svgs2ttf

Description

A quick & dirty FontForge + Python script to generate fonts from a directory of SVG files (or other outline formats importable by FontForge) and some JSON metadata.

Not to be confused with svg2ttf. Users with more sophisticated needs probably want Font Custom, grunt-webfont, or IcoMoon.

Dependencies

FontForge (A version with python. Developed on 20140101)
Python >= 2.6 or 3

Usage

$ svgs2ttf metadata.json

Example metadata.json:

{ "props":
  { "ascent": 800
  , "descent": 200
  , "em": 1000
  , "family": "Example"
  }
, "input": "src"
, "output": [ "example.ttf" ]
, "glyphs":
  { "0x41": { "src": "a.svg" }
  , "0x42": { "src": "b.svg" }
  , "67": "c.svg"
  }
}

props holds three kinds of font properties:
- Shortcuts: family and style (name your font), and lang (default language for entries in the sfnt name table).
- Any properties of fontforge.font; get attached to the font object as an attribute. The lengths ascent, descent, and em are probably useful to set.
- Everything else gets added to the sfnt name table.
input, if specified, is the directory where images are found. (default: '.') All paths are relative to the JSON file.
output is an array of output filenames. FontForge guesses the type from the extension. Supported types are listed in FontForge's menu and include SVG, TTF, and WOFF. (EOT currently requires a 3rd-party converter, e.g. ttf2eot.)
glyphs is a mapping whose keys are integer codepoints (as strings in base 2, 8, 10, or 16).
- Values are filenames or dictionaries with the filename in src.
- Other dictionary entries become attributes of the glyph object. See supported attributes. Useful ones may include altuni, comments, width, and vwidth.
- If a filename is not provided (value is an empty string or a dict without the src key), then (codepoint).svg is guessed.
sfnt_names, if specified, lists entries to add directly to the sfnt name table.

See examples/example.json for an example that specifies more options. Some customizations might be best done by editing the script. (See the FontForge python reference.)

Input file restrictions

The JSON must be valid JSON. The format is fairly unforgiving of misplaced commas and single quotes, though if you want to write comments you can interpose yajl's json_reformat like so:
```
$ svgs2ttf <(json_reformat < with_comments.json)
```
It's better if the input pictures are just plain filled paths. FontForge tries to do the right thing for stroked paths and unions of overlapping regions, but support for clipping is missing (fontforge#1276), and some interactions between stroke expansion and overlap removal (e.g. fontforge#1374) were only recently corrected.