December 2008
Intermediate to advanced
912 pages
33h 22m
English
Content preview from CJKV Information Processing, 2nd Edition
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Chapter 6: Font Formats, Glyph Sets, and Font Tools
sfnt-wrapped CIDFonts—a legacy font format
A past twist to CID-keyed font technology was referred to as sfnt-wrapped CIDFonts.
Font geeks and nerds alike are fully aware that TrueType fonts, at least those for Mac OS,
resided within what is known as an ‘sfnt’ (scalable font) resource. But, weren’t CID-keyed
fonts the best thing since sliced bread? Well, sure they were, but….
CID-keyed font technology provides an extremely exible mechanism for supporting
large character sets and multiple encodings, but lacks host-based support such as user-
selected and context-sensitive glyph substitution, alternate metrics (such as half-width
symbols and punctuation, proportional kana, and even proportional ideographs), and
easy vertical substitution. ese types of advanced typographic features will be covered in
greater detail when we get to Chapter 7.
An sfnt-wrapped CIDFont looks, smells, and behaves as though it were a TrueType—
actually, AAT/QuickDraw GX—font, but instead of using TrueType outlines for its glyphs
in the ‘glyf’ table, there is a CIDFont resource there instead in the ‘CID’ table that was
established by Adobe Systems. Basically, the CIDFont le itself becomes one of the many
tables within the ‘sfnt’ resource. Table 6-14 lists the additional ‘sfnt’ tables that are present
in an sfnt-wrapped CIDFont.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.