src)
    }
}

impl From<ExtensionPosFormat1<PositionChainContext>> for ExtensionSubtable {
    fn from(src: ExtensionPosFormat1<PositionChainContext>) -> ExtensionSubtable {
        ExtensionSubtable::ChainContextual(src)
    }
}