# TrueType and OpenType tables supported by FontForge

Apple, MS and Adobe all have their descriptions of TrueType and OpenType. MS and Adobe's versions are essentially the same, while Apple's differ significantly from either.

name | long name | FontForge's use | Apple docs | Adobe docs
--- | --- | --- | --- | ---
avar | axis variation | Used to specify piecewise linear sections of axes for distortable fonts | avar | *
BDF | X11 BDF header | This table is not part of the official TrueType or OpenType specs. It contains the header information from old bdf fonts. I describe its format here. | * | *
bdat | bitmap data | Provides the actual bitmap data for all bitmap glyphs in Apple fonts. 'EBDT' is used by MS/Adobe instead (and has the same format) | bdat | *
bhed | bitmap font header | Replaces the 'head' table in Apple's bitmap only fonts. (similar to 'head') | bhed | *
bloc | bitmap location data | Provides pointers to the appropriate bitmap data for each bitmap glyph in Apple fonts. 'EBLC' is used by MS/Adobe instead (and has the same format) | bloc | *
CFF | Compact Font Format | Provides all the outline data (and sometimes glyph names as well) for the PostScript Type2 font that is the heart of an OpenType font. Vaguely equivalent to 'glyf' , 'loca' and 'post' combined. | * | CFF

cmap

character code mapping

Provides at least one encoding from a stream of bytes to glyphs in the font. FontForge provides at least three encodings in every font (one for Mac Roman, one for Mac Unicode, one for MS Unicode). For some fonts it will additionally provide a CJK encoding (Big5, SJIS, etc) or an extended unicode encoding which will cover code points outside of the BMP.

For fonts with special 1-byte encodings (such as symbol) it will provide a "symbol" encoding which maps a known page in the corporate use area to the glyphs.

cmap

cmap

cvar | variations on cvt table | Used to specify hinting differences in distortable fonts | cvar | *
cvt | control value table | FontForge uses this when it attempts to hint truetype fonts (FontForge will read it from a font and save it into another). | cvt | cvt
EBDT | embedded bitmap data | Provides the actual bitmap data for all bitmap glyphs in MS/Adobe fonts. 'bdat' is used by Apple instead (and has the same format) | * | EBDT
EBLC | embedded bitmap location | Provides pointers to the appropriate bitmap data for each bitmap glyph in MS/Adobe fonts. 'bloc' is used by Apple instead (and has the same format) | * | EBLC
EBSC | embedded bitmap scaling | Provides information on how to scale bitmaps (on those rare occasions where this is desirable). FontForge uses it when making bitmap only fonts for windows. | EBSC | EBSC
feat | layout feature table | Maps features specified in Apple's 'morx' (or 'mort') tables into names provided in the 'name' table. FontForge generates this when it generates a 'morx' table. | feat | *
FFTM | FontForge timestamp | This table is unique to FontForge. It contains three timestamps: First FontForge's version date, then when the font was generated, and when the font was created. I describe its format here. | * | *
fpgm | font program | FontForge never generates this, but it will preserve it and allows users to edit it. | fpgm | fpgm
fvar | font variations | Provides top level information about distortable fonts. Specifies the types of distortions possible. | fvar | *
gasp | grid-fitting and scan conversion | When FontForge does not attempt to hint a truetype font it will generate this table which tells the rasterizer not to to do grid-fitting (hinting) but to do anti-aliasing instead. | gasp | gasp
GDEF | glyph definition | Divides glyphs into various classes that make using the GPOS/GSUB tables easier. Also provides internal caret positions for ligatures. It is approximately equivalent to Apple's 'prop' and 'lcar' tables combined. | * | GDEF
glyf | glyph outline | Provides outline information for truetype glyphs. Vaguely equivalent to 'CFF '. | glyf | glyf
GPOS | glyph positioning | Provides kerning information, mark-to-base, etc. for opentype fonts. See the chapter on GPOS in FontForge for more information. Vaguely equivalent to 'kern' and 'opbd' tables. | * | GPOS
GSUB | glyph substitution | Provides ligature information, swash, etc. for opentype fonts. See the chapter on GSUB in FontForge for more information. Vaguely equivalent to 'morx'. | * | GSUB
gvar | glyph variations | This table contains the meat of a distortable font. It specifies how each glyph can be distorted. | gvar | *
head | font header | Contains general font information, such as the size of the em-square, a time stamp, check sum infomation, etc. | head | head
hhea | horizontal header | This table contains font-wide horizontal metric information. | hhea | hhea
hmtx | horizontal metrics | This contains the per-glyph horizontal metrics. | hmtx | hmtx
kern | kerning | Provides kerning information for Apple's truetype fonts (and for older MS truetype fonts). In OpenType fonts this information is contained in the GPOS table. | kern | kern
lcar | ligature caret | This table provides the location of carets within ligatures in an Apple font. This information is contained in the GDEF table in opentype fonts. | lcar | *
loca | glyph location | This provides a pointer into the 'glyf' table for each glyph in the font. It is required for truetype and meaningless for opentype (where vaguely equivalent information is provided in the CFF table). | loca | loca
MATH | mathematical typesetting | Provides general information needed for mathematical typesetting. This is a new table (August 2007) and there is currently no publicly available documentation for it. | * | *
maxp | maximum profile | Provides general "maximum" information about the font. This contains: the maximum number of glyphs in a font, the maximum number of points in a glyph, the maximum number of references in a glyph, etc. | maxp | maxp
mort | metamorphosis | FontForge will read this table but not generate it. This table has been replaced by the 'morx' table which will be generated instead. It is vaguely equivalent to the GSUB table. | mort | *
morx | extended metamorphosis | Provides ligature information, swash, etc. for apple's truetype fonts. FontForge can read and write this table. See the chapter on morx in FontForge for more information. Vaguely equivalent to 'GSUB'. | morx | *
name | name | Provides certain standard strings relevant to the font (font name, family name, license, etc.) in various languages. In Apple fonts also provides the names of various features of the 'morx'/'mort' table. | name | name
opbd | optical bounds | This table provides optical bound information for each glyph in the table in an Apple font. This information may also be provided in the GPOS table of an opentype font. | opbd | *
PfEd | FontForge's personal table | This table is unique to FontForge. It can contain things like FontForge's comments, and colors.I describe its format here. | * | *
post | glyph name and postscript compatibility | This table provides some additional postscript information (italic angle), but mostly it provides names for all glyphs. | post | post
prep | cvt program | FontForge never generatest this table itself, but it will retain it when reading other fonts, and it allows users to edit it. | prep | prep
prop | glyph properties | Provides the unicode properties of each glyph for an Apple font. This table bears some similarities to the GDEF table. | prop | *
TeX | TeX information | This table is unique to FontForge and is for use by TeX. I describe its format here. | * | *
vhea | vertical header | FontForge generates this table for fonts with vertical metrics. This table contains font-wide vertical metric information. | vhea | vhea
vmtx | vertical metrics | FontForge generates this table for fonts with vertical metrics. This contains the per-glyph vertical metrics. | vmtx | vmtx
VORG | Vertical origin | Specifies the vertical origin of the baseline of sub-fonts of a CID keyed opentype font. | * | VORG

Advanced Typography tables in FontForge