ttf_parser/tables/
vorg.rs

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1// https://docs.microsoft.com/en-us/typography/opentype/spec/vorg
2
3use crate::GlyphId;
4use crate::parser::{Stream, FromData, LazyArray16};
5
6
7#[derive(Clone, Copy)]
8struct VertOriginYMetrics {
9    glyph_index: GlyphId,
10    vert_origin_y: i16,
11}
12
13impl FromData for VertOriginYMetrics {
14    const SIZE: usize = 4;
15
16    #[inline]
17    fn parse(data: &[u8]) -> Option<Self> {
18        let mut s = Stream::new(data);
19        Some(VertOriginYMetrics {
20            glyph_index: s.read::<GlyphId>()?,
21            vert_origin_y: s.read::<i16>()?,
22        })
23    }
24}
25
26
27#[derive(Clone, Copy)]
28pub struct Table<'a> {
29    default_y: i16,
30    origins: LazyArray16<'a, VertOriginYMetrics>,
31}
32
33impl<'a> Table<'a> {
34    pub fn parse(data: &'a [u8]) -> Option<Self> {
35        let mut s = Stream::new(data);
36
37        let version: u32 = s.read()?;
38        if version != 0x00010000 {
39            return None;
40        }
41
42        let default_y: i16 = s.read()?;
43        let count: u16 = s.read()?;
44        let origins = s.read_array16::<VertOriginYMetrics>(count)?;
45
46        Some(Table {
47            default_y,
48            origins,
49        })
50    }
51
52    pub fn glyph_y_origin(&self, glyph_id: GlyphId) -> i16 {
53        self.origins.binary_search_by(|m| m.glyph_index.cmp(&glyph_id))
54            .map(|(_, m)| m.vert_origin_y)
55            .unwrap_or(self.default_y)
56    }
57}
ttf_parser/tables/vorg.rs

ttf_parser/tables/
vorg.rs
