fontsdf

Signed Distance Field (SDF) textures can be used to render text or other vector art more flexibly[1], with higher quality while using less video memory (for the texture).

[1] For example:

• It is possible to use single 64px glyph to render both 14px and 200px text.
• It is easy to add glow, outlines and such.

Example usage with image:

let font = fontsdf::Font::from_bytes(..).unwrap();

let (metrics, sdf) = font.rasterize('x', 64.0, true);
image::GrayImage::from_raw(metrics.width as _, metrics.height as _, sdf)
	.unwrap()
	.save("sdf_x.png")
	.unwrap();

Example output:

Normal

SDF

TODO:

• dual distance field (https://steamcdn-a.akamaihd.net/apps/valve/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf)