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223 lines
9.6 KiB
223 lines
9.6 KiB
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, that 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 [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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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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WOFF --- --- --- cff, Compressed SFNT, ver. 1.0 [6] |
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truetype |
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WOFF2 --- --- --- cff, Compressed SFNT, ver. 2.0 [6] |
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truetype |
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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 |
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at |
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https://support.microsoft.com/kb/65123 |
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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) 2004-2024 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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