Skip to content
Variable font example in OpenType-CFF2 & TrueType formats
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
DesignSpaceNotes first version Nov 14, 2016
RomanMasters Bump version number Feb 26, 2019
FontMenuNameDB Simplify FontMenuNameDB Aug 19, 2017
GlyphOrderAndAliasDB first version Nov 14, 2016 Change file extension Apr 3, 2017 Update documentation and source files according to latest version of … Feb 26, 2019 The custom version of fontmake is no longer needed Mar 3, 2019
familyGSUB.fea Update documentation and source files according to latest version of … Feb 26, 2019
familyOS2.fea Refactor FEA files Feb 15, 2017
familyTables.fea Bump version number Feb 26, 2019
features.fea Update documentation and source files according to latest version of … Feb 26, 2019

Adobe Variable Font Prototype

Variable font in OpenType-CFF2 and TrueType formats, made from UFO sources derived from Source Serif Pro, designed by Frank Grießhammer.

The font files are intended to serve as test cases for environments and workflows that aim to support OpenType variable fonts.

The fonts are functional but have some limitations — see Current limitations. We plan to update them as the tools improve.

Font characteristics

Adobe Variable Font Prototype contains two axes — weight and contrast — five design masters, and eight named instances — Extra Light, Light, Regular, Semibold, Bold, Black, Black Medium Contrast, and Black High Contrast.

The weight axis has an intermediate master (master_1), and the design space can be thought of as having the shape of a square triangle. This is achieved by using master_0 twice, and by having master_4 along the diagonal defined by master_0 and master_3. This arrangement effectively collapses half of the original rectangular-shaped design space, concealing interpolation imperfections that would be visible otherwise. See design space notes for more details.

The font also contains transitional designs for the glyphs $ (dollar) and ¢ (cent), in which the inner-counter part of the stroke is removed, when the weight axis reaches Bold or heavier.

The font supports the Adobe Latin 2 character set, GPOS kerning, and the GSUB features listed below.

pnum (proportional figures)
tnum (tabular figures [default])
onum (old-style a.k.a. text figures)
lnum (lining figures [default])
zero (slashed zero)
case (case-sensitive forms such as parentheses, hyphen)
liga (ligatures fi fl ft)

Downloading the font files

Building the fonts from source


To build the OpenType-CFF2 version (AdobeVFPrototype.otf), you need to have installed the afdko version 2.8.6 or later.

To build the TrueType version (AdobeVFPrototype.ttf), you need to have installed fontmake version 1.9.1 or later.

Build command

macOS and Linux:




Build process

The script first builds the OpenType-CFF2 font with the FDK tools buildMasterOTFs and buildCFF2VF. The first tool generates OpenType-CFF fonts from each of the UFO masters. And the second takes the set of OTFs built in the previous step, and combines them to produce the CFF2 variable font.

The CFF2 table is then subroutinized with FDK's tx tool, and the modified table is replaced in place using FDK's sfntedit tool.

Next, fontmake is used for building the variable TrueType font.

Finally, sfntedit is used for copying/replacing several tables between the OTF and TTF fonts.

Current limitations

  • Support for the variable OTF-CFF2 flavor is not as broad as for the variable TTF flavor.
  • Neither of the fonts is hinted.
You can’t perform that action at this time.