CentOS 7.0 - man page for font::ttf::gdef (centos section 3)
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Font::TTF::GDEF(3) User Contributed Perl Documentation Font::TTF::GDEF(3)
Font::TTF::GDEF - Opentype GDEF table support
The GDEF table contains various global lists of information which are apparantly used in
other places in an OpenType renderer. But precisely where is open to speculation...
There are up to 5 tables in the GDEF table, each with their own structure:
This is an Font::TTF::Coverage Class Definition table containing information as to
what type each glyph is.
The attach table consists of a coverage table and then attachment points for each
glyph in the coverage table:
This is a coverage table
POINTS This is an array of point elements. Each element is an array of curve points
corresponding to the attachment points on that glyph. The order of the curve
points in the array corresponds to the attachment point number specified in
the MARKS coverage table (see below).
LIG This contains the ligature caret positioning information for ligature glyphs
A coverage table to say which glyphs are ligatures
LIGS An array of elements for each ligature. Each element is an array of
information for each caret position in the ligature (there being number of
components - 1 of these, generally)
FMT This is the format of the information and is important to provide
the semantics for the value. This value must be set correctly
VAL The value which has meaning according to FMT
DEVICE For FMT = 3, a device table is also referenced which is stored
This class definition table defines the classes of mark glyphs that can be selected
for processing using the MarkAttachmentType field of lookup FLAG words.
Contains an array of coverage tables indexed by the FILTER value of a lookup.
Reads the table into the data structure
Writes out this table.
Sort COVERAGE tables.
perl v5.16.3 2012-08-08 Font::TTF::GDEF(3)
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