harfrust 0.15.0

A complete HarfBuzz shaping algorithm port to Rust.
Documentation 
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//! OpenType GSUB lookups.

use crate::buffer::Buffer;
use crate::ot::layout::*;
use crate::plan::ShapePlan;
use crate::ShaperFont;

pub fn substitute(plan: &ShapePlan, font: &ShaperFont<'_, '_>, buffer: &mut Buffer) {
    #[cfg(feature = "tracing")]
    let tag = crate::ot::map::MessageTag(plan.ot_map.chosen_script(LayoutTableKind::Gsub));
    if !buffer_message!(buffer, font, "start table GSUB script tag '{tag:#}'") {
        return;
    }
    let table = font.layout().ot.gsub();
    apply_layout_table(plan, font, buffer, table.as_ref());
    buffer_message!(buffer, font, "end table GSUB script tag '{tag:#}'");
}