209 lines
9.0 KiB
Plaintext
209 lines
9.0 KiB
Plaintext
This file contains a list of various font formats. It gives the
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reference document and whether it is supported in FreeType 2.
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Table fields
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------------
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wrapper format
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The format used to represent the font data. In the table below it
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is used only if the font format differs. Possible values are
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SFNT binary
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PFB binary
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PS a text header, followed by binary or text data
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LZW compressed with either `gzip' or `compress'
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BZ2 compressed with `bzip2'.
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font format
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How the font is to be accessed, possibly after converting the file
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type and wrapper format into a generic form. Bitmap formats are
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`BDF', `PCF', and one form of `WINFNT'; all others are vector
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formats. `PS' indicates third-order, `TT' second-order Bézier
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curves.
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font type
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Sub-formats of the font format. `SBIT' and `MACSBIT' are bitmap
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formats, `MM' and `VAR' support optical axes. `CFF2' supports
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optical axes also.
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glyph access
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If not specified, the glyph access is `standard' to the font
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format. Values are `CID' for CID-keyed fonts, `SYNTHETIC' for
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fonts that are modified versions of other fonts by means of a
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transformation matrix, and `TYPE_0' for PS fonts which are to be
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accessed in a tree-like structure.
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FreeType driver
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The module in the FreeType library which handles the specific font
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format. A missing entry means that FreeType doesn't support the
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font format (yet).
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Notes
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-----
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The SFNT container format also provides `collections' (usually
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having the file extension `.ttc' or `.otc'). A collection contains
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multiple font faces that share some tables to avoid redundancy, thus
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reducing the file size. In FreeType, elements of a collection can
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be accessed with a proper face index.
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Both the GX and the OpenType 1.8 variation fonts provide `named
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instances'. FreeType maps them to face indices (they can also be
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accessed with the standard MM interface).
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Other font formats (not using the SFNT wrapper) also provide
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multiple faces within one file; they are marked with an asterisk
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(`*') in the table below.
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FreeType can be configured to support Mac files (on older Mac OS
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versions, a `file' is stored as a data and a resource fork, this is,
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within two separate data chunks). If a file can't be opened as a
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font, FreeType then checks whether it is a resource fork, trying to
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extract the contained font data from either a `POST' or `sfnt'
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resource.
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Please send additions and/or corrections to wl@gnu.org or to the
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FreeType developer's list at freetype-devel@nongnu.org (for
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subscribers only). If you can provide a font example for a format
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which isn't supported yet please send a mail too.
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wrapper font font glyph FreeType reference
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format format type access driver documents
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-----------------------------------------------------------------------------
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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 CID cid 5180.sfnt.pdf (for the Mac)
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[3]
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SFNT PS CFF --- cff OT spec, 5176.CFF.pdf
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(`OTTO' format)
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SFNT PS CFF CID cff OT spec, 5176.CFF.pdf
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SFNT PS CFF SYNTHETIC --- OT spec, 5176.CFF.pdf
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SFNT PS CFF2 --- cff OT spec 1.8
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SFNT TT SBIT --- sfnt XFree86 (bitmaps only;
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with `head' table)
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SFNT TT MACSBIT --- sfnt OT spec (for the Mac;
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bitmaps only; `bhed' table)
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SFNT TT --- --- truetype OT spec (`normal' TT font)
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SFNT TT VAR --- truetype GX spec (`?var' tables)
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SFNT TT VAR --- truetype OT spec 1.8
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(`?var' + `?VAR' tables)
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--- PS TYPE_1 --- type1 T1_SPEC.pdf
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(PFA, Type 1 font resource)
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PFB PS TYPE_1 --- type1 T1_SPEC.pdf,
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5040.Download_Fonts.pdf
