sugarloaf 0.3.9

Sugarloaf is Rio rendering engine, designed to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintained for Rio terminal purposes but feel free to use it.
Documentation 
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//! Glyph metrics tables.

use super::{raw_tag, Bytes, RawTag};

pub const HMTX: RawTag = raw_tag(b"hmtx");
pub const VMTX: RawTag = raw_tag(b"vmtx");

/// Returns the advance for the specified glyph.
pub fn advance(data: &[u8], xmtx: u32, long_metric_count: u16, glyph_id: u16) -> u16 {
    let b = Bytes::new(data);
    let offset = if glyph_id < long_metric_count {
        glyph_id as usize * 4
    } else {
        (long_metric_count - 1) as usize * 4
    };
    b.read_u16(offset + xmtx as usize).unwrap_or(0)
}

/// Returns the side bearing for the specified glyph.
pub fn sb(data: &[u8], xmtx: u32, long_metric_count: u16, glyph_id: u16) -> i16 {
    let b = Bytes::new(data);
    let offset = if glyph_id < long_metric_count {
        glyph_id as usize * 4 + 2
    } else {
        long_metric_count as usize * 4 + (glyph_id - long_metric_count) as usize * 2
    };
    b.read_i16(offset + xmtx as usize).unwrap_or(0)
}