abglyphrasterizer

Coverage rasterization for lines, quadratic & cubic beziers. Useful for drawing .otf font glyphs.

Inspired by font-rs & stb_truetype.

Example

```rust let mut rasterizer = abglyphrasterizer::Rasterizer::new(106, 183);

// draw a 300px 'ę' character rasterizer.drawcubic(point(103.0, 163.5), point(86.25, 169.25), point(77.0, 165.0), point(82.25, 151.5)); rasterizer.drawcubic(point(82.25, 151.5), point(86.75, 139.75), point(94.0, 130.75), point(102.0, 122.0)); rasterizer.drawline(point(102.0, 122.0), point(100.25, 111.25)); rasterizer.drawcubic(point(100.25, 111.25), point(89.0, 112.75), point(72.75, 114.25), point(58.5, 114.25)); rasterizer.drawcubic(point(58.5, 114.25), point(30.75, 114.25), point(18.5, 105.25), point(16.75, 72.25)); rasterizer.drawline(point(16.75, 72.25), point(77.0, 72.25)); rasterizer.drawcubic(point(77.0, 72.25), point(97.0, 72.25), point(105.25, 60.25), point(104.75, 38.5)); rasterizer.drawcubic(point(104.75, 38.5), point(104.5, 13.5), point(89.0, 0.75), point(54.25, 0.75)); rasterizer.drawcubic(point(54.25, 0.75), point(16.0, 0.75), point(0.0, 16.75), point(0.0, 64.0)); rasterizer.drawcubic(point(0.0, 64.0), point(0.0, 110.5), point(16.0, 128.0), point(56.5, 128.0)); rasterizer.drawcubic(point(56.5, 128.0), point(66.0, 128.0), point(79.5, 127.0), point(90.0, 125.0)); rasterizer.drawcubic(point(90.0, 125.0), point(78.75, 135.25), point(73.25, 144.5), point(70.75, 152.0)); rasterizer.drawcubic(point(70.75, 152.0), point(64.5, 169.0), point(75.5, 183.0), point(105.0, 170.5)); rasterizer.drawline(point(105.0, 170.5), point(103.0, 163.5)); rasterizer.drawcubic(point(55.0, 14.5), point(78.5, 14.5), point(88.5, 21.75), point(88.75, 38.75)); rasterizer.drawcubic(point(88.75, 38.75), point(89.0, 50.75), point(85.75, 59.75), point(73.5, 59.75)); rasterizer.drawline(point(73.5, 59.75), point(16.5, 59.75)); rasterizer.drawcubic(point(16.5, 59.75), point(17.25, 25.5), point(27.0, 14.5), point(55.0, 14.5)); rasterizer.draw_line(point(55.0, 14.5), point(55.0, 14.5));

// iterate over the resultant pixel alphas, e.g. save pixel to a buffer rasterizer.foreachpixel(|index, alpha| { // ... }); ```

Rendering the resultant pixel alphas as 8-bit grey produces:

no_std

no_std environments are supported using alloc & libm. toml ab_glyph_rasterizer = { default-features = false, features = ["libm"] }