msdfgen 0.2.1

Safe bindings for msdfgen (multi-channel signed distance field generator)
Documentation 
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use crate::{EdgeColor, EdgeHolder, FontExt, Point2, Shape};
use font_rs as font;
use std::{
    cell::RefCell,
    sync::{Mutex, RwLock},
};

impl<T: typeface::Tape> FontExt for RefCell<font::Font<T>> {
    type Glyph = char;

    fn glyph_shape(&self, glyph: Self::Glyph) -> Option<Shape> {
        glyph_shape(&mut self.borrow_mut(), glyph)
    }
}

impl<T: typeface::Tape> FontExt for Mutex<font::Font<T>> {
    type Glyph = char;

    fn glyph_shape(&self, glyph: Self::Glyph) -> Option<Shape> {
        glyph_shape(&mut self.lock().unwrap(), glyph)
    }
}

impl<T: typeface::Tape> FontExt for RwLock<font::Font<T>> {
    type Glyph = char;

    fn glyph_shape(&self, glyph: Self::Glyph) -> Option<Shape> {
        glyph_shape(&mut self.write().unwrap(), glyph)
    }
}

fn glyph_shape<T: typeface::Tape>(font: &mut font::Font<T>, glyph: char) -> Option<Shape> {
    let glyph = font.draw(glyph).ok()??;
    let mut shape = Shape::default();

    for contour in glyph.iter() {
        let last_contour = shape.add_contour_mut();
        let font::Offset(x, y) = contour.offset;
        let mut last_point = Point2::new(x as f64, y as f64);

        for segment in contour.iter() {
            match *segment {
                font::Segment::Linear(font::Offset(x, y)) => {
                    let point = Point2::new(x as f64, y as f64);
                    last_contour.add_edge(&EdgeHolder::new_linear(
                        last_point,
                        point,
                        EdgeColor::default(),
                    ));
                    last_point = point;
                }
                font::Segment::Quadratic(font::Offset(cx, cy), font::Offset(x, y)) => {
                    let cpoint = Point2::new(cx as f64, cy as f64);
                    let point = Point2::new(x as f64, y as f64);
                    last_contour.add_edge(&EdgeHolder::new_quadratic(
                        last_point,
                        cpoint,
                        point,
                        EdgeColor::default(),
                    ));
                    last_point = point;
                }
                font::Segment::Cubic(
                    font::Offset(c1x, c1y),
                    font::Offset(c2x, c2y),
                    font::Offset(x, y),
                ) => {
                    let c1point = Point2::new(c1x as f64, c1y as f64);
                    let c2point = Point2::new(c2x as f64, c2y as f64);
                    let point = Point2::new(x as f64, y as f64);
                    last_contour.add_edge(&EdgeHolder::new_cubic(
                        last_point,
                        c1point,
                        c2point,
                        point,
                        EdgeColor::default(),
                    ));
                    last_point = point;
                }
            }
        }
    }

    shape.into()
}

// #[cfg(test)]
// mod test {
//     use super::*;
//     use font::Font;
//     use notosans::REGULAR_TTF;

//     #[test]
//     fn glyph_shape() {
//         let font = Font::read(&mut std::io::Cursor::new(&REGULAR_TTF)).unwrap();

//         let mut shapes = 0;

//         for glyph in "abcdefghABCDEFGH".chars() {
//             if let Some(_shape) = font.glyph_shape(glyph) {
//                 shapes += 1;
//             }
//         }

//         assert_eq!(shapes, 16);
//     }
// }