Function shape_text 

pub(crate) fn shape_text(
    text: &str,
    font: Arc<ResolvedFont>,
    small_caps: bool,
    apply_kerning: bool,
    variations: &[FontVariation],
    font_size: f32,
    font_optical_sizing: FontOpticalSizing,
    resolver: &FontResolver<'_>,
    fontdb: &mut Arc<Database>,
) -> Vec<Glyph>

Text shaping with font fallback.