write-fonts 0.55.0

Writing font files.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

//! the [GSUB] table
//!
//! [GSUB]: https://docs.microsoft.com/en-us/typography/opentype/spec/gsub

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

use super::layout::{
    ChainedSequenceContext, CoverageTable, FeatureList, FeatureVariations, Lookup, LookupList,
    LookupSubtable, LookupType, ScriptList, SequenceContext,
};

pub mod builders;
#[cfg(test)]
mod extended;
#[cfg(test)]
mod spec_tests;

/// A GSUB lookup list table.
pub type SubstitutionLookupList = LookupList<SubstitutionLookup>;

/// A lookup list with the original 16-bit offsets.
pub type OriginalSubstitutionLookupList = SubstitutionLookupList;

/// A lookup list with 32-bit offsets.
pub type SubstitutionLookupList2 = super::layout::LookupList2<SubstitutionLookup>;

super::layout::table_newtype!(
    SubstitutionSequenceContext,
    SequenceContext,
    read_fonts::tables::layout::SequenceContext<'a>
);

super::layout::table_newtype!(
    SubstitutionChainContext,
    ChainedSequenceContext,
    read_fonts::tables::layout::ChainedSequenceContext<'a>
);

impl Gsub {
    /// Creates a GSUB table using the original 16-bit header offsets.
    pub fn new(
        script_list: ScriptList,
        feature_list: FeatureList,
        lookup_list: SubstitutionLookupList,
    ) -> Self {
        Self {
            script_list: Some(script_list).into(),
            feature_list: Some(feature_list).into(),
            lookup_list: Some(lookup_list).into(),
            ..Default::default()
        }
    }

    fn compute_version(&self) -> MajorMinor {
        if self.script_list2.is_some()
            || self.feature_list2.is_some()
            || self.lookup_list2.is_some()
        {
            MajorMinor::new(1, 2)
        } else if self.feature_variations.is_none() {
            MajorMinor::VERSION_1_0
        } else {
            MajorMinor::VERSION_1_1
        }
    }
}

super::layout::lookup_type!(gsub, SingleSubst, 1);
super::layout::lookup_type!(gsub, MultipleSubstFormat1, 2);
super::layout::lookup_type!(gsub, AlternateSubstFormat1, 3);
super::layout::lookup_type!(gsub, LigatureSubstFormat1, 4);
super::layout::lookup_type!(gsub, SubstitutionSequenceContext, 5);
super::layout::lookup_type!(gsub, SubstitutionChainContext, 6);
super::layout::lookup_type!(gsub, ExtensionSubtable, 7);
super::layout::lookup_type!(gsub, ReverseChainSingleSubstFormat1, 8);

impl<T: LookupSubtable + FontWrite> FontWrite for ExtensionSubstFormat1<T> {
    fn write_into(&self, writer: &mut TableWriter) {
        1u16.write_into(writer);
        T::TYPE.write_into(writer);
        self.extension.write_into(writer);
    }
}

// these can't have auto impls because the traits don't support generics
impl ReadArgs for SubstitutionLookup {
    type Args = ();
}

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

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

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

super::layout::lookup_type!(gsub, MultipleSubst, 2);
super::layout::lookup_type!(gsub, MultipleSubstFormat2, 2);
super::layout::original_lookup!(
    SubstitutionLookup,
    Multiple,
    MultipleSubstFormat1,
    MultipleSubst
);

super::layout::lookup_type!(gsub, AlternateSubst, 3);
super::layout::lookup_type!(gsub, AlternateSubstFormat2, 3);
super::layout::original_lookup!(
    SubstitutionLookup,
    Alternate,
    AlternateSubstFormat1,
    AlternateSubst
);

super::layout::lookup_type!(gsub, LigatureSubst, 4);
super::layout::lookup_type!(gsub, LigatureSubstFormat2, 4);
super::layout::original_lookup!(
    SubstitutionLookup,
    Ligature,
    LigatureSubstFormat1,
    LigatureSubst
);

super::layout::lookup_type!(gsub, ReverseChainSingleSubst, 8);
super::layout::lookup_type!(gsub, ReverseChainSingleSubstFormat2, 8);
super::layout::original_lookup!(
    SubstitutionLookup,
    Reverse,
    ReverseChainSingleSubstFormat1,
    ReverseChainSingleSubst
);

impl ReadArgs for SubstitutionLookupList2 {
    type Args = ();
}

impl<'a> FontRead<'a> for SubstitutionLookupList2 {
    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
        read_fonts::tables::gsub::SubstitutionLookupList2::read(data).map(|x| x.to_owned_table())
    }
}