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DEFOMA stands for DEbian FOnt MAnager.
Whenever a font is installed or removed, every application that
depends on or makes use of or anyway has something to do with the font
has to be configured about the font. Such a process should be
automated, but in fact only a few applications automate it. It means
that each user or a system administrator needs to configure most of
applications manually about fonts, to make use of fonts from the
applications. This is really waste of time and requires knowledge to
some degree.
Defoma can do configuration about fonts automatically in place of
a system administrator. In fact Defoma just provides a framework
of automatic configuration about fonts. Its rough flow is, a font gets
registered to Defoma with its category and hints, then a configuration
script of each application gets called. The script is needed to be
provided for each category by an application.
PostScript fonts are more problematic, because what PS fonts are
available for printing are completely unknown to applications.
Applications that output PostScript file (like tgif and abiword) may
provide a menu for choosing PS fonts. Ideally such a menu contains
all of the printable PS fonts, but actually only well-known and
general PS fonts are included. For PS Printer users, Defoma provides
a nice interface to register PS printer fonts
(called defoma-psfont-installer), and for users who print PS files by
using a PS renderer (like ghostscript), the renderer registers PS fonts
as printable. These mechanisms cause such applications to have enough
information for the menu.
In addition, these PS fonts are registered with their hints, which is
very useful for font substitution. If a PS previewer cannot provide
all the printable PS fonts, previewable PS fonts should substitute for
lacking printable PS fonts. Hints help to decide which font is the best
(that is, the most similar) to substitute for each of the lacking fonts.
This substituting mechanism is another feature of Defoma.
-- Yasuhiro Take <take@debian.org>, Sat, 2 Dec 2000 00:14:21 +0900
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