For example, a 1152×2048 glyph (1792 ascent, 256 descent) can be evenly divided into a 9×16 grid with each space being 128×128. In most cases, such as when the entire glyph set is to be blocky, you probably want to fill the entire em height and glyph width with the grid. This method was adapted from Scindix’s response to the above post but doesn’t involve scaling down and back up (which may not always be an option, or work that well) and is otherwise simplified a bit (with some basic math skills required). Note: TrueType fonts, however, have a tradition that the em size should be a power of 2 (as in 8, 16, 32, etc.) which is pretty limiting when hoping for a small grid to work on. Set the em size to, basically, how tall you want your characters to be in “pixels” such as 10, 12, 18, or whatever. If starting a new font from scratch, you have the easy option of setting a very small em size (in Element > Font Info > General > Em Size) and turning on Snap-To-Integer (in File > Preferences > Editing > SnapToInt). Thus, given that a vectored grid feature will likely never appear in FontForge (presumably because fancy fonts rely more on custom guidelines than a grid), I will attempt to explain the simplest way(s) to make or fake a snap-to grid in FontForge. Furthermore, the popularity of FontStruct also indicates a demand for the simplicity of designing fonts based on a grid layout. The rising popularity of retro, 8-bit graphics seems to also be increasing demand for bitmap-like or pixelated fonts.
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