Schrift

Schrift is a font library that reads true type fonts and creates subset fonts containing only the needed characters. It is released under the MIT license.

Getting Started

• Download Schrift and include the library into your project:

  include("schrift/schrift.php");

• Run the code to create a font subset:

  $font = new Schrift("GentiumPlus-R.ttf");
  $data = $font->subset("Hello τυπογραφία!");

  The font subset in $data is a valid true type file and contains only the given characters.

  If you want to know which characters are supported by this font file:

  $chars = $font->supported_chars();
  print $chars;

  This will return an utf-8 encoded string. Additionally if you need integer character codes you can use supported_charcodes().

  You can enable debugging output by overwriting the default options:

  $options = array("debug" => true);
  $font = new Schrift("GentiumPlus-R.ttf", $options);

The Font Subset

At the moment the font subset contains the following information:

• cmap table - character to glyph mappings
• glyf table - simple and compound glyphs
• head table - global font information
• hhea table - horizontal font information
• hmtx table - horizontal metric information
• loca table - locations of the glyphs
• maxp table - memory requirements
• name table - human-readable names
• post table - postscript names

The head, hmtx and name tables are unmodified copies of the original font. The post table at this time contains no information.