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reworded glyph name section

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jvr 2002-05-12 12:48:14 +00:00
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@ -99,23 +99,24 @@ than the command line programs described below.
makes the two above tools available under the Right Mouse Button. I haven't tested makes the two above tools available under the Right Mouse Button. I haven't tested
these myself, but I'm very interested in hearing about the results! these myself, but I'm very interested in hearing about the results!
<H3>Note about glyph names and TrueType GlyphID's</H3> <H3>A note about glyph names and TrueType GlyphID's</H3>
TrueType fonts use glyph indices (GlyphID's) to refer to glyphs in most places. TrueType fonts use glyph indices (GlyphID's) to refer to glyphs in most places.
While this is fine in binary form, it is really hard to work with for While this is fine in binary form, it is really hard to work with for
humans. Therefore we use names instead. humans. Therefore we use names instead.
<P>The names are derived from what is found in the 'post' table. It is <P>The glyph names are either extracted from the 'CFF ' table or the 'post' table,
possible that different glyphs use the same PS name. If this happens, we or are derived from a Unicode 'cmap' table. In the latter case the Adobe Glyph List
force the names to be unique by appending "#n" to the name (n being an is used to calculate names based on Unicode values. If all of these mthods fail,
integer number). The original PS names will still be maintained by the names are invented based on GlyphID (eg. "glyph00142").
'post' table, so even though we use a different name internally, we are
still able to write the 'post' table back in original form. If there is <P>It is possible that different glyphs use the same name. If this happens,
no proper 'post' table available, names will be derived from a Unicode we force the names to be unique by appending "#n" to the name (n being an
cmap (if available) in conjuction with the Adobe Glyph List (see fontTools/agl.py). integer number). The original names are being kept, so this has no influence
on a "round tripped" font.
<P>Because the order in which glyphs are stored inside the TT font is <P>Because the order in which glyphs are stored inside the TT font is
important, ttLib maintains an ordered list of glyph names in the font. important, we maintain an ordered list of glyph names in the font.
<H3>Feedback</H3> <H3>Feedback</H3>