ttf_parser/tables/cmap/
format10.rs

1use crate::parser::{LazyArray32, Stream};
2use crate::GlyphId;
3
4/// A [format 10](https://docs.microsoft.com/en-us/typography/opentype/spec/cmap#format-10-trimmed-array)
5/// subtable.
6#[derive(Clone, Copy, Debug)]
7pub struct Subtable10<'a> {
8    /// First character code covered.
9    pub first_code_point: u32,
10    /// Array of glyph indices for the character codes covered.
11    pub glyphs: LazyArray32<'a, GlyphId>,
12}
13
14impl<'a> Subtable10<'a> {
15    /// Parses a subtable from raw data.
16    pub fn parse(data: &'a [u8]) -> Option<Self> {
17        let mut s = Stream::new(data);
18        s.skip::<u16>(); // format
19        s.skip::<u16>(); // reserved
20        s.skip::<u32>(); // length
21        s.skip::<u32>(); // language
22        let first_code_point = s.read::<u32>()?;
23        let count = s.read::<u32>()?;
24        let glyphs = s.read_array32::<GlyphId>(count)?;
25        Some(Self { first_code_point, glyphs })
26    }
27
28    /// Returns a glyph index for a code point.
29    pub fn glyph_index(&self, code_point: u32) -> Option<GlyphId> {
30        let idx = code_point.checked_sub(self.first_code_point)?;
31        self.glyphs.get(idx)
32    }
33
34    /// Calls `f` for each codepoint defined in this table.
35    pub fn codepoints(&self, mut f: impl FnMut(u32)) {
36        for i in 0..self.glyphs.len() {
37            if let Some(code_point) = self.first_code_point.checked_add(i) {
38                f(code_point);
39            }
40        }
41    }
42}
ttf_parser/tables/cmap/format10.rs

ttf_parser/tables/cmap/
format10.rs
