Enhance text rendering in preview on low-resolution displays

[Myriad-Dreamin]

Motivation and Description

The effect of rendered text is unsatisfied, especially on low-resolution displays. This is because we put glyphs on arbitrary position, resulting bad subpixel renderings. From experience of google fonts, typst/pixglyph, and the blog, we'd better rasterize them by ourselves and put them on finite fraction positions, like N + {0, 1/3, or 2/3} px.

A picture of a section of a glyph atlas that contains “m” glyphs rasterized at different sub-pixel alignments.