Font::TTF::GDEF

Section: User Contributed Perl Documentation (3)
Updated: 2019-07-26
Page Index
 

NAME

Font::TTF::GDEF - Opentype GDEF table support  

DESCRIPTION

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...  

INSTANCE VARIABLES

There are up to 5 tables in the GDEF table, each with their own structure:
GLYPH
This is an Font::TTF::Coverage Class Definition table containing information as to what type each glyph is.
ATTACH
The attach table consists of a coverage table and then attachment points for each glyph in the coverage table:
COVERAGE
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
COVERAGE
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 before output
VAL
The value which has meaning according to FMT
DEVICE
For FMT = 3, a device table is also referenced which is stored here
MARKS
This class definition table defines the classes of mark glyphs that can be selected for processing using the MarkAttachmentType field of lookup FLAG words.
MARKSETS
Contains an array of coverage tables indexed by the FILTER value of a lookup.
 

METHODS

 

$t->read

Reads the table into the data structure  

$t->out($fh)

Writes out this table.  

$t->minsize()

Returns the minimum size this table can be. If it is smaller than this, then the table must be bad and should be deleted or whatever.  

$t->update

Sort COVERAGE tables.  

AUTHOR

Martin Hosken <http://scripts.sil.org/FontUtils>.  

LICENSING

Copyright (c) 1998-2016, SIL International (http://www.sil.org)

This module is released under the terms of the Artistic License 2.0. For details, see the full text of the license in the file LICENSE.


 

Index

NAME
DESCRIPTION
INSTANCE VARIABLES
METHODS
$t->read
$t->out($fh)
$t->minsize()
$t->update
AUTHOR
LICENSING
LinuxReviews : manual page archive : man3pm