50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
//! Font handling.
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use fontdock::{ContainsChar, FaceFromVec, FontSource};
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use ttf_parser::Face;
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/// A font loader that is backed by a dynamic source.
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pub type FontLoader = fontdock::FontLoader<Box<dyn FontSource<Face = FaceBuf>>>;
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/// An owned font face.
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pub struct FaceBuf {
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data: Box<[u8]>,
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face: Face<'static>,
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}
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impl FaceBuf {
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/// Get a reference to the underlying face.
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pub fn get(&self) -> &Face<'_> {
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// We can't implement Deref because that would leak the internal 'static
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// lifetime.
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&self.face
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}
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/// The raw face data.
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pub fn data(&self) -> &[u8] {
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&self.data
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}
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}
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impl FaceFromVec for FaceBuf {
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fn from_vec(vec: Vec<u8>, i: u32) -> Option<Self> {
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let data = vec.into_boxed_slice();
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// SAFETY: The slices's location is stable in memory since we don't
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// touch it and it can't be touched from outside this type.
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let slice: &'static [u8] =
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unsafe { std::slice::from_raw_parts(data.as_ptr(), data.len()) };
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Some(Self {
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data,
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face: Face::from_slice(slice, i).ok()?,
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})
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}
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}
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impl ContainsChar for FaceBuf {
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fn contains_char(&self, c: char) -> bool {
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self.get().glyph_index(c).is_some()
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}
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}
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