[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
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@ -77,8 +77,8 @@ which isn't supported yet please send a mail too.
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--- BDF --- --- bdf 5005.BDF_Spec.pdf, X11
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SFNT PS TYPE_1 --- type1 Type 1 GX Font Format
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(for the Mac) [3]
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SFNT PS TYPE_1 --- type1 Type 1 GX Font Format [7]
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(for the Mac; not supported)
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SFNT PS TYPE_1 CID cid 5180.sfnt.pdf (for the Mac) [3]
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SFNT PS CFF --- cff OT spec, 5176.CFF.pdf
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(`OTTO' format)
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@ -198,6 +198,12 @@ which isn't supported yet please send a mail too.
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[6] Supported font formats are TrueType and OpenType fonts as
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defined in the OpenType specification 1.6 and newer.
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[7] `The Type 1 GX Font Format' (dated 1995-09-27) was distributed in
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Apple Developer CD-ROM in those days. The content of `TYP1' table
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is a PostScript Type 1 font without the eexec encryption. Current
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versions of FreeType don't not support this format, but FontForge
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can load it.
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------------------------------------------------------------------------
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Copyright (C) 2004-2023 by
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