Sub-pixel Distance Transform

The Sub-pixel Distance Transform (ESDT) is a technique for rendering fonts accurately using Signed Distance Fields (SDFs). It provides subpixel accuracy and solves issues with traditional Euclidean Distance Transforms (EDTs). The ESDT algorithm involves calculating subpixel offsets for gray pixels and propagating distances to nearby pixels. It also addresses the problem of blending colors at the edges of glyphs. The ESDT implementation provides high-quality font rendering at different font sizes and scales.