1 This file contains a list of various font formats. It gives the 2 reference document and whether it is supported in FreeType 2. 3 4 Table fields 5 ------------ 6 7 wrapper format 8 The format used to represent the font data. In the table below it 9 is used only if the font format differs. Possible values are 10 11 SFNT binary 12 PFB binary 13 PS a text header, followed by binary or text data 14 LZW compressed with either `gzip' or `compress' 15 BZ2 compressed with `bzip2'. 16 17 font format 18 How the font is to be accessed, possibly after converting the file 19 type and wrapper format into a generic form. Bitmap formats are 20 `BDF', `PCF', and one form of `WINFNT'; all others are vector 21 formats. `PS' indicates third-order, `TT' second-order Bzier 22 curves. 23 24 font type 25 Sub-formats of the font format. `SBIT' and `MACSBIT' are bitmap 26 formats, `MM' and `VAR' support optical axes. `CFF2' supports 27 optical axes also. 28 29 glyph access 30 If not specified, the glyph access is `standard' to the font 31 format. Values are `CID' for CID-keyed fonts, `SYNTHETIC' for 32 fonts that are modified versions of other fonts by means of a 33 transformation matrix, and `TYPE_0' for PS fonts which are to be 34 accessed in a tree-like structure. 35 36 FreeType driver 37 The module in the FreeType library which handles the specific font 38 format. A missing entry means that FreeType doesn't support the 39 font format (yet). 40 41 42 Notes 43 ----- 44 45 The SFNT container format also provides `collections' (usually 46 having the file extension `.ttc' or `.otc'). A collection contains 47 multiple font faces that share some tables to avoid redundancy, thus 48 reducing the file size. In FreeType, elements of a collection can 49 be accessed with a proper face index. 50 51 Both the GX and the OpenType 1.8 variation fonts provide `named 52 instances'. FreeType maps them to face indices (they can also be 53 accessed with the standard MM interface). 54 55 Other font formats (not using the SFNT wrapper) also provide 56 multiple faces within one file; they are marked with an asterisk 57 (`*') in the table below. 58 59 FreeType can be configured to support Mac files (on older Mac OS 60 versions, a `file' is stored as a data and a resource fork, this is, 61 within two separate data chunks). If a file can't be opened as a 62 font, FreeType then checks whether it is a resource fork, trying to 63 extract the contained font data from either a `POST' or `sfnt' 64 resource. 65 66 67 Please send additions and/or corrections to wl (a] gnu.org or to the 68 FreeType developer's list at freetype-devel (a] nongnu.org (for 69 subscribers only). If you can provide a font example for a format 70 which isn't supported yet please send a mail too. 71 72 73 wrapper font font glyph FreeType reference 74 format format type access driver documents 75 ----------------------------------------------------------------------------- 76 77 --- BDF --- --- bdf 5005.BDF_Spec.pdf, X11 78 79 80 SFNT PS TYPE_1 --- type1 Type 1 GX Font Format 81 (for the Mac) [3] 82 SFNT PS TYPE_1 CID cid 5180.sfnt.pdf (for the Mac) 83 [3] 84 SFNT PS CFF --- cff OT spec, 5176.CFF.pdf 85 (`OTTO' format) 86 SFNT PS CFF CID cff OT spec, 5176.CFF.pdf 87 SFNT PS CFF SYNTHETIC --- OT spec, 5176.CFF.pdf 88 SFNT PS CFF2 --- cff OT spec 1.8 89 90 SFNT TT SBIT --- sfnt XFree86 (bitmaps only; 91 with `head' table) 92 SFNT TT MACSBIT --- sfnt OT spec (for the Mac; 93 bitmaps only; `bhed' table) 94 SFNT TT --- --- truetype OT spec (`normal' TT font) 95 SFNT TT VAR --- truetype GX spec (`?var' tables) 96 SFNT TT VAR --- truetype OT spec 1.8 97 (`?var' + `?VAR' tables) 98 99 100 --- PS TYPE_1 --- type1 T1_SPEC.pdf 101 (PFA, Type 1 font resource) 102 PFB PS TYPE_1 --- type1 T1_SPEC.pdf, 103 5040.Download_Fonts.pdf 104 (`normal' Type 1 font) 105 --- PS TYPE_1 CID cid PLRM.pdf (CID Font Type 0; 106 Type 9 font) 107 --- PS MM --- type1 5015.Type1_Supp.pdf 108 (Multiple Masters) 109 --- PS CFF --- cff 5176.CFF.pdf (`pure' CFF) 110 --- PS* CFF CID cff 5176.CFF.pdf (`pure' CFF) 111 --- PS CFF SYNTHETIC --- 5176.CFF.pdf (`pure' CFF) 112 --- PS CFF/MM --- cff old 5167.CFF.pdf (`pure' CFF) 113 [3] 114 --- PS* CFF/MM CID cff old 5167.CFF.pdf (`pure' CFF) 115 [3] 116 --- PS CFF/MM SYNTHETIC --- old 5167.CFF.pdf (`pure' CFF) 117 [3] 118 PS PS CFF --- --- PLRM.pdf (Type 2) [1] 119 PS PS* CFF CID --- PLRM.pdf (Type 2) [1] 120 PS PS CFF SYNTHETIC --- PLRM.pdf (Type 2) [1] 121 PS PS CFF/MM --- --- PLRM.pdf (Type 2) [1] 122 PS PS* CFF/MM CID --- PLRM.pdf (Type 2) [1] 123 PS PS CFF/MM SYNTHETIC --- PLRM.pdf (Type 2) [1] 124 --- PS --- TYPE_0 --- PLRM.pdf 125 --- PS TYPE_3 --- --- PLRM.pdf (never supported) 126 --- PS TYPE_3 CID --- PLRM.pdf (CID Font Type 1; 127 Type 10 font; never supported) 128 PS PS TYPE_14 --- --- PLRM.pdf (Chameleon font; 129 Type 14 font; never supported?) 130 --- PS TYPE_32 CID --- PLRM.pdf (CID Font Type 4; 131 Type 32 font; never supported?) 132 PS TT --- --- type42 5012.Type42_Spec.pdf 133 (Type 42 font) 134 PS TT --- CID --- PLRM.pdf (CID Font Type 2; 135 Type 11 font) 136 137 138 ? ? CEF ? cff ? 139 140 141 --- PCF --- --- pcf X11 [4] 142 LZW PCF --- --- pcf X11 [4] 143 BZ2 PCF --- --- pcf X11 [4] 144 145 146 --- PFR* PFR0 --- pfr [2] 147 --- PFR PFR1 --- --- (undocumented, proprietary; 148 probably never supported) 149 150 151 --- WINFNT* --- --- winfonts Windows developer's notes [5] 152 --- WINFNT VECTOR --- --- Windows developer's notes [5] 153 154 155 [1] Support should be rather simple since this is identical to `CFF' 156 but in a PS wrapper. 157 158 [2] The official PFR specification is no longer available, but 159 archive.org has archived it: 160 161 https://web.archive.org/web/20091014062300/http://www.bitstream.com/font_rendering/products/truedoc/pfrspec.html 162 https://web.archive.org/web/20081115152605/http://www.bitstream.com/font_rendering/pdfs/pfrspec1.3.pdf 163 164 The syntax of the auxiliary data is not defined there, but is 165 partially defined in MHP 1.0.3 (also called ETSI TS 101812 V1.3.1) 166 section 7.4. 167 168 http://www.etsi.org/ 169 http://webapp.etsi.org/workprogram/Report_WorkItem.asp?WKI_ID=18799 170 171 [3] Support is rudimentary currently; some tables or data are not 172 loaded yet. 173 174 [4] See 175 176 THE X WINDOW SYSTEM SERVER: X VERSION 11, RELEASE 5 177 Elias Israel, Erik Fortune, Digital Press, 1992 178 ISBN 1-55558-096-3 179 180 for a specification given in Appendix D on pgs. 436-450. However, 181 this information might be out of date; unfortunately, there is no 182 PCF specification available online, and this book is out of print. 183 George Williams deduced the font format from the X11 sources and 184 documented it for his FontForge font editor: 185 186 https://fontforge.github.io/pcf-format.html 187 188 [5] This is from MS Windows 3; see Microsoft's Knowledge Base article at 189 190 https://support.microsoft.com/kb/65123 191 192 ------------------------------------------------------------------------ 193 194 Copyright 2004-2018 by 195 David Turner, Robert Wilhelm, and Werner Lemberg. 196 197 This file is part of the FreeType project, and may only be used, 198 modified, and distributed under the terms of the FreeType project 199 license, LICENSE.TXT. By continuing to use, modify, or distribute this 200 file you indicate that you have read the license and understand and 201 accept it fully. 202 203 204 --- end of formats.txt --- 205 206 Local Variables: 207 coding: utf-8 208 End: 209
