Package com.adobe.fontengine.font.opentype

Classes to manipulate OpenType fonts.

The OpenTypeFont class represents an OpenType font. Such a font can have either TrueType or CFF outlines.

The class Container provides one useful (static) method: Container.load to create a bunch of OpenTypeFont from a stream of bytes. Most OpenType byte stream contain a single font, but TTC streams can contain multiple, usually related, fonts.

Each table in an OpenType font has a corresponding class, except for the 'loca' table which is better though of as an adjunct in the 'glyf' table. Typically, the OpenTypeFont object has one member for each table.

There are also a few utility classes, such as Tag.

Format version

OpenType uses versioning to allow for extensions to the format. In general, each table is equipped with a version number, made of a major version and a minor version (there are some tables which have only a minor version, or no version at all). The rule is that backward compatible extensions increment the minor version number, while backward incompatible extensions increment the major version number.

The classes in this package are programmed to fully handle all know format versions at the time they are written. Each class corresponding to a table specifies the format versions is fully handles. For example, the Post class specifies that it handles versions 1.0, 2.0, 2.5, and 3.0. The classes are also programmed to handle unknown version numbers, in the following way: let s(M) be the set of the supported minor version numbers for major version M; if an actual table has version Ma.ma, then

1. if s(Ma) is the empty set, or if ma is less than any of s(Ma), then the table is rejected at the time the OpenTypeFont object is created. This may or may not cause the whole font to be rejected.
2. otherwise, the table is interpreted according to minor version m which is the smallif the major version of an actual table is supported, but the actual minor version is not, then the largest If an actual font table has a major version number which is not supported at all, then the table is rejected at the time the OpenTypeFont object is created.

Interface Summary

Interface	Description
Cmap.CmapSelector	Class used to receive the list of recognized subtables in this cmap table.
Gasp.BehaviorBits
Glyf.CoordFlags
Glyf.Flags
Os2.SelectionBits

Class Summary

Class	Description
Base
Cff	Gives access to a 'CFF' table.
Cmap	Gives access to a 'cmap' table.
Cmap.MacEncodingID
Cmap.MS_EncodingID
Cmap.PlatformID	Enum classes for the various platformIDs and encodingIDs.
Cmap.UnicodeEncodingID
Cvt	Gives access to the 'cvt' table.
FetchGlyphNameTT
Fond	Gives access to the Apple 'fond' table.
FontFactory	Creates font objects for OpenType fonts
Fpgm	Gives access to the 'fpgm' table.
Gasp	Gives access to the 'gasp' table.
Gdef	Gives access to a 'GDEF' table.
Glyf	Gives access to the 'glyf' table.
GlyphNames	This class supports PostScript glyph names.
GlyphNamesResourceBuilder
Gpos	Gives access to the 'GPOS' table.
Gsub	Gives access to the 'GSUB' table.
Head	Gives access to the 'head' table.
Hhea	Gives access to the 'hhea' table.
Hmtx	Gives access to the 'hmtx' table.
Kern	Gives access to the 'kern' table.
LayoutTable	A LayoutTable is the base class for GSUB/GPOS/GDEF/BASE tables, and captures the common types: coverages, class definitions, etc.
LookupTable	A LookupTable is the base class for GSUB/GPOS tables.
LookupTableHarvester
Ltsh	Gives access to the 'LTSH' table.
Maxp	Gives access to the 'maxp' table.
Name	Gives access to the 'name' table.
Name.LanguageCodeEntry
Name.MacintoshEncodingId	This class defines constants for the Macintosh encoding ids.
Name.MacintoshLanguageCode
Name.MicrosoftEncodingId	This class defines constants for the Microsoft encoding ids.
Name.MicrosoftLCID	This class defines constants for the Microsoft language ids.
Name.PlatformId	This class defines constants for the platform ids.
Name.PredefinedNames	This class defines constants for the predefined entries in a 'name' table.
OpenTypeFont	Gives access to an OpenType font
OpticalSizeData	Represents the optical size data for an OpenType font.
Orientation
Os2	Gives access to the 'OS/2' table.
Os2.CodePage	Identifies a code page.
Os2.UnicodeRange	Identifies a Unicode range.
OTByteArray	A sequence of bytes in an OpenType font file, with methods to access the basic types.
OTSelector	Determine if a feature can be applied at some positions.
OTSelectorAtLigatureLevel
OTSelectorEverywhere
OTSelectorOnElementAttribute
OTSelectors	Common OTSelector objects.
OTSubset
PDFEncodingBuilderImpl
Post	Gives access to the 'post' table.
Prep	Gives access to the 'prep' table.
Table	Base class for an OpenType table
Tag	Tag manipulation and predefined tags.
TrueTypeGlyphBBoxCalculator
TTCompositeOutline	A TrueType composite outline.
TTCompositeOutline.TTComponent
TTInterpreter	Interprets TT programs.
TTOutline	A TrueType outline.
TTPoint	Represents a point in a TrueType outline.
TTScaler	A Scaler for OpenType fonts with TrueType outlines.
TTSimpleOutline	A TrueType simple outline.
Vhea	Gives access to the 'vhea' table.
Vmtx	Gives access to the 'vmtx' table.
Vorg	Gives access to the 'VORG' table.
ZoneHint