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OpenType specification change log
Version 1.0 - released April, 1997
Version 1.01 - released October, 1997
Summary of Changes:
- mmfx.htm, fvar.htm, mmsd.htm, otover.htm, recom.htm - edits throughout
- loca.htm - changed long-aligned to word-aligned for local offsets
- wgl4.htm - added reference to Euro symbol
- dsig.htm - added note about system use of dsig table to distinguish OT from TT fonts
- ttoreg.htm - added VIT, TRK, and ROM lang sys tags
- tablist.htm/otff.htm - rearranged table list
- base.htm - change to basecoordformat3 data type
- gpos.htm - pairposformat1 subtable valuerecord becomes offset
- kern.htm - gpos clarification
- name.htm - added name id's 13 and 14
- ltsh.htm - clarified option for fixed-pitch fonts
- vdmx.htm - version 1 added to vdmx table
- os2.htm - added codepage range 8 for Vietnamese; added new vendor id's, including UNKN
Version 1.1 - released April, 1998
Summary of Changes:
- CFF and Type2 specs updated
- chapter2.htm - corrected typo in figure 2d (fig2d.gif)
- dsig.htm - added info about location of DSIG table; added list of sfnt structural requirements
- feattags.htm - created more comprehensive list and description of layout feature tags
- gpos.htm - corrected illustration 4f (fig4f.gif)
- head.htm - added bit 12 (converted) to flags field
- hhea.htm - removed CFF restriction listed in numberOfHMetrics field; added caretOffset field.
- maxp.htm - added version 0.5 table (numGlyphs field); general editing
- name.htm - added name id's 16, 17, and 18; corrected name id example
- os2.htm - added new version (2), adding new fields sxHeight, sCapHeight, usDefaultChar, usBreakChar, usMaxLookup; clarified sTypoAscender and sTypoDescender fields; changed some Unicode range values to reflect Unicode 2; updated registered vendors
- otff.htm - general editing; added description of two types of TTC headers, and DSIG table location
- recom.htm - general editing
Version 1.2 - released November, 1998
Summary of Changes:
- Data type notation and spelling corrected throughout
- base.htm - added BaseCoord Table Format 4
- chapter2.htm - corrected example 3; refined description of next glyph; reserved RightToLeft lookup flag; corrected descriptions of LookupFlag bits
- cmap.htm - removed legacy encodings
- dsig.htm - updated field names and format of signature record; added step to creation of content digest
- feattags.htm - registered new features crcy, dnom, jajp, kokr, lfbd, numr, rtbd, vivn, vrt2, zhcn, zhtw; removed features trak, vrot; edited and clarified descriptions of features afrc, altv, c2sc, calt, case, cpsp, dlig, dpng, expt, fina, frac, fwid, halt, hlig, lngl, hwid, init, ital, jp78, jp90, kern, lnum, medi, mgrk, onum, opbd, ordn, ornm, palt, pnum, pwid, qwid, smcp, smpl, sups, tnam, tnum, trad, twid, vert
- gdef.htm - added MarkAttachClassDef to header, and MarkAttachmentType bit setting to LookupFlag bits; added CaretValue Table Format 4
- glyf.htm - added table detailing component record structure
- gsub.htm - added format 6, for chaining contextual substitution; general editing
- gpos.htm - added format 8, for chaining contextual positioning; clarified pair positioning operations; corrected Example 10; clarified coordinate system description; refined description of when a lookup is finished; added AnchorTable Format 4; general editing
- head.htm - added note about fontRevision field; clarified description of compression flag
- hhea.htm - corrected description of numberOfHMetrics
- mmfx.htm - corrections throughout; added MMFXIdZero
- name.htm - general editing
- os2.htm - renamed usMaxLookup to usMaxContext; edited descriptions of defaultChar and breakChar; updated registered vendors
- otff.htm - general editing; added ulDsigTag and related fields to TTC header; added datatypes LONGDATETIME; clarified checksum calculations; added tag name restrictions; clarified use of version numbers
- post.htm - renamed FormatType to Version
- vhea.htm - replaced mention of centerline with vertical baseline; corrected description of numOfLongVerMetrics
- CFF.pdf and Type2.pdf updated (December 1998)
- Several PostScript glyph names corrected in the WGL tables (18 December 1998)
this page was last updated 18 December 1998
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comments to the MST group:
ttwsite@microsoft.com
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