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