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[doc] Type1 GX (sfnt-wrapped Type1) is not supported. 

* docs/formats.txt: Clarify the reference of Type1 GX,
and state that this format is not supported.  This
is because the content `TYP1' table is not exactly same
with the Type1 font format specification; no eexec
encryption is used.  For detail and concrete examples,
see the analysis on:

https://gitlab.freedesktop.org/freetype/freetype/-/issues/1231
This commit is contained in:
suzuki toshiya 2023-05-20 12:52:25 +00:00
parent 2342a03a9d
commit 562f348192
1 changed files with 8 additions and 2 deletions
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docs/formats.txt
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@ -77,8 +77,8 @@ which isn't supported yet please send a mail too.
--- BDF --- --- bdf 5005.BDF_Spec.pdf, X11
SFNT PS TYPE_1 --- type1 Type 1 GX Font Format
(for the Mac) [3]
SFNT PS TYPE_1 --- type1 Type 1 GX Font Format [7]
(for the Mac; not supported)
SFNT PS TYPE_1 CID cid 5180.sfnt.pdf (for the Mac) [3]
SFNT PS CFF --- cff OT spec, 5176.CFF.pdf
(`OTTO' format)
@ -198,6 +198,12 @@ which isn't supported yet please send a mail too.
[6] Supported font formats are TrueType and OpenType fonts as
defined in the OpenType specification 1.6 and newer.
[7] `The Type 1 GX Font Format' (dated 1995-09-27) was distributed in
Apple Developer CD-ROM in those days. The content of `TYP1' table
is a PostScript Type 1 font without the eexec encryption. Current
versions of FreeType don't not support this format, but FontForge
can load it.
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