OpenType Feature Format

Michael Jarboe
Posts: 265
I was looking closer at an OpenType 'zero' feature for the slashed zero replacement and realized it was written out using each grouping bracketed rather than having each separate grouping designated as a class.
Written like
I was just curious about this as it all gets decompiled so is it simply a case of the feature being easy enough to write out vs. using classes?
Written like
sub [zero zero.op zero.lt] by [slashzero slashzero.op zeroslash.lt]as opposed to
sub @zero1 by @zero2
I was just curious about this as it all gets decompiled so is it simply a case of the feature being easy enough to write out vs. using classes?
0
Comments
-
Yes, they're the same. Probably just a short enough list that someone didn't want to write a class.2
-
Both lines are using classes, the first are just unnamed classes. But anyway it is just syntactic sugar, substitution lookups does not use classes, so both are the same as:
sub zero by slashzero;
sub zero.op by slashzero.op;
sub zero.lt by zeroslash.lt;2 -
The good thing about creating classes is that you can use it in different lookups, without having to write the groups down more than once. If you are just going to use that group just once then you don't need a class.2
Categories
- All Categories
- 44 Introductions
- 3.8K Typeface Design
- 816 Font Technology
- 1.1K Technique and Theory
- 635 Type Business
- 450 Type Design Critiques
- 549 Type Design Software
- 30 Punchcutting
- 139 Lettering and Calligraphy
- 86 Technique and Theory
- 53 Lettering Critiques
- 500 Typography
- 309 History of Typography
- 117 Education
- 74 Resources
- 518 Announcements
- 83 Events
- 107 Job Postings
- 159 Type Releases
- 168 Miscellaneous News
- 271 About TypeDrawers
- 53 TypeDrawers Announcements
- 117 Suggestions and Bug Reports