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(`normal' Type 1 font)
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--- PS TYPE_1 CID cid PLRM.pdf (CID Font Type 0;
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Type 9 font)
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--- PS MM --- type1 5015.Type1_Supp.pdf
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(Multiple Masters)
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--- PS CFF --- cff 5176.CFF.pdf (`pure' CFF)
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--- PS* CFF CID cff 5176.CFF.pdf (`pure' CFF)
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--- PS CFF SYNTHETIC --- 5176.CFF.pdf (`pure' CFF)
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--- PS CFF/MM --- cff old 5167.CFF.pdf (`pure' CFF)
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[3]
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--- PS* CFF/MM CID cff old 5167.CFF.pdf (`pure' CFF)
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[3]
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--- PS CFF/MM SYNTHETIC --- old 5167.CFF.pdf (`pure' CFF)
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[3]
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PS PS CFF --- --- PLRM.pdf (Type 2) [1]
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PS PS* CFF CID --- PLRM.pdf (Type 2) [1]
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PS PS CFF SYNTHETIC --- PLRM.pdf (Type 2) [1]
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PS PS CFF/MM --- --- PLRM.pdf (Type 2) [1]
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PS PS* CFF/MM CID --- PLRM.pdf (Type 2) [1]
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PS PS CFF/MM SYNTHETIC --- PLRM.pdf (Type 2) [1]
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--- PS --- TYPE_0 --- PLRM.pdf
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--- PS TYPE_3 --- --- PLRM.pdf (never supported)
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--- PS TYPE_3 CID --- PLRM.pdf (CID Font Type 1;
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Type 10 font; never supported)
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PS PS TYPE_14 --- --- PLRM.pdf (Chameleon font;
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Type 14 font; never supported?)
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--- PS TYPE_32 CID --- PLRM.pdf (CID Font Type 4;
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Type 32 font; never supported?)
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PS TT --- --- type42 5012.Type42_Spec.pdf
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(Type 42 font)
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PS TT --- CID --- PLRM.pdf (CID Font Type 2;
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Type 11 font)
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? ? CEF ? cff ?
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--- PCF --- --- pcf X11 [4]
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LZW PCF --- --- pcf X11 [4]
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BZ2 PCF --- --- pcf X11 [4]
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--- PFR* PFR0 --- pfr [2]
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--- PFR PFR1 --- --- (undocumented, proprietary;
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probably never supported)
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--- WINFNT* --- --- winfonts Windows developer's notes [5]
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--- WINFNT VECTOR --- --- Windows developer's notes [5]
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[1] Support should be rather simple since this is identical to `CFF'
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but in a PS wrapper.
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[2] The official PFR specification is no longer available, but
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archive.org has archived it:
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https://web.archive.org/web/20091014062300/http://www.bitstream.com/font_rendering/products/truedoc/pfrspec.html
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https://web.archive.org/web/20081115152605/http://www.bitstream.com/font_rendering/pdfs/pfrspec1.3.pdf
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The syntax of the auxiliary data is not defined there, but is
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partially defined in MHP 1.0.3 (also called ETSI TS 101812 V1.3.1)
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section 7.4.
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https://www.etsi.org/
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https://webapp.etsi.org/workprogram/Report_WorkItem.asp?WKI_ID=18799
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[3] Support is rudimentary currently; some tables or data are not
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loaded yet.
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[4] See
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THE X WINDOW SYSTEM SERVER: X VERSION 11, RELEASE 5
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Elias Israel, Erik Fortune, Digital Press, 1992
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ISBN 1-55558-096-3
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for a specification given in Appendix D on pgs. 436-450. However,
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this information might be out of date; unfortunately, there is no
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PCF specification available online, and this book is out of print.
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George Williams deduced the font format from the X11 sources and
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documented it for his FontForge font editor:
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https://fontforge.github.io/pcf-format.html
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[5] This is from MS Windows 3; see Microsoft's Knowledge Base article at
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https://support.microsoft.com/kb/65123
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------------------------------------------------------------------------
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Copyright (C) 2004-2021 by
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David Turner, Robert Wilhelm, and Werner Lemberg.
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This file is part of the FreeType project, and may only be used,
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modified, and distributed under the terms of the FreeType project
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license, LICENSE.TXT. By continuing to use, modify, or distribute this
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file you indicate that you have read the license and understand and
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accept it fully.
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--- end of formats.txt ---
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Local Variables:
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coding: utf-8
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End:
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