Re: TrueType and glyph substitution [was: dotless j]

From: Deborah Goldsmith (
Date: Fri Aug 06 1999 - 17:20:29 EDT

> OpenType defines a number of new
> data structures that may (optionally) be included into TrueType fonts,
> in order to allow for complex mappings between sequences of character
> codes and sequences of glyphs. This includes glyph variants
> (language-dependent, contextual, and user-selected), as well as a host
> of other features.

In the spirit of equal-opportunity advertisements, I must mention that there
are a set of extensions to the original TrueType format called Apple
Advanced Typography, which have been around for several years. They were
originally used by QuickDraw GX, and are now used by Apple's Unicode imaging
solution, ATSUI (Apple Type Services for Unicode Imaging). ATSUI has been
part of Mac OS since version 8.5, and is also part of Apple's Carbon API.

> More information on OpenType (including the font format specification)
> is available from

Information on Apple's language and typographic support can be found at:


Deborah Goldsmith
Manager, International Toolbox Group
Apple Computer, Inc.

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