A selector of 2 means that they are to be turned on and a selector of 3 forces them to be off. The even number indicates that the selector is on, and the odd number that it is explicitly off.įor example, the ligature feature has selectors for common ligatures. Thus, it is possible to have both common and rare ligatures turned on, whereas it is impossible to display a given fraction as simultaneously vertical and diagonal.įor nonexclusive features, selectors come in pairs consisting of an even number (0, 2, 4,…) and the odd number following it (1, 3, 5,…).

(Selectors are often called “settings.”) The feature code indicates a general class of effect (e.g., ligatures) and the selector code the specific effect (e.g., rare ligatures).įeatures are classified as 'exclusive' and 'nonexclusive.' This indicates whether several different selectors within a given feature type may be selected at once. Typographic effects are achieved in AAT through the use of two sixteen-bit numbers called a feature and selector. You can submit new features to the Registry here. This is a dynamic list - the AAT architecture allows new kinds of features to be defined without requiring a revision to either the application or the system software itself. It describes these features from several points of view, including that of the font designer, the user, and the application developer. This document describes the set of currently defined typographic and layout features available from applications using CoreText.

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