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.
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)
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.
macOS and Linux:
The buildFont.sh script first builds the OpenType-CFF2 font with the FDK tools
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
fontmake is used for building the variable TrueType font.
sfntedit is used for copying/replacing several tables between the
OTF and TTF fonts.